Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[John R Pierce]

Dave wrote:
> On Thu, Jan 28, 2010 at 12:30 PM, Rudi Ahlers  > wrote:
>
>
> let's keep the question simple. WHICH filesystem would be best for
> this type of operation? SMB, NFS, or iSCSI?
>
>
>
> As someone said, these are all bad if your channel is insecure.  
>
> Actually I know nothing about iSCSI, maybe it is more robust. 

normally, iSCSI is done over dedicated SAN networks not even connected 
to your normal LAN

I suppose it can be secured but usually there's not even any 
authnetication, just targets masked by the initiators IP


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[CentOS] Browser related question

[Rajagopal Swaminathan]

Greetings,

How does one monitor if a site is being accessed using browser?

IOW, I just want to know if a user has launched a session thru Firefox.

I basically want to know if a user has tried to access the webserver
and unable to reach it and log such instances.

I am using cron and curl to seperately monitor the link.

Any clues?

Centos 5.2/Gnome/Firefox 3.0.16

Regards

Rajagopal
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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Rudi Ahlers]

On Fri, Jan 29, 2010 at 9:49 AM, Dave

> wrote:

> On Thu, Jan 28, 2010 at 12:30 PM, Rudi Ahlers wrote:
>
>>
>> let's keep the question simple. WHICH filesystem would be best for this
>> type of operation? SMB, NFS, or iSCSI?
>>
>
>
> As someone said, these are all bad if your channel is insecure.
>
> Actually I know nothing about iSCSI, maybe it is more robust.
>
> Dave
>
> ___
>

Even through an SSH tunnel?

If this is the case, what other options are available?



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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Geoff Galitz]

> The CIFS mounts can't be unmounted without a reboot, 

> so they build-up a pool of mounts to the same server which cause extra
latency

 

Is there an environmental restriction in your application or organization
for this?  Normally CIFS mounts can umounted easily in runtime.

 

At any rate... if I were in your shoes and really restricted to the options
you propose, I would go with CIFS mounts through IPSEC tunnels.   

 

-geoff

 

-
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Blankenheim NRW, Germany
  http://www.galitz.org/
  http://german-way.com/blog/

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Rudi Ahlers]

On Fri, Jan 29, 2010 at 12:12 PM, Geoff Galitz  wrote:

>  > The CIFS mounts can't be unmounted without a reboot,
>
> > so they build-up a pool of mounts to the same server which cause extra
> latency
>
>
>
> Is there an environmental restriction in your application or organization
> for this?  Normally CIFS mounts can umounted easily in runtime.
>

what do you mean by this?



>  At any rate... if I were in your shoes and really restricted to the
> options you propose, I would go with CIFS mounts through IPSEC tunnels.
>
>
>

Wouldn't IPSEC add more  overhead than an SSH tunnel?


> -geoff
>
>
>
> -
> Geoff Galitz
> Blankenheim NRW, Germany
> http://www.galitz.org/
> http://german-way.com/blog/
>
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Re: [CentOS] How to map ata#.# numbers to /dev/sd numbers?

[Peter Kjellstrom]

On Thursday 28 January 2010, Stephen Harris wrote:
> [ Sorry to merge messages; I appear to have lost Peter's post, so I'm
> replying to Peter and Mark in the same message ]
>
> Peter Kjellstrom wrote:
> > > On Thursday 28 January 2010, Stephen Harris wrote:
> > >> to determine what ata7.01 maps to in terms of /dev/sd# values?
> > >
> > > This seems quite hard to do. The following hack will match scsi hosts
> > > to libata-driver + number:
>
> Hmm, interesting:
>
> % for d in /sys/class/scsi_host/host*
> do
>   echo "$d $(cat $d/proc_name) $(cat $d/unique_id)"
> done
> /sys/class/scsi_host/host0 ahci 1
> /sys/class/scsi_host/host1 ahci 2
> /sys/class/scsi_host/host2 ahci 3
> /sys/class/scsi_host/host3 ahci 4
> /sys/class/scsi_host/host4 ahci 5
> /sys/class/scsi_host/host5 ahci 6
> /sys/class/scsi_host/host6 sata_sil24 7
> /sys/class/scsi_host/host7 sata_sil24 8
> /sys/class/scsi_host/host8 usb-storage 0
>
> So in this case ata7 appears to map to host6.  Now the usb-storage entry
> looks odd.  Do I have to magically know that ahci and sata_sil24 both map
> to "ata" entries?

AFAICT, I'm afraid so :-/

> >From lsscsi I see, for host 6
>
> [6:0:0:0]diskATA  ST31000340AS SD15  /dev/sdc
> [6:1:0:0]diskATA  ST31000340AS SD15  /dev/sdd
> [6:2:0:0]diskATA  ST31000340AS SD15  /dev/sde
> [6:3:0:0]diskATA  ST31000340AS AD14  /dev/sdf
>
> So I have to guess the second number in ata#.# represents the LUN of the
> device on that bus, so ata7.1 -> host6 -> [6:1:0:0] -> sdd

The LUN is actually the last of the four digits, the 2nd one is target 
(host:target:device:lun), but yes, your observation seems correct.

> This looks like an unreliable method of detection.  But it may be possible!

Uhu

> m.r...@5-cent.us wrote:
> > Have you checked dmesg? For example,
>
> Yeah, but dmesg has two problems that I can think of
> 1) it may disappear if the number of kernel messages grows sufficiently
> large
>
> 2) The ID number wasn't obvious
> scsi6 : sata_sil24
> scsi7 : sata_sil24
> ata7: SATA max UDMA/100 host m...@0xfe7fbf80 port 0xfe7fc000 irq 169
> ata8: SATA max UDMA/100 host m...@0xfe7fbf80 port 0xfe7fe000 irq 169
>
> How does that tell me ata7 matches scsi6?  We can't rely on ordering
> (see below).

That is basically why I tried to find a better way than "interpreting" dmesg, 
yes you can probably figure it out but man it's an ugly way...

> Further,
>
>   ata7: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
>   ata7.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
>   ata7.00: hard resetting link
>   ata7.00: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
>   ata7.01: hard resetting link
>   ata7.01: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>   ata7.02: hard resetting link
>   ata7.02: SATA link up 1.5 Gbps (SStatus 113 SControl 0)
>   ata7.03: hard resetting link
>   floppy0: no floppy controllers found
>   ata7.03: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>   ata7.04: hard resetting link
>   ata7.04: SATA link down (SStatus 0 SControl 320)
>   ata7.05: hard resetting link
>   ata7.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
>   ata7.00: ATA-8: ST31000340AS, SD15, max UDMA/133
>   ata7.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 31/32)
>   ata7.00: configured for UDMA/100
>   ata7.01: ATA-8: ST31000340AS, SD15, max UDMA/133
>   ata7.01: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>   ata7.01: configured for UDMA/100
>   ata7.02: ATA-8: ST31000340AS, SD15, max UDMA/133
>   ata7.02: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>   ata7.02: configured for UDMA/100
>   ata7.03: ATA-8: ST31000340AS, AD14, max UDMA/133
>   ata7.03: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>   ata7.03: configured for UDMA/100
>   ata7: EH complete
> Vendor: MaxtorModel: 6Y120P0   Rev: YAR4
> Type:   Direct-Access  ANSI SCSI revision: 02
>   SCSI device sdb: 240121728 512-byte hdwr sectors (122942 MB)
>   sdb: Write Protect is off
>   sdb: Mode Sense: 53 00 00 08
>   sdb: assuming drive cache: write through
>   SCSI device sdb: 240121728 512-byte hdwr sectors (122942 MB)
>   sdb: Write Protect is off
>   sdb: Mode Sense: 53 00 00 08
>   sdb: assuming drive cache: write through
>sdb:<6>ata8: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
>   ata8.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
>   ata8.00: hard resetting link
>   ata8.00: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
>
> As can be seen, different parts of detection appear to be interleaved
> (floppy detection message, sdb detection message - disk in a USB disk
> enclosure!) so I can't seem to rely on ordering of messages in dmesg to
> accurately determine which device has been assigned what ID.

Some order can be relied on, some not. Bottom line, you can by experience and 
testing find a correct mapping from dmesg, but really there should be a 
better way.

/Peter

> dmesg 

Re: [CentOS] Browser related question

[Kwan Lowe]

On Fri, Jan 29, 2010 at 3:12 AM, Rajagopal Swaminathan
 wrote:
> Greetings,
>
> How does one monitor if a site is being accessed using browser?
>
> IOW, I just want to know if a user has launched a session thru Firefox.
>
> I basically want to know if a user has tried to access the webserver
> and unable to reach it and log such instances.
>
> I am using cron and curl to seperately monitor the link.
>
> Any clues?

It is possible using the auditd subsysted. You'd need to define a rule
to match that user and firefox. I don't have the exact syntax, but the
rule I use for root in audit.rules is:

-a entry,always -S open -S close -S read -S write -S link -S unlink -S
chmod -S chown -S execve -F uid=root -k root_activity


If you do a man on auditctl it can show the options. You could, for
example, generate a rule whenever a particular user launches firefox,
etc..
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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Rainer Traut]

Am 28.01.2010 12:28, schrieb Rudi Ahlers:

> NOW, the question is: Which protocol would be best for this? I can only
> think of SMB, NFS&  iSCSI

How about NFS v4? It only needs one port which you can tunnel through ssh.

Rainer
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Re: [CentOS] Installing an SSL Cert

[J.Witvliet]

 

-Original Message-
From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
ML
Sent: Wednesday, January 27, 2010 1:38 AM
To: CentOS mailing list
Subject: [CentOS] Installing an SSL Cert

HI All,

I am considering buying this: 

http://www.godaddy.com/Compare/gdcompare_ssl.aspx?isc=sslqgo003a

Since I have a domain that will be collecting data and processing payments. 

Where can I find instructions on how to install the certificate?

Do I have to run another domain or sub domain for the store? Or can I just run 
the whole domain on https?

Thanks,
-Jason
___

Ever considerd cacert.org ?

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Kai Schaetzl]

Rudi Ahlers wrote on Fri, 29 Jan 2010 12:27:49 +0200:

> what do you mean by this?

exactly as he says. Any mounts can be undone (mount/umount). Maybe not 
thru your Cpanel, but in reality.

Kai

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Joseph L. Casale]

>Actually I know nothing about iSCSI, maybe it is more robust. 

No. Not if, but *when* you get the first disconnection, you will
likely incur corruption on the block device. That's like pulling
out a disc on a running server. Doesn't make for a dependable
backup solution...
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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[J.Witvliet]

From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of 
Rudi Ahlers
Sent: Friday, January 29, 2010 12:23 AM
To: CentOS mailing list
Subject: Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts



On Fri, Jan 29, 2010 at 1:18 AM, nate 
mailto:cen...@linuxpowered.net>> wrote:
Rudi Ahlers wrote:

> nate, why not? Is it simply unavoidable at all costs to mount on system on
> another, over a WAN? That's all I really want todo

If what you have now works, stick with it.. in general network
file systems are very latency sensitive.

CIFS might work best *if* your using a WAN optimization appliance,
I'm not sure how much support NFS gets from those vendors.

iSCSI certainly is the worst, block devices are very intolerant of
latency.

AFS may be another option though quite a bit more complicated, as
far as I know it's a layer on top of an existing file system that
is used for things like replication

http://www.openafs.org/

I have no experience with it myself.

nate


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Thanx nate, this is what I wanted to hear :)

So, is there any benefit in using NFS over SMB in this case?


Can't speak for NFS(3/4), but i can tell you that that smb-protocol combined 
with high latency is a recepy for disaster.
We tried it from europe to the carribean (both sat or fibre) but users spent 
their time more complaining then working.
Needed horrible expensive lan-optimesers at both end

So perhaps nfs4 or afs (later is intended for geographically separated 
machines, afaicr)
but certainly not smb!

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[J.Witvliet]

At any rate... if I were in your shoes and really restricted to the options you 
propose, I would go with CIFS mounts through IPSEC tunnels.

Wouldn't IPSEC add more  overhead than an SSH tunnel?

-geoff

I would *certainly* not use ssh-tunnels, on a line that is not 100% error free 
or with high latency.
In general tcp-in-tcp tunneling is BAD. One likely gets the infamous 
snowbal-effect.

As ipsec is lower in the protocol-stack (then openvpn) it has probably the 
lowest overhead.
ssh-tunnels are the worst (just nice for a quick tunnel in SOHO-environments)

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Ross Walker]

On Jan 29, 2010, at 2:37 AM, Rudi Ahlers  wrote:




On Fri, Jan 29, 2010 at 2:17 AM, Ross Walker   
wrote:

It's not easy backing up from behind the firewall.

What about using a service that will backup the mobile clients to an  
offsite repository that is accessible also from behind the firewall.


I was pitched something not too long ago about such a service, can't  
remember the name now unfortunately.


Otherwise you could look into some sort of WebDAV + Fuse setup or  
some specialized file system that is cached on the client but then  
syncs with the server in the background when available, then all  
your backups are local.

___


Hi Ross,

Backing up behind the firewall is made easy by using an SSH tunnel :)


Communications is easy, but that's not what I'm talking about, I'm  
talking the management and coordination of backups from behind the  
firewall.


We already have an offsite backup facility with a 3rd party, nbut I  
need more control over the backups, and want to setup an inhouse  
backup server which where all the client's account (this is hosting  
accounts & VPS's) be backed up to, then this server will do an rsync  
with all the data to the offsite backup server.


You might find this to be a Herculean task that even if implemented,  
impossible to support.


-Ross

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[CentOS] Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan

[Jason Pyeron]

I have no output in the logs, but /etc/init.d/network restart fixes the issue.
I am rsync/scp (10GB) data from one 100MB Full duplex host to an ASUS M3A78-EM
(RTL8111B/C). It locks up around the 1.5GB Tx mark.
If I ethtool -s eth0 autoneg off speed 100 duplex full it does not happen again.

Ideas?

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Re: [CentOS] Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan

[nate]

Jason Pyeron wrote:

> Ideas?

realtek sucks(massive evidence on the net over the past 10+ years),
get a real NIC(no pun intended).

nate

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Re: [CentOS] Skype and problem with ALSA mixer driver?

[Andrew]

> What version of ALSA driver are you using? Have you tried updating ALSA 
> as the version within CentOS is quite old now (1.0.14rc3).
> 
> Elrepo has an updated ALSA driver package here:
> 
> http://elrepo.org/tiki/kmod-alsa
> 
Thanks for that useful information, but can you tell me exactly how to
perform the update? I tried 'yum update *alsa*' as I have the Elrepo
repository installed, but it came up with 'No Packages marked for
Update'. Do I need to completely remove all the currently installed ALSA
packages and then do 'yum install kmod-alsa? Any advice gratefully
received, thanks.

Andy

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Re: [CentOS] Skype and problem with ALSA mixer driver?

[Akemi Yagi]

On Fri, Jan 29, 2010 at 10:44 AM, Andrew  wrote:
>> What version of ALSA driver are you using? Have you tried updating ALSA
>> as the version within CentOS is quite old now (1.0.14rc3).
>>
>> Elrepo has an updated ALSA driver package here:
>>
>> http://elrepo.org/tiki/kmod-alsa
>>
> Thanks for that useful information, but can you tell me exactly how to
> perform the update? I tried 'yum update *alsa*' as I have the Elrepo
> repository installed, but it came up with 'No Packages marked for
> Update'. Do I need to completely remove all the currently installed ALSA
> packages and then do 'yum install kmod-alsa? Any advice gratefully
> received, thanks.

Perhaps, you do not have elrepo enabled (default behavior) ?  In that case, try:

yum --enablerepo=elrepo install kmod-alsa

Akemi
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Re: [CentOS] Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan

[Tim Nelson]

- "Jason Pyeron"  wrote:
> I have no output in the logs, but /etc/init.d/network restart fixes
> the issue.
> I am rsync/scp (10GB) data from one 100MB Full duplex host to an ASUS
> M3A78-EM
> (RTL8111B/C). It locks up around the 1.5GB Tx mark.
> If I ethtool -s eth0 autoneg off speed 100 duplex full it does not
> happen again.
> 
> Ideas?

Part of the problem is that you mention r8169 kernel module in your subject but 
your hardware is RTL8111B. Realtek drivers are notorious for loading on 
improper hardware and appearing to work properly. You need to get the proper 
driver for your NIC. I've run into this countless times with the r8169 driver 
and non-r8169 Realtek NICs.

And, on a side note, Realtek may possibly be the worst NIC out there, 
especially for server use. It may link at gigabit speed, but I bet a trusty old 
3Com or Intel Pro 100 will get better throughput. Install a different NIC as 
fast as you can and never look back.

--Tim
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Re: [CentOS] Lockup using stock r8169 on 4.8 in gigabit mode during heavy transfer on lan

[Jason Pyeron]

 

> -Original Message-
> From: centos-boun...@centos.org 
> [mailto:centos-boun...@centos.org] On Behalf Of Tim Nelson
> Sent: Friday, January 29, 2010 14:05
> To: CentOS mailing list
> Subject: Re: [CentOS] Lockup using stock r8169 on 4.8 in 
> gigabit mode during heavy transfer on lan
> 
> - "Jason Pyeron"  wrote:
> > I have no output in the logs, but /etc/init.d/network restart fixes 
> > the issue.
> > I am rsync/scp (10GB) data from one 100MB Full duplex host 
> to an ASUS 
> > M3A78-EM (RTL8111B/C). It locks up around the 1.5GB Tx mark.
> > If I ethtool -s eth0 autoneg off speed 100 duplex full it does not 
> > happen again.
> > 
> > Ideas?
> 
> Part of the problem is that you mention r8169 kernel module 
> in your subject but your hardware is RTL8111B. Realtek 
> drivers are notorious for loading on improper hardware and 
> appearing to work properly. You need to get the proper driver 
> for your NIC. I've run into this countless times with the 
> r8169 driver and non-r8169 Realtek NICs.

Good to know. Thanks.

> 
> And, on a side note, Realtek may possibly be the worst NIC 
> out there, especially for server use. It may link at gigabit 
> speed, but I bet a trusty old 3Com or Intel Pro 100 will get 
> better throughput. Install a different NIC as fast as you can 
> and never look back.
> 

The system was not purchased for 1000MB use, but all of the switches are. We
just took the mobo that was cheapest/fastest to get a non-production up ASAP.

> --Tim
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Re: [CentOS] Browser related question

[Agile Aspect]

On Fri, Jan 29, 2010 at 12:12 AM, Rajagopal Swaminathan
 wrote:
> Greetings,
>
> How does one monitor if a site is being accessed using browser?
>
> IOW, I just want to know if a user has launched a session thru Firefox.
>
> I basically want to know if a user has tried to access the webserver
> and unable to reach it and log such instances.
>
> I am using cron and curl to seperately monitor the link.
>
> Any clues?
>
> Centos 5.2/Gnome/Firefox 3.0.16

It's clear what it is you're trying to do, but If you're running
Apache, turn on

 CustomLog "logs/access_log" combined

The default is

 CustomLog "logs/access_log" common

It will not only log the browser type, it will also log the OS in the
access_log file.

For errors accessing files, see the error_log.

If the client can't reach the site, then it should be clear the server
won't be able to log the attempt.


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[CentOS] perl question

[Jerry Geis]

I am trying to run a perl script that said it needs Net::SMPP

I ran this:
your_host]# *perl -MCPAN -e shell*
cpan shell -- CPAN exploration and modules installation (v1.76)
ReadLine support enabled
cpan> *install Net::SNMP

seemed to work. no errors reported.
however when I run perl I still get the same error saying needs

 ./sendmessage.pl
Can't locate Net/SMPP.pm in @INC (@INC contains: 
/usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi 
/usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl 
/usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi 
/usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl 
/usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) 
at ./sendmessage.pl line 18.
BEGIN failed--compilation aborted at ./sendmessage.pl line 18.

What else do I need?

Jerry
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Re: [CentOS] perl question

[linux-crazy]

Hi,

 Check line 18. of your code or paste your code so it  will be more
usefull and which version of OS you are running.



On Sat, Jan 30, 2010 at 12:58 AM, Jerry Geis  wrote:
> I am trying to run a perl script that said it needs Net::SMPP
>
> I ran this:
> your_host]# *perl -MCPAN -e shell*
> cpan shell -- CPAN exploration and modules installation (v1.76)
> ReadLine support enabled
> cpan> *install Net::SNMP
>
> seemed to work. no errors reported.
> however when I run perl I still get the same error saying needs
>
>  ./sendmessage.pl
> Can't locate Net/SMPP.pm in @INC (@INC contains:
> /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl
> /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl
> /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .)
> at ./sendmessage.pl line 18.
> BEGIN failed--compilation aborted at ./sendmessage.pl line 18.
>
> What else do I need?
>
> Jerry
> *
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Re: [CentOS] perl question

[m . roth]

> I am trying to run a perl script that said it needs Net::SMPP
>
> I ran this:
> your_host]# *perl -MCPAN -e shell*
> cpan shell -- CPAN exploration and modules installation (v1.76)
> ReadLine support enabled
> cpan> *install Net::SNMP
>
> seemed to work. no errors reported.
> however when I run perl I still get the same error saying needs
>
>  ./sendmessage.pl
> Can't locate Net/SMPP.pm in @INC (@INC contains:
> /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl
> /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl
> /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .)
> at ./sendmessage.pl line 18.
> BEGIN failed--compilation aborted at ./sendmessage.pl line 18.
>
> What else do I need?

Two possibilities - but first, did you type the asterisk before install?
Anyway, did cpan *say* that it had successfully installed? I've had things
fail, and have to go into .cpan/Build/, and make;make install. The
other possibility is that for some reason, it's not where it needed to be,
and you might try yum install Net-SNMP

   mark

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Re: [CentOS] perl question

[Joseph L. Casale]

>I am trying to run a perl script that said it needs Net::SMPP
>
>I ran this:
>your_host]# *perl -MCPAN -e shell*

Ouch dude, you just broke your server. Try to yum update anything perl
related in the future:)

>What else do I need?

First, install SMPP, not SNMP?

Second, use a repo, use span2rpm... Then force the rpm in I guess to bring the 
rpm db
into a blissfully ignorant, but happy state:)

http://dag.wieers.com/rpm/packages/perl-Net-SNPP/
http://www.mediaburst.co.uk/blog/creating-perl-module-rpms/

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Re: [CentOS] perl question

[Joseph L. Casale]

>Second, use a repo, use span2rpm... Then force the rpm in I guess to bring the 
>rpm db
>into a blissfully ignorant, but happy state:)

s/span2rpm/cpan2rpm/
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Re: [CentOS] perl question

[Greg Patton]

On 1/29/2010 11:40 AM, m.r...@5-cent.us wrote:
>> I am trying to run a perl script that said it needs Net::SMPP
>>
>> I ran this:
>> your_host]# *perl -MCPAN -e shell*
>> cpan shell -- CPAN exploration and modules installation (v1.76)
>> ReadLine support enabled
>> cpan>  *install Net::SNMP
>>
>> seemed to work. no errors reported.
>> however when I run perl I still get the same error saying needs
>>
>>   ./sendmessage.pl
>> Can't locate Net/SMPP.pm in @INC (@INC contains:
>> /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
>> /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl
>> /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
>> /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl
>> /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .)
>> at ./sendmessage.pl line 18.
>> BEGIN failed--compilation aborted at ./sendmessage.pl line 18.
>>
>> What else do I need?
>>  
>
You need to learn how to actually read the output of error messages. :-) 
It states very clearly what it failed on and that loading the module 
Net::SMPP (Can't locate Net/SMPP.pm)! Change the use line in your script 
to read use Net::SNMP and I will be you it works like a hot darn.

Don't ya hate when you miss the obvious? :-)

...Greg

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Re: [CentOS] perl question

[Les Mikesell]

On 1/29/2010 1:28 PM, Jerry Geis wrote:
> I am trying to run a perl script that said it needs Net::SMPP
>
> I ran this:
> your_host]# *perl -MCPAN -e shell*
> cpan shell -- CPAN exploration and modules installation (v1.76)
> ReadLine support enabled
> cpan>  *install Net::SNMP
>
> seemed to work. no errors reported.
> however when I run perl I still get the same error saying needs
>
>   ./sendmessage.pl
> Can't locate Net/SMPP.pm in @INC (@INC contains:
> /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl
> /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi
> /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl
> /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .)
> at ./sendmessage.pl line 18.
> BEGIN failed--compilation aborted at ./sendmessage.pl line 18.
>
> What else do I need?

Is that a typo or did you actually install Net::SNMP when the script 
wants Net:SMPP?

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Re: [CentOS] perl question

[Jerry Geis]

>
> Ouch dude, you just broke your server. Try to yum update anything perl
> related in the future:)
>
> >/What else do I need?
> /
> First, install SMPP, not SNMP?
>
> Second, use a repo, use span2rpm... Then force the rpm in I guess to bring 
> the rpm db
> into a blissfully ignorant, but happy state:)
>   
sorry for the typo - I was wanting SMPP.
Line 18 reads:
use Net::SMPP;

Jerry
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Re: [CentOS] Skype and problem with ALSA mixer driver?

[Andrew]

On Fri, 2010-01-29 at 11:03 -0800, Akemi Yagi wrote:
> On Fri, Jan 29, 2010 at 10:44 AM, Andrew  wrote:
> >> What version of ALSA driver are you using? Have you tried updating ALSA
> >> as the version within CentOS is quite old now (1.0.14rc3).
> >>
> >> Elrepo has an updated ALSA driver package here:
> >>
> >> http://elrepo.org/tiki/kmod-alsa
> >>
> > Thanks for that useful information, but can you tell me exactly how to
> > perform the update? I tried 'yum update *alsa*' as I have the Elrepo
> > repository installed, but it came up with 'No Packages marked for
> > Update'. Do I need to completely remove all the currently installed ALSA
> > packages and then do 'yum install kmod-alsa? Any advice gratefully
> > received, thanks.
> 
> Perhaps, you do not have elrepo enabled (default behavior) ?  In that case, 
> try:
> 
> yum --enablerepo=elrepo install kmod-alsa
> 
> Akemi

Many thanks,
I've installed kmod-alsa OK but the mic is still not working (with
skype). Do I need to remove the old ALSA packages alsa-lib and
alsa-utils? - because when I type 'yum erase alsa-lib alsa-utils' it
wants to remove 123 packages!

Andy

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Re: [CentOS] NFS vs SMb vs iSCSI for remote backup mounts

[Les Mikesell]

On 1/29/2010 1:37 AM, Rudi Ahlers wrote:
>
> Backing up behind the firewall is made easy by using an SSH tunnel :)
>
> We already have an offsite backup facility with a 3rd party, but I need
> more control over the backups, and want to setup an inhouse backup
> server which where all the client's account (this is hosting accounts &
> VPS's) be backed up to, then this server will do an rsync with all the
> data to the offsite backup server.

Can't this be at the same location as the source of the data to 
eliminate the latency issue?

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[CentOS] CentOS 5 i386 Live CD

[Mike McCarty]

Johnny Hughes wrote:
> I forgot to add that the password for root and centos is:
> 
> 12qwaszx
> 
> Johnny Hughes wrote:
>> The CentOS Development team is pleased to announce the availability of
>> the CentOS 5 i386 Live CD.

[...]

>> This CD has a non writable /usr directory, which means it is not able to
>> have software installed on it after boot up.  The CentOS team is working
>> hard to create a Live CD for CentOS 5 that is based on the Fedora Live
>> CD Project (that is writable in all directories and even able to be used
>> for installs) ... unfortunately we were not able to get this working
>> with CentOS 5 for this release.  We hope to get that Live CD working by
>> the release of CentOS 5.1.

Did I miss some notices? I don't recall seeing another LiveCD.
How is progress coming?

Mike
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[CentOS] APC Smart-ups "status codes" (slightly OT)

[m . roth]

We got replacement battery "kits" for some of our APC UPS' (Smart-UPS,
rackmount). I put them into one tray (it's for an RBC 43, which takes 8,
and weighs a ton), and put it in, and let it charge. Idiot "change
battery" led stays on. So I hit the test button, it discharges very
rapidly (a good number of servers on this), and the led stays on.

For some reason, apcupsd's USB test fails, with an HIDDEV i/o error. So I
got rid of the weird APC usb cable, and put in one of their serial cables,
and run the "smart" test (the USB does more), and get results showing
everything's fine.

But the idiot light's still on.

So, looking at all the values that the "apcsmart" choice can give me, the
first thing is UPS status. I've been googling for a while, and can't find
a single reference to it. Anyone have a link to somewhere that will give
me the status codes (and their meaning)?

Thanks in advance.

mark


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Re: [CentOS] APC Smart-ups "status codes" (slightly OT)

[Warren Young]

On 1/29/2010 2:53 PM, m.r...@5-cent.us wrote:
> Idiot "change battery" led stays on.

By chance, I just did an RBC 23 change the other day.

The docs I got with it said to let it charge for 8 hours, then do the 
self-test.  On my UPS, that means holding the On button for a few 
seconds.  (A single regular press does nothing but make it beep, if it's 
already on.)

You might also want to write the battery change date to the UPS.  I 
don't know if it will affect the light, but it'll help you figure 
battery life when it comes time to change them again years from now:

# upsrw -uadmin -s battery.date=01/29/10 ap...@localhost

Adjust names as appropriate.
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Re: [CentOS] APC Smart-ups "status codes" (slightly OT)

[Ron Loftin]

On Fri, 2010-01-29 at 16:53 -0500, m.r...@5-cent.us wrote:
> We got replacement battery "kits" for some of our APC UPS' (Smart-UPS,
> rackmount). I put them into one tray (it's for an RBC 43, which takes 8,
> and weighs a ton), and put it in, and let it charge. Idiot "change
> battery" led stays on. So I hit the test button, it discharges very
> rapidly (a good number of servers on this), and the led stays on.
> 
> For some reason, apcupsd's USB test fails, with an HIDDEV i/o error. So I
> got rid of the weird APC usb cable, and put in one of their serial cables,
> and run the "smart" test (the USB does more), and get results showing
> everything's fine.
> 
> But the idiot light's still on.
> 
> So, looking at all the values that the "apcsmart" choice can give me, the
> first thing is UPS status. I've been googling for a while, and can't find
> a single reference to it. Anyone have a link to somewhere that will give
> me the status codes (and their meaning)?
> 
The only thing that comes to mind is to check out NUT ( Network UPS
Tools ) at http://www.networkupstools.org and see if their source code
can answer your questions.

I've been using NUT for some time with APC units and had no issues when
changing batteries, but I have a vague memory of some models being fussy
about noticing the new battery.  Google should be able to find those
discussions for you.

> Thanks in advance.
> 
> mark
> 
> 
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Re: [CentOS] APC Smart-ups "status codes" (slightly OT)

[m . roth]

>
> On Fri, 2010-01-29 at 16:53 -0500, m.r...@5-cent.us wrote:

>> But the idiot light's still on.
>>
>> So, looking at all the values that the "apcsmart" choice can give me,
>> the first thing is UPS status. I've been googling for a while, and can't
>> find a single reference to it. Anyone have a link to somewhere that will
>> give me the status codes (and their meaning)?
>>
> The only thing that comes to mind is to check out NUT ( Network UPS
> Tools ) at http://www.networkupstools.org and see if their source code
> can answer your questions.

THANK YOU! That was it!
>
> I've been using NUT for some time with APC units and had no issues when
> changing batteries, but I have a vague memory of some models being fussy
> about noticing the new battery.  Google should be able to find those
> discussions for you.

Hmmm... that could be the problem. I'll look Monday.

Thanks, very much.

mark

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Re: [CentOS] Full Virtualized DomU won't boot

[Sergio Belkin]

2010/1/28 Pasi Kärkkäinen :
> On Wed, Jan 27, 2010 at 07:21:54PM -0300, Sergio Belkin wrote:
>> Hi, I use Centos 5.4 x86_64
>>
>> kernel used is 2.6.18-164.11.1.el5xen
>>
>> I have a physical machine running Debian Etch (32 bit) and Debian
>> Lenny and I virtualized the first one as follows:
>>
>> *Created a HVM DomU with Virt-Manager with a virtual disk file of 4 M
>> *Boot from LiveCD, and created a swap and a ext3 partitions (Yes, very
>> simple layout).
>> *Rsync'd files from root partition of physical machine to partition
>> mounted on LiveCD on DomU.
>> *Chrooted and edited files /boot/grub/menu.lst, /etc/fstab, etc/mtab,
>> /boot/grub/device.map.
>> *Then I rebooted from hard disk and stay freezed with the message
>> "booting from hard disk" . But it doesn't boot at all from hard disk.
>>
>> I can boot using grub-rescue-cdrom, but if I try to install grub with
>> grub-install it outputs:
>>
>>
>> "The file /boot/grub/stage1 not read correctly"
>>
>> (I've tried --recheck option, and depmod and update-grub commands with
>> no success)
>>
>
> Well.. stage1 is definitely needed by grub. So grub didn't get installed.
> Your domU can't boot then.
>
> - Do you have the stage1 file there?
> - Was the partition layout the same for the old server?
> - Is the grub.conf "root (hd0,X)" correct for the new disk?
>
> You can install grub from grub-shell like this, after chrooting to the 
> filesystem:
>
> # grub
> device (hd0) /dev/sda
> root (hd0,0)
> setup (hd0)
>
> replace "hd0,0" with the correct partition index.
>

I've tried that, If that was the  problem, I hadn't asked help to the list  :)

I've found that it was a misunderstanding between Grub and the
filesystem. Target filesystem has inodes of 256 bytes while debian
etch version can read inodes of 128 bytes.


>> --
>> --
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>> Watch More TV http://sebelk.blogspot.com
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[CentOS] Multiple RAID support in CentOS?

[Victor Padro]

Hello,

I was wondering if someone could help me, I'm putting together a
Server for personal use, I want to virtualize a few servers(mail, web,
ssh) and use it as a NAS, but I have a question if I can use Multiple
RAID Arrays using the following HW:

Intel Xeon Quad Core X3430
ASUS P7F-M LGA 1156
- LSI MegaRAID(integrated)
- HighPoint RocketRAID 2640x1
2 Hitachi 500GB HDDs
4 Hitachi 1TB HDDs

I want to use one array with the 2 500GB HDDs in RAID1 for the OS and
for some VMs, and the other 4 1TB HDDs I want to create an array in
RAID5 or RAID10 for file sharing across my home Network.
I found a guide but it's a little bit outdated and it's for Debian...

Do you have any other pointer I can read/use?


TIA.

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Re: [CentOS] Skype and problem with ALSA mixer driver?

[Ned Slider]

Andrew wrote:
> On Fri, 2010-01-29 at 11:03 -0800, Akemi Yagi wrote:
>> On Fri, Jan 29, 2010 at 10:44 AM, Andrew  wrote:
 What version of ALSA driver are you using? Have you tried updating ALSA
 as the version within CentOS is quite old now (1.0.14rc3).

 Elrepo has an updated ALSA driver package here:

 http://elrepo.org/tiki/kmod-alsa

>>> Thanks for that useful information, but can you tell me exactly how to
>>> perform the update? I tried 'yum update *alsa*' as I have the Elrepo
>>> repository installed, but it came up with 'No Packages marked for
>>> Update'. Do I need to completely remove all the currently installed ALSA
>>> packages and then do 'yum install kmod-alsa? Any advice gratefully
>>> received, thanks.
>> Perhaps, you do not have elrepo enabled (default behavior) ?  In that case, 
>> try:
>>
>> yum --enablerepo=elrepo install kmod-alsa
>>
>> Akemi
> 
> Many thanks,
> I've installed kmod-alsa OK but the mic is still not working (with
> skype). Do I need to remove the old ALSA packages alsa-lib and
> alsa-utils? - because when I type 'yum erase alsa-lib alsa-utils' it
> wants to remove 123 packages!
> 
> Andy
> 

No, do *not* remove alsa-lib or alsa-utils (they are core CentOS packages).

Have you rebooted since installing kmod-alsa as the kernel will need to 
load the new drivers? If not, please reboot and retest.

If it's still not working after updating ALSA using kmod-alsa from 
elrepo (after a reboot), then you might want to consider removing that 
package as it hasn't fixed the problem in your case:

yum erase kmod-alsa

Hope that helps.

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Re: [CentOS] Multiple RAID support in CentOS?

[Ian Blackwell]

On 30/01/2010 12:09 PM, Victor Padro wrote:
> Hello,
>
> I was wondering if someone could help me, 
I'll try...
> I want to use one array with the 2 500GB HDDs in RAID1 for the OS and
> for some VMs, 
That will work OK.
> and the other 4 1TB HDDs I want to create an array in
> RAID5 or RAID10 for file sharing across my home Network.
>   
You can use these disks in a RAID5 array, but not RAID10.  I fairly sure
you need more than 4.  RAID10 is mirrored, so you only have "2" disks in
the array, which isn't enough for parity/striping stuff.  You need at
least "3", which would mean 6 disks for RAID10.

Having said that, I'm assuming you want to use the entire hard disk as a
participant in an array.  You could create 2 x 500Gb partions on each
disk and then you have 8 x 500Gb partitions to use in a RAID10 array. 
This approach sacrifices some redundancy though.  If a disk dies
entirely, then you will lose two participants in the RAID array, which
may or may not be catastrophic - it depends on what you put where...
> I found a guide but it's a little bit outdated and it's for Debian...
>
> Do you have any other pointer I can read/use?
>   
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5

I've mostly installed RAID arrays at install time, which you'll need to
do as well if you want to put the OS on a RAID1 array.
>
> TIA.
>
>   
Ian
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Re: [CentOS] Multiple RAID support in CentOS?

[Brian Mathis]

On Fri, Jan 29, 2010 at 9:09 PM, Ian Blackwell  wrote:
> On 30/01/2010 12:09 PM, Victor Padro wrote:
>> Hello,
>>
>> I was wondering if someone could help me,
> I'll try...
>> I want to use one array with the 2 500GB HDDs in RAID1 for the OS and
>> for some VMs,
> That will work OK.
>> and the other 4 1TB HDDs I want to create an array in
>> RAID5 or RAID10 for file sharing across my home Network.
>>
> You can use these disks in a RAID5 array, but not RAID10.  I fairly sure
> you need more than 4.  RAID10 is mirrored, so you only have "2" disks in
> the array, which isn't enough for parity/striping stuff.  You need at
> least "3", which would mean 6 disks for RAID10.
>
> Having said that, I'm assuming you want to use the entire hard disk as a
> participant in an array.  You could create 2 x 500Gb partions on each
> disk and then you have 8 x 500Gb partitions to use in a RAID10 array.
> This approach sacrifices some redundancy though.  If a disk dies
> entirely, then you will lose two participants in the RAID array, which
> may or may not be catastrophic - it depends on what you put where...
>> I found a guide but it's a little bit outdated and it's for Debian...
>>
>> Do you have any other pointer I can read/use?
>>
> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
>
> I've mostly installed RAID arrays at install time, which you'll need to
> do as well if you want to put the OS on a RAID1 array.
>>
>> TIA.
>>
> Ian

RAID10 does not use parity, it's just a mirror of stripes, so 4 disks
will work perfectly fine with it.

Use RAID10 for speed, and RAID5 if the space is more of an issue.
With RAID10 you lose 1/2 the total space, and with RAID5 you lose 1
disk's worth.
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Re: [CentOS] Multiple RAID support in CentOS?

[Ross Walker]

On Jan 29, 2010, at 9:16 PM, Brian Mathis   
wrote:

> On Fri, Jan 29, 2010 at 9:09 PM, Ian Blackwell  wrote:
>> On 30/01/2010 12:09 PM, Victor Padro wrote:
>>> Hello,
>>>
>>> I was wondering if someone could help me,
>> I'll try...
>>> I want to use one array with the 2 500GB HDDs in RAID1 for the OS  
>>> and
>>> for some VMs,
>> That will work OK.
>>> and the other 4 1TB HDDs I want to create an array in
>>> RAID5 or RAID10 for file sharing across my home Network.
>>>
>> You can use these disks in a RAID5 array, but not RAID10.  I fairly  
>> sure
>> you need more than 4.  RAID10 is mirrored, so you only have "2"  
>> disks in
>> the array, which isn't enough for parity/striping stuff.  You need at
>> least "3", which would mean 6 disks for RAID10.
>>
>> Having said that, I'm assuming you want to use the entire hard disk  
>> as a
>> participant in an array.  You could create 2 x 500Gb partions on each
>> disk and then you have 8 x 500Gb partitions to use in a RAID10 array.
>> This approach sacrifices some redundancy though.  If a disk dies
>> entirely, then you will lose two participants in the RAID array,  
>> which
>> may or may not be catastrophic - it depends on what you put where...
>>> I found a guide but it's a little bit outdated and it's for  
>>> Debian...
>>>
>>> Do you have any other pointer I can read/use?
>>>
>> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
>>
>> I've mostly installed RAID arrays at install time, which you'll  
>> need to
>> do as well if you want to put the OS on a RAID1 array.
>>>
>>> TIA.
>>>
>> Ian
>
> RAID10 does not use parity, it's just a mirror of stripes, so 4 disks
> will work perfectly fine with it.
>
> Use RAID10 for speed, and RAID5 if the space is more of an issue.
> With RAID10 you lose 1/2 the total space, and with RAID5 you lose 1
> disk's worth.

Small correction RAID10 is a stripe of mirrors rather then a mirror of  
stripes which does not provide the same resiliency.

-Ross

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Re: [CentOS] Multiple RAID support in CentOS?

[Victor Padro]

On Fri, Jan 29, 2010 at 8:09 PM, Ian Blackwell  wrote:
> On 30/01/2010 12:09 PM, Victor Padro wrote:
>> Hello,
>>
>> I was wondering if someone could help me,
> I'll try...
>> I want to use one array with the 2 500GB HDDs in RAID1 for the OS and
>> for some VMs,
> That will work OK.
>> and the other 4 1TB HDDs I want to create an array in
>> RAID5 or RAID10 for file sharing across my home Network.
>>
> You can use these disks in a RAID5 array, but not RAID10.  I fairly sure
> you need more than 4.  RAID10 is mirrored, so you only have "2" disks in
> the array, which isn't enough for parity/striping stuff.  You need at
> least "3", which would mean 6 disks for RAID10.
>
> Having said that, I'm assuming you want to use the entire hard disk as a
> participant in an array.  You could create 2 x 500Gb partions on each
> disk and then you have 8 x 500Gb partitions to use in a RAID10 array.
> This approach sacrifices some redundancy though.  If a disk dies
> entirely, then you will lose two participants in the RAID array, which
> may or may not be catastrophic - it depends on what you put where...
>> I found a guide but it's a little bit outdated and it's for Debian...
>>
>> Do you have any other pointer I can read/use?
>>
> http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5
>
> I've mostly installed RAID arrays at install time, which you'll need to
> do as well if you want to put the OS on a RAID1 array.
>>
>> TIA.
>>
>>
> Ian
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>

Thank you Ian, but I disagree in your concept of RAID10:

[quote]
RAID 10
RAID 1+0 (or 10) is a mirrored data set (RAID 1) which is then striped
(RAID 0), hence the "1+0" name. A RAID 1+0 array requires a minimum of
four drives: two mirrored drives to hold half of the striped data,
plus another two mirrored for the other half of the data. In Linux MD
RAID 10 is a non-nested RAID type like RAID 1, that only requires a
minimum of two drives, and may give read performance on the level of
RAID 0.
[quote]

I'll read that howto, is for fakeRAID though...

TIA

-- 
Linux User #452368
http://twitter.com/vpadro

"Everything that irritates us about others can lead us to an
understanding of ourselves"
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Re: [CentOS] Multiple RAID support in CentOS?

[Ian Blackwell]

On 30/01/2010 1:42 PM, Victor Padro wrote:
> I'll read that howto, is for fakeRAID though...
> TIA
>
>   
Yes, I got RAID10 wrong - knew I would (haven't used it before).  If
you're using hardware RAID, then the Op/Sys will just see two disks and
you don't really need a HowTo.  How you partition/use them is up to you
when you install.  I know there is continuous debate about hardware vs.
software RAID, but I've only ever had problems with hardware, and never
any problems with software.  Your mileage may vary :)

Ian
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Re: [CentOS] Browser related question

[Rajagopal Swaminathan]

Greetings,

Thanks a lot

> On Fri, Jan 29, 2010 at 4:13 PM, Kwan Lowe  wrote:
> On Fri, Jan 29, 2010 at 3:12 AM, Rajagopal Swaminathan
>  wrote:
>
> It is possible using the auditd subsysted. You'd need to define a rule

I presume you meant subsystem..

>
> -a entry,always -S open -S close -S read -S write -S link -S unlink -S
> chmod -S chown -S execve -F uid=root -k root_activity

I will look into that..

Regards,

Rajagopal
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Re: [CentOS] Browser related question

[Rajagopal Swaminathan]

Greetings,

Thanks for the reply.

On Sat, Jan 30, 2010 at 12:58 AM, Agile Aspect  wrote:
>
> It's clear what it is you're trying to do, but If you're running
> Apache, turn on

I am not running apache and it may not be feasible as the clients are
not endowed enough.

>
> If the client can't reach the site, then it should be clear the server
> won't be able to log the attempt.

In fact this is exactly the condition I wanted to capture as
unavailability window

FWIW, I am approaching this with tcpdump

tcpdump -s 0 -A -i eth0 -n -q - '(dst host  and dst port
80) and tcp[13] == 2'

Basically checking for the SYN flag in the outgoing traffic.

But it is generating too much data for my purposes.

Another approach I have in mind is running a proxy and logging the
outgoing  connection -- will that be resource hungry? I've never tried
squid

Ideas?

Regards

Rajagopal

Regards,

Rajagopal

Is this the correct way?
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Re: [CentOS] Browser related question

[Les Mikesell]

Rajagopal Swaminathan wrote:
> Greetings,
> 
> Thanks for the reply.
> 
> On Sat, Jan 30, 2010 at 12:58 AM, Agile Aspect  wrote:
>> It's clear what it is you're trying to do, but If you're running
>> Apache, turn on
> 
> I am not running apache and it may not be feasible as the clients are
> not endowed enough.
> 
>> If the client can't reach the site, then it should be clear the server
>> won't be able to log the attempt.
> 
> In fact this is exactly the condition I wanted to capture as
> unavailability window
> 
> FWIW, I am approaching this with tcpdump
> 
> tcpdump -s 0 -A -i eth0 -n -q - '(dst host  and dst port
> 80) and tcp[13] == 2'
> 
> Basically checking for the SYN flag in the outgoing traffic.
> 
> But it is generating too much data for my purposes.
> 
> Another approach I have in mind is running a proxy and logging the
> outgoing  connection -- will that be resource hungry? I've never tried
> squid

Depending on the nature of the content and the number of users, running a squid 
with caching enabled can be a resource win - and it will give you the log you 
want as long as the browser(s) are configured to use it.

-- 
   Les Mikesell
lesmikes...@gmail.com
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Re: [CentOS] Browser related question

[John R Pierce]

Les Mikesell wrote:
> Depending on the nature of the content and the number of users, running a 
> squid 
> with caching enabled can be a resource win - and it will give you the log you 
> want as long as the browser(s) are configured to use it.
>   

if you have control over the internet gateway, you can force -all- web 
traffic to transparently be routed to the squid proxy, and then process 
the squid access and error logs, perhaps with a perl script (perl really 
rocks for this sort of thing).






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[CentOS] Recover /usr/lib/libc.a

[Zvi Vered]

Hello,

I'm using Centos:

/proc/version = Linux version 2.6.18-128.el5
(mockbu...@builder16.centos.org) (gcc version 4.1.2 20080704 (Red Hat
4.1.2-44)) #1 SMP Wed Jan 21 10:44:23 EST 2009

I did a mistake and erased libc.a from /usr/lib

How can I recover it without reinstalling Centos ?

Thanks.
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Re: [CentOS] Browser related question

[Rajagopal Swaminathan]

Greetings,

Thanks for the reply.

On Sat, Jan 30, 2010 at 11:25 AM, Les Mikesell  wrote:
>
> Depending on the nature of the content and the number of users, running a 
> squid
> with caching enabled can be a resource win - and it will give you the log you
> want as long as the browser(s) are configured to use it.
>

IOW, Two programs Firefox and squid proxy running every such box :
Centos Desktops running in GUI mode.

Will 512MB RAM be sufficient to what you are suggesting?

I have over 300 such desktops distributed across the geographical
having a unpredictable connectivity and each one of them just use one
browser based on-line application and some cron scripts for monitoring
and logging simple details.

Changing the h/w configuration is nearly impossible now..

or is there another lightweight solution?

Thanks again Les,

Regards

Rajagopal
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Re: [CentOS] Browser related question

[Rajagopal Swaminathan]

Greetings,

On Sat, Jan 30, 2010 at 11:28 AM, John R Pierce  wrote:
>
> if you have control over the internet gateway, you can force -all- web
> traffic to transparently be routed to the squid proxy, and then process
> the squid access and error logs, perhaps with a perl script (perl really
> rocks for this sort of thing).
>

Thanks John for the reply and suggestion.

It seems increasingly certain that I will have setup proxy.

Regards

Rajagopal
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Re: [CentOS] Recover /usr/lib/libc.a

[Frank Cox]

On Sat, 2010-01-30 at 08:14 +0200, Zvi Vered wrote:
> I did a mistake and erased libc.a from /usr/lib
> 
> How can I recover it without reinstalling Centos ?

/usr/lib/libc.a is provided as part of the glibc-devel rpm.

If you merely erased the file with a rm command or something like that,
you can probably just download the glibc-devel rpm from your friendly
neighbourhood Centos mirror site, extract libc.a from it and copy it
back into /usr/lib.

Or you could download the glibc-devel rpm and use the rpm command with
the "--replacepkgs" directive to reinstall the whole rpm.

Either method should work.

-- 
MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com

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