Re: [CentOS] change /etc/security/limits.conf need reboot or not?

[Woehrle Hartmut SBB CFF FFS (Extern)]

> I rmeember you can just exist the shell and log on again to apply the 
> changes. Not really a reboot.
>
> You can check it with ulimit -a for the list items of the changes.
Yes logout and login again helps - but only your shell environment.
Every process/daemon/database has its own (unchanged) environment. So you have 
to restart also the database processes, to force a new setup for the 
environment variables.
If you want to be really save, a reboot will be the best.

>
> 
> Banyan He
> Blog: http://www.rootong.com
> Email: ban...@rootong.com
>
> On 3/21/2013 2:52 AM, mcclnx mcc wrote:
> > We have CEntos 5.5 on DELL server.  Due to more and more databases run on 
> > same server sometime processes number read max and cause > 'resource 
> > temporary unavailable".
> >
> > I plan to change /etc/security/limits.conf value:
> >
> > oracle  softnproc  2047 ==> 4096
> >
> > Do i need reboot to make it effect?
> >
> > How to test change is effect?
> >
> > Thanks.


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[CentOS] posfix admin issue

[Austin Einter]

Dear All
I had successfully installed posfixadmin. I was able to login to postfix
admin and create email ids etc.

In something broken (not sure which one caused the issue), I am
experiencing below problem with postfix admin.

1. I am able to access domain/mailadmin page.
2. I can create admin accounts at domain/mailadmin/setup.php
3. I can see the admin login page by access

But when I enter my admin mailid, and password (i am 100% sure these are
correct), it goes to a page domain/login.php and then says "Page not found".

My question is why it is redirecting wrongly to domain/login.php.

Kindly help me.

Please note that I have all other things working like amavisd, dovecot etc,
I am able to send recv mails for accounts that I created previously.

Regards
Austin
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[CentOS] Network interface status

[isdtor]

Under CentOS6, is it possible to get an interface to RUNNING state
without assigning a (dummy) IP address?

# ifconfig em2
em2   Link encap:Ethernet  HWaddr 78:2B:CB:67:3E:5C
  UP BROADCAST MULTICAST  MTU:1500  Metric:1
  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000
  RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

This was working fine on RHEL3 simply by running ifconfig up.

# ifconfig eth1 up
# ifconfig eth1
eth1  Link encap:Ethernet  HWaddr 00:11:25:57:8B:2D
  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
  RX packets:10658057 errors:0 dropped:0 overruns:0 frame:0
  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1000
  RX bytes:1169901971 (1115.7 Mb)  TX bytes:0 (0.0 b)
  Base address:0x3400 Memory:d024-d026

# dmesg |grep eth1
...
e1000: eth1: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
#

provided there is a link.
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Re: [CentOS] Network interface status

[Banyan He]

Maybe you will like ethtool from now.


Banyan He
Blog: http://www.rootong.com
Email: ban...@rootong.com

On 3/21/2013 5:21 PM, isdtor wrote:
> Under CentOS6, is it possible to get an interface to RUNNING state
> without assigning a (dummy) IP address?
>
> # ifconfig em2
> em2   Link encap:Ethernet  HWaddr 78:2B:CB:67:3E:5C
>UP BROADCAST MULTICAST  MTU:1500  Metric:1
>RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>collisions:0 txqueuelen:1000
>RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>
> This was working fine on RHEL3 simply by running ifconfig up.
>
> # ifconfig eth1 up
> # ifconfig eth1
> eth1  Link encap:Ethernet  HWaddr 00:11:25:57:8B:2D
>UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>RX packets:10658057 errors:0 dropped:0 overruns:0 frame:0
>TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>collisions:0 txqueuelen:1000
>RX bytes:1169901971 (1115.7 Mb)  TX bytes:0 (0.0 b)
>Base address:0x3400 Memory:d024-d026
>
> # dmesg |grep eth1
> ...
> e1000: eth1: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
> #
>
> provided there is a link.
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[CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Anumeha Prasad]

Hi,

I'm currently at CentOS 5.8. After some penetration testing, found some
high severity OpenSSH issues which would require its upgrade. But till
CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
currently using).

Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?

Thanks,
Anumeha
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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Ron Colvin]

Without going to 5.9 you will have unpatched vulnerabilities. With all the 
applicable patches for EL5 you should not have any vulnerabilities due to 
in-channel software from CentOS. That does not mean the vulnerability scanner 
won't find false positives, the key is to get the CVE number of the 
vulnerability and searching for how Red Hat responded to the vulnerability and 
whether you have the CentOS equivalent of that patch. 

Mobile

On Mar 21, 2013, at 7:53 AM, Anumeha Prasad  wrote:

> Hi,
> 
> I'm currently at CentOS 5.8. After some penetration testing, found some
> high severity OpenSSH issues which would require its upgrade. But till
> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
> currently using).
> 
> Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?
> 
> Thanks,
> Anumeha
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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[John R. Dennison]

On Thu, Mar 21, 2013 at 05:23:50PM +0530, Anumeha Prasad wrote:
> I'm currently at CentOS 5.8. After some penetration testing, found some
> high severity OpenSSH issues which would require its upgrade. But till
> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
> currently using).

Most "penetration testing" is done via lackadaisical auditors using
automated tools that are pretty much completely worthless in the real
world using Enterprise Linux as said tools are unaware of backporting
policies.  What "issues" were you informed of?  They did provide you
with CVE references?

> Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?

No, it is not possible to use C6 binary rpms on a C5 system.





John
-- 
As I approve of a youth that has something of the old man in him, so am I
no less pleased with an old man that has something of the youth.  He that
follows this rule may be old in body, but can never be so in mind.

-- Marcus Tullius Cicero (106 BC - 43 BC)


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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[SilverTip257]

On Thu, Mar 21, 2013 at 7:53 AM, Anumeha Prasad wrote:

> Hi,
>
> I'm currently at CentOS 5.8. After some penetration testing, found some
> high severity OpenSSH issues which would require its upgrade. But till
> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
> currently using).
>

Why haven't you updated your entire set of packages to 5.9?
Red Hat will (or maybe already has) release patched packages -- often times
the patches are backported for the software versions RH supports.  Meaning
that just going by the version number of openssh may mislead you.  When in
doubt check the RH Bugzilla and CVE reports.

You could rebuild openssh from source, but moving to CentOS 6 is a better
game plan.


>
> Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?
>

See the information on the CentOS wiki (link below).
http://wiki.centos.org/HowTos/MigrationGuide

I cannot speak for how well these migration steps work as I opt to do a
fresh install and rsync the important data to the new install.


>
> Thanks,
> Anumeha
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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Eero Volotinen]

2013/3/21 Anumeha Prasad :
> Hi,
>
> I'm currently at CentOS 5.8. After some penetration testing, found some
> high severity OpenSSH issues which would require its upgrade. But till
> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
> currently using).

Result of Nessus/Openvas scan? redhat backports security fixes, so
just update to 5.9.

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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Eero Volotinen]

2013/3/21 Ron Colvin :
> Without going to 5.9 you will have unpatched vulnerabilities. With all the 
> applicable patches for EL5 you should not have any vulnerabilities due to 
> in-channel software from CentOS. That does not mean the vulnerability scanner 
> won't find false positives, the key is to get the CVE number of the 
> vulnerability and searching for how Red Hat responded to the vulnerability 
> and whether you have the CentOS equivalent of that patch.
>
> Mobile
>
> On Mar 21, 2013, at 7:53 AM, Anumeha Prasad  wrote:
>
>> Hi,
>>
>> I'm currently at CentOS 5.8. After some penetration testing, found some
>> high severity OpenSSH issues which would require its upgrade. But till
>> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
>> currently using).
>>
>> Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?

also rpm -q --changelog openssh-server might help for looking backported fixes.

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Re: [CentOS] posfix admin issue

[Nikolaos Milas]

On 21/3/2013 11:06 πμ, Austin Einter wrote:

> My question is why it is redirecting wrongly to domain/login.php.
>
>

I would suggest you visit postfixadmin project forum and/or subscribe to 
their mailing list.

Nick

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Re: [CentOS] posfix admin issue

[Banyan He]

It sounds like a php coding problem. You can check the php page first. 
Check at what condition is you will be redirected back to the login 
page. It would be easy. You can send in the php file or give us the 
address where to find the file.

Make sure you have all the conditions match, you will not be directly to 
login page. BTW, some codes will check the existence of the setup files. 
If they do exist, you won't be able to login to the admin page.


Banyan He
Blog: http://www.rootong.com
Email: ban...@rootong.com

On 3/21/2013 5:06 PM, Austin Einter wrote:
> Dear All
> I had successfully installed posfixadmin. I was able to login to postfix
> admin and create email ids etc.
>
> In something broken (not sure which one caused the issue), I am
> experiencing below problem with postfix admin.
>
> 1. I am able to access domain/mailadmin page.
> 2. I can create admin accounts at domain/mailadmin/setup.php
> 3. I can see the admin login page by access
>
> But when I enter my admin mailid, and password (i am 100% sure these are
> correct), it goes to a page domain/login.php and then says "Page not found".
>
> My question is why it is redirecting wrongly to domain/login.php.
>
> Kindly help me.
>
> Please note that I have all other things working like amavisd, dovecot etc,
> I am able to send recv mails for accounts that I created previously.
>
> Regards
> Austin
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Re: [CentOS] Ctrl-Alt-F? bindings broken under xen 3.0.3-142.el5_9.1 / 2.6.18-348.1.1.el5xen?

[Robert Heller]

OK, some more information:

I rebooted to a non-xen kernel (2.6.18-348.1.1.el5), and the problem
remains, so it is not xen or a xen kernel issue.  The machine has an AMD
64-bit processor (AMD Sempron(tm) Processor LE-1300), if that makes any
difference.  I have a LD450 keyboard (DEC VT220 flavored ps2 keyboard).
The keyboard does work: the X server properly intercepts Ctrl-Alt-Fn and
does a proper chvt call.  The *kernel* itself is not handling
Ctrl-Alt-Fn.  (It is handling Ctrl-Alt-Delete, but I suspect that is
something completely different.)

My 32-bit laptop, running kernel 2.6.18-348.1.1.el5 is working just fine
-- the kernel there is properly handling Ctrl-Alt-Fn and switches
between consoles without problems.

Oh, both machines boot to runlevel 3 and I use startx to fire up X (I
loath graphical logins).

At Wed, 20 Mar 2013 13:26:14 -0400 CentOS mailing list  
wrote:

> 
> I am not sure what I did, but for some reason Ctrl-Alt-F? bindings are
> broken on 64-bit xen desktop machine (but not on my laptop (32-bit, no
> xen)).  Both machines are (mostly) up-to-date and running CentOS 5.9. 
> I rarely hop to different Virtual Consoles (eg Ctrl-Alt-F1 ...
> Ctrl-Alt-F7), but today I wanted to go to the main console to watch
> some kernel verbage (I was checking something with hot-swap SATA disk).
> I discovered that I could not switch back to my X11 session
> (Ctrl-Alt-F7)! I did some googling, but did not find anything.  So far
> as I can tell, I can switch to one of the other VT (Ctrl-Alt-Fn) *from*
> VT7 (my X11 session), but cannot then switch to any other VT from
> there, using the Ctrl-Alt-F? key bindings. The chvt command works, but
> the keybindings don't.  It is most strange.  I know this used to work
> (and still does work just fine on my laptop, running much the same
> system, including the same X11 configuration, with the same desktop
> setup (plain fvwm in MWM compatibity mode, same keybindings, etc.). 
> Other than different video cards (and thus different X11 drivers) and
> 32-bit vs 64-bit and with xen virtualization on the 64-bit desktop box,
> the system setups are virtually identical.
> 

-- 
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Deepwoods Software-- http://www.deepsoft.com/
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/\  www.asciiribbon.org   -- against proprietary attachments


 
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Re: [CentOS] posfix admin issue

[Austin Einter]

Dear Banyan
Thanks for input. I checked the log. I found always ssl_error_log is being
written when I am trying to login to postfixadmin and it looks relevant
also. But I do not know how to fix it.


The error log is as below.


[Thu Mar 21 07:08:09 2013] [error] [client 122.178.239.178] PHP Warning:
Unknown: Failed to write session data (memcache). Please verify that the
current setting of session.save_path is correct
(tcp://localhost:11211?persistent=1&weight=1&timeout=1&retry_interval=15)
in Unknown on line 0, referer: *
https://www.netcloudjobs.com/mailadmin/login.php*

I have memcache (memcached demon running in a drupal based environment).

Thanks
-Austin




On Thu, Mar 21, 2013 at 7:15 PM, Banyan He  wrote:

> It sounds like a php coding problem. You can check the php page first.
> Check at what condition is you will be redirected back to the login page.
> It would be easy. You can send in the php file or give us the address where
> to find the file.
>
> Make sure you have all the conditions match, you will not be directly to
> login page. BTW, some codes will check the existence of the setup files. If
> they do exist, you won't be able to login to the admin page.
>
> 
> Banyan He
> Blog: http://www.rootong.com
> Email: ban...@rootong.com
>
>
> On 3/21/2013 5:06 PM, Austin Einter wrote:
>
>> Dear All
>> I had successfully installed posfixadmin. I was able to login to postfix
>> admin and create email ids etc.
>>
>> In something broken (not sure which one caused the issue), I am
>> experiencing below problem with postfix admin.
>>
>> 1. I am able to access domain/mailadmin page.
>> 2. I can create admin accounts at domain/mailadmin/setup.php
>> 3. I can see the admin login page by access
>>
>> But when I enter my admin mailid, and password (i am 100% sure these are
>> correct), it goes to a page domain/login.php and then says "Page not
>> found".
>>
>> My question is why it is redirecting wrongly to domain/login.php.
>>
>> Kindly help me.
>>
>> Please note that I have all other things working like amavisd, dovecot
>> etc,
>> I am able to send recv mails for accounts that I created previously.
>>
>> Regards
>> Austin
>> __**_
>> CentOS mailing list
>> CentOS@centos.org
>> http://lists.centos.org/**mailman/listinfo/centos
>>
>>
>
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Re: [CentOS] posfix admin issue

[Austin Einter]

I just looked at link
http://sourceforge.net/p/postfixadmin/discussion/676076/thread/9eb8a948 ,
it looks a similar issue and it is related session cookie. I checked in my
php.ini and cooki is enabled. Not sure if memcache will create any
problem..,

Hope somebody would have faced this issue previously.., any pointer...

-Austin


On Thu, Mar 21, 2013 at 7:44 PM, Austin Einter wrote:

> Dear Banyan
> Thanks for input. I checked the log. I found always ssl_error_log is being
> written when I am trying to login to postfixadmin and it looks relevant
> also. But I do not know how to fix it.
>
>
> The error log is as below.
>
>
> [Thu Mar 21 07:08:09 2013] [error] [client 122.178.239.178] PHP Warning:
> Unknown: Failed to write session data (memcache). Please verify that the
> current setting of session.save_path is correct
> (tcp://localhost:11211?persistent=1&weight=1&timeout=1&retry_interval=15)
> in Unknown on line 0, referer: *
> https://www.netcloudjobs.com/mailadmin/login.php*
>
> I have memcache (memcached demon running in a drupal based environment).
>
> Thanks
> -Austin
>
>
>
>
> On Thu, Mar 21, 2013 at 7:15 PM, Banyan He  wrote:
>
>> It sounds like a php coding problem. You can check the php page first.
>> Check at what condition is you will be redirected back to the login page.
>> It would be easy. You can send in the php file or give us the address where
>> to find the file.
>>
>> Make sure you have all the conditions match, you will not be directly to
>> login page. BTW, some codes will check the existence of the setup files. If
>> they do exist, you won't be able to login to the admin page.
>>
>> 
>> Banyan He
>> Blog: http://www.rootong.com
>> Email: ban...@rootong.com
>>
>>
>> On 3/21/2013 5:06 PM, Austin Einter wrote:
>>
>>> Dear All
>>> I had successfully installed posfixadmin. I was able to login to postfix
>>> admin and create email ids etc.
>>>
>>> In something broken (not sure which one caused the issue), I am
>>> experiencing below problem with postfix admin.
>>>
>>> 1. I am able to access domain/mailadmin page.
>>> 2. I can create admin accounts at domain/mailadmin/setup.php
>>> 3. I can see the admin login page by access
>>>
>>> But when I enter my admin mailid, and password (i am 100% sure these are
>>> correct), it goes to a page domain/login.php and then says "Page not
>>> found".
>>>
>>> My question is why it is redirecting wrongly to domain/login.php.
>>>
>>> Kindly help me.
>>>
>>> Please note that I have all other things working like amavisd, dovecot
>>> etc,
>>> I am able to send recv mails for accounts that I created previously.
>>>
>>> Regards
>>> Austin
>>> __**_
>>> CentOS mailing list
>>> CentOS@centos.org
>>> http://lists.centos.org/**mailman/listinfo/centos
>>>
>>>
>>
>
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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Leon Fauster]

Am 21.03.2013 um 13:12 schrieb John R. Dennison :
> On Thu, Mar 21, 2013 at 05:23:50PM +0530, Anumeha Prasad wrote:
>> I'm currently at CentOS 5.8. After some penetration testing, found some
>> high severity OpenSSH issues which would require its upgrade. But till
>> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
>> currently using).
> 
> Most "penetration testing" is done via lackadaisical auditors using
> automated tools that are pretty much completely worthless in the real
> world using Enterprise Linux as said tools are unaware of backporting
> policies.  What "issues" were you informed of?  They did provide you
> with CVE references?



for more info check the openssh package deeper:

rpm -q --changelog  openssh

or

rpm -q --changelog  openssh |grep -i cve

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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[Johnny Hughes]

On 03/21/2013 06:53 AM, Anumeha Prasad wrote:
> Hi,
>
> I'm currently at CentOS 5.8. After some penetration testing, found some
> high severity OpenSSH issues which would require its upgrade. But till
> CentOS 5.9 the latest rpm available is openssh-4.3p2-82.el5 (which I'm
> currently using).
>
> Is it fine to upgrade to CentOS 6 rpms while I'm on CentOS 5?

Others have already discussed backporting.  Your scanner needs to
understand RHEL backporting to give you correct results.  See this link
for an explanation of backporting:

https://access.redhat.com/security/updates/backporting/

And this one for a CVE database where you can verify false positives are
actually fixed:

https://access.redhat.com/security/cve/

The answer to your other question is:   No ...

Upgrading within a branch is simple, by design.  CentOS-5 will get
security updates until its EOL in 2017.  You can upgrade any CentOS-5
machine to the latest updates with a simple "yum upgrade" command.  Any
security or other issues you think you have can be verified fixed from
the cve database link above.

But moving to CentOS-6 from CentOS-5 is not easy.  The versions of many
things are much higher in CentOS-6.  You therefore need to save off your
data, do a new install of centos-6, move your date back on and upgrade
it to the newer software.  Some things will upgrade easily (most httpd,
ssh, etc.) ... some things will not convert easily (samba, ldap, php to
name a few).  Enterprise Linux upgrades between major versions
(CentOS-5.x to CentOS-6.x) are complicated and need to be planned and
tested very well, they can not be done by just a simple command.

Thanks,
Johnny Hughes



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Re: [CentOS] posfix admin issue

[Keith Keller]

On 2013-03-21, Austin Einter  wrote:
>
> In something broken (not sure which one caused the issue), I am
> experiencing below problem with postfix admin.

As another poster already commented, unless postfixadmin is part of an
official CentOS repo (and I strongly suspect it is not) you should
instead ask in a forum specific for postfixadmin users.  Not only is
your question offtopic here, but it is much more likely that you will
find useful help there.

http://sourceforge.net/p/postfixadmin/discussion/676076

--keith

-- 
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Re: [CentOS] posfix admin issue

[m . roth]

Austin Einter wrote:
> Dear Banyan
> Thanks for input. I checked the log. I found always ssl_error_log is being
> written when I am trying to login to postfixadmin and it looks relevant
> also. But I do not know how to fix it.
>
> The error log is as below.
>
> [Thu Mar 21 07:08:09 2013] [error] [client 122.178.239.178] PHP Warning:
> Unknown: Failed to write session data (memcache). Please verify that the
> current setting of session.save_path is correct
> (tcp://localhost:11211?persistent=1&weight=1&timeout=1&retry_interval=15)
> in Unknown on line 0, referer: *
> https://www.netcloudjobs.com/mailadmin/login.php*
>
> I have memcache (memcached demon running in a drupal based environment).

Is there a firewall issue?

  mark

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[CentOS] GFS2 hangs after one node going down

[Maurizio Giungato]

Hi guys,

my goal is to create a reliable virtualization environment using CentOS 
6.4 and KVM, I've three nodes and a clustered GFS2.

The enviroment is up and working, but I'm worry for the reliability, if 
I turn the network interface down on one node to simulate a crash (for 
example on the node "node6.blade"):

1) GFS2 hangs (processes go in D state) until node6.blade get fenced
2) not only node6.blade get fenced, but also node5.blade!

Help me to save my last neurons!

Thanks
Maurizio
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[CentOS] dhcpd options

[m . roth]

A few weeks ago, suddenly, reading news at lunch, I could not get to
nytimes.com. I could ping it, and nslookup it, and if I put the IP address
in place of the name, it was fine.

After *much* back and forth over a ticket I put in, over the last week or
so, our group figured it out: It *seemed* to be related to IPv6, and
there's only *some* few sites, such as the Times, and Orbits, and one or
two others I found, while, say, the Washington Post, or Huffpo, etc, were
fine; and I could make it work by putting IPV6INIT="no" in ifcfg-eth0 and
restarting the network, but another admin got it nailed, we *think*:
apparently the M$-based DNS resolver's sending back extended DNS packets,
and we gag. tcpdump saw us asking for an A record, then an  record,
then using search

But putting the *very* counterintuitive option edns0 in /etc/resolv.conf,
it works instantly, no caching, no nuthin'. Taking that out breaks it
again.

My question: it *appears* that we could add
option edns0
to dhcpd.conf on the server, and it would fix it for everyone on our subnet.

Have I misunderstood what I'm reading in the manpages?

mark

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Re: [CentOS] Is it fine to upgrade to Centos 6 rpms, being at centos 5.8

[John R Pierce]

On 3/21/2013 5:12 AM, John R. Dennison wrote:
> Most "penetration testing" is done via lackadaisical auditors using
> automated tools that are pretty much completely worthless in the real
> world using Enterprise Linux as said tools are unaware of backporting
> policies.

indeed, they are automated checklist checkers.

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Re: [CentOS] dhcpd options

[m . roth]

m.r...@5-cent.us wrote:
> A few weeks ago, suddenly, reading news at lunch, I could not get to
> nytimes.com. I could ping it, and nslookup it, and if I put the IP address
> in place of the name, it was fine.
>
> After *much* back and forth over a ticket I put in, over the last week or
> so, our group figured it out: It *seemed* to be related to IPv6, and
> there's only *some* few sites, such as the Times, and Orbits, and one or
> two others I found, while, say, the Washington Post, or Huffpo, etc, were
> fine; and I could make it work by putting IPV6INIT="no" in ifcfg-eth0 and
> restarting the network, but another admin got it nailed, we *think*:
> apparently the M$-based DNS resolver's sending back extended DNS packets,
> and we gag. tcpdump saw us asking for an A record, then an  record,
> then using search
>
> But putting the *very* counterintuitive option edns0 in /etc/resolv.conf,
> it works instantly, no caching, no nuthin'. Taking that out breaks it
> again.
>
> My question: it *appears* that we could add
> option edns0
> to dhcpd.conf on the server, and it would fix it for everyone on our
> subnet.
>
> Have I misunderstood what I'm reading in the manpages?
>
Sorry, missed some info: CentOS 6.4

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Re: [CentOS] dhcpd options (related)

[m . roth]

m.r...@5-cent.us wrote:
> m.r...@5-cent.us wrote:
>> A few weeks ago, suddenly, reading news at lunch, I could not get to
>> nytimes.com. I could ping it, and nslookup it, and if I put the IP
>> address in place of the name, it was fine.
>>
>> After *much* back and forth over a ticket I put in, over the last week
>> or so, our group figured it out: It *seemed* to be related to IPv6, and
>> there's only *some* few sites, such as the Times, and Orbits, and one or
>> two others I found, while, say, the Washington Post, or Huffpo, etc,
>> were fine; and I could make it work by putting IPV6INIT="no" in ifcfg-eth0
>> and restarting the network, but another admin got it nailed, we *think*:
>> apparently the M$-based DNS resolver's sending back extended DNS
>> packets, and we gag. tcpdump saw us asking for an A record, then an
 record, then using search
>>
>> But putting the *very* counterintuitive option edns0 in
>> /etc/resolv.conf,
>> it works instantly, no caching, no nuthin'. Taking that out breaks it
>> again.
>>
Hate to follow myself up, but here's another question: is it possible that
th3e IPV6INIT="yes" in ifcfg-eth0 sets the networking into a state where
it's sending *out* an edns query record, but doesn't understand the reply
edns record, until we tell it to with option edns0?

mark

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[CentOS] updating to 6.4 broke olvwm/openwin

[Miranda Hawarden-Ogata]

This morning a handful of workstations got upgraded from 6.3 to 6.4 and 
things seemed to be functional, until we tried to log in to one of our 
instrument accounts that for various reasons uses olvwm/openwin as the 
desktop (and no, I don't have the option of changing that at this time). 
The desktop appears to load correctly, and mouse-focus and clicking 
appears to work, but the .openwin-menu entries no longer function other 
than clicking "exit" to log out of the session. I've tried reinstalling 
xview and xview-client rpms, but that doesn't resolve it. I don't think 
it's an issue with the user account, as the underlying commands work 
when I su and execute them in an xterm. I was also able to reproduce the 
problem on three separate computers.

I don't usually have to deal with these desktop issues so I'm hella 
rusty when it comes to debugging them. Does anyone have any tidbits to 
point me in the right direction to fix this? (Hopefully soon, since we 
are supposed to use this account for observations tonight)

-- 
Thanks!
Miranda

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Re: [CentOS] updating to 6.4 broke olvwm/openwin

[m . roth]

Miranda Hawarden-Ogata wrote:
> This morning a handful of workstations got upgraded from 6.3 to 6.4 and
> things seemed to be functional, until we tried to log in to one of our
> instrument accounts that for various reasons uses olvwm/openwin as the
> desktop (and no, I don't have the option of changing that at this time).
> The desktop appears to load correctly, and mouse-focus and clicking
> appears to work, but the .openwin-menu entries no longer function other
> than clicking "exit" to log out of the session. I've tried reinstalling
> xview and xview-client rpms, but that doesn't resolve it. I don't think
> it's an issue with the user account, as the underlying commands work
> when I su and execute them in an xterm. I was also able to reproduce the
> problem on three separate computers.
>
> I don't usually have to deal with these desktop issues so I'm hella
> rusty when it comes to debugging them. Does anyone have any tidbits to
> point me in the right direction to fix this? (Hopefully soon, since we
> are supposed to use this account for observations tonight)

Could there be a) a permission problem; b) is selinux enabled? c) how are
the home directories mounted (I assume that/s where the .openwin-menu
files are).

Observatory? Kek? Mauna Kea?

mark

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Re: [CentOS] updating to 6.4 broke olvwm/openwin

[Miranda Hawarden-Ogata]

On 2013/03/21 11:18, m.r...@5-cent.us wrote:
> Miranda Hawarden-Ogata wrote:
>> This morning a handful of workstations got upgraded from 6.3 to 6.4 and
>> things seemed to be functional, until we tried to log in to one of our
>> instrument accounts that for various reasons uses olvwm/openwin as the
>> desktop (and no, I don't have the option of changing that at this time).
>> The desktop appears to load correctly, and mouse-focus and clicking
>> appears to work, but the .openwin-menu entries no longer function other
>> than clicking "exit" to log out of the session. I've tried reinstalling
>> xview and xview-client rpms, but that doesn't resolve it. I don't think
>> it's an issue with the user account, as the underlying commands work
>> when I su and execute them in an xterm. I was also able to reproduce the
>> problem on three separate computers.
>>
>> I don't usually have to deal with these desktop issues so I'm hella
>> rusty when it comes to debugging them. Does anyone have any tidbits to
>> point me in the right direction to fix this? (Hopefully soon, since we
>> are supposed to use this account for observations tonight)
> Could there be a) a permission problem; b) is selinux enabled? c) how are
> the home directories mounted (I assume that/s where the .openwin-menu
> files are).
>
> Observatory? Kek? Mauna Kea?
>
>  mark
>
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>
Keck?!? Heck no! X__X LOL! Nope, we're right next door: IRTF.

a) permission problem: permission on what? .openwin-menu? .openwin-menu 
hasn't changed since 2008, .openwin-init since 2006... I haven't changed 
anything other than do "yum upgrade" and the problem is affecting all 
accounts that use openwin, across every machine that got upgraded.

b) selinux: disabled

c) home directories are automounted via nfs, v3 I believe. And 
.openwin-menu is indeed in /home/acct/.

Thanks!
Miranda

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Re: [CentOS] updating to 6.4 broke olvwm/openwin

[Johnny Hughes]

On 03/21/2013 04:06 PM, Miranda Hawarden-Ogata wrote:
> This morning a handful of workstations got upgraded from 6.3 to 6.4 and 
> things seemed to be functional, until we tried to log in to one of our 
> instrument accounts that for various reasons uses olvwm/openwin as the 
> desktop (and no, I don't have the option of changing that at this time). 
> The desktop appears to load correctly, and mouse-focus and clicking 
> appears to work, but the .openwin-menu entries no longer function other 
> than clicking "exit" to log out of the session. I've tried reinstalling 
> xview and xview-client rpms, but that doesn't resolve it. I don't think 
> it's an issue with the user account, as the underlying commands work 
> when I su and execute them in an xterm. I was also able to reproduce the 
> problem on three separate computers.
>
> I don't usually have to deal with these desktop issues so I'm hella 
> rusty when it comes to debugging them. Does anyone have any tidbits to 
> point me in the right direction to fix this? (Hopefully soon, since we 
> are supposed to use this account for observations tonight)

There is a newer version of xorg-x11-server with 6.4 ... maybe you need
to recompile your window manager with the newer devel files.



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[CentOS] ntfsprogs update probs anyone?

[Phil Savoie]

Hi All,

Not sure I understand the error message:

yum update
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
  * base: less.cogeco.net
  * elrepo: elrepo.org
  * extras: centos.mirror.rafal.ca
  * rpmforge: mirror.cpsc.ucalgary.ca
  * updates: centos.mirror.rafal.ca
Setting up Update Process
Resolving Dependencies
--> Running transaction check
---> Package fuse-ntfs-3g.x86_64 0:2010.10.2-1.el6.rf will be updated
---> Package fuse-ntfs-3g.x86_64 0:2013.1.13-1.el6.rf will be an update
---> Package ntfsprogs.x86_64 0:1.13.1-1.el6.rf will be obsoleted
--> Processing Dependency: ntfsprogs = 1.13.1-1.el6.rf for package: 
gnome-vfs2-ntfs-1.13.1-1.el6.rf.x86_64
---> Package ntfsprogs.x86_64 0:2013.1.13-1.el6.rf will be obsoleting
---> Package rpmforge-release.x86_64 0:0.5.2-2.el6.rf will be updated
---> Package rpmforge-release.x86_64 0:0.5.3-1.el6.rf will be an update
--> Finished Dependency Resolution
Error: Package: gnome-vfs2-ntfs-1.13.1-1.el6.rf.x86_64 (@rpmforge)
Requires: ntfsprogs = 1.13.1-1.el6.rf
Removing: ntfsprogs-1.13.1-1.el6.rf.x86_64 (@rpmforge)
ntfsprogs = 1.13.1-1.el6.rf
Obsoleted By: ntfsprogs-2013.1.13-1.el6.rf.x86_64 (rpmforge)
ntfsprogs = 2013.1.13-1.el6.rf
  You could try using --skip-broken to work around the problem
  You could try running: rpm -Va --nofiles --nodigest

But rpm -q reports:

rpm -q gnome-vfs2 ntfsprogs
gnome-vfs2-2.24.2-6.el6.x86_64
ntfsprogs-1.13.1-1.el6.rf.x86_64

Please, what is the problem?

Thank you,

Phil

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[CentOS] CentOS 6.4 x86_64 VM Install freezes

[Robert Heller]

I am trying to install a CentOS 6.4 x86_64 VM using a CentOS 5.9 x86_64
host, but its install has froze *twice*. What I am doing is to create a
10gig LVM volume, which I put a MS-DOS partition table on (using fdisk).
I then format the only partition to ext3, install grub and install the
pxeboot kernel and initrd.img and a simple grub.conf to load this.

I have the CentOS 6.4 x86_64 ISOs mounted (via loop) and exported as NFS file
systems:

/distrocds/CentOS/6.4/CentOS-6.4-i386-bin-DVD1.iso
  3.6G  3.6G 0 100% /centos64i386/1
/distrocds/CentOS/6.4/CentOS-6.4-i386-bin-DVD2.iso
  1.1G  1.1G 0 100% /centos64i386/2
/distrocds/CentOS/6.4/CentOS-6.4-x86_64-bin-DVD1.iso
  4.1G  4.1G 0 100% /centos64x86_64/1
/distrocds/CentOS/6.4/CentOS-6.4-x86_64-bin-DVD2.iso
  1.4G  1.4G 0 100% /centos64x86_64/2
sauron.deepsoft.com% sudo exportfs
/centos64x86_64/1
192.168.250.0/255.255.255.0
/centos64x86_64/2
192.168.250.0/255.255.255.0
/centos64i386/1
192.168.250.0/255.255.255.0
/centos64i386/2
192.168.250.0/255.255.255.0

I am able to boot up the installer and have it NFS mount the first DVD
and things go fine util it installs
selinux-policy-targeted-3.7.19-195.el6.noarch.  The VM is busy for a
while, then the CPU usage goes to zero and it just sits there.

What am I doing wrong?

This worked just fine with the 32-bit version of CentOS 6.4.

Is it because some package from the second disk is needed?  Do I have to
create a merged version of the DVDs?  Or is something else wrong?

Screenshot available here:
http://www.deepsoft.com/wp-content/uploads/2013/03/FrozenInstallx86_64.png

And the VM's defination is here:
http://www.deepsoft.com/wp-content/uploads/2013/03/c664guest.xml


-- 
Robert Heller -- 978-544-6933 / hel...@deepsoft.com
Deepwoods Software-- http://www.deepsoft.com/
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/\  www.asciiribbon.org   -- against proprietary attachments


   
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Re: [CentOS] ntfsprogs update probs anyone?

[John R Pierce]

On 3/21/2013 3:34 PM, Phil Savoie wrote:
> Error: Package: gnome-vfs2-ntfs-1.13.1-1.el6.rf.x86_64 (@rpmforge)
>  Requires: ntfsprogs = 1.13.1-1.el6.rf
>  Removing: ntfsprogs-1.13.1-1.el6.rf.x86_64 (@rpmforge)
>  ntfsprogs = 1.13.1-1.el6.rf
>  Obsoleted By: ntfsprogs-2013.1.13-1.el6.rf.x86_64 (rpmforge)

thats all rpmforge stuff.   ask them.


-- 
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Re: [CentOS] CentOS 6.4 x86_64 VM Install freezes

[John R Pierce]

On 3/21/2013 3:42 PM, Robert Heller wrote:
> Is it because some package from the second disk is needed?  Do I have to
> create a merged version of the DVDs?  Or is something else wrong?



I put a mirror of this, http://mirror.centos.org/centos-6/6/os/x86_64/ 
on a local http server

then I use the netinstall iso to boot the system or VM and have the 
kickstart file point to the http url to run the install.   if you do a 
pxe boot of the netinstall image, even better.


-- 
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[CentOS] CentOS 6.x

[Kaushal Shriyan]

Hi

Please help me understand to choose between the two versions CentOS 6.3 and
CentOS 6.4. I am not sure to choose 6.4 since it is being released
recently(
http://lists.centos.org/pipermail/centos-announce/2013-March/019276.html)
and it may be risky to push it in Live environment.

Regards,

Kaushal
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Re: [CentOS] CentOS 6.4 on Dell R320 64 Bit.

[Kaushal Shriyan]

On Wed, Mar 20, 2013 at 8:19 AM, Kaushal Shriyan
wrote:

> Hi,
>
> I have installed CentOS 6.4 on Dell Server R320 64bit with UEFI BIOS. Do i
> need both /boot and /boot/efi partitions. Please help me understand the
> difference between these.
>
> Regards,
>
> Kaushal
>

Hi,

checking in again regarding my earlier post to this mailing list?

Regards,

Kaushal
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Re: [CentOS] CentOS 6.x

[Keith Keller]

On 2013-03-22, Kaushal Shriyan  wrote:
>
> Please help me understand to choose between the two versions CentOS 6.3 and
> CentOS 6.4. I am not sure to choose 6.4 since it is being released
> recently(
> http://lists.centos.org/pipermail/centos-announce/2013-March/019276.html)
> and it may be risky to push it in Live environment.

It is likely not.  The point releases are all basically patches--mostly
security and bug fixes, a few minor new features--to CentOS 6, which
are equivalent to patches to the upstream distro by the vendor.  If
you're choosing between a new install of 6.3 or 6.4 you should
definitely choose 6.4.

--keith

-- 
kkel...@wombat.san-francisco.ca.us


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Re: [CentOS] raid 1 question

[Dave Johansen]

On Tue, Mar 12, 2013 at 5:04 PM, SilverTip257 
wrote:
>
> On Tue, Mar 12, 2013 at 1:28 PM, Dave Johansen
> wrote:
>
> > On Fri, Mar 8, 2013 at 6:14 AM, SilverTip257 
> > wrote:
> > >
> > > On Thu, Mar 7, 2013 at 6:54 PM, Gerry Reno  wrote:
> > >
> > > > On 03/07/2013 06:52 PM, Les Mikesell wrote:
> > > > > On Thu, Mar 7, 2013 at 5:40 PM, John R Pierce
> > > > > 
> > > > wrote:
> > > > >> On 3/7/2013 3:35 PM, Gerry Reno wrote:
> > > > >>> Dave,  I've been using software raid with every type of RedHat
> > distro
> > > > RH/CentOS/Fedora for over 10 years without any
> > > > >>> serious difficulties.  I don't quite understand the logic in all
> > these
> > > > negative statements about software raid on that
> > > > >>> wiki page.  The worst I get into is I have to boot from a
> > > > >>> bootdisk
> > if
> > > > the MBR gets corrupted for any reason.  No big
> > > > >>> deal.  Just rerun grub.
> > > > >> have you been putting /boot on a mdraid?  that's what the article
> > > > >> is
> > > > >> recommending against.
> > > > > I've put /boot on md  raid1 on a lot of machines (always drives
> > > > > small
> > > > > enough to be MBR based) and never had any problem with the
> > > > > partition
> > > > > looking enough like a native one for grub to boot it.  The worst
> > thing
> > > >
> > >
> > > No problems here either - I have had /boot on software raid1 on quite
> > > a
> > few
> > > systems past and present.
> > >
> > >
> > > > > I've seen about it is that some machines change their idea of bios
> > > >
> > >
> > > If I do have a drive fail, I can frequently hot-remove them and
> > > hot-add
> > the
> > > replacement drive to get it resyncing without powering off.
> > >
> > >
> > > > > disk 0 and 1 when the first one fails, so your grub setup might be
> > > > > wrong even after you do it on the 2nd disk - and that would be the
> > > > > same with/without raid.   As long as you are prepared to boot from
> > > > > a
> > > > > rescue disk you can fix it easily anyway.
> > > > >
> > > > Good point, Les.   Rescue disks and bootdisks are key and critical
> > > > if
> > > > you're going to use software raid.
> > > >
> > > >
> > > I think we could argue that rescue disks are a necessity regardless
> > > one
> > is
> > > using software raid or not.  :)
> >
> > Thanks for all of the helpful info, and now I have a follow on
> > question. I have a Dell m6500 that I've been running as a RAID 1 using
> > the BIOS RAID on RHEL 5. The issue is that when you switch one of the
> > drives, the BIOS renames the RAID and then RHEL 5 doesn't recognize it
> > anymore. So here are my questions:
> >
> > 1) Has this issue of handling the renaming been resolved in RHEL 6?
> > (my guess is no)
> >
>
> I've not seen any weird bios naming issues.

It's an Intel Software RAID and whenever either of the drives are
switched, the system won't boot at all because it says it can't find
the device. I end up having to boot to a rescue disk and then manually
edit the init image to get it to boot.

>
>
> > 2) Would a software RAID be a better choice than using the BIOS RAID?
> >
>
> It depends!  In another thread on this list someone said they prefer the
> reliable Linux toolset over the manufacturer tools/RAID controllers.
>
> In a way it comes down to what you can afford and what you are comfortable
> with.
> And then there are chips on the hardware RAID controllers on which the
> RAID
> operations are offloaded.
>
>
> > 3) If a software RAID is the better choice, are there going to be an
> > impact on performance/stability/etc?
> >
>
> Supposedly hardware RAID performs better.  I've not done any tests to
> quantify this statement I've heard others make.
>
> Since it's software RAID, the OS will be using a few CPU cycles to handle
> the softraid.  But I'll doubt you'll miss those CPU cycles ... I haven't
> and I have a mix of hardware raid and software raid systems.  In the end
> that it will come down to drive performance in terms of how many IOPS you
> can squeeze out of your drives.
>
> Make certain to set up checks for your array health and disk health
> (smartd).  If you use hardware raid many controllers don't allow directly
> accessing the drives with smartctl ... you have to use a vendor
> binary/utility (or open source one if available).
>
> And then there's aligning your hardware RAID boundaries... [0] [1]  :)
>
> [0]
>
> http://www.mysqlperformanceblog.com/2011/06/09/aligning-io-on-a-hard-disk-raid-the-theory/
> [1]
>
> http://www.mysqlperformanceblog.com/2011/12/16/setting-up-xfs-the-simple-edition/

Thanks to everyone for all the info and help. It sounds like the best
solution is a software RAID with /boot being a non-RAID partition and
then being rsynced on to the second drive, so I'll give that a whirl.

Thanks again,
Dave
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Re: [CentOS] Ctrl-Alt-F? bindings broken under xen 3.0.3-142.el5_9.1 / 2.6.18-348.1.1.el5xen?

[Cliff Pratt]

The graphics chip is probably relevant. FWIW I can't Ctrl-Alt-Fn to
any Virtual Console (I just get a black screen, no login prompt). I
have a nVidia graphics chip. There are many reports on the Internet of
trouble with VC and nVidia and some other graphics chips.

Cheers,

Cliff

On Fri, Mar 22, 2013 at 2:52 AM, Robert Heller  wrote:
> OK, some more information:
>
> I rebooted to a non-xen kernel (2.6.18-348.1.1.el5), and the problem
> remains, so it is not xen or a xen kernel issue.  The machine has an AMD
> 64-bit processor (AMD Sempron(tm) Processor LE-1300), if that makes any
> difference.  I have a LD450 keyboard (DEC VT220 flavored ps2 keyboard).
> The keyboard does work: the X server properly intercepts Ctrl-Alt-Fn and
> does a proper chvt call.  The *kernel* itself is not handling
> Ctrl-Alt-Fn.  (It is handling Ctrl-Alt-Delete, but I suspect that is
> something completely different.)
>
> My 32-bit laptop, running kernel 2.6.18-348.1.1.el5 is working just fine
> -- the kernel there is properly handling Ctrl-Alt-Fn and switches
> between consoles without problems.
>
> Oh, both machines boot to runlevel 3 and I use startx to fire up X (I
> loath graphical logins).
>
> At Wed, 20 Mar 2013 13:26:14 -0400 CentOS mailing list  
> wrote:
>
>>
>> I am not sure what I did, but for some reason Ctrl-Alt-F? bindings are
>> broken on 64-bit xen desktop machine (but not on my laptop (32-bit, no
>> xen)).  Both machines are (mostly) up-to-date and running CentOS 5.9.
>> I rarely hop to different Virtual Consoles (eg Ctrl-Alt-F1 ...
>> Ctrl-Alt-F7), but today I wanted to go to the main console to watch
>> some kernel verbage (I was checking something with hot-swap SATA disk).
>> I discovered that I could not switch back to my X11 session
>> (Ctrl-Alt-F7)! I did some googling, but did not find anything.  So far
>> as I can tell, I can switch to one of the other VT (Ctrl-Alt-Fn) *from*
>> VT7 (my X11 session), but cannot then switch to any other VT from
>> there, using the Ctrl-Alt-F? key bindings. The chvt command works, but
>> the keybindings don't.  It is most strange.  I know this used to work
>> (and still does work just fine on my laptop, running much the same
>> system, including the same X11 configuration, with the same desktop
>> setup (plain fvwm in MWM compatibity mode, same keybindings, etc.).
>> Other than different video cards (and thus different X11 drivers) and
>> 32-bit vs 64-bit and with xen virtualization on the 64-bit desktop box,
>> the system setups are virtually identical.
>>
>
> --
> Robert Heller -- 978-544-6933 / hel...@deepsoft.com
> Deepwoods Software-- http://www.deepsoft.com/
> ()  ascii ribbon campaign -- against html e-mail
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>
>
>
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Re: [CentOS] CentOS 6.x

[zGreenfelder]

>On Thu, Mar 21, 2013 at 9:42 PM, Keith Keller 
> wrote:
> On 2013-03-22, Kaushal Shriyan  wrote:
>>
>> Please help me understand to choose between the two versions CentOS 6.3 and
>> CentOS 6.4. I am not sure to choose 6.4 since it is being released
>> recently(
>> http://lists.centos.org/pipermail/centos-announce/2013-March/019276.html)
>> and it may be risky to push it in Live environment.
>
> It is likely not.  The point releases are all basically patches--mostly
> security and bug fixes, a few minor new features--to CentOS 6, which
> are equivalent to patches to the upstream distro by the vendor.  If
> you're choosing between a new install of 6.3 or 6.4 you should
> definitely choose 6.4.
>

+1; unless you have a specific reason to go to 6.3 instead of 6.4
(e.g. a vendor doesn't support 6.4 and you'll break support contracts
or something along those lines), I can't really think of a compelling
reason to not use 6.4
-- 
Even the Magic 8 ball has an opinion on email clients: Outlook not so good.
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