Re: [CentOS] Emacs 24 on CentOS 6.4

[Carson Chittom]

On Tue, 2013-11-19 at 09:45 +0300, Mihamina RKTMB wrote:
> On 11/19/2013 03:45 AM, Carson Chittom wrote:
> > After a brief effort, I didn't get it to work.
> >
> > [...]
> > So I again attempted to compile the emacs-24.2 SRPM, but apparently the
> > version of autoconf (2.63) in CentOS was too low (the emacs SRPM
> > expected 2.69), which caused the build to fail.
> 
> My personal opinion is you should change you distribution if you want 
> "bleeding edge" sofwtares.
> CentOS seems not fit this game.
> 

Emacs 24 is not "bleeding edge."  It is a released product.  Version
24.1 was released June 10, 2012.

Incidentally, it's not exactly friendly to new users who ask "How do I
do x?" to reply "Go away; you're not wanted."  Trust me to know my own
needs better than you do.


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Re: [CentOS] maximum number of mounts

[Rita]

Thanks for the response.

I am using TCP mounts. The reason for 400 mounts is because we have several
hundred storage servers and use automount to mount them up.  The data is
scattered all over the place thus the extremely large mounts.


On Tue, Nov 19, 2013 at 1:50 AM, Mihamina RKTMB  wrote:

> On 11/17/2013 08:58 PM, Rita wrote:
> > What is the maximum number of NFS mounts per client? I have an instance
> > where there are over 400 mount points using autofs. I was wondering if
> > there is a downside to that.
>
> Except the network load, I think you'll just have the same issues you
> basically encounter with NFS.
> But, may be if you feed with actual problems...
>
> For curiosity: What's the use case of having 400 NFS mounts? Are you
> using TCP? UDP?
>
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Re: [CentOS] Emacs 24 on CentOS 6.4

[m . roth]

Carson Chittom wrote:
> On Tue, 2013-11-19 at 09:45 +0300, Mihamina RKTMB wrote:
>> On 11/19/2013 03:45 AM, Carson Chittom wrote:
>> > After a brief effort, I didn't get it to work.
>> >
>> > [...]
>> > So I again attempted to compile the emacs-24.2 SRPM, but apparently
>> > the version of autoconf (2.63) in CentOS was too low (the emacs SRPM
>> > expected 2.69), which caused the build to fail.
>>
>> My personal opinion is you should change you distribution if you want
>> "bleeding edge" sofwtares. CentOS seems not fit this game.
>
> Emacs 24 is not "bleeding edge."  It is a released product.  Version
> 24.1 was released June 10, 2012.

I'm coming in late to this, and have missed the beginning... but beg
pardon, but released in what form? From the folks who develop it? CentOS,
like upstream, is usually several years behind the "current" version on
much software, though bug and security fixes are backported.

Where did you get the SRPM? It sounds as though it was *not* from one of
the std. CentOS repos; if repoforge, then note that I have, more than
once, seen dependency conflicts, as has my manager (who was here long
before me), and so we do *not* consider that as a std. repo.
>
> Incidentally, it's not exactly friendly to new users who ask "How do I
> do x?" to reply "Go away; you're not wanted."  Trust me to know my own
> needs better than you do.

Much cutting edge isn't here, either. The thing we're big on is
STABILITY!!!. And this wasn't "you're not wanted", it's "I suspect that
what we have as current won't meet your needs".

Perhaps you might want to try fedora (not anywhere I want to go, but as
you say, you know your own needs better than we do).

  mark

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Re: [CentOS] maximum number of mounts

[m . roth]

Rita wrote:
> On Tue, Nov 19, 2013 at 1:50 AM, Mihamina RKTMB 
> wrote:
>> On 11/17/2013 08:58 PM, Rita wrote:
>> > What is the maximum number of NFS mounts per client? I have an
>> > instance where there are over 400 mount points using autofs. I was
wondering if
>> > there is a downside to that.
>>
>> Except the network load, I think you'll just have the same issues you
>> basically encounter with NFS. But, may be if you feed with actual
problems...
>>
>> For curiosity: What's the use case of having 400 NFS mounts? Are you
>> using TCP? UDP?

> Thanks for the response.
>
> I am using TCP mounts. The reason for 400 mounts is because we have
> several hundred storage servers and use automount to mount them up.  The
data is
> scattered all over the place thus the extremely large mounts.

May I ask how *big* all those storage servers are? If you're not talking
tens of terabytes or more, you might consider a honkin' big RAID box, with
one or two servers controlling it and serving (and maybe even 10GB pipes;
gigabit pipes at a bare-bones minimum. It'd use a lot less energy, cost
less, and be lower maintenance.

For example, AC&NC sells one, holds 42 2TB drives, and cost just over $32k.

mark "can't *imagine* how I'd know that"*

* No, I don't work for them. Like the product.

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Re: [CentOS] vpn client setup/plugin

[Wes James]

On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB  wrote:
>
> On 11/19/2013 07:31 AM, Wes James wrote:
> > I'm trying to find the correct vpn plugin so I can vpn in to a server.
 The
> > server requirements are vpn server, username/password and shared secret.
>
> You need to know what kind of VPN you're dealing with: OpenVPN? IPSec?
> whatever?
>

It is a L2TP/IPSec server.

-wes
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Re: [CentOS] Emacs 24 on CentOS 6.4

[Tru Huynh]

On Mon, Nov 18, 2013 at 06:45:39PM -0600, Carson Chittom wrote:
> ...
> So I again attempted to compile the emacs-24.2 SRPM, but apparently the
> version of autoconf (2.63) in CentOS was too low (the emacs SRPM
> expected 2.69), which caused the build to fail.  
> 
> If anyone's curious, I have placed a log of the build at
> http://www.wistly.net/emacs-build.log

Hi,

1) for a quick and dirty solution, I would manually build/install autoconf
>=2.68 on the side (./configure --prefix=/opt/autoconf/2.68) , modify the
builder default PATH to have the new autoconf first, and rebuid your emacs
version.

or
2) also rebuild autoconf from fc19, replace the CentOS version during the 
rebuild stage, revert to the stock autoconf.

either way, you will end up maintaining emacs24 for the next years :)

Cheers,

Tru

-- 
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Re: [CentOS] vpn client setup/plugin

[John Doe]

From: Wes James 

> On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB  
>> I'm trying to find the correct vpn plugin so I can vpn in to a 
>> server.
>> The server requirements are vpn server, username/password and shared 
>> secret.
> It is a L2TP/IPSec server.

Google seems to say to install openswan + xl2tpd (from epel repository).

JD
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[CentOS] CentOS LiveCD on USB

[Glenn Eychaner]

I have been following these instructions:
https://www.centos.org/forums/viewtopic.php?t=501
to put a bunch of utilities (Clonezilla, SystemRescue, CentOS 
netinstall/rescue, etc.)
on a single USB key.  It works great for everything (including Ubuntu Live) 
except the
CentOS 6.4 LiveCD. (You can see my postings at the bottom of the forum.) When
booting the LiveCD, I got:
Kernel panic - not syncing: Attempted to kill init!
Pid: 1, comm: init Not tainted 2.6.32-358.el6.i686 #1
After removing "quiet" and adding "selinux=disabled", I got more information; 
the boot
stalls after finding devices, and gives:
No root device "block:/dev/mapper/live-rw" found
dracut suggests adding "rdshell", which I did.  This was not helpful (I had no 
idea what
to do in the dracut shell), but did notice that in the dracut shell /dev/ did 
NOT seem to
contain my USB drive at /dev/sdb as I would expect. (One reason it seemeed not
helpful) So:
1) I used VFAT rather than ext2/3/4. Do I have to use ext2/3/4?
2) Do I need to rebuild the initramfs file somewhere in the CentOS LiveCD 
directory?
3) Is this just a straight-up hardware incompatibility? The computer is a 
brand-new
SuperMicro X10SAE Haswell system.

Thanks,
-G.
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Re: [CentOS] CentOS LiveCD on USB

[m . roth]

Glenn Eychaner wrote:
> I have been following these instructions:
> https://www.centos.org/forums/viewtopic.php?t=501
> to put a bunch of utilities (Clonezilla, SystemRescue, CentOS
> netinstall/rescue, etc.) on a single USB key.  It works great for
everything (including
> Ubuntu Live) except the CentOS 6.4 LiveCD. (You can see my postings at
the bottom of
> the forum.) When booting the LiveCD, I got:
>   Kernel panic - not syncing: Attempted to kill init!
>   Pid: 1, comm: init Not tainted 2.6.32-358.el6.i686 #1
> After removing "quiet" and adding "selinux=disabled", I got more

Get rid of rhgb, too.

> information; the boot stalls after finding devices, and gives:
>   No root device "block:/dev/mapper/live-rw" found
> dracut suggests adding "rdshell", which I did.  This was not helpful (I
> had no idea what to do in the dracut shell), but did notice that in the
dracut

> shell /dev/ did NOT seem to contain my USB drive at /dev/sdb as I would
expect.

When you boot from a USB key, it always shows as /dev/sda. Second, rdshell
is a grub shell.

Are you trying to boot from the USB? If so, I'd fix the grub menu on that,
if it's on /dev/sda1 of the flash drive, to use /dev/sda2 for the root=

mark

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Re: [CentOS] vpn client setup/plugin

[Wes James]

On Tue, Nov 19, 2013 at 8:31 AM, John Doe  wrote:

> From: Wes James 
>
> > On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB 
> >> I'm trying to find the correct vpn plugin so I can vpn in to a
> >> server.
> >> The server requirements are vpn server, username/password and shared
> >> secret.
> > It is a L2TP/IPSec server.
>
> Google seems to say to install openswan + xl2tpd (from epel repository).
>
> JD
>

OK Thanks.  I'll try that.

-wes
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Re: [CentOS] CentOS LiveCD on USB

[Glenn Eychaner]

I had already gotten rid of rghb. The grub2 entry on the key for booting the
LiveCD reads:

menuentry "CentOS 6.4 Live" {
set root=(hd0,1)
linux /CentOS-Live/isolinux/vmlinuz0 root=UUID=A352-6D7C ro liveimg nodiskmount 
nolvmmount selinux=disabled live_dir=/CentOS_Live/LiveOS
initrd /CentOS-Live/isolinux/initrd0.img
}

The contents of the LiveCD appear in /CentOS_Live as one would expect. The
boot fails right after a device scan (obvious by tens of lines listing "ataN:",
"scsiN:", "sd 0:0:0:0:", etc.) with the "No root device" error below.

In the rdshell, /dev/sda shows up as the internal system hard drive rather
than the USB key. The USB key does not show up as /dev/sdb nor any
other device that I can find. Finally, I looked in /dev/mapper (duh); it
contains /dev/mapper/control, but no /dev/mapper/live-rw.

Sorry for any confusion,
-G.

m.roth wrote:
> Glenn Eychaner wrote:
> > I have been following these instructions:
> > https://www.centos.org/forums/viewtopic.php?t=501
> > to put a bunch of utilities (Clonezilla, SystemRescue, CentOS
> > netinstall/rescue, etc.) on a single USB key.  It works great for
> everything (including
> > Ubuntu Live) except the CentOS 6.4 LiveCD. (You can see my postings at
> the bottom of
> > the forum.) When booting the LiveCD, I got:
> > Kernel panic - not syncing: Attempted to kill init!
> > Pid: 1, comm: init Not tainted 2.6.32-358.el6.i686 #1
> > After removing "quiet" and adding "selinux=disabled", I got more
> 
> Get rid of rhgb, too.
> 
> > information; the boot stalls after finding devices, and gives:
> > No root device "block:/dev/mapper/live-rw" found
> > dracut suggests adding "rdshell", which I did.  This was not helpful (I
> > had no idea what to do in the dracut shell), but did notice that in the
> dracut
> 
> > shell /dev/ did NOT seem to contain my USB drive at /dev/sdb as I would
> expect.
> 
> When you boot from a USB key, it always shows as /dev/sda. Second, rdshell
> is a grub shell.
> 
> Are you trying to boot from the USB? If so, I'd fix the grub menu on that,
> if it's on /dev/sda1 of the flash drive, to use /dev/sda2 for the root=

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Re: [CentOS] vpn client setup/plugin

[Fabio Valente]

@Wes James,

>From now on, you should refer to plugins as packages :)

Sorry for OT


2013/11/19 Wes James 

> On Tue, Nov 19, 2013 at 8:31 AM, John Doe  wrote:
>
> > From: Wes James 
> >
> > > On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB 
> > >> I'm trying to find the correct vpn plugin so I can vpn in to a
> > >> server.
> > >> The server requirements are vpn server, username/password and shared
> > >> secret.
> > > It is a L2TP/IPSec server.
> >
> > Google seems to say to install openswan + xl2tpd (from epel repository).
> >
> > JD
> >
>
> OK Thanks.  I'll try that.
>
> -wes
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Re: [CentOS] CentOS LiveCD on USB

[Glenn Eychaner]

On Nov 19, 2013, at 1:55 PM, Glenn Eychaner  wrote:

> I had already gotten rid of rghb. The grub2 entry on the key for booting the
> LiveCD reads:
> [...]
> linux /CentOS-Live/isolinux/vmlinuz0 root=UUID=A352-6D7C ro liveimg 
> nodiskmount nolvmmount selinux=disabled live_dir=/CentOS_Live/LiveOS

D'Oh!  It was obvious right after I sent the message; underscore instead of 
dash in
live_dir.  Sigh. HOWEVER, even after correcting that, it STILL doesn't boot; 
same
exact message as before.  I have a suspicion that it's not finding the USB key
during the device scan, given that I can't find the USB key in /dev in rdshell.

Possibly a hardware incompatibility? (I haven't been able to test a LiveCD in
the optical drive yet, but will do so now.)

-G.
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Re: [CentOS] CentOS LiveCD on USB

[Glenn Eychaner]

On Nov 19, 2013, at 2:07 PM, Glenn Eychaner  wrote:

> Possibly a hardware incompatibility? (I haven't been able to test a LiveCD in
> the optical drive yet, but will do so now.)

The system boots a liveCD from the DVD drive just fine. It boots CentOS 6.4 from
the hard disk.  It boots everything BUT CentOS 6.4 LiveCD from the USB key.

-G.
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Re: [CentOS] vpn client setup/plugin

[Wes James]

On Tue, Nov 19, 2013 at 10:06 AM, Fabio Valente
wrote:

> @Wes James,
>
> >From now on, you should refer to plugins as packages :)


> Sorry for OT
>
>
> 2013/11/19 Wes James 
>
> > On Tue, Nov 19, 2013 at 8:31 AM, John Doe  wrote:
> >
> > > From: Wes James 
> > >
> > > > On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB  >
> > > >> I'm trying to find the correct vpn plugin so I can vpn in to a
> > > >> server.
> > > >> The server requirements are vpn server, username/password and shared
> > > >> secret.
> > > > It is a L2TP/IPSec server.
> > >
> > > Google seems to say to install openswan + xl2tpd (from epel
> repository).
> > >
> > > JD
> > >
> >
> > OK Thanks.  I'll try that.
> >
> > -wes
>
>  Obrigado, mais

In the Add/Remove programs in the the names of the packages they have
"plugin" in several of the VPN options.

Chauzinho

-wes
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Re: [CentOS] vpn client setup/plugin

[Wes James]

On Tue, Nov 19, 2013 at 8:31 AM, John Doe  wrote:

> From: Wes James 
>
> > On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB 
> >> I'm trying to find the correct vpn plugin so I can vpn in to a
> >> server.
> >> The server requirements are vpn server, username/password and shared
> >> secret.
> > It is a L2TP/IPSec server.
>
> Google seems to say to install openswan + xl2tpd (from epel repository).
>
> JD
>

I found this:

https://wiki.archlinux.org/index.php/L2TP/IPsec_VPN_client_setup

and it seems quite the effort to set up a vpn client.  I started the
process, but when I get to:

ipsec auto --add L2TP-PSK

I get an unexpected CONN error.

I'll keep looking.

Thanks,

-wes
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Re: [CentOS] vpn client setup/plugin

[Fabio Valente]

In which distro are you trying to configure?

Anything on ipsec logs ?

In case you're working on CentOS or any RHEL based, try setting SELinux to
permissive ( setenforce 0 )


2013/11/19 Wes James 

> On Tue, Nov 19, 2013 at 8:31 AM, John Doe  wrote:
>
> > From: Wes James 
> >
> > > On Mon, Nov 18, 2013 at 11:47 PM, Mihamina RKTMB 
> > >> I'm trying to find the correct vpn plugin so I can vpn in to a
> > >> server.
> > >> The server requirements are vpn server, username/password and shared
> > >> secret.
> > > It is a L2TP/IPSec server.
> >
> > Google seems to say to install openswan + xl2tpd (from epel repository).
> >
> > JD
> >
>
> I found this:
>
> https://wiki.archlinux.org/index.php/L2TP/IPsec_VPN_client_setup
>
> and it seems quite the effort to set up a vpn client.  I started the
> process, but when I get to:
>
> ipsec auto --add L2TP-PSK
>
> I get an unexpected CONN error.
>
> I'll keep looking.
>
> Thanks,
>
> -wes
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Re: [CentOS] CentOS LiveCD on USB

[m . roth]

Glenn Eychaner wrote:
> I had already gotten rid of rghb. The grub2 entry on the key for booting
> the LiveCD reads:
>
> menuentry "CentOS 6.4 Live" {
> set root=(hd0,1)
> linux /CentOS-Live/isolinux/vmlinuz0 root=UUID=A352-6D7C ro liveimg
> nodiskmount nolvmmount selinux=disabled live_dir=/CentOS_Live/LiveOS
> initrd /CentOS-Live/isolinux/initrd0.img
> }
>
> The contents of the LiveCD appear in /CentOS_Live as one would expect. The
> boot fails right after a device scan (obvious by tens of lines listing
> "ataN:", "scsiN:", "sd 0:0:0:0:", etc.) with the "No root device" error
below.
>
> In the rdshell, /dev/sda shows up as the internal system hard drive rather
> than the USB key. The USB key does not show up as /dev/sdb nor any
> other device that I can find. Finally, I looked in /dev/mapper (duh); it
> contains /dev/mapper/control, but no /dev/mapper/live-rw.
>
That's odd, that the internal shows up as sda. However, the obvious two
things: first, and esp. if the systems sees the internal as a, is that
this won't work. at all - the grub entry is completely wrong - assuming
that's a grub.conf. If so, you want
title CenOS 6.4 Live
   root (hdx,0)
   kernel /CentOS-Live/isolinux/vmlinuz0 root=  NO_LVM
selinux=disabled  
   initrd /CentOS-Live/isolinux/initrd0.img

Notes:
huh0: are you sure that's the actual UUID of the flash drive? You might
check /dev/disk/by-id
huh1: Not familiar with nodiskmount
huh2: Dunno bout the live_dir... does a quick google...OH! Of course it
won't work - you're using
grub2, which CentOS doesn't support yet (and I hope NEVER, EVER
WILL).

mark

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Re: [CentOS] vpn client setup/plugin

[Wes James]

On Tue, Nov 19, 2013 at 10:33 AM, Fabio Valente
wrote:

> In which distro are you trying to configure?
>


I'm using CentOS 6.4 x64.

I wonder if the instructions for setting it up have different options based
on its age.  The one the installs on CentOS may not have the options he is
talking about.

-wes
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