fabian dacunha wrote:

i jus wanted to know if i could SAFELY apply the updates since its a live
server running our companys primary DNS and mail server



noone has your exact configuration, so the only way to know if it will
for sure work for you would be to test it on a staging server configured
identically to your production server, or at least, make full backups of
your system so you can restore it if something goes wrong.


generally, updates are safe if your system is clean and doesn't have its
system components polluted by non-distribution code.

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Why don't you clone your machine, or use Vmware or something, and do an test
before you do it with your production-machine? Asking this sort of question is,
well, rather meaningless IMO. Your setup is unique considering what tweaks you
might've done to it. YMMV as they say. What works for me, doesn't necessarily
work for you, or vice versa.

Testing before use in sharp situations is always a good idea, although I've been
pampered and spoiled by CentOS's stability on inplace-upgrades, like this last
one. 8-}


-----Original Message-----
From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of
fabian dacunha
Sent: Thursday, June 26, 2008 8:46 PM
To: centos@centos.org
Subject: [CentOS] is centos update safe


Dear All,

I am curently running a CENTOS server with the following setup

CentOS release 5 (Final)
Kernel 2.6.18-8.1.8.el5xen on an i686
bind-9.3.3-10.el5
sendmail-8.13.8-2.el5
apache httpd-2.2.3-11.el5_1.centos.3
MailScanner ver 4.66.5
ClamAV 0.92
SpamAssassin version 3.2.4
SquirrelMail ver 1.4.13

Now all this have been workin perfectly fine for a long time.

now if i do a yum upgrade i see the following

Install 29 Package(s)
Update 415 Package(s)
Remove 0 Package(s)

and the total download size is abt 579 M

i jus wanted to know if i could SAFELY apply the updates since its a live
server running our companys primary DNS and mail server

has any body done this b4

i know the Centos will be upgraded to 5.2

but has anybody applied these updates and its been workin fine after reboot
and also about the various software currently running on the server
apprecite your help and asvise

regards

Fabian







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On Thu, 2008-06-26 at 11:35 -0700, John R Pierce wrote:
> fabian dacunha wrote:
> > i jus wanted to know if i could SAFELY apply the updates since its a live
> > server running our companys primary DNS and mail server

In case you missed it, there was a recommended "two step" and parameter
recommendation.

1. yum update yum rpm
2. yum upgrade # not update

> >
>
> <snip>

As Jim alluded to, and others have stated explicitly in the past, an
update of a live server without adequate testing and/or fallback plan is
akin to unassisted suicide. It won't be your foot you shot yourself in
if something goes drastically wrong.

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On Thu, 2008-06-26 at 21:46 +0300, fabian dacunha wrote:
> Dear All,
>
> I am curently running a CENTOS server with the following setup
>
> CentOS release 5 (Final)
> Kernel 2.6.18-8.1.8.el5xen on an i686

Stating the obvious, you are WAY behind on updates, including many
security patches.

> bind-9.3.3-10.el5
> sendmail-8.13.8-2.el5
> apache httpd-2.2.3-11.el5_1.centos.3
> MailScanner ver 4.66.5
> ClamAV 0.92
> SpamAssassin version 3.2.4
> SquirrelMail ver 1.4.13
>
> Now all this have been workin perfectly fine for a long time.
>
> now if i do a yum upgrade i see the following
>
> Install 29 Package(s)
> Update 415 Package(s)
> Remove 0 Package(s)
>
> and the total download size is abt 579 M
>
> i jus wanted to know if i could SAFELY apply the updates since its a live
> server running our companys primary DNS and mail server

I'd have a bootable backup ready before trying this. See the section on
"cloning" in http://wiki.centos.org/HowTos/MigrationGuide.

> has any body done this b4

Lots of people have updated by now.

> i know the Centos will be upgraded to 5.2
>
> but has anybody applied these updates and its been workin fine after reboot
> and also about the various software currently running on the server
> apprecite your help and asvise

Have had two mysterious crashes of my main server since upgrading
yesterday, one on kernel-2.6.18-92.1.1.el5.x86_64 and the second on
kernel-2.6.18-92.1.6.el5.x86_64. Just quietly dies with nothing in the
logs. Several other upgraded systems (all i386) seem to be fine. Still
searching for any other reports of problems.

Phil



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William L. Maltby wrote on Thu, 26 Jun 2008 14:48:48 -0400:

> 2. yum upgrade # not update

that's supposed to be the same.

Kai

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On Thu, 2008-06-26 at 21:31 +0200, Kai Schaetzl wrote:
> William L. Maltby wrote on Thu, 26 Jun 2008 14:48:48 -0400:
>
> > 2. yum upgrade # not update
>
> that's supposed to be the same.

IIRC, that's true if default config file wasn't modified with certain
parameters. Do I mis-remember? IIRC, upgrade works correctly even if
they changed that config parameter. So, better safe than sorry.

If I mis-remember, please forgive an old fart with half-heimer's. :-))

>
> Kai
>

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I just updated from an i386 CentOS 5 system today, using the reccommendeds steps on my server, and it went fine.

So it *should* also go fine for you, but, as has been said before, Your Mileage May Vary.


2008/6/26 William L. Maltby <CentOS4Bill@triad.rr.com>:



On Thu, 2008-06-26 at 21:31 +0200, Kai Schaetzl wrote:

> William L. Maltby wrote on Thu, 26 Jun 2008 14:48:48 -0400:

>

> > 2. yum upgrade # not update

>

> that's supposed to be the same.



IIRC, that's true if default config file wasn't modified with certain

parameters. Do I mis-remember? IIRC, upgrade works correctly even if

they changed that config parameter. So, better safe than sorry.



If I mis-remember, please forgive an old fart with half-heimer's. :-))



>

> Kai

>



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on 6-26-2008 3:09 PM Michael Holmes spake the following:
I just updated from an i386 CentOS 5 system today, using the
reccommendeds steps on my server, and it went fine.


So it *should* also go fine for you, but, as has been said before, Your
Mileage May Vary.


Even though there have been several posts with problems, there have probably
been hundreds of upgrades if not thousands that went fine.


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William L. Maltby <> scribbled on Thursday, June 26, 2008 8:49 PM:

> an
> update of a live server without adequate testing and/or fallback plan is
> akin to unassisted suicide. It won't be your foot you shot yourself in
> if something goes drastically wrong.

LOL! Clear and to the point. Good one!
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Thanks guys for the various suggestions

really do apprecite
but as u guys say i shd follow ..

have a perfect backup system and then do the upgrade

really apprecite

regards

fabian

simon






> I just updated from an i386 CentOS 5 system today, using the reccommendeds
> steps on my server, and it went fine.
>
> So it *should* also go fine for you, but, as has been said before, Your
> Mileage May Vary.
>
> 2008/6/26 William L. Maltby <CentOS4Bill@triad.rr.com>:
>
>>
>> On Thu, 2008-06-26 at 21:31 +0200, Kai Schaetzl wrote:
>> > William L. Maltby wrote on Thu, 26 Jun 2008 14:48:48 -0400:
>> >
>> > > 2. yum upgrade # not update
>> >
>> > that's supposed to be the same.
>>
>> IIRC, that's true if default config file wasn't modified with certain
>> parameters. Do I mis-remember? IIRC, upgrade works correctly even if
>> they changed that config parameter. So, better safe than sorry.
>>
>> If I mis-remember, please forgive an old fart with half-heimer's. :-))
>>
>> >
>> > Kai
>> >
>>
>> --
>> Bill
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS@centos.org
>> http://lists.centos.org/mailman/listinfo/centos
>>
>
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>



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