[mdlug] CentOS for Production (CentOS 6.0 Vs 6.1 Vs 6.2) [TIP]

[Adam Tauno Williams]

On Mon, 2012-02-27 at 11:21 +0530, nk oorda wrote:
> On Mon, Feb 27, 2012 at 9:40 AM, Aaron Kulkis <akulkis00 at gmail.com> wrote:
> > > We are currently using CentOS 5.3 for production systems.
> > > The application/software/package we are using mainly:
> > > - Apache
> > > - Tomcat
> > > - SOLR
> > > - Mysq
> > > We are in process to upgrade the CentOS.
> > > What would be the best CentOS candidate for upgrade (CentOS 6.0 Vs 6.1 Vs
> > > 6.2)
> > > We are using both physical and virtual system.
> > Rule number one, ALWAYS use a test system before upgrading your production
> > systems,
> > otherwise, you really have no idea what will happen.
> Yes, we have QA and staging environment in place. So we are going to update
> the QA first then Staging and then Production.

One gotcha I've noticed specifically with CentOS6 is that with new
installs / instances that ONBOOT=yes does not get added to the network
interface profile.  So you reboot.... to no network connectivity till
you "ifup eth?" at the console - then everything works.  Looking
in /etc/sysconfig/networ.../ifcfg-eth0 you see "ONBOOT=no".

Hasn't happened everytime, but fairly frequently.
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