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I am working on a multi-server system for a client. All of the servers are fresh installs (although two were installed a couple of months ago, five a couple of days ago).

They are all supposed to be the same version of everything, but when I uname -a the two that were installed originally have

3.2.0-36-generic #57-Ubuntu SMP GNU/Linux

and the five new ones have

3.2.0-29-generic #46-Ubuntu SMP GNU/Linux

I have done apt-get upgrade on all servers, but this doesn't change. Is it a big deal? The servers will be a replicated mysql setup and the mysql version is the same on all of them.

Is it easy (or worthwhile) to upgrade the #46 to #57 so they are the same through and through? They are the same hardware. Can you point me to some guides as to how to do this upgrade?

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you should really investigate deploying a configuration management system like Puppet if you're working on a multi-server environment. It will help eliminate headaches like this... – voretaq7 Jan 25 '13 at 5:44

Different uname -a results

Are those servers have very different uptime?
My guess is that your running and installed kernels are out of sync. After installation of new kernel you should generally reboot the system for changes to take effect.

They are all supposed to be the same version of everything

Don't assume - check!
To debug your problem further you should probably look into /boot/ directory for list of available kernels and check loader configuration. Also check dpkg -l|grep linux-image output.

Is it easy (or worthwhile) to upgrade the #46 to #57 so they are the same through and through?

To answer this question you should probably checkout changelog for you kernel package. This can be done for example via apt-get changelog <package_name>. But general recommendation is to always use latest kernel version provided by distrib's security team unless it introduces visible regressions for your workload.

PS. To upgrade system packages under Ubuntu one should use apt-get dist-upgrade
PPS. Also as suggested in comments if you have more than one server it's usually a nice idea to use Chef/Puppet/Cfengine.

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Did you do an apt-get update before you did your apt-get upgrade? If so, you probably have different apt sources enabled on the newer machines.

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I did, yes but I did both update and upgrade on all machines – Ben Holness Jan 25 '13 at 11:02

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