Ubuntu 8.10 and 9.04 (Intrepid Ibex and Jaunty Jackalope) upgrade notes

I’m at WordCamp San Francisco today and decided that running a year old version of WordPress (on a year old version of Ubuntu Linux) was undesirable. So, with the confidence that comes from many relatively easy Ubuntu OS upgrades, I charged ahead. For (I think) the second time ever, things went badly. Here’s what I did and how I fixed it.
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CentOS 5.3 Minimal VPS Install Guide

I just did this yesterday; you can pretty much just follow my CentOS 5.1 Minimal VPS Install Guide.

The differences are:

  • When you get to the “More Minimizing” section, yum -C grouplist will show a package called “Yum Utilities” which you probably want to leave installed.
  • The Deployment_Guide-en-US file is not there so you don’t need to remove it.

That’s it.

I should also note that downloading a 3.9GB DVD ISO image in order to build a ~700MB installed OS may not be very efficient. I didn’t bother looking for a network installer but that might be the way to get this done faster.

Ubuntu Linux 8.04 “Hardy Heron” Upgrade Report

Painless! I’m actually starting to expect it to work without hitches now.

There are a couple of config file changes that need babysitting but none of them was difficult; I really do wish it would automatically do a three way merge between its old package version, the new version, and my version, and just assume “yes” if they merge cleanly.

Instructions are trivial: see Hardy Upgrades: Network Upgrade for Ubuntu Servers (Recommended).

This also works fine on Xen.

Silencing pointless reverse DNS warnings from OpenSSH

If you’ve been using SSH for long you’ve probably seen this at least once: Address 11.22.33.44 maps to www.foobar.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

Sometimes this is helpful. Sometimes this is really annoying and incorrect. Assuming you are a moderately well informed sysadmin and know that this message can safely be ignored, you might have been stumped trying to silence it. You may have tried every option in man ssh_options and even some of your own ( STFU on?) I think I may be able to help.
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Recommended mount options for ext3

The details of the various mount options for the ext3 filesystem are fairly well documented, but as with many things in the Unix world, knowledge is far easier to come by than wisdom. That’s a pithy way of saying that I had to do some digging to find recommendations, as opposed to explanations. So here are my recommendations for ext3 users (which encompasses the majority of the Linux-using world, as far as I can tell).
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