Live system upgrade tips

[Charles Curley]

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On Thu, May 01, 2003 at 09:10:18PM -0600, Sasha Pachev wrote:
> Hello, everyone:
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> Recently I have had an opportunity to upgrade a number of live services. =
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> some cases the upgrade was not trivial, not successful at the first attem=
pt,=20
> and required a temporary downgrade to keep the service running while I wa=
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> trying to figure out what exactly had gone wrong. Here are some tips I ha=
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> gathered from the experience, mostly common sense, but easy to forget or=
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> neglect especially under pressure:

All good points. May I add two more:

* Practice with a throw-away testbed machine first. That way, if you
  have problems, the public server is unaffected.

* Upgrade one service at a time, and give it a reasonable period in
  between (say several days) to be sure it is working correctly. This
  will help to isolate problems.

--=20

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