Date: Thu, 29 May 2008 18:31:07 +0200 From: Gunther Mayer <gunther.mayer@googlemail.com> To: Bill Moran <wmoran@potentialtech.com> Cc: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Best way of upgrading postgresql in production? Message-ID: <483EDA4B.1020408@googlemail.com> In-Reply-To: <20080529091524.d485ae21.wmoran@potentialtech.com> References: <483EA5AF.5040901@gmail.com> <20080529091524.d485ae21.wmoran@potentialtech.com>
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Bill Moran wrote:
> In response to Gunther Mayer <gunther.mayer@googlemail.com>:
>
>> I've been grappling with this and read all sorts of email threads and
>> blog posts but I still have no good solution to the following problem: I
>> want to upgrade a postgresql installation on FreeBSD 6.3 from 8.2 to 8.3
>> as we'd like to take advantage of its new features and performance
>> enhancements. Yet none of the ports system offers no clean _and_ quick
>> way of performing such an upgrade as the Makefiles of the respective
>> ports choke as soon as they detect an existing older -server or -client.
>>
>> Yet all I want to do is in a script which fires automatically at 5am via
>> cron (of course I'll get up to check just in case but I've done this
>> many times before):
>>
>> 1. Do all backup tasks (build packages for all installed postgresql
>> 8.2 stuff for possible rollback, full database dump, configs etc.)
>> and take down all processes that write to the db
>> 2. Shut down the database
>> 3. Uninstall all postgresql 8.2 ports (client, server and client libs
>> we depend on)
>> 4. Install all postgresql 8.3 ports
>> 5. Fire up the new db, restore the complete database dump
>> 6. Restore the configs (pg_hba.conf, postgresql.conf etc.) and
>> restart the database
>> 7. Start up all "db write" services again
>>
>> Ideally that process shouldn't take longer than 5 minutes but step
>> number 4 is currently a big stumbling block as
>>
>> * Building from ports will take a while
>> * I can't find any binary packages for 8.3 (would need i386 for
>> testing and amd64 for live) anywhere as far as I can see
>> (ftp.freebsd.org has nothing, nor do the mirrors)
>> * building binary packages myself is impossible on the same machines
>> as pkg_create can only do that with installed packages, "make
>> package" et. all choke when they realise you already have
>> 82-{client,server} installed and I don't see any other way of
>> creating a package without installing one
>>
>> How can I get out of this catch-22 /without /resorting to complicated
>> jail setups or even worse, manual compilations with different prefixes
>> and other nasties? There must be a way to get a package somehow...
>>
>
> Jail setups are not complicated. You could also make the packages on
> another system. How about doing a make package on the server that you've
> tested your application against 8.3 on? You _have_ done that, right?
>
That's not an option since my testing box runs i386 while the live one
runs amd64, I guess I should really invest in a testing box with the
same arch...
> What makes you think that jail setups are so complicated. I set up new
> jails almost every week. I get the impression that you have some reason
> for avoiding the obvious solution, and I suspect it revolves around some
> incorrect impression that jails are "complicated".
Ok, you're probably right, I just haven't worked with jails before and
have just read the wrong articles. I will investigate how I could
install the newer version in a jail and keep both running at the same
time during the upgrade, I'll probably run into more problems along the
way but will post again if I'm stuck.
Thanks,
Gunther
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