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From Yehuda Katz <yeh...@ymkatz.net>
Subject Re: [users@httpd] Re: apachectl -k graceful
Date Thu, 03 May 2018 14:49:51 GMT
We have a server farm with a load balancer, but we still announce a
maintenance window when we do major MediaWiki upgrades and take the site
down for five minutes.
The other thing we do is use PHP-FPM instead of mod_php. That lets us not
worry about HTTPD restarts.

- Y

On Thu, May 3, 2018 at 9:32 AM Greg Rundlett (freephile) <greg@freephile.com>
wrote:

> I've read the manual
> https://httpd.apache.org/docs/2.4/stopping.html#graceful and believe I'm
> doing things "the right way". I know I've seen anecdotes and forum
> discussions where people complain of long restarts, but I'm confident that
> those are the result of some particular environment issue (like
> long-running child processes) or misconfiguration. I've also heard
> anecdotes that sometimes during a deployment of new MediaWiki versions
> (thousands of php files) that you might see weird bugs because a specific
> user request could get a "mixed" set of files (aka some from Vx and some
> from Vy). I assume the best way to handle roll-outs is to take a server out
> of rotation from the loadbalancer; update it; and then add it back in. But
> what about deployments where there is only one server? Short of stopping
> the server, I guess the technique there would be to make all file updates
> to a shadow directory, and then replace the symlink or mv the shadow
> directory into the real directory.
>
> I can look at the scoreboard in server-status during my next deploy to
> check how things go. Or even better, I could install
> https://github.com/humbedooh/server-status to keep an eye on things.
>
> Still, if anyone on list can confirm their practice for rolling out
> changes to php.ini + clearing opcache + pushing new code to production
> under Apache and mod_php, that would be appreciated.
>
> Greg Rundlett
> https://eQuality-Tech.com
> https://freephile.org
>
> On Wed, May 2, 2018 at 3:12 PM, Greg Rundlett (freephile) <
> greg@freephile.com> wrote:
>
>> If I do an apache2ctl -k graceful on Ubuntu (or service httpd restart in
>> CentOS), using mod_php and a max_execution_time = 30 in php.ini, then is
>> there any reason why the server would take more than say 1 minute to serve
>> all requests with the new php.ini + Apache configuration (+ php files)?
>>
>> I know max_execution_time doesn't include system calls, so if a large
>> file were being uploaded and simultaneously thumbnailed at various sizes
>> with imagemagick or something, then it could take more than 30 seconds.
>>
>> I'm asking because I'm doing DevOps and I don't want to introduce delay
>> into deployments (which already take 15 minutes), but I feel that if I'm
>> deploying new PHP files (MediaWiki), then each client request should get a
>> consistent set of files, rather than mixed content from two different
>> releases which could happen if I just deploy updates without making a
>> simultaneous graceful restart.
>>
>> Thanks,
>>
>> Greg
>>
>> Greg Rundlett
>> https://eQuality-Tech.com
>> https://freephile.org
>>
>
>

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