RAILS_ROOT and USR2 restarts

Ian Leitch port001 at gmail.com
Mon Oct 26 12:13:31 EDT 2009


Apologies for the noise, I discovered START_CTX[:cwd] and that fixed it.

Solaris sh is indeed the culprit:

$ cd /var/www/apps/production/current
(admin at production:/var/www/apps/production/current)
$ sh -c pwd
/var/www/apps/production/releases/20091026160154

Thanks for creating Unicorn!


2009/10/26 Eric Wong <normalperson at yhbt.net>:
> Ian Leitch <port001 at gmail.com> wrote:
>> Hi,
>>
>> I've just started using Unicorn in production behind Nginx with a
>> Rails app, for the most part its been a smooth transition apart from
>> this one issue.
>> When I do an in place restart (USR2), the restart process works but
>> the workers load my old Rails release, not the new one. I'm guessing
>> that because the master process is currently in the old release
>> directory, when I signal USR2 it's just reloading inside the current
>> directory. I'm deploying with Capistrano, so app/current is a symlink
>> to a specific release. I've tried changing to the new release
>> directory in before_work but that made no difference. Is there a
>> callback that fires before the master preloads the app?
>
> Hi Ian,
>
> Unicorn chdirs to the directory returned by `/bin/sh -c pwd` when it was
> originally started.  The output of `pwd` *should* be symlink-aware, but
> then Solaris /bin/sh is weird.  Can you confirm that it's broken?
>
> You can put the following in your config (outside of the hooks):
>
>  app_root = "/var/www/apps/systino_production/current"
>  Dir.chdir(Unicorn::HttpServer::START_CTX[:cwd] = app_root)
>
> I've been pondering adding a "working_directory" directive to
> Configurator, too.  However the START_CTX hash is considered a stable
> interface and I recently documented it in
> http://unicorn.bogomips.org/Unicorn.html
>
> START_CTX even allows you to switch between different installation paths
> for Unicorn[1] and alter command line options that were originally
> passed.  Lots of rope there :>
>
> [1] for different Ruby installs/versions,
>    or even swap in Rainbows! or vice versa
>
> --
> Eric Wong
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