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    <p>I experienced a similar problem, but my logs clearly identified the issue: sending USR2 would initially work on deployments, but as deployments got cleaned up, the release that the Unicorn master was initially started on would get deleted, so attempts at sending a USR2 signal would appear to do nothing / fail, with the error log stating:</p> <blockquote> <p>forked child re-executing... 53 /var/www/application/releases/153565b36021c0b8c9cbab1cc373a9c5199073db/vendor/bundle/ruby/1.9.1/gems/unicorn-4.3.1/lib/unicorn/http_server.rb:439:in `exec': No such file or directory - /var/www/application/releases/153565b36021c0b8c9cbab1cc373a9c5199073db/vendor/bundle/ruby/1.9.1/bin/unicorn (Errno::ENOENT)</p> </blockquote> <p>The Unicorn documents mention this potential problem at <a href="http://unicorn.bogomips.org/Sandbox.html" rel="noreferrer">http://unicorn.bogomips.org/Sandbox.html</a>: "cleaning up old revisions will cause revision-specific installations of unicorn to go missing and upgrades to fail", which in my case meant USR2 appeared to 'do nothing'.</p> <p>I'm using Chef's application recipe to deploy applications, which creates a symlinked vendor_bundle directory that is shared across deployments, but calling <code>bundle exec unicorn</code> still resulted in the original Unicorn master holding a path reference that included a specific release directory.</p> <p>To fix it I had to call <code>bundle exec /var/www/application/shared/vendor_bundle/ruby/1.9.1/bin/unicorn</code> to ensure the Unicorn master had a path to a binary that would be valid from one deployment to the next. Once that was done I could deploy to me heart's content, and <code>kill -USR2 PID</code> would work as advertised.</p> <p>The Unicorn docs mention you can manually change the binary path reference by setting the following in the Unicorn config file and sending HUP to reload Unicorn before sending a USR2 to fork a new master: <code>Unicorn::HttpServer::START_CTX[0] = "/some/path/to/bin/unicorn"</code></p> <p>Perhaps this is useful to some people in similar situations, but I didn't implement this as it appears specifying an absolute path to the shared unicorn binary was enough.</p>
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