title: GitLab and Redis on Ubuntu 14.04: resource temporarily unavailable
body: <p>My GitLab worked fine, until today. Now I get <code>500</code> error on the front page of GitLab. So I look at the log (<code>/var/log/gitlab/gitlab-rails/production.log</code>) and see this line:</p>
  
  <pre><code>Errno::EAGAIN (Resource temporarily unavailable - connect(2) for /var/opt/gitlab/redis/redis.socket):
  </code></pre>
  
  <p>Of course I've tried commands like these:</p>
  
  <pre><code>$ sudo gitlab-ctl reconfigure
  $ sudo gitlab-ctl kill redis
  $ sudo gitlab-ctl start
  $ sudo gitlab-ctl restart
  </code></pre>
  
  <p>and so on, but it doesn't help.</p>
  
  <p>What can I do? I'd be very grateful for any help.</p>