title: nginx crashing daily and error.log shows nothing
body: <p>I have an nginx server setup as a reverse proxy that seems to be crashing daily. There was never any issue with the server before but recently (a month or so ago) I started noticing that nginx wasn't running and I'd have to log into the server to start the process up again. </p>
  
  <p>I'm having trouble finding anything useful in the logs. I'd appreciate any help in diagnosing the issue.</p>
  
  <p>nginx version: nginx/1.10.3 (Ubuntu)</p>
  
  <p>os: Ubuntu 16.04.4 LTS (running in an LXC)</p>
  
  <pre><code># systemctl status nginx
  ● nginx.service - A high performance web server and a reverse proxy server
  Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
  Active: inactive (dead) since Sat 2018-06-23 21:49:46 UTC; 1min 23s ago
  Process: 13485 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=1/FAILURE)
  Process: 13402 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Process: 13401 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Main PID: 13403 (code=exited, status=0/SUCCESS)
  
  Jun 23 10:30:17 nginx systemd[1]: Starting A high performance web server and a reverse proxy server...
  Jun 23 10:30:17 nginx systemd[1]: Started A high performance web server and a reverse proxy server.
  </code></pre>
  
  <p>cat /var/log/nginx/error.log</p>
  
  <pre><code>2018/06/23 21:49:46 [notice] 13484#13484: signal process started
  </code></pre>
  
  <p>There was nothing suspicious in the <code>access.log</code> file.</p>
  
  <p>Let me know if there's any more information that would be helpful</p>