title: Redis fails to start with error: redis-server.service: Failed at step NAMESPACE spawning /usr/bin/redis-server: Stale file handle
body: <p>After upgrading Debian, it has an issue starting <code>redis-server.service</code>. 
  In the output of <code>journalctl -xe</code> I see the following:</p>
  
  <pre><code>redis-server.service: Failed at step NAMESPACE spawning /usr/bin/redis-server: Stale file handle.
  </code></pre>
  
  <p>I can't start the redis-server.service and in the output of the <code>systemctl start redis-server</code> I have:</p>
  
  <pre><code>Job for redis-server.service failed because the control process exited with error code.
  See "systemctl status redis-server.service" and "journalctl -xe" for details.
  </code></pre>
  
  <p>In the output of <code>systemctl status redis-server</code> I have:</p>
  
  <pre><code>● redis-server.service - Advanced key-value store
     Loaded: loaded (/lib/systemd/system/redis-server.service; disabled; vendor preset: disabled)
     Active: failed (Result: exit-code) since Mon 2018-01-29 10:29:08 MSK; 58s ago
       Docs: http://redis.io/documentation,
             man:redis-server(1)
    Process: 11701 ExecStop=/bin/kill -s TERM $MAINPID (code=exited, status=226/NAMESPACE)
    Process: 11720 ExecStart=/usr/bin/redis-server /etc/redis/redis.conf (code=exited, status=226/NAMESPACE)
   Main PID: 10193 (code=exited, status=0/SUCCESS)
  
  Jan 29 10:29:08 xxx systemd[1]: redis-server.service: Service hold-off time over, scheduling restart.
  Jan 29 10:29:08 xxx systemd[1]: redis-server.service: Scheduled restart job, restart counter is at 5.
  Jan 29 10:29:08 xxx systemd[1]: Stopped Advanced key-value store.
  </code></pre>
  
  <p>My question how to fix this issue and start redis-server.service?</p>