title: How to monitor docker containers log from non-root user?
body: <p>I want to monitor docker containers log from non-root user(td-agent) and on host server,</p>
  
  <pre><code>sudo chmod o+rx /var/lib/docker
  sudo find /var/lib/docker/containers/ -type d -exec chmod o+rx {} \;
  sudo find /var/lib/docker/containers/ -type f -exec chmod o+r {} \;
  </code></pre>
  
  <p>But containers directory rollback 600 and each container directory keep 600.</p>
  
  <pre><code># find /var/lib/docker/containers -ls
  143142    4 drwx------   4 root     root         4096 Aug 14 12:01 /var/lib/docker/containers
  146027    4 drwx------   2 root     root         4096 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d
  146031    4 -rw-r--r--   1 root     root          190 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d/hostconfig.json
  146046    4 -rw-r--r--   1 root     root           13 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d/hostname
  146047    4 -rw-r--r--   1 root     root          174 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d/hosts
  146030    4 -rw-r--r--   1 root     root         3305 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d/config.json
  146049    4 -rw-------   1 root     root         1853 Aug 14 12:00 /var/lib/docker/containers/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d/145efa73652aad14e1706e8fcd1597ccbbb49fd756047f3931270b46fe01945d-json.log
  146050    4 drwx------   2 root     root         4096 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370
  146054    4 -rw-r--r--   1 root     root          190 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370/hostconfig.json
  146056    4 -rw-r--r--   1 root     root           13 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370/hostname
  146057    4 -rw-r--r--   1 root     root          174 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370/hosts
  146053    4 -rw-r--r--   1 root     root         3286 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370/config.json
  146058    4 -rw-------   1 root     root         1843 Aug 14 12:01 /var/lib/docker/containers/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370/f09796f978ef5bab1449d2d10d400228eb76376579e7e33c615313eeed53f370-json.log
  </code></pre>
  
  <p>How to monitor this each <code>json.log</code>? or any other good monitoring way?</p>