title: Docker overlay2 eating Disk Space
body: <p>Below is the file system in overlay2 eating disk space, on Ubuntu Linux 18.04 LTS</p>
  
  <p>Disk space of server 125GB</p>
  
  <pre><code>overlay         124G  6.0G  113G   6% /var/lib/docker/overlay2/9ac0eb938cd2a50bb87e8ed13605d3f09214fdd9c8967f18dfc3f9432701fea7/merged
  overlay         124G  6.0G  113G   6% /var/lib/docker/overlay2/397b099799212060ee7a4718660aa13aba8aa1fbb92f4d88d86fbad94e572847/merged
  shm              64M     0   64M   0% /var/lib/docker/containers/7ffb129016d187a61a31c33f9e468b98d0ac7ab1771b87631f6caade5b84adc6/mounts/shm
  overlay         124G  6.0G  113G   6% /var/lib/docker/overlay2/df7c4acee73f7aa2536d2a8929a48241bc8e92a5f7b9cb63ab70cea731b52cec/merged
  </code></pre>