anchor.diff:  ulimits is by running:
   
     docker run --rm centos:7 /bin/bash -c 'ulimit -Hn && ulimit -Sn && ulimit -Hu && ulimit -Su'
  +
   --
   
   . Swapping needs to be disabled for performance and node stability. This can be
  
positive.code: uid:gid `1000:1000`.
  +
  --
  CAUTION: One exception is https://docs.openshift.com/container-platform/3.6/creating_images/guidelines.html#openshift-specific-guidelines[Openshift],
  which runs containers using an arbitrarily assigned user ID. Openshift will
  present persistent volumes with the gid set to `0` which will work without any
  adjustments.
  
negative.code: =========================
  
  The `vm.max_map_count` kernel setting needs to be set to at least `262144` for
  production use.
  Depending on your platform:
  
  * Linux
  +
  --
  The `vm.max_map_count` setting should be set permanently in /etc/sysctl.conf:
  
  [source,sh]
  --------------------------------------------
  $ grep vm.max_map_count /etc/sysctl.conf
  