title: Set vm.max_map_count on cluster nodes
body: <p>I try to install ElasticSearch (latest) on a cluster nodes on Google Container Engine but ElasticSearch needs the variable : <code>vm.max_map_count</code> to be >= 262144.</p>
  
  <p>If I ssh to every nodes and I manually run :</p>
  
  <pre><code>sysctl -w vm.max_map_count=262144
  </code></pre>
  
  <p>All goes fine then, but any new node will not have the specified configuration.</p>
  
  <p>So my questions is :</p>
  
  <p>Is there a way to load a system configuration on every nodes at boot time ?
  Deamon Set would not be the good solution because inside a docker container, the system variables are read-only.</p>
  
  <p>I'm using a fresh created cluster with the <code>gci</code> node image.</p>