title: what does kubernetes use the container pause-amd64 for?
body: <p>I set up the <code>kubernetes</code> cluster, and I found the <code>pause-amd64:3.0</code> container on master or minion like this:</p>
  
  <pre><code>[root@k8s-minion1 kubernetes]# docker ps |grep pause
  c3026adee957        gcr.io/google_containers/pause-amd64:3.0           "/pause"                 22 minutes ago      Up 22 minutes                           k8s_POD.d8dbe16c_redis-master-343230949-04glm_default_ce3f60a9-095d-11e7-914b-0a77ecd65f3e_66c108d5
  202df18d636e        gcr.io/google_containers/pause-amd64:3.0           "/pause"                 24 hours ago        Up 24 hours                             k8s_POD.d8dbe16c_kube-proxy-js0z0_kube-system_2866cfc2-0891-11e7-914b-0a77ecd65f3e_c8e1a667
  072d3414d33a        gcr.io/google_containers/pause-amd64:3.0           "/pause"                 24 hours ago        Up 24 hours                             k8s_POD.d8dbe16c_kube-flannel-ds-tsps5_default_2866e3fb-0891-11e7-914b-0a77ecd65f3e_be4b719e
  [root@k8s-minion1 kubernetes]#
  </code></pre>
  
  <p>so what does <code>k8s</code> use this for ? </p>