anchor.diff:  node hosts during the Ansible install by configuring the *_/etc/ansible/hosts_*
   file. Labels are useful for determining the placement of pods onto nodes using
   the link:../../admin_guide/scheduler.html#configurable-predicates[scheduler].
  +Other than *region=infra* (discussed below), the actual label names and values
  +are arbitrary and can be assigned however you see fit per your cluster's
  +requirements.
   
   To assign labels to a node host during an Ansible install, use the
   `*openshift_node_labels*` variable with the desired labels added to the desired
  -node host entry in the *[nodes]* section. For example:
  +node host entry in the *[nodes]* section. In the following example, labels are
  +set for a region called *primary* and a zone called *east*:
   
   ====
   ----
   [nodes]
   node1.example.com openshift_node_labels="{'region': 'primary', 'zone': 'east'}"
  +----
  +====
  +
  +The `*openshift_router_selector*` and `*openshift_registry_selector*` Ansible
  +settings are set to *region=infra* by default:
  +
  +====
  +----
  +# default selectors for router and registry services
  +# openshift_router_selector='region=infra'
  +# openshift_registry_selector='region=infra'
  +----
  +====
  +
  +The default router and registry will be automatically deployed if nodes exist
  +that match the selector settings above. For example:
  +
  +====
  +----
  +[nodes]
  +node1.example.com openshift_node_labels="{'region':'infra','zone':'default'}"
   ----
   ====
   
  
positive.code: master.example.com openshift_node_labels="{'region':'infra','zone':'default'}" openshift_schedulable=false
  ----
  ====
  
  [[advanced-install-session-options]]
  
  
negative.code: which may cause invalid configurations. Example usage:
  *{'image-gc-high-threshold': ['90'],'image-gc-low-threshold': ['80']}*.
  
  |`*openshift_router_selector*` 
  |Default node selector for automatically deploying router pods. See
  link:#configuring-node-host-labels[Configuring Node Host Labels] for details.
  
  |`*openshift_registry_selector*`
  |Default node selector for automatically deploying registry pods. See
  link:#configuring-node-host-labels[Configuring Node Host Labels] for details.
  
  |===
  
  [[configuring-cluster-variables]]
  