anchor.diff:  master.example.com openshift_node_labels="{'region':'infra','zone':'default'}" openshift_schedulable=false
   ----
   ====
  +
   
   [[advanced-install-session-options]]
   
  
positive.code: which may cause invalid configurations. Example usage:
  *{'image-gc-high-threshold': ['90'],'image-gc-low-threshold': ['80']}*.
  
  |===
  
  [[configuring-cluster-variables]]
  
negative.code: 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. 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'}"
  ----
  ====
  
  