add examples

README.md

@@ -97,6 +97,22 @@ Install the new installer from https://www.github.com/openshift/installer
 Construct a proper install-config.yml, and make a copy called
 install-config-ansible.yml.
 
+## Hosts
+You will need the following hosts
+
+### Boostrap host
+This is a special host that is not part of the cluster but is required to be
+available to help the cluster bootstrap itself.  This is not a bastion host,
+it will initially be part of the cluster and should be able to communicate with
+the masters in the cluster.
+
+### Masters
+You need 1 or 3 masters.
+
+### Workers
+You need 0 or more workers.  Note, by default, masters are unschedulable so
+you will need one or more workers if you want to schedule workloads.
+
 ## DNS
 4.x installs require specific dns records to be in place, and there is no way
 to complete an install without working DNS.  You are in charge of ensuring the
@@ -113,6 +129,7 @@ install-config.yml value of 'baseDomain' must be a working domain.
 <clustername>-api.<baseDomain> # ex: mycluster-api.example.com
 <clustername>-master-0.<baseDomain> # ex: mycluster-master-0.example.com
 <clustername>-etcd-0.<baseDomain> # ex: mycluster-etcd-0.example.com
+<clustername>-bootstrap.<baseDomain> # ex: mycluster-bootstrap.example.com
 ```
 
 Note: There should be a master/etcd record for each master host in your cluster

inventory/40_basic_inventory.ini

@@ -0,0 +1,24 @@
+[nodes:children]
+bootstrap
+masters
+workers
+
+[nodes:vars]
+ansible_ssh_user=centos
+ansible_become=True
+
+openshift_install_config_path="~/install-config-ansible.yml"
+openshift_deployment_type=origin
+openshift_release=v4.0
+
+[bootstrap]
+mycluster-bootstrap.example.com
+
+[bootstrap:vars]
+openshift_ignition_file_path="~/bootstrap.ign"
+
+[masters]
+mycluster-master-0.example.com
+
+[workers]
+mycluster-worker-0.example.com

inventory/install-config-example.yml

@@ -0,0 +1,30 @@
+---
+baseDomain: example.com
+machines:
+- name: master
+  replicas: 1
+- name: worker
+  # This should always be zero for openshift-ansible
+  replicas: 0
+metadata:
+  name: mycluster
+networking:
+  clusterNetworks:
+  - cidr: 10.128.0.0/14
+    hostSubnetLength: 9
+  serviceCIDR: 172.30.0.0/16
+  type: OpenshiftSDN
+platform:
+  libvirt:
+    # This URI is not actually used
+    URI: null
+    defaultMachinePlatform:
+      image: file:///unused
+    masterIPs: null
+    network:
+      if: null
+      ipRange: null
+pullSecret: |
+  < paste your pullSecret here >
+sshKey: |
+  < paster your pubkey here >