Add a bare minimum localhost hosts file

CONTRIBUTING.md

@@ -74,6 +74,27 @@ If you are new to Git, these links might help:
 
 ---
 
+## Simple all-in-one localhost installation
+```
+git clone https://github.com/openshift/openshift-ansible
+cd openshift-ansible
+sudo ansible-playbook -i inventory/hosts.localhost playbooks/prerequisites.yml
+sudo ansible-playbook -i inventory/hosts.localhost playbooks/deploy_cluster.yml
+```
+
+## Development process
+Most changes can be applied by re-running the config playbook. However, while
+the config playbook will run faster the second time through it's still going to
+take a very long time. As such, you may wish to run a smaller subsection of the
+installation playbooks. You can for instance run the node, master, or hosted
+playbooks in playbooks/openshift-node/config.yml,
+playbooks/openshift-master/config.yml, playbooks/openshift-hosted/config.yml
+respectively.
+
+We're actively working to refactor the playbooks into smaller discrete
+components and we'll be documenting that structure shortly, for now those are
+the most sensible logical units of work.
+
 ## Running tests and other verification tasks
 
 We use [`tox`](http://readthedocs.org/docs/tox/) to manage virtualenvs where

README.md

@@ -67,7 +67,17 @@ Fedora:
 dnf install -y ansible pyOpenSSL python-cryptography python-lxml
 ```
 
-## OpenShift Installation Documentation:
+## Simple all-in-one localhost Installation
+This assumes that you've installed the base dependencies and you're running on
+Fedora or RHEL
+```
+git clone https://github.com/openshift/openshift-ansible
+cd openshift-ansible
+sudo ansible-playbook -i inventory/hosts.localhost playbooks/prerequisites.yml
+sudo ansible-playbook -i inventory/hosts.localhost playbooks/deploy_cluster.yml
+```
+
+## Complete Production Installation Documentation:
 
 - [OpenShift Enterprise](https://docs.openshift.com/enterprise/latest/install_config/install/advanced_install.html)
 - [OpenShift Origin](https://docs.openshift.org/latest/install_config/install/advanced_install.html)

inventory/hosts.localhost

@@ -0,0 +1,26 @@
+#bare minimum hostfile
+
+[OSEv3:children]
+masters
+nodes
+etcd
+
+[OSEv3:vars]
+# if your target hosts are Fedora uncomment this
+#ansible_python_interpreter=/usr/bin/python3
+openshift_deployment_type=origin
+openshift_release=3.7
+osm_cluster_network_cidr=10.128.0.0/14
+openshift_portal_net=172.30.0.0/16
+osm_host_subnet_length=9
+# localhost likely doesn't meet the minimum requirements
+openshift_disable_check=disk_availability,memory_availability
+
+[masters]
+localhost ansible_connection=local
+
+[etcd]
+localhost ansible_connection=local
+
+[nodes]
+localhost  ansible_connection=local openshift_schedulable=true openshift_node_labels="{'region': 'infra', 'zone': 'default'}"