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+# Installing OpenShift Origin against existing hosts
+
+* [Requirements](#requirements)
+* [Caveats](#caveats)
+* [Known Issues](#known-issues)
+* [Configuring the host inventory](#configuring-the-host-inventory)
+* [Creating the default variables for the hosts and host groups](#creating-the-default-variables-for-the-hosts-and-host-groups)
+* [Running the ansible playbooks](#running-the-ansible-playbooks)
+* [Post-ansible steps](#post-ansible-steps)
+* [Overriding detected ip addresses and hostnames](#overriding-detected-ip-addresses-and-hostnames)
+
+## Requirements
+* ansible
+  * Tested using ansible-1.8.4-1.fc20.noarch, but should work with version 1.8+
+  * There is currently a known issue with ansible-1.9.0, you can downgrade to 1.8.4 on Fedora by installing one of the builds from Koji: http://koji.fedoraproject.org/koji/packageinfo?packageID=13842
+  * Available in Fedora channels
+  * Available for EL with EPEL and Optional channel
+* One or more RHEL 7.1 or CentOS 7.1 VMs
+* Either ssh key based auth for the root user or ssh key based auth for a user
+  with sudo access (no password)
+* A checkout of openshift-ansible from https://github.com/openshift/openshift-ansible/
+  
+  ```sh
+  git clone https://github.com/openshift/openshift-ansible.git
+  cd openshift-ansible
+  ```
+## Known Issues
+* RHEL - Host subscriptions are not configurable yet, the hosts need to be
+  pre-registered with subscription-manager or have the RHEL base repo
+  pre-configured. If using subscription-manager the following commands will
+  disable all but the rhel-7-server rhel-7-server-extras and
+  rhel-server7-ose-beta repos:
+```sh
+subscription-manager repos --disable="*"
+subscription-manager repos \
+--enable="rhel-7-server-rpms" \
+--enable="rhel-7-server-extras-rpms" \
+--enable="rhel-server-7-ose-beta-rpms"
+```
+* Configuration of router is not automated yet
+* Configuration of docker-registry is not automated yet
+
+## Configuring the host inventory
+[Ansible docs](http://docs.ansible.com/intro_inventory.html)
+
+Example inventory file for configuring one master and two nodes for the test
+environment. This can be configured in the default inventory file
+(/etc/ansible/hosts), or using a custom file and passing the --inventory
+option to ansible-playbook.
+
+/etc/ansible/hosts:
+```ini
+# This is an example of a bring your own (byo) host inventory
+
+# Create an OSEv3 group that contains the masters and nodes groups
+[OSv3:children]
+masters
+nodes
+
+# Set variables common for all OSEv3 hosts
+[OSv3:vars]
+# SSH user, this user should allow ssh based auth without requiring a password
+ansible_ssh_user=root
+
+# If ansible_ssh_user is not root, ansible_sudo must be set to true
+#ansible_sudo=true
+
+deployment_type=origin
+
+# host group for masters
+[masters]
+osv3-master.example.com
+
+# host group for nodes
+[nodes]
+osv3-node[1:2].example.com
+```
+
+The hostnames above should resolve both from the hosts themselves and
+the host where ansible is running (if different).
+
+## Running the ansible playbooks
+From the openshift-ansible checkout run:
+```sh
+ansible-playbook playbooks/byo/config.yml
+```
+**Note:** this assumes that the host inventory is /etc/ansible/hosts, if using a different
+inventory file use the -i option for ansible-playbook.
+
+## Post-ansible steps
+#### Create the default router
+On the master host:
+```sh
+openshift ex router --create=true \
+  --credentials=/var/lib/openshift/openshift.local.certificates/openshift-router/.kubeconfig
+```
+
+#### Create the default docker-registry
+On the master host:
+```sh
+openshift ex registry --create=true \
+  --credentials=/var/lib/openshift/openshift.local.certificates/openshift-registry/.kubeconfig \
+  --mount-host=/var/lib/openshift/docker-registry
+```
+
+## Overriding detected ip addresses and hostnames
+Some deployments will require that the user override the detected hostnames
+and ip addresses for the hosts. To see what the default values will be you can
+run the openshift_facts playbook:
+```sh
+ansible-playbook playbooks/byo/openshift_facts.yml
+```
+The output will be similar to:
+```
+ok: [10.3.9.45] => {
+    "result": {
+        "ansible_facts": {
+            "openshift": {
+                "common": {
+                    "hostname": "jdetiber-osev3-ansible-005dcfa6-27c6-463d-9b95-ef059579befd.os1.phx2.redhat.com",
+                    "ip": "172.16.4.79",
+                    "public_hostname": "jdetiber-osev3-ansible-005dcfa6-27c6-463d-9b95-ef059579befd.os1.phx2.redhat.com",
+                    "public_ip": "10.3.9.45",
+                    "use_openshift_sdn": true
+                },
+                "provider": {
+                  ... <snip> ...
+                }
+            }
+        },
+        "changed": false,
+        "invocation": {
+            "module_args": "",
+            "module_name": "openshift_facts"
+        }
+    }
+}
+ok: [10.3.9.42] => {
+    "result": {
+        "ansible_facts": {
+            "openshift": {
+                "common": {
+                    "hostname": "jdetiber-osev3-ansible-c6ae8cdc-ba0b-4a81-bb37-14549893f9d3.os1.phx2.redhat.com",
+                    "ip": "172.16.4.75",
+                    "public_hostname": "jdetiber-osev3-ansible-c6ae8cdc-ba0b-4a81-bb37-14549893f9d3.os1.phx2.redhat.com",
+                    "public_ip": "10.3.9.42",
+                    "use_openshift_sdn": true
+                },
+                "provider": {
+                  ...<snip>...
+                }
+            }
+        },
+        "changed": false,
+        "invocation": {
+            "module_args": "",
+            "module_name": "openshift_facts"
+        }
+    }
+}
+ok: [10.3.9.36] => {
+    "result": {
+        "ansible_facts": {
+            "openshift": {
+                "common": {
+                    "hostname": "jdetiber-osev3-ansible-bc39a3d3-cdd7-42fe-9c12-9fac9b0ec320.os1.phx2.redhat.com",
+                    "ip": "172.16.4.73",
+                    "public_hostname": "jdetiber-osev3-ansible-bc39a3d3-cdd7-42fe-9c12-9fac9b0ec320.os1.phx2.redhat.com",
+                    "public_ip": "10.3.9.36",
+                    "use_openshift_sdn": true
+                },
+                "provider": {
+                    ...<snip>...
+                }
+            }
+        },
+        "changed": false,
+        "invocation": {
+            "module_args": "",
+            "module_name": "openshift_facts"
+        }
+    }
+}
+```
+Now, we want to verify the detected common settings to verify that they are
+what we expect them to be (if not, we can override them).
+
+* hostname
+  * Should resolve to the internal ip from the instances themselves.
+  * openshift_hostname will override.
+* ip
+  * Should be the internal ip of the instance.
+  * openshift_ip will override.
+* public hostname
+  * Should resolve to the external ip from hosts outside of the cloud
+  * provider openshift_public_hostname will override.
+* public_ip
+  * Should be the externally accessible ip associated with the instance
+  * openshift_public_ip will override
+* use_openshift_sdn
+  * Should be true unless the cloud is GCE.
+  * openshift_use_openshift_sdn overrides
+
+To override the the defaults, you can set the variables in your inventory:
+```
+...snip...
+[masters]
+osv3-master.example.com openshift_ip=1.1.1.1 openshift_hostname=osv3-master.example.com openshift_public_ip=2.2.2.2 openshift_public_hostname=osv3-master.public.example.com
+...snip...
+```