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diff --git a/README_origin.md b/README_origin.md new file mode 100644 index 000000000..5b3fd2435 --- /dev/null +++ b/README_origin.md @@ -0,0 +1,210 @@ +# 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... +``` |