Openshift under Kubernetes
Deploys OpenShift Origin to an existing Kubernetes cluster. This is arguably the most ideal way to deploy OpenShift, for a few reasons:
- OpenShift Origin is a layer on top of Kubernetes
- Kubernetes is extremely flexible in the ways it can be deployed, with kube-up
- Allowing Kubernetes and OpenShift to be independently updated is ideal for feature iteration and stability
- This is much easier than dealing with Ansible under OpenShift v3.
This system requires the following things:
- A running working Kubernetes cluster.
- A kubeconfig for this cluster with long-term API authentication details at maximum administrative level.
- A Persistent Volume with at least 2Gi of space.
This is the process this system uses to deploy OpenShift:
- Fetch the ServiceAccount public key by creating a temporary namespace and pod.
- Create the
- Create a secret containing the kubeconfig with administrative access
- Create the "openshift" service and grab the internal and external addresses.
- Run openshift with the "--write-config" option to generate the initial default config in a temporary namespace.
- Use an existing
PersistentVolumecreated by the user.
- Create a
PersistentVolumeClaimto claim this storage.
- Create the single-node "etcd" cluster to store the openshift data.
- Create the OpenShift replication controller.
The cli allows you to interactively edit the config, among other features.
To install it:
$ pip install openshift-under-kubernetes
To use it:
$ openshift-under-kubernetes --help
This will output:
Usage: openshift-under-kubernetes [OPTIONS] COMMAND [ARGS]... Options: --config PATH kube config path --context TEXT kube context --openshift-version TEXT force openshift version (default 1.1.4) --secure / --no-secure enables https checking -y auto-answer for all confirmations --help Show this message and exit. Commands: addclusterrole Adds a CLUSTER role to a user by directly... deploy Deploy OpenShift to the cluster. deployregistry Deploy an OpenShift Registry to the cluster. editconfig Interactively edits master-config.yaml execute Executes any of the OpenShift commands inside... getconfig Writes the entire openshift config to a... info Show cluster information undeploy Removes OpenShift from the cluster.
You can get started by running
openshift-under-kubernetes info to check that the tool can properly communicate with your cluster. Then, use "deploy" to publish a new openshift cluster.