Chapter 4. Deploying Containerized Storage in Converged Mode

The cluster installation, https://access.redhat.com/documentation/en-us/openshift_container_platform/3.10/html-single/installing_clusters/#install-planning, process can be used to install one or both of two GlusterFS node groups:

It is recommended to deploy both groups to avoid potential impacts on performance in I/O and volume creation. Both of these are defined in the inventory hosts file.

The definition of the clusters is done by including the relevant names in the [OSEv3:children] group, creating similarly named groups, and then populating the groups with the node information. The clusters can then be configured through a variety of variables in the [OSEv3:vars] group. glusterfs variables begin with openshift_storage_glusterfs_ and glusterfs-registry variables begin with openshift_storage_glusterfs_registry_. A few other variables, such as openshift_hosted_registry_storage_kind, interact with the GlusterFS clusters.

It is recommended to specify image names and version tags for all containerized components. This is primarily to prevent components, particularly the Red Hat Gluster Storage pods, from upgrading after an outage which may lead to a cluster of widely disparate software versions. The relevant variables are:

The following are the recommended values for this release of Red Hat Openshift Container Storage

For a complete list of variables, see the GlusterFS role README, https://github.com/openshift/openshift-ansible/tree/master/roles/openshift_storage_glusterfs, on GitHub.

Once the variables are configured, there are several playbooks available depending on the circumstances of the installation: