Upgrade a cluster running on Oracle Cloud Infrastructure (OCI). Use this to upgrade a cluster from Oracle CNE Release 1 to Release 2

The steps to upgrade a Release 1 cluster to Release 2 are:

1. Set up OCI.

2. Create a Release 2 cluster configuration file.

3. Create an Oracle Container Host for Kubernetes (OCK) image.

4. Create Ignition files.

5. Decide the order of the nodes to upgrade.

   Important:

   The control planes nodes must be upgraded first, then worker nodes.

   Upgrade one node at a time. For each node in the cluster:

   1. Drain the node, and reset the node.

   2. Add the node back into the cluster using the Release 2 Ignition configuration.

   3. Replace the boot volume and reboot the node. The node is joined to the cluster, using the Release 2 OS, as the appropriate role.

   4. Uncordon the node.

   5. Validate the node is upgraded.