The final module of the Cluster Architecture, Installation, and Configuration is Implement etcd backup and restore. Let’s quickly perform the actions we need to complete this step for the exam.
Perform a Backup of etcd
While it’s still early and details of the CKA v1.19 environment aren’t known yet, I’m anticipating a small change to how etcd backup and restore is performed. If you’ve been preparing for the CKA before the September 2020 change to Kubernetes v1.19, you may know be familiar with the environment variable export ETCDCTL_API=3 to ensure you’re using version 3 of etcd’s API, which has the backup and restore capability. However, Kubernetes v1.19 ships with etcd 3.4.9 and in etcd 3.4.x, the default API version is 3 so this process is no longer necessary! If etcdctl version returns a version lower than 3.4.x, you will still need to set the API version to 3 for performing backup and restore operations.
As part of my goal to obtain the Certified Kubernetes Administrator (CKA) certification, I went through the Kubernetes documentation to find the specific links that map to the domain knowledge objectives for the v1.19 exam.
I’ve been slowly working towards CKA and there is a significant change to the curriculum with the recent announcement from the Cloud Native Computing Foundation (CNCF) that the Certified Kubernetes Administrator (CKA) exam curriculum will be updated in September 2020 to cover Kubernetes v1.19. The v1.19 curriculum is a huge change from the v1.18 curriculum I’ve been studying and I prepared this comparison to help with my studies and hope it provides some clarity to those in a similar situation as me.
Kubernetes v1.19 hasn’t been finalized yet but there will certainly be new features, added commands, and others deprecated as part of the update. But that’s not the only change — the exam curriculum is also changing a lot!