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Hello! This is Mumshad Mannambeth



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and we are going through the Certified Kubernetes Administrators Course. In this lecture



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we discuss about Cluster maintenance related topics.



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We start by looking at operating system upgrades.



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We see the implications of losing a node from the cluster where we take a node out of the cluster on



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purpose like for applying patches or upgrades on the OS itself.



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We then look at the cluster upgrade process.



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But before we do that, we need to know a little bit about kubernetes releases and versions.



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And the best practices around upgrading, when to upgrade, what version to upgrade to etc.



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So we look at that first.



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Once you learn the upgrade procedure, you are asked to upgrade a cluster by yourself.



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You will perform an end to an upgrade of a cluster yourself with live applications running on them.



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And finally we look at some of the backup and restore methodologies. You will practice



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a disaster scenario where you take a backup of the kubernetes cluster, then go through a  simulated



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disaster and then you're asked to recover from that disaster and bring the cluster back to the previous



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state.



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Well fun stuff coming up so let's get started.