CKS upgrade kubernetes

major    minor    patch
 1    .   24    .   0

Upgrade Master Node procedure

• drain and cordon (make it unschedulable) node
• kubeadm
• kube-apiserver
• controller-manager
• scheduler

then:

• kubelet (can be -2 minor version behind kube-apiserver)
• kube-proxy

Components same minor version as kube-apiserver

Upgrade Node procedure

1. Safely evicts all pods from node

kubectl drain

Mark node as SchedulingDisabled

kubectl cordon

1. Do the upgrade procedure …

2. Unmark node as SchedulingDisabled

kubectl uncordon

Notice

• pod gracePeriod / Terminating state
• pod Lifecycle Events
• PodDisruptionBudget