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upgrade-kubernetes.md

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Upgrade Kubernetes

Upgrade from v1.20.12 to v1.21.7

Upgrade step

  • SSH to deployer node
ssh [email protected]
  • Go to kubernetes-hardway-ansible directory, checkout to master
git fetch --all
git checkout --track origin/v1.21.7
  • Adjust variable in the group_vars
vi group_vars/all.yml
  • Adjust Kubernetes host and nodes
vi hosts/hosts
  • Run ansible
ansible-playbook upgrade-kubernetes.yml -i hosts/hosts
  • Verify version
kubectl version
kubectl get nodes

kubectl describe deployment coredns --namespace kube-system | grep Image
kubectl get daemonset kube-flannel-ds --namespace kube-system -o=jsonpath='{$.spec.template.spec.containers[:1].image}'

Upgrade from v1.19.10 to 1.20.12

Please note that upgrading from v1.19.10 to v1.20.12 will also upgrade flannel, coredns, and metrics-server. Please test in staging or testing cluster before upgrading.

Upgrade step

  • SSH to deployer node
ssh [email protected]
  • Go to kubernetes-hardway-ansible directory, checkout to master
git fetch --all
git checkout --track origin/v1.20.12
  • Adjust variable in the group_vars
vi group_vars/all.yml
  • Adjust Kubernetes host and nodes
vi hosts/hosts
  • Run ansible
ansible-playbook upgrade-kubernetes.yml -i hosts/hosts
  • Verify version
kubectl version
kubectl get nodes

kubectl describe deployment coredns --namespace kube-system | grep Image
kubectl get daemonset kube-flannel-ds --namespace kube-system -o=jsonpath='{$.spec.template.spec.containers[:1].image}'

Upgrade from v1.18.7 to 1.19.10

Please note that upgrading from v1.18.7 to v1.19.10 will also upgrade flannel, coredns, and metrics-server. Please test in staging or testing cluster before upgrading.

Upgrade step

  • SSH to deployer node
ssh [email protected]
  • Go to kubernetes-hardway-ansible directory, checkout to master
git fetch --all
git checkout --track origin/v1.19.10
  • Adjust variable in the group_vars
vi group_vars/all.yml
  • Adjust Kubernetes host and nodes
vi hosts/hosts
  • Run ansible
ansible-playbook upgrade-kubernetes.yml -i hosts/hosts
  • Verify version
kubectl version
kubectl get nodes

kubectl describe deployment coredns --namespace kube-system | grep Image
kubectl get daemonset kube-flannel-ds --namespace kube-system -o=jsonpath='{$.spec.template.spec.containers[:1].image}'

Upgrade from v1.18.6 to v1.18.7

Upgrading to 1.18.7 is breaking change from 1.18.6 because there is a change in the PKI. in 1.18.6 I use Kelsey Kubernetes hard way to generate the PKI. We try to move into the best practice guide https://kubernetes.io/docs/setup/best-practices/certificates.

group_vars Change log:

  • add kubernetes.components.encryptionProvider
  • add infrastructure.ca.intermediateExpireTime

currently there is no way to upgrade from v1.18.6 to v1.18.7 because there is a problem with etcd.