Simple script to upgrade AKS Node Pools.
Node Pools Kubernetes version can't be higher that Control Plane Kubernetes version.
> Control Plane K8s version
$ kubectl version --short | grep -i server
Server Version: v1.21.1
> Node Pools K8s version
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
aks-agentpool-21878470-vmss000000 Ready agent 44m v1.20.7
aks-demopool-21878470-vmss000000 Ready agent 43m v1.20.7
> Azure related
export ARM_CLIENT_ID=<> ;\
export ARM_CLIENT_SECRET=<> ;\
export ARM_TENANT_ID=<> ;\
export ARM_SUBSCRIPTION_ID=<>
> K8s related
export RESOURCE_GROUP_NAME=<> ;\
export CLUSTER_NAME=<> ;\
export KUBERNETES_NODE_VERSION=<>
> more details (help)
$ ./npupgrade.sh
$ az aks list --output table
$ az aks nodepool list --cluster-name $CLUSTER_NAME --resource-group $RESOURCE_GROUP_NAME --output table
Name OsType VmSize Count MaxPods ProvisioningState Mode
--------- -------- ------------ ------- --------- ------------------- ------
agentpool Linux Standard_B2s 1 110 Succeeded System
demopool Linux Standard_B2s 1 110 Succeeded User
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
aks-agentpool-21878470-vmss000000 Ready agent 44m v1.20.7
aks-demopool-21878470-vmss000000 Ready agent 43m v1.20.7
$ ./npupgrade.sh upgrade demopool
(...)
$ ./npupgrade.sh status demopool
--- Checking status.. ---
Cluster Provisioning State is Succeeded
Node Pool Provisioning State is Upgrading
$ az aks nodepool list --cluster-name $CLUSTER_NAME --resource-group $RESOURCE_GROUP_NAME --output table
Name OsType VmSize Count MaxPods ProvisioningState Mode
--------- -------- ------------ ------- --------- ------------------- ------
agentpool Linux Standard_B2s 1 110 Succeeded System
demopool Linux Standard_B2s 1 110 Upgrading User
$ ./npupgrade.sh status demopool
--- Checking status.. ---
Cluster Provisioning State is Succeeded
Node Pool Provisioning State is Succeeded
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
aks-agentpool-21878470-vmss000000 Ready agent 81m v1.20.7
aks-demopool-21878470-vmss000000 Ready agent 4m46s v1.21.1
