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Day 2 Operations

NOTE: The steps listed here were contributed by a community member, and is not officially supported. Please use at your own risk.

The steps listed on this page describe a way to modify a running Kubernetes cluster deployed with aks-engine on Azure. These steps are only tested with changes targeting actually Azure resources. Changes made to Kubernetes configuration are not tested yet.

generate and deploy

These are the common steps (unless described otherwise) you'll have to run after modifying an existing apimodel.json file.

  • Modify the apimodel.json file located in the _output/<clustername> folder

  • Run aks-engine generate --api-model _output/<clustername>/apimodel.json. This wil update the azuredeploy* files needed for the new ARM deployment. These files are also located in the _output folder.

  • Apply the changes by manually starting an ARM deployment. From within the _output/<clustername> run

      az group deployment create --template-file azuredeploy.json --parameters azuredeploy.parameters.json --resource-group "<my-resource-group>"

    To use the az CLI tools you have to login. More info can be found here: https://docs.microsoft.com/en-us/cli/azure/authenticate-azure-cli?view=azure-cli-latest

    _Note: I use az group deployment instead of aks-engine deploy because the latter seems to assume you are deploying a new cluster and as a result overwriting you private ssh keys located in the ouput folder

  • Grab a coffee

  • Profit!

Common scenarios (tested)

Adding a node pool

Add (or copy) an entry in the agentPoolProfiles array.

Removing a node pool

  • Delete the related entry from agentPoolProfiles section in the _output/<clustername>/api-model.json file
  • Drain nodes from inside Kubernetes
  • generate and deploy (see above)
  • Delete VM's and related resources (disk, NIC, availability set) from Azure portal
  • Remove the pool from the original apimodel.json file

Resizing a node pool

Use the aks-engine scale command

aks-engine scale   --location westeurope --subscription-id "xxx" --resource-group "<my-resource-group" \
--deployment-dir ./_output/<clustername> --node-pool <nodepool name> --new-node-count <desired number of nodes> --master-FQDN <fqdn of the master lb>

Remember to also update your original api-model.json file (used for 1st deployment) or else you would end up with the original number of VM's after using the generate command described above

Resize VM's in existing agent pool

  • Modify the vmSize in the agentPoolProfiles section
  • generate and deploy (see above)

Important: The default ARM deployment won't drain your Kubernetes nodes properly before 'rebooting' them. Please drain them manually before deploying the change