Adding and updating Linux SSH keys on Managed Services for Kubernetes node group hosts

Issue descriptionIssue description

• When running a Managed Service for Kubernetes cluster, you need to add a new Linux user on hosts of a cluster node of your Managed Service for Kubernetes cluster.
• When running a Managed Service for Kubernetes cluster, your need to update an SSH key for an existing Linux user on hosts of a cluster node of your Managed Service for Kubernetes cluster.

SolutionSolution

To add a user or update an SSH key for the current user, update the node group keys.
Before running this operation, prepare a file with SSH keys for your users in the following format:

username:ssh-ed25519 AAAAB3NzaC***********zo/lP1ww== username
username2:ssh-ed25519 ONEMOREkey***********88OavEHw== username2

Then use YC CLI to execute the command:

yc managed-kubernetes node-group add-metadata \
  --name <node_group_name> \
  --metadata-from-file ssh-keys=<path_to_file_with_public_ssh_keys>

As a result of this command, the following operations will be applied to the cluster's node group:

• SSH keys of existing users will be updated with the new ones.
• New users will be created with the given SSH keys.

When updating SSH keys, the node group will switch to Reconciling, because the VMs belonging to this group will run metadata update.