在 GKE 中的现有节点池上添加或编辑标签

Question

I created GKE cluster with node pool, but I forgot to label the nodes... In Google Cloud Platform UI I can't edit or add Kubernetes labels for the existing node pool... How can I do it without recreating whole node pool?

Answer 1

It isn't possible to edit the labels without recreating nodes, so GKE does not support updating labels on node pools.

In GKE, the Kubernetes labels are applied to nodes by the kubelet binary which receives them as flags passed in via the node startup script. As it is just as disruptive (or more disruptive) to recreate all nodes in a node pool as to create a new node pool, updating the labels isn't a supported operation for updating a node pool.

Answer 2

You can edit your node configuration, including labels, with kubectl :

kubectl edit node <your node name>

Use kubectl get node to get a list of your nodes. If you're having trouble connecting to your GKE cluster check out the docs here .

Answer 3

Make a new node pool that is the way you want, and then migrate your workload to it. Then destroy the old pool.

Depending on your workload, there could be a "blip" in your service as pods are moved to the new node.

I define two node pools: blue and green. At any given time only one pool is up.

If I need to make a change:

1. I make sure that automation of the down node pool matches at least the config of the up pool.
2. Then I make the change in the automation that I want in the downed pool.
3. Then I bring up that pool.
4. I baby-sit the migration of workloads to the new node pool using cordon / drain.
5. Then I destroy the old pool.
6. Then I make sure that the automation for the old , now down pool, matches the up new pool.

And I'm ready for my next change.

David

Answer 4

kubectl label node <node_id> <label_key>:<label_value>

这将允许您为任何已经运行的节点添加标签。