Updating a DaemonSet

Learn the DaemonSet rolling update strategy.

Updating

DaemonSets have two update strategies:

RollingUpdate (default): nodes are updated one by one; maxUnavailable sets how many nodes may be without the agent at once.
OnDelete: nothing happens when the template changes; when a pod is deleted by hand, the new one is created with the new template. It's used for controlled updates of critical components like network plugins.

spec:
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1

kubectl set image ds/node-exporter exporter=prom/node-exporter:v1.8.3 -n izleme
kubectl rollout status ds/node-exporter -n izleme

History and rollback

A DaemonSet also keeps a rollout history and is rolled back with the same commands as a Deployment:

$ kubectl rollout history ds/node-exporter -n izleme
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
$ kubectl rollout undo ds/node-exporter -n izleme
daemonset.apps/node-exporter rolled back

Exercise Update the agent

Write three commands: set the image of the exporter container in the node-exporter DaemonSet in the izleme namespace to prom/node-exporter:v1.8.3; wait for the rollout to finish; show the history.

Show example solution

kubectl set image ds/node-exporter exporter=prom/node-exporter:v1.8.3 -n izleme
kubectl rollout status ds/node-exporter -n izleme
kubectl rollout history ds/node-exporter -n izleme

Test yourself

Under the OnDelete strategy, what happens when the image is changed?
- All update immediately
- The DaemonSet is deleted
- It errors
- Running pods don't change; ones deleted by hand are created with the new image
Show answer

Running pods don't change; ones deleted by hand are created with the new image — The operator decides the timing and order of the update.

Set the update to be triggered by hand.

spec:
  updateStrategy:
    type: ____

Show answer

spec:
  updateStrategy:
    type: OnDelete

Match.

RollingUpdate

Update node by node
OnDelete

Update when deleted by hand
maxUnavailable

Limit on agentless nodes
rollout undo ds/

Roll back

Next lesson: Summary - DaemonSet

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