Updating Deployments
In this lesson, we will learn to update the Kubernetes Deployments.
Updating the db Image
Let’s see what happens when we set a new image to the db Pod.
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kubectl set image \-f deploy/go-demo-2-db.yml \db=mongo:3.4 \--record
It’ll take a while until the new image is pulled.
Describing the Deployment
Once it’s done, we can describe the Deployment by checking the events it created.
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kubectl describe \-f deploy/go-demo-2-db.yml
The last few lines of the output are as follows.
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...Events:Type Reason Age From Message---- ------ ---- ---- -------Normal ScalingReplicaSet 19m deployment-controller Scaled up replica set go-demo-2-db-75fbcbb5cd to 1Normal ScalingReplicaSet 5m deployment-controller Scaled up replica set go-demo-2-db-f8d4b86ff to 1Normal ScalingReplicaSet 0s deployment-controller Scaled down replica set go-demo-2-db-75fbcbb5cd to 0
We can see that it created a new ReplicaSet and that it scaled the old ReplicaSet to 0. If, in your case, the last line did not appear, you’ll need to wait until the new version of the mongo image is pulled.
Instead of operating directly on the level of Pods, the Deployment created a new ReplicaSet which, in turn, produced Pods based on the new ...
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