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Deploy Guestbook using CloneSet

This tutorial walks you through an example to install a guestbook application using CloneSet. The guestbook app used is from this repo.

Installing the Guestbook application

# install Redis by CloneSet
$ kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/docs/tutorial/v1/cloneset-redis.yaml
service/redis-master created
service/redis-slave created
cloneset.apps.kruise.io/redis-master created
cloneset.apps.kruise.io/redis-slave created

# install Guestbook by CloneSet
$ kubectl apply -f https://raw.githubusercontent.com/kruiseio/kruise/master/docs/tutorial/v1/cloneset-guestbook.yaml
service/guestbook-clone-svc created
cloneset.apps.kruise.io/guestbook-clone created

Verify Guestbook Started

Check the guestbook are started. cloneset.apps.kruise.io or shortname clone is the resource kind.

$ kubectl get clone
NAME              DESIRED   UPDATED   UPDATED_READY   READY   TOTAL   AGE
guestbook-clone   20        20        20              20      20      11m
redis-master      1         1         1               1       1       11m
redis-slave       2         2         2               2       2       11m

View the Guestbook

You can now view the Guestbook on browser.

To view the guestbook on a remote host, locate the external IP of the application in the IP column of the kubectl get services output.

$ kubectl get svc guestbook-clone-svc
NAME                  TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                         AGE
guestbook-clone-svc   LoadBalancer   172.27.11.131   47.114.8.230   3000:32185/TCP,4000:30664/TCP   11m

47.114.8.230 is the external IP. Visit http://47.114.8.230:3000 for the guestbook UI. Guestbook

Scale app

Scale out

$ kubectl scale --replicas=25 clone guestbook-clone
cloneset.apps.kruise.io/guestbook-clone scaled

Scale in with specified Pods

Use kubectl edit clone guestbook-clone, modify replicas and podsToDelete

spec:
  replicas: 22
  scaleStrategy:
    podsToDelete:
    - guestbook-clone-k9796
    - guestbook-clone-nkn52
    - guestbook-clone-w9qgl

Update Pods

Currently Pods:

$ kubectl get pod -l app.kubernetes.io/name=guestbook-clone -L controller-revision-hash
NAME                    READY   STATUS    RESTARTS   AGE    CONTROLLER-REVISION-HASH
guestbook-clone-4b8mj   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-4pwvg   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-5rsvj   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-64xzp   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-bk2fc   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-djlpq   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-hvcxp   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-jkvgs   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-jnmjq   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-jrj5p   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-lfwdf   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-lg58s   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-lrvhl   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-mg5gk   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-n79kz   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-n99zj   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-prtlk   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-psfdn   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-qs4cp   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-r7ms9   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-rtfvb   1/1     Running   0          108s   guestbook-clone-64598d67b
guestbook-clone-wtm9k   1/1     Running   0          108s   guestbook-clone-64598d67b

Edit the CloneSet, set image to openkruise/guestbook:v2 and partition=15:

spec:
  # ...
  template:
    spec:
      containers:
      - name: guestbook
        image: openkruise/guestbook:v2
      # ...
  updateStrategy:
    partition: 15

Because of the default value of maxUnavailable is 20% and currently replicas is 22, so the maximum number of not-ready pods during updating is 5.

Controller will update 7 Pods to v2 image:

$ kubectl get clone guestbook-clone
NAME              DESIRED   UPDATED   UPDATED_READY   READY   TOTAL   AGE
guestbook-clone   22        7         7               22      22      52m

$ kubectl get pod -l app.kubernetes.io/name=guestbook-clone -L controller-revision-hash
NAME                    READY   STATUS    RESTARTS   AGE     CONTROLLER-REVISION-HASH
guestbook-clone-4b8mj   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-4pwvg   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-5rsvj   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-64xzp   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-bk2fc   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-djlpq   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-hvcxp   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-jkvgs   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-jnmjq   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-jrj5p   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-lfwdf   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-lg58s   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-lrvhl   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-mg5gk   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-n79kz   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-n99zj   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-prtlk   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-psfdn   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-qs4cp   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-r7ms9   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9
guestbook-clone-rtfvb   1/1     Running   0          2m39s   guestbook-clone-64598d67b
guestbook-clone-wtm9k   1/1     Running   1          2m39s   guestbook-clone-56dfcdfff9

# we can also use the `cloneset.status.updateRevision` to list latest Pods
$ kubectl get pod -l app.kubernetes.io/name=guestbook-clone,controller-revision-hash=guestbook-clone-56dfcdfff9
NAME                    READY   STATUS    RESTARTS   AGE
guestbook-clone-jrj5p   1/1     Running   1          5m29s
guestbook-clone-lfwdf   1/1     Running   1          5m29s
guestbook-clone-lrvhl   1/1     Running   1          5m29s
guestbook-clone-mg5gk   1/1     Running   1          5m29s
guestbook-clone-n79kz   1/1     Running   1          5m29s
guestbook-clone-r7ms9   1/1     Running   1          5m29s
guestbook-clone-wtm9k   1/1     Running   1          5m29s

Then we update partition to 0, which means we expect all Pods to be updated. Also, we set maxUnavailable to 10, which helps us put on speed for updating.

spec:
  updateStrategy:
    partition: 0
    maxUnavailable: 10

Finally, all Pods have been updated to guestbook-clone-56dfcdfff9:

$ kubectl get clone guestbook-clone
NAME              DESIRED   UPDATED   UPDATED_READY   READY   TOTAL   AGE
guestbook-clone   22        22        22              22      22      59m

$ kubectl get pod -l app.kubernetes.io/name=guestbook-clone,controller-revision-hash=guestbook-clone-56dfcdfff9
NAME                    READY   STATUS    RESTARTS   AGE
guestbook-clone-4b8mj   1/1     Running   1          9m53s
guestbook-clone-4pwvg   1/1     Running   1          9m53s
guestbook-clone-5rsvj   1/1     Running   1          9m53s
guestbook-clone-64xzp   1/1     Running   1          9m53s
guestbook-clone-bk2fc   1/1     Running   1          9m53s
guestbook-clone-djlpq   1/1     Running   1          9m53s
guestbook-clone-hvcxp   1/1     Running   1          9m53s
guestbook-clone-jkvgs   1/1     Running   1          9m53s
guestbook-clone-jnmjq   1/1     Running   1          9m53s
guestbook-clone-jrj5p   1/1     Running   1          9m53s
guestbook-clone-lfwdf   1/1     Running   1          9m53s
guestbook-clone-lg58s   1/1     Running   1          9m53s
guestbook-clone-lrvhl   1/1     Running   1          9m53s
guestbook-clone-mg5gk   1/1     Running   1          9m53s
guestbook-clone-n79kz   1/1     Running   1          9m53s
guestbook-clone-n99zj   1/1     Running   1          9m53s
guestbook-clone-prtlk   1/1     Running   1          9m53s
guestbook-clone-psfdn   1/1     Running   1          9m53s
guestbook-clone-qs4cp   1/1     Running   1          9m53s
guestbook-clone-r7ms9   1/1     Running   1          9m53s
guestbook-clone-rtfvb   1/1     Running   1          9m53s
guestbook-clone-wtm9k   1/1     Running   1          9m53s

Uninstall

$ kubectl delete -f https://raw.githubusercontent.com/kruiseio/kruise/master/docs/tutorial/v1/cloneset-guestbook.yaml
service "guestbook-clone-svc" deleted
cloneset.apps.kruise.io "guestbook-clone" deleted

$ kubectl delete -f https://raw.githubusercontent.com/kruiseio/kruise/master/docs/tutorial/v1/cloneset-redis.yaml
service "redis-master" deleted
service "redis-slave" deleted
cloneset.apps.kruise.io "redis-master" deleted
cloneset.apps.kruise.io "redis-slave" deleted