• get
  • get image
• set
  • update image
  • setup limits for deploy via command line
• replicas

[!TIP|label:reference:]

• A visual guide on troubleshooting Kubernetes deployments | pdf | cn pdf

get

• check origial

  $ k -n devops get deploy devops-jenkins -o wide
  NAME             READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS       IMAGES                  SELECTOR
  devops-jenkins   1/1     1            1           408d   devops-jenkins   jenkins/jenkins:2.199   app=devops-jenkins
  

get image

$ k -n jenkins get deploy jenkins -o jsonpath="{..image}"
jenkins/jenkins:2.346.2-lts

set

reference:

• Updating a Deployment
• Rolling Back a Deployment

format

$ kubectl -n <namespace> \
          set image \
          deploy <deploy_name> \
          <container_name>=<image_path> \
          [--record=true] \
          [kubernetes.io/change-cause="update cause"]

# check history
$ kubectl -n <namespace> \
          rollout history \
          deploy <deploy_name>

# revert
$ kubectl -n <namespace> \
          rollout undo \
          deploy <deploy_name> \
          --to-revision=<version>

update image

$ k -n devops set image deployments/devops-jenkins devops-jenkins=jenkins/jenkins:2.200
deployment.extensions/devops-jenkins image updated

# or
$ k -n devops set image deploy devops-jenkins devops-jenkins=jenkins/jenkins:2.200

• result

  $ k -n devops get pods -w
  NAME                              READY   STATUS    RESTARTS   AGE
  devops-jenkins-54d6db68ff-bz5b6   1/1     Running   0          6d17h
  devops-jenkins-6bdd4fc6dd-l9spp   0/1     Pending   0          0s
  devops-jenkins-6bdd4fc6dd-l9spp   0/1     Pending   0          0s
  devops-jenkins-6bdd4fc6dd-l9spp   0/1     ContainerCreating   0          0s
  devops-jenkins-6bdd4fc6dd-l9spp   1/1     Running             0          8s
  devops-jenkins-54d6db68ff-bz5b6   1/1     Terminating         0          6d17h
  devops-jenkins-54d6db68ff-bz5b6   0/1     Terminating         0          6d17h
  devops-jenkins-54d6db68ff-bz5b6   0/1     Terminating         0          6d17h
  devops-jenkins-54d6db68ff-bz5b6   0/1     Terminating         0          6d17h
  
  $ k -n devops get deploy -w
  NAME             READY   UP-TO-DATE   AVAILABLE   AGE
  devops-jenkins   1/1     1            1           22d
  devops-jenkins   1/1     1            1           22d
  devops-jenkins   1/1     1            1           22d
  devops-jenkins   1/1     0            1           22d
  devops-jenkins   1/1     1            1           22d
  devops-jenkins   2/1     1            2           22d
  devops-jenkins   1/1     1            1           22d
  
  $ k -n devops get deploy devops-jenkins -o yaml --export | grep image\:
  Flag --export has been deprecated, This flag is deprecated and will be removed in future.
          image: jenkins/jenkins:2.200
  
  $ k -n devops get po -o custom-columns='NAME:metadata.name,IMAGES:spec.containers[*].image'
  NAME                              IMAGES
  devops-jenkins-6bdd4fc6dd-l9spp   jenkins/jenkins:2.2000
  

setup limits for deploy via command line

$ k run <name> \
    --image=jenkins/jenkins:2.274 \
    -i \
    --tty \
    --limits='cpu=50m,memory=128Mi' \
    --requests='cpu=50m,memory=128Mi'

replicas

$ kubectl scale deploy <deploy_name>