Rollback Kubernetes deployments with Azure DevOps pipelines https://adrianbumbas.com/rollback-kubernetes-deployments-with-azure-devops-pipelines/

apply.task.yaml

- task: Kubernetes@1
  name: 'apply'
  inputs:
    connectionType: 'Kubernetes Service Connection'
    kubernetesServiceEndpoint: 'test'
    namespace: 'default'
    command: 'apply'
    arguments: '-f deployment.yaml'
    secretType: 'dockerRegistry'
    containerRegistryType: 'Azure Container Registry'
    outputFormat: "jsonpath={$.metadata.name}"

azure-pipelines.yaml

trigger:
- master

jobs:    
- job: Deploy_to_AKS
  pool:
    vmImage: 'ubuntu-latest'
  steps:
  - task: Kubernetes@1
    name: 'apply'
    inputs:
      connectionType: 'Kubernetes Service Connection'
      kubernetesServiceEndpoint: 'test'
      namespace: 'default'
      command: 'apply'
      arguments: '-f deployment.yaml'
      secretType: 'dockerRegistry'
      containerRegistryType: 'Azure Container Registry'
      outputFormat: "jsonpath={$.metadata.name}"
      
  - task: Kubernetes@1
    name: rollout_status
    inputs:
      connectionType: 'Kubernetes Service Connection'
      kubernetesServiceEndpoint: 'test'
      namespace: 'default'
      command: rollout
      arguments: status deployment/$(apply.KubectlOutput)
      secretType: 'dockerRegistry'
      containerRegistryType: 'Azure Container Registry'

  - task: Kubernetes@1
    name: rollout_undo
    condition: failed()
    inputs:
      connectionType: 'Kubernetes Service Connection'
      kubernetesServiceEndpoint: 'test'
      namespace: 'default'
      command: rollout
      arguments: undo deployment/$(apply.KubectlOutput)
      secretType: 'dockerRegistry'
      containerRegistryType: 'Azure Container Registry'

deployment.working.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-kubernetes
spec:
  replicas: 3
  progressDeadlineSeconds: 120
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 0
      maxSurge: 1
  selector:
    matchLabels:
      app: hello-kubernetes
  template:
    metadata:
      labels:
        app: hello-kubernetes
    spec:
      containers:
      - name: hello-kubernetes
        image: gcr.io/google-samples/hello-app:1.0
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /
            port: 8080

deployment.wrong.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-kubernetes
spec:
  replicas: 3
  progressDeadlineSeconds: 120
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 0
      maxSurge: 1
  selector:
    matchLabels:
      app: hello-kubernetes
  template:
    metadata:
      labels:
        app: hello-kubernetes
    spec:
      containers:
      - name: hello-kubernetes
        # change here the image
        image: ngnix:latest
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /
            port: 8080

rollout.status.task.yaml

- task: Kubernetes@1
    name: rollout_status
    inputs:
      connectionType: 'Kubernetes Service Connection'
      kubernetesServiceEndpoint: 'test'
      namespace: 'default'
      command: rollout
      arguments: status deployment/$(apply.KubectlOutput)
      secretType: 'dockerRegistry'
      containerRegistryType: 'Azure Container Registry'

rollout.undo.task.yaml

- task: Kubernetes@1
    name: rollout_undo
    # conditional execution
    condition: failed()
    inputs:
      connectionType: 'Kubernetes Service Connection'
      kubernetesServiceEndpoint: 'test'
      namespace: 'default'
      command: rollout
      arguments: undo deployment/$(apply.KubectlOutput)
      secretType: 'dockerRegistry'
      containerRegistryType: 'Azure Container Registry'