Add blue green deployment example app

2018-07-03 21:46:43 -07:00
1 parent 852d97d96e
commit bdc5d18f9f
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+# This workflow performs a "blue-green" deployment, while preserving the original deployment object
+# and name. It accomplishes this by temporarily redirecting traffic to a *clone* of the original
+# deployment, then after upgrading the original deployment to a later version, transfering traffic
+# back to the original (now upgraded) deployment.
+apiVersion: argoproj.io/v1alpha1
+kind: Workflow
+metadata:
+  generateName: k8s-bluegreen-
+spec:
+  entrypoint: k8s-bluegreen
+  arguments:
+    parameters:
+    - name: deployment-name
+    - name: service-name
+    - name: new-deployment-manifest
+    - name: new-service-manifest
+ 
+  templates:
+  - name: k8s-bluegreen
+    steps:
+    # 1. Create a parallel Kubernetes deployment with tweaks to name and selectors
+    - - name: create-blue-deployment
+        template: clone-deployment
+
+    # 2. Wait for parallel deployment to become ready
+    - - name: wait-for-blue-deployment
+        template: wait-deployment-ready
+        arguments:
+          parameters:
+          - name: deployment-name
+            value: '{{workflow.parameters.deployment-name}}-blue'
+
+    # 3. Patch the named service to point to the parallel deployment app
+    - - name: switch-service-to-blue-deployment
+        template: patch-service
+
+    # 4. Update the original deployment (receiving no traffic) with a new version
+    - - name: apply-green-deployment
+        template: apply-manifest
+        arguments:
+          parameters:
+          - name: manifest
+            value: '{{workflow.parameters.new-deployment-manifest}}'
+
+    # 5. Wait for the original deployment, now updated, to become ready
+    - - name: wait-for-green-deployment
+        template: wait-deployment-ready
+        arguments:
+          parameters:
+          - name: deployment-name
+            value: '{{workflow.parameters.deployment-name}}'
+
+    # dummy approval step for demo purposes. Sleeps for 30 seconds
+    - - name: approve
+        template: approve
+
+    # 6. Patch the named service to point to the original, now updated app
+    - - name: switch-service-to-green-deployment
+        template: apply-manifest
+        arguments:
+          parameters:
+          - name: manifest
+            value: '{{workflow.parameters.new-service-manifest}}'
+
+    # 7. Remove the cloned deployment (no longer receiving traffic)
+    - - name: delete-cloned-deployment
+        template: delete-deployment
+
+# end of steps
+
+  # clone deployment creates a "blue" clone of an existing deployment.
+  # -blue is appended to the metadata.name, as well as the values in the spec.selector.matchLabels,
+  # and spec.template.metadata.labels
+  - name: clone-deployment
+    container:
+      image: argoproj/argoexec:v2.1.1
+      command: [sh, -c, -x]
+      args:
+      - kubectl get --export -o json deployment.apps/{{workflow.parameters.deployment-name}} > /tmp/original-deploy &&
+        jq -r '.metadata.name+="-blue" |
+               .spec.template.metadata.labels += (.spec.template.metadata.labels | to_entries | map(select(.key != "applications.argoproj.io/app-name")) | map(.value+="-blue") | from_entries) |
+               .spec.selector.matchLabels += (.spec.selector.matchLabels | to_entries | map(select(.key != "applications.argoproj.io/app-name")) | map(.value+="-blue") | from_entries)'
+            /tmp/original-deploy > /tmp/cloned-deploy &&
+        cat  /tmp/cloned-deploy &&
+        kubectl apply -o yaml -f /tmp/cloned-deploy
+
+  - name: apply-manifest
+    inputs:
+      parameters:
+      - name: manifest
+    resource:
+      action: apply
+      manifest: '{{inputs.parameters.manifest}}'
+
+  - name: wait-deployment-ready
+    inputs:
+      parameters:
+      - name: deployment-name
+    container:
+      image: argoproj/argoexec:v2.1.1
+      command: [kubectl, rollout, status, --watch=true, 'deployments/{{inputs.parameters.deployment-name}}']
+
+  - name: patch-service
+    container:
+      image: argoproj/argoexec:v2.1.1
+      command: [sh, -c, -x]
+      args:
+      - kubectl get -n default service {{workflow.parameters.service-name}} --export -o json > /tmp/original-svc &&
+        jq '.spec.selector = (.spec.selector | with_entries(.value+="-blue"))' /tmp/original-svc > /tmp/blue-svc &&
+        kubectl apply -o yaml -f /tmp/blue-svc
+
+  - name: delete-deployment
+    resource:
+      action: delete
+      manifest: |
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: {{workflow.parameters.deployment-name}}-blue
+
+  - name: approve
+    container:
+      image: argoproj/argoexec:v2.1.1
+      command: [sleep, "30"]