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-# This workflow performs a "blue-green" deployment, while preserving the original deployment object
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-# and name. It accomplishes this by temporarily redirecting traffic to a *clone* of the original
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-# deployment. Then after upgrading the original deployment to a later version, redirects traffic
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-# back to the original (now upgraded) deployment.
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-apiVersion: argoproj.io/v1alpha1
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-kind: Workflow
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-metadata:
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- generateName: k8s-bluegreen-
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- annotations:
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- argocd.argoproj.io/hook: Sync
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-spec:
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- entrypoint: k8s-bluegreen
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- arguments:
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- parameters:
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- - name: deployment-name
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- - name: service-name
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- - name: new-deployment-manifest
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- - name: new-service-manifest
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-
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- templates:
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- - name: k8s-bluegreen
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- steps:
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- # 1. Create a parallel Kubernetes deployment with tweaks to name and selectors
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- - - name: create-blue-deployment
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- template: clone-deployment
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-
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- # 2. Wait for parallel deployment to become ready
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- - - name: wait-for-blue-deployment
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- template: wait-deployment-ready
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- arguments:
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- parameters:
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- - name: deployment-name
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- value: '{{workflow.parameters.deployment-name}}-blue'
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-
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- # 3. Patch the named service to point to the parallel deployment app
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- - - name: switch-service-to-blue-deployment
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- template: patch-service
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-
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- # 4. Update the original deployment (receiving no traffic) with a new version
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- - - name: apply-green-deployment
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- template: apply-manifest
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- arguments:
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- parameters:
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- - name: manifest
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- value: '{{workflow.parameters.new-deployment-manifest}}'
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-
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- # 5. Wait for the original deployment, now updated, to become ready
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- - - name: wait-for-green-deployment
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- template: wait-deployment-ready
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- arguments:
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- parameters:
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- - name: deployment-name
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- value: '{{workflow.parameters.deployment-name}}'
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-
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- # dummy approval step for demo purposes. Sleeps for 30 seconds
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- - - name: approve
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- template: approve
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-
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- # 6. Patch the named service to point to the original, now updated app
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- - - name: switch-service-to-green-deployment
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- template: apply-manifest
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- arguments:
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- parameters:
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- - name: manifest
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- value: '{{workflow.parameters.new-service-manifest}}'
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-
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- # 7. Remove the cloned deployment (no longer receiving traffic)
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- - - name: delete-cloned-deployment
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- template: delete-deployment
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-
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-# end of steps
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-
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- # clone-deployment creates a "blue" clone of an existing deployment. The string -blue is appended to:
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- # - metadata.name
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- # - spec.selector.matchLabels
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- # - spec.template.metadata.labels
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- - name: clone-deployment
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- container:
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- image: argoproj/argoexec:v2.1.1
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- command: [sh, -c, -x]
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- args:
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- - kubectl get --export -o json deployment.apps/{{workflow.parameters.deployment-name}} > /original-deploy &&
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- jq -r '.metadata.name+="-blue" |
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- .spec.template.metadata.labels += (.spec.template.metadata.labels | to_entries | map(select(.key != "app.kubernetes.io/instance")) | map(.value+="-blue") | from_entries) |
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- .spec.selector.matchLabels += (.spec.selector.matchLabels | to_entries | map(select(.key != "app.kubernetes.io/instance")) | map(.value+="-blue") | from_entries)'
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- /original-deploy > /cloned-deploy &&
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- cat /cloned-deploy &&
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- kubectl apply -o yaml -f /cloned-deploy
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-
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- # apply-manifest takes a kubernetes manifest and carrys over the app-name label (if present)
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- # before running `kubectl apply`. The label is used by ArgoCD for monitoring.
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- - name: apply-manifest
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- inputs:
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- parameters:
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- - name: manifest
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- artifacts:
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- - name: manifest-file
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- path: /manifest
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- raw:
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- data: '{{inputs.parameters.manifest}}'
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- container:
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- image: argoproj/argoexec:v2.1.1
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- command: [sh, -c, -x]
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- args:
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- - cp /manifest /manifest-new &&
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- APP_NAME=$(kubectl get -f /manifest-new -o json | jq -r '.metadata.labels."app.kubernetes.io/instance"') &&
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- if [ "$APP_NAME" != "null" ]; then
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- jq -r --arg APP_NAME "$APP_NAME" '.metadata.labels."app.kubernetes.io/instance" = $APP_NAME' /manifest-new > /manifest-new.tmp &&
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- mv /manifest-new.tmp /manifest-new &&
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- if [ "$(jq -r .spec.template.metadata.labels /manifest-new)" != "null" ]; then
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- jq -r --arg APP_NAME "$APP_NAME" '.spec.template.metadata.labels."app.kubernetes.io/instance" = $APP_NAME' /manifest-new > /manifest-new.tmp &&
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- mv /manifest-new.tmp /manifest-new ;
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- fi ;
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- fi &&
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- cat /manifest-new &&
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- kubectl apply -f /manifest-new
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-
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- # wait-deployment-ready waits for a deployment to become fully deployed and ready, using the
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- # `kubectl rollout` command
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- - name: wait-deployment-ready
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- inputs:
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- parameters:
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- - name: deployment-name
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- container:
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- image: argoproj/argoexec:v2.1.1
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- command: [kubectl, rollout, status, --watch=true, 'deployments/{{inputs.parameters.deployment-name}}']
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-
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- # patch-service updates the service selector labels to point to the "blue" deployment
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- - name: patch-service
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- container:
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- image: argoproj/argoexec:v2.1.1
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- command: [sh, -c, -x]
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- args:
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- - kubectl get service {{workflow.parameters.service-name}} --export -o json > /original-svc &&
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- jq '.spec.selector = (.spec.selector | with_entries(.value+="-blue"))' /original-svc > /blue-svc &&
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- kubectl apply -o yaml -f /blue-svc
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-
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- - name: delete-deployment
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- resource:
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- action: delete
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- manifest: |
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- apiVersion: apps/v1
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- kind: Deployment
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- metadata:
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- name: {{workflow.parameters.deployment-name}}-blue
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-
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- - name: approve
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- container:
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- image: argoproj/argoexec:v2.1.1
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- command: [sleep, "30"]
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