Add blue green deployment example app
This commit is contained in:
Jesse Suen
parent
852d97d96e
commit
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/lib
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/.ksonnet/registries
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/app.override.yaml
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/.ks_environment
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apiVersion: 0.1.0
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environments:
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default:
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destination:
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namespace: default
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server: https://kubernetes.default.svc
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k8sVersion: v1.10.0
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path: default
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kind: ksonnet.io/app
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name: blue-green-deploy
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version: 0.0.1
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workflows:
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- name: blue-green
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path: workflows/bluegreen.yaml
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local env = std.extVar("__ksonnet/environments");
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local params = std.extVar("__ksonnet/params").components["bg-deploy"];
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[
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{
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"apiVersion": "v1",
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"kind": "Service",
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"metadata": {
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"name": params.name,
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"annotations": {
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"argocd.argoproj.io/workflow-sync": "blue-green",
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"argocd.argoproj.io/workflow-param.blue-green.service-name": params.name,
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"argocd.argoproj.io/workflow-param.blue-green.new-service-manifest": "{{manifest}}",
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},
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},
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"spec": {
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"ports": [
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{
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"port": params.servicePort,
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"targetPort": params.containerPort
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}
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],
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"selector": {
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"app": params.name
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},
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"type": params.type
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}
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},
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{
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"apiVersion": "apps/v1beta2",
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"kind": "Deployment",
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"metadata": {
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"name": params.name,
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"annotations": {
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"argocd.argoproj.io/workflow-sync": "blue-green",
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"argocd.argoproj.io/workflow-param.blue-green.deployment-name": params.name,
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"argocd.argoproj.io/workflow-param.blue-green.new-deployment-manifest": "{{manifest}}",
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},
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},
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"spec": {
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"replicas": params.replicas,
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"selector": {
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"matchLabels": {
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"app": params.name
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},
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},
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"template": {
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"metadata": {
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"labels": {
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"app": params.name
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}
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},
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"spec": {
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"containers": [
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{
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"image": params.image,
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"name": params.name,
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"ports": [
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{
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"containerPort": params.containerPort
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}
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]
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}
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]
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}
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}
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}
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}
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]
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{
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global: {
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// User-defined global parameters; accessible to all component and environments, Ex:
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// replicas: 4,
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},
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components: {
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// Component-level parameters, defined initially from 'ks prototype use ...'
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// Each object below should correspond to a component in the components/ directory
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"bg-deploy": {
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containerPort: 80,
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image: "gcr.io/heptio-images/ks-guestbook-demo:0.1",
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name: "bg-deploy",
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replicas: 3,
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servicePort: 80,
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type: "LoadBalancer",
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},
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},
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}
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local components = std.extVar("__ksonnet/components");
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components + {
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// Insert user-specified overrides here.
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}
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{
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}
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local base = import "base.libsonnet";
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// uncomment if you reference ksonnet-lib
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// local k = import "k.libsonnet";
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base + {
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// Insert user-specified overrides here. For example if a component is named \"nginx-deployment\", you might have something like:\n")
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// "nginx-deployment"+: k.deployment.mixin.metadata.labels({foo: "bar"})
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}
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local params = std.extVar("__ksonnet/params");
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local globals = import "globals.libsonnet";
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local envParams = params + {
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components +: {
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// Insert component parameter overrides here. Ex:
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// guestbook +: {
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// name: "guestbook-dev",
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// replicas: params.global.replicas,
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// },
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},
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};
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{
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components: {
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[x]: envParams.components[x] + globals, for x in std.objectFields(envParams.components)
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},
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}
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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, transfering 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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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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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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# 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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# 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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# 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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# 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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# 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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# 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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# 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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# end of steps
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# clone deployment creates a "blue" clone of an existing deployment.
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# -blue is appended to the metadata.name, as well as the values in the spec.selector.matchLabels,
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# and 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}} > /tmp/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 != "applications.argoproj.io/app-name")) | map(.value+="-blue") | from_entries) |
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.spec.selector.matchLabels += (.spec.selector.matchLabels | to_entries | map(select(.key != "applications.argoproj.io/app-name")) | map(.value+="-blue") | from_entries)'
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/tmp/original-deploy > /tmp/cloned-deploy &&
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cat /tmp/cloned-deploy &&
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kubectl apply -o yaml -f /tmp/cloned-deploy
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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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resource:
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action: apply
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manifest: '{{inputs.parameters.manifest}}'
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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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- 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 -n default service {{workflow.parameters.service-name}} --export -o json > /tmp/original-svc &&
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jq '.spec.selector = (.spec.selector | with_entries(.value+="-blue"))' /tmp/original-svc > /tmp/blue-svc &&
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kubectl apply -o yaml -f /tmp/blue-svc
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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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- 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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