▶️ 👩🏿‍🏭 🙎🏽 Canary Deployment to Kubernetes # 2: Argo Rollouts 👶🏽 🖲️ 🚁

We will use the k8s native Argo Rollouts deployment controller and GitlabCI to run Canary deployments on Kubernetes.

https://unsplash.com/photos/V41PulGL1z0

Articles in this cycle

Canary Deployment

, , Canary Deployments. Kubernetes.

Argo Rollouts

Argo Rollouts — Kubernetes- . CRD (Custom Resource Definition) Kubernetes. , : Rollout, blue-green anary deployments .

Argo Rollouts, Rollout, , blue-green anary Kubernetes. Rollout Deployment, .

Deployments : RollingUpdate Recreate. , , , blue-green canary, Deployment . Kubernetes, Deployments. Argo Rollouts .

https://argoproj.github.io/argo-rollouts

Argo CI, - Rollouts, .

Argo Rollouts

kubectl create namespace argo-rolloutskubectl apply -n argo-rollouts -f https://raw.githubusercontent.com/argoproj/argo-rollouts/stable/manifests/install.yaml

(. ) install.yaml i/k8s/argo-rollouts/install.yaml. GitlabCI .

(kubectl plugin)

https://argoproj.github.io/argo-rollouts/features/kubectl-plugin

Kim Wuestkamp / k8s-deployment-example-app

API Python+Flask, JSON. , GitlabCI Gitlab Registry. :

wuestkamp/k8s-deployment-example-app:v1
wuestkamp/k8s-deployment-example-app:v2

JSON-. , .

GitlabCI Kubernetes, .gitlab-ci.yml :

image: traherom/kustomize-dockerbefore_script:
   - printenv
   - kubectl versionstages:
 - deploydeploy test:
   stage: deploy
   before_script:
     - echo $KUBECONFIG
   script:
     - kubectl get all
     - kubectl apply -f i/k8s    only:
     - master

, Gcloud:

gcloud container clusters create canary --num-nodes 3 --zone europe-west3-b
gcloud compute firewall-rules create incoming-80 --allow tcp:80

https://gitlab.com/wuestkamp/k8s-deployment-example-canary-infrastructure KUBECONFIG GitlabCI, kubectl .

, (Gcloud).

Yaml

service:

apiVersion: v1
kind: Service
metadata:
 labels:
   id: rollout-canary
 name: app
spec:
 ports:
 - port: 80
   protocol: TCP
   targetPort: 5000
 selector:
   id: app
 type: LoadBalancer

rollout.yaml :

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
 name: rollout-canary
spec:
 replicas: 10
 revisionHistoryLimit: 2
 selector:
   matchLabels:
     id: rollout-canary
 template:
   metadata:
     labels:
       id: rollout-canary
   spec:
     containers:
     - name: rollouts-demo
       image: registry.gitlab.com/wuestkamp/k8s-deployment-example-app:v1
       imagePullPolicy: Always
 strategy:
   canary:
     steps:
     - setWeight: 10
     # Rollouts can be manually resumed by running `kubectl argo rollouts promote ROLLOUT`
     - pause: {}
     - setWeight: 50
     - pause: { duration: 120 } # two minutes

Rollout Deployment. ( canary ) rolling-update Deployment.

yaml canary deployment:

10% canary (wait for manual OK)
50% canary (wait 2 minutes then continue to 100%)

Canary Deployment

1: 10%

canary , , :

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
 name: rollout-canary
spec:
...
 template:
   metadata:
     labels:
       id: rollout-canary
   spec:
     containers:
     - name: rollouts-demo
       image: registry.gitlab.com/wuestkamp/k8s-deployment-example-app:v2
...