🐯 👩‍❤️‍👩 ◾️ Canary Deployment to Kubernetes # 1: Gitlab CI 📚 👩‍👦‍👦 👤

We will be using Gitlab CI and manual GitOps to implement and use Canary deployments in Kubernetes.

Articles from this cycle:

(this article)
Canary Deployment with ArgoCI
Canary Deployment with Istio
Canary Deployment with Jenkins-X, Istio and Flagger

Canary- GitOps / Kubernetes. , Kubernetes Canary , , .

https://www.norberteder.com/canary-deployment/

Canary Deployment

Canary- . , , .

Kubernetes Deployment (rolling update)

Kubernetes Deployment — rolling-update, . , , .

GitOps

GitOps , :

Git
Git Operations ( , git tag/merge )

— .

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-docker

before_script:
   - printenv
   - kubectl version

stages:
 - deploy

deploy 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: app
 name: app
spec:
 ports:
 - port: 80
   protocol: TCP
   targetPort: 5000
 selector:
   id: app
 type: LoadBalancer

deployment deploy.yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
 name: app
spec:
 replicas: 10
 selector:
   matchLabels:
     id: app
     type: main
 template:
   metadata:
     labels:
       id: app
       type: main
   spec:
     containers:
     - image: registry.gitlab.com/wuestkamp/k8s-deployment-example-app:v1
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 100Mi

deployment deploy-canary.yaml:

kind: Deployment
metadata:
 name: app-canary
spec:
 replicas: 0
 selector:
   matchLabels:
     id: app
     type: canary
 template:
   metadata:
     labels:
       id: app
       type: canary
   spec:
     containers:
     - image: registry.gitlab.com/wuestkamp/k8s-deployment-example-app:v2
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 100Mi

, app-deploy .

deployment GitlabCI -. kubectl :

app deployment c 10 app-canary 0. LoadBalancer curl External IP:

while true; do curl -s 35.198.149.232 | grep label; sleep 0.1; done

, “v1”.

Canary

1:

1 deploy-canary.yaml :

kind: Deployment
metadata:
 name: app-canary
spec:
 replicas: 1
 selector:
   matchLabels:
     id: app
     type: canary
 template:
   metadata:
     labels:
       id: app
       type: canary
   spec:
     containers:
     - image: registry.gitlab.com/wuestkamp/k8s-deployment-example-app:v2
       name: app
       resources:
         limits:
           cpu: 100m
           memory: 100Mi

deploy.yaml 9:

kind: Deployment
metadata:
 name: app
spec:
 replicas: 9
 selector:
   matchLabels:
     id: app
...

, ( GitlabCI) :

Service , app. - Kubernetes ~ 10% :

(GitOps, Git Single Source Of Truth) deployments c , .

~10% . .

2:

, . deploy.yaml , 10. deploy-canary.yaml 0. :

k8s. Kubernetes API, .

, — (LoadBalancer Ingress), . .

, , .

Canary Deployment to Kubernetes # 1: Gitlab CI