Kubernetes

kube_basics.md

Cluster info

• display information about cluster
  • kubectl cluster-info
• connect to cluster
  • aws eks update-kubeconfig --name [cluster_name] --region eu-west-1
  • fix for permissions: open iam and add eks access
• multiple contexts
  • kubectl config use-context [context]
• pods
  • kubectl get pods
• aws credentials C:\Users\ USERNAME . aws\credentials

[default]
aws_access_key_id = 
aws_secret_access_key = 

[github]
aws_access_key_id = 
aws_secret_access_key = 

• aws auth

apiVersion: v1
kind: ConfigMap
metadata:
  name: aws-auth
  namespace: kube-system
data:
  mapUsers: |
    - userarn: [USER-ARN]
      username: github-ci
      groups:
        - system:masters

• kubectl apply -f eks/aws-auth.yml

kubectl commands

• kubectl get service
• kubectl get pods
• kubectl apply -f eks/deployment.yml
• kubectl apply -f eks/service.yml
• kubectl apply -f eks/ingress.yml

k9s

• :ns [enter] (namespace)
• :service [enter]
• :pods [enter]
• :cj [enter] (cronjobs)
• :configmap [enter]
• d (describe on aws-auth)
• :quit [enter] (exit k9s)

deploy image to cluster

apiVersion: apps/v1
kind: Deployment
metadata:
  name: [OBJECT_NAME]
  labels:
    app: [APP_NAME]
spec:
  replicas: 1 (number of pods)
  selector:
    matchLabels:
      app: [APP_NAME]
  template:
    metadata:
      labels:
        app: [APP_NAME]
    spec:
      containers:
      - name: [APP_NAME]
        image: [URI_IMAGE]
        ports:
        - containerPort: 8080 (same as in dockerfile?)

• deploy

  • kubectl apply -f eks/deployment.yml

• check errors

  • kubectl logs -f [POD_NAME]

• service

apiVersion: v1
kind: Service
metadata:
  name: me-warehouse-api-service
spec:
  selector:
    app: me-warehouse-api
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: LoadBalancer

• deploy service

  • kubectl apply -f eks/service.yml

• kubectl latest

  • https://storage.googleapis.com/kubernetes-release/release/stable.txt

kube_ingress.md

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