ragul28

Docker Cleanup Commands

• images cleanup

docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

• image cleanup based on name

docker rmi $(docker images | grep "asia.gcr.io" | awk '{print $3}')

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Export running or paused Container:

• Export

docker export <dockernameortag> | gzip > mycontainer.tgz

• Load

gunzip -c mycontainer.tgz | docker load

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Kube Ingress with Cert-Manager

• install helm2

kubectl create clusterrolebinding cluster-admin-binding \
  --clusterrole cluster-admin \
  --user $(gcloud config get-value account)

kubectl create serviceaccount --namespace kube-system tiller

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• Scaling k8s daemonset down to zero

kubectl -n kube-system patch daemonset myDaemonset -p '{"spec": {"template": {"spec": {"nodeSelector": {"non-existing": "true"}}}}}'

• Scaling up k8s daemonset

kubectl -n kube-system patch daemonset myDaemonset --type json -p='[{"op": "remove", "path": "/spec/template/spec/nodeSelector/non-existing"}]'

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• kube current cluster info

kubectl config current-context
kubectl cluster-info
kubectl get events

• kube top

kubectl top pod --all-namespaces

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• kube current cluster info

kubectl config current-context
kubectl cluster-info
kubectl get events

• kube top

kubectl top pod --all-namespaces

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Easy Installation docker

• Init installtion & add user to docker group (not recommanded for prod usage)

curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh get-docker.sh
sudo usermod -aG docker $USER

• Sanity check

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version: '3'
services:
  elasticsearch:
    #image: elasticsearch:5-alpine
    image: elasticsearch:latest
    environment:
      - discovery.type=single-node
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms256m -Xmx256m"
    ulimits:

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version: '3'
services:
  vault:
    image: vault:latest
    container_name: vault-dev
    ports:
      - "8200:8200"
    restart: always
    environment:
      VAULT_ADDR: http://127.0.0.1:8200

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version: '3'
services:
 rabbitmq:
  image: rabbitmq:3-management
  container_name: rabbitmq
  hostname: rabbitmq
  restart: always
  ports:
   - "15672:15672"
   - "5672:5672"