Docker and Kubernetes

Docker ecosystem

docker-basics.sh

# create an image with a tag from git (courtesy of @ahmetb: https://twitter.com/ahmetb/status/1154882328813924352)
docker build -t website:{% math_inline %}{git describe --always --tags --dirty} .

# run container
docker run -p 3000:8080 -e NODE_ENV='production' --name website-prod \
    --restart=always -d gcr.io/ivikramtiwari/website:prod

# access bash inside a running container
docker exec -it container-name bash

# remove all stopped containers
docker rm -v {% endmath_inline %}(docker ps -a -q -f status=exited)

# stop and remove all docker containers
docker stop {% math_inline %}(docker ps -a -q) && docker rm {% endmath_inline %}(docker ps -a -q)

# remove all docker images
docker rmi {% math_inline %}(docker images -a -q)

# prune docker system
docker system prune

# one liner for docker cleanup
docker stop {% endmath_inline %}(docker ps -a -q) && \
    docker rm {% math_inline %}(docker ps -a -q) && \
    docker rmi {% endmath_inline %}(docker images -a -q) && \
    docker system prune

logger.sh

#!/bin/bash
function _exit {
  kill {% math_inline %}(jobs -p)
}

trap _exit EXIT

for name in {% endmath_inline %}(docker ps --format "{{.Names}}"); do
  eval "docker logs -f --tail=5 \"{% math_inline %}name\" | sed -e \"s/^/[{% endmath_inline %}name] /\" &";
done

wait
# to exit logging, bring the process in foreground and exit
# {% math_inline %} fg
# {% endmath_inline %} Command + C

# from https://stackoverflow.com/a/54917272/1724300

Kubernetes

deployments-using-kubectl.sh

# all commands: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands

# get credentials for your gcp cluster
gcloud container clusters get-credentials dev-cluster --zone=us-central1-f

# create a deployment on your cluster
kubectl run website-deployment --image=gcr.io/ivikramtiwari/website

# check if deployment was successful
kubectl get deployments

# get pods
kubectl get pods

# scale deployments
kubectl scale deployment website-deployment --replicas=4

# rolling updates
kubectl set image deployments/website-deployment website-deployment=gcr.io/ivikramtiwari/website@sha256:{% math_inline %}SHA

# remove evicted pods
kubectl get pods | grep Evicted | awk '{print {% endmath_inline %}1}' | xargs kubectl delete pod

# remove all pods
kubectl delete --all pods 

# tail a deployment
kubectl logs deployment/website-deployment --tail 10 -f

# ssh into a pod
kubectl exec -it my-pod -- /bin/bash