docker-cheatsheet.sh

# BEST PRACTICES
# https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#exclude-with-dockerignore


# docker commands I use on a daily basis

docker run -d --rm   --name myRedis  -p 6379:6379/tcp   redis

# interactive mode
docker run -it [IMAGE] 

# attach to an existing container
docker exec -it <container name> /bin/bash

# START A CONTAINER
docker container start <container name>

# build an image  (from a different context / Docker file) and tag the image 
docker build -t pipeline:v1 -f docker/base-image/Dockerfile  .

# REMOVE DANGLING IMAGES 
docker rmi $(docker images --filter "dangling=true" -q --no-trunc)

# CLEAN dangling images/containers
docker system prune

# DOCKER TAG
docker image tag rhel-httpd:latest registry-host:5000/myadmin/rhel-httpd:latest

# DOCKER PUSH
docker image push registry-host:5000/myadmin/rhel-httpd:latest

# TRUNCATE ALL LOGS
truncate -s 0 /var/lib/docker/containers/*/*-json.log


# ====================================
# DOCKER VOLUME - for data persistance
# ====================================
docker volume help
docker volume create redis01
docker volume inspect redis01

# run container using volume:
docker run -d --rm   --name myRedis     -v redis01:/data    -p 6379:6379/tcp   redis:alpine



# ====================================
# DOCKER COMPOSE 
# ====================================
# https://docs.docker.com/compose/compose-file/

# BUILD
docker-compose -p pipe   --env-file ./docker/.env.dev    build
docker-compose -p pipe   --env-file ./docker/.env.dev    build     -f docker/docker-compose.yml

# UP 
docker-compose -p pipe --env-file ./docker/.env.dev    up  -d

# PS
docker-compose -p pipe --env-file ./docker/.env.dev    ps

# attach to an existing service
docker-compose -p pipe --env-file ./docker/.env.dev   exec  serviceName   bash

# SCALE a service 
docker-compose -p pipe --env-file ./docker/.env.dev   up --scale app=2
docker-compose   scale web=2 worker=3


# ====================================
# MEMORY
# ====================================
# mem = m|g 
docker run -it --memory="[memory_limit]" [docker_image]
docker run -it --memory="1g" ubuntu
sudo docker run -it --memory="1g" --memory-swap="2g" ubuntu
# if you don't want to use swap, set the same value for swap as for the memory
# --memory-reservation="750m"  this is a soft limit and should be less than the --memory hard limit


# ====================================
# CPU
# ====================================
# give access to one cpu
docker run -it --cpus="1.0" ubuntu

# specify cycles (default = 1024)
docker run -it --cpus-shares="700" ubuntu