Docker common commands

docker basic comands

# Basic Docker run
docker run \
  # Share file/directory
  -v ./bkp:/bakup
  # Remember... use ´touch .bash_history´ before share if file don't exists
  -v .bash_history:/root/.bash_history
  # Port to share (port in your pc:conatiner port)
  -p 3306:3306
  # Env Variables
  -e VARIABLE="variable_content"
  # Image from repository (without repository information, get from docker hub)
  IP-REGISTRY:5000/docker-image-name:latest

# Example with entrypoint overload
docker run --rm --entrypoint "/bin/ls" container_name

# List docker containers executing
docker ps

# List docker containers executing and stopped
docker ps -a

# List docker images
docker images

# List docker volumes
docker volumes

# Show HD use
docker system df

# Show modifications of image (with size)
docker history IMAGE_ID

# Execute command with interactive terminal
docker exec -it IMAGE_NAME COMMAND
ex: docker exec -it myapp ls -lah /app

# Go to Container bash
docker exec -it IMAGE_NAME bash
# or
docker exec -it IMAGE_NAME /bin/bash

# Show environment varibles to test
docker exec container bash -c 'echo "$ENV_VAR"'

# Remove everything unnused (CAUTION!!)
docker system prune
docker image prune --all

# Remove all stopped containers (CAUTION!!)
docker ps -a -q | xargs --no-run-if-empty docker rm

# Remove unnused images
docker images --quiet --filter=dangling=true | xargs --no-run-if-empty docker rmi

# Remove unnused volumes
docker volume ls -q -f dangling=true | xargs --no-run-if-empty docker volume rm

# IF you have HD problem, verify the dir
/var/lib/docker/devicemapper/

Docker example commands ARG&ENV

FROM amazonlinux:latest

ARG AURL="https://www.site.com.br/"
ENV URL=$URL

CMD echo $URL