Docker

What and Why?

• Docker is an open source virtualization technology that makes it easy to build, test and deploy applications.
• You can ship your applications in a container environment that houses everything your application need to run (configuration, code,…)

Abbreviate

• ps = process status: check running containers (with a for all)
• i = interactive: used in docker exec or docker run
• t = terminal: used in docker exec or docker run
• m = memory
• v or -volume: mount volume in/out containers
• -rm = remove: create temprarily a container (removed after exit)

Installation

P/S: On MacOS I recommend using Orbstack that is native MacOS and free for Personally uses. It’s really light, fast and simple way to use Linux Machines.

Troubleshooting

• Got permission denied while trying to connect to the Docker daemon socket
  • Create the docker group: sudo groupadd docker
  • Create the docker group: sudo usermod -aG docker ${USER}
  • Logout and login again Source:https://www.digitalocean.com/community/questions/how-to-fix-docker-got-permission-denied-while-trying-to-connect-to-the-docker-daemon-socket
• Another application changed your Desktop configurations
  • Create symlink for docker-credential-ecr-login: `sudo ln -sf /Applications/Docker.app/Contents/Resources/bin/docker-credential-ecr-login /usr/local/bin/docker-credential-ecr-login Source: https://github.com/docker/for-mac/issues/7109

Some usually commands

# list images on the host
docker images
# check image's info
docker inspect <image_id>
# where are images stored?
docker info
# normally: /var/lib/docker

# list running container
docker ps
docker ps -a # all (include stopped)
# check log
docker container logs <container_id>
# get ip address
docker inspect <container_id> | grep IPAddress

Others

# ram & cpu usages
docker stats
docker stats <container_name|container_id>

# get ip address
docker inspect <container_name|container_id> | grep IPAddress

Attach/Start/Stop

We can use sometimes interchangeable between <container_id> and <container_name>.

# start container
docker start <container_name|container_id>
# start and enter the container
docker start -d <container>

# stop container
docker stop <container_name|container_id>

# stop all container
docker stop ${docker ps -a -q}

# entering the running container (no attach)
docker exec -it <container_name|container_id> /bin/bash