Docker & Docker Compose
Docker
Build image
sudo docker build -t imgName /path/to/dockerfile/dir
Commonly used options
| Option | Description |
|---|---|
| -e VAR=value | Set environment variable. |
| --expose portNum | Expose a container port. |
| -i | Interactive (for shells). |
| -network="host" | Use host network interfaces. |
| -p hostPort:containerPort | Make a container port accessible from a host port. |
| -rm | Automatically remove the container when it exits. |
| -u uid:gid | Run container as the specified user. |
| -v /host/vol:/container/vol | Mount a host volume in the container. |
| -v /target:/dest:Z | Grant selinux permission to host dir (target) and contents. |
Delete container
sudo docker rm containerId
Delete image
sudo docker rmi imageId
Edit file stored in container volume
Copy it to local machine (current directory) and make changes.
sudo docker cp containerName:/path/to/file.ext .
Move the edited file back to the volume.
sudo docker cp file.ext containerName:/path/to/file.ext
Get installed images
sudo docker images
Get running containers
sudo docker ps
tip
Append option --all to also see the stopped ones in the output.
Kill running container
sudo docker kill containerId
Manage Docker as non-root user
sudo groupadd docker
sudo usermod -aG docker $USER
Log out and log back in.
info
Run image
sudo docker run [OPTIONS] IMAGE [COMMAND] [COMMAND ARGS]
Start service the first time it is used instead of at boot
sudo systemctl enable docker.socket
Docker compose
Build images defined in yml file
sudo docker-compose build
tip
Option -f /path/to/yml can be used to specify the path to the definition file.
Build images then start services
sudo docker-compose up --build
Get info on running containers
sudo docker-compose ps
Open interactive shell in running container
sudo docker-compose exec -it serviceName bash
note
serviceNamehas to match the one indocker-compose.yml.- Other programs that require an interactive shell can be executed using the same syntax.
Start services in detached mode (bg process)
sudo docker-compose up -d
When using this mode output from containers can be seen by running:
sudo docker-compose logs
Start specific service only
sudo docker-compose up --no-start
sudo docker-compose start serviceName
Stop all running services
sudo docker-compose down