Docker

This will be also about project connected to or running on Docker, like Portainer.

Docker software

A container run an image.
Data are in /var/lib/docker/volumes/.

Install guide for Linux here. Don’t forget to add yourself to the docker group: usermod -a -G docker $USER

Container management

• Run docker run -d --name container_name image with image nginx for example
• Stop docker stop container_name
• Restart docker restart container_name
• Pause docker pause container_name and docker unpause container_name
• Kill docker kill container_name
• Remove docker rm container_name
• Bash/See what’s going on docker attach container_name
  • And CTRL+P then CTRL-Q to detach
• Update docker update [OPTIONS] CONTAINER
  • Add restart policy: docker update --restart=always CONTAINER

Images management

• List docker images
• Remove docker rmi image_name
• List of images are in the Docker Hub
• An previously downloaded image can be used by referring its image ID

Data management

• Browse data in volumes: /var/lib/docker/volumes/
• Transfer a file from/to a container docker cp CONTAINER:SRC_PATH DEST_PATH

Other commands

• Get Docker directory docker info
• List all containers docker ps -a
• Run a command in a container docker exec container_name command
• Do some spring cleanup - (Be careful with that!) docker system prune --all

Portainer - Web container management

Helps to manage containers.

• Run docker run --restart always -d -p 9000:9000 -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce
• Automatically remove old images: define the variable WATCHTOWER_CLEANUP=true
• Fix 0.0.0.0 IP in exposed port: change Public IP in Endpoints - Source

Watchtower - Automatic container update

Update containers automatically. Run the quick start script to install.

Environment variables:

• TZ:timezone: Timezone
• WATCHTOWER_SCHEDULE: 0 0 5 * * *: cron setting to check for update each day at 0500.

Chrony / Docker-NTP

Provide a NTP server.

• 123:UDP need to be exposed

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