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AdrianFarmadin/docker-training

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Run, Start, Stop...

$ docker ps
$ docker pull alpine
$ docker image ls
$ docker run alpine echo “hello from alpine”
$ docker run alpine ls -l
$ docker ps -a
$ docker start CONTAINER
$ docker container rm CONTAINER

Try another command.

$ docker run alpine /bin/sh

Not working? You need to attach an interactive tty in the container with the -it flags.

$ docker run -it alpine /bin/sh

Let's start something more interesting.

$ docker run --name mariadb -p 3306:3306 -e MYSQL_ROOT_PASSWORD=super-secret-pw -e MYSQL_DATABASE=todo -e MYSQL_USER=todo -e MYSQL_PASSWORD=todo --rm -d mariadb

Network

$ docker network create example
$ docker network connect --alias db example mariadb
$ docker run --rm -p 8080:8080 --network example adrianfarmadin/todo-jsf-example
$ docker run --network example -p 8090:8080 -d adminer

Inspect containers default aliases.

Volumes

Why volumes?

  • Selinux: chcon -Rt svirt_sandbox_file_t /my/own/datadir
  • Filesystem UserId/GroupId
$ docker volume create db-vol
$ docker volume ls
$ docker volume inspect db-vol

Use volume

$ docker run --name mariadb  --mount source=db-vol,target=/var/lib/mysql -e MYSQL_ROOT_PASSWORD=super-secret-pw -e MYSQL_DATABASE=todo -e MYSQL_USER=todo -e MYSQL_PASSWORD=todo --network example --net-alias db --rm -d mariadb

or

$ docker run --name mariadb  -v db-vol:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=super-secret-pw -e MYSQL_DATABASE=todo -e MYSQL_USER=todo -e MYSQL_PASSWORD=todo --network example --net-alias db --rm -d mariadb

Backup a container

$ docker run --rm --volumes-from mariadb -v $(pwd):/backup alpine tar cvf /backup/backup.tar -C /var/lib/mysql .

Restore container from backup

$ docker volume create db-vol2
$ docker run -v db-vol2:/dbdata -v $(pwd):/backup alpine sh -c "cd /dbdata && tar xvf /backup/backup.tar --strip 1"
$ docker run --name mariadb  -v db-vol2:/var/lib/mysql --network example --net-alias db --rm -d mariadb

Docker volumes are not deleted with container. You muss clean up yourself.

$ docker volume rm my-vol

Clean up

$ docker kill $(docker ps -q)
$ docker container prune
$ docker volume prune
$ docker network prune

or delete everything

$ docker system prune

Docker-compose

$ docker-compose up -d
$ docker-compose logs -f web
$ docker-compose down

Issues