Docker commands

docker-commands.md

Container's IP Address

• docker inspect CONTAINER-ID | grep IPAddress

Container IP address using docker-compose

• docker-compose ip

Stop and remove all container

• docker stop $(docker ps -a -q)
• docker rm $(docker ps -a -q)

Remove all images

• docker rmi $(docker images -q)

Run bash terminal

• docker-compose run web bash

OR

• docker exec -it CONTAINER-ID /bin/bash

The -t option opens up a terminal, and the -i option makes it interactive. The /bin/bash options opens a bash shell to the running container.

Stops containers and removes containers, networks, volumes, and images created by up.

• docker-compose down [options]
• https://docs.docker.com/compose/reference/down/

Run postgresql container and use psql

• run --name db -d -e POSTGRES_PASSWORD=docker -e POSTGRES_USER=docker postgres
• docker exec -it db psql -U docker postgres # postgres is optional

Debugging Rails with pry within a Docker container

1. docker-compose up -d && docker attach web

Details can be found here.

2. docker-compose run --service-ports web

docker-compose run creates a TTY session for your app to connect to, allowing interactive debugging. The default docker-compose up command does not create a TTY session.

Use docker without sudo in ubuntu

http://askubuntu.com/questions/477551/how-can-i-use-docker-without-sudo

Restore database dump (.dump file) in docker db container

1. Enter db container

docker exec -it db /bin/bash

2. Create database using psql

psql -U postgres create database DATABASE_NAME;

3. Copy dump to db container

docker cp DB_DUMP.dump $(docker-compose ps -q db):/

4. Restore dump using pg_restore

pg_restore -U postgres --no-owner -d DATABASE_NAME < DB_DUMP.dump

Official doc for using docker without sudo in ubuntu:
https://docs.docker.com/engine/installation/linux/linux-postinstall/

Links to install docker(CE) and docker-compose:

Docker Community Edition (CE)

Docker Compose

Compressed Backup:

Backup:
pg_dump -h localhost -p 5432 -U postgres -d mydb | gzip > backup.gz

Restore:
gunzip -c backup.gz | psql -h localhost -p 5432 -U postgres -d mydb

Kill server running on some port number

$ lsof -wni tcp:
Then, use the number in the PID column to kill the process:

$ kill -9 PID

Some useful info: https://www.freecodecamp.org/news/dockers-detached-mode-for-beginners-c53095193ee9/