SSH + screen + RPi
Hello, long time no see!
Recently I had a situation in which I needed to have two processes running on a docker container, and this docker container was running on my RPi. So… I solved my situation using screen.
What is screen?
It is an awesome tool that allows us to have multiple terminals from a physical one. You can check more information here
How to install it?
Easy, just type this on your RPi:
sudo apt-get install screen
How to use it?
It is even easier! Here is a cheatsheet of the basic usage:
- To create a new session:
screen -s session-name. After this you will be on that new terminal. - To return to your original terminal: just hit
ctrl + a + d. - To list all your terminals type:
screen -ls - To connect to one of the terminal you created (on step 1), type: screen -r
session-name - When you are on a session, you can kill that one using
ctrl + k, this will ask you and you just have to hit “y” to kill that session
How do I use it?
Here is some context to my situation. I need to connect to my RPi, run a docker container, and run two processes on that docker container, here is what I do.
# connect to my rpi ssh [email protected] # run docker compose on the background docker-compose up -d # create a new session with screen, this will log me in into my new session screen -S beat # list docker containers running docker ps # connect the terminal on the docker image docker exec -it name-of-the-container bash # load some env vars source env_vars # start celery beat celery beat --app config.celery -l info # close beat session ctrl + a + d # create a new session with screen, this will log me in into my new session screen -S worker # list docker containers running docker ps # connect the terminal on the docker image docker exec -it name-of-the-container bash # load some env vars source env_vars # start celery worker celery worker --app config.celery -l info # close beat session ctrl + a + d
And that is, after this, celery beat and worker will be running on background.