Set Up
The installation, configuration and some tips about Docker.
Docker Installation on Raspberry Pi 4 / RaspberryPi OS
The Docker installation is pretty straighforward, just follow the official tutorial on docker.com.
Adding the repository
Firstly, you need to add the repository of the Docker Engine:
# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc
# Add the repository to Apt sources:
echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
$(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update
Installing the packages
Then, you can finally install the packages themselves with:
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
Testing your installation
And lastely, to make sure your installation is flawless, run the hello-world test container using the following command:
sudo docker run hello-world
Docker Commands to Remember
This article is a list of some Docker commands you should keep in mind.
1. docker exec
docker exec
- Description: execute a command in a running container
- Usage:
docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
Description
The docker exec
command runs a new command in a running container.
Options
-d
,--detach
: detached mode (run command in the background)-i
,--interactive
: keep STDIN open even if not attached-t
,--tty
: allocate a pseudo-TTY-u
,--user
: username or UID
Examples
- Execute an interactive
sh
shell inside mycontainer :docker exec -it mycontainer sh
- Execute an interactive
sh
shell inside mycontainer with the root user:docker exec -it --user root mycontainer sh