Docker is a set of platform as a service (PAAS) products that use OS-level virtualization to deliver software in packages called containers.
Dependencies
Update the system
sudo apt update
Docker Install
Install docker
sudo apt install docker.io
To check whether docker has installed correctly, run the following command
sudo docker -v
`Docker version 20.10.12, build 20.10.12-0ubuntu2~20.04.1
To run docker containers the docker run
command is used
docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:6a65f928fb91fcfbc963f7aa6d57c8eeb426ad9a20c7ee045538ef34847f44f1
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
Docker Compose Install
Install docker-compose
sudo apt install docker-compose
Setting up a docker-compose.yml
file
mkdir example
cd example
touch docker-compose.yml
nano docker-compose.yml
Below is the docker compose file for setting up nginx proxy manager as an example.
version: '3'
services:
app:
image: 'jc21/nginx-proxy-manager:latest'
restart: unless-stopped
ports:
- '80:80'
- '81:81'
- '443:443'
volumes:
- ./data:/data
- ./letsencrypt:/etc/letsencrypt
To run the docker-compose.yml file and make it into a container, the follwing command can be run:
docker-compose up -d
The `–force-create flag can be added to remake the container
docker-compose up -d --force-create
To check the status of containers docker ps
can be run.