Docker Compose

What is Docker compose?

It's a way to automate the docker run ... commands. YOu can write everything needed in a file called docker-compose.yaml and with a single command the containers.
You can add multiple containers to a single docker-compose.yaml and they all can be started/stopped together
no need to remember long and complex docker run ... commands

Installing Docker Compose

docker-compose can be installed with apt
```
$ sudo apt install docker-compose
```
a new command called docker-compose should be available

In newer versions of Docker, this step is not needed as docker compose is available with the docker installation. Debian smh.

To use docker-compose, we need to write a new file called docker-compose.yaml for our app
Go to the figlet-web repo we cloned earlier and open you favorite text editor
```
$ cd -
$ cd figlet-web
$ nano docker-compose.yaml
```

Add these lines

version: "3"
services:
  figlet_web:
  image: figlet-web:latest
  build: .
  ports:
   - 8081:8080

Build the image using docker-compose
```
$ docker-compose build
```
Start the container
```
$ docker-compose up
```
use docker-compose up -d if you want to continue using the terminal, or don't want the app to stop if you press Ctr+C. -d stands for detach. it tells docker compose to detach from the terminal and run in the background once the app has started.
Now the app should be running and should be accessible from the browser. goto http://HOSTNAME_IN_CHIT.i10e.xyz:8081 to see it.
Again, we need to remove the :8081 at the end.
Update the Caddyfile, /etc/caddy/Caddyfile so it knows we want to see the new docker compose app instead.
```
figlet-web-docker.HOSTNAME_IN_CHIT.i10e.xyz {
-  reverse_proxy :8080
+  reverse_proxy :8081
}
```
and reload Caddy with sudo systemctl reload caddy.service
Enjoy your app at https://figlet-web-docker.HOSTNAME_IN_CHIT.i10e.xyz
Stopping the container
```
$ docker-compose down
```