Python Web app with Docker - if3-selfhosting-101

A Python web app with Docker

clone the figlet-web repository

$ cd -
$ git clone https://github.com/anandology/figlet-web

Writing a Dockerfile

$ cd figlet-web
$ nano Dockerfile

Dockerfile:

FROM python:3
WORKDIR /app
RUN apt update
RUN apt install figlet -y
COPY . .
RUN pip install -r requirements.txt
CMD [ "gunicorn", "--bind", "0.0.0.0:8080", "webapp:app" ]

Building the image

$ docker build . -t figlet-web

$ docker image ls
REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
figlet-web   latest    d0fbac841345   31 seconds ago   1.09GB
python       3         17e65561fd2c   11 days ago      1.02GB

Now that the image is built, it can be ran with docker run ...
```
$ docker run figlet-web
```
Now the app should be running and should be accessible from the browser. goto http://HOSTNAME_IN_CHIT.i10e.xyz:8080 to see it.
Not seeing anything? We need to ask docker to let us see what's on port 8080
use Ctrl+C to stop your the running container

-p <host port>:<container port> flag for the docker run ... command gives access to the <container port> from <host port> on the host.
```
$ docker run -p 8080:8080 figlet-web
```
use docker run ... -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 to detach from the terminal and run in the background once the container has started.
Try again by visiting http://HOSTNAME_IN_CHIT.i10e.xyz:8080
How to remove that ugly :8080 at the end? For that, we have to tell caddy to do its magic
Update the Caddyfile, /etc/caddy/Caddyfile so it knows where out docker python app is.
```
+figlet-web-docker.HOSTNAME_IN_CHIT.i10e.xyz {
+  reverse_proxy :8080
+}
```
and reload Caddy with sudo systemctl reload caddy.service
Enjoy your app at https://figlet-web-docker.HOSTNAME_IN_CHIT.i10e.xyz
How to see all my running containers? what if I want to stop one of them?
```
$ docker ps
```
To stop any of them, we need the container id show by docker ps
```
$ docker stop <container id>
```
If you're too lazy to look for and remember the gibberish id everytime, use docker run ... --name "cool_name" when starting the container. Now you can use cool_name instead of the id. Yay!