Migrating the Red Pill

In this exercise, you will learn how to migrate the Caddy and Javalin configurations from the caddy_deployment folder to the 2semDockerSetupRemote folder. This will allow you to keep all the Docker configurations in one compose file and simplify the deployment process.

Prerequisites at this point

1. You should have a Docker Compose file in the 2semDockerSetupRemote folder on your Droplet with the Postgres database and the hotelAPI services.

2. You have a caddy_deployment folder that configures the Caddy server to serve the Javalin application over HTTPS. And you will probably also have one or more Javalin applications running in Docker containers from 2nd semester.

The Plan

To make things easier to manage, we will begin by shutting down the Caddy and Javalin services by running:

cd ~jetty/caddy_deployment
docker compose down

We will then move the Caddy and Javalin configurations from the caddy_deployment folder to the 2semDockerSetupRemote folder. This will allow us to keep all the Docker configurations in one compose file and simplify the deployment process.

There are three steps to this process:

1. Copy the content of the Caddyfile in the caddy_deployment folder to the corresponding Caddyfile in the 2semDockerSetupRemote folder.
2. Copy the site folder from the caddy_deployment folder to the 2semDockerSetupRemote folder. The site folder contains the static files for the Caddy server. This folder will be used to deploy frontend applications later in the semester.
3. Copy the Javalin applications folders from the caddy_deployment folder to the 2semDockerSetupRemote folder. Like “Fog carport”, “Cupcake”, “Fourthingsplus” etc.
4. Finally, copy the Javalin services from the docker-compose.yml file in the caddy_deployment folder to the corresponding docker-compose.yml file in the 2semDockerSetupRemote folder.

The Commands

Step 1: Copy the Caddyfile

1. Navigate to the caddy_deployment folder on your Droplet.

2. Print out the content of the Caddyfile:

    cat Caddyfile
   

3. Copy the content of the Caddyfile to the clipboard.
4. Navigate to the 2semDockerSetupRemote folder.

5. Open the Caddyfile in an editor (nano):

    nano Caddyfile
   

6. Paste the content of the Caddyfile into the editor.
7. Save the file and exit the editor.

Step 2: Copy the site folder

1. Navigate to the caddy_deployment folder on your Droplet.

2. Copy the site folder to the 2semDockerSetupRemote folder:

    cp -r site ../2semDockerSetupRemote
   

Step 3: Copy the Javalin applications folders

1. Navigate to the caddy_deployment folder on your Droplet.

2. Copy the Javalin applications folders to the 2semDockerSetupRemote folder:

    cp -r fog ../2semDockerSetupRemote
    cp -r cupcake ../2semDockerSetupRemote
    cp -r fourthingsplus ../2semDockerSetupRemote
   

3. Repeat this step for all the Javalin applications you have running in Docker containers.

Step 4: Copy the Javalin services

1. Navigate to the caddy_deployment folder on your Droplet.

2. Open the docker-compose.yml file in an editor (nano):

    nano docker-compose.yml
   

3. Copy the Javalin services from the docker-compose.yml file to the clipboard.
4. Navigate to the 2semDockerSetupRemote folder.

5. Open the docker-compose.yml file in an editor (nano):

    nano docker-compose.yml
   

6. Paste the content of the Javalin services into the editor.
7. Save the file and exit the editor.

The Result

You should now have all the Caddy and Javalin configurations in the 2semDockerSetupRemote folder. You can now start the services with Docker Compose:

cd ~jetty/2semDockerSetupRemote
docker compose up -d

You should now be able to access the Javalin applications through the Caddy server over HTTPS.

You will also be able to deploy frontend applications in the site folder later in the semester.