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Hosting.md

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Notes on what we did

In order to HOST the final projects of 9.1, we created a AWS instance to run them all and give them last minute experience with Docker. Maybe we should Kubernetes next time? (Or both?)

Setup

  • Created a 4-cpu, 16GB memory, Lightsail instance.
  • Tied it to a static IPv4 address.
  • Setup to allow firewall to let in 80 and 443.
  • Used/Installed caddy as a reverse-proxy web server for the student projects.
    • it's very simple to set up
  • Installed docker to support the projects
  • I had to install nd compile the latest golang to get caddy to compile.
    • There is no binary image of caddy for Amazon Linux (which what I installed when creating instance)

Caddyfile for the reverse-proxy

This file mapped the names like project1name.zipcode.rocks to localhost:8086. Several groups had to sanitize their code because they had CORS problems (needed to fix a CORS pattern). Several groups had to sanitize source to remove localhost:8080 references, after we assigned a new project port.

Had to caddy run in the directory where the Caddyfile was.

/etc/caddy/Caddyfile

{
	debug
	log {
		output file /var/log/access.log
	}
}

xo.zipcode.rocks {
	root * /home/ec2-user/zcw

	file_server {
		index index.html
	}
}

pp.zipcode.rocks paperplane.zipcode.rocks {
        reverse_proxy localhost:8086
}
klasschat.zipcode.rocks {
        reverse_proxy localhost:8087
}
newscraft.zipcode.rocks {
        reverse_proxy localhost:8088
}
duryou.zipcode.rocks {
        reverse_proxy localhost:8089
}
zipflix.zipcode.rocks {
        reverse_proxy localhost:8090
}

Changes to DNS for xo.zipcode.rocks

We made a A record for each project. Created a project-name.zipcode.rocks record that pointed to the host's IPv4 address. CNAMEs wouldn't work. One for each project.

    A	xo	18.221.94.201
# and then for each project
	A	paperplane	18.221.94.201
    ...

(18.221.94.201 was the IPv4 static address of the instance.)

Each project's PORT assignments

Each team had a reverse-proxy port assigned. We used [8086, 8087, 8088, 8089, 8090]. This allowed us to map the internal ports to the names we put into the .zipcode.rocks domain.

We also assigned special ports for the DATABASES. With docker, you cannot have two MySQLs both running on default port 3306. So we assigned all the MySQL and Postgres servers a different port so they wouldn't collide. All the student's projects had to change the PORT for the DB everywhere in their project source. (Not just the ports in the app.yml files in the jhipster projects. This was counter-intuitive, but app.yml was not enough.)

Student-Group access

Used standard PEM file to grant students access using a simple shell script.

Distributed a TGZ of the shell script xo and it's associated .PEM private key file.

Students need to place PEM file into their .ssh/ folder, making sure that the chmod is 0400. Then, place the xo file into ~/bin making sure that ~/bin is on the shell PATH...

export PATH=$HOME/bin:$PATH

Before first deployment

Each group had to get their project running on a DEV machine on their assigned PORT(s) within a DEV based docker container.

Each time they make GIT changes...

git pull

npm run java:docker

docker-compose -f src/main/docker/app.yml up

The NPM command did a build and created the jar. The docker-compose did the launch of the tasks needed for the project.

As of September 2023