xmulligan / the-hive

A virtual environment based upon play with Docker

The-Hive 🐝

We love docker and Kubernetes so much that we put docker in docker and kubernetes in that... if you want to go deeper, then feel free!

Requirements

• Docker 20.10.0+
• Go (stable release)

Development

# Clone this repo locally
git clone https://github.com/thebsdbox/the-hive
cd the-hive

# Verify the Docker daemon is running
docker run hello-world

# Load the IPVS kernel module. Because swarms are created in dind,
# the daemon won't load it automatically
sudo modprobe xt_ipvs

# Ensure the Docker daemon is running in swarm mode
docker swarm init

# Get the latest franela/dind image
docker pull thebsdbox/dind

# Start PWD as a container
docker-compose up

Now navigate to http://localhost and click the green "Start" button to create a new session, followed by "ADD NEW INSTANCE" to launch a new terminal instance.

Notes:

• If you want to override the DIND version or image then set the environmental variable i.e. DIND_IMAGE=thebsdbox/docker<version>-rc:dind. Take into account that you can't use standard dind images, only franela ones work.

Port forwarding

In order for port forwarding to work correctly in development you need to make *.localhost to resolve to 127.0.0.1. That way when you try to access pwd10-0-0-1-8080.host1.localhost, then you're forwarded correctly to your local PWD server.

You can achieve this by setting up a dnsmasq server (you can run it in a docker container also) and adding the following configuration:

address=/localhost/127.0.0.1

Don't forget to change your computer's default DNS to use the dnsmasq server to resolve.

FAQ

How can I connect to a published port from the outside world?

If you need to access your services from outside, use the following URL pattern http://ip<hyphen-ip>-<session_jd>-<port>.direct.labs.play-with-docker.com (i.e: http://ip2-135-3-b8ir6vbg5vr00095iil0-8080.direct.labs.play-with-docker.com).

Why is PWD running in ports 80 and 443? Can I change that?

No, it needs to run on those ports for DNS resolve to work. Ideas or suggestions about how to improve this are welcome

Troubleshooting

Errors like Failed to create inotify object: Too many open files, will require increasing user.max_inotify_instances with the command(s)

 sudo sysctl fs.inotify.max_user_instances=8192
 sudo sysctl fs.inotify.max_user_watches=524288
 sudo sysctl -p