Overview

Create a 3 node Marathon / Mesos cluster with a single master node and 2 slave nodes. Two environments are currently supported.

• Vagrant - 3 local VMs running CoreOS on VirtualBox or VMware Fusion.
• Packet.net - 3 physical servers running CoreOS. You need an account with Packet.net to do this.

Vagrant Setup

1. Install dependencies

• VirtualBox 4.3.10 or greater.
• Vagrant 1.6 or greater.

2. Clone this project.

$ git clone https://github.com/force12/coreos-marathon/
$ cd coreos-marathon

3. Startup and SSH

Boxes are named core-01..03.

$ vagrant up
$ vagrant ssh core-01

4. Access web UIs

Once all the Docker images have been downloaded and started the web UIs will be availabled at. Note: This can take up to 10 minutes and the images themselves are large.

• Marathon: http://172.17.8.101:8080
• Mesos: http://172.17.8.101:5050

Vagrant Teardown

1. Delete Vagrant VMs.

vagrant destroy

Packet Setup

1. Register for an account with Packet.

2. Clone this project.

$ git clone https://github.com/force12/coreos-marathon/
$ cd coreos-marathon

3. Set API key and config.

# .env.packet

API_TOKEN=YOUR_API_KEY
PROJECT_NAME=example
DEVICE_PREFIX=core
PLAN=baremetal_1
# Parsippany, NJ
FACILITY=ewr1
# Either coreos_beta or coreos_alpha
OPERATING_SYSTEM=coreos_beta

4. Start cluster of 3 physical servers running CoreOS beta.

$ cp .env.packet .env

$ bundle install
$ bundle exec rake packet:cluster:create

Cluster is being provisioned

5. Check status of the console in the Packet web UI. Once all 3 servers are provisioned get the public IP address of the core-01 node. The Marathon web UI is available on port 8080 and Mesos web UI is on port 5050.

Packet Teardown

1. Shutdown server cluster.

$ bundle exec rake packet:cluster:destroy

Cluster has been shutdown

Bootstrapping

• A fresh discovery token is retrieved from discovery.etcd.io for each cluster.
• CoreOS cloud-config starts etcd2 and fleet and a oneshot unit that starts the cluster.
• A 3 node Consul cluster is bootstrapped using the etcd cluster.
• Zookeeper is registered with Consul and accessed via the Consul DNS interface.
• Mesos and Marathon use Zookeeper for service discovery.

Docker Image

The oneshot unit launches a Docker container using the image quay.io/rossf7/coreos-marathon:latest. This image is based on Alpine Linux and installs Ruby and the fleetctl binary. The container runs a Ruby script that starts the cluster using fleet.

Thanks

Thanks to Packet for the great support while we automated the cluster setup.

This template is based upon these projects.

• coreos-vagrant - Vagrant template and boxes provided by CoreOS.
• consul-coreos - bootstraps a Consul cluster using etcd2.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

License

This code is licensed under the MIT license.