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swarm-provisioner

Just a simple Ansible playbook in order to do provisioning of Docker Swarm nodes on AWS.

Why?

I'm setting up a Docker Swarm Cluster inside AWS and I need do all the basic stuff with specific constraints related to cluster types. I could do all that kind of stuff with simple bash scripts using the AWS EC2 User Data: by the way I wanted to practicing with Ansible and... here we are!

How to use

Hosts files

Provisioning should be executed on local machine: nodes should be unreachable via remote SSH (or at least there should be a Security Group with port #22 open only to your IP address).

This playbook was designed to be executed on boot, so it will run on localhost. Feel free to edit hosts file but keep in mind that provisioning should be automated.

Setting up a master

Just run the playbook with the command ansible-playbook -i hosts -c local master.yml -e engine_role={YOUR_ROLE}.

  • engine_role: refers to Docker engine label you would like to attach to node: maybe you want to keep tidy and clean your master node avoiding the run of production containers.

Remember to keep somewhere the swarm token and address listener in order to enable worker join!

Setting up a worker

Just run the playbook with the command ansible-playbook -i hosts -c local worker.yml -e engine_role={YOUR_ROLE} -e token={SWARM_TOKEN} -e address={SWARM_ADDRESS}.

  • engine_role: refers to Docker engine label you would like to attach to node: this is useful to create constraints over cluster groups (you can run only some kinds of services over a specific Auto Scaling Group, maybe for performances or in order to make easier the scale down of a service).

  • token: the Swarm cluster Token obtained via Master election.

  • address: the Swarm cluster master address obtained via Master election.

Dependencies

In case of provisioning Python and PIP should be already installed in order to download and setup Ansible.

JFI

The Ansible Playbook is optimized for AWS Linux distribution based on YUM package manager: you can edit in order to use apt or whatever you want: feel free to PR!