Create a Docker Swarm cluster with Terraform and Ansible

Do you want to start in the world of Infrastructure as Code with a useful case? Let's go creating a multicloud Docker Swarm cluster to run your microservices as a good starting point, using Terraform to provision servers and Ansible to install and configure Docker to run in Swarm mode.

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1. Create a Docker Swarm Cluster with Terraform and Ansible Marcelo Pinheiro @salizzar
3. $ whoami • Fireman / Problem Solver / Programmer since 2000 • Golang, Node.js, Erlang, Ruby, Python, Delphi, C++, C#, C, Java, PHP, ASP and Others • Fought, made coffee, negotiated deadlines • DevOps Engineer @ Work & Co
4. Infrastructure As Code. A developer’s perspective.
5. Infrastructure As Code • One of most traditional requirement that implies in some late in the projects is infrastructure: • Manual steps • Slow provision • Knowledge transfer issues
6. Infrastructure As Code • Infrastructure As Code ables you to manage resources using source code or CLI tools • Command-Line interfaces • Recipes to create, configure and manage infrastructure-related resources
7. Infrastructure As Code • Despite CLI it effectively solves, you can have some challenges: • Command-Line Interfaces not supports Idempotency • You still need to store knowledge into Bash scripts • More complexity to locally setup and run
8. Terraform. Infrastructure As Code without too much pain.
9. Terraform: Manage Cloud Infrastructure • Created by Hashicorp (Consul, Nomad, Vault and others) • Human-readable recipes using Hashicorp DSL • Server instances, virtual networks, object storage, DNS zones / entries, SaaS services and other resources • Ideal solution to manage resources that not changes frequently
10. Terraform: Manage Cloud Infrastructure • Multi-cloud support • Amazon Web Services • Microsoft Azure • Google Cloud • Microsoft Azure and Google Cloud requires some manual configuration steps to proceed
11. Yes. https://github.com/salizzar/terraform-recipes
12. Docker Swarm. The shortest path to Container Orchestration.
13. Docker Swarm: Orchestrate Containers • Docker Swarm is the orchestration solution for Docker hosts • A pool of servers • Workers: servers that will run all Docker containers • Managers: responsible to coordinate container’s execution between workers • Ordered in less complexity to implement: • Docker Swarm • AWS ECS • Kubernetes
14. Docker Swarm: Orchestrate Containers • Docker Swarm concepts • Service: a container definition to run in Swarm • Stack: a group of services that composes a application • In practice, is Docker Compose with additional definitions
15. For sure. https://github.com/salizzar/terraform-recipes
16. Ansible. Simple Configuration Management as it must be.
17. Ansible: Easy Configuration Management • CFEngine, Chef, Puppet and SaltStack uses master-agent architecture • One or more master servers • Each node have a client installed • Ansible is masterless architecture • You can run from your machine or any server that have it installed, just have the SSH keys
18. Ansible: Easy Configuration Management • We will setup a Docker Swarm cluster using ansible-playbook • Idempotency for the rescue • Deploy a Docker Swarm stack as example
19. Again. https://github.com/salizzar/terraform-recipes
20. Questions? Is free.
21. Thank you! :)