simple-infrastructure

This project is created only for educational purposes. So, feel free to fork and use it

Requirements

In order to use current build and deployment process you need to have:

• GitHub account (thanks captain obvious)
• AWS account and one existing KeyPair
• Travis CI account

Travis CI setup

Continuous integration and deployment process for current project is running on Travis CI.

• In order to proceed with Travis CI go to https://travis-ci.org and Sign Up using your GitHub account
• Now go to https://travis-ci.org/account/repositories and find simple-infrastructure. Switch on checkboxes it will allow you to build the project with Travis CI
• Now go to the job and press More options > Settings
• Here you need to add several environment variables like
  • AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY of your who has access to ecs*, cloudformation*, ec2*, iam*
  • AWS_DEFAULT_REGION where you specify AWS region where your cluster is deployed
  • SSH_KEY_NAME where you specify KeyPair name which will be used with your ECS Container instances
• Now run the build and enjoy the automation

High level architecture

Current infrastructure is deployed to AWS your AWS account using CloudFormation templates. There are two separate templates network_components.yml and network_components.yml.

network_components.yml deploys such components as:

• VPC
• Internet Gateway
• Two Private Subnets in two different AZs
• Two Public Subnets in two different AZs
• Two NAT Gateways in both Private Subnets
• Two Elastic IPs for NAT Gateways
• Route Tables for Subnets

cluster_components.yml deploys such components as:

• Two Security Groups.
  • Security group for ALB
  • Security group for ECS instances
• Four IAM roles and one Instance profile.
  • EC2 role
  • ECS Autoscaling role
  • ECS Task execution role
  • ECS Service role
• ECS Cluster
• Launch configuration and AutoScaling group
• Application Load Balancer and its Listener (which listens on port 80)

Figure 1. Simple random architecture

If you change infrastructure

If you desided to add or remove any component from infrastructure, please make that change also on diagram which is stored in .images/simple_random_infrastructure_diagram. Regenerate png file and update it in the README.md in High level architecture

Changes in source code

It is obviously that you may want to make some changes in source code or other components. So, here are several things that you should know:

• After you make a git push build will be trigered
• If build is trigered from master branch it will also run a deploy process
• If you are changing files which are not affecting the application you may not need to run build. So, in order to make commit without build you need to run commit command with [skip ci] in message body, for example:

git add README.md
git commit -m "Commit with something important in README.md [skip ci]"
git push