omarzl / playing_with_aws

Playground repo that I use to test AWS

Playing with AWS

This repository contains various playgrounds I use with AWS.

1. Auto Scaling Infra with Jenkins

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I am an iOS developer, so my main focus is on macOS infrastructure. However, before using Mac instances, I opted to set up two Linux infrastructures, which are cheaper, before moving to Mac.

This repository offers three Auto Scaling Infrastructure setups:

• Linux Virtual Instances Infra (free tier eligible)
• Linux Dedicated Hosts Infra
• Mac Dedicated Hosts Infra

You should first read this article that explains how to set everything up.

https://medium.com/@omarlagunas/ios-auto-scaling-infra-w-aws-jenkins-terraform-packer-and-bazel-4c189893b329

1.1 Linux Virtual instances Infra

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AWS offers t2.micro instances in their free tier.

Terraform

Run this command to set up the infrastructure:

terraform -chdir=linux-infra apply

Jenkins

The differences between the configuration of a macOS infra and this one are these parameters:

• Max Idle Minutes Before Scaledown: 5 (Because these instances are easy to terminate, they can scale down quickly)
• Maximum Init Connection Timeout in sec: 180 (I used the default value since they connect quickly)

The label should be ec2-linux-fleet so the Jenkinsfile located in jenkins/linux/Jenkinsfile works out of the box.

1.2 Linux Dedicated Hosts Infra

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I used a1 host family and a1.medium instances. Similar to macOS instances, it is required to request a limit increase for these dedicated hosts to use them.

Packer

Run this command to create the AMI with Packer:

packer build -var-file=config/linux.pkrvars.hcl .

Terraform

Run this command to set up the infrastructure:

terraform -chdir=linux-dh-infra apply

Jenkins

I used the same configuration as in Linux Virtual instances Infra

The label should be ec2-dh-linux-fleet so the Jenkinsfile located in jenkins/dh-linux/Jenkinsfile works out of the box.

1.3 Mac Dedicated Hosts Infra

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I used mac2 host family and mac2 .metal instances. It is required to request a limit increase for these dedicated hosts to use them.

Packer

Run this command to create the AMI with Packer:

packer build -var-file=config/macos.pkrvars.hcl .

Terraform

Run this command to set up the infrastructure:

terraform -chdir=macos-dh-infra apply

Jenkins

The configuration can be found in the article.

The label should be ec2-dh-mac-fleet so the Jenkinsfile located in jenkins/mac/Jenkinsfile works out of the box.