Learn Terraform & AWS

AWS Terraform Setup for semi-distributed Wordpress infrastructure

Builds an infrastructure consisting of:

• Two web servers (Wordpress)
• An Application Load Balancer for HTTP traffic
• Single MySQL DB
• Shared EFS storage between the Web servers
• Networking and security groups

Prerequisite:

• AWS IAM user with security credentials set (~/.aws/credentials)

• aws cli and terraform tools installed

Provisioning:

cd ~
git clone https://github.com/raychinov/learn-terraform-aws.git
cd learn-terraform-aws
terraform init
## The one command to bring up the infrastructure
terraform apply -auto-approve

Destroying the Infrastructure:

cd ~/learn-terraform-aws
## The one command to bring it down
terraform destroy -auto-approve

Particularities:

• The Wordpress setup is done on the Web server with id 0

• The output from the initializing script is in /tmp/init.log

• The DB optimizing cronjob runs in 2AM every Sunday, is placed in /etc/crontab and send the output to /var/log/optimize.log

• After Terraform reports, the build is up, it takes couple of minutes for the user-data script to bring up the Wordpress "Linux Namespaces" post

• The credentials and SSH key pairs are generated for every build. Pointers to to access credentials are given as output at the end of the run

• I used Hashicorp's Learn Terraform Advanced Deployment Strategies as a base for the project.