Infrastructure design pattern with loadbalancer, service and database.

Scheme of microservice is following:

+--------+                                  +------------------+
| User 1 | <--+                        +--> | Service server 1 | <--+
+--------+    |    +--------------+    |    +------------------+    |    +----+
              +--> | LoadBalancer | <--+                            +--> | DB |
+--------+    |    +--------------+    |    +------------------+    |    +----+
| User 2 | <--+                        +--> | Service server 2 | <--+
+--------+                                  +------------------+

                                                    ...

What is going on

The service contains API and MySQL model. There are three endpoints:

• / - contain information about container id
• /newTask - create new task and return its id, task is processed in background
• /tasks - list of all tasks, you can check status here

The whole service is duplicated behind LoadBalancer.

Prequisities

• Terraform
• DigitalOcean account

Setup

Just go to /terraform folder and fill terraform.tfvars, then do these commands:

terraform init     # setup terraform plugins
terraform plan     # preview the changes to infrastructure
terraform apply    # build infrastructure
terraform destroy  # when you've seen enough