goployer is an application you can use for EC2 deployment. You can deploy in a blue/green mode. goployer only changes the autoscaling group so that you don't need to create another load balancer or manually attach autoscaling group to target group.

• You have to create a load balancer and target groups of it which goployer attach a new autoscaling group to.
• If you want to setup loadbalancer and target group with terraform, then please check this devopsart workshop.
• Please understand how goployer really deploys application before applying to the real environment.

• Here's the steps that goployer executes for deployment

1. Generate new version for current deployment.
   If other autoscaling groups of sample application already existed, for example hello-v001, then next version will be hello-v002
2. Create a new launch template.
3. Create autoscaling group with launch template from the previous step. A newly created autoscaling group will be automatically attached to the target groups you specified in manifest.
4. Check all instances of all stacks are healty. Until all of them pass healthchecking, it won't go to the next step.
5. (optional) If you add autoscaling in manifest, goployer creates autoscaling policies and put these to the autoscaling group. If you use alarms with autoscaling, then goployer will also create a cloudwatch alarm for autoscaling policy.
6. After all stacks are deployed, then goployer tries to delete previous versions of the same application. Launch templates of previous autoscaling groups are also going to be deleted.

• You can use spot instance option with goployer.
• There are two possible ways to use spot instance.

instance_market_options : You can set spot instance options and with this, you will only use spot instances.

    instance_market_options:
      market_type: spot
      spot_options:
        block_duration_minutes: 180
        instance_interruption_behavior: terminate # terminate / stop / hibernate
        max_price: 0.2
        spot_instance_type: one-time # one-time or persistent

mixed_instances_policy : You can mix on-demand and spot together with this setting.

    mixed_instances_policy:
      enabled: true
      override_instance_types:
        - c5.large
        - c5.xlarge
      on_demand_percentage: 20
      spot_allocation_strategy: lowest-price
      spot_instance_pools: 3
      spot_max_price: 0.3

You can see the detailed information in manifest format page.

• You can find few examples of manifest file so that you can test it with this.

cd examples/manifests