tpro/snapshots_2021jan_pseudo-containerized

HashiCorp Snapshot Pseudo-containerized (Jan 2021)

Demo environment set up

If you already have Nomad/Consul cluster, please ignore this section.

1. Go to terraform directory.

2. Modifiy variables.tf to match your AWS settings

3. Run terraform apply

   This apply creates Nomad and Consul server and clients.

4. Once apply finishes, go to nomad directory.

   Run:

. env_setup.sh

This script will set some environment variables necessary for consul and nomad to work.

• NOMAD_ADDR
• CONSUL_ADDR
• CONSUL_HTTP_ADDR
• CONSUL_HTTP_TOKEN

Build an artifact

1. Go to nomad/artifact directory.

   There are 2 GO programs, frontend and backend. Frontend app requests backend app for some data and renders a webpage with data embedded.

2. Modify Makefile

   Please set S3 bucket and object to yours. This is where the artifacts will be stored.

3. Run make to build and deploy (s3 upload) your apps.

Nomad job file

1. Please change the local.artifact variable to your S3 path.

Run the demo

1. Submit job file to Nomad.

nomad job run run_front_back.nomad

2. Nomad will deploy frontend and backend apps, and registers the app to Consul service catalog.

   you can access the Nomad UI at $NOMAD_ADDR

3. Check consul's service catalog

   you can access the Consul UI at $CONSUL_HTTP_ADDR

4. Once frontend service becomes healthy, run following script to get a frontend URL.

./get_frontend_url.sh

Access the URL to see your application.

Additional things to try

Change the number of services to deploy.

• Change `attrib_v1.["task_count"]

ariable attrib_v1 {
	type = object({
		version = string,
		task_count = number,
		text_color = string,
	})
	default = {
		version = "v1",
		task_count = 1,		// <----
		text_color = "green",
	}
}

Deploy app v2

• Change `attrib_v2.["task_count"]

variable attrib_v2 {
	type = object({
		version = string,
		task_count = number,
		text_color = string,
	})
	default = {
		version = "v2",
		task_count = 0,   // <-----
		text_color = "red",
	}
}

Set L7 routing

1. Go to consul_config directory.

2. Examine L7 routing settings.

• service-defaults.hcl
• service-resolver.hcl
• service-router.hcl

3. Run the script or commands to set the config

consul config write service-defaults.hcl
consul config write service-resolver.hcl
consul config write service-router.hcl

4. Additionally you can try splitter.

• service-splitter.hcl

consul config write service-splitter.hcl