Terraform-provider-google: Container image option in google_compute_instance_template

[JasperWoo]

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Description

We can simplify application deployment by deploying containers to instances in managed instance groups. This is supported in GCP as here.

New or Affected Resource(s)

• google_compute_instance_template

Potential Terraform Configuration

resource "google_compute_instance_template" "default" {
...
  // New option: Deploy container from Google Container Registry
  container {
    source_image = "http://us.gcr.io/path_to_image:latest"
  }
  // Create a new boot disk from an image
  disk {
    source_image = "debian-cloud/debian-9"
    auto_delete  = true
    boot         = true
  }
...
}

References

1. https://cloud.google.com/compute/docs/containers/deploying-containers#managedinstancegroupcontainer
2. https://www.terraform.io/docs/providers/google/r/compute_instance_template.html
   
   • #0000

[mercuriete]

Hi i wanted this feature but I saw this is a beta feature:

https://cloud.google.com/sdk/gcloud/reference/beta/compute/instance-templates/create-with-container

It is posible to add create with container to the google-beta terraform provider?

anyways, I would like to have in addition to container.source_image the following:

container.env

--container-env=[KEY=VALUE, …,…]
Declare environment variables KEY with value VALUE passed to container. Only the last value of KEY is taken when KEY is repeated more than once.
Values, declared with --container-env flag override those with the same KEY from file, provided in --container-env-file.

container.arg

--container-arg=CONTAINER_ARG
Argument to append to container entrypoint or to override container CMD. Each argument must have a separate flag. Arguments are appended in the order of flags. Example:
Assuming the default entry point of the container (or an entry point overridden with --container-command flag) is a Bourne shell-compatible executable, in order to execute 'ls -l' command in the container, the user could use:

and so on.

Thank you very much.

[MartinLeedotOrg]

This is currently possible by using https://registry.terraform.io/modules/terraform-google-modules/container-vm/google/1.0.0 to generate the metadata.

Would rather see it natively though!

[paddycarver]

There's more information on this here: https://github.com/terraform-providers/terraform-provider-google/issues/1022#issuecomment-361774647

[AlistairB]

Hi,

--container-env, --container-arg and --container-image are now appearing in gcloud stable https://cloud.google.com/sdk/gcloud/reference/compute/instance-templates/create-with-container . As such I believe this is no longer blocked on upstream? Can we get these properties added?

There are also multiple other --container-* commands that would be nice to support.

FWIW, https://registry.terraform.io/modules/terraform-google-modules/container-vm/google/2.0.0 is nice, but custom modules add another layer of misdirection and can be hard to customize and understand what you are getting. I think they should be additive on existing working terraform google provider functionality.

[AlistairB]

@paddycarver Sorry for the ping. Can the upstream label be removed as per my above comment?