feat: Allow snapshot_id to be specified for additional_ebs_volumes

[omjadas]

PR o'clock

Description

Allow additional ebs volumes to be created from snapshots.

Checklist

• README.md has been updated after any changes to variables and outputs. See https://github.com/terraform-aws-modules/terraform-aws-eks/#doc-generation

[omjadas]

@antonbabenko @daroga0002 would it be possible to get a review for this PR?

[daroga0002]

@antonbabenko @daroga0002 would it be possible to get a review for this PR?

I will look into this, do you maybe have a example of module configuration which I can use for testing?

[omjadas]

I will look into this, do you maybe have a example of module configuration which I can use for testing?

Sure thing, the following works to illustrate its use (we use a similar config in order to decrease pod start times on fresh nodes).

1. Apply the following
2. Create a snapshot from the /dev/xvdb volume on the instance that starts up
3. Update snapshot_id with ID of created snapshot
4. Apply

# main.tf

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.37"
    }
  }
  required_version = "~> 1.0"
}

provider "aws" {
  region = local.region
}

locals {
  region      = "us-west-2"
  k8s_version = "1.21"
}

data "aws_vpc" "default" {
  default = true
}

data "aws_subnet_ids" "default" {
  vpc_id = data.aws_vpc.default.id
}

module "eks" {
  source = "github.com/omjadas/terraform-aws-eks?ref=feat%2Fsnapshot_id"

  create_eks       = true
  cluster_name     = "test-cluster"
  cluster_version  = local.k8s_version
  vpc_id           = data.aws_vpc.default.id
  subnets          = data.aws_subnet_ids.default.ids
  manage_aws_auth  = false
  enable_irsa      = false
  write_kubeconfig = false

  worker_ami_name_filter = "bottlerocket-aws-k8s-${local.k8s_version}-x86_64-v*"

  worker_groups_launch_template = [
    {
      name                   = "nodes"
      asg_min_size           = 1
      asg_max_size           = 1
      asg_desired_capacity   = 1
      default_cooldown       = 60
      instance_type          = "t3a.medium"
      protect_from_scale_in  = false
      public_ip              = true
      userdata_template_file = "${path.module}/userdata.toml.tpl"
      root_encrypted         = true
      root_volume_type       = "gp3"
      additional_ebs_volumes = [
        {
          block_device_name = "/dev/xvdb"
          encrypted         = true
          volume_size       = 50
          volume_type       = "gp3"
          # snapshot_id       = "<<snapshot id here>>"
        }
      ]
    }
  ]
}

# userdata.toml.tpl

[settings.kubernetes]
api-server = "${endpoint}"
cluster-certificate ="${cluster_auth_base64}"
cluster-name = "${cluster_name}"

[daroga0002]

I have tested and is working nice so can be merged 🚀

@omjadas thank you for contribution

@antonbabenko this can be merged, I have 3 more PRs to test and then we can make consolidated release

[github-actions]

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