Module: Pangea::Kubernetes::Backends::AwsEks

Includes:
Base
Defined in:
lib/pangea/kubernetes/backends/aws_eks.rb

Overview

AWS EKS backend — creates managed EKS clusters with VPC, IAM, and node groups.

Class Method Summary collapse

Methods included from Base

included

Class Method Details

.backend_name ⇒ Object 



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 27

def backend_name = :aws

.create_cluster(ctx, name, config, result, tags) ⇒ Object

Create the EKS cluster



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 127

def create_cluster(ctx, name, config, result, tags)
  # Determine subnet IDs
  subnet_ids = if config.network&.subnet_ids&.any?
                 config.network.subnet_ids
               elsif result.network
                 if result.network.respond_to?(:subnet_ids)
                   result.network.subnet_ids
                 else
                   result.network.select { |k, _| k.to_s.start_with?('subnet_') }.values.map(&:id)
                 end
               else
                 []
               end

  # Determine role ARN
  role_arn = config.role_arn || result.iam&.dig(:cluster_role)&.arn

  cluster_attrs = {
    name: "#{name}-cluster",
    role_arn: role_arn,
    version: config.kubernetes_version,
    vpc_config: {
      subnet_ids: subnet_ids,
      endpoint_private_access: config.network&.private_endpoint || true,
      endpoint_public_access: config.network&.public_endpoint || false,
      security_group_ids: config.network&.security_group_ids || []
    },
    tags: tags.merge(Name: "#{name}-cluster")
  }

  cluster_attrs[:enabled_cluster_log_types] = config.logging if config.logging.any?

  if config.encryption_at_rest
    cluster_attrs[:encryption_config] = {
      resources: ['secrets']
    }
  end

  ctx.aws_eks_cluster(:"#{name}_cluster", cluster_attrs)
end

.create_iam(ctx, name, config, tags) ⇒ Object

Create IAM role for the EKS cluster and node groups



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 70

def create_iam(ctx, name, config, tags)
  iam = Architecture::AwsEksIamResult.new

  # Cluster role — use provided role_arn or create one
  unless config.role_arn
    assume_role_policy = {
      Version: '2012-10-17',
      Statement: [{
        Effect: 'Allow',
        Principal: { Service: 'eks.amazonaws.com' },
        Action: 'sts:AssumeRole'
      }]
    }

    iam.cluster_role = ctx.aws_iam_role(
      :"#{name}_cluster_role",
      name: "#{name}-eks-cluster-role",
      assume_role_policy: assume_role_policy,
      tags: tags.merge(Name: "#{name}-cluster-role")
    )

    iam.cluster_policy_attachment = ctx.aws_iam_role_policy_attachment(
      :"#{name}_cluster_policy",
      role: iam.cluster_role.ref(:name),
      policy_arn: 'arn:aws:iam::aws:policy/AmazonEKSClusterPolicy'
    )
  end

  # Node role
  node_assume_role_policy = {
    Version: '2012-10-17',
    Statement: [{
      Effect: 'Allow',
      Principal: { Service: 'ec2.amazonaws.com' },
      Action: 'sts:AssumeRole'
    }]
  }

  iam.node_role = ctx.aws_iam_role(
    :"#{name}_node_role",
    name: "#{name}-eks-node-role",
    assume_role_policy: node_assume_role_policy,
    tags: tags.merge(Name: "#{name}-node-role")
  )

  %w[AmazonEKSWorkerNodePolicy AmazonEKS_CNI_Policy AmazonEC2ContainerRegistryReadOnly].each do |policy|
    ctx.aws_iam_role_policy_attachment(
      :"#{name}_node_#{policy.downcase.gsub(/[^a-z0-9]/, '_')}",
      role: iam.node_role.ref(:name),
      policy_arn: "arn:aws:iam::aws:policy/#{policy}"
    )
  end

  iam
end

.create_network(ctx, name, config, tags) ⇒ Object

Create VPC + subnets for the EKS cluster



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 41

def create_network(ctx, name, config, tags)
  network = Architecture::NetworkResult.new

  vpc_cidr = config.network&.vpc_cidr || '10.0.0.0/16'
  network.vpc = ctx.aws_vpc(
    :"#{name}_vpc",
    cidr_block: vpc_cidr,
    enable_dns_hostnames: true,
    enable_dns_support: true,
    tags: tags.merge(Name: "#{name}-vpc")
  )

  # Create 2 subnets in different AZs (EKS requirement)
  %w[a b].each_with_index do |az_suffix, idx|
    subnet = ctx.aws_subnet(
      :"#{name}_subnet_#{az_suffix}",
      vpc_id: network.vpc.id,
      cidr_block: "10.0.#{idx}.0/24",
      availability_zone: "#{config.region}#{az_suffix}",
      map_public_ip_on_launch: true,
      tags: tags.merge(Name: "#{name}-subnet-#{az_suffix}")
    )
    network.add_subnet(:"subnet_#{az_suffix}", subnet)
  end

  network
end

.create_node_pool(ctx, name, cluster_ref, pool_config, tags) ⇒ Object

Create an EKS managed node group



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 169

def create_node_pool(ctx, name, cluster_ref, pool_config, tags)
  pool_name = :"#{name}_#{pool_config.name}"

  node_group_attrs = {
    cluster_name: cluster_ref.ref(:name),
    node_group_name: "#{name}-#{pool_config.name}",
    node_role_arn: "${aws_iam_role.#{name}_node_role.arn}",
    instance_types: pool_config.instance_types,
    scaling_config: {
      desired_size: pool_config.effective_desired_size,
      min_size: pool_config.min_size,
      max_size: pool_config.max_size
    },
    disk_size: pool_config.disk_size_gb,
    tags: tags.merge(
      Name: "#{name}-#{pool_config.name}",
      NodePool: pool_config.name.to_s
    )
  }

  node_group_attrs[:labels] = pool_config.labels if pool_config.labels.any?

  if pool_config.taints.any?
    node_group_attrs[:taint] = pool_config.taints.map do |t|
      { key: t[:key], value: t[:value], effect: t[:effect] }
    end
  end

  ctx.aws_eks_node_group(pool_name, node_group_attrs)
end

.load_provider! ⇒ Object 



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 31

def load_provider!
  require required_gem
rescue LoadError => e
  raise LoadError,
        "Backend :aws requires gem 'pangea-aws'. " \
        "Add it to your Gemfile: gem 'pangea-aws'\n" \
        "Original error: #{e.message}"
end

.managed_kubernetes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 28

def managed_kubernetes? = true

.required_gem ⇒ Object 



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# File 'lib/pangea/kubernetes/backends/aws_eks.rb', line 29

def required_gem = 'pangea-aws'