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[IP/EKS] Add new subnets into the eks on AWS

Posted on June 15, 2023June 15, 2023 By nim No Comments on [IP/EKS] Add new subnets into the eks on AWS

Contents

Toggle
  • 1) Look into my case.
  • 2) Do It
    • 2.1) Define terraform configuration to create a new public subnet.

1) Look into my case.

Nếu EKS báo cáo rằng đã hết IP để cấp cho pod

Bạn check lại thì VPC có cidr = “10.195.88.0/21”

Bạn kiểm tra lại các subnet đang được sử dụng:

  azs                  = ["us-west-2c", "us-west-2b", "us-west-2a"]
  private_subnets      = ["10.195.89.0/24", "10.195.90.0/24", "10.195.91.0/24"]
  public_subnets       = ["10.195.92.0/24", "10.195.93.0/24", "10.195.94.0/24"]

Bạn lên chia subnet online và kiểm tra.

vậy đang còn 2 subnet chưa đươc sử dụng là: 10.195.88.0/24 và 192.168.95.0/24

Hiện tại eks của mình đang nằm trong public subnet.
và mình cần add 2 subnet kia vào trong public subnet.

Và các subnet mới phải được associate with this “route table public.”

2) Do It

2.1) Define terraform configuration to create a new public subnet.

Đầu tiên là file: c1-versions.tf

provider "aws" {
  region = "us-west-2"
}

Tiếp theo là tạo public subnet và kiên kêt với vpc va route table có sẵn

data "aws_vpc" "selected" {
  tags = {
    Name = "dev-nimtechnology-engine" # Replace with your VPC's tag name
  }
}

resource "aws_subnet" "public_subnet_2a_extended" {
  availability_zone = "us-west-2a"
  cidr_block        = "10.195.95.0/24"
  vpc_id            = data.aws_vpc.selected.id
  map_public_ip_on_launch = true

  tags = {
    Name                             = "dev-nimtechnology-engine-public-us-west-2a-extended"
    "kubernetes.io/cluster/dev-nimtechnology-engines" = "shared"
    "kubernetes.io/cluster/dev-nimtechnology-service" = "shared"
    "kubernetes.io/role/elb"        = "1"
  }
}

data "aws_route_table" "selected" {
  tags = {
    Name = "dev-nimtechnology-engine-public" # Replace with your Route tables's tag name
  }
}

resource "aws_route_table_association" "public_subnet" {
  subnet_id      = aws_subnet.public_subnet_2a_extended.id
  route_table_id = data.aws_route_table.selected.id
}

Sau khi bạn run terraform apply thì chúng ta sẽ có 1 subnet mới. và route ngon

Tiếp đến bạn add new subnet đó trong Auto scaling Group

và cuối cùng là làm mới instance và kiểm tra kết quả

AWS - Amazon Web Service

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