[AWS] Deploying Redis on AWS

Posted on By nim No Comments on [AWS] Deploying Redis on AWS

Bài này chúng ta sẽ cài đặt redis trên AWS thông qua terraform.
Mình thao khảo bài viết bên dưới.
https://viblo.asia/p/aws-elasticache-provisioning-with-terraform-x7Z4D6xoLnX

Chúng ta bắt tay tôi

1) VPC and anything is related to redis

Đầu tiên bạn cần tạo VPC nếu bạn chưa có VPC và subnet
và bạn cũng phải tạo cho nó một subnet group

>>>>>>>>>>>
>>>>vpc.tf
>>>>>>>>>>>>


# Create VPC Terraform Module
module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.11.0"
  #version = "~> 3.11"

  # VPC Basic Details
  name = local.redis_cluster_name
  cidr = var.vpc_cidr_block
  azs             = data.aws_availability_zones.available.names
  public_subnets  = var.vpc_public_subnets
  private_subnets = var.vpc_private_subnets  

  #Elasticache Subnets
  elasticache_subnets = var.vpc_elasticache_subnets
  create_elasticache_subnet_group = var.vpc_create_elasticache_subnet_group
  create_elasticache_subnet_route_table = var.vpc_create_elasticache_subnet_route_table
  # create_elasticache_internet_gateway_route = true
  # create_elasticache_nat_gateway_route = true
  
  # NAT Gateways - Outbound Communication
  enable_nat_gateway = var.vpc_enable_nat_gateway 
  single_nat_gateway = var.vpc_single_nat_gateway

  # VPC DNS Parameters
  enable_dns_hostnames = true
  enable_dns_support   = true

  
  tags = local.common_tags
  vpc_tags = local.common_tags

  # Additional Tags to Subnets
  public_subnet_tags = {
    Type = "Public Subnets"
    "kubernetes.io/role/elb" = 1    
    "kubernetes.io/cluster/${local.redis_cluster_name}" = "shared"        
  }
  private_subnet_tags = {
    Type = "private-subnets"
    "kubernetes.io/role/internal-elb" = 1    
    "kubernetes.io/cluster/${local.redis_cluster_name}" = "shared"    
  }

  elasticache_subnet_tags = {
    Type = "database-subnets"
  }
}

data "aws_availability_zones" "available" {}


resource "aws_elasticache_subnet_group" "redis" {
  name       = "nimtechnology-cache-subnet"
  subnet_ids = module.vpc.elasticache_subnets
}

Hình trên AWS:

Tạo security Group:

#
# Security group resources
#
resource "aws_security_group" "redis" {
  vpc_id = module.vpc.vpc_id

  ingress {
    from_port   = 6379
    to_port     = 6379
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }


  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  #https://stackoverflow.com/questions/43980946/define-tags-in-central-section-in-terraform
  tags = merge(
    local.common_tags,
    tomap({
      "Name"      = "sgCacheCluster" ##look into
    })
  )

  # the "map" function was deprecated in Terraform v0.12
  # tags = merge(
  #   local.common_tags,
  #   map(
  #     "Name", "sgCacheCluster",
  #     "Project", var.project,
  #   )
  # )

  lifecycle {
      create_before_destroy = true
  } 

}

2) Amazon ElastiCache

2.1) Redis Cluster Mode Disabled

Đa số trong thực tế thì mình hay gặp con redis Redis Cluster Mode Disabled trên nhiều môi trường

Ở dạng deploy này, ta sẽ có một Redis Cluster chỉ có 1 Shard với số lượng node của Shard là 1 tới 6 node.

Parameter groups
>>>>>>>>>>>
>>>>redis.tf
>>>>>>>>>>>>>>>>>>>>>

# Input Variables
# AWS Region
variable "aws_region" {
  description = "Region in which AWS Resources to be created"
  type = string
  default = "us-east-1"  
}

variable "env" {
  description = "Environment in which AWS Resources to be created"
  type = string
  default = "develop"  
}

variable "family" {
  type = string
  default = "redis5.0"
}

locals {
  name = "nimtechnology"
  common_tags = {
    Component   = "nimtechnology"
    Environment = var.env
  }
  redis_cluster_name = "${local.name}-${var.cluster_name}"  
}

variable "cluster_name" {
  default = "aws-redis"
}

# VPC CIDR Block
variable "vpc_cidr_block" {
  description = "VPC CIDR Block"
  type = string 
  default = "10.0.0.0/16"
}

# VPC Database Subnets
variable "vpc_elasticache_subnets" {
  description = "VPC Redis Subnets"
  type = list(string)
  default = ["10.0.151.0/24", "10.0.152.0/24"]
}

# VPC Create Database Subnet Group (True / False)
variable "vpc_create_elasticache_subnet_group" {
  description = "VPC Create Redis Subnet Group"
  type = bool
  default = true 
}

# VPC Create Database Subnet Route Table (True or False)
variable "vpc_create_elasticache_subnet_route_table" {
  description = "VPC Create Redis Subnet Route Table"
  type = bool
  default = true   
}

# VPC Public Subnets
variable "vpc_public_subnets" {
  description = "VPC Public Subnets"
  type = list(string)
  default = ["10.0.101.0/24", "10.0.102.0/24"]
}

# VPC Private Subnets
variable "vpc_private_subnets" {
  description = "VPC Private Subnets"
  type = list(string)
  default = ["10.0.1.0/24", "10.0.2.0/24"]
}

# VPC Enable NAT Gateway (True or False) 
variable "vpc_enable_nat_gateway" {
  description = "Enable NAT Gateways for Private Subnets Outbound Communication"
  type = bool
  default = true  
}

# VPC Single NAT Gateway (True or False)
variable "vpc_single_nat_gateway" {
  description = "Enable only single NAT Gateway in one Availability Zone to save costs during our demos"
  type = bool
  default = true
}

variable "cache_identifier" {
  default = "redis-cluster-mode-enable-nimtechnology"
}

variable "automatic_failover_enabled" {
  default = true
}

variable "multi_az_enabled" {
  default = true
}

variable "alarm_cpu_threshold" {
  default = "75"
}

variable "desired_clusters" {
  default = "3"
}

variable "instance_type" {
  default = "cache.t2.micro"
}

variable "engine_version" {
  default = "5.0.6"
}

variable "maintenance_window" {
  default = "sun:02:30-sun:03:30"
}

variable "at_rest_encryption_enabled" {
  type        = bool
  default     = true
  description = "Enable encryption at rest"
}

variable "transit_encryption_enabled" {
  type        = bool
  default     = true
  description = <<-EOT
    Set `true` to enable encryption in transit. Forced `true` if `var.auth_token` is set.
    If this is enabled, use the [following guide](https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/in-transit-encryption.html#connect-tls) to access redis.
    EOT
}


variable "sns_topic_name" {
  type = string
  default = "Unknown"
}

và cuối cùng ta file variable.tf

# Input Variables
# AWS Region
variable "aws_region" {
  description = "Region in which AWS Resources to be created"
  type = string
  default = "us-east-1"  
}

variable "env" {
  description = "Environment in which AWS Resources to be created"
  type = string
  default = "develop"  
}

variable "family" {
  type = string
  default = "redis5.0"
}

locals {
  name = "nimtechnology"
  common_tags = {
    Component   = "nimtechnology"
    Environment = var.env
  }
  redis_cluster_name = "${local.name}-${var.cluster_name}"  
}

variable "cluster_name" {
  default = "aws-redis"
}

# VPC CIDR Block
variable "vpc_cidr_block" {
  description = "VPC CIDR Block"
  type = string 
  default = "10.0.0.0/16"
}

# VPC Database Subnets
variable "vpc_elasticache_subnets" {
  description = "VPC Redis Subnets"
  type = list(string)
  default = ["10.0.151.0/24", "10.0.152.0/24"]
}

# VPC Create Database Subnet Group (True / False)
variable "vpc_create_elasticache_subnet_group" {
  description = "VPC Create Redis Subnet Group"
  type = bool
  default = true 
}

# VPC Create Database Subnet Route Table (True or False)
variable "vpc_create_elasticache_subnet_route_table" {
  description = "VPC Create Redis Subnet Route Table"
  type = bool
  default = true   
}

# VPC Public Subnets
variable "vpc_public_subnets" {
  description = "VPC Public Subnets"
  type = list(string)
  default = ["10.0.101.0/24", "10.0.102.0/24"]
}

# VPC Private Subnets
variable "vpc_private_subnets" {
  description = "VPC Private Subnets"
  type = list(string)
  default = ["10.0.1.0/24", "10.0.2.0/24"]
}

# VPC Enable NAT Gateway (True or False) 
variable "vpc_enable_nat_gateway" {
  description = "Enable NAT Gateways for Private Subnets Outbound Communication"
  type = bool
  default = true  
}

# VPC Single NAT Gateway (True or False)
variable "vpc_single_nat_gateway" {
  description = "Enable only single NAT Gateway in one Availability Zone to save costs during our demos"
  type = bool
  default = true
}

variable "cache_identifier" {
  default = "redis-cluster-mode-enable-nimtechnology"
}

variable "automatic_failover_enabled" {
  default = true
}

variable "multi_az_enabled" {
  default = true
}

variable "alarm_cpu_threshold" {
  default = "75"
}

variable "desired_clusters" {
  default = "3"
}

variable "instance_type" {
  default = "cache.t2.micro"
}

variable "engine_version" {
  default = "5.0.6"
}

variable "maintenance_window" {
  default = "sun:02:30-sun:03:30"
}

variable "at_rest_encryption_enabled" {
  type        = bool
  default     = true
  description = "Enable encryption at rest"
}

variable "transit_encryption_enabled" {
  type        = bool
  default     = true
  description = <<-EOT
    Set `true` to enable encryption in transit. Forced `true` if `var.auth_token` is set.
    If this is enabled, use the [following guide](https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/in-transit-encryption.html#connect-tls) to access redis.
    EOT
}


variable "sns_topic_name" {
  type = string
  default = "Unknown"
}

Và đây là thành quả.

AWS - Amazon Web Service

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