Terraform实战(三)-在AWS上尝试Terraform的Vault Provider

使用自Terraform 0.8起添加的Vault Provider后，aws云基础设施尝试从Vault而不是tfvars或环境变量中读取AWS凭证。

1 什么是vault？

vault是一种由Hashicorp发布的用于管理机密信息的工具。

2 aws使用Terraform的Vault Provider

2.1 创建静态密钥

以开发模式启动Vault。

在开发模式下，机密会记录在内存中，并在停止时清除。

$ vault server -dev

设置VAULT_ADDR环境变量以从客户端操作Vault。

$ export VAULT_ADDR=http://127.0.0.1:8200

在开发模式下，没有TLS，并且您在启动时以Unseal或root用户身份登录。
在实际环境中，访问保管库要求使用解锁密钥和用户身份验证进行解锁。
有关此区域的图像，我认为您应该体验官方的交互式教程。

静态写入AWS访问密钥/秘密访问密钥。

$ vault write secret/aws_test access_key=xxxxxxxxxxxxxx secret_key=xxxxxxxxxxxxxxxxxxxxSuccess! Data written to: secret/aws_test

如果您不想将其保留在shell历史记录中，请以JSON格式编写，并使用@指定文件

$ vault write secret/aws_test @data.json

2.2 创建一个TF文件

vault_generic_secret使用数据源。

我使用Terraform Module Registry中的ec2-instance模块启动了EC2。

data "vault_generic_secret" "aws_test" {path = "secret/aws_test"
}provider "aws" {access_key = "${data.vault_generic_secret.aws_test.data["access_key"]}"secret_key = "${data.vault_generic_secret.aws_test.data["secret_key"]}"region     = "ap-northeast-1"
}# fileter latest AMI
data "aws_ami" "amazon_linux" {most_recent = truefilter {name = "name"values = ["amzn-ami-hvm-*-x86_64-gp2",]}filter {name = "owner-alias"values = ["amazon",]}
}module "ec2-instance" {source = "terraform-aws-modules/ec2-instance/aws"name  = "aws_test_ec2"count = 1ami                    = "${data.aws_ami.amazon_linux.id}"instance_type          = "t2.micro"key_name               = "keyname"vpc_security_group_ids = ["sg-12345678"]
}

2.3 运行

terraform init
terraform plan
terraform apply

$terraform plan
Refreshing Terraform state in-memory prior to plan...
T he refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.data.vault_generic_secret.aws_test: Refreshing state...
data.aws_ami.amazon_linux: Refreshing state...
以下略..

如果未设置vault为unseal，则将输出以下错误：

$ terraform plan
Refreshing Terraform state in-memory prior to plan...
The refreshed state will be used to calculate this plan, but will not be
persisted to local or remote state storage.Error refreshing state: 1 error(s) occurred:* provider.vault: failed to create limited child token: Error making API request.URL: POST http://127.0.0.1:8200/v1/auth/token/create
Code: 503. Errors:* Vault is sealed