在“预配器”块上的AWS EC2实例上运行Hashicorp Vault服务器

Question

我正在创建一个AWS实例，并尝试在创建时运行Vault服务器。我的问题是创建过程永远不会完成，因为服务器没有在后台运行。这是我的配置：

resource "aws_instance" "web" {
  ami           = "ami-466768ac"
  instance_type = "t2.micro"
  key_name = "my_key"

  tags {
    Name = "Vault"
  }

  provisioner "remote-exec" {

    connection {
      type        = "ssh"
      agent       = false
      user        = "ec2-user"
      private_key = "${file("/path/to/my_key")}"
    }

    inline = [
      "curl -O https://releases.hashicorp.com/vault/0.10.4/vault_0.10.4_linux_amd64.zip",
      "unzip vault_0.10.4_linux_amd64.zip",
      "./vault server -dev -dev-listen-address=0.0.0.0:8200"
    ]
  }

}

基本上，我通过curl下载Vault并运行开发服务器。服务器实际上是运行的（我在终端日志中看到它），但实例创建（由Terraform）永远不会完成：

aws_instance.web: Still creating... (40s elapsed)
aws_instance.web: Still creating... (50s elapsed)
aws_instance.web: Still creating... (1m0s elapsed)
aws_instance.web: Still creating... (1m10s elapsed)
aws_instance.web: Still creating... (1m20s elapsed)
aws_instance.web: Still creating... (1m30s elapsed)
...

我试图添加<代码>

如何在创建实例时以后台模式启动服务器？

编辑

我也试过nohup：

nohup ./vault server -dev -dev-listen-address=0.0.0.0:8200

但当terraform完成时服务器并没有启动。。。

Answer 1

这不是Terraform特定的东西，如果你SSH一个实例并运行你的命令，你会看到它在进程处于前台时被阻塞，如果你通过添加来背景化它

这里的解决方案是使用nohup，以便Vault服务器进程将忽略您的HUP（或挂断）信号，该信号在您的会话存在时触发。

因此，您应该将命令更改为：

...
    inline = [
      "curl -O https://releases.hashicorp.com/vault/0.10.4/vault_0.10.4_linux_amd64.zip",
      "unzip vault_0.10.4_linux_amd64.zip",
      "nohup ./vault server -dev -dev-listen-address=0.0.0.0:8200 &"
    ]
...

Answer 2

最后，正如@StephenKing在评论中告诉我的那样，我创建了一个systemd服务。这是我的配置：

resource "aws_instance" "web" {
  ami           = "ami-466768ac"
  instance_type = "t2.micro"
  key_name = "my_key"

  tags {
    Name = "Vault"
  }

  //upload vault.service file (systemd unit)
  provisioner "file" {
    connection {
      type        = "ssh"
      agent       = false
      user        = "ec2-user"
      private_key = "${file("/path/to/my/key")}"
    }
    source = "./vault.service"
    destination = "/home/ec2-user/vault.service"
  }

  //download vault and start service
  provisioner "remote-exec" {
    connection {
      type        = "ssh"
      agent       = false
      user        = "ec2-user"
      private_key = "${file("/path/to/my/key")}"
    }
    inline = [
      "curl -O https://releases.hashicorp.com/vault/0.10.4/vault_0.10.4_linux_amd64.zip",
      "unzip vault_0.10.4_linux_amd64.zip",
      "sudo mv /home/ec2-user/vault.service /etc/systemd/system/",
      "sudo systemctl start vault.service"
    ]
  }

}

vault.service

[Unit]
Description=Vault dev server

[Service]
ExecStart=/home/ec2-user/vault server -dev -dev-listen-address=0.0.0.0:8200