Terraform,如何在现有资源上运行配置程序?

时间:2016-06-16 17:41:05

标签: openstack provisioning terraform

我的问题类似于这个git hub帖子:

https://github.com/hashicorp/terraform/issues/745

它还与我的另一个堆栈交换帖有关:

Terraform stalls while trying to get IP addresses of multiple instances?

我正在尝试引导多个服务器,并且我需要在我的实例上运行几个命令,这些命令需要所有其他实例的IP地址。但是,在创建实例之前,我无法访问包含新创建实例的IP地址的变量。所以当我尝试像这样运行provisioner "remote-exec"块时:

  provisioner "remote-exec" {
    inline = [
      "sudo apt-get update",
      "sudo apt-get install -y curl",
      "echo ${openstack_compute_instance_v2.consul.0.network.0.fixed_ip_v4}",
      "echo ${openstack_compute_instance_v2.consul.1.network.1.fixed_ip_v4}",
      "echo ${openstack_compute_instance_v2.consul.2.network.2.fixed_ip_v4}"
    ]
  }

没有任何事情发生,因为所有实例都在等待所有其他实例完成创建,因此首先不创建任何内容。所以我需要一种方法来创建我的资源,然后在创建它们之后运行我的provisioner "remote-exec"块命令,terraform可以访问我所有实例的IP地址。

2 个答案:

答案 0 :(得分:3)

解决方案是创建一个resource "null_resource" "nameYouWant" { },然后在其中运行命令。它们将在创建初始资源后运行:

resource "aws_instance" "consul" {
  count = 3
  ami = "ami-ce5a9fa3"
  instance_type = "t2.micro"
  key_name = "ansible_aws"
  tags {
    Name = "consul"
  }
}

resource "null_resource" "configure-consul-ips" {
  count = 3

  connection {
    user = "ubuntu"
    private_key="${file("/home/ubuntu/.ssh/id_rsa")}"
    agent = true
    timeout = "3m"
  }

  provisioner "remote-exec" {
    inline = [
      "sudo apt-get update",
      "sudo apt-get install -y curl",
      "sudo echo '${join("\n", aws_instance.consul.*.private_ip)}' > /home/ubuntu/test.txt"
    ]
  }
}

另见答案:

Terraform stalls while trying to get IP addresses of multiple instances?

非常感谢@ydaetskcor的回答

答案 1 :(得分:0)

除了@ alex-cohen答案外,还有https://github.com/hashicorp/terraform/issues/8266#issuecomment-454377049的另一个提示。

如果要发起对local-exec的调用,无论创建资源如何,请使用triggers

resource "null_resource" "deployment" {
  provisioner "local-exec" {
    command = "echo ${PATH} > output.log"
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}