amazon-web-services - Terraform with aws to select ami based on tag with sort

Question

I'm building a Terraform config and I'm stuck with a tricky ami selection. My CI builds AMIs and add MyVersionTag on it based on the current build of the app on the CI. I would like to select the AMI based on this tag sort by version (X.Y.Z format) to take the latest.

Here is my command line using aws cli to select the AMI I want to use:

aws ec2 describe-images --filters 'Name=tag-key,Values=MyVersionTag' --query 'reverse(sort_by(Images[].{TagValue:Tags|[0].Value,ImageId:ImageId},&TagValue))|[0].ImageId'

I'm searching a way to configure an EC2 instance with this AMI id. I see 2 possible ways (please correct me):

• aws_instance with pure AMI ID as text (result of a command line through variable)
• aws_ami with filters

Any idea?

标签： amazon-web-servicesamazon-ec2terraformamazon-ami

Answer 1

我终于做的是使用external关键字。这是我的解决方案：

# example.tf

resource "aws_instance" "my-instance" {
  ami = data.external.latest_ami.result.ImageId
  # Other config
}

data "external" "latest_ami" {
  program = ["sh", "latest_ami_id.sh"]
  # Or simply
  program = ["aws", "ec2", "describe-images", "--filters", "Name=tag-key,Values=MyVersionTag", "--query", "reverse(sort_by(Images[].{TagValue:Tags|[0].Value,ImageId:ImageId},&TagValue))|[0].ImageId"]
}

# latest_ami_id.sh

#!/bin/bash

# It returns a json with following keys :
#. ImageId, Description, Tags (version actually)
aws ec2 describe-images --filters "Name=tag-key,Values=SecretCore" --query 'reverse(sort_by(Images[].{TagValue:Tags|[0].Value,ImageId:ImageId},&TagValue))|[0].ImageId'

希望它会帮助别人。