Alternatives to terraform inventory

queglay · August 17, 2019, 11:57am

Hey everyone, this is my first post here.

I’m looking at alternative means to provide a dynamic inventory of my terraform infrastructure to ansible so that I can provision everything easily.

I’ve been running into issues with terraform-inventory in .12, and I’m wondering what other options there are that people would be able to recommend!

apparentlymart · August 19, 2019, 7:14pm

Hi @queglay!

I don’t have a suggestion for a ready-to-go answer, but the terraform show -json command added in Terraform 0.12 prints out the current state contents in a documented format which you could hopefully transform into a suitable shape for Ansible’s consumption using a small program.

queglay · August 20, 2019, 2:45am

No worries Martin, thanks for the suggestion. I made a playbook to add and update hosts ip’s, and add to a group in an inventory file after they are launched and its working fine so far for the basic functions needed.

In case anyone else needs it-

github.com

firehawkvfx/openfirehawk/blob/dev/ansible/inventory-add.yaml

# adds hosts / updates if present.  optionally add under a group name

- hosts: ansible_control
  remote_user: vagrant
  gather_facts: "{{ variable_gather_facts | default('true') }}"
  become: true
  
  vars:
    hosts_file: "/vagrant/{{ inventory }}/hosts"
    group_name: ''
    backup: false
  
  tasks:
    - name: ensure a 2 new lines exist at end of file always
      shell: |
        /vagrant/scripts/append_blank_line.sh {{ hosts_file }}
      become: true

    - name: update ansible_control or add if not exist
      lineinfile:

This file has been truncated. show original

…and accompanying bash script needed because lineinfile wasn’t able to give me what I needed-

github.com

firehawkvfx/openfirehawk/blob/dev/scripts/append_blank_line.sh

#!/bin/bash
file=$1
lastchar=$(tail -c1 $file)
if [[ $lastchar ]] ; then
    if [ -f "$file" ]; then
        echo 'ensure single blank line at EOF'
        echo ''>>$file
    fi
fi
lastchar2=$(tail -c2 $file)
if [[ $lastchar2 ]] ; then
    if [ -f "$file" ]; then
        echo 'ensure 2nd single blank line at EOF'
        echo ''>>$file
    fi
fi
#[[ $(tail -c1 $file) && -f $file ]]&&echo ''>>$file