CODEWITHSUNDEEP
amazon-ec2ansible
MeanwhileInHell
MeanwhileInHell

Reputation: 7053

Ansible: How to identify which EC2 instance is the current node to extract private IP

I need to update some configuration, which includes a list of all the EC2 nodes in my cluster, but also each node's configuration needs to know its own EC2 public and private IP address.

For the full list, I have the following:

- name: Gather EC2 facts on all nodes
  ec2_instance_facts:
    region: "{{ aws.region }}"
    filters:
      "tag:Type": nodeType
      "tag:Name": '{{ aws.ec2.nodes.name }}'
      "instance-state-name": running
  register: ec2_facts

Then gather all the IPs and add them to a group:

- name: Gather IPs for all hosts
  add_host: hostname={{ item.public_ip_address }} groups=allIpAddresses
  loop: "{{ ec2_facts.instances }}"
  when:
    - item.state.name == "running"

This groups variable is then used in another play and used to substitute out the values in an Ansible template:

- seeds: "{{ allIpAddresses[0] }},{{ allIpAddresses[1] }},{{ allIpAddresses[2] }},{{ allIpAddresses[3] }}"

However, I cannot seem to extract or identify which public and private IP is for the "current" host.

Upvotes: 0

Views: 1625

Answers (1)

2ps
2ps

Reputation: 15926

Use ec2_metadata_facts to gather facts in variables associated per instance. Alternatively, if you want to use ec2_instance_facts you would do a lookup based on the inventory_hostname:

sample play:

- name: gather ec2 facts per instance
  hosts: my_aws_instances
  gather_facts: no
  tasks:
    - ec2_metadata_facts:
    - name: debug
      debug: var=ansible_ec2_public_ipv4
    - name: debug
      debug: var=ansible_ec2_local_ipv4

Upvotes: 2

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