Ansible playbook for consul cluster bounce - ansible-playbook -i hosts.dev cluster_bounce.yml --ask-become-pass (peers.tmpl is in roles/consul/templates; sedfile is in roles/consul/files; main.yml is in roles/consul/vars)

cluster_bounce.yml

---
# This Playbook bounces a consul cluster that is unable to elect a leader

# push peers.json to the consul/raft data directory, change single quotes to doubles, restart consul servers
- hosts: consulservers
  become: yes

# update the peers.json file with the correct consul server ip addresses and port
  tasks:
    - include_vars: roles/consul/vars/main.yml

    - name: Create peers.json file
      template: src=roles/consul/templates/peers.tmpl dest={{ consul_data_path }}/raft/peers.json owner={{ consul_user }}

    - name: Copy sedfile
      copy: src=roles/consul/files/sedfile dest=/tmp/sedfile

    - name: Correct quotes
      shell: sed -i -f /tmp/sedfile {{ consul_data_path }}/raft/peers.json

    - name: restart consul server
      service: name=consul state=restarted

hosts.dev

[consulservers]
host1.domain.com
host2.domain.com
host3.domain.com

[consulagents]
host4.domain.com
host5.domain.com

main.yml

---
# roles/consul/vars/main.yml
consul_user: consul
consul_server_port: 8300
consul_data_path: /usr/local/data/consul

peers.tmpl

[{% for host in groups['consulservers'] %}
   "{{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}:{{ consul_server_port}}"
{% if not loop.last %},{% endif %}
{% endfor %}]

sedfile

s/'/\"/g