Generate /etc/hosts with Ansible

etc-hosts.yml

---
# Idempotent way to build a /etc/hosts file with Ansible using your Ansible hosts inventory for a source.
# Will include all hosts the playbook is run on.
# Inspired from http://xmeblog.blogspot.com/2013/06/ansible-dynamicaly-update-etchosts.html

# https://gist.github.com/rothgar/8793800

- hosts: all
  tasks:
    - name: Build HBase /etc/hosts file
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item }}$'
        line: "{{ hostvars[item].ansible_default_ipv4.address }}       \
          {{ item }}.td.local    \
          {{ item }}.td.tda.com    \
          {{ item }}.tdv.com   \
          {{ item }}"
        state: present
      when: "(hostvars[item].ansible_default_ipv4 is defined) \
              and (hostvars[item].ansible_default_ipv4.address is defined) \
              and (ansible_virtualization_type != 'virtualbox')"
      with_items: "{{ groups['hbase-nodes']}}"
      become: yes

    - name: Build HBase /etc/hosts file
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item }}$'
        line: "{{ hostvars[item].ansible_all_ipv4_addresses[0] }}       \
          {{ item }}.td.local    \
          {{ item }}.td.tda.com    \
          {{ item }}.tdv.com   \
          {{ item }}"
        state: present
      when: "(hostvars[item].ansible_default_ipv4 is undefined) \
              and (hostvars[item].ansible_all_ipv4_addresses is defined) \
              and (ansible_virtualization_type != 'virtualbox')"
      with_items: "{{ groups['hbase-nodes']}}"
      become: yes

    - name: Build Appserver /etc/hosts file (AWS, AZure VMWare)
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item.split(".")[0] }}$'
        line: "{{ hostvars[item].ansible_default_ipv4.address }}       \
          {{ item.split('.')[0] }}.td.local    \
          {{ item.split('.')[0] }}.td.tda.com    \
          {{ item.split('.')[0] }}.tdv.com   \
          {{ item.split('.')[0] }}"
        state: present
      when: "(hostvars[item].ansible_default_ipv4 is defined) \
              and (hostvars[item].ansible_default_ipv4.address is defined) \
              and (ansible_virtualization_type != 'virtualbox') \
              and ('hbase-nodes' not in group_names)"
      with_items: "{{ groups['all'] | difference(groups['hbase-nodes']) }}"
      become: yes

    - name: Build Appserver /etc/hosts file (AWS, AZure, VMWare, Openstack)
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item.split(".")[0] }}$'
        line: "{{ hostvars[item].ansible_all_ipv4_addresses[0] }}       \
          {{ item.split('.')[0] }}.td.local    \
          {{ item.split('.')[0] }}.td.tda.com    \
          {{ item.split('.')[0] }}.tdv.com   \
          {{ item.split('.')[0] }}"
        state: present
      when: "(hostvars[item].ansible_default_ipv4 is undefined) \
              and (hostvars[item].ansible_all_ipv4_addresses is defined) \
              and (ansible_virtualization_type != 'virtualbox') \
              and ('hbase-nodes' not in group_names)"
      with_items: "{{ groups['all'] | difference(groups['hbase-nodes']) }}"
      become: yes

    - name: Build Appserver /etc/hosts file (Virtualbox/Vagrant)
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item.split(".")[0] }}$'
        line: "{{ hostvars[item].ansible_default_ipv4.address }}       \
          {{ item.split('.')[0] }}.td.local    \
          {{ item.split('.')[0] }}.td.tda.com    \
          {{ item.split('.')[0] }}.tdv.com   \
          {{ item.split('.')[0] }}"
        state: present
      when: "(hostvars[item].ansible_default_ipv4 is defined) \
              and (hostvars[item].ansible_default_ipv4.addresses is defined) \
              and (ansible_virtualization_type == 'virtualbox') \
              and ('hbase-nodes' not in group_names)"
      with_items: "{{ groups['hbase-nodes'] }}"
      become: yes

    - name: Replace IPs defined with ansible_host
      lineinfile:
        dest: /etc/hosts
        regexp: '\d+(\.\d+){3}.*{{ item }}$'
        line: "{{ hostvars[item].ansible_host }}       \
          {{ item }}.td.local    \
          {{ item }}.td.tda.com    \
          {{ item }}.tdv.com   \
          {{ item }}"
        state: present
      when: "(hostvars[item].ansible_host is defined) and (ansible_virtualization_type == 'virtualbox') and ('hbase-nodes' not in group_names)"
      with_items: "{{ groups['hbase-nodes'] }}"
      become: yes




##   ## vagrant - int db ##############################################################################
##   ...
##   ...
##   ## vagrant-hostmanager-start
##   172.28.128.3	node-app1.td.local
##   172.28.128.4	node-app2.td.local
##   ## vagrant-hostmanager-end
##   
##   192.1.1.1    hbase-hb01.td.local hbase-hb01.td.tda.com  hbase-hb01.tdv.com  hbase-hb01
##   192.1.1.2    hbase-hb02.td.local hbase-hb02.td.tda.com  hbase-hb02.tdv.com  hbase-hb02
##   ##################################################################################################
##   
##   
##   ## vagrant - ext db (ansible_host) ###############################################################
##   ...
##   ...
##   ## vagrant-hostmanager-start
##   172.28.128.3	node-app1.td.local
##   172.28.128.4	node-app2.td.local
##   ## vagrant-hostmanager-end
##   
##   10.153.1.1  hbase-hb01.td.local hbase-hb01.td.tda.com  hbase-hb01.tdv.com  hbase-hb01
##   10.153.1.2  hbase-hb02.td.local hbase-hb02.td.tda.com  hbase-hb02.tdv.com  hbase-hb02
##   ##################################################################################################
##   
##   
##   ## aws - int db ##################################################################################
##   ...
##   ...
##   192.168.1.1 	node-app1.ec2.local
##   192.168.1.2 	node-app2.ec2.local
##   
##   192.1.1.1    hbase-hb01.ec2.local hbase-hb01
##   192.1.1.2    hbase-hb02.ec2.local hbase-hb02
##   ##################################################################################################
##   
##   
##   ## aws - ext db (ansible_host) ###################################################################
##   ...
##   ...
##   10.50.0.1  	node-app1.ec2.local
##   10.50.0.2  	node-app2.ec2.local
##   
##   10.153.1.1  hbase-hb01.ec2.local hbase-hb01.td.tda.com hbase-hb01.tdv.com hbase-hb01
##   10.153.1.2  hbase-hb02.ec2.local hbase-hb01.td.tda.com hbase-hb01.tdv.com hbase-hb02
##   ##################################################################################################
##   
##   
##   ## vmw - ext db ##################################################################################
##   ...
##   ...
##   10.153.1.1  	node-app1.tdv.com node-app1
##   10.153.1.2  	node-app2.tdv.com node-app2
##   
##   10.153.1.3    hbase-hb01.tdv.com hbase-hb01
##   10.153.1.4    hbase-hb02.tdv.com hbase-hb02
##   ##################################################################################################

# vim: ft=ansible: