Introducing listen_ip variable that overrides

the default listen_ip.

make a loop for more flexibility.

Get a listen ip specifically for that host.

see if components have listen_ip defined before using ansible_default_ipv4

Make service files look for listen_ip variable.

implemented listen_ip variable here too

roles/keystone/templates/keystone.service

@@ -9,8 +9,8 @@ Restart=always
 ExecStartPre=-/usr/bin/docker kill %n
 ExecStartPre=-/usr/bin/docker rm %n
 ExecStart=/usr/bin/docker run --name %n \
-  --add-host=mariadb:{{ hostvars[groups['databases'][0]]['ansible_default_ipv4']['address'] }} \
-  -e "KEYSTONE_HOST={{ hostvars[groups['keystone'][0]]['ansible_default_ipv4']['address'] }}" \
+  --add-host=mariadb:{{ hostvars[groups['databases'][0]]['listen_ip'] | default(hostvars[groups['databases'][0]]['ansible_default_ipv4']['address']) }} \
+  -e "KEYSTONE_HOST={{ hostvars[groups['keystone'][0]]['listen_ip'] | default(hostvars[groups['keystone'][0]]['ansible_default_ipv4']['address']) }}" \
   -p 5000:5000 -p 35357:35357 \
   -v /srv/keystone/fernet-keys:/etc/keystone/fernet-keys \
   -v /srv/keystone/root:/root \