Fix container hostname for RFC 1034/1035

In lxc-container create this update will ensure we're using good
hostnames. This is required in some logging cases as well as SSL.
This will also allow a deployer to customize the domain name based on
their needs.

A new variable has been created called ``lxc_container_domain`` with a
default value of "openstack.local". This change has no upgrade impact as
any changes that need to happen within an existing environment will be
automatically taken care of without impacting the functionality of an
existing deployment.

This is largely based on Ib31a48dd480ecb376a6a8c5b35b09dfa5d2e58f6, with
the intent being to move the tasks from a playbook in the integrated
repo to the lxc_container_create role, and with the addition of limiting
127.0.0.1 to localhost within /etc/hosts.

Change-Id: I9e72699354a467478742281cab74690e66b6a652
Co-Authored-By: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -31,6 +31,8 @@ lxc_container_vg_name: lxc
 
 lxc_container_default_mtu: "1500"
 
+lxc_container_domain: "openstack.local"
+
 # LXC image server
 lxc_image_cache_server: images.linuxcontainers.org
 

releasenotes/notes/RFC-1034-and-1035-container-update-6e880e4b45e11cf0.yaml

@@ -0,0 +1,15 @@
+---
+features:
+  - LXC containers will now have a proper RFC1034/5 hostname set during post
+    build tasks. A localhost entry for 127.0.1.1 will be created by converting
+    all of the "_" in the ``inventory_hostname`` to "-". Containers will be
+    created with a default domain of *openstack.local*.
+    This domain name can be customized to meet your deployment needs by
+    setting the option ``lxc_container_domain``.
+upgrade:
+  - LXC containers will now have a proper RFC1034/5 hostname set during post
+    build tasks. A localhost entry for 127.0.1.1 will be created by converting
+    all of the "_" in the ``inventory_hostname`` to "-". Containers will be
+    created with a default domain of *openstack.local*.
+    This domain name can be customized to meet your deployment needs by
+    setting the option ``lxc_container_domain``.

tasks/container_create.yml

@@ -190,3 +190,44 @@
     - global_environment_variables is defined
   tags:
     - lxc-container-proxy
+
+- name: Create localhost config
+  lineinfile:
+    dest: "/etc/hosts"
+    regexp: "^127.0.0.1"
+    line: "127.0.0.1 localhost"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+  remote_user: root
+  tags:
+    - lxc-container-hostname
+
+- name: Create domain config
+  lineinfile:
+    dest: "/etc/hosts"
+    regexp: "^127.0.1.1"
+    line: "127.0.1.1 {{ inventory_hostname | replace('_', '-') }}.{{ lxc_container_domain }} {{ inventory_hostname | replace('_', '-') }}"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+  remote_user: root
+  tags:
+    - lxc-container-hostname
+
+- name: Create hostname
+  copy:
+    dest: "/etc/hostname"
+    content: "{{ inventory_hostname | replace('_', '-') }}"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+  remote_user: root
+  tags:
+    - lxc-container-hostname
+
+- name: Setup hostname
+  command: hostname -F /etc/hostname
+  remote_user: root
+  tags:
+    - lxc-container-hostname