Add inventory_dns feature to bifrost

This will allow to configure addressing based on inventory

Change-Id: I71517146a197e39ed8ff2205e4234685d95331ad

doc/source/deploy/dhcp.rst

@@ -66,3 +66,15 @@ You can set up a static DHCP reservation using the ``ipv4_address`` parameter
 and setting the ``inventory_dhcp`` setting to a value of ``true``.  This will
 result in the first MAC address defined in the list of hardware MAC addresses
 to receive a static address assignment in dnsmasq.
+
+======================================
+Forcing DNS to resolve to ipv4_address
+======================================
+
+dnsmasq will resolve all entries to the IP assigned to each server in
+the leases file. However, this IP will not always be the desired one, if you
+are working with multiple networks.
+To force DNS to always resolve to ``ipv4_address`` please set the
+``inventory_dns`` setting to a value of ``true``. This will result in each
+server to resolve to ``ipv4_address`` by explicitly using address capabilities
+of dnsmasq.

playbooks/roles/bifrost-deploy-nodes-dynamic/README.md

@@ -56,7 +56,6 @@ instance_info: A dictionary containing the information to define an instance.
                expected are image_source, image_checksum, root_gb, however,
                any supported key/value can be submitted to the API.
 
-
 inventory_dhcp: A boolean value, defaulted to false, which allows dnsmasq
                 to configure the IP of the machines, rather than putting
                 the IP configuration of the machine in the config drive.
@@ -85,6 +84,12 @@ noauth_mode: Controls if the module is called in noauth mode.
              which expects a clouds.yml file.  More information about
              this file format can be found at:
              http://docs.openstack.org/developer/os-client-config/
+
+inventory_dns: A boolean value, defaulted to false, which causes the role
+                to update a template file and reload dnsmasq upon each update
+                in order to perform static dns addressing utilizing the
+                ipv4_address parameter.
+
 Dependencies
 ------------
 

playbooks/roles/bifrost-deploy-nodes-dynamic/defaults/main.yml

@@ -9,5 +9,6 @@ deploy_image_filename: "deployment_image.qcow2"
 deploy_image: "{{http_boot_folder}}/{{deploy_image_filename}}"
 inventory_dhcp: false
 inventory_dhcp_static_ip: true
+inventory_dns: false
 deploy_url_protocol: "http"
 noauth_mode: true

playbooks/roles/bifrost-deploy-nodes-dynamic/tasks/main.yml

@@ -27,13 +27,18 @@
   delegate_to: localhost
   when: inventory_dhcp | bool
   become: yes
+- name: "Setup DNS address for nodes."
+  template: src=dns-address.j2 dest=/etc/dnsmasq.d/host_record_{{ inventory_hostname }} owner=root group=root mode=0644
+  delegate_to: localhost
+  when: inventory_dns | bool
+  become: yes
 - name: "Sending dnsmasq HUP"
   # Note(TheJulia): We need to actually to send a hup signal directly as
   # Ansible's reloaded state does not pass through to the init script.
   command: killall -HUP dnsmasq
   become: yes
-  when: inventory_dhcp | bool
+  when: (inventory_dhcp | bool) or (inventory_dns | bool)
-- name: "Deploy to hardware - Using custom instance_info"
+- name: "Deploy to hardware - Using custom instance_info."
   os_ironic_node:
     auth_type: "{{ auth_type | default(omit) }}"
     auth: "{{ auth | default(omit) }}"

playbooks/roles/bifrost-deploy-nodes-dynamic/templates/dns-address.j2

@@ -0,0 +1,2 @@
+# This file is managed by bifrost
+host-record={{ inventory_hostname }},{{ ipv4_address }}

playbooks/roles/bifrost-ironic-install/README.md

@@ -77,6 +77,9 @@ In the case of static inventory, please also consider to set the
 ``dhcp_lease_time`` setting to infinite, to avoid unnecessary refreshes
 of ips.
 
+If you want to force all hostnames to resolve to ``ipv4_address`` set on
+the inventory, please set the ``inventory_dns`` setting to ``true``.
+
 In case your HW needs a kernel option to boot, set the following variable:
 
 extra_kernel_options: Default undefined.

playbooks/roles/bifrost-ironic-install/defaults/main.yml

@@ -86,6 +86,10 @@ enable_cors_credential_support: false
 # hosts in your dynamic inventory.
 inventory_dhcp: False
 
+# Set this to true to configure dnsmasq to resolv to ipv4_address from the
+# hosts in your dynamic inventory.
+inventory_dns: False
+
 # Settings to enable the use of inspector
 enable_inspector: false
 inspector_auth: "noauth"

playbooks/roles/bifrost-ironic-install/templates/dnsmasq.conf.j2

@@ -119,6 +119,10 @@ interface={{ network_interface }}
 # running another nameserver on the same machine.
 bind-interfaces
 
+# Include another lot of configuration options.
+#conf-file=/etc/dnsmasq.more.conf
+conf-dir=/etc/dnsmasq.d
+
 # If you don't want dnsmasq to read /etc/hosts, uncomment the
 # following line.
 #no-hosts
@@ -653,10 +657,6 @@ dhcp-boot=http://{{ hostvars[inventory_hostname]['ansible_' + ans_network_interf
 # Log lots of extra information about DHCP transactions.
 #log-dhcp
 
-# Include another lot of configuration options.
-#conf-file=/etc/dnsmasq.more.conf
-#conf-dir=/etc/dnsmasq.d
-
 {% if testing %}
 log-queries
 log-dhcp

releasenotes/notes/inventory_dns-921195abbc5e65ef.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - Adds new feature to manage DNS with the settings
+    on the inventory. When ``inventory_dns`` setting is
+    True, it will populate a set of record-host entries,
+    for each of the hostnames present on the inventory,
+    matching the ``ipv4_address``.  This will override
+    the default dnsmasq behaviour, that will associate
+    hostnames with IP present on the leases file.