Allow configuring a gateway for the inspection network

This is configured via the ironic_dnsmasq_default_gateway variable, and
is not set by default.

Change-Id: I4deea65876d0852ba2b48a8cf9bad94f4df2a18d

ansible/roles/ironic/defaults/main.yml

@@ -139,6 +139,7 @@ openstack_ironic_inspector_auth: "{{ openstack_auth }}"
 
 ironic_dnsmasq_interface: "{{ api_interface }}"
 ironic_dnsmasq_dhcp_range:
+ironic_dnsmasq_default_gateway:
 ironic_dnsmasq_boot_file: "{% if enable_ironic_ipxe | bool %}undionly.kpxe{% else %}pxelinux.0{% endif %}"
 ironic_cleaning_network:
 ironic_console_serial_speed: "115200n8"

ansible/roles/ironic/templates/ironic-dnsmasq.conf.j2

@@ -1,6 +1,9 @@
 port=0
 interface={{ api_interface }}
 dhcp-range={{ ironic_dnsmasq_dhcp_range }}
+{% if ironic_dnsmasq_default_gateway is not none %}
+dhcp-option=3,{{ ironic_dnsmasq_default_gateway }}
+{% endif %}
 dhcp-option=option:tftp-server,{{ api_interface_address }}
 dhcp-option=option:server-ip-address,{{ api_interface_address }}
 bind-interfaces

doc/source/reference/ironic-guide.rst

@@ -30,6 +30,15 @@ network:
 
 .. end
 
+In the same file, optionally a default gateway to be used for the Ironic
+Inspector inspection network:
+
+.. code-block:: yaml
+
+   ironic_dnsmasq_default_gateway: 192.168.5.1
+
+.. end
+
 In the same file, specify the PXE bootloader file for Ironic Inspector. The
 file is relative to the ``/tftpboot`` directory. The default is ``pxelinux.0``,
 and should be correct for x86 systems. Other platforms may require a different

releasenotes/notes/ironic-dnsmasq-gateway-5a887a0a2f946bd5.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Adds support for configuring a default gateway to be used in the Ironic
+    Inspector inspection network. This is configured via the
+    ``ironic_dnsmasq_default_gateway`` variable, and is not set by default.