fb_network_scripts: add ability to configure system wide static defau…

…lt gateway

Summary:

Add ability to configure system wide static default gateway
And remove incorrect comment

Differential Revision: D51118754

fbshipit-source-id: 15e533972e90282bb515a4634bf53f208c0bf2f4

cookbooks/fb_network_scripts/README.md

@@ -53,6 +53,9 @@ Controls whether to manage packages for `network-scripts`; defaults to `true`.
 Controls pause frame settings of the primary interface. Keys correspond to
 parameters of `ethtool -a/-A`, values: `nil` (don't care), `true`, `false`.
 
+#### `node['fb_network_scripts']['v6_default_gw']`
+Sets IPV6_DEFAULTGW in /etc/sysconfig/network.  Defaults to `nil`
+
 ### Interface Configs
 This cookbook also provides interface configuration:
 

cookbooks/fb_network_scripts/attributes/default.rb

@@ -60,6 +60,7 @@
   'enable_tun' => false,
   'enable_bridge_filter' => false,
   'linkdelay' => 0,
+  'v6_default_gw' => nil,
 
   # Internal attributes, do not use
   '_rerun_ifup_local' => false,

cookbooks/fb_network_scripts/templates/default/network.erb

@@ -1,9 +1,11 @@
 # This file is maintained by Chef. Do not edit, all changes will be
 # overwritten. See fb_network_scripts/README.md
 
-# Note that we don't set GATEWAY in here because ifup-local will do it
 NETWORKING=yes
 HOSTNAME=<%= node['fqdn'] %>
 LINKDELAY=<%= node['fb_network_scripts']['linkdelay'] %>
 NETWORKING_IPV6=yes
 IFDOWN_ON_SHUTDOWN=no
+<% if node['fb_network_scripts']['v6_default_gw'] %>
+IPV6_DEFAULTGW="<%= node['fb_network_scripts']['v6_default_gw'] %>"
+<% end %>