Warning
This feature is available starting from the MCP 2019.2.3 maintenance update. Before enabling the feature, follow the steps described in Apply maintenance updates.
When a network uses the default DNS mode,
the DNS requests to a VM are forwarded to the namespaces
defined in /etc/resolv.conf on a dedicated OpenStack compute node.
Using the resolv_conf_file option, you can
specify a file that contains a list of DNS nameserver that
contrail-vrouter-agent will use as a non-default source of custom
nameservers. This option must contain an absolute path
to a custom nameserver file. This file must have the same structure as
/etc/resolv.conf with appropriate permissions.
To override the default DNS server list for vRouter:
Log in to any OpenStack compute node.
In /etc/contrail/contrail-vrouter-agent.conf,
uncomment resolv_conf_file = and add an absolute path to your
custom nameserver file:
[DNS]
resolv_conf_file=<absolute_path_to_custom_nameserver_file>
Restart contrail-vrouter-agent:
service contrail-vrouter-agent restart
Wait until contrail-vrouter-agent is up and running.
To verify the service status, refer to Verify the OpenContrail status.
Repeat the steps 2-4 on the remaining cmp nodes.