makedns.8

NAME

makedns - sets up domain name services (DNS).

SYNOPSIS

makedns [-h | --help]

makedns [-V | --verbose] [-e | --external] [-n | --new] [noderange]

makedns [-V | --verbose] [-e | --external] [-d | --delete noderange]

DESCRIPTION

makedns configures a DNS server on the system you run it on, which is typically the xCAT management node.

The list of nodes to include comes from either the noderange provided on the command line or the entries in the local /etc/hosts files.

There are several bits of information that must be included in the xCAT database before running this command.

You must set the forwarders attributes in the xCAT site definition.

The forwarders value should be set to the IP address of one or more nameservers at your site that can resolve names outside of your cluster. With this set up, all nodes ask the local nameserver to resolve names, and if it is a name that the MN DNS does not know about, it will try the forwarder names.

An xCAT network definition must be defined for each network used in the cluster. The net and mask attributes will be used by the makedns command.

A network domain and nameservers values must be provided either in the network definition corresponding to the node or in the site definition.

Only entries in /etc/hosts or the hosts specified by noderange that have a corresponding xCAT network definition will be added to DNS.

By default, makedns sets up the named service and updates the DNS records on the local system (management node). If the -e flag is specified, it will also update the DNS records on any external DNS server that is listed in the /etc/resolv.conf on the management node. (Assuming the external DNS server can recognize the xCAT key as authentication.)

For more information on Cluster Name Resolution see https://xcat-docs.readthedocs.io/en/stable/advanced/domain_name_resolution/domain_name_resolution.html

OPTIONS

-V | --verbose

Verbose mode.

-n | --new

Use this flag to create new named configuration and db files.

-d | --delete

Remove the DNS records.

-e | --external

Update DNS records to the external DNS server listed in /etc/resolv.conf.

Enabling the site attribute externaldns means use ‘external’ DNS by default. If setting externaldns to 1, you need NOT use -e flag in every makedns call.

noderange

A set of comma delimited node names and/or group names. See the “noderange” man page for details on additional supported formats.

Examples

To set up DNS for all the hosts in /etc/hosts file.

makedns

To set up DNS for node1.

makedns node1

To create a new named configuration and db files for all hosts in /etc/hosts.

makedns -n

To delete the DNS records for node1.

makedns -d node1