Articles in this section

Configuring the VAST Cluster DNS Server

Sara Levy
  • Updated
Follow

VAST Cluster supports a single instance of the DNS service. The DNS server listens for DNS requests on port 53 and runs on a dedicated virtual IP (DNS VIP).

To use the DNS service, you need to configure it and enable the service on the VMS via the VAST Web UI or VAST CLI.

Configuring the VAST Cluster DNS Service via the VAST Web UI

  1. From the left navigation menu, select Network Access and then DNS.

  2. In the Add DNS dialog, complete the fields:

    Field

    Description

    Name (required)

    Enter a name for the DNS server configuration.

    For example: vast-dns

    VIP (required)

    Enter a virtual IP to assign to the DNS service. DNS requests from your external DNS server must be delegated to this IP.

    For example: 192.0.2.0

    VIP Gateway

    If the external DNS server doesn't reside on the same subnet as the DNS VIP, enter the IP of a gateway through which to connect to the DNS server. The gateway IP must be on same subnet as the DNS VIP and reachable from the management network.

    For example: 192.0.4.0

    Domain Suffix

    Specify a domain suffix. Requests for the specified domain suffix are resolved to the VIPs configured on the cluster.

    If domain names are configured per VIP pool, the domain suffix is appended to those domain names to form a valid FQDN for DNS requests to target.

    For example: mycorp.cluster.com

    VIP Subnet CIDR

    The subnet, in CIDR format, on which the DNS VIP resides.

    In CIDR notation, the subnet is expressed as the number of bits of each IP address that represent the subnet address.

    For example, the subnet mask 255.255.0.0 is expressed as 16 in CIDR notation.

    Enter only the trailing CIDR decimal number that indicates the subnet mask. e.g. If the DNS VIP is 192.0.2.3 and the CIDR subnet is 24, enter 24 in this field. Do not enter 192.0.2.3/24.

    VIP VLAN

    If your external DNS server is only exposed to a specific VLAN, you can enter the VLAN here to enable communication with the DNS server. Ensure that VLAN tagging is configured on the MGMT network to which the CNodes are connected. This configuration is not supported through VMS.

    Note

    This VLAN tag is not related to VLAN tagging per VIP pool.

    Valid range: 1 to 4094

  3. If you want to immediately enable the DNS service, turn on the Enabled setting.

  4. Click Create.

    The DNS server configuration is created and appears on the DNS tab.

Configuring the VAST Cluster DNS Service via the VAST CLI

To configure the DNS server from the CLI, use the dns create command.

For example:

vcli: admin> dns create --name vast_dns --vip 192.0.2.0 --domain-suffix vastdata.ourcorp.com --vip-gateway 192.0.4.0--enable --vip-subnet-cidr 16

To display the configuration, run dns show or dns list.

To modify the configuration, run dns modify.

To delete the configuration, run dns delete.

Related articles

Comments

0 comments

Article is closed for comments.