Network Services Configuration Module

The initial version of the Network Services configuration module implements DNS clients and servers, with syslog, NTP, and SNMP planned for future releases.

DNS Support

netlab can configure DNS clients or servers on these platforms:

Device	IPv4 DNS client	IPv6 DNS client	Transport VRF	DNS server
Arista EOS	✅	✅	✅	❌
BIRD	✅	✅	❌	❌
Cisco IOS[*1]	✅	✅	✅	❌
Cisco IOS XR[*2]	✅	✅	❌	❌
Cisco Nexus OS	✅	✅	✅	❌
dnsmasq	✅	✅	❌	✅
FRRouting (containers)	✅	✅	❌	❌
Junos[*3]	✅	✅	❌	❌
KinD cluster	✅	✅	❌	❌
Linux (containers)	✅	✅	❌	❌
Nokia SR Linux	✅	✅	❌	❌

[*1]

Includes Cisco Catalyst 8000v, Cisco CSR 1000v, Cisco IOL, Cisco IOL layer-2 image, Cisco IOSv, Cisco IOSv layer-2 image

[*2]

Includes Cisco 8000v, Cisco IOS XRv/XRd

[*3]

Includes Juniper vJunos-router, vJunos Switch, Juniper vMX container, Juniper vPTX, Juniper vSRX 3.0

DNS Parameters

You can configure the DNS client with the global/node services.dns dictionary:

• services.dns.domain (string): The lab domain (default: netlab.local)

• services.dns.server (node name or list of node names): Specifies the DNS server(s) node name. The node name(s) are resolved to IPv4/IPv6 addresses, which are then used to configure the lab devices.

• services.dns.ipv4 and services.dns.ipv6 (address or list of addresses): Hard-coded IPv4/IPv6 DNS server addresses.

• services.dns.transport_vrf: the VRF used to reach the DNS server.

Warning

Configuring module: [ services ] and services.dns.server at the lab topology level is not enough to run DNS clients on all host nodes. The hosts do not inherit topology-level modules; you have to configure the services module on hosts (preferably within a group).

The DNS server is configured with the services.server.dns parameter, which can be a boolean value or a dictionary with these parameters:

• forwarder.ipv4 and forwarder.ipv6 (address or list of addresses): upstream DNS servers used for name resolution of domains other than services.dns.domain.