Service labels and their life cycle¶

Any Subnet object may contain ipam/SVC-<serviceName> labels. All IP addresses allocated from the Subnet object that has service labels defined inherit those labels.

When a particular IpamHost uses IP addresses allocated from such labeled Subnet objects, the ServiceMap field in IpamHost.Status contains information about which IPs and interfaces correspond to which service labels (that have been set in the Subnet objects). Using ServiceMap, you can understand what IPs and interfaces of a particular host are used for network traffic of a given service.

MOSK uses the following service labels that allow using of the specific subnets for particular MOSK services:

ipam/SVC-k8s-lcm
ipam/SVC-ceph-cluster
ipam/SVC-ceph-public
ipam/SVC-dhcp-range
ipam/SVC-MetalLB ^{Unsupported since 24.3}
ipam/SVC-LBhost

Caution

The use of the ipam/SVC-k8s-lcm label is mandatory for every cluster.

Important

A label value is not mandatory and can be empty but it must match the value in the related L2Template object, in which the corresponding subnet is used. Otherwise, network configuration for related hosts will not be rendered due to not found subnets.

You can also add custom service labels to the Subnet objects the same way you add MOSK service labels. The mapping of IPs and interfaces to the defined services is displayed in IpamHost.Status.ServiceMap.

You can assign multiple service labels to one network. You can also assign the ceph-* and dhcp-range services to multiple networks. In the latter case, the system sorts the IP addresses in the ascending order:

serviceMap:
  ipam/SVC-ceph-cluster:
    - ifName: ceph-br2
      ipAddress: 10.0.10.11
    - ifName: ceph-br1
      ipAddress: 10.0.12.22
  ipam/SVC-ceph-public:
    - ifName: ceph-public
      ipAddress: 10.1.1.15
  ipam/SVC-k8s-lcm:
    - ifName: k8s-lcm
      ipAddress: 10.0.1.52

You can add service labels during creation of subnets as described in Create subnets.

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Service labels and their life cycle¶