Create an L2 template for a MOSK storage node

Note

Modification of L2 templates in use is prohibited in the API to prevent accidental cluster failures due to unsafe changes.

The list of risks posed by modifying L2 templates includes:

• Services running on hosts cannot reconfigure automatically to switch to the new IP addresses and/or interfaces.

• Connections between services are interrupted unexpectedly, which can cause data loss.

• Incorrect configurations on hosts can lead to irrevocable loss of connectivity between services and unexpected cluster partition or disassembly.

According to the reference architecture, MOSK storage nodes in the MOSK cluster must be connected to the following networks:

• PXE network

• LCM network

• Storage access network

• Storage replication network

To create an L2 template for MOSK storage nodes:

1. Add an L2 template to the mosk-l2templates.yml file using the following example. Adjust the values of parameters according to the specification of your environment.

   Example of an L2 template for MOSK storage nodes

   apiVersion: ipam.mirantis.com/v1alpha1
   kind: L2Template
   metadata:
     labels:
       kaas.mirantis.com/provider: baremetal
       kaas.mirantis.com/region: region-one
       cluster.sigs.k8s.io/cluster-name: <MOSKClusterName>
     name: mosk-storage
     namespace: <MOSKClusterNamespace>
   spec:
     autoIfMappingPrio:
     - provision
     - eno
     - ens
     - enp
     clusterRef: <MOSKClusterName>
     l3Layout:
     - subnetName: mgmt-lcm-nw
       scope: global
     - subnetName: k8s-lcm-subnet
       scope: namespace
     - subnetName: k8s-ext-subnet
       scope: namespace
     - subnetName: k8s-pods-subnet
       scope: namespace
     - subnetName: ceph-cluster-subnet
       scope: namespace
     - subnetName: ceph-public-subnet
       scope: namespace
     npTemplate: |-
       version: 2
       ethernets:
         {{nic 0}}:
           dhcp4: false
           dhcp6: false
           match:
             macaddress: {{mac 0}}
           set-name: {{nic 0}}
           mtu: 9000
         {{nic 1}}:
           dhcp4: false
           dhcp6: false
           match:
             macaddress: {{mac 1}}
           set-name: {{nic 1}}
           mtu: 9000
         {{nic 2}}
           dhcp4: false
           dhcp6: false
           match:
             macaddress: {{mac 2}}
           set-name: {{nic 2}}
           mtu: 9000
         {{nic 3}}:
           dhcp4: false
           dhcp6: false
           match:
             macaddress: {{mac 3}}
           set-name: {{nic 3}}
           mtu: 9000
       bonds:
         bond0:
           mtu: 9000
           parameters:
             mode: 802.3ad
           interfaces:
           - {{nic 0}}
           - {{nic 1}}
         bond1:
           mtu: 9000
           parameters:
             mode: 802.3ad
           interfaces:
           - {{nic 2}}
           - {{nic 3}}
       vlans:
         k8s-lcm-v:
           id: 403
           link: bond0
           mtu: 9000
         k8s-ext-v:
           id: 409
           link: bond0
           mtu: 9000
         k8s-pods-v:
           id: 408
           link: bond0
           mtu: 9000
         stor-frontend:
           id: 404
           link: bond0
           mtu: 9000
         stor-backend:
           id: 405
           link: bond1
           mtu: 9000
       bridges:
         k8s-lcm:
           interfaces: [k8s-lcm-v]
           addresses:
           - {{ ip "k8s-lcm:k8s-lcm-subnet" }}
           nameservers:
             addresses: {{nameservers_from_subnet "k8s-lcm-subnet"}}
           routes:
           - to: {{ cidr_from_subnet "mgmt-lcm-nw" }}
             via: {{ gateway_from_subnet "k8s-lcm-subnet" }}
         k8s-ext:
           interfaces: [k8s-ext-v]
           addresses:
           - {{ip "k8s-ext:k8s-ext-subnet"}}
           nameservers:
             addresses: {{nameservers_from_subnet "k8s-ext-subnet"}}
           gateway4: {{ gateway_from_subnet "k8s-ext-subnet" }}
           mtu: 9000
         k8s-pods:
           interfaces: [k8s-pods-v]
           addresses:
           - {{ip "k8s-pods:k8s-pods-subnet"}}
           mtu: 9000
         ceph-public:
           interfaces: [stor-frontend]
           addresses:
           - {{ip "ceph-public:ceph-public-subnet"}}
           mtu: 9000
         ceph-cluster:
           interfaces: [stor-backend]
           addresses:
           - {{ip "ceph-cluster:ceph-cluster-subnet"}}
           mtu: 9000
   

2. Proceed with Edit and apply L2 templates.