![]() Instance-manager-e-437ba600ca8a15720f049790071aac70:/ # ip addr showġ: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 If setting this post-install, the instance-manager pods will restart and attach a new interface: Longhorn has a config setting to define the network used for storage operations: Testing access to a service on curl 172.16.60.31 Inet6 fe80::a870:abff:feb6:7a86/64 scope linkĥ: mtu 1500 qdisc noqueue state UP group default Link/ether aa:70:ab:b6:7a:86 brd ff:ff:ff:ff:ff:ff link-netnsid 0 Inet6 fe80::1857:1aff:fec1:bff3/64 scope linkĤ: mtu 1500 qdisc noqueue state UP group default Link/ether 1a:57:1a:c1:bf:f3 brd ff:ff:ff:ff:ff:ff link-netnsid 0 Which we can validate within the ip addr showģ: mtu 1450 qdisc noqueue state UP group default K8s.v1./networks: multus-network-attachments/macvlan-longhorn-dhcp,multus-network-attachments/macvlan-private-dhcpĬommand: We use an annotation to attach a pod to additional networks Through NetworkAttachmentDefinition objects, we can define the respective networks and bridge them to named, physical interfaces on the host: It provides MAC addresses directly to Pod interfaces which makes it simple to integrate with network services like DHCP. You can also add additional CNI’s if you ls /opt/cni/bin/īandwidth calico dhcp flannel host-local ipvlan macvlan portmap sbr tuning vrfīridge calico-ipam firewall host-device install loopback multus ptp static vlanįor this environment, macvlan will be used. Out of the box, we can query the /opt/cni/bin directory for available plugins. At this point we have a functioning cluster with an overlay network in place for cluster communication, and every Pod will have a interface on that network. Multus is not a CNI in itself, but a meta CNI plugin, enabling the use of multiple CNI’s in a Kubernetes cluster. NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME Tip – Store the desired node-ip in a config file before launching the command on the nodes. With this set, we can extract the join command and run it on our servers: Which is why the specific interface used is defined in both sections. The Canal CNI is a combination of both Calico and Flannel. The section “Add-On Config” enables us to make changes to the various addons for our cluster: We have to have an existing CNI for cluster networking, which is Canal in this example Using Multus is as simple as selecting it from the dropdown list of CNI’s. VLAN60 – Provide access to ancillary services.įor the purposes of experimenting, I will create my VMs first.Īgent VM Config: Rancher Cluster Configuration.Longhorn is a cloud-native distributed block storage solution for Kubernetes. VLAN50 – Used exclusively by Longhorn for replication traffic.VLAN40 – Used for node node communication. ![]() Agent NodesĪgent nodes will be connected to multiple networks: This will reside on VLAN40 in my environment and will act as the overlay/management network for my cluster and will be used for node node communication. In RKE2 vernacular, we refer to nodes that assume etcd and/or control plane roles as servers, and worker nodes as agents. Although more common in bare metal environments, I’ll create a virtualised equivalent. Because of this, I wanted to create a test environment to experiment with this kind of setup. ![]() From my experience, some environments necessitate leveraging multiple NICs on Kubernetes worker nodes as well as the underlying Pods. ![]()
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