# Hardware Typhoon ensures certain networking hardware integrates well with bare-metal Kubernetes. ## Ubiquiti Ubiquiti EdgeRouters and EdgeOS work well with bare-metal Kubernetes clusters. Familiarity with EdgeRouter setup and CLI usage is required. ### PXE Ubiquiti EdgeRouters can provide a PXE-enabled network boot environment for client machines. #### ISC DHCP With ISC DHCP, add a subnet parameter to the LAN DHCP server to include an ISC DHCP config file. ``` configure show service dhcp-server shared-network-name NAME subnet SUBNET set service dhcp-server shared-network-name NAME subnet SUBNET subnet-parameters "include "/config/scripts/ipxe.conf";" commit-confirm ``` Switch to root (i.e. `sudo -i`) and write the ISC DHCP config `/config/scripts/ipxe.conf`. iPXE client machines will chainload to `matchbox.example.com`, while non-iPXE clients will chainload to `undionly.kpxe` (requires TFTP). ``` allow bootp; allow booting; next-server ADD_ROUTER_IP_HERE; if exists user-class and option user-class = "iPXE" { filename "http://matchbox.example.com/boot.ipxe"; } else { filename "undionly.kpxe"; } ``` #### dnsmasq With dnsmasq for DHCP, add options to chainload PXE clients to iPXE `undionly.kpxe` (requires TFTP), tag iPXE clients, and chainload iPXE clients to `matchbox.example.com`. ``` set service dns forwarding options 'dhcp-userclass=set:ipxe,iPXE' set service dns forwarding options 'pxe-service=tag:#ipxe,x86PC,PXE chainload to iPXE,undionly.kpxe' set service dns forwarding options 'pxe-service=tag:ipxe,x86PC,iPXE,http://matchbox.example.com/boot.ipxe' ``` ### TFTP Use `dnsmasq` as a TFTP server to serve `undionly.kpxe`. Compiling from [source](https://github.com/ipxe/ipxe) with TLS support is strongly recommended. If you use a [pre-compiled](http://boot.ipxe.org/undionly.kpxe) copy, you must set `download_protocol = "http"` in your cluster definition (discouraged). ``` sudo -i mkdir /config/tftpboot && cd /config/tftpboot curl http://boot.ipxe.org/undionly.kpxe -o undionly.kpxe ``` Add `dnsmasq` command line options to enable the TFTP file server. ``` configure show service dns forwarding set service dns forwarding options enable-tftp set service dns forwarding options tftp-root=/config/tftpboot commit-confirm ``` ### DHCP Assign static IPs to clients with known MAC addresses. This is called a static mapping by EdgeOS. Configure the router with the commands based on region inventory. ``` configure show service dhcp-server shared-network set service dhcp-server shared-network-name LAN subnet SUBNET static-mapping NAME mac-address MACADDR set service dhcp-server shared-network-name LAN subnet SUBNET static-mapping NAME ip-address 10.0.0.20 ``` ### DNS Assign DNS A records to nodes as options to `dnsmasq`. ``` configure set service dns forwarding options host-record=node.example.com,10.0.0.20 ``` Restart `dnsmasq`. ``` sudo /etc/init.d/dnsmasq restart ``` Configure queries for `*.svc.cluster.local` to be forwarded to the Kubernetes `coredns` service IP to allow hosts to resolve cluster-local Kubernetes names. ``` configure show service dns forwarding set service dns forwarding options server=/svc.cluster.local/10.3.0.10 commit-confirm ``` ### Kubernetes Services Add static routes for the Kubernetes IPv4 service range to Kubernetes node(s) so hosts can route to Kubernetes services (default: 10.3.0.0/16). ``` configure show protocols static route set protocols static route 10.3.0.0/16 next-hop NODE_IP ... commit-confirm ``` !!! note Adding multiple next-hop nodes provides equal-cost multi-path (ECMP) routing. EdgeOS v2.0+ is required. The kernel in prior versions used flow-hash to balanced packets, whereas with v2.0, round-robin sessions are used. ### Port Forwarding Expose the [Ingress Controller](/addons/ingress.md#bare-metal) by adding `port-forward` rules that DNAT a port on the router's WAN interface to an internal IP and port. By convention, a public Ingress controller is assigned a fixed service IP (e.g. 10.3.0.12). ``` configure set port-forward wan-interface eth0 set port-forward lan-interface eth1 set port-forward auto-firewall enable set port-forward hairpin-nat enable set port-forward rule 1 description 'ingress http' set port-forward rule 1 forward-to address 10.3.0.12 set port-forward rule 1 forward-to port 80 set port-forward rule 1 original-port 80 set port-forward rule 1 protocol tcp_udp set port-forward rule 2 description 'ingress https' set port-forward rule 2 forward-to address 10.3.0.12 set port-forward rule 2 forward-to port 443 set port-forward rule 2 original-port 443 set port-forward rule 2 protocol tcp_udp commit-confirm ``` ### Web UI The web UI is often accessible from the LAN on ports 80/443 by default. Edit the ports to 8080 and 4443 to avoid a conflict. ``` configure show service gui set service gui http-port 8080 set service gui https-port 4443 commit-confirm ``` ### BGP Add the EdgeRouter as a global BGP peer for nodes in a Kubernetes cluster (requires Calico). Neighbors will exchange `podCIDR` routes and individual pods will become routable on the LAN. Configure node(s) as BGP neighbors. ``` show protocols bgp 1 set protocols bgp 1 parameters router-id LAN_IP set protocols bgp 1 neighbor NODE1_IP remote-as 64512 set protocols bgp 1 neighbor NODE2_IP remote-as 64512 set protocols bgp 1 neighbor NODE3_IP remote-as 64512 ``` View the neighbors and exchanged routes. ``` show ip bgp neighbors show ip route bgp ``` Be sure to register the peer by creating a Calico `BGPPeer` CRD with `kubectl apply`. ``` apiVersion: crd.projectcalico.org/v1 kind: BGPPeer metadata: name: NAME spec: peerIP: LAN_IP asNumber: 64512 ```