k3s on OpenWrt

Makefile to generate OpenWrt .opkg packages from official k3s binaries.

Usage

This requires a custom kernel with support for various cgroup, namespaces, vxlan, cfs scheduler etc. See here for my openwrt config: https://github.com/5pi-home/openwrt/blob/master/config

Firewall

To allow the k3s' flannel bridge to access the internet, configure a interface for cni0 in uci:

/etc/config/network:

config interface 'k8s'
	option proto 'none'
	option ifname 'cni0'

/etc/config/firewall

config zone
        option name 'k8s'
        option input 'ACCEPT'
        option output 'ACCEPT'
        option forward 'ACCEPT'
        option network 'k8s'

Building

Run make to build the default version for x86_64. You can override ARCH and VERSION, e.g make ARCH=armhf. See ARCHS and VERSIONS files for available architectures and versions.

Init

server

Before run k3s as service, set param with type 'server'.

cat > /etc/config/k3s << EOF
config opts 'globals'
   option type 'server'
   option opts '--disable=traefik'
   option root '/var/k3s/data'
EOF

Service inits cluster and sets a new init parameter to '1' in k3s config file.

agent

Before run k3s as service, set param with type 'agent'.

cat > /etc/config/k3s << EOF
config opts 'globals'
   option type 'agent'
   option opts '--token-file /etc/token --server https://<ip or hostname of server1>:6443 --with-node-id'
EOF

Service joins automaticaly the server.

jbsky / k3s-openwrt