Minimal vagrant setup to test k3s.
Use ./up.sh to spawn a k3s cluster composed of 1 server and 3 agents.
Use ./clean.sh to clean things up.
You can adapt the Vagrantfile if you need to change the composition of the
cluster.
The biggest challenge with this setup was virtualbox related.
Using virtualbox, I add two ifaces to each vm:
- A NAT iface used for external connectivity
- A hostnet iface used for node to node and host to node connections
By default k3s and flannel pick the NAT one. Some configuration is needed to:
- tell k3s which IP address it should advertise for the node
- tell flannel which iface should be used to route traffic to others nodes
These configuration options are set in the systemd services (NODE_IP and
--flannel-iface).