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K8s Local setup (with 2 more different machines)

Notes

I enjoyed using kind, but since I have 2 Macbooks at home (one is my personal computer, the other is sort of another personal/work computer), so why not trying to set up with kubeadm

Setup

With kubeadm

Since I'm using Mac, I will use multipass to set up kubernetes cluster on bare metal. Way cooler 🎉

Firs thing first, make sure 2 computers are connecting to the same LAN. Set up bridge network for multipass:

$ multipass networks # list all network interface
# figure out what is the network interface
$ multipass set local.bridged-network=en0 # the LAN interface name

Start multipass with 2 CPUs, 2GB RAM and 10 GB disk storage. Make sure to enable the bridge network connection.

Connect to the shell

$ multipass shell <vm-name>

Do installation in the VMs:

$ wget -O - https://raw.githubusercontent.com/andrew-the-drawer/k8s-local/refs/heads/main/kubeadm/prepare.sh | bash

Please note down the VM public IP address in multipass GUI, then run the setup for master node

$ export MASTER_IP=<public-ip-of-VM>
$ wget -O - https://raw.githubusercontent.com/andrew-the-drawer/k8s-local/refs/heads/main/kubeadm/master.sh | bash

The output after running master.sh script in master VM will contain a kubeadm join script. Copy and run that in the worker VM (in another computer).

kubeadm join <master-ip>:6443 --token ... --discovery-token-ca-cert-hash ...

To access the cluster using kubectl, let's do the following. In the Macbook containing master VM

$ multipass transfer <vm-name>:/home/ubuntu/.kube/config ~/.kube/config-local

Use the ~/.kube/config-local config to connect to the cluster from anywhere in the same LAN

Check new kube-flannel

# curl from flannel-io release the latest kube-flannel template, output to kubeadm/kube-flannel.yml

$ curl -o kubeadm/kube-flannel.yml https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

Find the container kube-flannel in the DaemonSet config and add the --iface=enp0s2 to the args options