Vagrant

This directory contains the configuration for the virtual machines we will use for the installation.

A few prerequisites are handled by the VM provisioning steps.

Kernel Settings

Disable cgroups v2. I found that Kubernetes currently doesn't play nice with cgroups v2, therefore we need to set a kernel boot parameter in grub to switch back to v1.
Install the br_netfilter kernel module that permits kube-proxy to manipulate IP tables rules
Add the two tunables net.bridge.bridge-nf-call-iptables=1 and net.ipv4.ip_forward=1 also required for successful pod networking.

DNS settings

Set the default DNS server to be Google, as we know this always works.
Set up /etc/hosts so that all the VMs can resolve each other

Other settings

Install configs for vim and tmux on master-1