Bare metal, self-hosted, self-healing/provisioning, mesh network kubernetes cluster

kubermesh

Goal

1. Deploy to one machine. Say, boot off a USB hard drive.
2. Plug other machines into the first one. Watch them boot and join the cluster.
3. Keep going till you run out of machines.

No need for a traditional network with switches.

Easy replacement, just drop new machines in. And the same goes for adding capacity

This repo is a prototype trying to achieve the above concepts. For more about the project, see the blog post

Local dev prerequisites

sudo apt-get install qemu-kvm libvirt-bin docker virtinst

Getting started

./deploy libvirt 4

This will set up 4 nodes using libvirt, and run the bootstrap process

Usernames/Passwords are currently hardcoded to core/core

Useful commands

virt-viewer kubermesh1 - to get a graphical console virsh console kubermesh1 - to get a serial console

Cleaning up

./teardown

Current address allocations

Anycast addresses:

• apiserver: fd65:7b9c:569:680:98eb:c508:eb8c:1b80
• etcd: fd65:7b9c:569:680:98eb:c508:ea6b:b0b2
• docker hub mirror: [fd65:7b9c:569:680:98e8:1762:7b6e:83f6]:5000
• gcr.io mirror: [fd65:7b9c:569:680:98e8:1762:7b6e:61d3]:5002
• quay.io mirror: [fd65:7b9c:569:680:98e8:1762:7abd:e0b7]:5001

libvirt networking:

• host <-> gateway: 172.30.0.1/30
• host <-> gateway: 2001:db8:a001::1/64
• gateway <-> kubermesh1: 172.30.0.9/29
• gateway <-> kubermesh1: 2001:db8:a002::10/126
• gateway docker: 172.30.1.1/24
• flannel ipv4: 172.31.0.0/16
• custom ipv4 allocation: 172.30.2.0/24
• custom ipv6 allocation: 2001:db8::/71

Installation networking:

• ??::0/119
• host: ::0/123
• host vip: ::0/128
• mesh interfaces: ::10/123
• mesh interface 1: ::10/126
• mesh interface 2: ::14/126
• mesh interface 3: ::18/126
• mesh interface 4: ::1c/126
• pods: ::100/120

Hardware specific

NUCs

• Disable legacy network boot in the bios, so it will use EFI boot over ipv6
  • Enter the BIOS
  • Select Advanced under Boot Order
  • Under Legacy Boot Priority disable Legacy Boot
  • Under Boot Configuration select Boot Network Devices Last
  • Under Boot Configuration select Unlimited Boot to Network Attempts
  • Under Boot Configuration check Network Boot is set to UEFI PXE & iSCSI
  • F10

USB Devices for the gateway bootstrapping physical hardware

• Plug USB3 ones into a USB2 port, so qemu can use it without Speed Mismatch errors
• Might need to add /run/udev/data/** r, to /etc/apparmor.d/abstractions/libvirt-qemu until qemu fixes that bug