[DeepDive] Kubernetes on Unraid (Slackware) + OpenFaaS

[0xdevalias]

Concept

It would be cool to be able to run Kubernetes easily on top of Unraid, which appears to be built on Slackware.

tl;dr

• Enable VM support on unraid
• Install kubectl
• Set/persist minikube's MINIKUBE_HOME ENV var to a drive location that will persist on reboot (eg. /mnt/cache/foo)
  • export MINIKUBE_HOME=/mnt/cache/minikube
• Install minikube
  • curl -Lo minikube https://storage.googleapis.com/minikube/releases/v1.1.1/minikube-linux-amd64 && chmod +x minikube && sudo cp minikube /usr/local/bin/ && rm minikube
  • this would be even better if it was wrapped up as an unraid plugin..
• Install docker-machine-driver-kvm2
  • curl -Lo docker-machine-driver-kvm2 https://storage.googleapis.com/minikube/releases/v1.1.1/docker-machine-driver-kvm2 && chmod +x docker-machine-driver-kvm2 && sudo cp docker-machine-driver-kvm2 /usr/local/bin/ && rm docker-machine-driver-kvm2
  • this would be even better if it was wrapped up as an unraid plugin..
• Set minikube's default driver to KVM2
  • minikube config set vm-driver kvm2
• Start minikube
  • minikube start or minikube start -p foo
• ???
• Profit!

Research

Unraid

VMs

• http://unraid.local/Settings/VMSettings
  • Enable VMs: Yes
  • Libvirt storage location: /mnt/cache/libvirt/libvirt.img
  • Default VM storage path: /mnt/cache/VMs/
  • Default ISO storage path:: /mnt/user/Foo/
• http://unraid.local/VMs
  • Add VM: http://unraid.local/VMs/VMTemplates
  • https://forums.unraid.net/forum/45-vm-templates/
  • https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_getting_started_guide/sect-domain_xml_intro
• https://lime-technology.com/wp/virtualization-host/
  • https://forums.unraid.net/topic/37013-a-brief-synopsis-of-kvm-hvm-and-vfio/
• https://forums.unraid.net/forum/51-vm-engine-kvm/
• https://wiki.unraid.net/UnRAID_6/VM_Management
  • KVM, QEMU, VirtIO, VirtFS, VFIO, Libvirt
• https://serverfault.com/questions/324281/how-do-you-increase-a-kvm-guests-disk-space

Plugins

• https://forums.unraid.net/topic/74396-creating-new-plugin/
  • https://forums.unraid.net/topic/52623-plugin-system-documentation/
  • https://forums.unraid.net/topic/33322-how-does-the-plugin-system-work-documentation-added-wip/
  • https://forums.unraid.net/topic/42808-plugin-templates-for-ca-appstore/
  • https://forums.unraid.net/topic/38431-plug-in-application-template-categorizer/
  • https://forums.unraid.net/forum/61-plugin-support/
• https://wiki.unraid.net/UnRAID_Plugins_for_V6

Kubernetes

• https://kubernetes.io/
  • https://kubernetes.io/docs/setup/
• https://github.com/kubernetes/minikube
  • https://github.com/kubernetes/minikube/releases
  • https://kubernetes.io/docs/setup/learning-environment/minikube/
  • https://kubernetes.io/docs/tasks/tools/install-minikube/
    • https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl-on-linux
  • https://github.com/kubernetes/minikube/blob/master/docs/drivers.md#kvm2-driver
    • minikube config set vm-driver kvm2
    • minikube start --vm-driver kvm2
  • https://github.com/kubernetes/minikube/blob/master/docs/env_vars.md#other-variables
    • MINIKUBE_HOME

OpenFaaS

• https://www.openfaas.com/
  • https://www.openfaas.com/blog/introducing-openfaas-for-lambda/
  • https://www.openfaas.com/blog/openfaas-cloudrun/
• https://docs.openfaas.com/
• https://github.com/openfaas
  • https://github.com/openfaas/faas
  • https://github.com/openfaas/faas-cli
  • https://github.com/openfaas/faas-netes
  • https://github.com/openfaas/openfaas-cloud
  • https://github.com/openfaas/store
  • https://github.com/openfaas/workshop
• https://github.com/openfaas-incubator
  • https://github.com/openfaas-incubator/ofc-bootstrap
  • https://github.com/openfaas-incubator/connector-sdk
• https://github.com/faas-and-furious

Slackware

• Slackware's package management tools include:
  • installpkg
  • removepkg
  • upgradepkg
  • etc
• https://slackbuilds.org/repository/14.2/misc/deb2tgz/
  • Shell script that converts Debian packages to Slackware packages.

[jess-sys]

Working with version 1.18.1 instead of 1.1.1.

Consider adding a dedicated user:

• useradd -m -d /mnt/user/system/kube kube
• usermod -a -G users kube
• su kube
• export PATH=.:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin
• minikube start

[BoKKeR]

I would expect this to use all cores and all ram, making it unusable when using VM-s