k3s

README

Kubernetes

---

Kubernetes without the features I don't care about.

Some of the removed features

• OpenAPI/Swagger
• cloud-controller-manager
• kube aggregation
• APIs (NOTE: most of these are old APIs that have been replaced)
  • admissionregistration/v1alpha1
  • authentication/v1beta1
  • authorization/v1beta1
  • certificates/v1beta1
  • events/v1beta1
  • imagepolicy/v1alpha1
  • rbac/v1alpha1
  • rbac/v1beta1
  • settings/v1alpha1
  • storage/v1alpha1
• Authentication
  • bootstrap token
  • oidc
  • webhook
• Authorization
  • ABAC
• Cloud Providers (all of them)
• Controllers
  • Bootstrap
  • Certificates
  • Cloud
  • Cluster Role Aggregation
  • Cloud based node IPAM
  • Replication
  • Route
• Credential Providers AWS/GCP/Azure/Rancher
• Kubelet
  • Device Plugin
  • Certificates
  • Checkpoint
  • Device Manager
  • Custom Metrics
  • Dockershim
  • GPU
  • Mount Pod
  • Network
    • Hairpin
    • Kubenet
  • rkt
• Volume Drivers
  • aws_ebs
  • azure_dd
  • azure_file
  • cephfs
  • cinder
  • fc
  • flocker
  • gce_pd
  • glusterfs
  • iscsi
  • photon_pd
  • portworx
  • quobyte
  • rbd
  • scaleio
  • storageos
  • vsphere_volume
• Admission Controllers
  • admin
  • alwayspullimages
  • antiaffinity
  • defaulttolerationseconds
  • deny
  • eventratelimit
  • exec
  • extendedresourcetoleration
  • gc
  • imagepolicy
  • initialreosurces
  • limitranger
  • namespace
  • noderestriction
  • persistentvolume
  • podnodeselector
  • podpreset
  • podtolerationrestriction
  • priority
  • resourcequota
  • security
  • securitycontext
  • storageobjectinuseprotection
• etcd (yeah, i'm using sqlite3)

Build

# First have sane GOPATH, hopefully you know how to do that
go build -o k3s
go build -o kubectl ./cmd/kubectl

Run

Run containerd

# Download and install containerd and runc
sudo curl -fL -o /usr/local/bin/runc https://github.com/opencontainers/runc/releases/download/v1.0.0-rc5/runc.amd64
sudo chmod +x /usr/local/bin/runc

curl -fsL https://github.com/containerd/containerd/releases/download/v1.1.1/containerd-1.1.1.linux-amd64.tar.gz | sudo tar xvf /usr/src/containerd.tgz -C /usr/local/bin bin/ --strip-components=1

# Some CNI
sudo mkdir -p /opt/cni/bin
curl -fsL https://github.com/containernetworking/plugins/releases/download/v0.7.1/cni-plugins-amd64-v0.7.1.tgz  | sudo tar xvzf - -C /opt/cni/bin ./loopback

sudo containerd &

Run Kubernetes

# Server
./k3s

# Agent (If doing this on another host copy the ./data folder)
sudo ./k3s agent

# Install Networking
export KUBECONFIG=./data/cred/kubeconfig.yaml
curl -s "https://cloud.weave.works/k8s/net?k8s-version=$(./kubectl version | base64 | tr -d '\n')" | sed 's!rbac.authorization.k8s.io/v1beta1!rbac.authorization.k8s.io/v1!g' | ./kubectl apply -f -

Your kubeconfig file is in ./data/cred/kubeconfig.yaml

Enjoy.