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vcluster - Virtual Clusters For Kubernetes
- Lightweight & Low-Overhead - Based on k3s, bundled in a single pod and with super-low resource consumption
- No Performance Degradation - Pod are scheduled in the underlying host cluster, so they get no performance hit at all while running
- Reduced Overhead On Host Cluster - Split up large multi-tenant clusters into smaller vcluster to reduce complexity and increase scalability
- Flexible & Easy Provisioning - Create via vcluster CLI, helm, kubectl, Argo any of your favorite tools (it is basically just a StatefulSet)
- No Admin Privileges Required - If you can deploy a web app to a Kubernetes namespace, you will be able to deploy a vcluster as well
- Single Namespace Encapsulation - Every vcluster and all of its workloads are inside a single namespace of the underlying host cluster
- Easy Cleanup - Delete the host namespace and the vcluster plus all of its workloads will be gone immediately
Learn more on www.vcluster.com.
Architecture
Learn more in the documentation.
Quick Start
To learn more about vcluster, open the full getting started guide.
1. Download vcluster CLI
Use one of the following commands to download the vcluster CLI binary from GitHub:
Mac (Intel/AMD)
curl -s -L "https://github.com/loft-sh/vcluster/releases/latest" | sed -nE 's!.*"([^"]*vcluster-darwin-amd64)".*!https://github.com\1!p' | xargs -n 1 curl -L -o vcluster && chmod +x vcluster;
sudo mv vcluster /usr/local/bin;Mac (Silicon/ARM)
curl -s -L "https://github.com/loft-sh/vcluster/releases/latest" | sed -nE 's!.*"([^"]*vcluster-darwin-arm64)".*!https://github.com\1!p' | xargs -n 1 curl -L -o vcluster && chmod +x vcluster;
sudo mv vcluster /usr/local/bin;Linux (AMD)
curl -s -L "https://github.com/loft-sh/vcluster/releases/latest" | sed -nE 's!.*"([^"]*vcluster-linux-amd64)".*!https://github.com\1!p' | xargs -n 1 curl -L -o vcluster && chmod +x vcluster;
sudo mv vcluster /usr/local/bin;Linux (ARM)
curl -s -L "https://github.com/loft-sh/vcluster/releases/latest" | sed -nE 's!.*"([^"]*vcluster-linux-arm64)".*!https://github.com\1!p' | xargs -n 1 curl -L -o vcluster && chmod +x vcluster;
sudo mv vcluster /usr/local/bin;Windows (Powershell)
md -Force "$Env:APPDATA\vcluster"; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]'Tls,Tls11,Tls12';
Invoke-WebRequest -UseBasicParsing ((Invoke-WebRequest -URI "https://github.com/loft-sh/vcluster/releases/latest" -UseBasicParsing).Content -replace "(?ms).*`"([^`"]*vcluster-windows-amd64.exe)`".*","https://github.com/`$1") -o $Env:APPDATA\vcluster\vcluster.exe;
$env:Path += ";" + $Env:APPDATA + "\vcluster";
[Environment]::SetEnvironmentVariable("Path", $env:Path, [System.EnvironmentVariableTarget]::User);If you get the error that Windows cannot find vcluster after installing it, you will need to restart your computer, so that the changes to the
PATHvariable will be applied.
Alternatively, you can download the binary for your platform from the GitHub Releases page and add this binary to your PATH.
2. Create a vcluster
vcluster create vcluster-1 -n host-namespace-1
Alternative A: Helm
Create file vcluster.yaml:
vcluster:
image: rancher/k3s:v1.19.5-k3s2
extraArgs:
- --service-cidr=10.96.0.0/12
baseArgs:
- server
- --write-kubeconfig=/k3s-config/kube-config.yaml
- --data-dir=/data
- --no-deploy=traefik,servicelb,metrics-server,local-storage
- --disable-network-policy
- --disable-agent
- --disable-scheduler
- --disable-cloud-controller
- --flannel-backend=none
- --kube-controller-manager-arg=controllers=*,-nodeipam,-nodelifecycle,-persistentvolume-binder,-attachdetach,-persistentvolume-expander,-cloud-node-lifecycle
storage:
size: 5GiDeploy vcluster via helm:
helm upgrade --install vcluster-1 vcluster \
--values vcluster.yaml \
--repo https://charts.loft.sh \
--namespace vcluster-1 \
--repository-config=''Alternative B: kubectl
Create file vcluster.yaml:
apiVersion: v1
kind: ServiceAccount
metadata:
name: vcluster-1
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: vcluster-1
rules:
- apiGroups: [""]
resources: ["configmaps", "secrets", "services", "services/proxy", "pods", "pods/proxy", "pods/attach", "pods/portforward", "pods/exec", "pods/log", "events", "endpoints", "persistentvolumeclaims"]
verbs: ["*"]
- apiGroups: ["networking.k8s.io"]
resources: ["ingresses"]
verbs: ["*"]
- apiGroups: [""]
resources: ["namespaces"]
verbs: ["get", "list", "watch"]
- apiGroups: ["apps"]
resources: ["statefulsets"]
verbs: ["get", "list", "watch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: vcluster-1
subjects:
- kind: ServiceAccount
name: vcluster-1
roleRef:
kind: Role
name: vcluster-1
apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: Service
metadata:
name: vcluster-1
spec:
type: ClusterIP
ports:
- name: https
port: 443
targetPort: 8443
protocol: TCP
selector:
app: vcluster-1
---
apiVersion: v1
kind: Service
metadata:
name: vcluster-1-headless
spec:
ports:
- name: https
port: 443
targetPort: 8443
protocol: TCP
clusterIP: None
selector:
app: vcluster-1
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: vcluster-1
labels:
app: vcluster-1
spec:
serviceName: vcluster-1-headless
replicas: 1
selector:
matchLabels:
app: vcluster-1
template:
metadata:
labels:
app: vcluster-1
spec:
terminationGracePeriodSeconds: 10
serviceAccountName: vcluster-1
containers:
- image: rancher/k3s:v1.19.5-k3s2
name: virtual-cluster
command:
- "/bin/k3s"
args:
- "server"
- "--write-kubeconfig=/k3s-config/kube-config.yaml"
- "--data-dir=/data"
- "--disable=traefik,servicelb,metrics-server,local-storage"
- "--disable-network-policy"
- "--disable-agent"
- "--disable-scheduler"
- "--disable-cloud-controller"
- "--flannel-backend=none"
- "--kube-controller-manager-arg=controllers=*,-nodeipam,-nodelifecycle,-persistentvolume-binder,-attachdetach,-persistentvolume-expander,-cloud-node-lifecycle"
- "--service-cidr=10.96.0.0/12"
volumeMounts:
- mountPath: /data
name: data
- name: syncer
image: "loftsh/virtual-cluster:0.0.27"
args:
- --service-name=vcluster-1
- --suffix=vcluster-1
- --owning-statefulset=vcluster-1
- --out-kube-config-secret=vcluster-1
volumeMounts:
- mountPath: /data
name: data
volumeClaimTemplates:
- metadata:
name: data
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 5GiCreate vcluster using kubectl:
kubectl apply -f vcluster.yamlAlternative C: Other
Get the Helm chart or Kubernetes manifest and use any tool you like for the deployment of a vcluster, e.g. Argo, Flux etc.3. Use the vcluster
# Start port-forwarding to the vcluster service + set kube-config file
vcluster connect vcluster-1 -n host-namespace-1
export KUBECONFIG=./kubeconfig.yaml
# OR: Start port-forwarding and add kube-context to current kube-config file
vcluster connect vcluster-1 -n host-namespace-1 --update-current
# Run any kubectl, helm, etc. command in your vcluster
kubectl get namespace
kubectl get pods -n kube-system
kubectl create namespace demo-nginx
kubectl create deployment nginx-deployment -n demo-nginx --image=nginx
kubectl get pods -n demo-nginx4. Cleanup
vcluster delete vcluster-1 -n host-namespace-1Alternatively, you could also delete the host-namespace using kubectl.
This project is open-source and licensed under Apache 2.0, so you can use it in any private or commercial projects.
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