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Installing Karmada
Prerequisites
Karmada kubectl plugin
kubectl-karmada is the Karmada command-line tool that lets you control the Karmada control plane, it presents as
the kubectl plugin.
For installation instructions see installing kubectl-karmada.
Install Karmada by Karmada command-line tool
Install Karmada on your own cluster
Assume you have put your cluster's kubeconfig file to $HOME/.kube/config or specify the path
with KUBECONFIG environment variable. Otherwise, you should specify the configuration file by
setting --kubeconfig flag to the following commands.
Note: The
initcommand is available from v1.0.
Run the following command to install:
kubectl karmada init
It might take about 5 minutes and if everything goes well, you will see outputs similar to:
I1216 07:37:45.862959 4256 cert.go:230] Generate ca certificate success.
I1216 07:37:46.000798 4256 cert.go:230] Generate etcd-server certificate success.
...
...
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Karmada is installed successfully.
Register Kubernetes cluster to Karmada control plane.
Register cluster with 'Push' mode
Step 1: Use karmadactl join to register the cluster to Karmada control panel. --cluster-kubeconfig is members kubeconfig.
(In karmada)~# MEMBER_CLUSTER_NAME=`cat ~/.kube/config | grep current-context | sed 's/: /\n/g'| sed '1d'`
(In karmada)~# karmadactl --kubeconfig /etc/karmada/karmada-apiserver.config join ${MEMBER_CLUSTER_NAME} --cluster-kubeconfig=$HOME/.kube/config
Step 2: Show members of karmada
(In karmada)~# kubectl --kubeconfig /etc/karmada/karmada-apiserver.config get clusters
Register cluster with 'Pull' mode
Step 1: Send karmada kubeconfig and karmada-agent.yaml to member kubernetes
(In karmada)~# scp /etc/karmada/karmada-apiserver.config /etc/karmada/karmada-agent.yaml {member kubernetes}:~
Step 2: Create karmada kubeconfig secret
Notice:
Cross-network, need to change the config server address.
(In member kubernetes)~# kubectl create ns karmada-system
(In member kubernetes)~# kubectl create secret generic karmada-kubeconfig --from-file=karmada-kubeconfig=/root/karmada-apiserver.config -n karmada-system
Step 3: Create karmada agent
(In member kubernetes)~# MEMBER_CLUSTER_NAME="demo"
(In member kubernetes)~# sed -i "s/{member_cluster_name}/${MEMBER_CLUSTER_NAME}/g" karmada-agent.yaml
(In member kubernetes)~# kubectl apply -f karmada-agent.yaml
Step 4: Show members of karmada
(In karmada)~# kubectl --kubeconfig /etc/karmada/karmada-apiserver.config get clusters
The components of Karmada are installed in karmada-system namespace by default, you can get them by:
kubectl get deployments -n karmada-system
NAME READY UP-TO-DATE AVAILABLE AGE
karmada-aggregated-apiserver 1/1 1 1 102s
karmada-apiserver 1/1 1 1 2m34s
karmada-controller-manager 1/1 1 1 116s
karmada-scheduler 1/1 1 1 119s
karmada-webhook 1/1 1 1 113s
kube-controller-manager 1/1 1 1 2m3s
And the karmada-etcd is installed as the StatefulSet, get it by:
kubectl get statefulsets -n karmada-system
NAME READY AGE
etcd 1/1 28m
The configuration file of Karmada will be created to /etc/karmada/karmada-apiserver.config by default.
Offline installation
When installing Karmada, the kubectl karmada init will download the APIs(CRD) from the Karmada official release page
(e.g. https://github.com/karmada-io/karmada/releases/tag/v0.10.1) and load images from the official registry by default.
If you want to install Karmada offline, maybe you have to specify the APIs tar file as well as the image.
Use --crds flag to specify the CRD file. e.g.
kubectl karmada init --crds /$HOME/crds.tar.gz
The images of Karmada components could be specified, take karmada-controller-manager as an example:
kubectl karmada init --karmada-controller-manager-image=example.registry.com/library/karmada-controller-manager:1.0
Deploy HA
Use --karmada-apiserver-replicas and --etcd-replicas flags to specify the number of the replicas (defaults to 1).
kubectl karmada init --karmada-apiserver-replicas 3 --etcd-replicas 3
Install Karmada in Kind cluster
kind is a tool for running local Kubernetes clusters using Docker container "nodes". It was primarily designed for testing Kubernetes itself, not for production.
Create a cluster named host by hack/create-cluster.sh:
hack/create-cluster.sh host $HOME/.kube/host.config
Install Karmada v1.2.0 by command kubectl karmada init:
kubectl karmada init --crds https://github.com/karmada-io/karmada/releases/download/v1.2.0/crds.tar.gz --kubeconfig=$HOME/.kube/host.config
Check installed components:
kubectl get pods -n karmada-system --kubeconfig=$HOME/.kube/host.config
NAME READY STATUS RESTARTS AGE
etcd-0 1/1 Running 0 2m55s
karmada-aggregated-apiserver-84b45bf9b-n5gnk 1/1 Running 0 109s
karmada-apiserver-6dc4cf6964-cz4jh 1/1 Running 0 2m40s
karmada-controller-manager-556cf896bc-79sxz 1/1 Running 0 2m3s
karmada-scheduler-7b9d8b5764-6n48j 1/1 Running 0 2m6s
karmada-webhook-7cf7986866-m75jw 1/1 Running 0 2m
kube-controller-manager-85c789dcfc-k89f8 1/1 Running 0 2m10s
Install Karmada by Helm Chart Deployment
Please refer to installing by Helm.
Install Karmada from source
Please refer to installing from source.
Install Karmada for development environment
If you want to try Karmada, we recommend that build a development environment by
hack/local-up-karmada.sh which will do following tasks for you:
- Start a Kubernetes cluster by kind to run the Karmada control plane, aka. the
host cluster. - Build Karmada control plane components based on a current codebase.
- Deploy Karmada control plane components on the
host cluster. - Create member clusters and join Karmada.
1. Clone Karmada repo to your machine:
git clone https://github.com/karmada-io/karmada
or use your fork repo by replacing your GitHub ID:
git clone https://github.com/<GitHub ID>/karmada
2. Change to the karmada directory:
cd karmada
3. Deploy and run Karmada control plane:
run the following script:
hack/local-up-karmada.sh
This script will do following tasks for you:
- Start a Kubernetes cluster to run the Karmada control plane, aka. the
host cluster. - Build Karmada control plane components based on a current codebase.
- Deploy Karmada control plane components on the
host cluster. - Create member clusters and join Karmada.
If everything goes well, at the end of the script output, you will see similar messages as follows:
Local Karmada is running.
To start using your Karmada environment, run:
export KUBECONFIG="$HOME/.kube/karmada.config"
Please use 'kubectl config use-context karmada-host/karmada-apiserver' to switch the host and control plane cluster.
To manage your member clusters, run:
export KUBECONFIG="$HOME/.kube/members.config"
Please use 'kubectl config use-context member1/member2/member3' to switch to the different member cluster.
4. Check registered cluster
kubectl get clusters --kubeconfig=/$HOME/.kube/karmada.config
You will get similar output as follows:
NAME VERSION MODE READY AGE
member1 v1.23.4 Push True 7m38s
member2 v1.23.4 Push True 7m35s
member3 v1.23.4 Pull True 7m27s
There are 3 clusters named member1, member2 and member3 have registered with Push or Pull mode.