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0 Environmental description

Two centos At least two CentOS machines are required, one as the master node and the other as the worker node. The installed k8s version is 1.23.7.

There will be a comment like #master in front of each bash command, which is used to indicate which type of machine the command is used on.  If there is no comment, the bash command needs to be executed on both types of machines

This document contains the operation and execution process, you can compare the screenshots of the document during the installation process.

1 Basic environment preparation

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Preparing the basic environment to ensure the normal execution of subsequent operations.

1.1 Confirm your OS

Confirm that the operating system of the current machine is CentOS 7  .

Execute command

cat /etc/redhat-release

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If the name is long, it is recommended to use a combination of letters and dashes, such as "aa-bb-cc", here directly set to master and worker1.

Execute command

# master
hostnamectl set-hostname master
hostnamectl
# worker 
hostnamectl set-hostname worker1
hostnamectl 

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The changed host name needs to take effect after reboot.

Execute command

reboot

1.3 Set address mappinmapping

Set address mapping, and test the network.

Execute command

cat <<EOF>> /etc/hosts
${YOUR IP} master
${YOUR IP} worker1
EOF
ping master
ping worker1

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The main content is to install docker-ce, and configure the cgroup driver of docker as systemd, confirm the driver.

2.1 Uninstall old docker

Execute command

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# master
kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version=v1.23.7 --pod-network-cidr=10.10.0.0/16

Execute screenshot

Let kubectl take effect

Execute command

# master
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl get po -A

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Here select cilium as the network plugin

Confirm that your current default version of the kernel is above 4.9

Check the current kernel version

Execute command

# master  
uname -sr

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7 Propagate a deployment by Karmada

Before propagating a deployment, make sure the worker cluster is already working properly And get the latest config currently running

In the following steps, we are going to propagate a deployment by Karmada. We use the installation of nginx as an example

7.1 Join a worker/member cluster to karmada control plane

Here we add the working node cluster through push mode

It is worth noting that /root/.kube/config is Kubernetes host config and the /etc/karmada/karmada-apiserver.config is Karmada's configkarmada-apiserver config

Execute command

kubectl karmada --kubeconfig /etc/karmada/karmada-apiserver.config  joinjoin ${YOUR MEMBER NAME} --cluster-kubeconfig=${YOUR MEMBER CONFIG PATH} --cluster-context=${YOUR CLUSTER CONTEXT}

Image RemovedImage Added

Here is example command for your information: kubectl karmada --kubeconfig /etc/karmada/karmada-apiserver.config  join member1 --cluster-kubeconfig=/root/.kube/192.168.30.22_member1-config --cluster-context=kubernetes-admin@kubernetes

• --kubeconfig  specifies the Karmada's kubeconfig file and the CLI 
• --cluster-kubeconfig specifies the member's config. Generally, it can be obtained from the worker cluster in "/root/.kube/config"
• --cluster-context the value of current-context from --cluster-kubeconfig

If you want unjoin the member cluster, just change the join to unjoin:   kubectl karmada --kubeconfig /etc/karmada/karmada-apiserver.config  unjoin member2 --cluster-kubeconfig=/root/.kube/192.168.30.2_config --cluster-context=kubernetes-admin@kubernetes

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7.2 Create nginx deployment in Karmada

deployment.yaml  are obtained through here https://github.com/karmada-io/karmada/tree/master/samples/nginx

Execute command

kubectl create -f /root/sample/nginx/deployment.yaml --kubeconfig /etc/karmada/karmada-apiserver.config
kubectl get deployment  --kubeconfig /etc/karmada/karmada-apiserver.config 

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7.3 Create PropagationPolicy that will propagate nginx to member cluster

propagationpolicy.yaml  are obtained through here https://github.com/karmada-io/karmada/tree/master/samples/nginx

Execute command

kubectl create -f /root/sample/nginx/propagationpolicy.yaml --kubeconfig /etc/karmada/karmada-apiserver.config

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