How to Install Kubernetes Cluster on CentOS 7

สวัสดีครับทุกท่าน ในวันนี้เราก็จะมาติดตั้งตัว Kubernetes Cluter บน CentOS 7 กันนะครับ

สำหรับการติดตั้งผมจะไม่ได้แนะนำการสร้าง Resouce สำหรับ CentOS นะครับ ผมจะคิดว่าทุกท่านมี Resouce แล้ว

เรามาเริ่มกันเลยดีกว่า!!!

#Step 1 : Change hostname to master1 hostnamectl set-hostname master1

#Step 2 : Disable firewalld service systemctl status firewalld ## type yourself don’t copy & paste systemctl stop firewalld ## type yourself don’t copy & paste systemctl disable firewalld

#Step 3 : turns off the swap memory sudo swapoff -a #Step 4 : updates all the packages sudo yum update -y #Step 5 : Installs the YUM utilities, device mapper, and LVM2 sudo yum install -y yum-utils device-mapper-persistent-data lvm2 #Step 6 : Adds the official Docker repository sudo yum-config-manager –add-repo \ https://download.docker.com/linux/centos/docker-ce.repo # Step 7 :Installs Docker Community Edition (CE) sudo yum install -y \ containerd.io \ docker-ce \ docker-ce-cli #Step 8 : Creates a new directory at /etc/docker sudo mkdir /etc/docker #Step 9 : Writes a custom configuration for the Docker daemon to a file named daemon.json. cat <<EOF | sudo tee /etc/docker/daemon.json { “exec-opts”: [“native.cgroupdriver=systemd”], “log-driver”: “json-file”, “log-opts”: { “max-size”: “100m” }, “storage-driver”: “overlay2” } EOF #Step 10 : Creates a directory for Docker service overrides. sudo mkdir -p /etc/systemd/system/docker.service.d #Step 11 : Reloads the systemd configuration sudo systemctl daemon-reload #Step 12 : Restarts the Docker service sudo systemctl restart docker #Step 13 : Enables the Docker service sudo systemctl enable docker #Step 14 : Temporarily sets the SELinux policy to permissive mode sudo setenforce 0 #Step 15 : Permanently changes the SELinux policy to permissive mode sudo sed -i ‘s/^SELINUX=enforcing$/SELINUX=permissive/’ /etc/selinux/config #Step 16 : Overwrites the existing Kubernetes repository configuration cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/ enabled=1 gpgcheck=1 gpgkey=https://pkgs.k8s.io/core:/stable:/v1.29/rpm/repodata/repomd.xml.key exclude=kubelet kubeadm kubectl cri-tools kubernetes-cni EOF #Step 17 : Installs the Kubernetes components kubelet, kubeadm, and kubectl sudo yum install -y kubelet kubeadm kubectl –disableexcludes=kubernetes #Step 18 : Enables the kubelet service sudo systemctl enable –now kubelet #Step 19 : Removes the default containerd configuration file sudo rm /etc/containerd/config.toml #Step 20 : Restarts the containerd service sudo systemctl restart containerd #Step 21 : Adds a setting to the sysctl configuration echo “net.bridge.bridge-nf-call-iptables = 1” | sudo tee -a /etc/sysctl.conf #Step 22 : Applies the new sysctl settings sudo sysctl -p #Step 23 : Initializes a new Kubernetes cluster with a specified CIDR block for pod networking. sudo kubeadm init –pod-network-cidr=192.168.0.0/16 #Step 24 : Creates a directory for the user’s Kubernetes configuration mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config #Step 25 : Deploys the Calico network plugin, which provides networking and network policy kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.27.3/manifests/tigera-operator.yaml kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.27.3/manifests/custom-resources.yaml #Step 26 : Removes the taint from all nodes kubectl taint nodes –all node-role.kubernetes.io/control-plane-

===สำหรับเครื่อง Worker Node ติดตั้งแค่ตาม Step 1 – 22 นะครับ=== #Join Worker Node to Master Run Node 1 : kubeadm join xxx.xxx.x.xxx:6443 –token nraqf2.myj12wgp2as23sd \ –discovery-token-ca-cert-hash sha256:33581a7fdc47da4d549788e62349067c6e0ba66eec8bc35eb28b9ab421d5a76c –ignore-preflight-errors=all Run Node 2 : kubeadm join xxx.xxx.x.xxx:6443 –token nraqf2.myj12wgp2as23sd \ –discovery-token-ca-cert-hash sha256:33581a7fdc47da4d549788e62349067c6e0ba66eec8bc35eb28b9ab421d5a76c –ignore-preflight-errors=all

จากนั้นลองไปที่เครื่อง Master Node kubectl get pod –all-namespaces

สำหรับวันนี้มีเพียงเท่านี้ ขอบคุณครับ