centos系統安裝Kubernetes集群步驟
前言
安裝前請準備
選擇4核8G(master)、8核16G(node1)、8核16G(node2) 三臺機器,按量付費進行實驗,CentOS7.9
這裡的機器默認都是幹凈的,建議租雲上的機器,差不多一個小時3塊錢,自己搭虛擬機也行
雲上機器
vpc網絡: 172.31.0.0/16
私有網絡:172.31.0.0/24
安全組端口開放:22、30000~32767
1、安裝Docker
請在三臺機器上安裝docker,執行下面的命令即可
sudo yum remove docker* sudo yum install -y yum-utils #配置docker的yum地址 sudo yum-config-manager \ --add-repo \ http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo #安裝指定版本 sudo yum install -y docker-ce-20.10.7 docker-ce-cli-20.10.7 containerd.io-1.4.6 # 啟動&開機啟動docker systemctl enable docker --now # docker加速配置 sudo mkdir -p /etc/docker sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors": ["https://82m9ar63.mirror.aliyuncs.com"], "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2" } EOF sudo systemctl daemon-reload sudo systemctl restart docker
2、安裝Kubernetes
1、基本環境
每個機器使用內網ip互通
每個機器配置自己的hostname,不能用localhost
三臺機器設置hostname
#設置每個機器自己的hostname hostnamectl set-hostname xxx 例如: hostnamectl set-hostname master hostnamectl set-hostname node1 hostnamectl set-hostname node2
基礎設置(三臺機器全部都要設置)
# 將 SELinux 設置為 permissive 模式(相當於將其禁用) sudo setenforce 0 sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config #關閉swap關閉分區 swapoff -a sed -ri 's/.*swap.*/#&/' /etc/fstab #允許 iptables 檢查橋接流量 cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf br_netfilter EOF cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF sudo sysctl --system
2、安裝kubelet、kubeadm、kubectl(三臺機器全部都要設置)
#配置k8s的yum源地址 cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF #安裝 kubelet,kubeadm,kubectl sudo yum install -y kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9 #啟動kubelet sudo systemctl enable --now kubelet
⚠️ 註意⚠️ : 三臺機器同時寫一個域名來配置master節點的ip地址
#所有機器配置master域名 echo "172.31.0.4 k8s-master" >> /etc/hosts
3、初始化master節點
1、初始化
⚠️ – apiserver-advertise-address = 你master節點的ip
⚠️ – control-plane-endpoint = 你上面配置的域名
kubeadm init \ --apiserver-advertise-address=172.31.0.4 \ --control-plane-endpoint=k8s-master \ --image-repository registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images \ --kubernetes-version v1.20.9 \ --service-cidr=10.96.0.0/16 \ --pod-network-cidr=192.168.0.0/16
2、記錄關鍵信息
當前初始化完成之後將會輸出下面的信息,記得保存到本地哦
⚠️下面的操作將用到這個輸出的內容,下面的操作請不要復制我這裡的命令,以自己的實際輸出為準
Your Kubernetes control-plane has initialized successfully! To start using your cluster, you need to run the following as a regular user: mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config Alternatively, if you are the root user, you can run: export KUBECONFIG=/etc/kubernetes/admin.conf You should now deploy a pod network to the cluster. Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at: https://kubernetes.io/docs/concepts/cluster-administration/addons/ You can now join any number of control-plane nodes by copying certificate authorities and service account keys on each node and then running the following as root: kubeadm join k8s-master:6443 --token 3vckmv.lvrl05xpyftbs177 \ --discovery-token-ca-cert-hash sha256:1dc274fed24778f5c284229d9fcba44a5df11efba018f9664cf5e8ff77907240 \ --control-plane Then you can join any number of worker nodes by running the following on each as root: kubeadm join k8s-master:6443 --token 3vckmv.lvrl05xpyftbs177 \ --discovery-token-ca-cert-hash sha256:1dc274fed24778f5c284229d9fcba44a5df11efba018f9664cf5e8ff77907240
保存後執行輸出中的內容
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
3、安裝Calico網絡插件
先下載calico.yaml ,然後使用kubectl來部署
curl https://docs.projectcalico.org/manifests/calico.yaml -O kubectl apply -f calico.yaml
4、加入worker節點
上面成功部署之後輸出的內容註意,最後面
Then you can join any number of worker nodes by running the following on each as root: kubeadm join k8s-master:6443 --token 3vckmv.lvrl05xpyftbs177 \ --discovery-token-ca-cert-hash sha256:1dc274fed24778f5c284229d9fcba44a5df11efba018f9664cf5e8ff77907240
將命令復制到其他的node節點上執行,如果master上也執行瞭,則master也當作成一個工作節點瞭
擴展:加入master節點(多個master節點)
上面成功部署之後輸出的內容註意,最後面
You can now join any number of control-plane nodes by copying certificate authorities and service account keys on each node and then running the following as root: kubeadm join k8s-master:6443 --token 3vckmv.lvrl05xpyftbs177 \ --discovery-token-ca-cert-hash sha256:1dc274fed24778f5c284229d9fcba44a5df11efba018f9664cf5e8ff77907240 \ --control-plane
在其他你需要成為master節點的機器上執行即可
5、驗證
kubectl get node
至此安裝成功
總結
到此這篇關於centos系統安裝Kubernetes集群步驟的文章就介紹到這瞭,更多相關centos安裝Kubernetes內容請搜索WalkonNet以前的文章或繼續瀏覽下面的相關文章希望大傢以後多多支持WalkonNet!
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