在CentOS上自动化部署Kubernetes（k8s）集群可以通过多种方法实现，包括使用配置管理工具（如Ansible、Puppet、Chef）、脚本自动化以及容器编排工具（如kubeadm）。以下是一些常见的方法和步骤：
kubeadm是一个用于初始化Kubernetes控制平面和添加工作节点的工具。以下是一个基本的自动化部署步骤：
kubeadm init命令初始化Master节点，并配置API服务器地址、镜像仓库和Pod网络CIDR。kubeadm join命令加入集群。可以编写一个自动化脚本来执行上述步骤。以下是一个简单的示例脚本：
#!/bin/bash # 环境配置 echo "配置环境..." hostnamectl set-hostname $1 sed -i 's/SELINUX.*/SELINUXdisabled/' /etc/selinux/config sed -i '/swap/s///#/g' /etc/fstab yum -y install ca-certificates curl # 安装Docker echo "安装Docker..." yum -y install docker-ce docker-ce-cli containerd.io systemctl enable docker systemctl start docker # 修改Docker的cgroup driver echo "修改Docker的cgroup driver..." mkdir -p /etc/docker cat <<EOF > /etc/docker/daemon.json { "registry-mirrors": ["https://mirrors.aliyun.com"] } EOF systemctl daemon-reload systemctl restart docker # 安装Kubernetes组件 echo "安装Kubernetes组件..." yum -y install kubelet kubeadm kubectl --disableexcludes=kubernetes systemctl enable kubelet && systemctl start kubelet kubectl version # 初始化Master节点 echo "初始化Master节点..." kubeadm init --apiserver-advertise-address=xxx.xxx.xxx.xxx --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 # 加入Worker节点 echo "加入Worker节点..." kubeadm join xxx.xxx.xxx.xxx:xxxx --token=xxxx --discovery-token-ca-cert-hash=sha256:xxxx 配置管理工具如Ansible可以更灵活地管理和部署Kubernetes集群。以下是一个使用Ansible的简单示例：
yum -y install ansible --- - name: Deploy Kubernetes on CentOS hosts: all become: yes tasks: - name: Configure hosts lineinfile: path: /etc/hosts line: "{{ item.1 }}" state: present with_items: - "192.168.1.100 k8s-master" - "192.168.1.101 k8s-node1" - "192.168.1.102 k8s-node2" - name: Disable firewalld and SELinux lineinfile: path: /etc/selinux/config line: "SELINUX=disabled" state: present when: ansible_facts['os_family'] == "RedHat" - name: Disable Swap lineinfile: path: /etc/fstab line: "/dev/mapper/centos-swap swap swap defaults 0 0" state: absent - name: Install Docker yum: name: docker state: present - name: Install Kubernetes packages yum: name: kubelet kubeadm kubectl state: present - name: Initialize Master node command: kubeadm init --apiserver-advertise-address={{ inventory_hostname }} --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16 args: chdir: /root - name: Join Worker nodes command: kubeadm join {{ inventory_hostname }}:6443 --token={{ lookup('file', '/etc/kubernetes/admin.conf') | base64decode }} --discovery-token-ca-cert-hash=sha256:{{ lookup('file', '/etc/kubernetes/admin.conf') | base64decode | hash('sha256') }} args: chdir: /root ansible-playbook -i hosts deploy_kubernetes.yml 通过上述方法，您可以在CentOS上实现Kubernetes集群的自动化部署。选择哪种方法取决于您的具体需求和环境。
