centos

centos k8s如何部署应用

小樊
95
2025-02-14 14:19:40
栏目: 智能运维

在CentOS上部署Kubernetes集群并部署应用通常涉及以下步骤:

环境准备

  1. 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
  1. 关闭SELinux
sed -i 's/enforcing/disabled/' /etc/selinux/config
setenforce 0
  1. 关闭swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
  1. 设置主机名
hostnamectl set-hostname <hostname>
  1. 配置hosts文件
cat >> /etc/hosts << EOF
<master-ip> <master-hostname>
<node1-ip> <node1-hostname>
<node2-ip> <node2-hostname>
EOF
  1. 网络配置
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl --system
  1. 时间同步
yum install ntpdate -y
ntpdate time.windows.com

安装Docker

  1. 添加Docker的yum源
cat > /etc/yum.repos.d/docker-ce.repo << EOF
[docker-ce]
name=Docker CE
baseurl=https://mirrors.aliyun.com/docker-ce/linux/centos/$releasever/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/docker-ce/linux/centos/gpg
EOF
  1. 安装Docker CE
yum install -y docker-ce
systemctl start docker
systemctl enable docker

安装Kubernetes组件

  1. 添加Kubernetes的yum源
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
  1. 安装kubeadm, kubelet, kubectl
yum install -y kubelet kubeadm kubectl
systemctl enable kubelet
systemctl start kubelet
  1. 初始化Master节点
kubeadm init --apiserver-advertise-address=<master-ip> --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.0 --service-cidr=10.96.0.0/12 --pod-network-cidr=10.244.0.0/16
  1. 配置kubectl
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
  1. 加入Worker节点

在Master节点生成的命令复制到每个Worker节点并执行。

部署应用

  1. 编写Deployment和Service的YAML文件

例如,部署Tomcat应用的tomcat.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myweb
spec:
  selector:
    matchLabels:
      app: myweb
  replicas: 2
  template:
    metadata:
      labels:
        app: myweb
    spec:
      containers:
      - name: myweb
        image: docker.io/tomcat:latest
        ports:
        - containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: myweb
spec:
  ports:
  - port: 8099
    targetPort: 8080
  selector:
    app: myweb
  type: NodePort
  1. 应用配置
kubectl apply -f tomcat.yaml
  1. 查看部署情况
kubectl get pods

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