3.1.1 基础设施准备

# 检查服务器硬件
nproc
# 检查系统架构
uname -m
# 检查系统版本
cat /etc/os-release
# 配置系统参数
cat > /etc/sysctl.d/kubernetes.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF
# 应用系统参数
sysctl -p /etc/sysctl.d/kubernetes.conf
# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld
# 关闭SELinux
setenforce 0
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
# 关闭swap
swapoff -a
sed -i '/swap/s/^/#/' /etc/fstab

执行 →

# 检查服务器硬件
4
# 检查系统架构
x86_64
# 检查系统版本
NAME="Oracle Linux Server"
VERSION="8.5"
ID="ol"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="8.5"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Oracle Linux Server 8.5"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:8:5:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://bugzilla.oracle.com/"
ORACLE_BUGZILLA_PRODUCT="Oracle Linux 8"
ORACLE_BUGZILLA_PRODUCT_VERSION=8.5
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=8.5，学习交流加群风哥微信: itpux-com。
# 应用系统参数
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1

3.2.1 安装Kubernetes组件

# 安装Docker
yum install -y docker
systemctl start docker
systemctl enable docker
# 添加Kubernetes仓库
cat > /etc/yum.repos.d/kubernetes.repo << EOF
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
# 安装Kubernetes组件
yum install -y kubelet kubeadm kubectl
systemctl start kubelet
systemctl enable kubelet

执行 →

# 安装Docker
...
Complete!
# 启动Docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
# 安装Kubernetes组件
...
Complete!
# 启动kubelet
Created symlink /etc/systemd/system/multi-user.target.wants/kubelet.service → /usr/lib/systemd/system/kubelet.service.

3.2.2 初始化集群

# 初始化主节点
kubeadm init --pod-network-cidr=10.244.0.0/16
# 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
# 安装网络插件
kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
# 加入工作节点
# 在工作节点上执行kubeadm join命令

执行 →

# 初始化主节点
...
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:，学习交流加群风哥QQ113257174。
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml"
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.1.100:6443 --token abcdef.0123456789abcdef \n    --discovery-token-ca-cert-hash sha256:1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef

3.3.1 部署应用

apiVersion: apps/v1
kind: Deployment
metadata:
  name: fgedu-app
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: fgedu-app
  template:
    metadata:
      labels:
        app: fgedu-app
    spec:
      containers:
      - name: fgedu-app
        image: fgedu/app:v1.0
        ports:
        - containerPort: 8080
        env:
        - name: DB_HOST
          value: mysql
        - name: DB_NAME
          value: fgedudb
        - name: DB_USER
          value: fgedu
        - name: DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: password
---
apiVersion: v1
kind: Service
metadata:
  name: fgedu-app
  namespace: default
spec:
  selector:
    app: fgedu-app
  ports:
  - port: 80
    targetPort: 8080
  type: LoadBalancer