此次搭建使用的是root用户，有网的情况下

没有命令解释

所有节点执行

#! /bin/bash
cat >  /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness = 0
EOF

modprobe br_netfilter
lsmod | grep br_netfilter
 sysctl -p /etc/sysctl.d/k8s.conf
yum -y install ipset ipvsadm

cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
EOF

chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep -e ip_vs -e nf_conntrack

wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo

yum -y install --setopt=obsoletes=0 docker-ce-20.10.9-3.el7
 systemctl enable docker ; systemctl start docker

cat >/etc/docker/daemon.json  << EOF
 {
        "exec-opts": ["native.cgroupdriver=systemd"],
        "registry-mirrors": [
        "http://hub-mirror.c.163.com",
        "https://docker.mirrors.ustc.edu.cn",
        "https://registry.docker-cn.com"
    ]
}
EOF

systemctl restart docker

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[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

yum install -y --nogpgcheck  kubeadm-1.21.0-0  kubelet-1.21.0-0 kubectl-1.21.0-0

cat > /etc/sysconfig/kubelet << EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=systemd"
EOF

systemctl enable kubelet
kubeadm  config images pull  --image-repository registry.aliyuncs.com/google_containers
docker pull registry.aliyuncs.com/google_containers/coredns:1.8.0

docker tag registry.aliyuncs.com/google_containers/coredns:1.8.0 registry.aliyuncs.com/google_containers/coredns/coredns:v1.8.0

主节点

kubeadm init --kubernetes-version=v1.21.0 --pod-network-cidr=192.168.0.0/16  --image-repository registry.aliyuncs.com/google_containers

export KUBECONFIG=/etc/kubernetes/admin.conf

source <(kubectl completion bash) && echo 'source <(kubectl completion bash)' >> ~/.bashrc

安装网络插件
官网 https://projectcalico.docs.tigera.io/getting-started/kubernetes/quickstart

kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.24.5/manifests/tigera-operator.yaml
kubectl create -f https://raw.githubusercontent.com/projectcalico/calico/v3.24.5/manifests/custom-resources.yaml

创建一个pod检查k8s可不可以使用

cat > ningx-pod.yaml << EOF
---
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:alpine
    ports:
    - containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  selector:
    app: nginx
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80
    nodePort: 30080
  type: NodePort

EOF