• 内核调整

cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-iptables=1
net.bridge.bridge-nf-call-ip6tables=1
net.bridge.bridge-nf-call-arptables = 1
net.ipv4.ip_forward=1
net.ipv4.tcp_tw_recycle=0
net.core.somaxconn = 32768
vm.swappiness=0 # 禁止使用 swap 空间，只有当系统 OOM 时才允许使用它 vm.overcommit_memory=1 # 不检查物理内存是否够用
vm.panic_on_oom=0 # 开启 OOM
fs.inotify.max_user_instances=8192
fs.inotify.max_user_watches=1048576
fs.file-max=52706963
fs.nr_open=52706963
net.ipv6.conf.all.disable_ipv6=1
net.netfilter.nf_conntrack_max=2310720
net.ipv4.conf.all.rp_filter = 1
net.ipv4.neigh.default.gc_thresh1 = 80000
net.ipv4.neigh.default.gc_thresh2 = 90000
net.ipv4.neigh.default.gc_thresh3 = 100000
EOF

• kube-proxy开启ipvs的前置条件

modprobe br_netfilter
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
modprobe br_netfilter
EOF

cat<<END> install-1.sh 
#!/bin/bash
#yum源配置
systemctl stop firewalld.service
systemctl disable firewalld.service
yum install ipset vim ipvsadm wget bash-completion.noarch -y
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
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=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
cat <<EOF >>  /etc/security/limits.conf
root        soft        nofile        1048576
root        hard        nofile        1048576
root        soft        stack         10240
EOF

# 关闭selinux
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config
grep --color=auto '^SELINUX' /etc/selinux/config
#关闭Swap
swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab 
yum makecache fast -y
yum install -y kubelet-1.23.6 kubeadm-1.23.6 kubectl-1.23.6 && yum install -y  containerd.io
systemctl enable kubelet containerd
modprobe br_netfilter
sysctl --system
sysctl -p /etc/sysctl.d/k8s.conf
chmod +x /etc/sysconfig/modules/ipvs.modules && /etc/sysconfig/modules/ipvs.modules
lsmod | grep -e ip_vs -e nf_conntrack_ipv4
cut -f1 -d " " /proc/modules | grep -e ip_vs -e nf_conntrack_ipv4
lsmod | grep ip_vs
END

• containerd 配置

cat<<END> install-2.sh 
#!/bin/bash
containerd config default > /etc/containerd/config.toml
sed -i "s#k8s.gcr.io/pause:3.6#registry.aliyuncs.com/google_containers/pause:3.6#g" /etc/containerd/config.toml
sed -i "s#https://registry-1.docker.io#https://0k0953tv.mirror.aliyuncs.com#g" /etc/containerd/config.toml
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
systemctl restart containerd
systemctl status containerd.service
#wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.22.0/crictl-v1.22.0-linux-amd64.tar.gz
tar zxvf crictl-v1.23.0-linux-amd64.tar.gz -C /usr/local/bin

cat > /etc/crictl.yaml <<EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 10
debug: false
EOF
crictl config runtime-endpoint unix:/run/containerd/containerd.sock
echo "测试拉取镜像"
crictl pull nginx
crictl images
#runtime
#cat > /etc/sysconfig/kubelet <<EOF
#KUBELET_EXTRA_ARGS=--cgroup-driver=systemd
#EOF
#crictl pull coredns/coredns:1.8.4
#ctr -n k8s.io i tag  docker.io/coredns/coredns:1.8.4 registry.aliyuncs.com/google_containers/coredns:v1.8.4
END

• 最后初始化

• 方法1

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

• 方法2

kubeadm config print init-defaults > kubeadm-config.yaml

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 1.2.3.4 #(这里的ip修改为主机ip）
  bindPort: 6443
nodeRegistration:
  criSocket: /run/containerd/containerd.sock
  name: node
  taints: null
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
# 默认拉取镜像地址k8s.gcr.io国内无法访问，指定阿里云镜像仓库地址
imageRepository: registry.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: 1.21.0
networking:
  dnsDomain: cluster.local
  # networking组下新增一行 podSubnet: "10.244.0.0/16" flannel默认使用的网断
  podSubnet: "10.244.0.0/16"
  serviceSubnet: 10.96.0.0/12
scheduler: {}
---
#开启ipvs
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
mode: ipvs

初始化集群master

kubeadm init  --config kubeadm-init-config.yaml

• 执行安装日志中的加入命令

# 执行安装日志中的加入命令
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

我使用的是方法1

curl https://docs.projectcalico.org/manifests/calico.yaml -O
kubectl apply -f calico.yaml