1.安装kubectl

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

2.关闭防火墙 - 开启机器上的某些端口

systemctl stop firewalld && systemctl disable firewalld

3.禁用交换分区

swapoff -a

vim /etc/fstab - 注释最后一行

4.增加host - 预先添加 IP 路由规则

echo "192.168.23.39 master" >> /etc/hosts

echo "192.168.23.40 node1" >> /etc/hosts

echo "192.168.23.42 node2" >> /etc/hosts

5.设置网桥参数 - 允许 iptables 检查桥接流量

cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf

br_netfilter

EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

EOF

sudo sysctl --system

6.未安装docker - 安装docker

yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine

yum install -y yum-utils

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

yum install -y docker-ce docker-ce-cli containerd.io

mkdir /etc/docker

cat <<EOF | sudo tee /etc/docker/daemon.json

{

  "exec-opts": ["native.cgroupdriver=systemd"],

  "log-driver": "json-file",

  "log-opts": {

    "max-size": "100m"

  },

  "storage-driver": "overlay2"

}

EOF

systemctl enable docker && systemctl daemon-reload && systemctl start docker

7.安装 kubeadm、kubelet 和 kubectl

#cat <<EOF | sudo tee /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

#exclude=kubelet kubeadm kubectl

#EOF

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

[kubernetes]

name=Kubernetes

baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64

enabled=1

gpgcheck=0

repo_gpgcheck=0

gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg

       http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

EOF

sudo setenforce 0

sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

sudo systemctl enable --now kubelet

8.初始化kubeadm - 只在master上用

kubeadm init

替换

kubeadm config images pull --image-repository registry.aliyuncs.com/google_containers

[config/images] Pulled registry.aliyuncs.com/google_containers/kube-apiserver:v1.23.5

[config/images] Pulled registry.aliyuncs.com/google_containers/kube-controller-manager:v1.23.5

[config/images] Pulled registry.aliyuncs.com/google_containers/kube-scheduler:v1.23.5

[config/images] Pulled registry.aliyuncs.com/google_containers/kube-proxy:v1.23.5

[config/images] Pulled registry.aliyuncs.com/google_containers/pause:3.6

[config/images] Pulled registry.aliyuncs.com/google_containers/etcd:3.5.1-0

[config/images] Pulled registry.aliyuncs.com/google_containers/coredns:v1.8.6

kubeadm init --image-repository registry.aliyuncs.com/google_containers

kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr 10.244.0.0/16

[init] Using Kubernetes version: v1.23.5

[preflight] Running pre-flight checks

[preflight] Pulling images required for setting up a Kubernetes cluster

[preflight] This might take a minute or two, depending on the speed of your internet connection

[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'

[certs] Using certificateDir folder "/etc/kubernetes/pki"

[certs] Generating "ca" certificate and key

[certs] Generating "apiserver" certificate and key

[certs] apiserver serving cert is signed for DNS names [km kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.23.39]

[certs] Generating "apiserver-kubelet-client" certificate and key

[certs] Generating "front-proxy-ca" certificate and key

[certs] Generating "front-proxy-client" certificate and key

[certs] Generating "etcd/ca" certificate and key

[certs] Generating "etcd/server" certificate and key

[certs] etcd/server serving cert is signed for DNS names [km localhost] and IPs [192.168.23.39 127.0.0.1 ::1]

[certs] Generating "etcd/peer" certificate and key

[certs] etcd/peer serving cert is signed for DNS names [km localhost] and IPs [192.168.23.39 127.0.0.1 ::1]

[certs] Generating "etcd/healthcheck-client" certificate and key

[certs] Generating "apiserver-etcd-client" certificate and key

[certs] Generating "sa" key and public key

[kubeconfig] Using kubeconfig folder "/etc/kubernetes"

[kubeconfig] Writing "admin.conf" kubeconfig file

[kubeconfig] Writing "kubelet.conf" kubeconfig file

[kubeconfig] Writing "controller-manager.conf" kubeconfig file

[kubeconfig] Writing "scheduler.conf" kubeconfig file

[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"

[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"

[kubelet-start] Starting the kubelet

[control-plane] Using manifest folder "/etc/kubernetes/manifests"

[control-plane] Creating static Pod manifest for "kube-apiserver"

[control-plane] Creating static Pod manifest for "kube-controller-manager"

[control-plane] Creating static Pod manifest for "kube-scheduler"

[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"

[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s

[apiclient] All control plane components are healthy after 8.004215 seconds

[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace

[kubelet] Creating a ConfigMap "kubelet-config-1.23" in namespace kube-system with the configuration for the kubelets in the cluster

NOTE: The "kubelet-config-1.23" naming of the kubelet ConfigMap is deprecated. Once the UnversionedKubeletConfigMap feature gate graduates to Beta the default name will become just "kubelet-config". Kubeadm upgrade will handle this transition transparently.

[upload-certs] Skipping phase. Please see --upload-certs

[mark-control-plane] Marking the node km as control-plane by adding the labels: [node-role.kubernetes.io/master(deprecated) node-role.kubernetes.io/control-plane node.kubernetes.io/exclude-from-external-load-balancers]

[mark-control-plane] Marking the node km as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]

[bootstrap-token] Using token: uls8na.09040heqbwbk7e7u

[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles

[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes

[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials

[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token

[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster

[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace

[kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key

[addons] Applied essential addon: CoreDNS

[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube

  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.

Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:

  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 192.168.23.39:6443 --token uls8na.09040heqbwbk7e7u \

--discovery-token-ca-cert-hash sha256:e0a2baba820581f76434dfd5b68011ce2ed2e644bb50dd73cd84bdeca00bce52

rm -rf $HOME/.kube

mkdir -p $HOME/.kube

sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

sudo chown $(id -u):$(id -g) $HOME/.kube/config

9.安装 Pod 网络附加组件

wget https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml

kubectl apply -f kube-flannel.yml

Warning: policy/v1beta1 PodSecurityPolicy is deprecated in v1.21+, unavailable in v1.25+

podsecuritypolicy.policy/psp.flannel.unprivileged created

clusterrole.rbac.authorization.k8s.io/flannel created

clusterrolebinding.rbac.authorization.k8s.io/flannel created

serviceaccount/flannel created

configmap/kube-flannel-cfg created

daemonset.apps/kube-flannel-ds created

10.node加入

kubeadm join 192.168.23.39:6443 --token uls8na.09040heqbwbk7e7u --discovery-token-ca-cert-hash sha256:e0a2baba820581f76434dfd5b68011ce2ed2e644bb50dd73cd84bdeca00bce52

11.简单命令

kubectl get nodes

kubectl get pods --all-namespaces

kubectl logs podName -n NameSpaceName

12.其他

#时间同步

yum install -y ntpdate

ntpdate time.windows.com