Centos7 yum安装k8s 1.23.0
本次部署有3个节点，一个master，2个node。其中maser是192.168.18.11，node分别是192.168.18.12、192.168.18.13。
一、在master：192.168.18.11上
1、前提条件安装docker，并修改/etc/docker/daemon.json
{ "registry-mirrors": ["https://qtlj897j.mirror.aliyuncs.com"], #添加的 "insecure-registries": [ "http://192.168.18.11" ], "exec-opts": ["native.cgroupdriver=systemd"] #添加的 }
2、关闭selinux
setenforce 0 sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
3、配置内核参数
vim /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward=1 # 其值为0,说明禁止进行IP转发；如果是1,则说明IP转发功能已经打开。 net.bridge.bridge-nf-call-ip6tables = 1 # 是否在ip6tables链中过滤IPv6包 net.bridge.bridge-nf-call-iptables = 1 # 二层的网桥在转发包时也会被iptables的FORWARD规则所过滤，这样有时会出现L3层的iptables rules去过滤L2的帧的问题
sysctl -p
4、修改hostname，hosts文件。修改主机名
192.168.18.11 tjgjc-ai11 192.168.18.12 tjgjc-ai12 192.168.18.13 tjgjc-ai13
hostnamectl set-hostname tjgjc-ai11
5、禁用交换分区，否则会在k8s初始化时报错，[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
# 禁用交换分区 swapoff -a # 永久禁用，打开/etc/fstab注释掉swap那一行。 sed -i 's/.*swap.*/#&/' /etc/fstab
6、配置k8s阿里云源
vim /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
7、安装kubeadm、kubectl、kubelet
yum install -y kubectl-1.23.0-0 kubeadm-1.23.0-0 kubelet-1.23.0-0
8、设置kubelet服务开机启动
systemctl enable kubelet
9、初始化k8s，这条命令执行时会卡在[preflight] You can also perform this action in beforehand using ''kubeadm config images pull，大概需要2分钟，请耐心等待。
提示：如果之前安装过k8s需要执行kubeadm reset
kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.23.0 --apiserver-advertise-address 192.168.18.11 --pod-network-cidr=10.244.0.0/16 --token-ttl 0
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 192.168.18.11:6443 --token xybjgk.dnutwxyfpdxnratp \ --discovery-token-ca-cert-hash sha256:21d14e3ebe35ca81caef9653270c5c5a76d841ed4ec18393b3fbdc4fc1deff09
10、看到上面，初始化成功了，上面kubeadm init执行成功后会返回给你node节点加入集群的命令，等会要在node节点上执行，需要保存下来，如果忘记了，可以使用如下命令获取。
kubeadm token create --print-join-command
11、根据提示：To start using your cluster, you need to run the following as a regular user:。运行以下命令
mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
12、配置免密拉取Docker Harbor镜像，所有节点都要登录过Harbor。
kubectl create secret docker-registry harbor-secret（别名） --namespace=项目所在命名空间 --docker-server=Harbor地址 --docker-username=账户 --docker-password=Harbor密码
二、在node节点192.168.18.12、192.168.18.13上
1、前提条件安装docker
2、做maser的2~8步骤的操作
3、加入集群，运行在master初始化k8s时获得的加入集群的命令
kubeadm join 192.168.18.11:6443 --token xybjgk.dnutwxyfpdxnratp \ --discovery-token-ca-cert-hash sha256:21d14e3ebe35ca81caef9653270c5c5a76d841ed4ec18393b3fbdc4fc1deff09
三、在master上安装flannel网络插件
1、从github找到flannel配置文件，注意配置文件中的"Network"字段要和初始化k8s命令的参数--pod-network-cidr=10.244.0.0/16指定的网段一致。
wget https://github.com/flannel-io/flannel/releases/download/v0.26.2/kube-flannel.yml
kube apply -f kube-flannel.yml
2、查看k8s集群的状态，Ready说明成功了
