中文学习网站：https://www.kubernetes.org.cn/doc-16

部署docker服务

所有节点部署docker服务
curl -sSL https://get.daocloud.io/docker | sh
systemctl start docker
echo '{"registry-mirrors":["https://reg-mirror.qiniu.com/"]}' >>/etc/docker/daemon.json
systemctl daemon-reload
systemctl restart docker

自己的yum安装没有镜像源，需要配置源

[root@mcw7 ~]$ systemctl stop  firewalld.service
[root@mcw7 ~]$ yum install -y kubelet kubeadm kubectl
Loaded plugins: fastestmirror
base                                                                                                                                                       | 3.6 kB  00:00:00     
epel                                                                                                                                                       | 4.7 kB  00:00:00     
extras                                                                                                                                                     | 2.9 kB  00:00:00     
updates                                                                                                                                                    | 2.9 kB  00:00:00     
(1/3): epel/x86_64/updateinfo                                                                                                                              | 1.0 MB  00:00:01     
(2/3): epel/x86_64/primary_db                                                                                                                              | 7.0 MB  00:00:07     
(3/3): updates/7/x86_64/primary_db                                                                                                                         |  13 MB  00:00:08     
Determining fastest mirrors
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
No package kubelet available.
No package kubeadm available.
No package kubectl available.
Error: Nothing to do
[root@mcw7 ~]$ ls /etc/yum.repos.d/
CentOS-Base.repo  CentOS-Base.repo.backup  CentOS-CR.repo  CentOS-Debuginfo.repo  CentOS-fasttrack.repo  CentOS-Media.repo  CentOS-Sources.repo  CentOS-Vault.repo  epel.repo

配置阿里kubernetes镜像源以及yum安装kubelet/kubeadm/kubectl

所有节点都要安装kubelet/kubeadm/kubectl
阿里云kubernetes镜像源添加指导：https://developer.aliyun.com/mirror/kubernetes?spm=a2c6h.13651102.0.0.3e221b11Ki4Wu1
直接去阿里云镜像源找kubernetes，进行操作

CentOS / RHEL / Fedora


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
setenforce 0
yum install -y kubelet kubeadm kubectl用
systemctl enable kubelet && systemctl start kubelet

用kubeadm创建集群

官网：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

主机规划

主机名   节点类型   ip          
mcw7      master    10.0.0.137
mcw8      node1     10.0.0.138
mcw9      node2     10.0.0.139

初始化Master

[root@mcw7 ~]$ kubeadm init --apiserver-advertise-address 10.0.0.137 --pod-network-cidr=10.244.0.0/24
......
Server:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
errors pretty printing info
, error: exit status 1
    [ERROR Service-Docker]: docker service is not active, please run 'systemctl start docker.service'
    [ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc/sys/net/bridge/bridge-nf-call-iptables does not exist
    [ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1
    [ERROR SystemVerification]: error verifying Docker info: "Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?"
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher  #运行报错，这是因为docker daemon没起

[root@mcw7 ~]$ systemctl start docker.service  #启动docker daemon ,然后初始化Master
[root@mcw7 ~]$ kubeadm init --apiserver-advertise-address 10.0.0.137 --pod-network-cidr=10.244.0.0/24


[root@mcw7 ~]$ kubeadm init --apiserver-advertise-address 10.0.0.137 --pod-network-cidr=10.244.0.0/24
[init] Using Kubernetes version: v1.23.1
[preflight] Running pre-flight checks
    [WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'
    [WARNING Swap]: swap is enabled; production deployments should disable swap unless testing the NodeSwap feature gate of the kubelet
    [WARNING Hostname]: hostname "mcw7" could not be reached
    [WARNING Hostname]: hostname "mcw7": lookup mcw7 on 10.0.0.2:53: no such host 
error execution phase preflight: [preflight] Some fatal errors occurred:
    [ERROR NumCPU]: the number of available CPUs 1 is less than the required 2
    [ERROR Mem]: the system RAM (976 MB) is less than the minimum 1700 MB
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher

再次运行报错：
可用CPU 1的数量小于所需的2可用CPU 1的数量小于所需的2
系统RAM（976 MB）小于最小1700 MB

我的vmware创建的虚拟机是1G的，看来不够

修改虚拟机配置