K8S集群搭建(多master多node节点)-Toy模板网

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一部署环境

关闭防火墙

设置主机名hostname，管理节点设置主机名为 master

配置hosts主机名解析

配置免密登陆

关闭交换分区

配置内核参数，将桥接的IPv4流量传递到iptables的链

开启ipvs

二配置软件源

升级centos系统内核

配置时间同步

安装docker服务以及K8S

查看docker服务和K8S服务是否起来

配置docker加速

三通过keepalived+nginx 实现k8s apiserver节点高可用

安装nginx和keepalived主备

修改nginx配置文件，主备配置文件是一样的

keepalived配置 Master1

keepalived配置 Master2

查看IP地址出现192.168.100.222/24虚拟VIP地址

ping 虚拟VIP地址 192.168.100.222

四集群初始化

生成默认kubeadm-config.yaml 文件

传kubeadm-config.yaml 给其他master节点

所有Master节点提前下载镜像（master1和master2都要下载）

初始化集群

初始化成功以后，会产生Token值，用于其他节点加入时使用

配置环境变量

查看节点状态：

所有的系统组件均以容器的方式运行并且在kube-system命名空间内，此时可以查看Pod状态

在要加入集群的节点执行以下命令

添加其他主节点 master2，执行以下命令

如果遇到kubeadm init报错10248不健康

node节点加入集群执行以下命令

解决方式

node节点添加成功

添加完成查看结果

五安装网络插件

查看节点状态

如果报错显示以下内容：

六部署k8s的dashboard

执行yaml文件直接部署 k8s与dashboard 对应版本安装

查看dashboard运行状态，以deployment方式部署，运行2个pod及2个service

查看暴露的service,已修改为nodeport类型：

登录dashboard

创建登录用户以及查看访问Dashboard的认证令牌

把获取到的Token复制到登录界面的Token输入框中，登陆成功

一部署环境

多台运行着下列系统的机器：
CentOS 7.9 每台机器 2 GB 或更多的 RAM内存2 CPU 核或更多
集群中的所有机器的网络彼此均能相互连接(公网和内网都可以)节点之中不可以有重复的主机名，

Hostname	ip地址	系统
master1	192.168.100.10	CentOS 7.9
master2	192.168.100.11	CentOS 7.9
node1	192.168.100.13	CentOS 7.9
node2	192.168.100.14	CentOS 7.9
虚拟vip	192.168.100.222	CentOS 7.9

docker 版本 v20.10.2

k8s 版本 v1.23.6

关闭防火墙

setenforce 0
sed -ri '/^[^#]*SELINUX=/s#=.+$#=disabled#' /etc/selinux/config
systemctl stop firewalld
systemctl disable firewalld
reboot  重启系统

设置主机名hostname，管理节点设置主机名为 master

[root@localhost ~]# hostnamectl  set-hostname  master1  && bash
[root@localhost ~]# hostnamectl  set-hostname  master2  && bash
[root@localhost ~]# hostnamectl  set-hostname  node1     && bash
[root@localhost ~]# hostnamectl  set-hostname  node2     && bash

配置hosts主机名解析

cat <<EOF>>/etc/hosts
192.168.100.10 master1
192.168.100.11 master2
192.168.100.13 node1
192.168.100.14 node2
192.168.100.222 k8s-vip 
EOF

配置免密登陆

[root@master1 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:V5ewxAlLVa3ZTkuMwfZzelE4Dz40l9K7OHMRDlQ+ja8 root@master1
The key's randomart image is:
+---[RSA 2048]----+
|          o+*+++.|
|         . ooOB*=|
|          . +o%%=|
|           . o=@*|
|        S .   o=O|
|         .   +.=o|
|              E. |
|                 |
|                 |
+----[SHA256]-----+
[root@master1 ~]# ls

将本地生成的秘钥文件和私钥文件拷贝到远程主机

[root@master1 ~]# ssh-copy-id master2
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host 'master2 (192.168.100.11)' can't be established.
ECDSA key fingerprint is SHA256:QC+4rc9118CZXii4A+dD7e9IXryxnCFpXC1ZoGLO3QU.
ECDSA key fingerprint is MD5:f1:70:b0:c6:0a:77:d9:00:b1:41:79:c3:3b:1c:88:1d.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@master2's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'master2'"
and check to make sure that only the key(s) you wanted were added.

[root@master1 ~]# 

[root@master1 ~]# ssh-copy-id node1    
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host 'node1 (192.168.100.13)' can't be established.
ECDSA key fingerprint is SHA256:QC+4rc9118CZXii4A+dD7e9IXryxnCFpXC1ZoGLO3QU.
ECDSA key fingerprint is MD5:f1:70:b0:c6:0a:77:d9:00:b1:41:79:c3:3b:1c:88:1d.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@node1's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node1'"
and check to make sure that only the key(s) you wanted were added.

[root@master1 ~]# ssh-copy-id node2
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host 'node2 (192.168.100.14)' can't be established.
ECDSA key fingerprint is SHA256:QC+4rc9118CZXii4A+dD7e9IXryxnCFpXC1ZoGLO3QU.
ECDSA key fingerprint is MD5:f1:70:b0:c6:0a:77:d9:00:b1:41:79:c3:3b:1c:88:1d.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@node2's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node2'"
and check to make sure that only the key(s) you wanted were added.

[root@master1 ~]# 
[root@master1 ~]# ssh node1     ##验证成功
Last login: Fri Dec 16 11:17:20 2022 from 192.168.100.1
[root@master1 ~]# ssh master2
Last login: Fri Dec 16 11:23:46 2022 from node2
[root@master2 ~]# exit

或者用
for i in master1 master2  node1 node2;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

关闭交换分区

swapoff -a
sed -i 's/.*swap.*/#&/' /etc/fstab   


swapoff -a  #临时关闭
永久关闭，将/etc/fstab中的如下一行注释掉
#/dev/mapper/centos-swap swap swap defaults 0 0
同样的操作在master2和node1上也分别做一下。
为什么要关掉swap呢？
k8s在设计时就考虑要提升性能，不让使用swap,如果不关的话，初始化时将会提示错误。

配置内核参数，将桥接的IPv4流量传递到iptables的链

cat <<EOF> /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

使配置生效
[root@master1 ~]# modprobe br_netfilter
[root@master1 ~]# sysctl  --system

开启ipvs

开启ipvs

cat > /etc/sysconfig/modules/ipvs.modules <<END
#!/bin/bash
ipvs_modules="ip_vs ip_vs_lc ip_vs_wlc ip_vs_rr ip_vs_wrr ip_vs_lblc ip_vs_lblcr ip_vs_dh ip_vs_sh ip_vs_nq ip_vs_sed ip_vs_ftp nf_conntrack"
for kernel_module in ${ipvs_modules}; do
 /sbin/modinfo -F filename ${kernel_module} > /dev/null 2>&1
 if [ 0 -eq 0 ]; then
 /sbin/modprobe ${kernel_module}
 fi
done
END


chmod 755 /etc/sysconfig/modules/ipvs.modules
bash /etc/sysconfig/modules/ipvs.modules

二配置软件源

mkdir -p /etc/yum.repos.d/repo.bak
mv /etc/yum.repos.d/*.repo  /etc/yum.repo.d/repo.bak
cd /etc/yum.repos.d/

##安装epel源
rpm --imp ort https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
yum install -y https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

##配置docker-ce的源
yum install -y yum-utils
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

##安装k8syum源  
cat <<EOF | sudo tee /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
exclude=kubelet kubeadm kubectl
EOF

##安装基础软件包
yum install -y yum-utils device-mapper-persistent-data lvm2 wget net-tools nfs-utils lrzsz gcc gcc-c++ make cmake libxml2-devel openssl-devel curl curl-devel unzip sudo ntp libaio-devel vim ncurses-devel autoconf automake zlib-devel python-devel epel-release openssh-server socat ipvsadm conntrack ntpdate telnet 

yum clean all && yum makecache   ##清理yum缓存

升级centos系统内核

yum update 

查看内核版本并安装最新版本
yum list available --disablerepo=* --enablerepo=elrepo-kernel

安装最新lt内核版本
yum --disablerepo='*' --enablerepo=elrepo-kernel install kernel-lt -y

查看系统grub内核的启动列表，这里编号0的5.4.227的lt版本是我们新安装的
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

[root@master1 ~]# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux (5.4.227-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-1160.80.1.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-1160.71.1.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-46ef9765f6e049aab7416cf2a8a3042e) 7 (Core)
[root@master1 ~]# 

指定以新安装的编号0的内核版本为默认启动内核
[root@master1 ~]# grub2-set-default 0

卸载旧内核版本
yum remove kernel -y

重启机器，以新内核版本加载启动
reboot

查看当前内核版本
[root@master1 ~]# uname -r
5.4.227-1.el7.elrepo.x86_64

配置时间同步

yum -y install chrony

$ vim /etc/chrony.conf
root@master1 ~]# cat  /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).

server ntp.aliyun.com iburst          ##添加
server ntp.tencent.com iburst         ###添加

#server 0.centos.pool.ntp.org iburst    #注销
#server 1.centos.pool.ntp.org iburst    #注销
#server 2.centos.pool.ntp.org iburst    #注销
#server 3.centos.pool.ntp.org iburst    #注销


#启动和配置自启动
systemctl enable chronyd
systemctl start chronyd

安装docker服务以及K8S

docker安装
yum -y install docker-ce-20.10.2

systemctl start docker && systemctl enable docker && systemctl status docker


kubernetes安装
yum install -y kubelet-1.23.6 kubeadm-1.23.6 kubectl-1.23.6 --disableexcludes=kubernetes

systemctl enable kubelet && systemctl start kubelet && systemctl status kubelet

查看docker服务和K8S服务是否起来

dockers服务起来

[root@master1 ~]#systemctl start docker && systemctl enable docker && systemctl status docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since 五 2022-12-16 14:57:14 CST; 67ms ago
     Docs: https://docs.docker.com
 Main PID: 16544 (dockerd)
   CGroup: /system.slice/docker.service
           └─16544 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.s...

12月 16 14:57:13 master1 dockerd[16544]: time="2022-12-16T14:57:13.867503820+08:00"...pc
12月 16 14:57:13 master1 dockerd[16544]: time="2022-12-16T14:57:13.912388135+08:00"...t"
12月 16 14:57:13 master1 dockerd[16544]: time="2022-12-16T14:57:13.912414989+08:00"...e"
12月 16 14:57:13 master1 dockerd[16544]: time="2022-12-16T14:57:13.912622411+08:00"...."
12月 16 14:57:14 master1 dockerd[16544]: time="2022-12-16T14:57:14.009252102+08:00"...s"
12月 16 14:57:14 master1 dockerd[16544]: time="2022-12-16T14:57:14.067230875+08:00"...."
12月 16 14:57:14 master1 dockerd[16544]: time="2022-12-16T14:57:14.124998469+08:00"....7
12月 16 14:57:14 master1 dockerd[16544]: time="2022-12-16T14:57:14.125084166+08:00"...n"
12月 16 14:57:14 master1 systemd[1]: Started Docker Application Container Engine.
12月 16 14:57:14 master1 dockerd[16544]: time="2022-12-16T14:57:14.142287793+08:00"...k"
Hint: Some lines were ellipsized, use -l to show in full.

kubelet服务启动成功

[root@master1 ~]# systemctl enable kubelet && systemctl start kubelet && systemctl status kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since 五 2022-12-16 15:08:36 CST; 34ms ago
     Docs: https://kubernetes.io/docs/
 Main PID: 21511 (kubelet)
    Tasks: 6
   Memory: 9.9M
   CGroup: /system.slice/kubelet.service
           └─21511 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-k...

12月 16 15:08:36 master1 systemd[1]: Started kubelet: The Kubernetes Node Agent.

配置docker加速

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://82m9ar63.mirror.aliyuncs.com"],
  "exec-opts": ["native.cgroupdriver=systemd"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "100m"
  },
  "storage-driver": "overlay2"
}
EOF

sudo systemctl daemon-reload
sudo systemctl restart docker

注：以上操作4个节点系统都要做

三通过keepalived+nginx 实现k8s apiserver节点高可用

安装nginx和keepalived主备

#在master1和master2上做nginx主备安装

安装nginx  keepalived     nginx-all-modules #这个如果不安装的话，启动nginx服务时会报错  
yum install -y nginx keepalived   nginx-all-modules

修改nginx配置文件，主备配置文件是一样的

从worker_connections 1024 之后开始添加（注：master1 2 都改）

#Master1和Master2上均做
cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak

vim /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
    worker_connections 1024;
}

stream {
 log_format main '$remote_addr $upstream_addr - [$time_local] $status $upstream_bytes_sent';
 access_log /var/log/nginx/k8s-access.log main;
 upstream k8s-apiserver {
   server 192.168.100.10:6443;    #Master1 APISERVER IP:PORT
   server 192.168.100.11:6443;    #Master2 APISERVER IP:PORT

 }
 server {
  listen 16443;  #由于nginx与master节点复用，这个监听端口不能是6443，否则会冲突
 proxy_pass k8s-apiserver;
 }
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 4096;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
   #include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 default_server;
        server_name  _;
        location = / {
        }
    }
}



启动nginx服务
systemctl enable nginx --now

keepalived配置 Master1

#Master1做成主

#vrrp_script：指定检查 nginx 工作状态脚本（根据 nginx 状态判断是否故障转移） #virtual_ipaddress：虚拟 IP（VIP）

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

vim  /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1      #修改
   smtp_connect_timeout 30
   router_id NGINX_MASTER     #修改id
   vrrp_skip_check_adv_addr
   #vrrp_strict               ##注销掉否则ping不通虚拟VIP地址   
   vrrp_garp_interval 0
   vrrp_gna_interval 0

}

   vrrp_script check_nginx {
        script "/etc/keepalived/check_nginx.sh"    #添加检查脚本
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33    #修改为实际网卡名
    virtual_router_id 51  #VRRP路由ID实例，每个实例是唯一的
    priority 100   #优先级，备服务器设置90
    advert_int 1    #指定VRRP心跳包通告间隔时间，默认1秒
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    #虚拟IP
    virtual_ipaddress {
        192.168.100.222/24      ##修改虚拟VIP地址
    }
    track_script {
       check_nginx      #添加检查nginx脚本
    }





#脚本
#注：keepalived 根据脚本返回状态码（0 为工作不正常，非 0 正常）判断是否故障转移。

cat <<EOF>> /etc/keepalived/check_nginx.sh 
#!/bin/bash 
count=$(ps -ef |grep nginx | grep sbin | egrep -cv "grep|$$") 
if [ "$count" -eq 0 ];then 
 systemctl stop keepalived 
fi
EOF

chmod a+x /etc/keepalived/check_nginx.sh

systemctl enable keepalived --now

keepalived配置 Master2

#Master2做成备
#vrrp_script：指定检查 nginx 工作状态脚本（根据 nginx 状态判断是否故障转移） #virtual_ipaddress：虚拟 IP（VIP）

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak
vim  /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 127.0.0.1        #修改
   smtp_connect_timeout 30
   router_id NGINX_BACKUP       #修改id
   vrrp_skip_check_adv_addr
   #vrrp_strict               ##注销掉否则ping不通虚拟VIP地址   
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

   vrrp_script check_nginx {
        script "/etc/keepalived/check_nginx.sh"
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33         #修改为实际网卡名
    virtual_router_id 51    #VRRP路由ID实例，每个实例是唯一的
    priority 90             #优先级，主服务器设置100
    advert_int 1            #指定VRRP心跳包通告间隔时间，默认1秒
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    #虚拟IP
    virtual_ipaddress {
        192.168.100.222/24     #修改虚拟VIP地址
    }
    track_script {
       check_nginx
    }
}




#脚本
#注：keepalived 根据脚本返回状态码（0 为工作不正常，非 0 正常）判断是否故障转移。


cat <<EOF>> /etc/keepalived/check_nginx.sh
#!/bin/bash 
count=$(ps -ef |grep nginx | grep sbin | egrep -cv "grep|$$") 
if [ "$count" -eq 0 ];then 
 systemctl stop keepalived 
fi
EOF

chmod a+x /etc/keepalived/check_nginx.sh
systemctl enable keepalived --now

查看IP地址出现192.168.100.222/24虚拟VIP地址

[root@master1 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:b1:d6:6e brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.10/24 brd 192.168.100.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.100.222/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::137d:5b9f:cc00:a088/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:c9:4d:2b:b7 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever

ping 虚拟VIP地址 192.168.100.222

[root@master1 ~]# ping 192.168.100.222
PING 192.168.100.222 (192.168.100.222) 56(84) bytes of data.
64 bytes from 192.168.100.222: icmp_seq=1 ttl=64 time=0.049 ms
64 bytes from 192.168.100.222: icmp_seq=2 ttl=64 time=0.071 ms

停止master1的keepalived 看是否虚拟VPN IP地址会飘在master2上（master2显示虚拟IP代表成功）

[root@master1 ~]# systemctl stop keepalived.service

[root@master2 ~]# ip ad
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:d6:4e:c4 brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.11/24 brd 192.168.100.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.100.222/24 scope global secondary ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::137d:5b9f:cc00:a088/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::b7a5:7adc:7fdc:77af/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 02:42:62:5f:61:42 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
[root@master2 ~]#

四集群初始化

生成默认kubeadm-config.yaml 文件

kubeadm config print init-defaults --kubeconfig ClusterConfiguration > kubeadm-config.yaml 
[root@master1 ~]# kubeadm config print init-defaults --kubeconfig ClusterConfiguration > kubeadm-config.yaml 
[root@master1 ~]# ls
anaconda-ks.cfg  kubeadm-config.yaml

也可以自己创建kubeadm-config.yaml 文件，我这里选择自己创建kubeadm-config.yaml

[root@master1 ~]#cat kubeadm-config.yaml 
apiVersion: kubeadm.k8s.io/v1beta2    
kind: ClusterConfiguration            
kubernetesVersion: v1.23.6                ##更改k8s版本号
imageRepository: registry.aliyuncs.com/google_containers    ##更改国内镜像源    
controlPlaneEndpoint: 192.168.100.222:16443                ##虚拟VIP地址+端口         
apiServer:                         
 certSANs:
 - 192.168.100.222               ###添加虚拟VIP地址
networking:
 podSubnet: 10.244.0.0/16        # pod 的网段
 serviceSubnet: 10.10.0.0/16     #service网段
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind:  KubeProxyConfiguration
mode: ipvs                      ##开启ipvs

传kubeadm-config.yaml 给其他master节点

[root@master1 ~]# scp kubeadm-config.yaml  master2:~
kubeadm-config.yaml                                                    100%  499   366.2KB/s   00:00

所有Master节点提前下载镜像（master1和master2都要下载）

[root@master1 ~]# kubeadm config images pull  --config kubeadm-config.yaml 
[config/images] Pulled registry.aliyuncs.com/google_containers/kube-apiserver:v1.23.6
[config/images] Pulled registry.aliyuncs.com/google_containers/kube-controller-manager:v1.23.6
[config/images] Pulled registry.aliyuncs.com/google_containers/kube-scheduler:v1.23.6
[config/images] Pulled registry.aliyuncs.com/google_containers/kube-proxy:v1.23.6
[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
[root@master1 ~]#

初始化集群

root@master1 ~]# kubeadm init --config  kubeadm-config.yaml 
[init] Using Kubernetes version: v1.23.6
[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 [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master1] and IPs [10.10.0.1 192.168.100.10 192.168.100.222]
[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 [localhost master1] and IPs [192.168.100.10 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master1] and IPs [192.168.100.10 127.0.0.1 ::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"
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "admin.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[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 24.637002 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 master1 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 master1 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: h2nq1b.g17bz2b8ofyemnxo
[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
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[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/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo \
	--discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3 \
	--control-plane 

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

kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo \
	--discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3

初始化成功以后，会产生Token值，用于其他节点加入时使用

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/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo \
	--discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3 \
	--control-plane   ##用于加入master2节点

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

kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo \
	--discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3  
##用于加入node节点

温馨提示如果出现集群初始化出错可重置再初始化

[root@master1 ~]#  kubeadm reset -f   ##重置k8s初始化

配置环境变量

[root@master1 ~]# mkdir -p $HOME/.kube
[root@master1 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@master1 ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source  ~/.bash_profile

# 临时生效（退出当前窗口重连环境变量失效）
export KUBECONFIG=/etc/kubernetes/admin.conf
# 永久生效（推荐）
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile
source  ~/.bash_profile

查看节点状态：

[root@master1 ~]# kubectl get nodes
NAME      STATUS     ROLES                  AGE   VERSION
master1   NotReady   control-plane,master   48m   v1.23.6
[root@master1 ~]#

所有的系统组件均以容器的方式运行并且在kube-system命名空间内，此时可以查看Pod状态

[root@master1 ~]# kubectl get pods -n kube-system -o wide
NAME                              READY   STATUS    RESTARTS   AGE   IP               NODE      NOMINATED NODE   READINESS GATES
coredns-6d8c4cb4d-hbtm5           0/1     Pending   0          49m   <none>           <none>    <none>           <none>
coredns-6d8c4cb4d-n5dcp           0/1     Pending   0          49m   <none>           <none>    <none>           <none>
etcd-master1                      1/1     Running   0          49m   192.168.100.10   master1   <none>           <none>
kube-apiserver-master1            1/1     Running   0          49m   192.168.100.10   master1   <none>           <none>
kube-controller-manager-master1   1/1     Running   0          49m   192.168.100.10   master1   <none>           <none>
kube-proxy-9p7cq                  1/1     Running   0          49m   192.168.100.10   master1   <none>           <none>
kube-scheduler-master1            1/1     Running   0          49m   192.168.100.10   master1   <none>           <none>
[root@master1 ~]#

在要加入集群的节点执行以下命令

在master2节点创建
[root@master2 ~]# mkdir -p /etc/kubernetes/pki/etcd

在master1主节点将证书传给其他主节点
[root@master1 ~]# scp /etc/kubernetes/pki/ca.* master2:/etc/kubernetes/pki/
ca.crt                                                                                          100% 1099   509.4KB/s   00:00    
ca.key                                                                                          100% 1679   456.7KB/s   00:00    
[root@master1 ~]# scp /etc/kubernetes/pki/sa.* master2:/etc/kubernetes/pki/
sa.key                                                                                          100% 1679   728.6KB/s   00:00    
sa.pub                                                                                          100%  451   160.0KB/s   00:00    
[root@master1 ~]# scp /etc/kubernetes/pki/front-proxy-ca.* master2:/etc/kubernetes/pki/
front-proxy-ca.crt                                                                              100% 1115     1.0MB/s   00:00    
front-proxy-ca.key                                                                              100% 1675   685.3KB/s   00:00    
[root@master1 ~]# scp /etc/kubernetes/pki/etcd/ca.* master2:/etc/kubernetes/pki/etcd/
ca.crt                                                                                          100% 1086   804.4KB/s   00:00    
ca.key                                                                                          100% 1679   862.5KB/s   00:00    
[root@master1 ~]# scp /etc/kubernetes/admin.conf master2:/etc/kubernetes/
admin.conf                                                                                      100% 5644     2.1MB/s   00:00    
[root@master1 ~]# scp /etc/kubernetes/admin.conf node1:/etc/kubernetes/
admin.conf                                                                                     100% 5644     2.7MB/s   00:00    
[root@master1 ~]#

添加其他主节点 master2，执行以下命令

[root@master2]# kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo --discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3 --control-plane 
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[preflight] Running pre-flight checks before initializing the new control plane instance
[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 "apiserver-kubelet-client" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local master2] and IPs [10.10.0.1 192.168.100.11 192.168.100.222]
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [localhost master2] and IPs [192.168.100.11 127.0.0.1 ::1]
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [localhost master2] and IPs [192.168.100.11 127.0.0.1 ::1]
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[certs] Using the existing "sa" key
[kubeconfig] Generating kubeconfig files
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Using existing kubeconfig file: "/etc/kubernetes/admin.conf"
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[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"
[check-etcd] Checking that the etcd cluster is healthy
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
[etcd] Announced new etcd member joining to the existing etcd cluster
[etcd] Creating static Pod manifest for "etcd"
[etcd] Waiting for the new etcd member to join the cluster. This can take up to 40s
The 'update-status' phase is deprecated and will be removed in a future release. Currently it performs no operation
[mark-control-plane] Marking the node master2 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 master2 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]

This node has joined the cluster and a new control plane instance was created:

* Certificate signing request was sent to apiserver and approval was received.
* The Kubelet was informed of the new secure connection details.
* Control plane (master) label and taint were applied to the new node.
* The Kubernetes control plane instances scaled up.
* A new etcd member was added to the local/stacked etcd cluster.

To start administering your cluster from this node, 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

Run 'kubectl get nodes' to see this node join the cluster.

[root@master2]#

如果遇到kubeadm init报错10248不健康

遇见这样问题
[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.
[kubelet-check] It seems like the kubelet isn't running or healthy.


Docker是用yum安装的，docker的cgroup驱动程序默认设置为systemd。默认情况下Kubernetes cgroup为system，我们需要更改Docker cgroup驱动



解决方法
# 添加以下内容
vim /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}

# 重启docker
systemctl restart docker
# 重新初始化
kubeadm reset -f  # 先重置

node节点加入集群执行以下命令

kubeadm join 192.168.100.222:16443 --token h2nq1b.g17bz2b8ofyemnxo \
	--discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3

但是，执行过程中出现了报错现象，控制台报错，内容如下：

error execution phase preflight: couldn't validate the identity of the API Server: invalid discovery token CA certificate hash: invalid hash "sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d22ad3", expected a 32 byte SHA-256 hash, found 27 bytes

通过分析得知，根本原因：Token信息过期

解决方式

在Master节点使用kubeadm生成新的token信息

kubeadm token create --print-join-command

[root@master1 ~]# kubeadm token create --print-join-command
kubeadm join 192.168.100.222:16443 --token rrf6hc.jr2o31u7xu84hctt --discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3

node节点添加成功

[root@node1 ~]# kubeadm token create --print-join-command
kubeadm join 192.168.100.222:16443 --token 82121p.6n68y99mgmr8daps --discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3 
[root@node1 ~]# kubeadm join 192.168.100.222:16443 --token rrf6hc.jr2o31u7xu84hctt --discovery-token-ca-cert-hash sha256:8e8791621a3ad873547facdc62c8de731b020dbcf28a8f841d12793979222ad3 
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

添加完成查看结果

[root@master1 ~]# kubectl get nodes
NAME      STATUS     ROLES                  AGE     VERSION
master1   NotReady   control-plane,master   109m    v1.23.6
master2   NotReady   control-plane,master   25m     v1.23.6
node1     NotReady   <none>                 8m51s   v1.23.6
node2     NotReady   <none>                 8m40s   v1.23.6

五安装网络插件

[root@master1 ~]# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

namespace/kube-flannel 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
[root@master1 ~]#

查看节点状态

[root@master1 ~]# kubectl get nodes 
NAME      STATUS   ROLES                  AGE    VERSION
master1   Ready    control-plane,master   115m   v1.23.6
master2   Ready    control-plane,master   31m    v1.23.6
node1     Ready    <none>                 15m    v1.23.6
node2     Ready    <none>                 16m    v1.23.6

如果报错显示以下内容：

The connection to the server localhost:8080 was refused - did you specify the right host or port?

问题分析：

环境变量
原因：kubernetes master没有与本机绑定，集群初始化的时候没有绑定，此时设置在本机的环境变量即可解决问题。

问题解决方法

设置环境变量
具体根据情况，linux设置该环境变量
方式一：编辑文件设置
	   vim /etc/profile
	   在底部增加新的环境变量 export KUBECONFIG=/etc/kubernetes/admin.conf
方式二:直接追加文件内容
	echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile

使生效
source /etc/profile


[root@master2 ~]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@master2 ~]# kubectl get pods -n kube-system -o wide
The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@master2 ~]# 
[root@master2 ~]# echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile
[root@master2 ~]# 
[root@master2 ~]# source /etc/profile
[root@master2 ~]# 
[root@master2 ~]# kubectl get nodes
NAME      STATUS   ROLES                  AGE    VERSION
master1   Ready    control-plane,master   120m   v1.23.6
master2   Ready    control-plane,master   36m    v1.23.6
node1     Ready    <none>                 20m    v1.23.6
node2     Ready    <none>                 22m    v1.23.6
[root@master2 ~]#

六部署k8s的dashboard

执行yaml文件直接部署 k8s与dashboard 对应版本安装

https://github.com/kubernetes/dashboard/releases?after=v2.0.0

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.5.0/aio/deploy/recommended.yaml

kubectl get pods -n kubernetes-dashboard

[root@master1 ~]# kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.5.0/aio/deploy/recommended.yaml
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created

查看dashboard运行状态，以deployment方式部署，运行2个pod及2个service

[root@master1 ~]# kubectl -n kubernetes-dashboard get pods
NAME                                        READY   STATUS    RESTARTS   AGE
dashboard-metrics-scraper-79459f84f-w8dqt   1/1     Running   0          2m49s
kubernetes-dashboard-5bd89d988-vwjsz        1/1     Running   0          2m49s
[root@master1 ~]# kubectl -n kubernetes-dashboard get svc
NAME                        TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.10.41.17    <none>        8000/TCP        117s
kubernetes-dashboard        NodePort    10.10.252.52   <none>        443/TCP         118s

使用nodeport方式将dashboard服务暴露在集群外，指定使用30443端口，可自定义：

[root@master1 ~]# kubectl  patch svc kubernetes-dashboard -n kubernetes-dashboard \
> -p '{"spec":{"type":"NodePort","ports":[{"port":443,"targetPort":8443,"nodePort":30443}]}}'
service/kubernetes-dashboard patched

查看暴露的service,已修改为nodeport类型：

[root@master1 ~]# kubectl -n kubernetes-dashboard get svc
NAME                        TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.10.41.17    <none>        8000/TCP        14m
kubernetes-dashboard        NodePort    10.10.252.52   <none>        443:30443/TCP   14m
[root@master1 ~]#

登录dashboard

浏览器访问dashboard：https://192.168.100.222:30443/#/login

K8S集群搭建(多master多node节点)

创建登录用户以及查看访问Dashboard的认证令牌

[root@master1 ~]#  kubectl create serviceaccount  dashboard-admin -n kubernetes-dashboard
serviceaccount/dashboard-admin created
[root@master1 ~]# 
[root@master1 ~]#  kubectl create clusterrolebinding  dashboard-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin
clusterrolebinding.rbac.authorization.k8s.io/dashboard-admin created
[root@master1 ~]# 
[root@master1 ~]# kubectl describe secrets -n kubernetes-dashboard $(kubectl -n kubernetes-dashboard get secret | awk '/dashboard-admin/{print $1}')
Name:         dashboard-admin-token-x6sh8
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 76f21410-6c90-46da-8042-2da110a900cc

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1099 bytes
namespace:  20 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6ImZOZ1FKLWtFS3BHVE1Bc0xJX2Y2LTFBU0ZqNmMyZUotOGRJczFES0lWX00ifQ.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.HQ8nnCcMKyIM2XoSAbWiYhPkb9fWYG1bjY_hU8ngW82CuJKkcM36QfI7Z3nApYhkj4DE3BJP_pk97Ad9kG6-XW2B2OqoRBHoFXEeG0OqH6GUSlKORoOgG6ce_PVpjW7CP5tptiTimw1eogjfWtZt5L2SFjB3ZMXwz54iLg8INWT4AzXsaBn040Ms-VFYhJ73TGu_NZPL-jioxnNQv54tRZFjkFBQm3A4u_yFyZto8X64vS8DoA8ROkqf-pklWeQRWJJuTxesZwwERaLZPrYXKcCaJrmrIk7MB4ZRWtsWUL6wOq-k4KbZbQSSp7ydx5rXNHUeWvRa05WgkFIN-zdy0A
[root@master1 ~]#

把获取到的Token复制到登录界面的Token输入框中，登陆成功

K8S集群搭建(多master多node节点) 文章来源地址https://www.toymoban.com/news/detail-459498.html

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K8S集群搭建(多master多node节点)

一 部署环境

关闭防火墙

设置主机名hostname，管理节点设置主机名为 master

配置hosts主机名解析

配置免密登陆

关闭交换分区

配置内核参数，将桥接的IPv4流量传递到iptables的链

开启ipvs

二 配置软件源

升级centos系统内核

配置时间同步

安装docker服务以及K8S

查看docker服务和K8S服务是否起来

配置docker加速

三 通过keepalived+nginx 实现k8s apiserver节点高可用

安装nginx和keepalived主备

修改nginx配置文件，主备配置文件是一样的

keepalived配置 Master1

keepalived配置 Master2

查看IP地址 出现192.168.100.222/24虚拟VIP地址

ping 虚拟VIP地址 192.168.100.222

四 集群初始化

生成默认kubeadm-config.yaml 文件

传kubeadm-config.yaml 给其他master节点

所有Master节点提前下载镜像（master1和master2都要下载）

初始化集群

初始化成功以后，会产生Token值，用于其他节点加入时使用

配置环境变量

查看节点状态：

所有的系统组件均以容器的方式运行并且在kube-system命名空间内，此时可以查看Pod状态

在要加入集群的节点执行以下命令

添加其他主节点 master2，执行以下命令

如果遇到kubeadm init报错10248不健康

node节点加入集群执行以下命令

解决方式

node节点添加成功

添加完成查看结果

五 安装网络插件

查看节点状态

如果报错显示以下内容：

六 部署k8s的dashboard

执行yaml文件直接部署 k8s与dashboard 对应版本安装

查看dashboard运行状态，以deployment方式部署，运行2个pod及2个service

查看暴露的service,已修改为nodeport类型：

登录dashboard

创建登录用户 以及查看访问Dashboard的认证令牌

把获取到的Token复制到登录界面的Token输入框中，登陆成功

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一部署环境

二配置软件源

三通过keepalived+nginx 实现k8s apiserver节点高可用

查看IP地址出现192.168.100.222/24虚拟VIP地址

四集群初始化

五安装网络插件

六部署k8s的dashboard

创建登录用户以及查看访问Dashboard的认证令牌