kubeadmin 安装k8s1.20集群+kuboard-v3部署实操

系统/运维 0 1419

舞动的程序 2021年7月7日 13:16 发表

一：k8s1.20.x 的重要更新

1、Kubectl debug 设置一个临时容器
2、Sidecar 
3、Volume：更改目录权限，fsGroup
4、ConfigMap和Secret

K8S官网：https://kubernetes.io/docs/setup/
最新版高可用安装：https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

二：k8s1.20.x 的安装

2.1 ：高可用Kubernetes集群规划

k8s 的高可用的架构图

所有节点配置hosts，修改/etc/hosts如下：
cat /etc/hosts 
----
192.168.100.11  node01.flyfish.cn
192.168.100.12  node02.flyfish.cn
192.168.100.13  node03.flyfish.cn
192.168.100.14  node04.flyfish.cn
192.168.100.15  node05.flyfish.cn
192.168.100.16  node06.flyfish.cn
192.168.100.17  node07.flyfish.cn
192.168.100.18  node08.flyfish.cn
----

2.2 yum 的更新配置（所有节点全部安装）

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://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=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
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

必备工具安装:
      yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git -y

所有节点关闭防火墙、selinux、dnsmasq、swap。服务器配置如下：

systemctl disable --now firewalld 
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager

setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config

关闭swap分区 (全部节点)
     swapoff -a && sysctl -w vm.swappiness=0
     sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

安装ntpdate

rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y
所有节点同步时间。时间同步配置如下：

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com
加入到crontab

*/5 * * * * ntpdate time2.aliyun.com
所有节点配置limit：

ulimit -SHn 65535

vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited

安装ntpdate

rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y
所有节点同步时间。时间同步配置如下：

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com
加入到crontab

*/5 * * * * ntpdate time2.aliyun.com
所有节点配置limit：

ulimit -SHn 65535

vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
Master01节点免密钥登录其他节点：

ssh-keygen -t rsa
for i in k8s-master01.flyfish.cn k8s-master02.flyfish.cn k8s-master03.flyfish.cn k8s-node01.flyfish.cn k8s-node02.flyfish.cn;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

所有节点升级系统并重启：

yum update -y  && reboot

下载安装源码文件：
    cd /root/ ; git clone https://github.com/dotbalo/k8s-ha-install.git

CentOS 7安装yum源如下：
        curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://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=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
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

CentOS 8 安装源如下：
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://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=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
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

所有节点升级系统并重启，此处升级没有升级内核，下节会单独升级内核：
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 -y
yum update -y --exclude=kernel* && reboot #CentOS7需要升级，8不需要

1.1.2  内核配置
CentOS7 需要升级内核至4.18+
https://www.kernel.org/ 和 https://elrepo.org/linux/kernel/el7/x86_64/

CentOS 7 dnf可能无法安装内核
dnf --disablerepo=\* --enablerepo=elrepo -y install kernel-ml kernel-ml-devel
grubby --default-kernel


使用如下方式安装最新版内核
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

查看最新版内核yum --disablerepo="*" --enablerepo="elrepo-kernel" list available

[root@k8s-node01 ~]# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * elrepo-kernel: mirrors.neusoft.edu.cn
elrepo-kernel                                                                                  | 2.9 kB  00:00:00     
elrepo-kernel/primary_db                                                                       | 1.9 MB  00:00:00     
Available Packages
elrepo-release.noarch                                      7.0-5.el7.elrepo                              elrepo-kernel
kernel-lt.x86_64                                           4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-devel.x86_64                                     4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-doc.noarch                                       4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-headers.x86_64                                   4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-tools.x86_64                                     4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-tools-libs.x86_64                                4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-lt-tools-libs-devel.x86_64                          4.4.229-1.el7.elrepo                          elrepo-kernel
kernel-ml.x86_64                                           5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-devel.x86_64                                     5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-doc.noarch                                       5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-headers.x86_64                                   5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-tools.x86_64                                     5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-tools-libs.x86_64                                5.7.7-1.el7.elrepo                            elrepo-kernel
kernel-ml-tools-libs-devel.x86_64                          5.7.7-1.el7.elrepo                            elrepo-kernel
perf.x86_64                                                5.7.7-1.el7.elrepo                            elrepo-kernel
python-perf.x86_64                                         5.7.7-1.el7.elrepo                            elrepo-kernel

安装最新版：
yum --enablerepo=elrepo-kernel install kernel-ml kernel-ml-devel –y
安装完成后reboot
更改内核顺序：
grub2-set-default  0 && grub2-mkconfig -o /etc/grub2.cfg && grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)" && reboot
开机后查看内核
[appadmin@k8s-node01 ~]$ uname -a
Linux k8s-node01 5.7.7-1.el7.elrepo.x86_64 #1 SMP Wed Jul 1 11:53:16 EDT 2020 x86_64 x86_64 x86_64 GNU/Linux

CentOS 8按需升级:
可以采用dnf升级，也可使用上述同样步骤升级（使用上述步骤注意elrepo-release-8.1版本）
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
dnf install https://www.elrepo.org/elrepo-release-8.1-1.el8.elrepo.noarch.rpm


dnf --disablerepo=\* --enablerepo=elrepo -y install kernel-ml kernel-ml-devel
grubby --default-kernel && reboot

安装依赖包：
    本所有节点安装ipvsadm：
yum install ipvsadm ipset sysstat conntrack libseccomp -y
所有节点配置ipvs模块，在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack，本例安装的内核为4.18，使用nf_conntrack_ipv4即可：
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack_ipv4
cat /etc/modules-load.d/ipvs.conf 
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack_ipv4
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
然后执行systemctl enable --now systemd-modules-load.service即可

开启一些k8s集群中必须的内核参数，所有节点配置k8s内核：
    cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720

net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system

1.1.3  基本组件安装
本节主要安装的是集群中用到的各种组件，比如Docker-ce、Kubernetes各组件等。
查看可用docker-ce版本：
yum list docker-ce.x86_64 --showduplicates | sort -r
[root@k8s-master01 k8s-ha-install]# wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.13-3.2.el7.x86_64.rpm 

安装 docker-ce 19.03  版本：

yum install -y docker-ce-cli-19.03.8-3.el7.x86_64 docker-ce-19.03.8-3.el7.x86_64

温馨提示：
由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

启动docker 

service docker start
chkconfig docker on

安装k8s组件：
yum list kubeadm.x86_64 --showduplicates | sort -r
	所有节点安装最新版本kubeadm：
yum install kubeadm -y
所有节点安装指定版本k8s组件：
yum install -y kubeadm-1.20.5-0.x86_64 kubectl-1.20.5-0.x86_64 kubelet-1.20.5-0.x86_64
所有节点设置开机自启动Docker：
systemctl daemon-reload && systemctl enable --now docker
默认配置的pause镜像使用gcr.io仓库，国内可能无法访问，所以这里配置Kubelet使用阿里云的pause镜像：

DOCKER_CGROUPS=$(docker info | grep 'Cgroup' | cut -d' ' -f4)
cat >/etc/sysconfig/kubelet<<EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=$DOCKER_CGROUPS --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
EOF

–

设置Kubelet开机自启动：
systemctl daemon-reload
systemctl enable --now kubelet

1.1.4  高可用组件安装
所有Master节点通过yum安装HAProxy和KeepAlived：
yum install keepalived haproxy -y

所有Master节点配置HAProxy（详细配置参考HAProxy文档，所有Master节点的HAProxy配置相同）：
[root@k8s-master01 etc]# mkdir /etc/haproxy
[root@k8s-master01 etc]# vim /etc/haproxy/haproxy.cfg 
global
  maxconn  2000
  ulimit-n  16384
  log  127.0.0.1 local0 err
  stats timeout 30s

defaults
  log global
  mode  http
  option  httplog
  timeout connect 5000
  timeout client  50000
  timeout server  50000
  timeout http-request 15s
  timeout http-keep-alive 15s

frontend monitor-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

listen stats
  bind    *:8006
  mode    http
  stats   enable
  stats   hide-version
  stats   uri       /stats
  stats   refresh   30s
  stats   realm     Haproxy\ Statistics
  stats   auth      admin:admin

frontend k8s-master
  bind 0.0.0.0:16443
  bind 127.0.0.1:16443
  mode tcp
  option tcplog
  tcp-request inspect-delay 5s
  default_backend k8s-master

backend k8s-master
  mode tcp
  option tcplog
  option tcp-check
  balance roundrobin
  default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
  server node01.flyfish.cn      192.168.100.11:6443  check
  server node02.flyfish.cn      192.168.100.12:6443  check
  server node03.flyfish.cn      192.168.100.13:6443  check
  
  ----
  
  三台机器的配置是一样的：
  
  scp  haproxy.cfg root@node02.flyfish.cn:/etc/haproxy/
  scp  haproxy.cfg root@node03.flyfish.cn:/etc/haproxy/

Master01节点的配置：
[root@k8s-master01 etc]# mkdir /etc/keepalived

[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 2
    weight -5
    fall 3  
    rise 2
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    mcast_src_ip 192.168.100.11
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.100.200
    }
    track_script {
       chk_apiserver
    }
}

Master02节点的配置：
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 2
    weight -5
    fall 3  
    rise 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    mcast_src_ip 192.168.100.12
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.100.200
    }
    track_script {
       chk_apiserver
    }
}

Master03节点的配置：
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 2
    weight -5
    fall 3  
    rise 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    mcast_src_ip 192.168.100.13
    virtual_router_id 51
    priority 102
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.100.200
    }
    track_script {
       chk_apiserver
    }
}

注意上述的健康检查是关闭的，集群建立完成后再开启：
    track_script {
       chk_apiserver
    }

配置KeepAlived健康检查文件：
[root@k8s-master01 keepalived]# cat /etc/keepalived/check_apiserver.sh 
#!/bin/bash

err=0
for k in $(seq 1 5)
do
    check_code=$(pgrep kube-apiserver)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 5
        continue
    else
        err=0
        break
    fi
done

if [[ $err != "0" ]]; then
    echo "systemctl stop keepalived"
    /usr/bin/systemctl stop keepalived
    exit 1
else
    exit 0
fi

启动haproxy和keepalived (所有master 启动)
[root@k8s-master01 keepalived]# systemctl enable --now haproxy
[root@k8s-master01 keepalived]# systemctl enable --now keepalived

集群初始化：

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

各Master节点的kubeadm-config.yaml配置文件如下：
Master01：
daocloud.io/daocloud
-----
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: 7t2weq.bjbawausm0jaxury
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.100.11
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: node01.flyfish.cn
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  certSANs:
  - 192.168.100.200
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 192.168.100.200:16443
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.20.5
networking:
  dnsDomain: cluster.local
  podSubnet: 172.168.100.0/16
  serviceSubnet: 10.96.0.0/12
scheduler: {}
----

更新kubeadm文件
kubeadm config migrate --old-config kubeadm-config.yaml --new-config new.yaml
所有Master节点提前下载镜像，可以节省初始化时间：(master 节点)
kubeadm config images pull --config /root/new.yaml
所有节点设置开机自启动kubelet
systemctl enable --now kubelet

Master01节点初始化，初始化以后会在/etc/kubernetes目录下生成对应的证书和配置文件，之后其他Master节点加入Master01即可：
kubeadm init --config /root/kubeadm-config.yaml  --upload-certs

不用配置文件初始化：kubeadm init --control-plane-endpoint "LOAD_BALANCER_DNS:LOAD_BALANCER_PORT" --upload-certs

初始化失败报错
    error execution phase upload-config/kubelet: Error writing Crisocket information for the control-plane node: timed out waiting for the condition
To see the stack trace of this error execute with --v=5 or higher

解决方法：
       所有主机停掉kubelet 
         service kubelet stop 
         
         执行命令：

  swapoff -a && kubeadm reset  && systemctl daemon-reload && systemctl restart kubelet  && iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
   ipvsadm --clear

再次初始化：

    kubeadm init --config /root/new.yaml --upload-certs

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 the control-plane node running the following command on each as root:

  kubeadm join 192.168.100.200:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99 \
    --control-plane --certificate-key c0b3b67c42f4fe9ae2832d86f80df35ee2e7b32f945906fabe60e4ae1f4ba18f

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

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

kubeadm join 192.168.100.200:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

所有Master节点配置环境变量，用于访问Kubernetes集群：
cat <<EOF >> /root/.bashrc
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF
source /root/.bashrc
查看节点状态：
[root@k8s-master01 ~]# kubectl get nodes
NAME           STATUS     ROLES     AGE       VERSION
k8s-master01   NotReady   master    14m       v1.12.3
采用初始化安装方式，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：

其他master 加入集群：
     kubeadm join 192.168.100.200:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99 \
    --control-plane --certificate-key c0b3b67c42f4fe9ae2832d86f80df35ee2e7b32f945906fabe60e4ae1f4ba18f

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

加master节点报错
   [ERROR DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty
[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

rm -rf /var/lib/etcd

在初始化：
    kubeadm join 192.168.100.200:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99 \
    --control-plane --certificate-key c0b3b67c42f4fe9ae2832d86f80df35ee2e7b32f945906fabe60e4ae1f4ba18f

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

kubectl get node

node 节点加入：
       kubeadm join 192.168.100.200:16443 --token 7t2weq.bjbawausm0jaxury \
    --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99

Token过期后生成新的token：(集群扩容与缩容的问题)
kubeadm token create --print-join-command 
-----
kubeadm join 192.168.100.200:16443 --token p6rvkq.0joqbi5bxnd12n20     --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99

-----
Master需要生成--certificate-key
kubeadm init phase upload-certs  --upload-certs
-----
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
c97af03609a9d3c099dd07615ce170a8f0c8db368f36e10a79576f9efcc0857e
----

初始化其他master加入集群
   kubeadm join 192.168.100.200:16443 --token p6rvkq.0joqbi5bxnd12n20     --discovery-token-ca-cert-hash sha256:7263545b1a028e6217ff4e55712bf24422e6d9aeba54e76daabfc8a824ffcd99 --control-plane --certificate-key c97af03609a9d3c099dd07615ce170a8f0c8db368f36e10a79576f9efcc0857e

查看token的过期时间
    kubectl get secret -n kube-system -o wide

kubectl get secret -n kube-system bootstrap-token-q8soir -o yaml
-----
apiVersion: v1
data:
  description: UHJveHkgZm9yIG1hbmFnaW5nIFRUTCBmb3IgdGhlIGt1YmVhZG0tY2VydHMgc2VjcmV0
  expiration: MjAyMS0wMy0yNlQxODoyMzowNSswODowMA==
  token-id: cThzb2ly
  token-secret: cnZidjZwdGIxajIxbWFsZw==
kind: Secret
metadata:
  creationTimestamp: "2021-03-26T08:23:05Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        .: {}
        f:description: {}
        f:expiration: {}
        f:token-id: {}
        f:token-secret: {}
      f:type: {}
    manager: kubeadm
    operation: Update
    time: "2021-03-26T08:23:05Z"
  name: bootstrap-token-q8soir
  namespace: kube-system
  resourceVersion: "305"
  uid: eba712c8-386e-4824-802e-7a2f5cd05f0c
type: bootstrap.kubernetes.io/token
----

echo MjAyMS0wMy0yNlQxODoyMzowNSswODowMA== |base64 -d

kubectl get node

修改calico-etcd.yaml的以下位置
     cd /root/k8s-ha-install && git checkout manual-installation-v1.20.x && cd calico/
-----
sed -i 's#etcd_endpoints: "http://<ETCD_IP>:<ETCD_PORT>"#etcd_endpoints: "https://192.168.100.11:2379,https://192.168.100.12:2379,https://192.168.100.13:2379"#g' calico-etcd.yaml

ETCD_CA=`cat /etc/kubernetes/pki/etcd/ca.crt | base64 | tr -d '\n'`

ETCD_CERT=`cat /etc/kubernetes/pki/etcd/server.crt | base64 | tr -d '\n'`

ETCD_KEY=`cat /etc/kubernetes/pki/etcd/server.key | base64 | tr -d '\n'`

sed -i "s@# etcd-key: null@etcd-key: ${ETCD_KEY}@g; s@# etcd-cert: null@etcd-cert: ${ETCD_CERT}@g; s@# etcd-ca: null@etcd-ca: ${ETCD_CA}@g" calico-etcd.yaml

sed -i 's#etcd_ca: ""#etcd_ca: "/calico-secrets/etcd-ca"#g; s#etcd_cert: ""#etcd_cert: "/calico-secrets/etcd-cert"#g; s#etcd_key: "" #etcd_key: "/calico-secrets/etcd-key" #g' calico-etcd.yaml

POD_SUBNET=`cat /etc/kubernetes/manifests/kube-controller-manager.yaml | grep cluster-cidr= | awk -F= '{print $NF}'`

sed -i 's@# - name: CALICO_IPV4POOL_CIDR@- name: CALICO_IPV4POOL_CIDR@g; s@#   value: "192.168.0.0/16"@  value: '"${POD_SUBNET}"'@g' calico-etcd.yaml

-----

kubectl apply -f  calico-etcd.yaml

kubectl get node -n kue-system 

kubectl get node

配置metric server 
cd /root/k8s-ha-install/metrics-server-0.4.x-kubeadm
vim comp.ymal
----
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
    rbac.authorization.k8s.io/aggregate-to-admin: "true"
    rbac.authorization.k8s.io/aggregate-to-edit: "true"
    rbac.authorization.k8s.io/aggregate-to-view: "true"
  name: system:aggregated-metrics-reader
rules:
  - apiGroups:
      - metrics.k8s.io
    resources:
      - pods
      - nodes
    verbs:
      - get
      - list
      - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
rules:
  - apiGroups:
      - ""
    resources:
      - pods
      - nodes
      - nodes/stats
      - namespaces
      - configmaps
    verbs:
      - get
      - list
      - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server-auth-reader
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
  - kind: ServiceAccount
    name: metrics-server
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server:system:auth-delegator
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
  - kind: ServiceAccount
    name: metrics-server
    namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    k8s-app: metrics-server
  name: system:metrics-server
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:metrics-server
subjects:
  - kind: ServiceAccount
    name: metrics-server
    namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  ports:
    - name: https
      port: 443
      protocol: TCP
      targetPort: https
  selector:
    k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    k8s-app: metrics-server
  name: metrics-server
  namespace: kube-system
spec:
  selector:
    matchLabels:
      k8s-app: metrics-server
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        k8s-app: metrics-server
    spec:
      containers:
        - args:
            - --cert-dir=/tmp
            - --secure-port=4443
            - --metric-resolution=30s
            - --kubelet-insecure-tls
            - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
          #  - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt # change to front-proxy-ca.crt for kubeadm
            - --requestheader-username-headers=X-Remote-User
            - --requestheader-group-headers=X-Remote-Group
            - --requestheader-extra-headers-prefix=X-Remote-Extra-
          image: registry.cn-beijing.aliyuncs.com/dotbalo/metrics-server:v0.4.1
          imagePullPolicy: IfNotPresent
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /livez
              port: https
              scheme: HTTPS
            periodSeconds: 10
          name: metrics-server
          ports:
            - containerPort: 4443
              name: https
              protocol: TCP
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /readyz
              port: https
              scheme: HTTPS
            periodSeconds: 10
          securityContext:
            readOnlyRootFilesystem: true
            runAsNonRoot: true
            runAsUser: 1000
          volumeMounts:
            - mountPath: /tmp
              name: tmp-dir
            - name: ca-ssl
              mountPath: /etc/kubernetes/pki
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: metrics-server
      volumes:
        - emptyDir: {}
          name: tmp-dir
        - name: ca-ssl
          hostPath:
            path: /etc/kubernetes/pki
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
  labels:
    k8s-app: metrics-server
  name: v1beta1.metrics.k8s.io
spec:
  group: metrics.k8s.io
  groupPriorityMinimum: 100
  insecureSkipTLSVerify: true
  service:
    name: metrics-server
    namespace: kube-system
  version: v1beta1
  versionPriority: 100

----
kubectl apply -f comp.yaml

安装dashbaord 

cd /root/k8s-ha-install/dashboard
kubectl apply -f dashboard-user.yaml
kubectl apply -f dashboard.yaml

kubectl get pod -n kubernetes-dashboard

kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard
改一下svc 的 类型：
   type: Cluster-IP
   改为： type: NodePort

kubectl get svc -n kubernetes-dashboard -o wide

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

集群测试：
   kubectl get svc -n kube-system 
   
   telnet 10.96.0.1 443 
   telnet 10.96.0.10 53

部署kuborad 
在node 节点上面 下载镜像：
  docker pull  eipwork/kuboard:latest
  
  kubectl apply -f https://kuboard.cn/install-script/kuboard.yaml

  kubectl get pods -l k8s.kuboard.cn/name=kuboard -n kube-system
  
kubectl get svc,pod -n kube-system -o wide |grep kuboard

获取Token

# 如果您参考 www.kuboard.cn 提供的文档安装 Kuberenetes，可在第一个 Master 节点上执行此命令

echo $(kubectl -n kube-system get secret $(kubectl -n kube-system get secret | grep kuboard-user | awk '{print $1}') -o go-template='{{.data.token}}' | base64 -d)

卸载：kuborad-v2
  kubectl delete -f https://kuboard.cn/install-script/kuboard.yaml

安装kuboard-v3
在node 节点上面下载镜像：
docker pull eipwork/kuboard:v3
docker pull eipwork/etcd-host:3.4.16-1
mkdir /data
chmod 777 -R /data

配置镜像下载策略
wget https://addons.kuboard.cn/kuboard/kuboard-v3.yaml
vim kuboard-v3.ymal
---
imagePullPolicy: IfNotPresent  (共有两处)
---

kubectl apply -f kuboard-v3.yaml

访问 Kuboard
在浏览器中打开链接 http://your-node-ip-address:30080

输入初始用户名和密码，并登录

用户名： admin
密码： Kuboard123

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kubeadmin 安装k8s1.20集群+kuboard-v3部署实操

一：k8s1.20.x 的重要更新

二：k8s1.20.x 的安装

2.1 ：高可用Kubernetes集群规划

2.2 yum 的更新配置 （所有节点全部安装）

2.2 yum 的更新配置（所有节点全部安装）