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04. Kubernetes安装篇-Kuberadm

时间：2024-07-20 13:29:26浏览次数：21  
标签：Kubernetes 04 -- keepalived etc master k8s 节点 Kuberadm

架构解析

高可用架构图

组件用途

  • Etcd Cluster
    • ectd是一个键值数据库，主要存放Kubernetes数据，如创建的资源、变更的操作等；
  • Master
    • Kubernetes中的控制节点，主要用于控制Kubernetes集群；
  • Node
    • Kubernetes中的工作节点，主要用于运行Kubernetes集群部署的Pod；
  • Kube-APIServer
    • Kubernetes中的控制组件，Kubernetes集群中所有流量都会经过Kube-APIServer；
  • ControllerManager
    • Kubernetes中的控制组件，主要用于监控Kubernetes集群的状态；
  • Scheduler
    • Kubernetes中的调度组件，主要用于控制Kubernetes集群中的Pod调度到哪个Node节点去运行；
  • Load Balancer
    • Kubernetes中各个节点直接负载均衡器，一般使用keepailved和haproxy组合实现负责均衡；
  • Kubelet
    • Kubernetes中的代理组件，主要用于保证Kubernetes集群中的Pod运行状态；
  • Kube-Proxy
    • Kubernetes中的网络代理组件，主要用于保证Kubernetes集群中的Pod访问控制；

部署集群

主机规划

主机名称主机地址主机资源安装组件主机用途
k8s-master-01192.168.23.1392C4G；200Ghaproxy+keepalived+ectd+Kubernetes-Master集群管理节点
k8s-master-02192.168.23.1402C4G；200Ghaproxy+keepalived+ectd+Kubernetes-Master集群管理节点
k8s-master-03192.168.23.1412C4G；200Ghaproxy+keepalived+ectd+Kubernetes-Master集群管理节点
k8s-node-01192.168.23.1421C2G；200GKubernetes-Node集群工作节点
k8s-node-02192.168.23.1431C2G；200GKubernetes-Node集群工作节点
Vip192.168.23.100集群虚拟IP

软件规划

软件名称软件版本备注
LinuxCentOS Linux release 7.9.2009 (Core)推荐使用CentOS8版本
Kubernetes1.20.9
Kernel6.9.7-1.el7.elrepo.x86_64
Docker26.1.4
kubectl1.20.9
kubeadm1.20.9
kubelet1.20.9
haproxy1.5.18
keepalived1.3.5
kube-apiserver1.20.9
kube-controller-manager1.20.9
kube-scheduler1.20.9
kube-proxy1.20.9
coredns1.7.0
etcd3.4.13-0
pause3.2
calico/cni3.20.6
calico/pod2daemon-flexvol3.20.6
calico/node3.20.6
calico/kube-controllers3.20.6
metrics-server0.6.0
dashboard2.4.0

基础配置

配置源

所有节点都执行

  • yum源
cat > /etc/yum.repos.d/CentOS-7-ali.repo << 'EOF'
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client.  You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the 
# remarked out baseurl= line instead.
#
#
 
[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/os/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/os/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#released updates 
[updates]
name=CentOS-$releasever - Updates - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/updates/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/updates/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/$releasever/extras/$basearch/
        http://mirrors.aliyuncs.com/centos/$releasever/extras/$basearch/
        http://mirrors.cloud.aliyuncs.com/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7
 
#additional packages that extend functionality of existing packages
EOF
  • k8s源
cat > /etc/yum.repos.d/kubernetes.repo <<EOF
[kubernetes]
name = kubernetes
baseurl = https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled = 1
gpgcheck =1
gpgkey = https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg \
  https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
EOF
  • 验证源配置
yum -y install vim wget telnet

配置时间同步阿里云

所有节点都执行

  • 配置时间同步
#所有节点都要执行
yum -y install ntpdate chrony
sed -ri 's/^server/#server/g' /etc/chrony.conf
echo "server ntp.aliyun.com iburst" >> /etc/chrony.conf
systemctl start chronyd
systemctl enable chronyd
  • 配置定期同步
cat >> /var/spool/cron/root <<EOF
# rsync ali clock
*/10 * * * * /usr/sbin/ntpdate ntp.aliyun.com
EOF
  • 验证时间同步
chronyc sourcestats -v

检查并升级内核

所有节点都执行
Kubernetes集群要求Linux系统在4…18以上稳定版本，如不满足需要升级避免出现异常。

  • 检查内核版本
uname -r
  • 升级内核
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://elrepo.org/linux/elrepo/el7/x86_64/RPMS/elrepo-release-7.0-8.el7.elrepo.noarch.rpm

yum update -y --exclude=kernel* && reboot
yum --enablerepo=elrepo-kernel install kernel-ml-devel kernel-ml -y
yum --enablerepo=elrepo-kernel install kernel-lt-devel kernel-lt -y
  • 更改内核启动顺序
#查看内核的序号
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

#选择内核的序号
grub2-set-default 0
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
  • 注意：
    • 通过命令awk -F’ ‘$1=="menuentry " {print i++ " : " $2}’ /etc/grub2.cfg可以查看到可用内核，及内核的序号。
    • 通过命令grub2-set-default 0，设置新内核为默认启动的内核。
    • 通过命令grub2-mkconfig -o /boot/grub2/grub.cfg生成grub文件。
    • 通过reboot启动服务器即可。

关闭firewalld、dnsmasq、selinux、swap

所有节点都执行

  • 关闭firewalld
systemctl stop firewalld
systemctl disable firewalld

#担心防火墙策略有遗漏，所以关闭firewalld
  • 关闭dnsmasq
systemctl stop dnsmasq
systemctl disable dnsmasq
  • 关闭selinux
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
  • 关闭swap
swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab

#由于swap会影响Docker的性能，所以关闭

集群调优配置

所有节点都执行

  • /etc/security/limits.conf
cat >> /etc/security/limits.conf << EOF
* soft noproc 655350
* hard noproc 655350
* soft nofile 655350
* hard nofile 655350
EOF

#用于调整用户的系统资源限制，要求大于65535
  • /etc/sysctl.conf
#注意：内核版本4.19以上版本需要使用nf_conntrack，内核版本4.18以下版本使用nf_conntrack_ipv4
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack

cat >> /etc/sysctl.conf << EOF
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_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF

systemctl enable --now systemd-modules-load

#用于调整内核的资源限制
  • /etc/sysctl.d/k8s.conf
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv4.neigh.default.gc_stale_time = 120
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_announce = 2
net.ipv4.ip_forward = 1
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_synack_retries = 2
# 要求iptables不对bridge的数据进行处理
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-arptables = 1
net.netfilter.nf_conntrack_max = 2310720
fs.inotify.max_user_watches=89100
fs.may_detach_mounts = 1
fs.file-max = 52706963
fs.nr_open = 52706963
vm.overcommit_memory=1
# 开启OOM
vm.panic_on_oom=0
# 禁止使用 swap 空间，只有当系统 OOM 时才允许使用它
vm.swappiness=0
# ipvs优化
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 10
EOF

#用于系统调优参数配置
  • /etc/security/limits.d/k8s.conf
cat > /etc/security/limits.d/k8s.conf <<EOF
*       soft    nproc   1048576
*       hard    nproc   1048576
*       soft    nofile  1048576
*       hard    nofile  1048576
root    soft    nproc   1048576
root    hard    nproc   1048576
root    soft    nofile  1048576
root    hard    nofile  1048576
EOF

#用于文件最大打开数调优
  • /etc/rsyslog.conf
sed -ri 's/^\$ModLoad imjournal/#&/' /etc/rsyslog.conf
sed -ri 's/^\$IMJournalStateFile/#&/' /etc/rsyslog.conf

sed -ri 's/^#(DefaultLimitCORE)=/\1=100000/' /etc/systemd/system.conf
sed -ri 's/^#(DefaultLimitNOFILE)=/\1=100000/' /etc/systemd/system.conf

#用于优化日志处理，减少磁盘IO
  • /etc/ssh/sshd_config
sed -ri 's/^#(UseDNS )yes/\1no/' /etc/ssh/sshd_config

#用于ssh 连接优化

配置hostname&host

所有节点都执行

  • 配置hostname

所有节点都分别执行

hostnamectl set-hostname k8s-master-01
hostnamectl set-hostname k8s-master-02
hostnamectl set-hostname k8s-master-03
hostnamectl set-hostname k8s-node-01
hostnamectl set-hostname k8s-node-02
  • 配置host
cat >> /etc/hosts << EOF
192.168.23.139 k8s-master-01
192.168.23.140 k8s-master-02
192.168.23.141 k8s-master-03
192.168.23.142 k8s-node-01
192.168.23.143 k8s-node-02
EOF
  • 验证解析
ping  k8s-master-01
ping  k8s-master-02
ping  k8s-master-03
ping  k8s-node-01
ping  k8s-node-02

基础组件

所有节点都执行

基本组件安装–ipvs模块

modprobe ip_vs
modprobe ip_vs_rr
modprobe ip_vs_wrr
modprobe ip_vs_sh
modprobe nf_conntrack

基本组件安装–Docker

  • 安装依赖
yum install -y yum-utils
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
  • 安装Docker
yum -y install docker-ce docker-ce-cli containerd.io docker-compose-plugin
  • 配置Docker
mkdir /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": [
    "https://11777p0c.mirror.aliyuncs.com",
    "https://hub-mirror.c.163.com",
    "https://mirror.baidubce.com",
    "https://docker.m.daocloud.io",
    "https://docker.1panel.live"
  ],
  "dns": [
    "8.8.8.8",
    "114.114.114.114"
  ],
  "log-driver": "json-file",
  "log-opts": {
    "max-file": "10",
    "max-size": "100m"
  },
  "storage-driver": "overlay2",
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
  • 启动Docker
systemctl enable --now docker
systemctl enable --now containerd
  • 查看版本
docker version
  • 命令补全
yum install -y bash-completion
#安装完成之后重新登录shell或者重启系统即可
  • 注意

docker版本选择参考https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/，如果对应k8s版本没有docker版本信息，则去上一个版本查找。

基本组件安装–kubelet、kubeadm、kubectl

  • 查看可用版本
yum list kubeadm.x86_64 --showduplicates | sort -r
  • 安装组件
yum -y install kubelet-1.20.9 kubeadm-1.20.9 kubectl-1.20.9
  • 检查版本
kubeadm version
kubectl version
kubelet --version
  • 启动组件
systemctl daemon-reload
systemctl enable --now kubelet
  • 命令补全
yum -y install bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc

高可用组件

Master节点安装

高可用组件安装–haproxy

  • 安装haproxy
yum -y install haproxy
  • 配置haproxy
cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg_`date +%F`

#定义主机名称和IP地址
HOST_NAME_1=k8s-master-01
HOST_IP_1=192.168.23.139
HOST_NAME_2=k8s-master-02
HOST_IP_2=192.168.23.140
HOST_NAME_3=k8s-master-03
HOST_IP_3=192.168.23.141

cat > /etc/haproxy/haproxy.cfg << EOF
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

#haproxy监控检测
frontend monitor-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

#haproxy状态检测
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

#kubernetes代理配置
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

#kubernetes后端配置
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 $HOST_NAME_1 $HOST_IP_1:6443 check
  server $HOST_NAME_2 $HOST_IP_2:6443 check
  server $HOST_NAME_3 $HOST_IP_3:6443 check
EOF
  • 启动haproxy
systemctl enable --now haproxy

高可用组件安装–keepalived

  • 安装keepalived
yum -y install keepalived
  • 配置keepalived配置健康检查脚本
mkdir -p /etc/keepalived/script

cat > /etc/keepalived/script/check_apiserver.sh << "EOF"
!#/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
EOF
  • 配置keepalived（仅k8s-master-01执行）
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_`date +%F`

HOST_IP=$(ip addr | grep dynamic | awk -F' ' '{print $2}' | awk -F'/' '{print $1}')
HOST_VIP=192.168.23.100
INTERFACE=ens32
TYPES=MASTER

cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived

global_defs {
  router_id LVS_DEVEL
}

vrrp_script chk_apiserver {
  script "/etc/keepalived/script/check_apiserver.sh"
  interval 2
  weight -5
  fall 3
  rise 2
}

vrrp_instance VI_1 {
  state MASTER
  interface $INTERFACE
  mcast_src_ip $HOST_IP
  virtual_router_id 51
  priority 100
  advert_int 2
  authentication {
    auth_type PASS
    auth_pass K8SHA_KA_AUTH
  }
  virtual_ipaddress {
    $HOST_VIP
  }
#  track_script {
#    chk_apiserver
#  }
}
EOF
  • 配置keepalived（k8s-master-02和k8s-master-03执行）
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_`date +%F`

HOST_IP=$(ip addr | grep dynamic | awk -F' ' '{print $2}' | awk -F'/' '{print $1}')
HOST_VIP=192.168.23.100
INTERFACE=ens32

cat > /etc/keepalived/keepalived.conf << EOF
! Configuration File for keepalived

global_defs {
  router_id LVS_DEVEL
}

vrrp_script chk_apiserver {
  script "/etc/keepalived/script/check_apiserver.sh"
  interval 2
  weight -5
  fall 3
  rise 2
}

vrrp_instance VI_1 {
  state BACKUP
  interface $INTERFACE
  mcast_src_ip $HOST_IP
  virtual_router_id 51
  priority 100
  advert_int 2
  authentication {
    auth_type PASS
    auth_pass K8SHA_KA_AUTH
  }
  virtual_ipaddress {
    $HOST_VIP
  }
#  track_script {
#    chk_apiserver
#  }
}
EOF
  • 启动keepalived
systemctl enable --now keepalived

集群部署

初始化文件

Master节点执行

  • 默认配置文件

kubeadm-config.yaml

  • 生成kubeadm文件
kubeadm config print init-defaults --component-configs \
KubeProxyConfiguration,KubeletConfiguration > kubeadm-config.yaml

# 查看所需镜像
kubeadm config images list --config kubeadm-config.yaml
  • 编辑镜像下载文件
cat > ./images_kube.sh << 'EOF'
#!/bin/bash
images=(
kube-apiserver:v1.20.0
kube-controller-manager:v1.20.0
kube-scheduler:v1.20.0
kube-proxy:v1.20.0
coredns:1.7.0
etcd:3.4.13-0
pause:3.2
)
for imageName in ${images[@]} ; do
docker pull registry.aliyuncs.com/google_containers/$imageName
done
EOF
  • 下载安装镜像
chmod +x ./images.sh && ./images.sh

初始化集群

仅k8s-master-01操作
初始化k8s-master-01节点后，会在/etc/kubernetes目录下生成对应的证书和配置。最后将其他master节点、node节点加入到k8s-master-01即可。

kubeadm init \
--apiserver-advertise-address=192.168.23.139 \
--control-plane-endpoint=k8s-master-01 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.20.9 \
--service-cidr=10.96.0.0/16 \
--pod-network-cidr=83.12.0.0/16

如果初始化失败，需要重置后再初始化

#初始化重置命令
kubeadm reset

节点管理

添加master节点

  • 创建令牌

仅k8s-master-01节点执行

#生成token
kubeadm token create --print-join-command

#生成key
kubeadm init phase upload-certs --upload-certs
  • 添加节点

k8s-master-02和k8s-master-03节点执行
根据生成的令牌组合成添加master的命令，并在k8s-master-02和k8s-master-03节点上执行

kubeadm join k8s-master-01:6443 --token xpeers.u6ok4v3ju2oaq25t \
--discovery-token-ca-cert-hash sha256:137e28cb3a7be99914bc8ec2ce83c269dc724768c5cb6e3e06700c4494e6afad \
--control-plane --certificate-key fc56a938a45bf445b69458b1afb5ac9aaa66fabbd5c3414db6696a8fdb51ff2d

添加worker节点

  • 创建令牌

仅k8s-master-01节点执行

#生成token
kubeadm token create --print-join-command
  • 添加节点

k8s-node-01和k8s-node-02节点执行
根据生成的令牌添加worker，并在k8s-node-01和k8s-node-02节点上执行

kubeadm join k8s-master-01:6443 --token lx60mi.isnids1u0qlmybv7 \
--discovery-token-ca-cert-hash sha256:799108e2b9f6fe87aa1af2e4bf3ddc22b379e2ed35dd7b82ddbc3a433d1d976a

设置control节点

Master节点都执行

  • 设置管理节点
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
  • 设置环境变量
cat >> /root/.bashrc << EOF
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF

source /root/.bashrc
  • 查看所有节点
kubectl get nodes

# NAME            STATUS     ROLES                  AGE     VERSION
# k8s-master-01   NotReady   control-plane,master   13m     v1.20.9
# k8s-master-02   NotReady   <none>                 93s     v1.20.9
# k8s-master-03   NotReady   control-plane,master   6m1s    v1.20.9
# k8s-node-01     NotReady   <none>                 6m52s   v1.20.9
# k8s-node-02     NotReady   <none>                 6m40s   v1.20.9

各个节点NotReady的原因是没有安装网络插件。网络插件有：flannel、calico、canal、kube-router、weave net等，这里使用calico网络插件。

删除节点

  • 格式
kubectl delete nodes 节点名称
  • 举例
kubectl delete nodes k8s-node-01

核心组件

仅k8s-master-01节点执行

核心组件安装–calico

安装时间较长，需要耐心等待

  • 下载calico安装文件
curl -O https://docs.projectcalico.org/v3.20/manifests/calico.yaml
  • calico默认文件

calico-v3_20.yaml

  • 安装calico
kubectl apply -f ./calico.yaml
  • 检查calico
kubectl get -n kube-system pod | grep calico

其他组件

仅k8s-master-01节点执行（用不着可以不安装）

其他组件安装–metrics-server

  • 下载metrics-server安装文件
wget -O /root/install_k8s/metrics-server-v0.6.0.yaml \
  https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.6.0/components.yaml
  • metrics-server默认文件

metrics-server-v0_4_3.yaml

  • 安装metrics-server

如果镜像地址下载失败，可以尝试使用镜像地址：registry.aliyuncs.com/google_containers/metrics-server:v0.6.0

kubectl apply -f ./metrics-server-v0.6.0.yaml
  • 检查metrics-server
kubectl top nodes

其他组件安装–dashboard

  • 下载dashboard安装文件
wget -O dashboard-v2.4.0.yaml https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml
  • 默认配置文件

dashboard-v2_4_0.yaml

  • 配置dashboard文件
# 使用 NodePort
sed -i '39a\  type: NodePort' dashboard-v2.4.0.yaml
sed -i '43a\      nodePort: 30443' dashboard-v2.4.0.yaml

# 使用 LoadBalancer
sed -i '39a\  type: LoadBalancer' dashboard-v2.4.0.yaml

# 创建自定义证书时需要
sed -i '48,58d' dashboard-v2.4.0.yaml 

# 镜像拉取策略
sed -i '/imagePullPolicy/s@Always@IfNotPresent@' dashboard-v2.4.0.yaml
  • 安装dashboard
kubectl apply -f dashboard-v2.4.0.yaml
  • 查看dashboard访问端口
kubectl get svc -A |grep kubernetes-dashboard
  • 创建dashboard账号
cat > /root/install_k8s/dash.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
EOF

kubectl apply -f /root/install_k8s/dash.yaml
  • 获取访问令牌
kubectl -n kubernetes-dashboard get secret $(kubectl -n kubernetes-dashboard get sa/admin-user -o jsonpath="{.secrets[0].name}") -o go-template="{{.data.token | base64decode}}"

验证集群

查看集群中所有容器

查看集群中所有容器是否启动

kubectl get pod --all-namespaces

查看集群中主要Service

  • 查看Cluster的Service
kubectl get service
  • 查看DNS的Service
kubectl get service -n kube-system

查看集群中节点网络是否通

  • 查看集群中pod运行节点
kubectl get pod --all-namespaces -owide
  • ping测试任意ip地址
ping 83.12.151.130

查看集群中所有节点状态

kubectl get nodes

标签：Kubernetes,04,--,keepalived,etc,master,k8s,节点,Kuberadm
From： https://blog.csdn.net/weixin_40901913/article/details/140569884

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