OpenEuler-部署K8S高可用集群（外部etcd）

OpenEuler-部署K8S高可用集群（外部etcd）

主机拓扑

主机名 ip1（NAT） 系统 磁盘 内存
master1 192.168.48.101 OpenEuler-22.03-LTS 100G 4G
master2 192.168.48.102 OpenEuler-22.03-LTS 100G 4G
master3 192.168.48.103 OpenEuler-22.03-LTS 100G 4G
node01 192.168.48.104 OpenEuler-22.03-LTS 100G 8G

基础配置

OpenEuler通过单独安装，非克隆。安装完后进行基本环境的配置，配置一下几个方面：

  1. 设置主机名
  2. 关闭firewalld、dnsmasq、selinux
  3. 设置ens160
  4. 优化ssh
  5. 备份并新增、docker-ce源、k8s源
  6. 更新yum源软件包缓存
  7. 修改history格式及记录数
  8. 添加hosts解析
  9. 关闭swap分区
  10. 安装chrony服务，并同步时间
  11. 配置limits.conf
  12. 安装必备工具
  13. 升级系统并重启

操作主机：[master1,master2,master3,node01]

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vim k8s_system_init.sh
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#!/bin/bash
if [ $# -eq 2 ];then
  echo "设置主机名为：$1"
  echo "ens160设置IP地址为：192.168.48.$2"
else
  echo  "使用方法：sh $0 主机名 主机位"
  exit 2
fi

echo "--------------------------------------"
echo "1.正在设置主机名：$1"
hostnamectl set-hostname $1

echo "2.正在关闭firewalld、dnsmasq、selinux"
systemctl disable firewalld &> /dev/null
systemctl disable dnsmasq &> /dev/null
systemctl stop firewalld
systemctl stop dnsmasq
sed -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/selinux/config
setenforce 0


echo "3.正在设置ens160：192.168.48.$2"
cat > /etc/sysconfig/network-scripts/ifcfg-ens160 <<EOF
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=ens160
UUID=53b402ff-5865-47dd-a853-7afcd6521738
DEVICE=ens160
ONBOOT=yes
IPADDR=192.168.48.$2
GATEWAY=192.168.48.2
PREFIX=24
DNS1=192.168.48.2
DNS2=114.114.114.114

nmcli c reload
nmcli c up ens 160


echo "4.优化ssh"
sed -i "s#\#UseDNS yes#UseDNS no#g" /etc/ssh/sshd_config
sed -i "s#GSSAPIAuthentication yes#GSSAPIAuthentication no#g" /etc/ssh/sshd_config
systemctl restart sshd

echo "5.新增docker-ce源、k8s源"
mkdir /etc/yum.repos.d/bak/
cp /etc/yum.repos.d/* /etc/yum.repos.d/bak/
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=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg 
EOF

curl -o /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sed -i 's/\$releasever/7/g' /etc/yum.repos.d/docker-ce.repo

echo "6.更新yum源软件包缓存"
 yum clean all && yum makecache


echo "7.修改history格式及记录数"
sed -i "s#HISTSIZE=1000##g" /etc/profile
cat >> /etc/profile <<EOF
shopt -s histappend
USER_IP=`who -u am i 2>/dev/null| awk '{print $NF}'|sed -e 's/[()]//g'`
export HISTFILE=~/.commandline_warrior
export HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S  `whoami`@${USER_IP}: "
export HISTSIZE=200000
export HISTFILESIZE=1000000
export PROMPT_COMMAND="history -a"
EOF
source /etc/profile


echo "8.添加hosts解析"
cat > /etc/hosts <<EOF
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.48.101 master1
192.168.48.102 master2
192.168.48.103 master3
192.168.48.104 node01
192.168.48.105 node02
EOF


echo "9.关闭swap分区"
swapoff -a && sysctl -w vm.swappiness=0 &> /dev/null
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab


echo "10.安装chrony服务，并同步时间"
yum install chrony -y
systemctl start chronyd
systemctl enable chronyd
chronyc sources
chronyc sources

echo "11.配置limits.conf"
ulimit -SHn 65535
cat >> /etc/security/limits.conf <<EOF
* soft nofile 65536
* hard nofile 131072
* soft nproc 65535
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF


echo "12.必备工具安装"
yum install wget psmisc vim net-tools telnet device-mapper-persistent-data lvm2 git -y


echo "13.升级系统并重启"
yum update -y --exclude=kernel* && reboot

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sh k8s_system_init.sh 主机名 主机位
[master1] sh k8s_system_init.sh master1 101

[master2] sh k8s_system_init.sh master2 102

[master3] sh k8s_system_init.sh master3 103

[node01] sh k8s_system_init.sh node01 104

配置ssh免密

操作节点[master1]

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yum install -y sshpass 
cat > sshmianmi.sh << "EOF"
#!/bin/bash
# 目标主机列表
hosts=("master1" "master2" "master3" "node01")
# 密码
password="Lj201840."
# 生成 SSH 密钥对
ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa

# 循环遍历目标主机
for host in "${hosts[@]}"
do
    # 复制公钥到目标主机
    sshpass -p "$password" ssh-copy-id -o StrictHostKeyChecking=no "$host"
    
    # 验证免密登录
    sshpass -p "$password" ssh -o StrictHostKeyChecking=no "$host" "echo '免密登录成功'"
done
EOF

sh sshmianmi.sh

内核及ipvs模块配置

此步骤是升级内核、配置ipvs模块，开启一些k8s集群中必须的内核参数。配置一下几个方面：

  1. 更改内核启动顺序
  2. 安装ipvsadm
  3. 配置ipvs模块
  4. 开启k8s集群必须的内核参数
  5. 配置完内核，重启服务器

操作主机：[master1,master2,master3,node01]

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vi kernel_update.sh
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#!/bin/bash

echo "1.更改内核启动顺序"
grub2-set-default  0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"

echo "2.安装ipvsadm"
yum install ipvsadm ipset sysstat conntrack libseccomp -y &> /dev/null


echo "3.配置ipvs模块"
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack

cat >> /etc/modules-load.d/ipvs.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
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
systemctl enable --now systemd-modules-load.service &> /dev/null


echo "4.开启k8s集群必须的内核参数"
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
net.ipv4.conf.all.route_localnet = 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


echo "5.配置完内核，重启服务器！"
reboot

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sh kernel_update.sh

检查ipvs加载、内核版本验证

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lsmod | grep --color=auto -e ip_vs -e nf_conntrack
uname -a

image-20231201233238841

部署ETCD集群

本次在master1、master2、master3上进行etcd集群部署

安装etcd

下载安装包

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wget https://github.com/etcd-io/etcd/releases/download/v3.5.13/etcd-v3.5.13-linux-amd64.tar.gz

image-20240415172117528

解压

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tar xf etcd-v3.5.13-linux-amd64.tar.gz
mv etcd-v3.5.13-linux-amd64 /tmp/etcd
cp /tmp/etcd/etcd* /usr/local/bin/

image-20240415172055623

添加环境变量

将文件夹中etcd和etcdctl两个文件添加到环境变量中

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mkdir -p /var/lib/etcd/
mkdir -p /etc/etcd/
chmod 700 /var/lib/etcd

image-20231015012808701

创建默认配置文件

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cat <<EOF | sudo tee /etc/etcd/etcd.conf
#节点名称
ETCD_NAME=$(hostname -s)
#数据存放位置
ETCD_DATA_DIR=/var/lib/etcd
EOF

image-20231015012819394

创建etcd服务

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cat <<EOF | sudo tee /etc/systemd/system/etcd.service
 
[Unit]
Description=Etcd Server
Documentation=https://github.com/coreos/etcd
After=network.target
 
[Service]
User=root
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
ExecStart=/usr/local/bin/etcd
Restart=on-failure
RestartSec=10s
LimitNOFILE=40000
 
[Install]
WantedBy=multi-user.target
EOF

image-20231015012847141

开启服务

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systemctl daemon-reload && systemctl enable etcd && systemctl start etcd

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查看版本信息

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etcd -version

image-20231201234123720

在master1节点上生成etcd配置文件

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etcd1=192.168.48.101
etcd2=192.168.48.102
etcd3=192.168.48.103

TOKEN=smartgo
ETCDHOSTS=($etcd1 $etcd2 $etcd3)
NAMES=("master1" "master2" "master3")
for i in "${!ETCDHOSTS[@]}"; do
HOST=${ETCDHOSTS[$i]}
NAME=${NAMES[$i]}
cat << EOF > /tmp/$NAME.conf
# [member]
ETCD_NAME=$NAME
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://$HOST:2380"
ETCD_LISTEN_CLIENT_URLS="http://$HOST:2379,http://127.0.0.1:2379"
#[cluster]
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://$HOST:2380"
ETCD_INITIAL_CLUSTER="${NAMES[0]}=http://${ETCDHOSTS[0]}:2380,${NAMES[1]}=http://${ETCDHOSTS[1]}:2380,${NAMES[2]}=http://${ETCDHOSTS[2]}:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_INITIAL_CLUSTER_TOKEN="$TOKEN"
ETCD_ADVERTISE_CLIENT_URLS="http://$HOST:2379"
EOF
done
ls /tmp/master*
scp /tmp/master2.conf $etcd2:/etc/etcd/etcd.conf
scp /tmp/master3.conf $etcd3:/etc/etcd/etcd.conf
cp /tmp/master1.conf /etc/etcd/etcd.conf
rm -f /tmp/master*.conf

image-20231014195615912

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sh etcd_install.sh

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在k8s集群master节点上启动etcd

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systemctl restart etcd
systemctl enable --now etcd

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检查etcd集群是否正常

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etcdctl member list
etcdctl endpoint health

image-20231015013040955

image-20231015013053386

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高可用组件安装

haproxy配置

操作节点：[master1，master2,master3]

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yum install keepalived haproxy -y

所有Master节点配置HAProxy，所有Master节点的HAProxy配置相同。

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操作节点：[master1，master2, master3]
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

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

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 master1   192.168.48.101:6443  check
  server master2   192.168.48.102:6443  check
  server master3   192.168.48.103:6443  check
EOF

Keepalived配置

操作节点：[master1，master2,master3]

所有Master节点配置Keepalived，以下三个Master节点配置注意ip和网卡。

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操作节点：[master1]

cat >/etc/keepalived/keepalived.conf  <<"EOF"

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    mcast_src_ip 192.168.48.101
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.48.200
    }
    track_script {
       chk_apiserver
    }
}
EOF
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操作节点：[master2]
cat >/etc/keepalived/keepalived.conf  <<"EOF"

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    mcast_src_ip 192.168.48.102
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.48.200
    }
    track_script {
       chk_apiserver
    }
}
EOF
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操作节点：[master3]
cat >/etc/keepalived/keepalived.conf  <<"EOF"

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
script_user root
    enable_script_security
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 5
    weight -5
    fall 2  
rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    mcast_src_ip 192.168.48.103
    virtual_router_id 51
    priority 99
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.48.200
    }
    track_script {
       chk_apiserver
    }
}
EOF

配置Keepalived健康检查文件

操作节点：[master1，master2,master3]

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cat > /etc/keepalived/check_apiserver.sh <<"EOF"
 #!/bin/bash
 err=0
 for k in $(seq 1 3)
 do
    check_code=$(pgrep haproxy)
    if [[ $check_code == "" ]]; then
        err=$(expr $err + 1)
        sleep 1
        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

chmod +x /etc/keepalived/check_apiserver.sh

启动haproxy和keepalived

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操作节点：[master，master2,master3]
systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived

测试集群负载均衡高可用

查看master1的vip

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ip a

image-20231109232708584

模拟master1的宕机测试，看看vip会不会漂移到master2去

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[master1] poweroff

image-20231109232803276

这时候查看master2的ip列表

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[master2] poweroff

image-20231109232825999

结论：这时可以知道，负载均衡集群成功，当master1出现宕机情况，vip会从master1漂移到master2

docker安装

安装docker

操作节点[master1，master2，master3,node01]

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wget https://download.docker.com/linux/static/stable/x86_64/docker-26.0.1.tgz
tar xf docker-*.tgz
cp docker/* /usr/bin/
#创建containerd的service文件,并且启动
cat >/etc/systemd/system/containerd.service <<EOF
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target
[Service]
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/bin/containerd
Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=1048576
TasksMax=infinity
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
EOF
systemctl enable --now containerd.service

#准备docker的service文件

cat > /etc/systemd/system/docker.service <<EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket containerd.service
[Service]
Type=notify
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
StartLimitBurst=3
StartLimitInterval=60s
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
Delegate=yes
KillMode=process
OOMScoreAdjust=-500
[Install]
WantedBy=multi-user.target
EOF


#准备docker的socket文件

cat > /etc/systemd/system/docker.socket <<EOF
[Unit]
Description=Docker Socket for the API
[Socket]
ListenStream=/var/run/docker.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker
[Install]
WantedBy=sockets.target
EOF
groupadd docker

systemctl enable --now docker.socket  && systemctl enable --now docker.service


#验证
mkdir /etc/docker
cat >/etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": [
    "https://docker.mirrors.ustc.edu.cn",
    "http://hub-mirror.c.163.com"
  ],
  "max-concurrent-downloads": 10,
  "log-driver": "json-file",
  "log-level": "warn",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
    },
  "data-root": "/var/lib/docker"
}
EOF
systemctl restart docker

安装cri-docker

操作节点[master1，master2，master3,node01]

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wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.12/cri-dockerd-0.3.12.amd64.tgz

tar -zxvf cri-dockerd-0.3.12.amd64.tgz
cp cri-dockerd/cri-dockerd  /usr/bin/
chmod +x /usr/bin/cri-dockerd


#写入启动配置文件
cat >  /usr/lib/systemd/system/cri-docker.service <<EOF
[Unit]
Description=CRI Interface for Docker Application Container Engine
Documentation=https://docs.mirantis.com
After=network-online.target firewalld.service docker.service
Wants=network-online.target
Requires=cri-docker.socket
 
[Service]
Type=notify
ExecStart=/usr/bin/cri-dockerd --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.9
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
 
StartLimitBurst=3
 
StartLimitInterval=60s
 
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
 
TasksMax=infinity
Delegate=yes
KillMode=process
 
[Install]
WantedBy=multi-user.target
EOF


#写入socket配置文件
cat > /usr/lib/systemd/system/cri-docker.socket <<EOF
[Unit]
Description=CRI Docker Socket for the API
PartOf=cri-docker.service
 
[Socket]
ListenStream=%t/cri-dockerd.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker
 
[Install]
WantedBy=sockets.target
EOF

systemctl daemon-reload && systemctl enable cri-docker --now

K8S集群安装

安装k8s所需的工具

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操作节点[master1，master2，master3,node01]

yum -y install  kubeadm kubelet kubectl

#为了实现docker使用的cgroupdriver与kubelet使用的cgroup的一致性，配置如下：
sed -i 's/^KUBELET_EXTRA_ARGS=/KUBELET_EXTRA_ARGS="--cgroup-driver=systemd"/g' /etc/sysconfig/kubelet

#设置kubelet为开机自启动即可，由于没有生成配置文件，集群初始化后自动启动
systemctl enable kubelet
systemctl enable kubelet.service

初始化集群

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cat > kubeadm-config.yaml << EOF
---
apiVersion: kubeadm.k8s.io/v1beta3
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.48.101
  bindPort: 6443
nodeRegistration:
  criSocket: unix:///var/run/cri-dockerd.sock
---
apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
kubernetesVersion: 1.28.2
imageRepository: registry.aliyuncs.com/google_containers
networking:
  dnsDomain: cluster.local
  podSubnet: 10.244.0.0/16
  serviceSubnet: 10.96.0.0/12
scheduler: {}
apiServerCertSANs:
- 192.168.48.200
controlPlaneEndpoint: "192.168.48.200:16443"
etcd:
  external:
    endpoints:
      - http://192.168.48.101:2379
      - http://192.168.48.102:2379
      - http://192.168.48.103:2379
---
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
featureGates:
  # SupportIPVSProxyMode: false
mode: ipvs
---
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.crt
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 0s
    cacheUnauthorizedTTL: 0s
cgroupDriver: systemd
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
cpuManagerReconcilePeriod: 0s
evictionPressureTransitionPeriod: 0s
fileCheckFrequency: 0s
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 0s
imageMinimumGCAge: 0s
kind: KubeletConfiguration
logging:
  flushFrequency: 0
  options:
    json:
      infoBufferSize: "0"
  verbosity: 0
memorySwap: {}
nodeStatusReportFrequency: 0s
nodeStatusUpdateFrequency: 0s
rotateCertificates: true
runtimeRequestTimeout: 0s
shutdownGracePeriod: 0s
shutdownGracePeriodCriticalPods: 0s
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 0s
syncFrequency: 0s
volumeStatsAggPeriod: 0s
EOF

准备k8s所需的镜像

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操作节点[master1]

kubeadm config images pull --config kubeadm-config.yaml

image-20231202000515399

master1节点初始化

操作节点[master1]

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kubeadm init --config kubeadm-config.yaml --upload-certs --v=9

会生成信息

image-20231202000611013

记录信息后面会用到

初始化成功以后，会产生Token值，用于其他节点加入时使用，因此要记录下初始化成功生成的token值（令牌值），有效期24小时，后续需要操作可以重新生成Token

操作节点[master1]

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kubeadm join 192.168.48.200:16443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612 \
        --control-plane --certificate-key 37b1370abd3584c354517603bf97e10c795e3367e05e5ff3f2f6ca14288d8054


kubeadm join 192.168.48.200:16443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612

操作kubect报错：

image-20231110180035297

此时通过kubectl操作，会出现失败，因为还没有将集群的”钥匙”交给root用户。/etc/kubernetes/admin.conf 文件是 Kubernetes（K8s）集群中的管理员配置文件，它包含了用于管理集群的身份验证和访问信息。所以下面进行配置环境变量，用于访问Kubernetes集群：

添加环境变量

操作节点[master1]

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

添加其他master节点至集群中

操作节点[master2,master3]

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操作节点[master2,master3]
kubeadm join 192.168.48.200:16443 --token abcdef.0123456789abcdef \
        --discovery-token-ca-cert-hash sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612 \
        --control-plane --certificate-key 37b1370abd3584c354517603bf97e10c795e3367e05e5ff3f2f6ca14288d8054 \
        --cri-socket unix:///var/run/cri-dockerd.sock

注意：这里末尾添加了--cri-socket unix:///var/run/cri-dockerd.sock

接着给master2添加环境变量

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操作节点[master2,master3]
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

image-20231110180919008

这里没有展示master3的图片，但是步骤一样的

模拟Token过期重新生成并加入Node节点

假设加入集群的token过期了。node01无法加入了，这里就模拟一下这种情况

  1. Token过期后生成新的token：
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kubeadm token create --print-join-command
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[root@master1 ~]# kubeadm token create --print-join-command
kubeadm join 192.168.48.200:16443 --token ke773y.6hv9utk33to4vwfy --discovery-token-ca-cert-hash sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612
[root@master1 ~]#

其中，192.168.48.200:16443 是你的 Kubernetes API 服务器的地址和端口，ke773y.6hv9utk33to4vwfy 是新的令牌，sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612 是令牌的 CA 证书哈希值。

  1. Master需要生成–certificate-key：
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kubeadm init phase upload-certs --upload-certs
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[root@master1 ~]# kubeadm init phase upload-certs --upload-certs
W1110 18:12:03.426245   10185 version.go:104] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get "https://dl.k8s.io/release/stable-1.txt": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
W1110 18:12:03.426320   10185 version.go:105] falling back to the local client version: v1.28.2
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
5d3706028d5e569324a4c456c81ae0f5551ece88b3132f03917668c6b0605128

其中，5d3706028d5e569324a4c456c81ae0f5551ece88b3132f03917668c6b0605128 是证书密钥。

  1. 生成新的Token用于集群添加新Node节点

操作节点[node01]

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kubeadm join 192.168.48.200:16443 \
        --token ke773y.6hv9utk33to4vwfy \
        --discovery-token-ca-cert-hash sha256:bc27d821932d27bb4b49c187ddd412569ead01b14009e03b6d03aa3ea54e4612  \
        --cri-socket unix:///var/run/cri-dockerd.sock

注意：这里末尾添加了--cri-socket unix:///var/run/cri-dockerd.sock

image-20231110181623386

这时在master查看node状态（显示为notready不影响）

image-20231111145807000

模拟新加master节点的加入K8S集群中

假设我们新加master节点的话，就拼接token，从刚刚生成的token拼接

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[root@master1 ~]# kubeadm token create --print-join-command
kubeadm join 192.168.48.200:16443 --token tn5q1b.7w1jj77ewup7k2in --discovery-token-ca-cert-hash sha256:cc5427e0e133d95250ab0aa90976fea2c383278b6345fd7e8c28702ac8dfc61f

这里提取信息1

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kubeadm join 192.168.48.200:16443 --token tn5q1b.7w1jj77ewup7k2in --discovery-token-ca-cert-hash sha256:cc5427e0e133d95250ab0aa90976fea2c383278b6345fd7e8c28702ac8dfc61f

接着

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[root@master1 ~]# kubeadm init phase upload-certs --upload-certs
W1110 18:12:03.426245   10185 version.go:104] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get "https://dl.k8s.io/release/stable-1.txt": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
W1110 18:12:03.426320   10185 version.go:105] falling back to the local client version: v1.28.2
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
5d3706028d5e569324a4c456c81ae0f5551ece88b3132f03917668c6b0605128

这里提取信息2：这里前面要加上--control-plane --certificate-key

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--control-plane --certificate-key 5d3706028d5e569324a4c456c81ae0f5551ece88b3132f03917668c6b0605128

合成

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kubeadm join 192.168.48.200:16443 --token tn5q1b.7w1jj77ewup7k2in \
        --discovery-token-ca-cert-hash sha256:cc5427e0e133d95250ab0aa90976fea2c383278b6345fd7e8c28702ac8dfc61f  \
        --control-plane --certificate-key 5d3706028d5e569324a4c456c81ae0f5551ece88b3132f03917668c6b0605128 \
        --cri-socket unix:///var/run/cri-dockerd.sock
        
        
kubeadm join 192.168.48.200:16443 --token lnkno8.u4v1l8n9pahzf0kj \
        --discovery-token-ca-cert-hash sha256:cc5427e0e133d95250ab0aa90976fea2c383278b6345fd7e8c28702ac8dfc61f \
        --control-plane --certificate-key 41e441fe56cb4bdfcc2fc0291958e6b1da54d01f4649b6651471c07583f85cdf \
        --cri-socket unix:///var/run/cri-dockerd.sock


注意：这里末尾添加了--cri-socket unix:///var/run/cri-dockerd.sock

图示

image-20231110182741430

安装calico网络插件

操作节点[master1]

添加解析记录，否则无法访问

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echo '185.199.108.133 raw.githubusercontent.com' >> /etc/hosts

应用operator资源清单文件

网络组件有很多种，只需要部署其中一个即可，推荐Calico。
Calico是一个纯三层的数据中心网络方案，Calico支持广泛的平台，包括Kubernetes、OpenStack等。
Calico 在每一个计算节点利用 Linux Kernel 实现了一个高效的虚拟路由器（ vRouter） 来负责数据转发，而每个 vRouter 通过 BGP 协议负责把自己上运行的 workload 的路由信息向整个 Calico 网络内传播。
此外，Calico 项目还实现了 Kubernetes 网络策略，提供ACL功能。

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curl https://raw.githubusercontent.com/projectcalico/calico/v3.25.1/manifests/calico.yaml -O
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[root@master1 ~]# vim calico.yaml
。。。。。
- name: WAIT_FOR_DATASTORE
  value: "true"
  #添加以下两行
- name: IP_AUTODETECTION_METHOD
  value: interface=ens160
#ens160是你的网卡

image-20231110183944854

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sed -i 's| docker.io/calico/| registry.cn-hangzhou.aliyuncs.com/qianyios/|' calico.yaml
kubectl apply -f calico.yaml

image-20231110184031455

监视kube-system命名空间中pod运行情况

等待估计20分钟左右吧(确保全部running)

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kubectl get pods -n kube-system

image-20231110193921266

拿掉master节点的污点

节点 master1 和 master2 都有一个名为 node-role.kubernetes.io/control-plane:NoSchedule 的污点。这个污点的作用是阻止普通的 Pod 被调度到这些节点上，只允许特定的控制平面组件（如 kube-apiserver、kube-controller-manager 和 kube-scheduler）在这些节点上运行。

这种设置有助于确保控制平面节点专门用于运行 Kubernetes 的核心组件，而不会被普通的工作负载占用。通过将污点添加到节点上，可以确保只有被授权的控制平面组件才能在这些节点上运行。

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kubectl describe node master1 | grep -i taint
kubectl describe node master2 | grep -i taint
kubectl describe node master3 | grep -i taint

image-20231111152324023

去除污点

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kubectl taint node master1 node-role.kubernetes.io/control-plane:NoSchedule-
kubectl taint node master2 node-role.kubernetes.io/control-plane:NoSchedule-
kubectl taint node master3 node-role.kubernetes.io/control-plane:NoSchedule-

image-20231111152342956

安装dashboard

操作节点[master1]

下载文件

https://github.com/kubernetes/dashboard/releases/tag/v2.7.0

目前最新版本v2.7.0 

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wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml

image-20231014174400992

修改配置文件

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vim recommended.yaml
---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001
  type: NodePort
  selector:
    app: kubernetes-dashboard

---

image-20231014174511047

运行dashboard

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kubectl apply -f recommended.yaml

image-20231014174622344

检查运行状态

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kubectl get pods -n kubernetes-dashboard
kubectl get pod,svc -o wide -n kubernetes-dashboard

image-20231111025752605

创建cluster-admin用户

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创建service account并绑定默认cluster-admin管理员群角色
#创建用户
kubectl create serviceaccount dashboard-admin -n kubernetes-dashboard
#用户授权
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin
#获取用户Token
kubectl create token dashboard-admin -n kubernetes-dashboard

image-20231111025817854

记录token

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eyJhbGciOiJSUzI1NiIsImtpZCI6IjJxb21sRTZSckhEZ09FMnlvWU5IY3dfTTRIWDEzRUpsQ000MThhSWxYNDgifQ.eyJhdWQiOlsiaHR0cHM6Ly9rdWJlcm5ldGVzLmRlZmF1bHQuc3ZjLmNsdXN0ZXIubG9jYWwiXSwiZXhwIjoxNjk5NjQ2Mjg3LCJpYXQiOjE2OTk2NDI2ODcsImlzcyI6Imh0dHBzOi8va3ViZXJuZXRlcy5kZWZhdWx0LnN2Yy5jbHVzdGVyLmxvY2FsIiwia3ViZXJuZXRlcy5pbyI6eyJuYW1lc3BhY2UiOiJrdWJlcm5ldGVzLWRhc2hib2FyZCIsInNlcnZpY2VhY2NvdW50Ijp7Im5hbWUiOiJkYXNoYm9hcmQtYWRtaW4iLCJ1aWQiOiIyNTBhNTQ2MS03MGJlLTRhZTItOWY2Yi1hMDQwOWE1NWJhMTMifX0sIm5iZiI6MTY5OTY0MjY4Nywic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50Omt1YmVybmV0ZXMtZGFzaGJvYXJkOmRhc2hib2FyZC1hZG1pbiJ9.U-lH9_sRU4TVrpAznqS60INNSev9NxHu61igGUTzTBoaWo7WjPG7vzTnpZYhvsoglTzMEKhfranJkkkn95pe-prkvSasaAL6kXHw0jQjlSMzcYiF7DoLdkOtDJSukuALEubidf9eIwZXFZ-sezZdZHm4hnk5nWme5YtdOmYOJPh5sv1dzRvM1XuOHknJPTA1BbdZuVAtSGHSjkhwx-wl-41uuQoROW5GjJs0bz4zLBFn1w_pWaSMCn7pjGJNcbr6IuDV41km_etpwwxacWyfAcxNykzCtIiE1abJj7m-e944GvAn_eqxz3wCZD6Bgt41FWRzyMHjrppJfDjk7FaHNw

登录浏览器访问

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https://192.168.48.200:30001

输入token：
----
eyJhbGciOiJSUzI1NiIsImtpZCI6IjJxb21sRTZSckhEZ09FMnlvWU5IY3dfTTRIWDEzRUpsQ000MThhSWxYNDgifQ.eyJhdWQiOlsiaHR0cHM6Ly9rdWJlcm5ldGVzLmRlZmF1bHQuc3ZjLmNsdXN0ZXIubG9jYWwiXSwiZXhwIjoxNjk5NjQ2Mjg3LCJpYXQiOjE2OTk2NDI2ODcsImlzcyI6Imh0dHBzOi8va3ViZXJuZXRlcy5kZWZhdWx0LnN2Yy5jbHVzdGVyLmxvY2FsIiwia3ViZXJuZXRlcy5pbyI6eyJuYW1lc3BhY2UiOiJrdWJlcm5ldGVzLWRhc2hib2FyZCIsInNlcnZpY2VhY2NvdW50Ijp7Im5hbWUiOiJkYXNoYm9hcmQtYWRtaW4iLCJ1aWQiOiIyNTBhNTQ2MS03MGJlLTRhZTItOWY2Yi1hMDQwOWE1NWJhMTMifX0sIm5iZiI6MTY5OTY0MjY4Nywic3ViIjoic3lzdGVtOnNlcnZpY2VhY2NvdW50Omt1YmVybmV0ZXMtZGFzaGJvYXJkOmRhc2hib2FyZC1hZG1pbiJ9.U-lH9_sRU4TVrpAznqS60INNSev9NxHu61igGUTzTBoaWo7WjPG7vzTnpZYhvsoglTzMEKhfranJkkkn95pe-prkvSasaAL6kXHw0jQjlSMzcYiF7DoLdkOtDJSukuALEubidf9eIwZXFZ-sezZdZHm4hnk5nWme5YtdOmYOJPh5sv1dzRvM1XuOHknJPTA1BbdZuVAtSGHSjkhwx-wl-41uuQoROW5GjJs0bz4zLBFn1w_pWaSMCn7pjGJNcbr6IuDV41km_etpwwxacWyfAcxNykzCtIiE1abJj7m-e944GvAn_eqxz3wCZD6Bgt41FWRzyMHjrppJfDjk7FaHNw

----

image-20231111025910110

部署一个nginx测试

操作节点[master1]

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vim web.yaml

kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: web-deployment-label
  name: web-deployment
  namespace: default
spec:
  replicas: 3
  selector:
    matchLabels:
      app: web-selector
  template:
    metadata:
      labels:
        app: web-selector
    spec:
      containers:
      - name: web-container
        image: nginx:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        - containerPort: 443
          protocol: TCP
          name: https

---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: web-service-label
  name: web-service
  namespace: default
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30080
  - name: https
    port: 443
    protocol: TCP
    targetPort: 443
    nodePort: 30443
  selector:
    app: web-selector
    
kubectl apply -f web.yaml

image-20231014180923818

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### 查看nginx的pod 的详细信息
kubectl get deploy,svc,pod -o wide

image-20231016203536987

访问nginx网站

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http://192.168.48.200:30080

image-20231111030413487

特别声明
千屹博客旗下的所有文章，是通过本人课堂学习和课外自学所精心整理的知识巨著
难免会有出错的地方
如果细心的你发现了小失误，可以在下方评论区告诉我，或者私信我！
非常感谢大家的热烈支持！
#OpenEuler #K8s
OpenEuler-部署K8S高可用集群（外部etcd）
https://b.qianyios.top/2024/04/14/OpenEuler-部署K8S高可用集群（外部etcd）/
作者
严千屹
发布于
2024年4月14日
更新于
2024年4月18日
许可协议