Kubeadm安装高可用k8s 1.23.x

#!/bin/bash
if [ $# -eq 2 ];then
  echo "设置主机名为：$1"
  echo "eth0设置IP地址为：10.0.0.$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NetworkManager、firewalld、dnsmasq、selinux"
systemctl disable firewalld &> /dev/null
systemctl disable NetworkManager &> /dev/null
systemctl disable dnsmasq &> /dev/null
systemctl stop firewalld
systemctl stop NetworkManager
systemctl stop dnsmasq
sed -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/selinux/config
setenforce 0


echo "3.正在设置eth0：10.0.0.$2"
cat > /etc/sysconfig/network-scripts/ifcfg-eth0  /etc/yum.repos.d/Centos-Base.repo  /etc/yum.repos.d/epel.repo  /etc/yum.repos.d/kubernetes.repo  /dev/null
sed -i 's+https://download.docker.com+https://mirrors.tuna.tsinghua.edu.cn/docker-ce+' /etc/yum.repos.d/docker-ce.repo

echo "7.更新yum源软件包缓存"
yum makecache


echo "8.修改history格式及记录数"
sed -i "s#HISTSIZE=1000##g" /etc/profile
cat >> /etc/profile /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 "9.添加hosts解析"
cat >> /etc/hosts  /dev/null
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab


echo "11.安装ntpdate服务，并同步时间"
yum install ntpdate -y &> /dev/null
systemctl enabled ntpdate &> /dev/null
systemctl start ntpdate
echo "*/10 * * * * root /usr/sbin/ntpdate ntp1.aliyun.com >/dev/null 2>&1" > /etc/cron.d/ntp_sync


echo "12.配置limits.conf"
ulimit -SHn 65535
cat >> /etc/security/limits.conf  /dev/null


echo "14.升级系统并重启"
yum update -y --exclude=kernel* && reboot

#!/bin/bash
echo "1.下载安装包到/server/soft"
mkdir -p /server/soft ; cd /server/soft
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm


echo "2.正在安装kernel"
yum localinstall -y kernel-ml*


echo "3.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 "4.输出现在内核版本信息"
grubby --default-kernel


echo "5.安装ipvsadm"
yum install ipvsadm ipset sysstat conntrack libseccomp -y &> /dev/null


echo "6.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  /dev/null


echo "7.开启k8s集群必须的内核参数"
cat  /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 "8.配置完内核，重启服务器！"
reboot

yum install keepalived haproxy -y

# cat /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

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 k8s-master01   10.0.0.104:6443  check
  server k8s-master02   10.0.0.105:6443  check
  server k8s-master03   10.0.0.106:6443  check

[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf 
! 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 eth0
    mcast_src_ip 10.0.0.104
    virtual_router_id 51
    priority 101
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.236
    }
    track_script {
       chk_apiserver
    }
}

[root@k8s-master02 ~]# cat /etc/keepalived/keepalived.conf
! 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 eth0
    mcast_src_ip 10.0.0.105
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.236
    }
    track_script {
       chk_apiserver
    }
}

[root@k8s-master03 ~]# cat /etc/keepalived/keepalived.conf
! 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 eth0
    mcast_src_ip 10.0.0.106
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.236
    }
    track_script {
       chk_apiserver
    }
}

#cat /etc/keepalived/check_apiserver.sh

#!/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

chmod +x /etc/keepalived/check_apiserv服务器托管网er.sh

systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived

#ping 10.0.0.236 -c 2
PING 10.0.0.236 (10.0.0.236) 56(84) bytes of data.
64 bytes from 10.0.0.236: icmp_seq=1 ttl=64 time=0.067 ms
64 bytes from 10.0.0.236: icmp_seq=2 ttl=64 time=0.061 ms

[root@k8s-master01 ~]# telnet 10.0.0.236 16443
Trying 10.0.0.236...
Connected to 10.0.0.236.
Escape character is '^]'.
Connection closed by foreign host.

yum install docker-ce-20.10.* docker-ce-cli-20.10.* -y

mkdir /etc/docker
cat > /etc/docker/daemon.json 

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

yum list kubeadm.x86_64 --showduplicates | sort -r

yum install kubeadm-1.23* kubelet-1.23* kubectl-1.23* -y

systemctl daemon-reload
systemctl enable --now kubelet

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: 10.0.0.104
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: k8s-master01
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  certSANs:
  - 10.0.0.236
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: 10.0.0.236:16443
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
kind: ClusterConfiguration
kubernetesVersion: v1.23.17 # 更改此处的版本号和kubeadm version一致
networking:
  dnsDomain: cluster.local
  podSubnet: 172.16.0.0/16
  serviceSubnet: 192.168.0.0/16
scheduler: {}

kubeadm config migrate --old-config kubeadm-config.yaml --new-config new.yaml

scp /root/new.yaml root@10.0.0.105:/root
scp /root/new.yaml root@10.0.0.106:/root

kubeadm config images pull --config /root/new.yaml

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

cat > /root/.bashrc
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF
source /root/.bashrc

cat > /root/.bashrc
export KUBECONFIG=/etc/kubernetes/admin.conf
EOF
source /root/.bashrc

kubeadm token create --print-join-command

kubeadm init phase upload-certs --upload-certs

[root@k8s-master01 ~]# kubeadm token create --print-join-command
kubeadm join 10.0.0.236:16443 --token t3esfj.wvv6a5b7661cbkp1 --discovery-token-ca-cert-hash sha256:163ab3f59152d1684bd0cba8a5b7347b248bb07aca8d420058d0f1ce0480b9bc

[root@k8s-master01 ~]# kubeadm init phase upload-certs --upload-certs
I0716 23:29:53.752376   58857 version.go:256] remote version is much newer: v1.27.3; falling back to: stable-1.23
[upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
[upload-certs] Using certificate key:
49b6262e2eda9115c2f426374b72aac2590ebd86161e4c0fcf53f0e690eb59aa


#拼接如下：
kubeadm join 10.0.0.236:16443 --token t3esfj.wvv6a5b7661cbkp1 --discovery-token-ca-cert-hash sha256:163ab3f59152d1684bd0cba8a5b7347b248bb07aca8d420058d0f1ce0480b9bc --control-plane --certificate-key 49b6262e2eda9115c2f426374b72aac2590ebd86161e4c0fcf53f0e690eb59aa

cd /root/ ; git clone https://gitee.com/dukuan/k8s-ha-install.git

cd /root/k8s-ha-install && git checkout manual-installation-v1.23.x && cd calico/

POD_SUBNET=`cat /etc/kubernetes/manifests/kube-controller-manager.yaml | grep cluster-cidr= | awk -F= '{print $NF}'`
sed -i "s#POD_CIDR#${POD_SUBNET}#g" calico.yaml

kubectl apply -f calico.yaml

scp /etc/kubernetes/pki/front-proxy-ca.crt 10.0.0.107:/etc/kubernetes/pki/front-proxy-ca.crt
scp /etc/kubernetes/pki/front-proxy-ca.crt 10.0.0.108:/etc/kubernetes/pki/front-proxy-ca.crt

cd /root/k8s-ha-install/kubeadm-metrics-server
kubectl  create -f comp.yaml

cd /root/k8s-ha-install/dashboard/
kubectl  create -f .

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

#在master01节点执行
kubectl edit cm kube-proxy -n kube-system

#找到mode那一行修改成ipvs
mode: ipvs

kubectl patch daemonset kube-proxy -p "{"spec":{"template":{"metadata":{"annotations":{"date":"`date +'%s'`"}}}}}" -n kube-system

[root@k8s-master01 ~]# curl 127.0.0.1:10249/proxyMode
ipvs

kubectl get node

kubectl get pod -A

kubectl get svc
kubectl get pod -A -owide

kubectl create deploy cluster-test --image=registry.cn-beijing.aliyuncs.com/dotbalo/debug-tools -- sleep 3600

#取上面的NAME进入pod
kubectl exec -it cluster-test-8b47d69f5-dbvvf -- bash

#解析两个域名，能够对应到.1和.10即可
nslookup kubernetes
nslookup kube-dns.kube-system

curl https://192.168.0.1:443
curl 192.168.0.10:53

#刚刚创建的一个测试Pod，看看IP也放在哪个节点上
[root@k8s-master01 ~]# kubectl get pod -owide
NAME                           READY   STATUS    RESTARTS   AGE     IP              NODE         NOMINATED NODE   READINESS GATES
cluster-test-8b47d69f5-dbvvf   1/1     Running   0          6m34s   172.16.58.194   k8s-node02              


#找出不在node02上的Pod IP，然后两个Pod之间不在同一机器上进ping
kubectl get pod -n kube-system -owide

#找刚从创建的测试Pod IP，全主机进行ping测试，都ping通即可。
[root@k8s-master01 ~]# kubectl get pod -owide
NAME                           READY   STATUS    RESTARTS   AGE     IP              NODE         NOMINATED NODE   READINESS GATES
cluster-test-8b47d69f5-dbvvf   1/1     Running   0          9m23s   172.16.58.194   k8s-node02