k8s实战案例之运行Java单体服务-jenkins

1、jenkins架构

基于java命令，运⾏java war包或jar包，本次以jenkins.war 包部署⽅式为例，且要求jenkins的数据保存⾄外部存储(NFS或者PVC)，其他java应⽤看实际需求是否需要将数据保存⾄外部存储。

从上述架构图可以看到，Jenkins通过k8s上的pv/pvc来连接外部存储，通过svc的方式向外暴露服务，在集群内部通过直接访问svc就可以正常访问到jenkins，对于集群外部成员，通过外部负载均衡器来访问Jenkins；

2、镜像准备

2.1、Jenkins镜像目录文件

root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# tree
.
├── Dockerfile
├── build-command.sh
├── jenkins-2.319.2.war
└── run_jenkins.sh

0 directories, 4 files
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# 

2.2、构建Jenkins镜像

2.2.1、构建Jenkins镜像Dockerfile

root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# cat Dockerfile
#Jenkins Version 2.190.1
FROM harbor.ik8s.cc/pub-images/jdk-base:v8.212

ADD jenkins-2.319.2.war /apps/jenkins/jenkins.war
ADD run_jenkins.sh /usr/bin/

EXPOSE 8080 

CMD ["/usr/bin/run_jenkins.sh"]
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# 

上述Dockerfile主要引用了一个jdk-base的镜像，该镜像有java环境，然后再这基础之上将jenkins war包和运行脚本加进去，然后暴露8080端口，最后给出运行jenkins的cmd命令；

2.2.2、运行jenkins 脚本

root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# cat run_jenkins.sh 
#!/bin/bash
cd /apps/jenkins && java -server -Xms1024m -Xmx1024m -Xss512k -jar jenkins.war --webroot=/apps/jenkins/jenkins-data --httpPort=8080
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# 

2.2.3、构建Jenkins镜像脚本

root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# cat build-command.sh 
#!/bin/bash
#docker build -t  harbor.ik8s.cc/magedu/jenkins:v2.319.2 .
#echo "镜像制作完成，即将上传至Harbor服务器"
#sleep 1
#docker push harbor.ik8s.cc/magedu/jenkins:v2.319.2
#echo "镜像上传完成"

echo "即将开始就像构建,请稍等!" && echo 3 && sleep 1 && echo 2 && sleep 1 && echo 1
nerdctl build -t  harbor.ik8s.cc/magedu/jenkins:v2.319.2 .
if [ $? -eq 0 ];then
  echo "即将开始镜像上传,请稍等!" && echo 3 && sleep 1 && echo 2 && sleep 1 && echo 1
  nerdctl push harbor.ik8s.cc/magedu/jenkins:v2.319.2 
  if [ $? -eq 0 ];then
    echo "镜像上传成功!"
  else
    echo "镜像上传失败"
  fi
else
  echo "镜像构建失败,请检查构建输出信息!"
fi
root@k8s-master01:~/k8s-data/dockerfile/web/magedu/jenkins# 

运行脚本构建镜像

2.3、验证Jenkins镜像

2.3.1、在harbor上查看对应jenkins镜像是否正常上传？

2.3.2、测试Jenkins镜像是否可以正常运行？

2.3.3、web访问jenkins是否可以正常访问？

能够看到上述页面，说明jenkins镜像制作没有问题;

3、准备PV/PVC

3.1、在nfs服务器上准备jenkins数据目录

root@harbor:~# mkdir -p /data/k8sdata/magedu/{jenkins-data,jenkins-root-data}
root@harbor:~# ll /data/k8sdata/magedu/{jenkins-data,jenkins-root-data}
/data/k8sdata/magedu/jenkins-data:
total 8
drwxr-xr-x  2 root root 4096 Aug  6 03:35 ./
drwxr-xr-x 21 root root 4096 Aug  6 03:35 ../

/data/k8sdata/magedu/jenkins-root-data:
total 8
drwxr-xr-x  2 root root 4096 Aug  6 03:35 ./
drwxr-xr-x 21 root root 4096 Aug  6 03:35 ../
root@harbor:~# tail  /etc/exports

/data/k8sdata/magedu/mysql-datadir-1 *(rw,no_root_squash)
/data/k8sdata/magedu/mysql-datadir-2 *(rw,no_root_squash)
/data/k8sdata/magedu/mysql-datadir-3 *(rw,no_root_squash)
/data/k8sdata/magedu/mysql-datadir-4 *(rw,no_root_squash)
/data/k8sdata/magedu/mysql-datadir-5 *(rw,no_root_squash)


/data/k8sdata/magedu/jenkins-data *(rw,no_root_squash)
/data/k8sdata/magedu/jenkins-root-data *(rw,no_root_squash)
root@harbor:~# exportfs -av
exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/kuboard".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [2]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/volumes".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [3]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/pod-vol".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [4]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/myserver".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [5]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/mysite".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [7]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/images".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [8]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/static".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [11]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-1".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [12]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-2".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [13]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/zookeeper-datadir-3".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [16]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis-datadir-1".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [18]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis0".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [19]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis1".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [20]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis2".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [21]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis3".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [22]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis4".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [23]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/redis5".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [27]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/mysql-datadir-1".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [28]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/mysql-datadir-2".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [29]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/mysql-datadir-3".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [30]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/mysql-datadir-4".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [31]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/mysql-datadir-5".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [34]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/jenkins-data".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exportfs: /etc/exports [35]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/data/k8sdata/magedu/jenkins-root-data".
  Assuming default behaviour ('no_subtree_check').
  NOTE: this default has changed since nfs-utils version 1.0.x

exporting *:/data/k8sdata/magedu/jenkins-root-data
exporting *:/data/k8sdata/magedu/jenkins-data
exporting *:/data/k8sdata/magedu/mysql-datadir-5
exporting *:/data/k8sdata/magedu/mysql-datadir-4
exporting *:/data/k8sdata/magedu/mysql-datadir-3
exporting *:/data/k8sdata/magedu/mysql-datadir-2
exporting *:/data/k8sdata/magedu/mysql-datadir-1
exporting *:/data/k8sdata/magedu/redis5
exporting *:/data/k8sdata/magedu/redis4
exporting *:/data/k8sdata/magedu/redis3
exporting *:/data/k8sdata/magedu/redis2
exporting *:/data/k8sdata/magedu/redis1
exporting *:/data/k8sdata/magedu/redis0
exporting *:/data/k8sdata/magedu/redis-datadir-1
exporting *:/data/k8sdata/magedu/zookeeper-datadir-3
exporting *:/data/k8sdata/magedu/zookeeper-datadir-2
exporting *:/data/k8sdata/magedu/zookeeper-datadir-1
exporting *:/data/k8sdata/magedu/static
exporting *:/data/k8sdata/magedu/images
exporting *:/data/k8sdata/mysite
exporting *:/data/k8sdata/myserver
exporting *:/pod-vol
exporting *:/data/volumes
exporting *:/data/k8sdata/kuboard
root@harbor:~# 

3.2、在k8s上创建pv

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: jenkins-datadir-pv
  namespace: magedu
spec:
  capacity:
    storage: 100Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.0.42
    path: /data/k8sdata/magedu/jenkins-data 

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: jenkins-root-datadir-pv
  namespace: magedu
spec:
  capacity:
    storage: 100Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 192.168.0.42
    path: /data/k8sdata/magedu/jenkins-root-data

root@k8s-master01:~/k8s-data/yaml/magedu/jenkins/pv# kubectl apply  -f jenkins-persistentvolume.yaml 
persistentvolume/jenkins-datadir-pv created
persistentvolume/jenkins-root-datadir-pv created
root@k8s-master01:~/k8s-data/yaml/magedu/jenkins/pv# 

3.3、验证pv

3.4、在k8s上创建pvc

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: jenkins-datadir-pvc
  namespace: magedu
spec:
  volumeName: jenkins-datadir-pv
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 80Gi

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: jenkins-root-data-pvc
  namespace: magedu
spec:
  volumeName: jenkins-root-datadir-pv 
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 80Gi

root@k8s-master01:~/k8s-data/yaml/magedu/jenkins/pv# kubectl apply -f jenkins-persistentvolumeclaim.yaml
persistentvolumeclaim/jenkins-datadir-pvc created
persistentvolumeclaim/jenkins-root-data-pvc created
root@k8s-master01:~/k8s-data/yaml/magedu/jenkins/pv# 

3.5、验证pvc

4、准备在k8s上运行jenkins的yaml文件

kind: Deployment
#apiVersion: extensions/v1beta1
apiVersion: apps/v1
metadata:
  labels:
    app: magedu-jenkins
  name: magedu-jenkins-deployment
  namespace: magedu
spec:
  replicas: 1
  selector:
    matchLabels:
      app: magedu-jenkins
  template:
    metadata:
      labels:
        app: magedu-jenkins
    spec:
      containers:
      - name: magedu-jenkins-container
        image: harbor.ik8s.cc/magedu/jenkins:v2.319.2 
        #imagePullPolicy: IfNotPresent
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
        volumeMounts:
        - mountPath: "/apps/jenkins/jenkins-data/"
          name: jenkins-datadir-magedu
        - mountPath: "/root/.jenkins"
          name: jenkins-root-datadir
      volumes:
        - name: jenkins-datadir-magedu
          persistentVolumeClaim:
            claimName: jenkins-datadir-pvc
        - name: jenkins-root-datadir
          persistentVolumeClaim:
            claimName: jenkins-root-data-pvc

---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: magedu-jenkins
  name: magedu-jenkins-service
  namespace: magedu
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
    nodePort: 38080
  selector:
    app: magedu-jenkins

5、应用配置清单运行Jenkins

root@k8s-master01:~/k8s-data/yaml/magedu/jenkins# kubectl apply -f jenkins.yaml
deployment.apps/magedu-jenkins-deployment created
service/magedu-jenkins-service created
root@k8s-master01:~/k8s-data/yaml/magedu/jenkins# 

6、验证

6.1、验证Jenkins Pod是否正常运行？

6.2、验证web访问jenkins是否可正常访问？

查看jenkins密码

root@k8s-master01:~/k8s-data/yaml/magedu/jenkins# kubectl get pods -n magedu 
NAME                                             READY   STATUS      RESTARTS        AGE
magedu-jenkins-deployment-5f6899db-zn4xg         1/1     Running     0               11m
magedu-nginx-deployment-5589bbf4bc-6gd2w         1/1     Running     12 (107m ago)   62d
magedu-tomcat-app1-deployment-7754c8549c-c7rtb   1/1     Running     6 (108m ago)    62d
magedu-tomcat-app1-deployment-7754c8549c-prglk   1/1     Running     6 (108m ago)    62d
mysql-0                                          2/2     Running     4 (108m ago)    51d
mysql-1                                          2/2     Running     4 (108m ago)    51d
mysql-2                                          2/2     Running     4 (108m ago)    51d
redis-0                                          1/1     Running     4 (108m ago)    60d
redis-1                                          1/1     Running     4 (108m ago)    60d
redis-2                                          1/1     Running     4 (108m ago)    60d
redis-3                                          1/1     Running     4 (108m ago)    60d
redis-4                                          1/1     Running     4 (108m ago)    60d
redis-5                                          1/1     Running     4 (108m ago)    60d
ubuntu1804                                       0/1     Completed   0               60d
zookeeper1-675c5477cb-vmwwq                      1/1     Running     6 (108m ago)    62d
zookeeper2-759fb6c6f-7jktr                       1/1     Running     6 (108m ago)    62d
zookeeper3-5c78bb5974-vxpbh                      1/1     Running     6 (108m ago)    62d
root@k8s-master01:~/k8s-data/yaml/magedu/jenkins# kubectl exec -it magedu-jenkins-deployment-5f6899db-zn4xg -n magedu  cat /root/.jenkins/secrets/initialAdminPassword
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
8c4a17a8ecfe4fb88ed8701cb18340df
root@k8s-master01:~/k8s-data/yaml/magedu/jenkins# 

ok，能够通过web网页正常访问到jenkins pod，到此jenkins服务就正常运行至k8s上了；后续可以通过外部负载均衡器将jenkins发布到集群外部成员访问；

7、在外部负载均衡器上发布jenkins

ha01

root@k8s-ha01:~# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
  
global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
  
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    garp_master_delay 10
    smtp_alert
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.111 dev ens160 label ens160:0
        192.168.0.112 dev ens160 label ens160:1
    }
}
root@k8s-ha01:~# cat /etc/haproxy/haproxy.cfg 
global
        log /dev/log    local0
        log /dev/log    local1 notice
        chroot /var/lib/haproxy
        stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
        stats timeout 30s
        user haproxy
        group haproxy
        daemon

        # Default SSL material locations
        ca-base /etc/ssl/certs
        crt-base /etc/ssl/private

        # See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
        ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
        ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
        ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
        errorfile 400 /etc/haproxy/errors/400.http
        errorfile 403 /etc/haproxy/errors/403.http
        errorfile 408 /etc/haproxy/errors/408.http
        errorfile 500 /etc/haproxy/errors/500.http
        errorfile 502 /etc/haproxy/errors/502.http
        errorfile 503 /etc/haproxy/errors/503.http
        errorfile 504 /etc/haproxy/errors/504.http

listen k8s_apiserver_6443
bind 192.168.0.111:6443
mode tcp
#balance leastconn
server k8s-master01 192.168.0.31:6443 check inter 2000 fall 3 rise 5
server k8s-master02 192.168.0.32:6443 check inter 2000 fall 3 rise 5
server k8s-master03 192.168.0.33:6443 check inter 2000 fall 3 rise 5

listen jenkins_80
bind 192.168.0.112:80
mode tcp
server k8s-node01 192.168.0.34:38080 check inter 2000 fall 3 rise 5
server k8s-node02 192.168.0.35:38080 check inter 2000 fall 3 rise 5
server k8s-node03 192.168.0.36:38080 check inter 2000 fall 3 rise 5
root@k8s-ha01:~# systemctl restart keepalived haproxy
root@k8s-ha01:~# ss -tnl
State            Recv-Q            Send-Q                       Local Address:Port                       Peer Address:Port           Process           
LISTEN           0                 4096                         192.168.0.111:6443                            0.0.0.0:*                                
LISTEN           0                 4096                         192.168.0.112:80                              0.0.0.0:*                                
LISTEN           0                 4096                         127.0.0.53%lo:53                              0.0.0.0:*                                
LISTEN           0                 128                                0.0.0.0:22                              0.0.0.0:*                                
root@k8s-ha01:~# 

ha02

root@k8s-ha02:~# cat /etc/keepalived/keepalived.conf 
! Configuration File for keepalived
  
global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
  
vrrp_instance VI_1 {
    state BACKUP
    interface ens160
    garp_master_delay 10
    smtp_alert
    virtual_router_id 51
    priority 70
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.111 dev ens160 label ens160:0
        192.168.0.112 dev ens160 label ens160:1
    }
}
root@k8s-ha02:~# cat /etc/haproxy/haproxy.cfg 
global
        log /dev/log    local0
        log /dev/log    local1 notice
        chroot /var/lib/haproxy
        stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
        stats timeout 30s
        user haproxy
        group haproxy
        daemon

        # Default SSL material locations
        ca-base /etc/ssl/certs
        crt-base /etc/ssl/private

        # See: https://ssl-config.mozilla.org/#server=haproxy&server-version=2.0.3&config=intermediate
        ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
        ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
        ssl-default-bind-options ssl-min-ver TLSv1.2 no-tls-tickets

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
        errorfile 400 /etc/haproxy/errors/400.http
        errorfile 403 /etc/haproxy/errors/403.http
        errorfile 408 /etc/haproxy/errors/408.http
        errorfile 500 /etc/haproxy/errors/500.http
        errorfile 502 /etc/haproxy/errors/502.http
        errorfile 503 /etc/haproxy/errors/503.http
        errorfile 504 /etc/haproxy/errors/504.http

listen k8s_apiserver_6443
bind 192.168.0.111:6443
mode tcp
#balance leastconn
server k8s-master01 192.168.0.31:6443 check inter 2000 fall 3 rise 5
server k8s-master02 192.168.0.32:6443 check inter 2000 fall 3 rise 5
server k8s-master03 192.168.0.33:6443 check inter 2000 fall 3 rise 5


listen jenkins_80
bind 192.168.0.112:80
mode tcp 
server k8s-node01 192.168.0.34:38080 check inter 2000 fall 3 rise 5
server k8s-node02 192.168.0.35:38080 check inter 2000 fall 3 rise 5
server k8s-node03 192.168.0.36:38080 check inter 2000 fall 3 rise 5
root@k8s-ha02:~# systemctl restart keepalived haproxy 
root@k8s-ha02:~# 
root@k8s-ha02:~# ss -tnl
State            Recv-Q            Send-Q                       Local Address:Port                       Peer Address:Port           Process           
LISTEN           0                 4096                         192.168.0.111:6443                            0.0.0.0:*                                
LISTEN           0                 4096                         192.168.0.112:80                              0.0.0.0:*                                
LISTEN           0                 4096                         127.0.0.53%lo:53                              0.0.0.0:*                                
LISTEN           0                 128                                0.0.0.0:22                              0.0.0.0:*                                
root@k8s-ha02:~# 

7.1、访问负载均衡器的vip，看看是否能够访问到jenkins ?

能够正常通过访问负载均衡器的vip访问到jenkins，说明jenkins服务正常被负载均衡器反代成功；文章来源地址https://www.toymoban.com/news/detail-628117.html

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