1、安装JDK
yum install -y java

2、安装jenkins
添加Jenkins库到yum库，Jenkins将从这里下载安装。

wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo
rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
yum install -y jenkins
或
yum install jenkins -y --nogpgcheck

修改jenkins端口
[root@tools ~]# rpm -qa | grep jenkins
jenkins-2.340-1.1.noarch

[root@tools ~]# rpm -ql jenkins-2.340-1.1.noarch
/etc/init.d/jenkins
/etc/logrotate.d/jenkins
/etc/sysconfig/jenkins
/usr/bin/jenkins
/usr/lib/systemd/system/jenkins.service
/usr/sbin/rcjenkins
/usr/share/java/jenkins.war
/usr/share/jenkins
/usr/share/jenkins/migrate
/var/cache/jenkins
/var/lib/jenkins
/var/log/jenkins
[root@tools ~]# vim /usr/lib/systemd/system/jenkins.service

vi /etc/sysconfig/jenkins
找到修改端口号：

JENKINS_PORT=“9000” #此端口不冲突可以不修改

3.启动jenkins
systemctl start jenkins.service
[root@tools ~]# netstat -nultp

安装成功后Jenkins将作为一个守护进程随系统启动
系统会创建一个“jenkins”用户来允许这个服务，如果改变服务所有者，同时需要修改/var/log/jenkins, /var/lib/jenkins, 和/var/cache/jenkins的所有者
启动的时候将从/etc/sysconfig/jenkins获取配置参数
默认情况下，Jenkins运行在8080端口，在浏览器中直接访问该端进行服务配置
Jenkins的RPM仓库配置被加到/etc/yum.repos.d/jenkins.repo
4.打开jenkins
在浏览器中访问
http://192.168.3.200:9000/
首次进入会要求输入初始密码如下图，
初始密码在：/var/lib/jenkins/secrets/initialAdminPassword

重置密码：
admin
admin