1.安装Jenkins：
下载：wget https://pkg.jenkins.io/redhat-stable/jenkins-2.249.3-1.1.noarch.rpm
安装：rpm -ivh jenkins-2.249.3-1.1.noarch.rpm
2.修改端口号(默认8080)
vim /etc/sysconfig/jenkins-->JENKINS_PORT="8011"
3.启动/重启/停止/查看状态
systemctl start jenkins
systemctl restart jenkins
systemctl stop jenkins
systemctl status jenkins
4.问题解决
在启动jenkins时，有可能出现报错：Job for jenkins.service failed because the control process exited with error code. See "systemctl status jenkins.service" and "journalctl -xe" for details.
====解决方法：1）echo $JAVA_HOME(java环境变量)；2）vim /etc/init.d/jenkins，在candidates中添加java环境变量；3）systemctl daemon-reload；4）systemctl restart jenkins
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