参考：https://blog.csdn.net/hello_world_qwp/article/details/82705626
下载网址：https://jenkins.io/zh/download/
下载rpm包
运行rpm安装命令
rpm -ivh ./jenkins-2.204.2-1.1.noarch.rpm启动服务报错，查看状态
[root]# systemctl status jenkins.service
● jenkins.service - LSB: Jenkins Automation Server
Loaded: loaded (/etc/rc.d/init.d/jenkins; bad; vendor preset: disabled)
Active: failed (Result: exit-code) since Fri 2020-02-21 15:24:15 CST; 14s ago
Docs: man:systemd-sysv-generator(8)
Process: 20173 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)
Feb 21 15:24:15 cdhnode1.dongriaf.com systemd[1]: Starting LSB: Jenkins Automation Server...
Feb 21 15:24:15 cdhnode1.dongriaf.com runuser[20178]: pam_unix(runuser:session): session o...0)
Feb 21 15:24:15 cdhnode1.dongriaf.com jenkins[20173]: Starting Jenkins bash: /usr/bin/java...ry
Feb 21 15:24:15 cdhnode1.dongriaf.com runuser[20178]: pam_unix(runuser:session): session c...ns
Feb 21 15:24:15 cdhnode1.dongriaf.com jenkins[20173]: [FAILED]
Feb 21 15:24:15 cdhnode1.dongriaf.com systemd[1]: jenkins.service: control process exited,...=1
Feb 21 15:24:15 cdhnode1.dongriaf.com systemd[1]: Failed to start LSB: Jenkins Automation ...r.
Feb 21 15:24:15 cdhnode1.dongriaf.com systemd[1]: Unit jenkins.service entered failed state.
Feb 21 15:24:15 cdhnode1.dongriaf.com systemd[1]: jenkins.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
Failed to start LSB: Jenkins Automation Server
刚开始怀疑是jenkins的8080端口被占用
修改jenkins的配置文件：
vim /etc/sysconfig/jenkins端口改成其他
JENKINS_PORT="9090"结果还是不行
后面网上找资料是 Jenkins 未加载到 java 环境的问题，直接到修改 Jenkins 的启动文件
vim /etc/init.d/jenkins编辑再candidates加上jdk的路径
/usr/local/jdk1.8.0_231/bin/java
/usr/local/jdk1.8.0_231/jre/bin/java
candidates="
/etc/alternatives/java
/usr/lib/jvm/java-1.8.0/bin/java
/usr/lib/jvm/jre-1.8.0/bin/java
/usr/lib/jvm/java-1.7.0/bin/java
/usr/lib/jvm/jre-1.7.0/bin/java
/usr/lib/jvm/java-11.0/bin/java
/usr/lib/jvm/jre-11.0/bin/java
/usr/lib/jvm/java-11-openjdk-amd64
/usr/bin/java
/usr/local/jdk1.8.0_231/bin/java
/usr/local/jdk1.8.0_231/jre/bin/java
"再次尝试启动成功
systemctl start jenkins