jenkins 下载地址

https://pkg.jenkins.io/redhat/

开始安装 Jenkins

rpm -ivh jenkins-2.187-1.1.noarch.rpm

配置 jenkis的端口

vim /etc/sysconfig/jenkins

JENKINS_PORT="8080"  #此端口不冲突可以不修改 

JENKINS_USER="root" # jenkins 用户权限不够

启动jenkins

service jenkins start/stop/restart

或者：sudo service jenkins status 查看状态

• 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

安装问题

[root@localhost jenkins]# 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 日 2019-08-11 13:01:43 CST; 20s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 85644 ExecStop=/etc/rc.d/init.d/jenkins stop (code=exited, status=0/SUCCESS)
  Process: 89938 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)

8月 11 13:01:43 localhost.localdomain runuser[89947]: pam_unix(runuser:session): session opened for user root by (uid=0)
8月 11 13:01:43 localhost.localdomain systemd[1]: Starting LSB: Jenkins Automation Server...
8月 11 13:01:43 localhost.localdomain jenkins[89938]: Starting Jenkins bash: /usr/bin/java: 没有那个文件或目录
8月 11 13:01:43 localhost.localdomain jenkins[89938]: [失败]
8月 11 13:01:43 localhost.localdomain systemd[1]: jenkins.service: control process exited, code=exited status=1
8月 11 13:01:43 localhost.localdomain systemd[1]: Failed to start LSB: Jenkins Automation Server.
8月 11 13:01:43 localhost.localdomain systemd[1]: Unit jenkins.service entered failed state.
8月 11 13:01:43 localhost.localdomain systemd[1]: jenkins.service failed.

解决办法

vim /etc/init.d/jenkins

candidates="
/usr/java/jdk1.8.0_221/bin/java # 此处是自己的jdk路径
/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
"

vim /etc/sysconfig/jenkins

JENKINS_JAVA_CMD="$candidate"  

重新启动

[root@localhost jenkins]# systemctl daemon-reload
[root@localhost jenkins]# service jenkins start
完美解决

建议在登录Jenkins之前把插件可能存在的问题配置好

登入 Jenkins

http://192.168.121.3:8080

如果忘记密码，找回方式

vi /var/lib/jenkins/secrets/initialAdminPassword

安装插件问题

checknow 报红色预警

vim /var/lib/jenkins/updates/default.json
该配置文件中http://www.google.com，查找更换为http://www.baidu.com

项目中插件下载地址默认配置Https的地址
（https://updates.jenkins.io/update-center.json），
修改为http即可,有可以能还是不行就修改成下面的国内镜像。再重启服务。国内的镜像地址

修改配置 hudson.model.UpdateCenter.xml

vim /var/lib/jenkins/hudson.model.UpdateCenter.xml
https://mirrors.tuna.tsinghua.edu.cn/jenkins/updates/update-center.json
http://mirror.esuni.jp/jenkins/updates/update-center.json