rpm安装jenkins后启动报错Starting Jenkins bash: /usr/local/java: 是一个目录

报错如下：

[root@localhost /]# 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 一 2022-02-21 15:27:10 CST; 7s ago
Docs: man:systemd-sysv-generator(8)
Process: 14141 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)

2月 21 15:27:10 localhost.localdomain systemd[1]: Starting LSB: Jenkins Automation Server…
2月 21 15:27:10 localhost.localdomain runuser[14146]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
2月 21 15:27:10 localhost.localdomain jenkins[14141]: Starting Jenkins bash: /usr/bin/java: 是一个目录
2月 21 15:27:10 localhost.localdomain jenkins[14141]: [失败]
2月 21 15:27:10 localhost.localdomain systemd[1]: jenkins.service: control process exited, code=exited status=1
2月 21 15:27:10 localhost.localdomain systemd[1]: Failed to start LSB: Jenkins Automation Server.
2月 21 15:27:10 localhost.localdomain systemd[1]: Unit jenkins.service entered failed state.
2月 21 15:27:10 localhost.localdomain systemd[1]: jenkins.service failed.
[root@localhost /]# vim /etc/rc.d/init.d/jenkins

这一看报错，明显java环境出了问题，找不到java了

检查java环境：

[root@localhost /]# systemctl daemon-reload
[root@localhost /]# systemctl restart jenkins
[root@localhost /]# systemctl status jenkins
● jenkins.service - LSB: Jenkins Automation Server
Loaded: loaded (/etc/rc.d/init.d/jenkins; bad; vendor preset: disabled)
Active: active (running) since 一 2022-02-21 15:30:38 CST; 6s ago
Docs: man:systemd-sysv-generator(8)
Process: 15485 ExecStop=/etc/rc.d/init.d/jenkins stop (code=exited, status=0/SUCCESS)
Process: 15507 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/jenkins.service
└─15528 /usr/local/jdk1.8.0_251/bin/java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -j…

2月 21 15:30:37 localhost.localdomain systemd[1]: Stopped LSB: Jenkins Automation Server.
2月 21 15:30:37 localhost.localdomain systemd[1]: Starting LSB: Jenkins Automation Server…
2月 21 15:30:37 localhost.localdomain runuser[15512]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
2月 21 15:30:38 localhost.localdomain systemd[1]: Started LSB: Jenkins Automation Server.
2月 21 15:30:38 localhost.localdomain jenkins[15507]: Starting Jenkins [ 确定 ]

最后一行添加自己安装的java路径（注：一定要写道jbin/java），保存退出

再次启动jenkins

systemctl restart jenkins

systemctl status jenkins

启动成功！

附上jenkins的各文件路径：

/usr/lib/jenkins/jenkins.war WAR包

/etc/sysconfig/jenkins 配置文件

/var/lib/jenkins/ 默认的家目录

/var/log/jenkins/jenkins.log 日志文件