systemcel restart jenkins 重启失败

Question

执行如下命令

[root@localhost jenkins]# systemctl restart jenkins  
Job for jenkins.service failed because the control process exited with error code. See "systemctl status jenkins.service" and "journalctl -xe" for details.

根据提示查看错误细节

[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 三 2021-12-15 14:33:01 CST; 13s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 19471 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=1/FAILURE)
    Tasks: 37
   Memory: 427.2M
   CGroup: /system.slice/jenkins.service
           ├─950 runuser -s /bin/bash root -c ulimit -S -c 0 >/dev/null 2>&1 ; /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJ...
           ├─967 bash -c ulimit -S -c 0 >/dev/null 2>&1 ; /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJENKINS_HOME=/var/lib/...
           └─968 /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war...

12月 15 14:32:57 localhost.localdomain systemd[1]: Starting LSB: Jenkins Automation Server...
12月 15 14:32:57 localhost.localdomain runuser[19476]: pam_unix(runuser:session): session opened for user root by (uid=0)
12月 15 14:33:01 localhost.localdomain systemd[1]: jenkins.service: control process exited, code=exited status=1
12月 15 14:33:01 localhost.localdomain jenkins[19471]: Starting Jenkins [失败]
12月 15 14:33:01 localhost.localdomain systemd[1]: **Failed to start LSB: Jenkins Automation Server.**
12月 15 14:33:01 localhost.localdomain systemd[1]: Unit jenkins.service entered failed state.
12月 15 14:33:01 localhost.localdomain systemd[1]: jenkins.service failed.

systemctl status jenkins.service 和 journalctl -xe 命令均提示如上加粗内容

（1）上网搜索了，看到有提示java目录没找到的，但我的是对的

[root@localhost ~]# which java
/usr/bin/java
[root@localhost ~]# cat /etc/init.d/jenkins 
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/bin/java    # 两者一致
"

（2）说java版本低了，用的是jdk1.7，应该将上面的注释掉
（3）搜了很久了，还是重启不了jenkins
但是，我可以在浏览器地址栏输入 虚拟机ip:jenkins的端口，成功访问了，很迷
而且我还更新了插件，选择了了完成后重启，还重启了，但命令行就不行
新学jenkins，后来新建任务也执行失败，无从下手了
初次启动jenkins的时候，推荐安装的插件 一些成功，一些失败，后来重试全部失败了
就这样我进到jenkins首页，还新建了第一个管理员用户，都不知道发生了啥，直到后来jenkins执行maven项目失败

请知道的小伙伴 帮我一把

Answer 1

查看jenkins进程，如下：

[root@localhost ~]# ps -ef | grep jenkins
root        950      1  0 09:01 ?        00:00:00 runuser -s /bin/bash root -c ulimit -S -c 0 >/dev/null 2>&1 ; /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war --daemon --httpPort=8888 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20
root        967    950  0 09:01 ?        00:00:00 bash -c ulimit -S -c 0 >/dev/null 2>&1 ; /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war --daemon --httpPort=8888 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20
root        968    967  0 09:01 ?        00:05:27 /etc/alternatives/java -Djava.awt.headless=true -Dhudson.model.DownloadService.noSignatureCheck=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins/war --daemon --httpPort=8888 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20
root      44434  44405  0 22:55 pts/0    00:00:00 grep --color=auto jenkins
[root@localhost ~]#