jenkins升级后启动失败，查看状态！

[root@xxx ]$systemctl status jenkins
● jenkins.service - Jenkins Continuous Integration Server
     Loaded: loaded (/lib/systemd/system/jenkins.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Fri 2023-06-16 09:47:33 CST; 28s ago
    Process: 2563015 ExecStart=/usr/bin/jenkins (code=exited, status=1/FAILURE)
   Main PID: 2563015 (code=exited, status=1/FAILURE)

Jun 16 09:47:33 lzysg-ops-01 systemd[1]: jenkins.service: Scheduled restart job, restart counter is at 5.
Jun 16 09:47:33 lzysg-ops-01 systemd[1]: Stopped Jenkins Continuous Integration Server.
Jun 16 09:47:33 lzysg-ops-01 systemd[1]: jenkins.service: Start request repeated too quickly.
Jun 16 09:47:33 lzysg-ops-01 systemd[1]: jenkins.service: Failed with result 'exit-code'.
Jun 16 09:47:33 lzysg-ops-01 systemd[1]: Failed to start Jenkins Continuous Integration Server.

这里也无法看清楚具体的报错信息，然后查看messages日志发现如下问题启动时java1.8

因为我jenkins是apt安装的所以配置了源，升级时会覆盖原来的systemctl配置文件，因为打包环境，我安装了多版本的java
解决办法

vim /lib/systemd/system/jenkins.service
Environment="JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64"

就可以了，如果你指定了工作目录还需要修改下

Environment="JENKINS_HOME=/data/jenkins_data"
WorkingDirectory=/data/jenkins_data

上面的方式会导致每次更新都需要修改，建议直接修改下面的配置文件解决问题！

vim /etc/default/jenkins

然后执行

systemctl daemon-reload
systemctl start jenkins