systemctl start jenkins命令启动Jenkins后，提示错误
jenkins构建时错误：Job for jenkins.service failed becasused a timeout was exceeded
错误信息如下：
现在用第二条命令journalctl -xe
2.错误原因
发生此问题的原因是用户无权在目录/var/libs/jenkins上执行作业
如果不知道jenkins具体在哪里。使用如下命令：
find / -iname jenkins
3.解决方案
获取给对应的目录权限：
chown -R root /var/log/jenkins chgrp -R root /var/log/jenkins chown -R root /var/lib/jenkins chgrp -R root /var/lib/jenkins chown -R root /var/cache/jenkins chgrp -R root /var/cache/jenkins