1、Jenkins启动，但未建立监听端口和未查到对应服务进程

 

2、经排查发现日志文件清空后，未宿主文件权限授予给jenkins账号，导致读写访问异常。

3、最终发现/var/log/jenkins创建的日志文件没有授权给jenkins用户。

chown -R jenkins:jenkins /var/log/jenkins

4、再使用service jenkins start，启动后如下：

[root@oracle jenkins]# service jenkins status
● jenkins.service - LSB: Jenkins Automation Server
   Loaded: loaded (/etc/rc.d/init.d/jenkins; bad; vendor preset: disabled)
   Active: active (running) since Mon 2021-01-11 16:18:24 CST; 49min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 5849 ExecStop=/etc/rc.d/init.d/jenkins stop (code=exited, status=0/SUCCESS)
  Process: 8617 ExecStart=/etc/rc.d/init.d/jenkins start (code=exited, status=0/SUCCESS)
    Tasks: 62
   CGroup: /system.slice/jenkins.service
           └─8659 /etc/alternatives/java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=true -DJENKINS_HOME=/var/lib/jenkins -jar /usr/lib/jenkins/jenkins.war --logfile=/var/log/jenkins/jenkins.log --webroot=/var/cache/jenkins...

Jan 11 16:18:24 oracle systemd[1]: Starting LSB: Jenkins Automation Server...
Jan 11 16:18:24 oracle runuser[8622]: pam_unix(runuser:session): session opened for user jenkins by (uid=0)
Jan 11 16:18:24 oracle runuser[8622]: pam_unix(runuser:session): session closed for user jenkins
Jan 11 16:18:24 oracle jenkins[8617]: Starting Jenkins [  OK  ]
Jan 11 16:18:24 oracle systemd[1]: Started LSB: Jenkins Automation Server.

5、查看访问端口状态

[root@oracle jenkins]# lsof -i:8088

COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME

java    8659 jenkins  159u  IPv6 472641      0t0  TCP *:radan-http (LISTEN)

6、查看启动服务进程是否运行

[root@oracle jenkins]# ps -ef|grep jenkins

jenkins   8659     1 88 16:18 ?        00:00:53 /etc/alternatives/java -Dcom.sun.akuma.Daemon=daemonized -Djava.awt.headless=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=8088 --debug=5 --handlerCountMax=100 --handlerCountMaxIdle=20

root      8967 23126  0 16:19 pts/0    00:00:00 grep --color=auto jenkins