VNC配置端口占用

问题描述：

配置VNC环境时 执行systemctl配置端口发现有些端口被占用

systemctl status vncserver-user@:2.service
\u25cf vncserver-dgq@:2.service - Remote desktop service (VNC)
   Loaded: loaded (/etc/systemd/system/vncserver-dgq@.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2021-04-14 14:12:02 CST; 25s ago
 Main PID: 55080 (code=exited, status=2)

Apr 14 14:12:02 SEU.IC1 systemd[1]: Starting Remote desktop service (VNC)...
Apr 14 14:12:02 SEU.IC1 systemd[1]: Started Remote desktop service (VNC).
Apr 14 14:12:02 SEU.IC1 vncserver_wrapper[55080]: A VNC server is already running as :2
Apr 14 14:12:02 SEU.IC1 vncserver_wrapper[55080]: FATAL: 'runuser -l dgq' failed!
Apr 14 14:12:02 SEU.IC1 systemd[1]: vncserver-dgq@:2.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 14 14:12:02 SEU.IC1 systemd[1]: Unit vncserver-dgq@:2.service entered failed state.
Apr 14 14:12:02 SEU.IC1 systemd[1]: vncserver-dgq@:2.service failed.

发现VNC server 2端口已经被占用，因此执行

root@SEU ~]# /usr/sbin/lsof -i tcp:5902
COMMAND   PID USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
Xvnc    48138  dgq    9u  IPv4 3035358      0t0  TCP *:5902 (LISTEN)
Xvnc    48138  dgq   10u  IPv6 3035359      0t0  TCP *:5902 (LISTEN)

或者

[root@testdb ~]# ps -ef | grep -i vnc | grep -v grep

查看该端口

---

解决方案：

直接vncserver -kill ：端口号

[root@SEU ~]# vncserver -kill :2

Can't find file /root/.vnc/SEU.IC1:2.pid
You'll have to kill the Xvnc process manually

后面发现占用的用户不是root，因此需要切换相关用户去杀掉。
或者直接干脆一点，用kill语句杀掉。

[root@testdb ~]# kill -9 48138

后面systemctl配置发现还是报错，

[root@SEU ~]# systemctl status vncserver-dgq@:2.service
\u25cf vncserver-dgq@:2.service - Remote desktop service (VNC)
   Loaded: loaded (/etc/systemd/system/vncserver-dgq@.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2021-04-14 14:23:39 CST; 19s ago
 Main PID: 56579 (code=exited, status=2)

Apr 14 14:23:39 SEU.IC1 systemd[1]: Starting Remote desktop service (VNC)...
Apr 14 14:23:39 SEU.IC1 systemd[1]: Started Remote desktop service (VNC).
Apr 14 14:23:39 SEU.IC1 vncserver_wrapper[56579]: Warning: SEU.IC1:2 is taken because of /tmp/.X2-lock
Apr 14 14:23:39 SEU.IC1 vncserver_wrapper[56579]: Remove this file if there is no X server SEU.IC1:2
Apr 14 14:23:39 SEU.IC1 vncserver_wrapper[56579]: A VNC server is already running as :2
Apr 14 14:23:39 SEU.IC1 vncserver_wrapper[56579]: FATAL: 'runuser -l dgq' failed!
Apr 14 14:23:39 SEU.IC1 systemd[1]: vncserver-dgq@:2.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 14 14:23:39 SEU.IC1 systemd[1]: Unit vncserver-dgq@:2.service entered failed state.
Apr 14 14:23:39 SEU.IC1 systemd[1]: vncserver-dgq@:2.service failed.

从报错信息可以看出是部分缓存文件没有清除，root直接清掉，后面VNC配置就没问题了。