修改rsession.conf配置文件后，无法登陆Rstudio

写在前面

问题经常有，今年特别多。
也不知道是不是因为centos系统的原因，为啥明明我还在跑着程序，2个小时后，RStudio server自动退出登陆界面了。于是通过查询得知，可以通过修改/etc/rstudio/rsession.conf文件，让用户session 将不会suspend，一直运行。

正文

修改rsession.conf文件

vim /etc/rstudio/rsession.conf
添加session-timeout-minutes=0#会话超时时间

接着我尝试重启Rstudio server让其生效

rstudio-server restart #重启

后来就遇到了发现登不进Rstudio server了，但是xshell均正常。

检查Rstudio server 状态

sudo systemctl status rstudio-server

###报错信息
● rstudio-server.service - RStudio Server
   Loaded: loaded (/usr/lib/systemd/system/rstudio-server.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 一 2021-04-12 09:05:11 CST; 3min 52s ago
  Process: 170465 ExecStop=/usr/bin/killall -TERM rserver (code=exited, status=0/SUCCESS)
  Process: 217615 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS)
 Main PID: 217616 (code=exited, status=1/FAILURE)
    Tasks: 1
   CGroup: /system.slice/rstudio-server.service
           └─147061 /usr/lib/rstudio-server/bin/rserver

4月 12 09:05:11 localhost.localdomain systemd[1]: Unit rstudio-server.service entered failed state.
4月 12 09:05:11 localhost.localdomain systemd[1]: rstudio-server.service failed.
4月 12 09:05:11 localhost.localdomain systemd[1]: rstudio-server.service holdoff time over, scheduling restart.
4月 12 09:05:11 localhost.localdomain systemd[1]: Stopped RStudio Server.
4月 12 09:05:11 localhost.localdomain systemd[1]: start request repeated too quickly for rstudio-server.service
4月 12 09:05:11 localhost.localdomain systemd[1]: Failed to start RStudio Server.
4月 12 09:05:11 localhost.localdomain systemd[1]: Unit rstudio-server.service entered failed state.
4月 12 09:05:11 localhost.localdomain systemd[1]: rstudio-server.service failed.
[root@localhost rstudio]# sudo systemctl stop rstudio-server
[root@localhost rstudio]# sudo systemctl start rstudio-server
[root@localhost rstudio]# sudo systemctl status rstudio-server
● rstudio-server.service - RStudio Server
   Loaded: loaded (/usr/lib/systemd/system/rstudio-server.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since 一 2021-04-12 09:10:24 CST; 1s ago
  Process: 170465 ExecStop=/usr/bin/killall -TERM rserver (code=exited, status=0/SUCCESS)
  Process: 218168 ExecStart=/usr/lib/rstudio-server/bin/rserver (code=exited, status=0/SUCCESS)
 Main PID: 218169 (code=exited, status=1/FAILURE)
    Tasks: 1
   CGroup: /system.slice/rstudio-server.service
           └─147061 /usr/lib/rstudio-server/bin/rserver

去google了比较多帖子，都没有找到一个合适的办法，最终在Stack Overflow里面找到解决办法

原因解析

The reason why you can not restart rstudio-server is that the PORT 8787 was been using by previous rserver. After knowing this, the solution is easy. First, check the pid that was using PORT 8787

简单来说就是原8787端口被其他资源占用了，把占用的程序kill掉就解决了

解决办法

#查看占用端口
sudo netstat -anp | grep 8787
# tcp        0      0 0.0.0.0:8787            0.0.0.0:*               LISTEN      pid/rserver

#Second, kill this pid (use your pid)
sudo kill -9 <pid> 

#Third, restart rstudio-server or reinstall resutio server package
rstudio-server restart #重启

至此，问题解决， RStudio Server也顺利登陆。