Ruby on rails nginx启动错误，轨道乘客

当我尝试在vps中启动nginx时，它显示以下错误。我正在使用centos vps

[sarath@vps111 ~]$ sudo service nginx restart
nginx: the configuration file /opt/nginx/conf/nginx.conf syntax is ok
nginx: [alert] Unable to start the Phusion Passenger watchdog because it encountered the following error during startup: Unable to start the Phusion Passenger helper agent: it seems to have crashed during startup for an unknown reason, with exit code 1 (-1: Unknown error)
nginx: configuration file /opt/nginx/conf/nginx.conf test is successful
Stopping nginx:                                            [  OK  ]
Starting nginx: nginx: [alert] Unable to start the Phusion Passenger watchdog because it encountered the following error during startup: Cannot create a Unix socket pair: Cannot allocate memory (errno=12) (-1: Unknown error)

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此错误是否与nginx、操作系统或特定于硬件相关？有什么解决方案吗？

请关闭该服务，然后重新启动

$ ps -A | grep -i passenger | xargs kill -9 

如果出现错误，请尝试使用sudo

如果此命令不起作用，请执行以下操作：

$ kill -9 $(pgrep Passenger)

通常，当另一个实例正在运行时，我会遇到此错误