使用 Passenger + Nginx

发现运行一段时间后，查看日志发现 ActionCable Finished 之后不再 Start

运行 rvmsudo passenger-status, 打印结果部分如下：

Requests in queue: 0
 * PID: 19277   Sessions: 8       Processed: 111     Uptime: 8d 19h 45m 48s
   CPU: 0%      Memory  : 54M     Last used: 1h 3
 * PID: 19288   Sessions: 8       Processed: 218     Uptime: 8d 19h 45m 48s
   CPU: 0%      Memory  : 51M     Last used: 28m 
 * PID: 19300   Sessions: 8       Processed: 115     Uptime: 8d 19h 45m 48s
   CPU: 0%      Memory  : 50M     Last used: 59m