Unhandled error event: Error: connect ECONNREFUSED

Unhandled error event: Error: connect ECONNREFUSED

我正在使用 pm2 来确保 laravel-echo-server 是 运行。执行 pm2 logs 0 给我一些错误。我是 运行 Google Compute Engine 实例上的服务器,并设置了一些防火墙入口规则。

0|echo-ser | ⚠ Starting server in DEV mode... 
0|echo-ser | 
0|echo-ser | ✔ Running at localhost on port 6001 
0|echo-ser | ✔ Channels are ready. 
0|echo-ser | ✔ Listening for http events... 
0|echo-ser | 
0|echo-ser | L A R A V E L E C H O S E R V E R 
0|echo-ser | 
0|echo-ser | version 1.5.0 
0|echo-ser | 
0|echo-ser | ⚠ Starting server in DEV mode... 
0|echo-ser | 
0|echo-ser | ✔ Running at localhost on port 6001 
0|echo-ser | ✔ Channels are ready. 
0|echo-ser | ✔ Listening for http events...

/root/.pm2/logs/echo-server-error.log last 15 lines: 
0|echo-ser | at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1191:14) 
0|echo-ser | [ioredis] Unhandled error event: Error: connect ECONNREFUSED 127.0.0.1:6379 

如果我安装了 redis-server 并且 运行...