Redis & NodeJS - Connection exception

Question

I'm using Redis DB with NodeJS. Occasionally I get below exception and my server (NodeJS) crashes only to restart again.

Error: Redis connection to localhost:6380 failed - getaddrinfo ENOTFOUND

Can someone explain why this happens? Does the below config has something to do with this?

# Set the max number of connected clients at the same time. By default
# this limit is set to 10000 clients, however if the Redis server is not
# able ot configure the process file limit to allow for the specified limit
# the max number of allowed clients is set to the current file limit
# minus 32 (as Redis reserves a few file descriptors for internal uses).
#
# Once the limit is reached Redis will close all the new connections sending
# an error 'max number of clients reached'.
#
# maxclients 10000

Answer 1

This simply means your redis server isn't running; at least not on that address/port.

Start your server using

$ redis-server path/to/redis.conf

Also the default redis port is 6379. If you're using 6380 in your scripts, make sure redis is listening on that port.

---

If something in your script is causing the redis server to crash, you can try listening for errors to get some more sensible output

var redis  = require("redis"),
    client = redis.createClient(6380, "localhost");

client.on("error", function (err) {
  console.log("Redis error encountered", err);
});

client.on("end", function() {
  console.log("Redis connection closed");
});