node.js and Redis on Heroku for IODocs
题
I'm trying to get IODocs running on Heroku. It requires node.js and Redis. Admittedly, I'm new to all of these technologies. Nonetheless, I've managed to get it running locally. However, I receive the following error when deploying to Heroku.
2011-12-01T11:55:18+00:00 app[web.1]: Redis To Go - port: 9030 hostname: dogfish.redistogo.com
2011-12-01T11:55:18+00:00 app[web.1]: Express server listening on port 9694
2011-12-01T11:55:19+00:00 heroku[web.1]: State changed from starting to up
2011-12-01T11:55:21+00:00 app[web.1]: ^
2011-12-01T11:55:21+00:00 app[web.1]: Error: Redis connection to localhost:6379 failed - ECONNREFUSED, Connection refused
2011-12-01T11:55:21+00:00 app[web.1]: at Socket.<anonymous> (/app/node_modules/redis/index.js:123:28)
2011-12-01T11:55:21+00:00 app[web.1]: at Socket.emit (events.js:64:17)
2011-12-01T11:55:21+00:00 app[web.1]: at Array.<anonymous> (net.js:828:27)
2011-12-01T11:55:21+00:00 app[web.1]: at EventEmitter._tickCallback (node.js:126:26)
2011-12-01T11:55:23+00:00 heroku[web.1]: State changed from up to crashed
The only time I received a similar warning on my local mating was when Redis was not running. From what I can tell the Redis add-on is enabled for my app and running:
$ heroku config --long
NODE_ENV => production
PATH => bin:node_modules/.bin:/usr/local/bin:/usr/bin:/bin
REDISTOGO_URL => redis://redistogo:52847221366cb677460c306e4f482c5b@dogfish.redistogo.com:9030/
I've also tried some configuration suggestions. Neither seem to work.
// redis connection in app.js
var db;
if (process.env.REDISTOGO_URL) {
var rtg = require("url").parse(process.env.REDISTOGO_URL);
// tried this line as well... gave a different error on .connect();
// db = require('redis-url').connect(process.env.REDISTOGO_URL);
db = redis.createClient(rtg.port, rtg.hostname);
db.auth(rtg.auth.split(":")[1]);
// debug
sys.puts('Redis To Go - port: ' + rtg.port + ' hostname: ' + rtg.hostname);
} else {
db = redis.createClient(config.redis.port, config.redis.host);
db.auth(config.redis.password);
}
From the difference in my Redis To Go debug line and Error, I'm sure this is a configuration issue. But don't know how to fix it. Any help is greatly appreciated.
解决方案 2
This indeed had to do with the configuration for Redis on Heroku. There were additional lines that required updates in I/O Docs app.js.
In the end, I piggy-backed the global config
object at the top (~ line 60) after sniffing out the production (Heroku) environment.
if (process.env.REDISTOGOURL) {
// use production (Heroku) redis configuration
// overwrite config to keep it simple
var rtg = require(‘url’).parse(process.env.REDISTOGOURL);
config.redis.port = rtg.port;
config.redis.host = rtg.hostname;
config.redis.password = rtg.auth.split(“:”)[1];
}
I created a blog post for installing, configuring, and deploying I/O Docs that includes this as well as other changes that were required to run I/O Docs. I recommend you review it if you're interested in this project.
Thanks to Jan Jongboom and Kirsten Jones for helping me get started. In addition, I believe the project has been updated on GitHub to include Heroku configuration out of the box. However, I've yet to test it.
其他提示
According to this line:
2011-12-01T11:55:21+00:00 app[web.1]: Error: Redis connection to localhost:6379 failed - ECONNREFUSED, Connection refused
You are trying to connect to localhost:6379
, but the redis server is running at redis://redistogo:52847221366cb677460c306e4f482c5b@dogfish.redistogo.com:9030/
. Can you try connecting to that URL manually and see if that works?
I actually have a blog post about how to get IODocs working on Heroku. It's got the config changes needed to get the REDIS working on Heroku with IODocs.
http://www.princesspolymath.com/princess_polymath/?p=489
Here's the code changes needed: Add the following block under “var db;” to app.'s:
if (process.env.REDISTOGO_URL) {
var rtg = require("url").parse(process.env.REDISTOGO_URL);
db = require("redis").createClient(rtg.port, rtg.hostname);
db.auth(rtg.auth.split(":")[1]);
} else {
db = redis.createClient(config.redis.port, config.redis.host);
db.auth(config.redis.password);
}
And then this in the Load API Configs section, after reading the config file:
var app = module.exports = express.createServer();
var hostname, port, password
if (process.env.REDISTOGO_URL) {
var rtg = require("url").parse(process.env.REDISTOGO_URL);
hostname = rtg.hostname;
port = rtg.port;
password = rtg.auth.split(":")[1];
} else {
hostname = config.redis.host;
port = config.redis.port;
password = config.redis.password;
}
Recently, a cleaner way would be to use the redis-url module which handles the configuration.
I'm personnaly using Express with Redis (via the Redis To Go addon) as a sessionStore, and it works well on Heroku.
Exemple :
const express = require('express')
, redis = process.env.REDISTOGO_URL
? require('redis-url').connect(process.env.REDISTOGO_URL)
: require('redis').createClient()
, RedisStore = require('connect-redis')(express)
, sessionStore = new RedisStore({ client: redis })
, app = express.createServer();
[...]
app.configure(function() {
this
.use(express.session({
secret: 'mySecretHash',
store: sessionStore // Set redis as the sessionStore for Express
}));
});