fixed #3218

src/database/mongo.js

@@ -8,6 +8,7 @@
 		nconf = require('nconf'),
 		session = require('express-session'),
 		_ = require('underscore'),
+		semver = require('semver'),
 		db, mongoClient;
 
 	_.mixin(require('underscore.deep'));
@@ -137,6 +138,7 @@
 			}
 
 			function createIndices() {
+				winston.info('[database] Checking database indices.')
 				async.parallel([
 					async.apply(createIndex, 'objects', {_key: 1, score: -1}, {background: true}),
 					async.apply(createIndex, 'objects', {_key: 1, value: -1}, {background: true, unique: true, sparse: true}),
@@ -164,6 +166,17 @@
 		});
 	};
 
+	module.checkCompatibility = function(callback) {
+		// For MongoDB, we need to ensure that the mongodb package is >= 2.0.0
+		var mongoPkg = require.main.require('./node_modules/mongodb/package.json'),
+			err = semver.lt(mongoPkg.version, '2.0.0') ? new Error('The `mongodb` package is out-of-date, please run `./nodebb setup` again.') : null;
+
+		if (err) {
+			err.stacktrace = false;
+		}
+		callback(err);
+	};
+
 	module.info = function(db, callback) {
 		db.stats({scale:1024}, function(err, stats) {
 			if(err) {

src/database/redis.js

@@ -5,6 +5,7 @@
 	var winston = require('winston'),
 		nconf = require('nconf'),
 		path = require('path'),
+		semver = require('semver'),
 		session = require('express-session'),
 		utils = require('./../../public/src/utils.js'),
 		redis,
@@ -111,6 +112,17 @@
 		return cxn;
 	};
 
+	module.checkCompatibility = function(callback) {
+		// Redis requires v2.8.9
+		module.info(module.client, function(err, info) {
+			var err = semver.lt(info.redis_version, '2.8.9') ? new Error('Your Redis version is not new enough to support NodeBB, please upgrade Redis to v2.8.9 or higher.') : null;
+			if (err) {
+				err.stacktrace = false;
+			}
+			callback(err);
+		});
+	};
+
 	module.close = function() {
 		redisClient.quit();
 	};