This add-on is operated by Stackhero

Redis® on dedicated instances, up-to-date versions and super attractive prices.

Last updated July 14, 2022

Stackhero for Redis provides a managed Redis instance running on a fully dedicated instance.

The Stackhero for Redis add-on provides the following features:

• A private instance (dedicated VM)
• A dedicated public IP (v4)
• TLS encryption (aka SSL)
• An automatic backup every 24 hours
• A graphical web UI (Redis Commander)
• One click to update to new Redis versions

Provisioning the Add-on

Stackhero for Redis can be attached to a Heroku application via the CLI:

$ heroku addons:create ah-redis-stackhero --app <your app name>
-----> Adding ah-redis-stackhero to sharp-mountain-4005... done

After provisioning Stackhero for Redis, the STACKHERO_REDIS_URL_TLS and STACKHERO_REDIS_URL_CLEAR config variables are available in your app’s configuration. They contain the URLs to your Redis instance.

• STACKHERO_REDIS_URL_TLS - the URL to your Redis instance with TLS encryption. We recommend you chose a library that supports TLS encryption.
• STACKHERO_REDIS_URL_CLEAR - the URL to your Redis instance with no encryption (clear).

Review config var values with the heroku config:get CLI command:

$ heroku config:get STACKHERO_REDIS_URL_TLS
rediss://user:password@domain:port

Local Setup

Use the Heroku Local command-line tool to configure, run, and manage process types specified in your app’s Procfile. Heroku Local reads configuration variables from an .env file. Use heroku config to view your app’s config variables. Use the following command for each value that you want to add to your .env file:

heroku config:get <STACKHERO_REDIS_VARIABLE> -s  >> .env

For example:

$ heroku config:get STACKHERO_REDIS_URL_TLS -s  >> .env
$ heroku config:get STACKHERO_REDIS_URL_CLEAR -s  >> .env

For more information, see Heroku Local.

Connecting to Redis

There are Redis clients for most popular programming language. We recommend you chose a library that supports TLS encryption.

Connecting with Java

You can use the environment variable STACKHERO_REDIS_URL_TLS to connect to Redis.

Here’s an example of a connection using Jedis:

private static Jedis getConnection() throws URISyntaxException {
  URI redisURI = new URI(System.getenv("STACKHERO_REDIS_URL_TLS"));
  Jedis jedis = new Jedis(redisURI);
  return jedis;
}

For more information about Jedis, see the official Jedis repository and the official wiki.

In a multithreaded environment, like a webserver, use Jedis Pool:

public static JedisPool getPool() {
  URI redisURI = new URI(System.getenv("STACKHERO_REDIS_URL_TLS"));
  JedisPoolConfig poolConfig = new JedisPoolConfig();
  poolConfig.setMaxTotal(10);
  poolConfig.setMaxIdle(5);
  poolConfig.setMinIdle(1);
  poolConfig.setTestOnBorrow(true);
  poolConfig.setTestOnReturn(true);
  poolConfig.setTestWhileIdle(true);
  JedisPool pool = new JedisPool(poolConfig, redisURI);
  return pool;
}

For more information about using Jedis in a multi-threaded environment, see the Jedis wiki.

Connecting with Ruby

Install the Redis gem:

$ gem 'redis'
$ bundle install

For more information about the Ruby Redis gem, see the Ruby Redis repository.

With Rails, you have to create the initializer file config/initializers/redis.rb:

$redis = Redis.new(url: ENV["STACKHERO_REDIS_URL_TLS"])

Connecting with Python

Install the Redis package:

$ pip install redis
$ pip freeze > requirements.txt

import os
import redis

r = redis.from_url(os.environ.get("STACKHERO_REDIS_URL_TLS"))

For more information about the Python Redis package, see the Python redis package documentation.

Connecting with PHP

Retrieve the URL with getenv('STACKHERO_REDIS_URL_TLS') and pass it to your preferred Redis client library.

Connecting with Go

First install the go-redis package:

$ go get github.com/go-redis/redis/v8

Then, import it in your code:

import "github.com/gomodule/redigo/redis"

Finally, connect to the Redis server using the STACKHERO_REDIS_URL_TLS variable:

opt, err := redis.ParseURL(os.Getenv("STACKHERO_REDIS_URL_TLS"))
if err != nil {
    panic(err)
}

rdb := redis.NewClient(opt)

For more information about using the Go Redis package, see the go-redis repository.

Connecting with Node.js

We recommend using ioredis.

Install the ioredis package:

$ npm install ioredis

const Ioredis = require('ioredis');

(async () => {

  const redis = new Ioredis(process.env.STACKHERO_REDIS_URL_TLS);

  // Set key "stackhero-example-key" to "abcd"
  await redis.set('stackhero-example-key', 'abcd');

  // Get key "stackhero-example-key"
  const value = await redis.get('stackhero-example-key');
  console.log(`Key "stackhero-example-key" has value "${value}"`);

  // Finally delete key "stackhero-example-key"
  await redis.del('stackhero-example-key');

})().catch(error => {
  console.error('An error occurred!', error);
});

For more examples, see the ioredis repository.

Dashboard and Web UI (Redis Commander)

You can see your instance usage, restart your instance, and apply updates from the Stackhero dashboard. You can also access the Redis console web UI.

Access the dashboard via the CLI:

$ heroku addons:open ah-redis-stackhero
Opening ah-redis-stackhero for sharp-mountain-4005

You can also visit the Heroku Dashboard, select your application, and then select Stackhero for Redis from the Add-ons menu.

Set Eviction Policy

The eviction policy specifies how Redis reacts when you consume more memory than available on your plan. To specify an eviction policy, connect to your Stackhero dashboard, select your Redis service, select Configure, and then specify the Eviction policy.

Upgrading Your Plan

Use the heroku addons:upgrade command to migrate to a new plan.

$ heroku addons:upgrade ah-redis-stackhero:newplan
-----> Upgrading ah-redis-stackhero:newplan to sharp-mountain-4005... done
       Your plan has been updated to: ah-redis-stackhero:newplan

Removing the Add-on

You can remove Stackhero for Redis via the CLI:

$ heroku addons:destroy ah-redis-stackhero
-----> Removing ah-redis-stackhero from sharp-mountain-4005... done

Support

Stackhero for Redis support and runtime issues should be submitted via one of the Heroku Support channels. We recommend adding support@stackhero.io in copy for urgent issues.

Additional Resources

• Redis documentation by Stackhero
• Redis managed cloud