Laravel: how to separate cache and session into different redis database? - php

Question

I want to put session and cache data into redis. This is my configuration in database.php:
'redis' => array(
'cluster' => false,
'default' => array(
'host' => '192.168.56.101',
'port' => 6379,
'database' => 0,
),
'session' => array(
'host' => '192.168.56.101',
'port' => 6379,
'database' => 1,
),
),
session.php:
return array(
'driver' => 'redis',
'connection' => 'session',
);
cache.php:
'driver' => 'redis',
However, where I write code like this:
Cache::remember('aa',1,function(){
return 'bb';
});
cache driver uses the same redis database as session driver does, which results in:
127.0.0.1:6379[1]> keys *
1) "aa"
2) "e0606244bec40b0352fb2b7b65d98049e49f6189"
Anyone knows how to force cache to use a specific redis connection? Or I have to mix them up together?

Answer 1

Introduction
Here is my note, for some other guy who running in to this problem, I think this is should be in the docs.
By default, redis gives you 16 separate databases, but laravel out of the box will try to use database 0 for both sessions and cache.
Our solution is to let Redis caching using database 0, and database 1 for Session, there for solving the session clear by running php artisan cache:clear problem.
Note: Tested at Laravel 5.1
1. Setting up Session Redis connection
Modify config/database.php, add session key to the redis option:
'redis' => [
'cluster' => false,
'default' => [
'host' => env('REDIS_HOST', 'localhost'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => 0,
],
'session' => [
'host' => env('REDIS_HOST', 'localhost'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => 1,
],
],
2. Make use of the session connection
Modify config/session.php, change the following:
'connection' => null,
to:
'connection' => 'session',
3. Using Redis as session driver
Modify .env, change SESSION_DRIVER:
SESSION_DRIVER=redis
4. Testing out
Execute the following artisan command, then check your login state:
php artisan cache:clear
If the login state persists, voilà!

Answer 2

Laravel 5.5:
database.php should look like this:
'redis' => [
'client' => 'predis',
'default' => [
'host' => env('REDIS_HOST', '127.0.0.1'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => 0,
],
'session' => [
'host' => env('REDIS_HOST', '127.0.0.1'),
'password' => env('REDIS_PASSWORD', null),
'port' => env('REDIS_PORT', 6379),
'database' => 1,
],
],
And in the session.php you have to update also the key "connection" to the right key. In this case 'session'
'connection' => 'session',

Answer 3

Laravel 5 now supports this.
https://github.com/laravel/framework/commit/d10a840514d122fa638eb5baa24c8eae4818da3e
You can select redis connection by modifying config/cache.php
'stores' => [
'redis' => [
'driver' => 'redis',
'connection' => 'your-connection-name',
],
],
Laravel 4 CacheManager does not support selecting redis connection.
What you need to do is to modify/extend CacheManager and override createRedisDriver() method.
Modify this line
return $this->repository(new RedisStore($redis, $this->getPrefix()));
To
return $this->repository(
new RedisStore($redis, $this->getPrefix(),
$this->app['config']['cache.redis'])
);
Now you can define your configuration in cache.php
'redis' => 'your-connection-name'