Laravel Redis Sentinel

This provides a Sentinel aware driver for Laravel. A Redis cluster with Sentinels supports a high availability Master/Slave architecture that provides automatic failover should a node stop working.

It's simple code and merely allows you to configure Sentinels correctly by changing some assumptions Laravel makes about how you're using Redis.

Compatibility

Version	Supported Laravel Version
^0.0	^5.2
^1.0	^5.3

Installation

Add the Service provider to your config/app.php, you should also comment out (or remove) the default illuminate Redis driver:

'providers' => [

    // Illuminate\Redis\RedisServiceProvider::class,

    ...

    RedisSentinel\Laravel\RedisSentinelServiceProvider::class,
]

Point your Redis database at a set of Redis Sentinels. Change the redis part of your config/database.php to something like:

'redis' => [

    'cluster' => false,

    'default' => [
        [
            'host' => env('REDIS_SENTINEL_1'),
            'port' => 26379
        ],
        [
            'host' => env('REDIS_SENTINEL_2'),
            'port' => 26379
        ],
        [
            'host' => env('REDIS_SENTINEL_3'),
            'port' => 26379
        ],
        'options' => [
            'replication' => 'sentinel',
            'service' => 'mymaster',
            'parameters' => [
                'database' => 0,
                'password' => env('REDIS_PASSWORD', null)
            ]
        ]
    ],

    // optional configuration for a separate Redis 'database' for just a cache
    'cache' => [
        [
            'host' => env('REDIS_SENTINEL_1'),
            'port' => 26379
        ],
        [
            'host' => env('REDIS_SENTINEL_2'),
            'port' => 26379
        ],
        [
            'host' => env('REDIS_SENTINEL_3'),
            'port' => 26379
        ],
        'options' => [
            'replication' => 'sentinel',
            'service' => 'mymaster',
            'parameters' => [
                'database' => 1, // note the differing 'database' number
                'password' => env('REDIS_PASSWORD', null)
            ]
        ]
    ],

    'options' => [
    ]

],

Optionally you can add a configuration option that causes Predis to interrogate a given Sentinel for a complete list of Sentinels. If you do this then you only need to provide a single Sentinel in the configuration. Predis will ensure that the Sentinel list is kept up to date on subsequent queries.

'default' => [
    [
        'host' => env('REDIS_SENTINEL'),
        'port' => 26379
    ],
    'options' => [
        'replication' => 'sentinel',
        'service' => 'mymaster',
        'update_sentinels' => true,
        'parameters' => [
            'database' => 0,
            'password' => env('REDIS_PASSWORD', null)
        ]
    ]
],

Queue

Add a connection to your config/queue.php file:

'connections' => [

    ...

    'sentinel' => [
        'driver' => 'sentinel-redis',
        'connection' => 'default', // or any other named 'database' you define in database.php
        'queue' => 'default',
        'retry_after' => 90,
    ],
],

Configure your env file to use the new driver:

QUEUE_DRIVER=sentinel

Cache

Laravel will quite happily use Redis as a cache location. What they don't tell you is that clearing your cache does a simplistic FLUSHDB command. Something you don't want to use if you're also using queues in Redis. "Oh no, all my queued jobs have disappeared".

To fix this setup a cache database configuration as shown in the example config/database.php snippet above, ensuring that you use a different database number and change the Redis section of config/cache.php to read:

'redis' => [
    'driver' => 'redis',
    'connection' => 'cache', \\ make sure this matches the name you gave your 'database'
],

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