REDIS-HA With Sentinels

use a Strong Password Port Can be Changed set IPs in .env file

Separating Read and Write Redis Connection in .net core application

In this section, We want to describe how to separate the Redis connection in the .net core application.

When you are using Redis Search you may have a heavy load on your Redis server, in 'sentinel' you only connect with the 'Master' Redis server.

On the other hand, you can't write on 'Replica's, because replicas are read-only. In this scenario to balance your Redis server load you have to have a load balancer to read from Redis replicas.

Consider we have the following structure for our Redis servers:

Creating a Redis connection factory

We have created a connection factory as follows:

public class RedisConnectionFactory
{
	private readonly ConnectionMultiplexer _readConnection;
	private readonly ConnectionMultiplexer _writeConnection;

	public RedisConnectionFactory(ConnectionMultiplexer readConnection, ConnectionMultiplexer writeConnection)
	{
		_readConnection = readConnection;
		_writeConnection = writeConnection;
	}
	public ConnectionMultiplexer GetReadConnection()
	{
		return _readConnection;
	}
	public ConnectionMultiplexer GetWriteConnection()
	{
		return _writeConnection;
	}
}

You find the above code in in the following URL:

https://github.com/maleki-it/Redis_Ha/blob/add-dotnet-api-example/RediSearch_webapi/Factories/RedisConnectionFactory.cs

Creating a Read Connection

		var replicaConfig = new ConfigurationOptions()
		{
			Password = redisConnectionConfig.Password,
		};
		foreach (var endPoint in redisConnectionConfig.ReplicaAddresses)
		{
			replicaConfig.EndPoints.Add(endPoint);
		}
		ConnectionMultiplexer readConnectionMux = ConnectionMultiplexer.Connect(replicaConfig);

You can also create your read Connection in the following way:👇👇

ConnectionMultiplexer readConnectionMux = ConnectionMultiplexer.Connect("replica1,replica2,replica3,...,replica2n;Password=YourStrongPassword")

Creating a Write Connection

In this scenario, you have to create a "Sentinel" Connection:

		var sentinelConfig = new ConfigurationOptions()
		{

			Password = redisConnectionConfig.Password,

		};
		foreach (var endPoint in redisConnectionConfig.SentinelAddresses)
		{
			sentinelConfig.EndPoints.Add(endPoint);
		}
		var sentinelConnection = ConnectionMultiplexer.SentinelConnect(sentinelConfig);
		var masterConfig = new ConfigurationOptions()
		{
			ServiceName = "mymaster",
			Password = redisConnectionConfig.Password,
			AllowAdmin = true
		};
		var masterConnection = sentinelConnection.GetSentinelMasterConnection(masterConfig);

You can find the full configuration in this URL: 👇👇

https://github.com/maleki-it/Redis_Ha/blob/add-dotnet-api-example/RediSearch_webapi/RedisConnectionRegistrationExtenstion.cs