withAuthentication(String, CharSequence) usage in sentinel authentication ?

[Pramit2512]

I recently noticed in lettuce docs that below usage is deprecated

sentinel(String host, int port, String masterId, CharSequence password)
Deprecated. since 6.0,
use sentinel(String, int, String) and withAuthentication(String, CharSequence) instead.

and when i check public RedisURI.Builder withAuthentication(String username, CharSequence password)

I am not able to understand the String username in parameter list for method withAuthentication . What is it ,and how can we get this/configure this .Is this any random string or sentinel username .if so how can we set/get the sentinel username from config file.
I have never seen username usage before.Can anyone please explain?

[mp911de]

With Lettuce 6.0, we introduced support for Redis 6 ACL's. The correct way to setup sentinel with authentication is RedisURI.Builder.sentinel(host, port).withPassword(…) or RedisURI.Builder.sentinel(host, port).withAuthentication(username, password).

[Pramit2512]

@mp911de , I have already tried using RedisURI.Builder.sentinel(host, port).withPassword(…) but i am still getting Caused by: io.lettuce.core.RedisCommandExecutionException: NOAUTH Authentication required.

My sentinel and data nodes both are password protected .Below is my connection code.It works when i have setup the master password only in master config file .As soon as i introduce sentinel password also ,it fails.

`  RedisURI.Builder
                        .sentinel(getSentinelHost_1(), getSentinelPort_1())
                        .withPassword(getSentinelPassword())
                        .withSentinel(getSentinelHost_2(), getSentinelPort_2())
                        .withSentinel(getSentinelHost_3(), getSentinelPort_3())
                        .withSentinelMasterId(getMasterName()).withPassword(getMasterPassword())
                        .build())`

Note::I am able to connect to redis if i am using deprecated version of sentinel authentication

  RedisURI.Builder
                       .sentinel(getSentinelHost_1(), getSentinelPort_1(), getMasterName(), getSentinelPassword())
                        .withSentinel(getSentinelHost_2(), getSentinelPort_2())
                        .withSentinel(getSentinelHost_3(), getSentinelPort_3())
                        .withSentinelMasterId(getMasterName()).withPassword(getMasterPassword())
                        .build()

Can you please tell if i am missing something ,or is there a different way of doing it.

Also for RedisURI.Builder.sentinel(host, port).withAuthentication(username, password) I am not able to figure out what is username and password name as specified in its method definition.

[mp911de]

There's a difference between sentinel authentication and data node authentication. I think you need to post-process the RedisURI object after creation. withPassword/withAuthentication configures data node authentication. You can set authentication on the individual sentinels through:

for (RedisURI sentinel : redisURI.getSentinels()) {
    sentinel.setUsername()/sentinel.setPassword();
}

[Pramit2512]

Hello @mp911de (Mark),

With the latest lettuce 6.2.0 even the above approach is deprecated. Can you please suggest any other approach if you have idea.
can we use withAuthentication(String, CharSequence) for sentinel password.

[Pramit2512]

Thansk a lot @mp911de , it worked . Final code looks like this:

    RedisClient redisClient = RedisClient.create();

        LOG.info("created the redis client");

        RedisURI source = RedisURI.Builder
                .sentinel(getSentinelHost_1(), getSentinelPort_1())
                .withSentinel(getSentinelHost_2(), getSentinelPort_2())
                .withSentinel(getSentinelHost_3(), getSentinelPort_3())
                .withSentinelMasterId(getMasterName()).withPassword(getMasterPassword())
                .build();

        for (RedisURI sentinel : source.getSentinels()) {
            sentinel.setPassword(getSentinelPassword());
        }

        StatefulRedisMasterReplicaConnection<String, String> connection = MasterReplica.connect(redisClient, StringCodec.UTF8,
                source);

        connection.setReadFrom(ReadFrom.REPLICA_PREFERRED);

        LOG.info("created the redis connection");