---
title: "Deep Dive into SASL PLAIN and SCRAM in Kafka: Login Modules and Config Hot-Reload"
url: https://daily.dev/posts/deep-dive-into-sasl-plain-and-scram-in-kafka-login-modules-and-config-hot-reload-fqd7zqpbm
source_url: https://www.confluent.io/blog/kafka-authentication-sasl-plain-scram-config-hot-reload
type: article
source: "Confluent Blog"
published: 2026-07-06T09:47:52.077Z
updated: 2026-07-06T09:48:18.499Z
tags: ["security", "authentication", "apache-kafka", "confluent-cloud"]
reading_time: 7
upvotes: 0
comments: 0
language: en
---

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# Deep Dive into SASL PLAIN and SCRAM in Kafka: Login Modules and Config Hot-Reload

**[Confluent Blog](https://daily.dev/sources/conf)** · 7 min read · 0 upvotes · 0 comments

## Summary

A deep dive into Kafka SASL authentication mechanisms — PLAIN and SCRAM — focusing on how different login modules (PlainLoginModule, ScramLoginModule, FileBasedLoginModule) handle credential storage and whether they support hot-reload without broker restarts. SCRAM stores credentials in cluster metadata (KRaft), enabling native hot-reload via Admin APIs. Static JAAS PLAIN requires broker restarts for credential changes, while file-backed PLAIN modules support hot-reload through periodic file watching. The post includes a concrete three-listener broker configuration example, scenario-based comparisons of each mechanism's behavior during credential updates, and production recommendations for zero-downtime credential rotation.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://www.confluent.io/blog/kafka-authentication-sasl-plain-scram-config-hot-reload>

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Tags: [#security](https://daily.dev/tags/security), [#authentication](https://daily.dev/tags/authentication), [#apache-kafka](https://daily.dev/tags/apache-kafka), [#confluent-cloud](https://daily.dev/tags/confluent-cloud)

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