{
  "schema_version": 2,
  "id": "operate/rs/release-notes/rs-6-4-2-releases/rs-6-4-2-61",
  "title": "Redis Enterprise Software release notes 6.4.2-61 (April 2023)",
  "url": "https://redis.io/docs/latest/operate/rs/release-notes/rs-6-4-2-releases/rs-6-4-2-61/",
  "summary": "Amazon Linux 2 support. Fixed known limitations for custom installation on RHEL 7 and RHEL 8, running rl_rdbconvert manually, and resharding rack-aware databases with no replication.",
  "tags": [
    "docs",
    "operate",
    "rs"
  ],
  "last_updated": "2026-10-06T08:53:14-07:00",
  "page_type": "content",
  "content_hash": "0c5c0122cf47489ba1aa39086e1042870718e9875c8ae2535f954ea787fadb18",
  "sections": [
    {
      "id": "overview",
      "title": "Overview",
      "role": "overview",
      "text": "This is a maintenance release for ​[​Redis Enterprise Software version 6.4.2](https://redis.io/downloads/#software).\n\nThe following table shows the MD5 checksums for the available packages:\n\n| Package | MD5 checksum (6.4.2-61 April release) |\n|---------|---------------------------------------|\n| Ubuntu 16 | f8f616147c9daaaeb9cd8cb1ae44157f |\n| Ubuntu 18 | 1de5b0bafd4edec8d7817bddcecf3824 |\n| Ubuntu 20 | 829e91c7fac1a0ab7e36cb4a65d19906 |\n| RedHat Enterprise Linux (RHEL) 7<br/>Oracle Enterprise Linux (OL) 7 | 477f1d3161ea16e8d52c41eb61d92637 |\n| RedHat Enterprise Linux (RHEL) 8<br/>Oracle Enterprise Linux (OL) 8 <br/>Rocky Enterprise Linux | 1170af43f88bf5f9095890916c0fe74d |\n| Amazon Linux 2 (Release Candidate) | e246ae158db32e0a483a23392b2a7f47 |"
    },
    {
      "id": "new-features-and-enhancements",
      "title": "New features and enhancements",
      "role": "content",
      "text": "- Amazon Linux 2 supported as a release candidate (RC)\n\n    > [!NOTE]\n    > A database with modules cannot reside on an Amazon Linux 2 (release candidate) node. Support will be added in a future maintenance release.\n\n- Add node ID indication to [`debug_info` package](https://redis.io/docs/latest/operate/rs/references/cli-utilities/rladmin/cluster/debug_info) (RS95360)\n\n- Add support for underscore `_` as a valid character for [rack awareness](https://redis.io/docs/latest/operate/rs/clusters/configure/rack-zone-awareness) (RS87458)\n\n- When updating a [BDB object](https://redis.io/docs/latest/operate/rs/references/rest-api/objects/bdb), the version property is immutable. Any validation will be performed according to the BDB object version that was set during upgrade or install (RS93294)\n\n#### Redis Stack v6.2.6\n\nRedis Enterprise Software v6.4.2 includes the new features delivered in the latest [Redis Stack release (6.2.6 v6)](https://redis.com/blog/introducing-redis-stack-6-2-6-and-7-0-6/):\n\n- [RediSearch v2.6.6](https://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/search)\n\n- [RedisJSON v2.4.6](https://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/json)\n\n- [RedisBloom v2.4.5](https://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/bloom)\n\n- [RedisGraph v2.10.9](https://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/deprecated-features/graph)\n\n- [RedisTimeSeries v1.8.9](https://redis.io/docs/latest/operate/oss_and_stack/stack-with-enterprise/timeseries)\n\nSee [Upgrade modules](https://redis.io/docs/latest/operate/rs/installing-upgrading/modules/upgrade-module) to learn how to upgrade a module for a database."
    },
    {
      "id": "version-changes",
      "title": "Version changes",
      "role": "compatibility",
      "text": ""
    },
    {
      "id": "deprecations",
      "title": "Deprecations",
      "role": "content",
      "text": "#### Ubuntu 16.04\n\nUbuntu 16 support is deprecated and will be removed in a future release.\n\n#### Active-Active database persistence\n\nThe RDB snapshot option for [Active-Active database persistence](https://redis.io/docs/latest/operate/rs/databases/active-active/manage#data-persistence) is deprecated and will be removed in a future release.\n\nPlease plan to reconfigure any Active-Active databases to use append-only file (AOF) persistence with the following command:\n\n[code example]"
    },
    {
      "id": "resolved-issues",
      "title": "Resolved issues",
      "role": "content",
      "text": "- RS95344 - Fixed known limitation for RHEL 7 and RHEL 8 where CRDB databases fail to start when installed using custom installation paths\n\n- RS88010 - Roll back node configuration when the [remove node](https://redis.io/docs/latest/operate/rs/clusters/remove-node) operation fails\n\n- RS95824 - Fixed an issue with running `rl_rdbconvert` on Ubuntu\n\n- RS97971 - Fixed known limitation for the edge case where resharding fails for rack-aware databases with no replication"
    },
    {
      "id": "known-limitations",
      "title": "Known limitations",
      "role": "content",
      "text": ""
    },
    {
      "id": "operating-system-limitations",
      "title": "Operating system limitations",
      "role": "content",
      "text": "#### Ubuntu 20.04\n\nBy default, you cannot use the SHA1 hash algorithm ([OpenSSL’s default security level is set to 2](https://manpages.ubuntu.com/manpages/focal/man3/SSL_CTX_set_security_level.3ssl.html#notes)). The operating system will reject SHA1 certificates even if the `mtls_allow_weak_hashing` option is enabled. You need to replace SHA1 certificates with newer certificates that use SHA-256. Note that the certificates provided with Redis Enterprise Software use SHA-256.\n\n#### Modules not supported for Amazon Linux 2 release candidate\n\nA database with modules cannot reside on an Amazon Linux 2 (release candidate) node. Support will be added in a future maintenance release."
    }
  ],
  "examples": [
    {
      "id": "deprecations-ex0",
      "language": "sh",
      "code": "crdb-cli crdb update --crdb-guid <CRDB_GUID> \\\n    --default-db-config '{\"data_persistence\": \"aof\", \"aof_policy\":\"appendfsync-every-sec\"}'",
      "section_id": "deprecations"
    }
  ]
}