{
  "schema_version": 2,
  "id": "operate/rs/release-notes/rs-6-4-2-releases/rs-6-4-2-69",
  "title": "Redis Enterprise Software release notes 6.4.2-69 (May 2023)",
  "url": "https://redis.io/docs/latest/operate/rs/release-notes/rs-6-4-2-releases/rs-6-4-2-69/",
  "summary": "Amazon Linux 2 support. Configure envoy ports using rladmin. Added option to avoid specific nodes when using the optimized shards placement API. Added failure_detection_sensitivity to replace watchdog_profile.",
  "tags": [
    "docs",
    "operate",
    "rs"
  ],
  "last_updated": "2026-10-06T08:53:14-07:00",
  "page_type": "content",
  "content_hash": "68e453b15d3cf301a4d3c6247ec7b2d4901734f9cb9997262c795275a51a7d1d",
  "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 (6.4.2-69 May release) |\n|---------|---------------------------------------|\n| Ubuntu 16 | 31631248672de0154ec20aee0bff9adc |\n| Ubuntu 18 | 7d9ebd4ea5a23137d2bb3928134ea6ef |\n| Ubuntu 20 | 357ceda7467fd66962f3cb5aa143def7 |\n| RedHat Enterprise Linux (RHEL) 7<br/>Oracle Enterprise Linux (OL) 7 | 4d53fcce8c80910a05ed37ab64b57a7a |\n| RedHat Enterprise Linux (RHEL) 8<br/>Oracle Enterprise Linux (OL) 8 <br/>Rocky Enterprise Linux | 88dc6a4d96b948b086f785dc42786d03 |\n| Amazon Linux 2 | 7ed06bc0b35494e4a5c084528d6e8b9f |"
    },
    {
      "id": "new-features-and-enhancements",
      "title": "New features and enhancements",
      "role": "content",
      "text": "- Amazon Linux 2 support\n\n- Enhanced installation logs (RS69079, RS69571, RS77857, RS89760)\n\n- Added support for `rladmin` envoy port configuration (RS95483)\n\n- Support the option to avoid specific nodes when using optimized shards placement API  (RS98795)\n\n- Check port availability before installation and upgrade (RS80815)\n\n- Added `failure_detection_sensitivity` policy to [cluster policy REST API requests](https://redis.io/docs/latest/operate/rs/references/rest-api/requests/cluster/policy). See the [`watchdog_profile` deprecation notice](#watchdog_profile) for more details.\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 v2.4.7](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": "#### watchdog_profile\n\nThe `watchdog_profile` setting is deprecated and will be removed in a future release. Instead, use the `failure_detection_sensitivity` policy for predefined thresholds and timeouts:\n\n[code example]\n\nThe `failure_detection_sensitivity` policy has the following options:\n\n- `high` (previously known as `local-network watchdog_profile`) – high failure detection sensitivity, lower thresholds, and faster failure detection and failover\n\n- `low` (previously known as `cloud watchdog_profile`) – low failure detection sensitivity and higher tolerance for latency variance (also called network jitter)\n\n#### Ubuntu 16.04\n\nUbuntu 16 support is deprecated, and support 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": "- RS97528 - Prevent [self-signed certificate](https://redis.io/docs/latest/operate/rs/security/certificates/create-certificates) script error on Ubuntu 20.04 by changing the user instructions.\n\n- RS99643 - Fix [`cipher_suites`](https://redis.io/docs/latest/operate/rs/security/encryption/tls/ciphers) configuration to allow default cipher suites according to the control plane, data plane, and discovery service.\n\n- RS99696 - Fix  [`HINCRBYFLOT`](https://github.com/redis/redis/security/advisories/GHSA-hjv8-vjf6-wcr6) CVE\n\n- RS54226 - During upgrades, a CRDB worker process would intermittently get stuck in a restart loop. This issue is now fixed."
    },
    {
      "id": "known-limitations",
      "title": "Known limitations",
      "role": "content",
      "text": ""
    },
    {
      "id": "feature-limitations",
      "title": "Feature limitations",
      "role": "content",
      "text": "- RS78430 -  When [tuning module arguments](https://redis.io/docs/latest/operate/rs/references/cli-utilities/rladmin/tune#tune-db), any typo or use of unsupported arguments can cause shards to get stuck after restart."
    },
    {
      "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."
    }
  ],
  "examples": [
    {
      "id": "deprecations-ex0",
      "language": "sh",
      "code": "rladmin tune cluster failure_detection_sensitivity [ high | low ]",
      "section_id": "deprecations"
    },
    {
      "id": "deprecations-ex1",
      "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"
    }
  ]
}