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🔧 feat: Alternative DNS Lookup for AWS ElastiCache TLS Connections (#9264)

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* added REDIS_USE_ALTERNATIVE_DNS_LOOKUP env variable to modify redis connection by adding dnsLookup
this is required when connecting to elasticache for ioredis
see "Special Note: Aws Elasticache Clusters with TLS" on this webpage:  https://www.npmjs.com/package/ioredis

* added REDIS_USE_ALTERNATIVE_DNS_LOOKUP env variable to modify redis connection by adding dnsLookup
this is required when connecting to elasticache for ioredis
see "Special Note: Aws Elasticache Clusters with TLS" on this webpage:  https://www.npmjs.com/package/ioredis

---------

Co-authored-by: Marc Amick <MarcAmick@jhu.edu>
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MarcAmick 2025-08-27 16:09:07 -04:00 • committed by GitHub
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commit ea3b671182
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4
.env.example
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@ -660,6 +660,10 @@ HELP_AND_FAQ_URL=https://librechat.ai
# REDIS_URI=rediss://127.0.0.1:6380
# REDIS_CA=/path/to/ca-cert.pem
# Elasticache may need to use an alternate dnsLookup for TLS connections. see "Special Note: Aws Elasticache Clusters with TLS" on this webpage: https://www.npmjs.com/package/ioredis
# Enable alternative dnsLookup for redis
# REDIS_USE_ALTERNATIVE_DNS_LOOKUP=true
# Redis authentication (if required)
# REDIS_USERNAME=your_redis_username
# REDIS_PASSWORD=your_redis_password

3
api/cache/cacheConfig.js vendored
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@ -52,6 +52,9 @@ const cacheConfig = {
REDIS_CONNECT_TIMEOUT: math(process.env.REDIS_CONNECT_TIMEOUT, 10000),
/** Queue commands when disconnected */
REDIS_ENABLE_OFFLINE_QUEUE: isEnabled(process.env.REDIS_ENABLE_OFFLINE_QUEUE ?? 'true'),
/** flag to modify redis connection by adding dnsLookup this is required when connecting to elasticache for ioredis
* see "Special Note: Aws Elasticache Clusters with TLS" on this webpage: https://www.npmjs.com/package/ioredis **/
REDIS_USE_ALTERNATIVE_DNS_LOOKUP: isEnabled(process.env.REDIS_USE_ALTERNATIVE_DNS_LOOKUP),
/** Enable redis cluster without the need of multiple URIs */
USE_REDIS_CLUSTER: isEnabled(process.env.USE_REDIS_CLUSTER ?? 'false'),
CI: isEnabled(process.env.CI),

3
api/cache/redisClients.js vendored
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@ -53,6 +53,9 @@ if (cacheConfig.USE_REDIS) {
: new IoRedis.Cluster(
urls.map((url) => ({ host: url.hostname, port: parseInt(url.port, 10) || 6379 })),
{
...(cacheConfig.REDIS_USE_ALTERNATIVE_DNS_LOOKUP
? { dnsLookup: (address, callback) => callback(null, address) }
: {}),
redisOptions,
clusterRetryStrategy: (times) => {
if (