From dc0ee2c7064c625a015d2828c4854926f8078fb7 Mon Sep 17 00:00:00 2001
From: Nicolas Battaglini <43277447+Tireur2cables@users.noreply.github.com>
Date: Sun, 9 Aug 2026 14:22:18 +0200
Subject: [PATCH 1/2] Add support for REDIS_HOST_DB environment variable

add support for REDIS_HOST_DB env in the default redis config file

Signed-off-by: Nicolas Battaglini <43277447+Tireur2cables@users.noreply.github.com>
---
 .config/redis.config.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.config/redis.config.php b/.config/redis.config.php
index 2069812f4..116e7f482 100644
--- a/.config/redis.config.php
+++ b/.config/redis.config.php
@@ -18,4 +18,8 @@
   if (getenv('REDIS_HOST_USER') !== false) {
     $CONFIG['redis']['user'] = (string) getenv('REDIS_HOST_USER');
   }
+
+  if (getenv('REDIS_HOST_DB') !== false) {
+    $CONFIG['redis']['dbindex'] = (int) getenv('REDIS_HOST_DB');
+  }
 }

From f123af3b717a7cb4d35f3687c8c09d2a70f06f21 Mon Sep 17 00:00:00 2001
From: Nicolas Battaglini <43277447+Tireur2cables@users.noreply.github.com>
Date: Sun, 9 Aug 2026 14:47:03 +0200
Subject: [PATCH 2/2] Feat: use REDIS_HOST_DB in docker-entrypoint

---
 README.md            | 1 +
 docker-entrypoint.sh | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index eef0ff67c..10a7a8280 100644
--- a/README.md
+++ b/README.md
@@ -289,6 +289,7 @@ To use Redis for memory caching as well as PHP session storage, specify the foll
 - `REDIS_HOST_PORT` (default: `6379`) Optional port for Redis, only use for external Redis servers that run on non-standard ports.
 - `REDIS_HOST_USER` (not set by default) Optional username for Redis, only use for external Redis servers that require a user.
 - `REDIS_HOST_PASSWORD` (not set by default) Redis password
+- `REDIS_HOST_DB` (default: `0`) Index of the Redis database to use, set dbindex parameter in the redis config file for Nextcloud.
 
 Check the [Nextcloud documentation](https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/caching_configuration.html) for more information.
 
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index d8d21c1f6..bec56a705 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -104,10 +104,10 @@ configure_redis_session() {
 
     case "$REDIS_HOST" in
         /*)
-            redis_save_path="unix://${REDIS_HOST}"
+            redis_save_path="unix://${REDIS_HOST}/${REDIS_HOST_DB:=0}"
             ;;
         *)
-            redis_save_path="tcp://${REDIS_HOST}:${REDIS_HOST_PORT:=6379}"
+            redis_save_path="tcp://${REDIS_HOST}:${REDIS_HOST_PORT:=6379}/${REDIS_HOST_DB:=0}"
             ;;
     esac