diff --git a/Environment-Variables.md b/Environment-Variables.md
index 49e4672..d976fbf 100644
--- a/Environment-Variables.md
+++ b/Environment-Variables.md
@@ -13,6 +13,26 @@ weed master
 # Weed prefix
 For `v`, `logtostderr`, `stderrthreshold`, `vmoudle`, `options`, `logdir`, `alsologtostderr`, `log_backtrace_at` , and `config_dir` you have to use `WEED_` as prefix for environment variable like this `WEED_CONFIG_DIR=/tmp`
 
+## Configuration File Settings
+For configuration file settings (like filer stores, replication settings, etc.), you must use the `WEED_` prefix with dots (`.`) replaced by underscores (`_`).
+
+For example, the `filer.toml` configuration:
+```toml
+[redis2]
+enabled = true
+address = "localhost:6379"
+password = "secret"
+database = 0
+```
+
+Becomes these environment variables:
+```shell
+WEED_REDIS2_ENABLED=true
+WEED_REDIS2_ADDRESS=localhost:6379
+WEED_REDIS2_PASSWORD=secret
+WEED_REDIS2_DATABASE=0
+```
+
 # S3 Admin Credentials
 For S3 API server authentication, see the dedicated **[S3 Credentials](S3-Credentials)** page which covers:
 - Configuration file setup (highest priority)
@@ -69,3 +89,181 @@ services:
     depends_on:
       - filer
 ```
+
+# Filer Metadata Store Configuration
+
+The filer supports multiple metadata storage backends. You can configure them using environment variables instead of a `filer.toml` file.
+
+## Redis Configuration
+
+### Basic Redis (`redis2`)
+```yaml
+version: '3.9'
+services:
+  redis:
+    image: redis:7-alpine
+    ports:
+      - 6379:6379
+    command: redis-server --requirepass your_password
+
+  master:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 9333:9333
+    command: master
+
+  volume:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 8080:8080
+    command: volume -mserver=master:9333
+    depends_on:
+      - master
+
+  filer:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 8888:8888
+    environment:
+      # Enable Redis as metadata store
+      - WEED_REDIS2_ENABLED=true
+      - WEED_REDIS2_ADDRESS=redis:6379
+      - WEED_REDIS2_PASSWORD=your_password
+      - WEED_REDIS2_DATABASE=0
+      # Optional: TLS configuration
+      - WEED_REDIS2_ENABLE_TLS=false
+      # Disable default leveldb2
+      - WEED_LEVELDB2_ENABLED=false
+    command: filer -master=master:9333
+    depends_on:
+      - master
+      - volume
+      - redis
+```
+
+### Redis Sentinel
+```shell
+WEED_REDIS2_SENTINEL_ENABLED=true
+WEED_REDIS2_SENTINEL_ADDRESSES=sentinel1:26379,sentinel2:26379,sentinel3:26379
+WEED_REDIS2_SENTINEL_MASTERNAME=mymaster
+WEED_REDIS2_SENTINEL_USERNAME=
+WEED_REDIS2_SENTINEL_PASSWORD=secret
+WEED_REDIS2_SENTINEL_DATABASE=0
+WEED_LEVELDB2_ENABLED=false
+```
+
+### Redis Cluster
+```shell
+WEED_REDIS_CLUSTER2_ENABLED=true
+WEED_REDIS_CLUSTER2_ADDRESSES=redis1:6379,redis2:6379,redis3:6379
+WEED_REDIS_CLUSTER2_PASSWORD=secret
+WEED_REDIS_CLUSTER2_READONLY=false
+WEED_REDIS_CLUSTER2_ROUTEBYLATENCY=false
+WEED_LEVELDB2_ENABLED=false
+```
+
+## MySQL/MariaDB Configuration
+```yaml
+version: '3.9'
+services:
+  mysql:
+    image: mysql:8
+    ports:
+      - 3306:3306
+    environment:
+      - MYSQL_ROOT_PASSWORD=secret
+      - MYSQL_DATABASE=seaweedfs
+      - MYSQL_USER=seaweedfs
+      - MYSQL_PASSWORD=secret
+
+  master:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 9333:9333
+    command: master
+
+  volume:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 8080:8080
+    command: volume -mserver=master:9333
+    depends_on:
+      - master
+
+  filer:
+    image: chrislusf/seaweedfs:latest
+    ports:
+      - 8888:8888
+    environment:
+      # MySQL configuration
+      - WEED_MYSQL_ENABLED=true
+      - WEED_MYSQL_HOSTNAME=mysql
+      - WEED_MYSQL_PORT=3306
+      - WEED_MYSQL_DATABASE=seaweedfs
+      - WEED_MYSQL_USERNAME=seaweedfs
+      - WEED_MYSQL_PASSWORD=secret
+      - WEED_MYSQL_CONNECTION_MAX_IDLE=5
+      - WEED_MYSQL_CONNECTION_MAX_OPEN=75
+      - WEED_MYSQL_CONNECTION_MAX_LIFETIME_SECONDS=600
+      - WEED_MYSQL_INTERPOLATEPARAMS=true
+      # Disable default leveldb2
+      - WEED_LEVELDB2_ENABLED=false
+    command: filer -master=master:9333
+    depends_on:
+      - master
+      - volume
+      - mysql
+```
+
+## PostgreSQL Configuration
+```shell
+WEED_POSTGRES_ENABLED=true
+WEED_POSTGRES_HOSTNAME=postgres
+WEED_POSTGRES_PORT=5432
+WEED_POSTGRES_DATABASE=seaweedfs
+WEED_POSTGRES_USERNAME=seaweedfs
+WEED_POSTGRES_PASSWORD=secret
+WEED_POSTGRES_SSLMODE=disable
+WEED_POSTGRES_CONNECTION_MAX_IDLE=5
+WEED_POSTGRES_CONNECTION_MAX_OPEN=75
+WEED_POSTGRES_CONNECTION_MAX_LIFETIME_SECONDS=600
+WEED_LEVELDB2_ENABLED=false
+```
+
+## MongoDB Configuration
+```shell
+WEED_MONGODB_ENABLED=true
+WEED_MONGODB_URI=mongodb://mongodb:27017
+WEED_MONGODB_DATABASE=seaweedfs
+WEED_MONGODB_USERNAME=seaweedfs
+WEED_MONGODB_PASSWORD=secret
+WEED_LEVELDB2_ENABLED=false
+```
+
+## Etcd Configuration
+```shell
+WEED_ETCD_ENABLED=true
+WEED_ETCD_SERVERS=etcd1:2379,etcd2:2379,etcd3:2379
+WEED_ETCD_KEY_PREFIX=seaweedfs.
+WEED_ETCD_TIMEOUT=3s
+WEED_LEVELDB2_ENABLED=false
+```
+
+## Important Notes
+
+1. **Only one store can be enabled**: Make sure to disable the default `leveldb2` store when using an external metadata store:
+   ```shell
+   WEED_LEVELDB2_ENABLED=false
+   ```
+
+2. **Available stores**: To see all available filer stores and their configuration options, run:
+   ```shell
+   weed scaffold -config=filer
+   ```
+
+3. **Data migration**: Changing stores doesn't automatically migrate existing data. Apply these configurations to new installations or migrate data manually.
+
+4. **Array values**: For configuration options that accept arrays (like Redis cluster addresses), use comma-separated values:
+   ```shell
+   WEED_REDIS_CLUSTER2_ADDRESSES=host1:6379,host2:6379,host3:6379
+   ```