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+## YDB
+
+database: https://github.com/ydb-platform/ydb
+
+go driver: https://github.com/ydb-platform/ydb-go-sdk
+
+options:
+
+```
+[ydb]
+enabled=true
+dsn=grpcs://ydb-ru.yandex.net:2135/?database=/ru/home/username/db
+prefix="seaweedfs"
+useBucketPrefix=true
+poolSizeLimit=50
+dialTimeOut = 10
+```
+
+Authenticate produced with one of next environment variables:
+ * `YDB_SERVICE_ACCOUNT_KEY_FILE_CREDENTIALS=<path/to/sa_key_file>` — used service account key file by path
+ * `YDB_ANONYMOUS_CREDENTIALS="1"` — used for authenticate with anonymous access. Anonymous access needs for connect to testing YDB installation
+ * `YDB_METADATA_CREDENTIALS="1"` — used metadata service for authenticate to YDB from yandex cloud virtual machine or from yandex function
+ * `YDB_ACCESS_TOKEN_CREDENTIALS=<access_token>` — used for authenticate to YDB with short-life access token. For example, access token may be IAM token
+ * `YDB_CONNECTION_STRING="grpcs://endpoint/?database=database"`
+
+ * i test using this dev database:
+`make dev_ydb`