The guide for using external database is for host deployment, but how to use a external database when using docker image ? I try to stop onedev in an container and get below output

root@985ee171dda2:/opt/onedev#  /opt/onedev/bin/server.sh stop
Removed stale pid file: /opt/onedev/bin/../status/onedev.pid
OneDev is not running.

But it seems the onedev is still running.

root@985ee171dda2:/opt/onedev# ps -ef
UID          PID    PPID  C STIME TTY          TIME CMD
root           1       0  0 12:37 ?        00:00:00 /bin/bash /root/bin/entrypoint.sh
root          76       1  0 12:38 ?        00:00:00 /opt/onedev/boot/wrapper-linux-x86-64 /opt/onedev/conf/wrapper.conf
root          88      76 39 12:38 ?        00:00:23 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -Djava.awt.headless=true -XX:+IgnoreUnrecognizedVMOptions --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.reflect=ALL-UNNAMEroot          98       0  0 12:38 pts/0    00:00:00 /bin/bash
root         415      98  0 12:39 pts/0    00:00:00 ps -ef

And I try to backup database, but an error occureed.

root@985ee171dda2:/opt/onedev# /opt/onedev/bin/backup-db.sh db.b
Running OneDev Backup Database...
--> Wrapper Started as Console
Java Service Wrapper Standard Edition 64-bit 3.5.44
  Copyright (C) 1999-2020 Tanuki Software, Ltd. All Rights Reserved.
    http://wrapper.tanukisoftware.com
  Licensed to OneDev for Service Wrapping

Launching a JVM...
WrapperManager: Initializing...
INFO  - Launching application from '/opt/onedev'...
INFO  - Cleaning temp directory...
INFO  - Initializing dependency injection container...
INFO  - Starting plugin manager...
ERROR - Error booting application
java.lang.RuntimeException: java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@9c516f56[file =/opt/onedev/sampledb/onedev.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2021-05-27 12:39:29 heartbeat - read: -9860 ms.
        at io.onedev.commons.utils.ExceptionUtils.unchecked(ExceptionUtils.java:36) ~[io.onedev.commons-utils-2.0.8.jar:na]
        at io.onedev.server.persistence.DefaultPersistManager.getConnection(DefaultPersistManager.java:226) ~[io.onedev.server-core-4.4.0.jar:na]
        at io.onedev.server.persistence.DefaultPersistManager.readDbDataVersion(DefaultPersistManager.java:247) ~[io.onedev.server-core-4.4.0.jar:na]
        at io.onedev.server.persistence.DefaultPersistManager.checkDataVersion(DefaultPersistManager.java:142) ~[io.onedev.server-core-4.4.0.jar:na]
        at io.onedev.server.maintenance.BackupDatabase.start(BackupDatabase.java:60) ~[io.onedev.server-core-4.4.0.jar:na]
        at io.onedev.server.OneDev.start(OneDev.java:111) ~[io.onedev.server-core-4.4.0.jar:na]
        at io.onedev.commons.launcher.loader.DefaultPluginManager.start(DefaultPluginManager.java:44) ~[io.onedev.commons-launcher-loader-2.0.8.jar:na]
        at io.onedev.commons.launcher.loader.AppLoader.start(AppLoader.java:74) ~[io.onedev.commons-launcher-loader-2.0.8.jar:na]
        at io.onedev.commons.launcher.bootstrap.Bootstrap.main(Bootstrap.java:174) ~[io.onedev.commons-launcher-bootstrap-2.0.8.jar:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_292]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_292]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_292]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_292]
        at org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:349) [wrapper.jar:3.5.44]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_292]
Caused by: java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@9c516f56[file =/opt/onedev/sampledb/onedev.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2021-05-27 12:39:29 heartbeat - read: -9860 ms.
        at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.jdbc.JDBCConnection.<init>(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.jdbc.JDBCDriver.connect(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at io.onedev.server.persistence.DefaultPersistManager.getConnection(DefaultPersistManager.java:224) ~[io.onedev.server-core-4.4.0.jar:na]
        ... 13 common frames omitted
Caused by: org.hsqldb.HsqlException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@9c516f56[file =/opt/onedev/sampledb/onedev.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2021-05-27 12:39:29 heartbeat - read: -9860 ms.
        at org.hsqldb.error.Error.error(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.error.Error.error(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.persist.LockFile.newLockFileLock(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.persist.Logger.acquireLock(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.persist.Logger.open(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.Database.reopen(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.Database.open(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.DatabaseManager.getDatabase(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        at org.hsqldb.DatabaseManager.newSession(Unknown Source) ~[org.hsqldb.hsqldb-2.4.0.jar:2.4.0]
        ... 17 common frames omitted
<-- Wrapper Stopped

So could you give me a hand?