docker Loss data

[leipore]

docker run -d --name mysql -v /etc/mysql:/etc/mysql/conf.d -v /app/mysqldata:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=xxxxx -p3306:3306 -d mysql:5.6.51

about 10 days later, I start docker mysql,then /app/mysqldata/ is empty. It is terrible!!! give me advices. thinks.

Client:
Version: 28.1.1
API version: 1.48
Go version: go1.23.8
Git commit: 068a01e
Built: Mon Apr 28 08:56:57 2025
OS/Arch: linux/amd64
Context: default

Server:
Engine:
Version: 28.1.1
API version: 1.49 (minimum version 1.24)
Go version: go1.23.8
Git commit: 01f442b
Built: Mon Apr 28 08:57:33 2025
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.7.27
GitCommit: 05044ec0a9a75232cad458027ca83437aae3f4da
runc:
Version: 1.2.6
GitCommit:
docker-init:
Version: 0.19.0
GitCommit: de40ad0

[leipore]