Docker compose:mysqld:无法创建/写入文件“/var/lib/mysql/is_writeable”(错误代码:13-权限被拒绝)

 version: '3'
 services:

 # Mysql DB
    db:
        image: percona:5.7
        #build: ./docker/mysql
        volumes:
          - "./db/data:/var/lib/mysql"
          - "./db/init:/docker-entrypoint-initdb.d"
          - "./db/backups:/tmp/backups"
          - "./shared/home:/home"   
          - "./shared/root:/home"  
        restart: unless-stopped
        environment:
            MYSQL_ROOT_PASSWORD: root
            MYSQL_DATABASE: db_name
            MYSQL_USER: user
            MYSQL_PASSWORD: pass
       ports:
       - "3307:3306"

我什么都试过了,但运气不好:

"./db/data:/var/lib/mysql:rw"

创建dockerfile并从生成而不是图像创建:

FROM percona:5.7

RUN adduser mysql
RUN sudo chown mysql /var/lib/mysql
RUN sudo chgrp mysql /var/lib/mysql

我还尝试在db服务上添加用户:

user: "1000:50"

但任何这些都可以解决这个问题。。我错过了什么?

MySQL 5.7 installation error `mysqld: Can't create/write to file '/var/lib/mysql/is_writable'`