在docker中使用xtrabackup容器备份mysql时出现文件权限错误

Question

我的网络应用程序是通过

docker compose

部署的。为了备份数据，我添加了一个 xtrabackup 容器，如下所示：

  mysql_backup:
    image: perconalab/percona-xtrabackup:8.4.0-1
    container_name: mysql_backup
    volumes:
      - './mysql/db:/var/lib/mysql'
      - './backup:/tmp/backup'
    depends_on:
      - ferry_mysql

  ferry_mysql:
    image: mysql:8
    container_name: ferry_mysql
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: 'xxx'
      MYSQL_DATABASE: 'app'
      MYSQL_USER: 'app'
      MYSQL_PASSWORD: 'xxx'
    volumes:
      - './mysql/db:/var/lib/mysql'

然后我用容器打开 bash 并开始使用以下命令进行备份：

docker compose run mysql_backup bash
xtrabackup --backup --host=ferry_mysql --target-dir=/tmp/backup/data --data-dir=/var/lib/mysql --user=root --password=xxx

然后我收到以下错误

2024-11-05T07:25:23.460993-00:00 0 [ERROR] [MY-012592] [InnoDB] Operating system error number 13 in a file operation.
2024-11-05T07:25:23.461034-00:00 0 [ERROR] [MY-012595] [InnoDB] The error means mysqld does not have the access rights to the directory.
2024-11-05T07:25:23.461043-00:00 0 [ERROR] [MY-013861] [InnoDB] Failed to list redo log files in the redo log directory ./#innodb_redo/

Answer 1

原来是用户权限问题。

/var/lib/mysql

中的文件归用户

999

所有，

id $(whami)

显示当前用户是

mysql(1001)

。

为了解决此问题，我将

-u

选项添加到

docker run

以以用户 999 身份运行 bash：

docker compose run -u 999 mysql_backup bash