wordpress の設定は完璧にできていたのですが、今日、サーバーがサイトの読み込みを突然停止しました。centos 7 VPS にログインして再起動しました。再起動後、MariaDB は開始されませんでした。ログで見つけたものは次のとおりです。
141026 18:13:50 [Note] /usr/libexec/mysqld: Shutdown complete
141026 18:13:50 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended
141026 18:14:58 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
141026 18:14:58 InnoDB: The InnoDB memory heap is disabled
141026 18:14:58 InnoDB: Mutexes and rw_locks use GCC atomic builtins
141026 18:14:58 InnoDB: Compressed tables use zlib 1.2.7
141026 18:14:58 InnoDB: Using Linux native AIO
141026 18:14:58 InnoDB: Initializing buffer pool, size = 128.0M
141026 18:14:58 InnoDB: Completed initialization of buffer pool
InnoDB: Error: space header page consists of zero bytes in data file ./ibdata1
141026 18:14:58 InnoDB: Could not open or create data files.
141026 18:14:58 InnoDB: If you tried to add new data files, and it failed here,
141026 18:14:58 InnoDB: you should now edit innodb_data_file_path in my.cnf back
141026 18:14:58 InnoDB: to what it was, and remove the new ibdata files InnoDB created
141026 18:14:58 InnoDB: in this failed attempt. InnoDB only wrote those files full of
141026 18:14:58 InnoDB: zeros, but did not yet use them in any way. But be careful: do not
141026 18:14:58 InnoDB: remove old data files which contain your precious data!
141026 18:14:58 [ERROR] Plugin 'InnoDB' init function returned error.
141026 18:14:58 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
141026 18:14:58 [Note] Plugin 'FEEDBACK' is disabled.
141026 18:14:58 [ERROR] Unknown/unsupported storage engine: InnoDB
141026 18:14:58 [ERROR] Aborting
誰かが問題の原因を調査するのを手伝ってくれますか? MariaDB を起動できなくてもデータベースをバックアップできる可能性はありますか?