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操作系统版本： Red Hat Enterprise Linux Server release 5.7 64bit

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数据库版本 ： 5.6.19 MySQL Community Server

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AutoMySQLBackup： Automysqlbackup-v3.0_rc6

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案例场景：

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AutoMySQLBackup 3.0版本备份时，出现告警错误“du: WARNING: use --si, not -H; the meaning of the -H option will soon change to be the same as that of --dereference-args (-D)” 具体信息请见下面：

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==============================================================================

Total disk space used for backup storage...

Size - Location

1.8M /u01/db_backup/mysqlbackup/

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==============================================================================

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###### WARNING ######

Errors reported during AutoMySQLBackup execution.. Backup failed

Error log below..

du: WARNING: use --si, not -H; the meaning of the -H option will soon

change to be the same as that of --dereference-args (-D)

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================================== End of Backup =============================

==============================================================================

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出现这个错误是因为在 Red Hat Enterprise Linux 5.7上的du命令不符合POSIX标准规范。具体参考官方的AutoMySQLBackup 3.0 warning on du in Centos (5.7)

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The POSIX specifications are. It seems, that the Centos 5.7 version of du is not POSIX compliant, but will soon be. I have done my best to use only POSIX compliant syntax to assure the bug-free running on most systems. Unfortunately, I can't take care of every system and distribution, which chooses to defy POSIX syntax. For other people and myself, it would be a good idea to get the options of du on Centos 5.7, so please post 'du --help'.

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如下所示，在命令du --help中，你就能从帮助信息中看到下面信息：

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可以通过修改脚本/usr/local/bin/automysqlbackup 找到下面脚本，修改脚本将“ echo `du -hsH "${CONFIG_backup_dir}"` 修改为 echo `du -hs "${CONFIG_backup_dir}"` 即可解决问题。

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在Red Hat Enterprise Linux Server release 6.6 就不会有这个问题，它的du版本为8.4， Red Hat Enterprise Linux 5.7上的du命令版本为du (GNU coreutils) 5.97

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# du --version

du (GNU coreutils) 8.4

Copyright (C) 2010 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later html>.

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

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Written by Torbj?rn Granlund, David MacKenzie, Paul Eggert,

and Jim Meyering.