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innobackupex /backup --rsync --user=xx --password=xxx 备份时报错：

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Error: can't create file (null)/xtrabackup_rsyncfiles_pass1

网上搜索没有找到答案，于是向官方报告 bug ，发现已经有人汇报了该bug：

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https://bugs.launchpad.net/percona-xtrabackup/+bug/1511701

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Bug Description

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After latest update xtrabackup to 2.3.2 my backup scripts stop working.

Problem in "--rsync" argument. With it in half of "copying X to Y" xtrabackup exit with error message:

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can't create file (null)/xtrabackup rsync files pass1

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With previous builds all was fine.

Problem command line:

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innobackupex --defaults-file=/etc/ mysql/my.cnf --user=root --password=`cat /root/passwords/.mysql` --no-timestamp --throttle=40 --rsync /var/backups/separate_disk/mysql/${WEEK_DAY_NUMBER}f 2>&1

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If remove "--rsync" - all work without errors.

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P.S. and previous versions uses "root" as default user name. Now it use "mysql" if in command line didn't defined "--user". (Back incompatibility)

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Sergei Glushchenko (sergei.glushchenko) wrote on 2015-10-30: ? ? #1

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Would specifying --tmpdir=/tmp (or other directory) resolve the rsync issue?

Maxim (sailormax) wrote on 2015-11-01: ? ? #2

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yes.

Sergei Glushchenko (sergei.glushchenko) wrote on 2015-11-09: ? ? #3

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We'll set tmpdir to system/user default when it is not specified.

Changed in percona-xtrabackup:

status: ? ? New → Triaged

importance: ? ? Undecided → High?

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解决办法：

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在使用 --rsync 选项时，需要增加 --tmpdir=/tmp 选择，来指定 xtrabackup_rsyncfiles_pass1 临时文件的存储位置：

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innobackupex /backup/ --rsync --tmpdir=/tmp --user=xxx --password=xxx