☰

cron 不执行

tag-icon • tag-icon linux cron
cron 不执行

我的 crontab 中有一个 cron

45 18 * * * root /bkp_db.sh

但它不起作用。它没有被执行。我做错了什么？

在我的脚本中：

NOW=$(date +"%Y-%m-%d")
mysqldump -u root apps_db > bkp_apps/dump_app1_$NOW.sql
mysqldump -u root app_db2 > bkp_apps/dump_app2_$NOW.sql
zip -r bkp_apps/bkp_apps_$NOW.zip /var/www/myapps/public_html

答案1

您的个人 crontab 文件应该如下所示

45 18 * * * /bkp_db.sh

有多个 crontab 文件，每个文件的布局略有不同。通过编辑的个人 crontab 文件crontab -e不包含用户名。

man crontab说，

There    is    one    file    for    each   user's   crontab   under   the
/var/spool/cron/crontabs directory. Users are  not  allowed  to  edit  the
files  under  that directory directly to ensure that only users allowed by
the system to run periodic tasks can add them, and only syntactically cor‐
rect  crontabs  will  be  written  there.   This is enforced by having the
directory writable only by the crontab group and configuring crontab  com‐
mand with the setgid bid set for that specific group.

但如果你读了，man cron你也会读到，

Additionally,  in  Debian,  cron reads the files in the /etc/cron.d direc‐
tory.  cron treats the files in /etc/cron.d as in  the  same  way  as  the
/etc/crontab  file (they follow the special format of that file, i.e. they
include the user field). However, they are  independent  of  /etc/crontab:
they  do  not, for example, inherit environment variable settings from it.
This change is specific to Debian  see  the  note  under  DEBIAN  SPECIFIC
below.

相关内容