centos crond执行shell无反应

[johopig]

首先restart_mysql.sh文件如下

# !/bin/sh
pidof mysqld >/dev/null
if [ $? -eq 0 ]
then
echo "running...">> ./mysql_log.txt
else
echo " mysql server was stopped">> ./mysql_log.txt
service mysql start
fi

crontab -e 进入编辑如下

*/2 * * * * /var/spool/cron/restart_mysql.sh

接着

service crond restart

两分钟后去看 mysql_log.txt 是空的,
但是直接在该目录下 ./restart_mysql.sh之后去查看mysql_log.txt，能看到增加了一条信息。。。

[johopig]

crond 配置如下

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root

# For details see man 4 crontabs

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name  command to be executed

[johopig]

1使用绝对路径 2. shell脚本第一行直接 cd到所操作的目录