解决开机自动调用脚本失败的问题

系统版本

# cat /etc/redhat-release
CentOS release 6.5 (Final)

问题情景：云主机上部署的是多实例mysql数据库，希望实现开机数据库服务自启动。系统在启动所有的服务后会执行/etc/rc.d/rc.local 中的命令，如下操作

# cat /etc/rc.d/rc.local 
#!/bin/sh
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

/bin/sh  /tmp/script/tools/st_mysql

#调用的脚本内容
# cat st_mysql 
# 启动mysql服务
ls -l /etc/mysql/|awk '{print $9}'|cut -d'.' -f1|uniq|xargs -i /tmp/mysql/bin/mysqld_multi --defaults-extra-file=/etc/mysql/{}.cnf --no-log start {}

但是重启主机后，发现mysql服务并未启动，在系统启动日志/var/log/boot.log 中也未发现相关信息

解决过程

对脚本增加可执行权限

输出调用脚本的过程到日志文件，如：/bin/sh -x /tmp/script/tools/st_mysql>/tmp/st_mysql.log

然后重新测试发现日志文件中的输出内容为

# vim /etc/rc.d/rc.local 

WARNING: my_print_defaults command not found.
Please make sure you have this command available and
in your path. The command is available from the latest
MySQL distribution.

这是未设置mysql环境变量引发的，系统在执行rc.local文件后才会加载环境变量，所以需要将rc.local的内容改为

# cat /etc/rc.d/rc.local 
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

source /root/.bash_profile

/bin/sh -x /tmp/script/tools/st_mysql>/tmp/st_mysql.log

至此，解决问题