网站建设应该注意的问题,网站标题组合,我要自学网官网免费,免费建立网站的有哪里老男孩教育Linux高端运维班Shell课后必会考试题:企业Shell面试题10#xff1a;开发企业级MySQL启动脚本说明:MySQL启动命令为#xff1a;/bin/sh mysqld_safe --pid-file$mysqld_pid_file_path 21 /dev/null 停止命令逻辑脚本为#xff1a;mysqld_pidcat …老男孩教育Linux高端运维班Shell课后必会考试题:企业Shell面试题10开发企业级MySQL启动脚本说明:MySQL启动命令为/bin/sh mysqld_safe --pid-file$mysqld_pid_file_path 21 /dev/null 停止命令逻辑脚本为mysqld_pidcat $mysqld_pid_file_path
if (kill -0 $mysqld_pid 2/dev/null)thenkill $mysqld_pidsleep 2
fi请完成MySQL启动脚本的编写并实现可以使用chkconfig配置开机自启动。要求用函数case语句、if语句等实现。解答此题的技巧适合绝大多数启动脚本例如rsync,nginx等仅以MySQL为例介绍思路。简单、易用、高效、专业#!/bin/bash
# chkconfig: 2345 64 36
# description: MySQL startup
# Author:oldboy
# Blog:http://oldboy.blog.51cto.com
# Time:2017-07-07 09:24:34
# Name:mysqld
# Version:V1.0
# Description:This is a test script.
[ -f /etc/init.d/functions ] source /etc/init.d/functions
bindir/application/mysql/bin
datadir/application/mysql/data
mysqld_pid_file_path/application/mysql/hostname.pid
PATH/sbin:/usr/sbin:/bin:/usr/bin:$basedir/bin #此步对开机启动及定时启动及其关键。
export PATH
return_value0# Lock directory.
lockdir/var/lock/subsys
lock_file_path$lockdir/mysqllog_success_msg(){ echo SUCCESS! $ # 注意函数的缩进下同也是专业的表现可放到functions里。
}
log_failure_msg(){ echo ERROR! $
} # Start Func
start(){# Start daemonecho Starting MySQLif test -x $bindir/mysqld_safe # 启动文件是否可执行。then$bindir/mysqld_safe --datadir$datadir --pid-file$mysqld_pid_file_path /dev/null return_value$? # 是否处理好返回值是区别脚本是否专业规范的关键。sleep 2# Make lock for CentOSif test -w $lockdir # 锁目录是否可写。thentouch $lock_file_path # 创建锁文件。fiexit $return_valueelselog_failure_msg Couldnt find MySQL server ($bindir/mysqld_safe)fi
}
# Stop Func
stop(){if test -s $mysqld_pid_file_path # 是否PID文件存在并大小大于0。thenmysqld_pidcat $mysqld_pid_file_pathif (kill -0 $mysqld_pid 2/dev/null) # 检查PID对应的进程是否存在。thenecho Shutting down MySQLkill $mysqld_pid # 不能带-9否则后果自负。return_value$?sleep 2elselog_failure_msg MySQL server process #$mysqld_pid is not running!rm -f $mysqld_pid_file_pathfi# Delete lock for Oldboys CentOSif test -f $lock_file_paththenrm -f $lock_file_pathfiexit $return_valueelselog_failure_msg MySQL server PID file could not be found!fi
}
case $1 instart) start;;stop)stop;;restart)if $0 stop; then$0 startelselog_failure_msg Failed to stop running server, so refusing to try to start.exit 1fi;;*)echo Usage: $0 {start|stop|restart}exit 1
esac
exit $return_value #是否处理好返回值是区别脚本是否专业规范的关键。更多Shell知识可参考老男孩的新书《跟老男孩学Linux运维:Shell编程实战》各大书店有售https://item.jd.com/12117874.html 不妨先定个小目标精通Shell编程如果精通了则15K起可联系老男孩给你推荐企业。有精力的朋友可以写下rsync或nginx启动脚本模仿下可以评论在下面。
