Enterprise Shell face question 10: Developing an enterprise MySQL startup script
Description
The MySQL startup command is:
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/bin/shmysqld_safe --pid-file=$mysqld_pid_file_path 2>&1 >/dev/null& |
The Stop command logic script is:
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< Code class= "Bash Plain" >mysqld_pid= ' cat "$mysqld _pid_file_path" if ( kill -0 $mysqld _pid 2> /dev/null &NBSP;&NBSP; then &NBSP;&NBSP;&NBSP;&NBSP; kill $mysqld _pid &NBSP;&NBSP;&NBSP;&NBSP; sleep 2 fi |
Please complete the MySQL startup script and implement the Chkconfig configuration to boot from.
Requirements: Implemented with functions, case statements, if statements, and so on.
Answer: The technique of this problem is suitable for most startup scripts, for example: Rsync,nginx and so on, only take MySQL as an example to introduce ideas.
Simple, easy-to-use, efficient, professional
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#!/bin/bash# chkconfig: 2345 64 36# description: MySQL startup#Author:oldboy#Blog:http://oldboy.blog.51cto.com#Time:2017-07-07 09:24:34#Name:mysqld#Version:V1.0#Description:This is a test script.[ -f /etc/init.d/functions] && source/etc/init.d/functionsbindir="/application/mysql/bin"datadir="/application/mysql/data"mysqld_pid_file_path="/application/mysql/`hostname`.pid"PATH="/sbin:/usr/sbin:/bin:/usr/bin:$basedir/bin"#此步对开机启动及定时启动及其关键。exportPATHreturn_value=0# Lock directory.lockdir=‘/var/lock/subsys‘lock_file_path="$lockdir/mysql"log_success_msg(){ echo" SUCCESS! [email protected]"# 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! [email protected]"} # Start Funcstart(){ # Start daemon echo"Starting MySQL" iftest-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。 sleep2 # Make lock for CentOS iftest-w "$lockdir"# 锁目录是否可写。 then touch"$lock_file_path"# 创建锁文件。 fi exit$return_value else log_failure_msg "Couldn‘t find MySQL server ($bindir/mysqld_safe)" fi}# Stop Funcstop(){ iftest-s "$mysqld_pid_file_path"# 是否PID文件存在并大小大于0。 then mysqld_pid=`cat"$mysqld_pid_file_path"` if(kill-0 $mysqld_pid 2>/dev/null) # 检查PID对应的进程是否存在。 then echo"Shutting down MySQL" kill$mysqld_pid # 不能带-9，否则后果自负。 return_value=$? sleep2 else log_failure_msg "MySQL server process #$mysqld_pid is not running!" rm-f "$mysqld_pid_file_path" fi # Delete lock for Oldboy‘s CentOS iftest-f "$lock_file_path" then rm-f "$lock_file_path" fi exit$return_value else log_failure_msg "MySQL server PID file could not be found!" fi}case"$1"in start) start ;; stop) stop ;; restart) if$0 stop; then $0 start else log_failure_msg "Failed to stop running server, so refusing to try to start." exit1 fi ;; *) echo"Usage: $0 {start|stop|restart}" exit1esacexit$return_value #是否处理好返回值是区别脚本是否专业规范的关键。 |
Retained original source: http://oldboy.blog.51cto.com/2561410/1945183
Thanks to the author for sharing,
Linux shell attempts to write enterprise-level startup scripts
