Developing Enterprise standard service startup script case (MySQL) through shell

Old Boys educate Linux high-end Viban shell after class will be exam questions:

Enterprise Shell face question 10: Developing an enterprise MySQL startup script

Description

The MySQL startup command is:

/bin/sh mysqld_safe--pid-file= $mysqld _pid_file_path 2>&1 >/dev/null &

The Stop command logic script is:

Mysqld_pid= ' cat ' $mysqld _pid_file_path "' if (kill-0 $mysqld _pid 2>/dev/null) then kill $mysqld _pid Sleep 2fi

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

#!/bin/bash# chkconfig: 2345 64 36# description: mysql startup#author:o Ldboy#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: $basedir/bin "  #此步对开机启动及定时启动及其关键. Export pathreturn_value=0# lock directory.lockdir= '/var/lock/subsys ' lock_file_path= "$lockdir/ MySQL "log_success_msg () {     echo "  success! [email protected] "  #  note the indentation of functions, the same below, but also professional performance, can be put into the functions. }   log_failure_msg () {         echo  "  Error! [email protected] "}  # start funcstart () {    # Start daemon    echo  "Starting mysql"      if test -x  $bindir/mysqld_safe  #  Whether the startup file can be executed.     then         $bindir/mysqld_safe --datadir = "$datadir"  --pid-file= "$mysqld _pid_file_path"   >/dev/null &         return_value=$? #  whether the return value is handled is the key to distinguishing whether the script is professional.         sleep 2        #  make lock for centos        if test -w   "$lockdir"    #  lock directory is writable.         then             touch  "$lock _file_path"   #  create lock file.         fi        exit  $return _value    else         log_failure_msg  "Couldn ' t find mysql server  ($bindir/mysqld_ Safe) "    fi}# stop funcstop () {    if test -s   "$mysqld _pid_file_path"  #  whether the PID file exists and the size is greater than 0.     then        mysqld_pid= ' cat  ' $mysqld _pid_ File_path "'         if  (kill -0  $mysqld _pid 2>/ Dev/null)  #  Check whether the PID corresponding process exists.         then             echo  "Shutting down mysql"              kill  $mysqld _pid  #  can not take-9, otherwise the consequences of self-esteem.             return_value=$?            sleep 2         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        if  test -f  "$lock _file_path"         then             rm -f  "$lock _file_path"          fi        exit  $return _value     else        log_failure_msg  "mysql server pid file could  not be found! "     fi}case  "$"  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. "            exit 1        fi         ;;     *)         echo  "usage: $0   {start|stop|restart} "        exit 1esacexit  $return _ value  #是否处理好返回值是区别脚本是否专业规范的关键.

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Developing Enterprise standard service startup script case (MySQL) through shell