企业案例:开发mysql多实例启动脚本:
实现:mysql多实例的start/stop/restart,并且由chkconfig管理
mysql多实例路径为:

[root@jason ~]# ls -ld /data/3306/   
drwxr-xr-x 3 mysql mysql 4096 Oct  9 13:28 /data/3306/

1)已知mysql多实例启动命令为:

mysql_safe --default-file=/data/3306/my.cnf &

2)停止命令为:

mysqladmin -uroot -poldboy123 -S /data/3306/mysql.sock shutdown

注:其实启动脚本可以更简化,当然作者本人展示的是以谨慎的方式来编写。


写脚本思路:

定义一系列变量

fun_start(){
    如果mysql.sock存在那么就提示mysql正在运行

    否则 启动mysql进程,并且通过netstat命令查看进程号,通过返回值判断是否等于0,如果等于0,那么就提示启动成功,如果不等于0就提示失败
}

fun_stop(){
    如果mysql.sock不存在那么就提示mysql未运行,然后退出
    否则 关闭mysql进程,并且通过netstat命令查看进程号,通过返回值判断是否不等于0,如果不等于0,那么就提示停止成功,如果等于0就提示失败

}

fun_restart(){
        调用fun_stop函数 
        休息2s
        然后再调用fun_start函数
        并且通过netstat命令查看进程号,通过返回值判断是否等于0,如果等于0,那么就提示启动成功,如果不等于0就提示失败
}

准备使用chkconfig启动和关闭顺序为13和20,查看是否被占用:

`[root@oldboy etc]# ls /etc/rc* |egrep "13|20"`  #<==结果为空,那么可以使用13和20

MySQL多实例启动脚本展示:


[root@jason ~]# cat /data/3306/mysql
#!/bin/sh
#chkconfig:2345 13 20
#This is mysql start|stop|restart scripts.
#-------------------------------------
#Author:jason
#QQ:760966297
#mile:jasonminghao@163.com
#-------------------------------------
[ -f /etc/init.d/functions ]&& . /etc/init.d/functions
Mysql_User=root
Mysql_Password=oldboy123
Mysql_Port=3306
Mysql_Path=/data/${Mysql_Port}
Mysql_Sock=/data/${Mysql_Port}/mysql.sock
Cmd_Path=/application/mysql/bin

fun_usage(){
        echo "USAGE $0:{start|stop|restart}"
                exit 1
}

fun_start(){
if [ -e $Mysql_Sock ];then 
        action "MySQL is running." /bin/false
   else 
        /bin/sh ${Cmd_Path}/mysqld_safe --defaults-file=$Mysql_Path/my.cnf  2>&1 >/dev/null & #Mysql start
        sleep 2
        netstat -lntup |grep 3306  >/dev/null  #acheck mysql process

   [ $? -eq 0 ]&&action "Mysql start successfully." /bin/true || action "Mysql startup failure." /bin/false
fi
}

fun_stop(){
if [ ! -e $Mysql_Sock  ];then 
        action "MyySQL is not run." /bin/false 
   exit 2
 else
        ${Cmd_Path}/mysqladmin -u${Mysql_User} -p${Mysql_Password} -S ${Mysql_Sock} shutdown
        netstat -lntup |grep 3306 >/dev/null
   [ $? -ne 0 ]&& action "Mysql stop is successfully." /bin/true || action "Mysql stop is failure." /bin/false  
fi
}

fun_restart(){
        fun_stop 
        sleep 2
        fun_start
        netstat -lntup |grep 3306  >/dev/null
         [ $? -eq 0 ]&& action "Mysql restart is successfully." /bin/true || action "Mysql restart is failure." /bin/false
exit 103
}

case $1 in
start)
        fun_start
        ;;
stop)
        fun_stop
        ;;
restart)
        fun_restart
        ;;
*)
          fun_usage
        ;;
esac

脚本测试:


[root@jason ~]# /data/3306/mysql start
Mysql start successfully.                                  [  OK  ]
[root@jason ~]# /data/3306/mysql stop
Mysql stop is successfully.                                [  OK  ]
[root@jason ~]# /data/3306/mysql restart   #<==这里因为是在代码中定义了进程不存在就会提示
MyySQL is not run.                                         [FAILED]
[root@jason ~]# /data/3306/mysql start
Mysql start successfully.                                  [  OK  ]
[root@jason ~]# /data/3306/mysql restart
Mysql stop is successfully.                                [  OK  ]
Mysql start successfully.                                  [  OK  ]
Mysql restart is successfully.                             [  OK  ]

将mysql启动脚本加入开机自启动:

[root@jason ~]# cp /data/3306/mysql /etc/init.d/   #<==将mysql启动文件拷贝到/etc/init.d
[root@jason ~]# ls /etc/init.d/mysql       
/etc/init.d/mysql
[root@jason ~]# chmod +x /etc/init.d/mysql    #<==为mysql文件增加执行权限
[root@jason ~]# chkconfig --add mysql  #<==添加到chkconfig管理
[root@jason ~]# chkconfig --list mysql
mysql           0:off   1:off   2:on    3:on    4:on    5:on    6:off