mysql 初始化脚本

脚本须知：

　　1. 确认mysql的数据目录，二进制日志目录，中继日志的目录，安装目录的位置

2. 初始化会对前三个目录执行清空操作，不过清空前该脚本对其进行了压缩打包统一存放在/tmp目录下

3. 脚本运行完应该查看服务是否启动正常，如果不正常请检查配置文件/etc/my.cnf和相关目录的权限属主问题

4. 此脚本对需要快速恢复mysql到初始状态的情况比较适宜 比如（主从复制出现问题，已经不能简单的靠2进制日志解决，此时可以用该脚本初始化mysql salve

服务器 然后用完全备份加2进制重新与主mysql完成同步）

 #!/bin/bash
 #

 # function
 clean_dir(){
 cd $
 name=`echo $ | sed 's@/@@' | sed 's@/@_@g'`
 tar -jcf $name.tar.bz2 * &> /dev/null
 \mv -f $name.tar.bz2 /tmp/
 rm -rf *
 }

 mysql_init(){
 $basedir/scripts/mysql_install_db --defaults-file=/etc/my.cnf \
 --basedir=$basedir \
 --datadir=$datadir \
 --user=mysql
 if [ $? -eq  ];then
     echo "----------->initiate is finished"
 else
     echo "------------>initiate is failed"
     return
 fi
 }

 info_check(){
     read -p "Please give the MySQL data directory: " datadir
     if [ ! -d $datadir ];then
         echo 'directory does not exist !'
         exit
     fi
     read -p "Please give a binary file directory: " bindir
     if [ ! -d $bindir ];then
         echo 'directory does not exist !'
         exit
     fi
     read -p "Please give the relay log directory: " relaydir
     if [ ! -d $relaydir ];then
         echo 'directory does not exist !'
         exit
     fi
     read -p "Please give the Mysql Install directory: " basedir
     if [ ! -d $basedir ];then
         echo 'directory does not exist !'
         exit
     fi
     echo -e "\033[31mPlease verify your give Mysql information:\n\
      MySQL data directory: $datadir\n\
      MySQL Install directory: $basedir\n\
      Binary file directory: $bindir\n\
      Relay log directory: $relaydir\n\[0m"
 }

 # main
 info_check
 sleep
 while true;do
     read -p "Confirm please enter yes, change directory information please input C: " ans
     if [ $ans == "yes" ];then
         break
     elif [ $ans == "c" -o $ans == "C" ];then
         info_check
         sleep
     else
         echo "Option only supports: yes | c"
         continue
     fi
 done
 echo -e "\033[31mMySQL database initialization......\033[0m"
 service mysqld stop &> /dev/null || kill  `cat /var/run/mysqld/mysqld.pid`
 dir=`echo  $datadir $bindir $relaydir | xargs -n  echo | sort -u`
 for i in $dir ;do
     clean_dir $i
 done
 # If the MySQL service is started
 # ps -ef | grep -E "mysqld[[:space:]]+" | awk -F ' ' '{ print $8 }' | xargs dirname | sed -r 's@[^/]+/?$@@'
 mysql_init $datadir $basedir
 if [ $? -eq  ];then
     chown -R mysql.mysql {$datadir,$bindir,$relaydir}
     service mysqld start
 fi