在MySQL数据库部署的过程中，在安装了MySQL软件，并配置了my.cnf配置文件后，需要创建MySQL实例。
MySQL 5.5实例创建完成了，默认会有登陆用户名和密码为空的用户，一般需要修改root用户密码，并删除无效用户，然后才能提供给应用使用。
这个过程可以通过shell脚本自动完成实例创建，启动，自动生成密码，修改root用户密码，删除无效用户。
shell脚本有多种编写方法，我编写的shell脚本如下：
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#!/bin/bash
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# this scripts used to initial the mysql instance and modify password
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# created by zhaofx
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# MySQL software directory.
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readonly SYMLINK='/usr/local/mysql'
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echo "MySQL的软件安装目录为${SYMLINK}"
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# MySQL database port
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readonly MYSQL_PORT=3306
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echo "MySQL实例的端口为${MYSQL_PORT}"
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# MySQL database directory.
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readonly MYSQL_DATA_DIR="/data/mysql_${MYSQL_PORT}"
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echo "MySQL的实例数据文件目录为${MYSQL_DATA_DIR}"
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echo "准备创建MySQL实例"
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cd $SYMLINK
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./scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=${MYSQL_DATA_DIR}/data
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echo "开始启动数据库实例，修改root用户密码，删除无效用户"
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echo ""
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cp /etc/my.cnf /data/mysql_${MYSQL_PORT}/my.cnf
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echo "Startup MySQl Service:localhost_"${MYSQL_PORT}
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/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql_${MYSQL_PORT}/my.cnf &
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echo ""
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# MySQL root password
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# 随机生成八位密码，作为MySQL的密码
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for i in {1..10}
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do
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A=`head -c 500 /dev/urandom | tr -dc a-zA-Z | tr [a-z] [A-Z]|head -c 1`
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B=`head -c 500 /dev/urandom | tr -dc a-z0-9A-Z | head -c 6`
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C=`echo $RANDOM|cut -c 2`
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echo $A$B$C > /home/mysql/.password_mysql
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done
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readonly MYSQL_ROOT_PASS=$A$B$C
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echo "MySQL实例的root用户密码已经生成"
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su - mysql <<EOF
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/usr/local/mysql/bin/mysql -uroot -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock -e "select user,host from mysql.user;"
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/usr/local/mysql/bin/mysqladmin -uroot -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock password "${MYSQL_ROOT_PASS}"
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EOF
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echo "MySQL的root用户密码已经修改"
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echo ""
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/usr/local/mysql/bin/mysql -uroot -p${MYSQL_ROOT_PASS} -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock -e "delete from mysql.user where user='';delete from mysql.user where user='root' and host!='localhost'; FLUSH PRIVILEGES;"
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/usr/local/mysql/bin/mysql -uroot -p${MYSQL_ROOT_PASS} -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock -e "delete from mysql.db where db='test' or db='test\\_%'; FLUSH PRIVILEGES;"
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echo "MySQL实例启动成功，初始用户环境修改完毕"
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echo ""
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/usr/local/mysql/bin/mysql -uroot -p${MYSQL_ROOT_PASS} -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock -e " show databases;"
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/usr/local/mysql/bin/mysql -uroot -p${MYSQL_ROOT_PASS} -S /data/mysql_${MYSQL_PORT}/tmp/mysql.sock -e " select user,host from mysql.user;"
大家可以参考！
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/24638123/viewspace-1783416/
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