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【MySQL】重置MySQL的root密码与修改MySQL默认字符集

时间:2021-07-01 10:21:17 帮助过:40人阅读

第一次在Rails开发中使用MySQL数据库,结果root密码也不知道如何安装的,始终无法登录root,于是想到重置密码,在网上找了很多办法,下面这个是最靠谱的: 新建一个脚本如下: #!/bin/bashPATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbi



第一次在Rails开发中使用MySQL数据库,结果root密码也不知道如何安装的,始终无法登录root,于是想到重置密码,在网上找了很多办法,下面这个是最靠谱的:


新建一个脚本如下:

#!/bin/bash
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

# Check if user is root
if [ $(id -u) != "0" ]; then
    printf "Error: You must be root to run this script!\n"
    exit 1
fi

echo "=========================================================================\n"
printf "Reset MySQL root Password for LNMP  ,  Written by Licess \n"
printf "=========================================================================\n"
printf "LNMP is a tool to auto-compile & install Nginx+MySQL+PHP on Linux \n"
printf "This script is a tool to reset mysql root password for lnmp \n"
printf "For more information please visit http://www.lnmp.org \n"
printf "\n"
printf "Usage: sh reset_mysql_root_password.sh\n"
printf "=========================================================================\n"

mysql_root_password=""
read -p "(Please input New MySQL root password):" mysql_root_password
if [ "$mysql_root_password" = "" ]; then
	echo "Error: Password can't be NULL!!\n"
	exit 1
fi

printf "Stoping MySQL...\n"
/etc/init.d/mysql stop
printf "Starting MySQL with skip grant tables\n"
/usr/bin/mysqld_safe --skip-grant-tables >/dev/null 2>&1 &
printf "using mysql to flush privileges and reset password\n"
sleep 10
printf "update user set password = Password('$mysql_root_password') where User = 'root'\n"
/usr/bin/mysql -u root mysql << EOF
update user set password = Password('$mysql_root_password') where User = 'root';
EOF

reset_status=`echo $?`
if [ $reset_status = "0" ]; then
printf "Password reset succesfully. Now killing mysqld softly\n"
killall mysqld
sleep 10
printf "Restarting the actual mysql service\n"
/etc/init.d/mysql start
printf "Password successfully reset to '$mysql_root_password'\n"
else
printf "Reset MySQL root password failed!\n"
fi

其中有些地方需要自己手工修改,例如:

/usr/bin/mysqld_safe --skip-grant-tables >/dev/null 2>&1 &


在我的电脑中输入命令: whereis mysqld_safe

结果如下:

mysqld_safe: /usr/bin/mysqld_safe /usr/bin/X11/mysqld_safe /usr/share/man/man1/mysqld_safe.1.gz

所以根据个人情况就修改第31行。

还有一个是第35行,我执行:whereis mysql,结果如下:

mysql: /usr/bin/mysql /etc/mysql /usr/lib/mysql /usr/bin/X11/mysql /usr/include/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz


至于MySQL默认字符集的修改如下:

这里只考虑linux系统,找到/etc/mysql/my.cnf ,使用root权限打开,

做以下改动:

配置文件中添加如下内容:

[client]
default-character-set=utf8

[mysqld]
character_set_server=utf8
init_connect='SET NAMES utf8'

修改完后,重启mysql的服务,service mysql restart

使用 mysql> SHOW VARIABLES LIKE 'character%';查看,发现数据库编码均已改成utf8。

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