环境:centos7,yum 安装mariadb5.5
mkdir /mysqldb/{3306,3307.3308}/{etc,socket,pid,log,data} -pv
chown -R mysql.mysql /mysqldb/
mysql_install_db --datadir=/mysqldb/3306/data --user=mysql --basedir=/usr datadir数据库路径 basedir程序路径
mysql_install_db --datadir=/mysqldb/3307/data --user=mysql --basedir=/usr
mysql_install_db --datadir=/mysqldb/3308/data --user=mysql --basedir=/usr
mysql -e 'show variables like "basedir";' 查看basedir路径
vim /mysqldb/3306/etc/my.cnf
cp /etc/my.cnf /mysqldb/3306/etc/
[mysqld]
port=
datadir=/mysqldb//data
socket=/mysqldb//socket/mysql.sock symbolic-links= [mysqld_safe]
log-error=/mysqldb//log/mariadb.log
pid-file=/mysqldb//pid/mariadb.pid
cp /mysqldb/3306/etc/my.cnf /mysqldb/{3307,3308}/etc/
sed -i 's/3306/3307/' /mysqldb/3307/etc/my.cnf 将3306改为3307
sed -i 's/3306/3307/' /mysqldb/3308/etc/my.cnf 将3306改为3308
cd /mysqldb/3306
vim mysqld 制作脚本
#!/bin/bash port=
mysql_user="root"
mysql_pwd="" root的数据库密码,关闭数据库时调用,不用再输入,输错,关闭时会报错
cmd_path="/usr/bin"
mysql_basedir="/mysqldb"
mysql_sock="${mysql_basedir}/${port}/socket/mysql.sock" function_start_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "Starting MySQL...\n"
${cmd_path}/mysqld_safe --defaults-file=${mysql_basedir}/${port}/etc/my.cnf &> /dev/null &
else
printf "MySQL is running...\n"
exit
fi
} function_stop_mysql()
{
if [ ! -e "$mysql_sock" ];then
printf "MySQL is stopped...\n"
exit
else
printf "Stopping MySQL..\n"
# ${cmd_path}/mysqladmin -u ${mysql_user} -p${mysql_pwd} -S ${mysql_sock} shutdown
#此行注释的是关闭脚本时需要使用密码
${cmd_path}/mysqladmin -u ${mysql_user} -S ${mysql_sock} shutdown
fi
} function_restart_mysql()
{
printf "Restarting MySQL...\n"
funtions_stop_mysql
sleep
funtion_start_mysql
} case $ in
start)
function_start_mysql
;;
stop)
function_stop_mysql
;;
restat)
function_restart_mysql
;;
*)
printf "Usage: ${mysql_basedir}/${port}/bin/mysqld {start|stop|restart}\n"
esac
chmod 700 mysqld 设置高权限,脚本内会保存一个关闭服务的密码
启动时带上路径
/mysqldb/3306/mysqld start|stop|restart
/mysqldb/3307/mysqld start|stop|restart
/mysqldb/3308/mysqld start|stop|restart
进入数据库需要带上路径
mysql -S /mysqldb/3306/socket/mysql.sock
mysql -S /mysqldb/3307/socket/mysql.sock
mysql -S /mysqldb/3308/socket/mysql.sock
进入数据库为root增加密码
update mysql.user set password=password("centos") where user='root'; 为数据库mysql的用户增加密码,并加密密码,用户名为root
flush privileges 刷新权限,启用密码
mysql -S /mysqldb/3306/socket/mysql.sock -uroot -pcentos 在数据库外设定root密码,在数据库里面设定密码后需要刷新权限,否则还是用旧密码进入,刷新后按数据库内新密码进入
增加密码后数据库连接,需要加上账号和密码
mysql -S /mysqldb/3306/socket/mysql.sock -uroot -pcentos
select user,password,host from mysql.user; 查看mysql数据库的user,password,host,信息,以user为索引
drop user ''@'localhost';
drop user ''@'localhost.localdomain';
drop user'root'@'localhost.localdomain'; 删除空账号,删除几个ipv6地址账号
drop user'root'@'::1';
show databases; 查看本Mysql里的数据库文件
drop database test; 删除无用的test数据库
破解登陆mysql密码:
vim /mysqldb/3306/etc/my.cnf
[mysqld]
port=
datadir=/mysqldb//data
socket=/mysqldb//socket/mysql.sock
skip_grant_tables 添加此行
symbolic-links= [mysqld_safe]
log-error=/mysqldb//log/mariadb.log
pid-file=/mysqldb//pid/mariadb.pid
重启服务,即可空口令进入