MySQL8.0版本安装后授权

mysql8.0 安装

1.解压

tar -xvf mysql-8.0.27-linux-glibc2.12-x86_64.tar.xz

cd /usr/local/mysql/

mv mysql-8.0.27-linux-glibc2.12-x86_64 /usr/local/mysql

cd /usr/local/mysql

mkdir data

cd /tmp/

mkdir mysql

2.编辑 my.cnf

vi /etc/my.cnf

[client]
port=3306
socket=/tmp/mysql/mysql.sock

[mysqld]
port=3306
user=mysql
socket=/tmp/mysql/mysql.sock
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
log-error=error.log

transaction_isolation = READ-COMMITTED
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
lower_case_table_names = 1

#skip-grant-tables

3.创建用户

groupadd mysql

useradd -g mysql mysql

4.更改目录权限

chown -R mysql:mysql /tmp/mysql

chown -R mysql:mysql /usr/local/mysql

chmod -R 755 /tmp/mysql /usr/local/mysql

5. 初始化

cd /usr/local/mysql

./bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/

如有报错

./bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory

则需要安装libaio包

[root@80_2 mysql]# yum install -y libaio

6.初始化密码

初始化时并没有出现初始密码，因此需要修改密码。

注释 skip-grant-tables,可以使用无密码登录

7.启动 mysql

[root@80_2 mysql]# ./support-files/mysql.server start

8.登录mysql
/usr/local/mysql/bin/mysql -u root -p 直接回车

9.清空密码

use mysql；

update user set authentication_string='' where user='root';

10.去掉无密码登录

vim /etc/my.cnf

./support-files/mysql.server restart

/usr/local/mysql/bin/mysql -u root -p直接回车

11.修改密码

mysql>alter user root@'localhost' identified by '123456'；这样就修改好密码了。

mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.27 |
+-----------+

12.设置自动启动

cd support-files/

cp mysql.server /etc/init.d/mysql

chmod 755 /etc/init.d/mysql

cd /etc/init.d

chkconfig --add mysql

chkconfig --level 345 mysql on

13.重启mysql

service mysql restart

service mysql stop

(1)创建可远程连接用户

CREATE USER 'root'@'%' IDENTIFIED BY '111111';※创建用户

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '111111'; ※修改用户密码

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION; ※授权给用户

FLUSH PRIVILEGES; ※刷新权限

如果用Navicat连接的回报不支持caching_sha2_password验证方式的错误。

将远程访问用户的验证方式改为： msyql_native_password

(2)查看用户

select host,user,plugin,authentication_string from mysql.user;

备注：host为 % 表示不限制ip localhost表示本机使用 plugin非mysql_native_password 则需要修改密码

(3)修改用户密码

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'newpassword'; #更新一下用户的密码 root用户密码为newpassword