Linux下安装Mysql数据库
CentOS 7下yum成功安装 MySQL 5.7
- 第一部分:CentOS 7安装MySQL 5.7
1.下载YUM库
shell > wget http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm
2.安装YUM库
yum localinstall -y mysql57-community-release-el7-7.noarch.rpm
3.安装数据库
yum install -y mysql-community-server
4.启动MySQL服务
systemctl start mysqld.service
systemctl restart mysqld.service
5.默认空密码
shell > mysql -uroot -p
6.重置root密码后重启mysql服务
shell > update mysql.user set authentication_string=password(‘FengZe123’) where user=“root” and Host=“localhost”;
shell > flush privileges;
shell > quit;
shell > systemctl restart mysqld;
如果手贱或者不知道啥原因出现如下问题:
ERROR 1045 (28000): Access denied for user ‘root’@‘localhost’ (using password: NO)
请修改my.cnf,添加skip-grant-tables和skip-networking:
shell > vi /etc/my.cnf
[mysqld]
skip-grant-tables
skip-networking
重启mysql,然后重复以上修改密码步骤即可,记得修改完后,去掉my.cnf添加的两行。
便捷办法
- 第二部分:配置
1、添加远程登录用户(登入Mysql)
use mysql;
GRANT ALL PRIVILEGES ON*.* TO ‘root’@’%’ IDENTIFIED BY ‘FengZe123’ WITH GRANT OPTION;
注意:
问题:ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
解决办法:
1、创建用户时报错:
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
报错原因:密码强度不够。
解决方法:(该账号为测试账号,所以采用降低密码策略强度)
mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)
mysql> set global validate_password_length=4;
Query OK, 0 rows affected (0.00 sec)
mysql> 再用1的方法;
2.ALTER USER USER() IDENTIFIED BY ‘FengZe123’;
GRANT ALL PRIVILEGES ON *.* TO ‘root’@’%’ IDENTIFIED BY ‘你的密码’ WITH GRANT OPTION;
3、检查用户表,刷新内存权限
select host, user from user;
FLUSH PRIVILEGES;
退出Mysql;
4、设置防火墙(CentOS7 不推荐)
vi /etc/sysconfig/iptables
在-A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited之前,添加
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
重启防火墙
service iptables restart
注:
centos7使用的是firewall防火墙
systemctl stop firewalld.service #停止
systemctl disable firewalld.service #禁用
5、设置字符编码集和区分大小写
5.1修改mysql配置文件(设置字符编码集)
默认位置:/etc/my.cnf
进入etc文件夹>>vim my.cnf
[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci
创建数据库:create database 名字;
创建表格:create table(名字+类性);
查看数据库:show databases;
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