Mysql记录
一、Mysql5.7安装(Centos 7)
- 下载mysql的repo源 ==> wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
- 安装rpm包 ==> sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm
- 安装mysql ==> sudo yum install mysql-server
二、重置密码
重置密码前,首先要登录
mysql -u root
登录时有可能报这样的错:ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2),原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户:
sudo chown -R openscanner:openscanner /var/lib/mysql
如果报chown: 无效的用户: "openscanner:openscanner"
错误,更换命令,并用 ll 查看目录权限列表
chown root /var/lib/mysql/
然后,重启服务:
service mysqld restart
登录重置密码:
mysql -u root -p
mysql > use mysql;
mysql > update user set password=password('123456') where user='root';
mysql > exit;
重启mysql服务
service mysqld restart
三、开放3306端口
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all
四、修改最大连接数
1、编辑mysql配置文件
vim /etc/my.cnf
2、在[mysqld]分段下添加一行:
max_connections=10000
3、编辑/usr/lib/systemd/system/mysqld.service配置文件
4、在文件尾部添加2行:
LimitNOFILE=65535
LimitNPROC=65535
5、重启使mysql配置生效
systemctl daemon-reload
systemctl restart mysqld.service
6、查看mysql最大连接数
select @@max_connections;
五、解决远程连接
1、改表法
mysql -u root -pvmwaremysql>use mysql;
mysql>update user set host = '%' where user = 'root';
mysql>select host, user from user;
2、授权法
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
允许用户myuser从ip为192.168.1.3的主机连接到mysql服务器,并使用mypassword作为密码
GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.1.3' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
刷新权限使之生效
mysql>flush privileges;
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