CentOS7安装MySQL8.0
下载mysql源安装包
rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
检查是否安装成功
yum repolist enabled | grep "mysql.*-community.*"
安装
yum install mysql-community-server
启动
systemctl start mysqld
systemctl restart mysqld
查看启动状态
systemctl status mysqld
设置开机启动
systemctl enable mysqld
systemctl daemon-reload
修改登录密码
mysql安装完并启动后,在/var/log/mysqld.log文件中给root生成了一个默认密码。
本地MySQL客户端登录
mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'mypassword';
use mysql;
select host, user from user;
允许远程连接
update user set host='%' where user ='root';
flush privileges;
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY 'mypassword';
修改侦听:
vi /etc/my.cnf
后面加上:
bind-address=0.0.0.0
port=8020
max_connections=200
修改后如果不能启动:
1. 防火墙问题
firewall-cmd --zone=public --add-port=8020/tcp --permanent
systemctl restart firewalld
- SELinux问题
方法一: 不需要重启Linux:
[root@dytl05 ~]# setenforce 0
方法二:需要重启Linux:
vi /etc/selinux/config
SELINUX=disabled
默认编码方式
SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';
部分参数配置查询命令
#查询mysql最大连接数设置
show global variables like 'max_conn%';
SELECT @@MAX_CONNECTIONS AS 'Max Connections';
# 查看最大链接数
show global status like 'Max_used_connections';
# 查看慢查询日志是否开启以及日志位置
show variables like 'slow_query%';
# 查看慢查询日志超时记录时间
show variables like 'long_query_time';
# 查看链接创建以及现在正在链接数
show status like 'Threads%';
# 查看数据库当前链接
show processlist;
# 查看数据库配置
show variables like '%quer%';