centos7 安装mysql 5.7笔记
1. 环境
- centos7
- 阿里云服务器
2. 官网地址
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html
3. 下载repo
https://dev.mysql.com/downloads/repo/yum/
注意需要根据linux的版本选择对应的仓库
yum localinstall mysql80-community-release-el7-3.noarch.rpm
4. 修改安装msyql的版本
yum repolist enabled | grep "mysql.*-community.*"
mysql-connectors-community/x86_64 MySQL Connectors Community 153
mysql-tools-community/x86_64 MySQL Tools Community 110
mysql80-community/x86_64 MySQL 8.0 Community Server 424
修改为安装5.7
yum-config-manager --disable mysql80-community
yum-config-manager --enable mysql57-community
mysql-connectors-community/x86_64 MySQL Connectors Community 153
mysql-tools-community/x86_64 MySQL Tools Community 110
mysql57-community/x86_64 MySQL 5.7 Community Server 424
5. 安装
yum install mysql-community-server
6. 启动
service mysqld start
service mysqld status
7. 查询密码
grep ‘temporary password’ /var/log/mysqld.log
mysql -uroot -p
8. 修改初始密码
ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘MyNewPass4!’;
默认有validate_password会验证密码,需要大写字母等等
set global validate_password_policy=0;
set global validate_password_length=1;
9. 修改远程访问权限
update mysql.user set host=’%’ where user=‘root’;
flush privileges;
9.1. 方法2
grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
flush privileges;
10. 设置字符集为utf-8
#在[mysqld]部分添加：
character-set-server=utf8
#在文件末尾新增[client]段，并在[client]段添加：
default-character-set=utf8
vim /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
character-set-server=utf8
[client]
default-character-set=utf8
11. 修改开启启动Mysql
#启动之前需要生成临时密码，需要用到证书，可能证书过期，需要进行更新操作
yum update -y
#启动mysql服务
service mysqld start
#设置mysql开机启动
chkconfig mysqld on
12. 查看属性
https://dev.mysql.com/doc/refman/5.6/en/environment-variables.html
show VARIABLES like '%dir%' ;
13. 遇到问题
13.1. xx.so文件找不到
应该是安装的版本不对，修改了下repo，卸载之后重新安装了
13.2. 启动后查询不到密码
看日志发现数据库初始化时候错误
- 因为之前装过mysql， /var/lib/mysql 中有数据,清空重装好了.
14. 其他命令
yum list installed |grep mysql
yum removee -y mysql
yum update
yum clean all
yum makecache