CentOS7.4安装MySQL 5.7.21

1.解压 

tar -xvf mysql-5.7.21-1.el7.x86_64.rpm-bundle.tar

2.移除centos7自带的mariadb-libs包

yum remove -y mariadb-libs

3.安装解压后的rpm包

In most cases, you need to install the mysql-community-server, mysql-community-client, mysql-community-libs, mysql-community-common, and mysql-community-libs-compat packages to get a functional, standard MySQL installation. To perform such a standard, basic installation, go to the folder that contains all those packages 

yum install mysql-community-{server,client,common,libs}-*

A standard installation of MySQL using the RPM packages result in files and resources created under the system directories, shown in the following table.

Files or Resources	Location
Client programs and scripts	/usr/bin
mysqld server	/usr/sbin
Configuration file	/etc/my.cnf
Data directory	/var/lib/mysql
Error log file	For RHEL, Oracle Linux, CentOS or Fedora platforms: /var/log/mysqld.log For SLES: /var/log/mysql/mysqld.log
Value of secure_file_priv	/var/lib/mysql-files
System V init script	For RHEL, Oracle Linux, CentOS or Fedora platforms: /etc/init.d/mysqld For SLES: /etc/init.d/mysql
Systemd service	For RHEL, Oracle Linux, CentOS or Fedora platforms: mysqld For SLES: mysql
Pid file	/var/run/mysql/mysqld.pid
Socket	/var/lib/mysql/mysql.sock
Keyring directory	/var/lib/mysql-keyring
Unix manual pages	/usr/share/man
Include (header) files	/usr/include/mysql
Libraries	/usr/lib/mysql
Miscellaneous support files (for example, error messages, and character set files)	/usr/share/mysql

4.启动并登陆MySQL

systemctl start mysqld.service

At the initial start up of the server, the following happens, given that the data directory of the server is empty:

• The server is initialized.

• An SSL certificate and key files are generated in the data directory.

• validate_password is installed and enabled.

• A superuser account 'root'@'localhost' is created. A password for the superuser is set and stored in the error log file. To reveal it, use the following command for RHEL, Oracle Linux, CentOS, and Fedora systems:

找出root的密码

grep 'temporary password' /var/log/mysqld.log

mysql -uroot -p

ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass4!';

设置允许远程访问

grant all privileges on *.* to 'root'@'%' identified by 'password' with grant option;