删除旧包：
# rpm -qa | grep -i mysql
# rpm -ev mysql-libs-* --nodeps
安装rpm包：
# rpm -ivh mysql-community-common-5.7.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-libs-5.7.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-client-5.7.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-server-5.7.17-1.el7.x86_64.rpm
启动、停止：
# service mysqld start
# service mysqld stop
# service mysqld status
初始随机密码：
# cat /var/log/mysqld.log | more
修改初始密码及授权远程访问：
# mysql -uroot -p
mysql> set password=‘[email protected]‘;
mysql> grant all privileges on *.* to ‘root‘@‘%‘ identified by ‘[email protected]‘;
密码复杂度属性：
mysql> set global validate_password_policy=0;
validate_password_policy有以下取值：（默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。）
| Policy | Tests Performed |
|---|---|
0 or LOW |
Length |
1 or MEDIUM |
Length; numeric, lowercase/uppercase, and special characters |
2 or STRONG |
Length; numeric, lowercase/uppercase, and special characters; dictionary file |
修改数据目录：
新目录需要给mysql用户授权，mysqld_safe日志文件授权，关闭selinux（没找到相关策略设置的方法）
# mkdir /data/mysql/data
# mv /var/lib/mysql/* /data/mysql/data/
# mkdir /data/mysql/log
# chown mysql:mysql -R /data/mysql
# touch mysqld_safe.log
# chown mysql:mysql mysqld_safe.log
# vi /etc/my.cnf
/**
[client]
port = 3306
socket = /data/mysql/log/mysql.sock
default-character-set=utf8
[mysql]
no-auto-rehash
socket=/data/mysql/log/mysql.sock
default-character-set=utf8
[mysqld]
port = 3306
socket = /data/mysql/log/mysql.sock
character-set-server=utf8
lower_case_table_names=1
basedir=/usr
datadir=/data/mysql/data
log-error=/data/mysql/log/error.log
pid-file=/data/mysql/log/mysql.pid
init_connect=‘SET NAMES utf8‘
symbolic-links=0
skip-external-locking
key_buffer_size = 16M
max_allowed_packet = 1M
table_open_cache = 64
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
[mysqld_safe]
log-error=/data/mysql/log/mysqld_safe.log
*/
# getenforce
Enforcing
# setenforce 0
# vi /etc/selinux/config
/**
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
#SELINUX=enforcing
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
*/
# service mysqld start
其他命令：
# mysqladmin -u root -p password
mysql> select version();
# chkconfig --list
# chkconfig --level 345 mysqld on
# netstat -na | grep 3306
mysql> CREATE USER ‘username‘@‘host‘ IDENTIFIED BY ‘password‘;
# service mysqld --initedialize
Usage: /etc/init.d/mysqld {start|stop|status|restart|condrestart|try-restart|reload|force-reload}
# service mysqld start
Initializing MySQL database: [ OK ]
Installing validate password plugin: [ OK ]
Starting mysqld: [ OK ]