（一）MySQL環境安裝

wget -i -c

yum -y install mysql57-community-release-el7-10.noarch.rpm

yum -y install mysql-community-server

systemctl start mysqld.service

systemctl status mysqld.service

grep "password" /var/log/mysqld.log

# mysql -uroot -p

alter user 'root'@'localhost' identified by '654321';	-- 密碼簡單會報錯，需要設定
set global validate_password_policy=0;
set global validate_password_length=1;
alter user 'root'@'localhost' identified by '654321';

yum -y remove mysql57-community-release-el7-10.noarch

#任何主機

mysql>grant all privileges on *.* to 'root'@'%' identified by '654321' with grant option;
#指定主機
mysql>grant all privileges on *.* to 'jack'@』10.10.50.127』 identified by '654321' with grant option;
# 然後重新整理許可權
mysql>flush privileges;

mysql>use mysql;

mysql>update user set host = '%' where user = 'root';
mysql>select host, user from user;

vim /etc/my.cnf

[client]

port=3306
socket=/var/lib/mysql/mysql.sock
default-character-set=utf8
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
character-set-server=utf8
[mysql]
no-auto-rehash
default-character-set=utf8
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

systemctl restart mysqld.service

show variables like 'character_set%';

vim /etc/rc.local

systemctl start mysqld.service

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