wget https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm
rpm -ivh mysql57-community-release-el7-11.noarch.rpm
vim mysql-community.repo
把要用的版本enable成1，其他成0
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/7/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
yum list mysql-community-server
yum install mysql-community-server
改/etc/my.cnf
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
character-set-server=utf8mb4
port=5391
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
sort_buffer_size=2M
join_buffer_size=4M
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[mysql]
default-character-set=utf8mb4
