系统版本：
Red Hat Enterprise Linux Server release 7.3 (Maipo)
yum install mysql-community-common
yum install mysql-community-client
yum install mysql-community-server
在安装mysql5.7数据库的时候，在安装mysql-community-server包的时候提示缺少libsasl2.so.2()(64bit)
解决方法：
vim /etc/yum.repos.d/mysql-community.repo
[mysql57-community]
name=MySQL 5.7 Community Server
## baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
再次安装：
yum install mysql-community-server
启动数据库：
service mysqld start
或
systemctl start mysqld
关闭数据库：
service mysqld stop
或
systemctl stop mysqld
初始化：
mysqld --initialize --user=mysql --basedir=/data/my --datadir=/data/my/data &
设置开机启动：
systemctl enable mysqld
systemctl daemon-reload
