centos7安装apache、php7.2、mysql

安装httpd（apache）

安装命令：yum install -y httpd
启动命令：systemctl start httpd.service

安装PHP7.2

更新yum源：
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm

安装命令：
yum -y install php72w php72w-cli php72w-common php72w-devel php72w-embedded php72w-fpm php72w-gd php72w-mbstring php72w-mysqlnd php72w-opcache php72w-pdo php72w-xml

检测是否成功：php -v
查看php拓展：php -m

安装mysql

下载官方Repository：wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm

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

安装MySQL服务器：yum -y install mysql-community-server

启动mysql：systemctl start mysqld.service

查看mysql状态：systemctl status mysqld.service

此时MySQL已经开始正常运行，但是要想进入MySQL需要先找出此时root的初始密码，通过如下命令可以在日志文件中找出密码：
grep "password" /var/log/mysqld.log
结果如下：
2019-08-25T15:41:59.182937Z 1 [Note] A temporary password is generated for root@localhost: AmuX<tMcD2Df
AmuX<tMcD2Df就是此时root用户的密码。

登录mysql：mysql -uroot -p ，回车，然后输入刚才得到的密码。

登录mysql后修改初始密码：ALTER USER 'root'@'localhost' IDENTIFIED BY '123123';

如果出现错误：ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
解决方法：
1：set global validate_password_policy=0;
2：set global validate_password_length=1;
3：ALTER USER 'root'@'localhost' IDENTIFIED BY '123123';