centos（linux/unix系）上安装和配置mariaDB

由于从所周知的原因，mysql不能在新版centos上用了。
其实很简单，网上很多文章的介绍其实都是来源于官网

1. 安装过程
   https://downloads.mariadb.org/mariadb/repositories/#mirror=neusoft&distro=CentOS&distro_release=centos7-amd64--centos7&version=10.2

它会自动为我们生成repo, 然后复制粘贴就行

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创建repo文件，然后yum install MariaDB-server MariaDB-client就行

2. 配置过程
   1）先启动服务
   systemctl start mariadb
   是的，现在建议用systemctl替代service命令
   2）再配置mysql_secure_installation

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3）设置密码
这里不知道密码，中断了去设置密码
systemctl stop mariadb.service
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

然后输入sql指令
MariaDB [mysql]> update mysql.user set authentication_string=password('255') where user='root';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

MariaDB [mysql]> flush privileges;
Query OK, 0 rows affected (0.00 sec)

再回来mysql_secure_installation并输入密码，会有以下交互
Remove anonymous users? [Y/n] <– 是否删除匿名用户,生产环境建议删除，所以直接回车
… Success!
Normally, root should only be allowed to connect from 'localhost'. This
ensures that someone cannot guess at the root password from the network.
Disallow root login remotely? [Y/n] <–是否禁止root远程登录,根据自己的需求选择Y/n并回车,建议禁止
… Success!
By default, MySQL comes with a database named 'test' that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.
Remove test database and access to it? [Y/n] <– 是否删除test数据库,直接回车

以后这样登录：
mysql -uroot -p 并且输入密码，不能再只使用不安全的不带参数的mysql了

如果需要安装pdo_mysql记得只需要以下一句就可以了，不需要网上说的还要手动编译源码
yum install php-mysql