centos下操作

0x001 安装和启动mysql

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其实已经换成mariadb了；

1. 搜索：yum list|grep mariadb
2. 安装：yum install mariadb mariadb-server`
3. 启动：service mariadb start
4. 开机自动启动：systemctl enable mariadb

0x002 初始化密码mysql

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1. 切换数据库： use mysql
2. 设置新密码：update user set password =PASSWORD('rooter') where user ='root';
3. flush privileges

0x003 开启远程连接mysql

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1. GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'rooter' WITH GRANT OPTION;
2. flush privileges

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0x004 开启ssh

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1. 查看是否安装ssh：rpm -qa | grep ssh
2. 未安装：yum install openssh-server
3. 启动：service sshd start
4. 开机启动：chkonfig sshd on(off 是关闭)

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0x005 开启apahce

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1. 查看是否安装ssh：rpm -qa | grep httpd
2. 未安装：yum install httpd
3. 启动：service httpd start

   sudo usr/sbin/apachectl -k start

4. 开机启动：chkonfig httpd on(off 是关闭)
5. 默认项目目录：/var/www/html

0x006 开启php

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1.安装php：yum install php php-mysql
2.重启apache：service httdp restart

3. 测试数据库链接：
   $servername = "localhost";
   $username = "username";
   $password = "password";

    // 创建连接
    $conn = new mysqli($servername, $username, $password);
   
    // 检测连接
    if ($conn->connect_error) {
        die("连接失败: " . $conn->connect_error);
    } 
    echo "连接成功";
    ?>