Installation of Apache

yum install httpd

After successful installation, the Apache operation command:

systemctl start httpd      //Start apache
systemctl stop httpd       //Stop apache
systemctl restart httpd    //Restart apache
systemctl enable httpd     //Set apache to boot

exception handling
I configure it on the Ali Cloud and have a problem of inaccessibility after starting Apache, but a general server accessing Apache may need the following operations:
(1) Open 80 ports in the firewall
Now you need to add http services to the firewall to allow external access.

firewall-cmd --add-service=http --permanent

The permanent parameter indicates that this is a permanent firewall rule, and if not, there will be no such rule after restarting the system.

For custom ports (such as 81), firewall rules need to be added.

firewall-cmd --zone=public --add-port=81/tcp --permanent

Restart Firewall to make the rule effective.

systemctl restart firewalld

(2) Turn off SELINUX

vi /etc/selinux/config

Remark the following two sentences and add the last one.

\#SELINUX=enforcing #Annotate
\#SELINUXTYPE=targeted #Annotate
SELINUX=disabled #increase

wq! Save Exit

Enter the following commands

setenforce 0 #Make the configuration take effect immediately

Installation of MariaDB (an open source branch of MySQL)

yum install mariadb mariadb-server

After successful installation of MariaDB, you need to configure MySQL root password. In addition, note the common commands to start and close MariaDB

systemctl start mariadb     //start-upMariaDB
systemctl stop mariadb      //Stop itMariaDB
systemctl restart mariadb   //restartMariaDB
systemctl enable mariadb    //Set up boot start

Setting the password for root account

mysql_secure_installation

Enter current password for root (enter for none):
Set root password? [Y/n]

Click Enter and prompt whether to set the root account password. Enter y

New password:
Re-enter new password:
Password updated successfully!

It prompts you to enter a new password and re-enter a new password. After re-entry twice, a successful prompt for updating the password appears.

Then just type y all the way.

Remove anonymous users? [Y/n] y
... Success!

Disallow root login remotely? [Y/n] y
... Success!

Remove test database and access to it? [Y/n] y
- Dropping test database...
... Success!
- Removing privileges on test database...
... Success!

Reload privilege tables now? [Y/n] y
... Success!

Thanks for using MariaDB!

After setting the root password, restart MariaDB to take effect

systemctl restart mariadb.service

Test access database:

mysql -uroot -p

Then enter the password and the login will be displayed as follows:

Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.44-MariaDB MariaDB Server

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

Enter the following command to view the database of the database server

show databases;

Exit order:

exit;

III. Installation of PHP and PHP Extension

yum install php php-mysql php-gd libjpeg* php-ldap php-odbc php-pear php-xml php-xmlrpc php-mbstring php-bcmath php-mhash

After installation, restart Apache server

systemctl restart httpd.service

Test PHP installation results

vi /var/www/html/index.php

Enter the following

<?php
  phpinfo();
?>

Input: wq! Save Exit
Enter the server address in the browser to see if you can see:

Page effects

IV. Installing phpmyadmin

Install phpmyadmin using yum

yum install phpmyadmin php-mcrypt

The default installation directory for phpMyAdmin is / usr/share/phpMyAdmin, and the virtual host configuration file / etc/httpd/conf.d/phpMyAdmin.conf (case-sensitive) is automatically created in the Apache configuration file directory. By default, phpMyAdmin on CentOS 7 only allows access from the loopback address (127.0.0.1). In order to connect remotely, you need to change its configuration.

vi /etc/httpd/conf.d/phpMyAdmin.conf

Modify the configuration file as follows:

<Directory /usr/share/phpMyAdmin/>
   AddDefaultCharset UTF-8

   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
      # Require ip 127.0.0.1  #Annotate
      # Require ip ::1   #Annotate
      Require all granted   #New addition
     </RequireAny>
 </IfModule>
 <IfModule !mod_authz_core.c>
     # Apache 2.2
     Order Deny,Allow
     Deny from All
     Allow from 127.0.0.1
     Allow from ::1
   </IfModule>
</Directory>

<Directory /usr/share/phpMyAdmin/setup/>
   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
      #Require ip 127.0.0.1  #Annotate
      #Require ip ::1   #Annotate
      Require all granted   #New addition
     </RequireAny>
   </IfModule>
   <IfModule !mod_authz_core.c>
     # Apache 2.2
     Order Deny,Allow
     Deny from All
     Allow from 127.0.0.1
     Allow from ::1
   </IfModule>
</Directory>

Then restart the Apache server

systemctl restart httpd

Then you can access it through a browser http://server ip address/phpmyadmin access