# Applications



# Install MySQL

### Installing MySQL on Centos

#### Uninstall MariaDB

1. Uninstall MariaDB from the server

```
yum remove MariaDB-server MariaDB-client
```

#### Add the MySQL repository

1. Download and add the following MySQL Yum repository

```
Downloading respository data
============================

wget https://repo.mysql.com/mysql80-community-release-el7-1.noarch.rpm

Installing the repository data
==============================

yum localinstall mysql80-community-release-el7-1.noarch.rpm
```

#### Verify if the MySQL Yum repository has been added successfully

1. with the command below very that the MySQL Yum repository has been added successfully

```
yum repolist enabled | grep "mysql.*-community.*"
```

The result should be similar to

[![012.PNG](https://docs.azandi.co.za/uploads/images/gallery/2020-04/scaled-1680-/RgObM4enXFlI8gEx-012.PNG)](https://docs.azandi.co.za/uploads/images/gallery/2020-04/RgObM4enXFlI8gEx-012.PNG)

#### Installing MySQL Release Series

If a specific release series is required follow the following steps

1. If not already installed, install yum-config-manager  
      
    `yum update && yum install yum-utils`
2. Disable the current active sub-repository, where \[xx\] replaces the version number  
      
    `yum-config-manager --disable mysql[xx]-community`
3. Enable the appropriate sub-repository, where \[xx\] replaces the version number  
      
    `yum-config-manager --enable mysql[xx]-community`

#### Install MySQL

1. Install MySQL with the command below  
      
    `yum install mysql-community-server`

#### Start and enable MySQL

1. Start and enable MySQL with the commands below

```
Start mySQL
===========

systemctl start mysqld

Enable Mysql
============

systemctl enable mysqld
```

#### Secure MySQL installation

1. Lastly, secure the installation of MySQL by running the command below and following the prompts

```
mysql_secure_installation
```

# Install Postfix

### Installing Postfix

#### Uninstall SendMail

1. Run the command below to ensure that SendMail is removed/not installed

```
yum remove sendmail
```

#### Install Postfix

1. Install Postfix with the below command  
      
    `yum install postfix`
2. Make postfix as default MTA for your system using the following command  
      
    `alternatives --set mta /usr/sbin/postfix`

<p class="callout info">Use the command below, if the above command does not work  
  
`alternatives --set mta /usr/sbin/sendmail.postfix`</p>

#### Start and Enable Postfix

1. With the below commands, start and enable Postfix

```
Start Postfix
=============

service postfix start

Enable Postfix
==============

chkconfig postfix on
```

#### Open Firewall Port

1. Open the firewall with the below commands to allow Postfix to communicate

```
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT
iptables -A INPUT -m state --state NEW -m udp -p udp --dport 25 -j ACCEPT
```

# Install PHP

### Installing PHP

#### Installing Repositories

1. If not already installed, install the EPEL repository with the command below  
      
    `yum install epel-release`
2. Install the Remi repository to get the latest versions of PHP with the command below  
      
    `yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm`
3. If not already installed, install yum-utils  
      
    `If not already installed, install`
4. Use yum-config-manager (a utility provided by yum-utils), to Remi repository as the default repository for installing PHP, \[xx\] represents the version of PHP  
      
    `yum-config-manager --enable remi-php[xx]`

#### Installing PHP

1. Install PHP with the command below with the default set of "add-ons" used by most PHP applications

```
yum install php php-mcrypt php-cli php-gd php-curl php-mysql php-ldap php-zip php-fileinfo
```

# Install Apache

#### Installing Apache Web Server

1. Run the commands below to install Apache web server

```
Installing Apache Web server
============================

yum install httpd

Install SSL module for Apache Web server
========================================

yum install mod_ssl
```

#### Disable HTTP\_PROXY

1. To prevent an attack through the HTTP\_PROXY vulnerability, disable HTTP\_PROXY header in apache globally

```
echo "RequestHeader unset Proxy early" >> /etc/httpd/conf/httpd.conf
```

#### Start And Enable Apache Web Server

1. To start and enable Apache Web Server use the commands below

```
Start Apache Web Server
=======================

service httpd start

Enable Apache Web Server
========================

chkconfig httpd on
```

# Install Let’s Encrypt

### Installing Let’s Encrypt on the web server

1. Ensure that the CentOS EPEL repository is installed  
      
    `yum install epel-release`
2. Install Let's Encrypt with the command below

```
yum install certbot python2-certbot-apache mod_ssl
```

<p class="callout info">To allow the installation to finish, accept the GPG key by typing `y` and pressing `ENTER` when prompted to do so</p>