After a fresh Debian or CentOS install, please execute your system update ("yum -y update" for CentOS7 and "apt-get -y update" for Debian7) :

CentOS 7:

wget http://prdownloads.sourceforge.net/webadmin/webmin-1.730-1.noarch.rpm
rpm -U webmin-1.730-1.noarch.rpm

Debian :

wget http://prdownloads.sourceforge.net/webadmin/webmin_1.730_all.deb
dpkg --install webmin_1.730_all.deb

You should be able to login to Webmin on "https://localhost:10000"

#Install MySQL :

yum -y install mariadb-server mariadb

#Starts the service

systemctl start mariadb.service

#Enable service startup at boot

systemctl enable mariadb.service

#Set the password for you MySQL / MariaDB install :

mysql_secure_installation

#Install Apache :

yum -y install httpd

#Start the Apace service

systemctl start httpd.service

#Enable the Apache service at boot

systemctl enable httpd.service

#Firewall Management

#Add HTTP port 80 port to firewall

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

#Add HTTPS 443 port to firewall

firewall-cmd --permanent --zone=public --add-service=https

#Add Mysql 3306 port to firewall - In case you are behind a NAT only - Not mandatory !!!

#firewall-cmd --permanent --zone=public --add-port=3306/tcp

#Add FTP Service on ports 20 and 21 to firewall rule

firewall-cmd --permanent --zone=public --add-service=ftp

#Add Webmin port 10000 to firewall

firewall-cmd --permanent --zone=public --add-port=10000/tcp

#Reloads firewall config

firewall-cmd --reload

#Install Mysql, PHP5, Apache, phpMyAdmin :

apt-get -y install apache2 php5 mysql-server libapache2-mod-php5 php5-mysql phpmyadmin php-pear

#Enable PHP5 mod for Apache :

a2enmod php5

#MySQL configuration

mysql_secure_installation

#Firewall Management
#Add HTTP port 80 port to firewall

iptables -A INPUT -i eth0 -p tcp --destination-port 80 -j ACCEPT

#Add HTTPS 443 port to firewall

iptables -A INPUT -i eth0 -p tcp --destination-port 443 -j ACCEPT

#Add Mysql 3306 port to firewall - In case you are behind a NAT only - Not mandatory !!!

iptables -A INPUT -i eth0 -p tcp --destination-port 3306 -j ACCEPT

#Add Webmin port 10000 to firewall

iptables -A INPUT -i eth0 -p tcp --destination-port 10000 -j ACCEPT

#Saves firewall config

iptables-save

This part is not mandatory and you must do it if and only if know what you are doing.
Goal : allow phpMyAdmin to access the MySQL database of your FTP Server from your Web Server.

In this situation, you have 3 hosts :
- 192.168.1.2 => webserver (port 80) - Linux
- 192.168.1.3 => your NAS (Synology, Thecus or anything with mass redundant storage and NFS protocol embedded) - Linux
- 192.168.1.4 => ftpserver (port 20 and 21) - Linux

Because you only need to manage the database of your ftpserver, you don't need a new phpMyAdmin install.

Here is how you can do this.

On your webserver :

#Edit your the know hosts file

vi /etc/hosts

#Record your /etc/hosts file when it looks like this :

127.0.0.1   webserver localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         webserver localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.3     nas
192.168.1.4     ftpserver

In most cases, phpMyadmin is installed on "/var/www/html/pma" or "/var/www/html/phpmyadmin/".

#Edit the config of your webserver :

vi /var/www/html/phpmyadmin/config.inc.php

#Find the section that begings with the Authentication type and add yours with cookie auth :

/* Second Server */

$i++;
/* Authentication type */
$cfg['Servers'][$i]['auth_type'] = 'cookie';
/* Server parameters */
$cfg['Servers'][$i]['host'] = 'ftpserver';//use the name of the ftpserver defined in /etc/hosts
//$cfg['Servers'][$i]['user'] = '';
//$cfg['Servers'][$i]['password'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['compress'] = false;
/* Select mysql if your server does not have mysqli */
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['AllowNoPassword'] = false;

Once you've defined that, you need to allow MySQL to be managed from a remote host.
#On your ftpserver, launch MySQL and execute the following commands :
 

#From ftpserver shell :

mysql -u root -p
[type in your root password]
USE mysql;

#Show the current user list :

SELECT Host, User, Password FROM user;

#Create a root (or other admin) user with all Hosts (%), then check it's working

CREATE USER 'root'@'%' IDENTIFIED BY 'MySecurePassword';

#Apply the privileges to the new root@% user :

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;

#Check the user list :

SELECT Host, User, Password FROM user;
exit;

Now, you should be able to :
- see your ftpserver host in the list of servers available through your phpMyAdmin hosted on webserver.
- access your ftpserver MySQL database through it

Source : http://www.cyberciti.biz/faq/installing-rhel-epel-repo-on-centos-redhat-...

Goal : ease the install of commonly used software such as "htop" (and many others) when playing with yum

EPEL stands for : Extra Packages for Entreprise Linux

#Just tell yum he can use the EPEL repository.

yum install epel-release

Goal : chose and install the FTP server

- FTP Server compatible with Debian 7 or CentOS 7 (might also be available for lower versions)
- FTP Mysql user and group accounts
- Web management interface (WebUI) for user, group, config, log management

I need to define a dedicated directory for all my customers, so that they can upload their files over my platefrom.
I need an "admin" user that has access to the root directory and can browse the other directories.
I need every users to be able to upload their files in their own directory ie. users must be chrooted.
I need to be able to create users and groups under Mysql with the Web management interface.
I need to be able to consult logs over the Web management interface.
I need a protected Web management interface.
I need to be able to activate / deactivate any user.
I need to be able to add some notes to each FTP account (email, company, telephone).

My choice went to pure-ftpd beause it's robust, and more easily configurable thatn proftpd.
Also the pure-ftpd web interfaces are more up to date that proftpd.

#Install pureftpd server from : http://www.pureftpd.org/project/pure-ftpd/download

yum -y install mysql-devel
wget ftp://ftp.pureftpd.org/pub/pure-ftpd/releases/pure-ftpd-1.0.39.tar.gz
tar -xzvf pure-ftpd-1.0.39.tar.gz
cd pure-ftpd-1.0.39/

./configure --with-mysql --with-virtualchroot --with-quotas --with-welcomemsg --with-ftpwho
make install-strip

Et voila! The software is now installed in /usr/local/sbin/pure-ftpd

#Add FTP Group and FTP User :
Source : https://pure-ftpd-webui.org/wiki/Pure-FTPd%2BMySQL%20installation#CentOS

groupadd -g 2001 ftpgroup
useradd -u 2001 -s /bin/false -d /bin/null -c "pureftpd user" -g ftpgroup ftpuser
cd /etc/
mkdir pure-ftpd

#Create the MySQL Database and its user access :

mysql -u root -p
SHOW DATABASES;
CREATE DATABASE IF NOT EXISTS pureftpd;
-- CHANGE PASSWORD !!!
CREATE USER 'pureftpd'@'localhost' IDENTIFIED BY 'pureftpdpass';
GRANT ALL PRIVILEGES ON pureftpd.* TO 'pureftpd'@'localhost';
FLUSH PRIVILEGES;
SHOW DATABASES;
quit;

#Install the PureFTPD WebUI

Source : https://github.com/mazay/pure-ftpd-webui ZIP : https://github.com/mazay/pure-ftpd-webui/archive/master.zip

wget https://github.com/mazay/pure-ftpd-webui/archive/master.zip
mv master.zip pure-ftpd-webui.zip
unzip pure-ftpd-webui.zip
cd pure-ftpd-webui-master
cd INSTALL
mysql -u root -p pureftpd < pure-ftpd-webui_users-table_0.0.9.sql
mysql -u root -p pureftpd < pure-ftpd-webui_users-table_0.1.1.sql

#Add the main pure-ftpd configuration file :

echo "
############################################################
#                                                          #
#         Configuration file for pure-ftpd wrappers        #
#                                                          #
############################################################

ChrootEveryone              yes
BrokenClientsCompatibility  no
MaxClientsNumber            50
Daemonize                   yes
MaxClientsPerIP             8
VerboseLog                  yes
DisplayDotFiles             no
AnonymousOnly               no
NoAnonymous                 yes
SyslogFacility              ftp
FortunesFile              /etc/pure-ftpd/cookie
DontResolve                 yes
MaxIdleTime                 15
# LDAPConfigFile                /etc/pureftpd-ldap.conf
MySQLConfigFile               /etc/pure-ftpd/mysql.conf
# PGSQLConfigFile               /etc/pureftpd-pgsql.conf
# PureDB                        /etc/pureftpd.pdb
# ExtAuth                       /var/run/ftpd.sock
# PAMAuthentication             yes
# UnixAuthentication            yes
LimitRecursion              10000 8
AnonymousCanCreateDirs      no
# MaxLoad                     4
# PassivePortRange          30000 50000
# ForcePassiveIP                192.168.0.1
# AnonymousRatio                1 10
# UserRatio                 1 10
AntiWarez                   yes
# Bind                      127.0.0.1,21
# AnonymousBandwidth            8
# UserBandwidth             8
Umask                       133:022
# MinUID                      2001
AllowUserFXP                no
AllowAnonymousFXP           no
ProhibitDotFilesWrite       no
ProhibitDotFilesRead        no
AutoRename                  no
AnonymousCantUpload         no
# TrustedIP                  10.1.1.1
# LogPID                     yes
# AltLog                     clf:/var/log/pureftpd.log
# AltLog                     stats:/var/log/pureftpd.log
# AltLog                     w3c:/var/log/pureftpd.log
NoChmod                     yes
KeepAllFiles                yes
CreateHomeDir               yes
# Quota                       1000:10
PIDFile                     /var/run/pure-ftpd.pid
# CallUploadScript yes
# MaxDiskUsage               99
# NoRename                  yes
CustomerProof              yes
# PerUserLimits            3:20
# NoTruncate               yes
# TLS                      1
IPV4Only                 yes
# IPV6Only                 yes
FileSystemCharset       utf8
ClientCharset           cp1251" > /etc/pure-ftpd/pure-ftpd.conf

#Create the pure-ftpd-mysql.conf file :

echo "
MYSQLSocket      /var/run/mysqld/mysqld.sock
MYSQLServer     localhost
MYSQLPort       3306
MYSQLUser       pureftpd
MYSQLPassword   pureftpdpass  # CHANGE PASSWORD HERE !!!
MYSQLDatabase   pureftpd
#MYSQLCrypt md5, cleartext, crypt() or password() - md5 is VERY RECOMMENDABLE uppon cleartext
MYSQLCrypt      md5
MYSQLGetPW      SELECT Password FROM ftpd WHERE User="\L" AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MYSQLGetUID     SELECT Uid FROM ftpd WHERE User="\L" AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MYSQLGetGID     SELECT Gid FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MYSQLGetDir     SELECT Dir FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MySQLGetBandwidthUL SELECT ULBandwidth FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MySQLGetBandwidthDL SELECT DLBandwidth FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MySQLGetQTASZ   SELECT QuotaSize FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")
MySQLGetQTAFS   SELECT QuotaFiles FROM ftpd WHERE User="\L"AND status="1" AND (ipaccess = "*" OR ipaccess LIKE "\R")" > /etc/pure-ftpd/mysql.conf

#Start Apache and MySQL (MariaDB)

systemctl restart mariadb
systemctl restart httpd

#Begin the installation of the WebUI files

Source : https://pure-ftpd-webui.org/wiki/Pure-FTPd%20WebUI%20installation#CentOS:
You have already build FTP table (ftpd) and it's admin user (userlist)
You can watch the tables by sending the SQL command : "SHOW TABLES;" if needed
Now we want to add the main admin user of the Admin Panel :

#Connect to MySQL :
mysql -u root -p
USE pureftpd;
#Insert the new admin user with a strong password :
INSERT INTO userlist (user,pass) VALUES ('admin', MD5('adminpass please change me'));
quit;

#Copy the pureftpd-web-ui files into the right directory and manage security

mv /root/soft/pure-ftpd-webui-master /var/www/html/pure-ftpd-webui
chown ftpuser.ftpgroup -R /var/www/html/pure-ftpd-webui
chmod -R 0755 /var/www/html/pure-ftpd-webui

#Add Apache Alias for pureftpd WebUI

echo "Alias /pure-ftpd-webui /var/www/html/pure-ftpd-webui

<Directory /var/www/html/pure-ftpd-webui>
    Options +FollowSymLinks
    AllowOverride None
    order allow,deny
    allow from all

    AddType application/x-httpd-php .php

    <IfModule mod_php5.c>
        php_flag magic_quotes_gpc On
        php_flag short_open_tag On
        php_flag register_globals On
        php_flag register_argc_argv On
        php_flag track_vars On
        # this setting is necessary for some locales
        php_value mbstring.func_overload 0
        php_value include_path .
    </IfModule>

    DirectoryIndex index.php
</Directory>" > /etc/httpd/conf.d/pure-ftpd-webui.conf

#Disable SELinux

vi /etc/sysconfig/selinux
#Set the line begining by SELINUX to "SELINUX=disabled"
#Save the file
#I recommend you restart your machine :
reboot
#You can also leave the machine running by Disabling temporarly SELinux :
setenforce 0

#Restart Apache

systemctl restart httpd

#Open your web browser to test :

Change the IP to match YOUR configuration... http://192.168.1.4/pure-ftpd-webui/install.php

When you hit the install URL : http://192.168.1.4/pure-ftpd-webui/install.php

#You will need to change the access to the config file :

chmod 777 /var/www/html/pure-ftpd-webui/config.php

#You need to enter the right MySQL and user credentials.

It should look like this :

MySQL host : localhost
MySQL admin login : pureftpd
MySQL admin password : USE THE PASSWORD YOU DEFINED for the "pureftpd" MysqL user
MySQL database : pureftpd

Pure-ftpd-webui user : admin
Pure-ftpd-webui password : USE THE PASSWORD YOU DEFINED for the "admin" Pure-ftpd-webui user

Then, click Next button (bottom right)

# Add the address of the FTPWHO script to the pureftpd-webui application :

/usr/local/sbin/pure-ftpwho