Installation on GNU/Linux

Installation on Ubuntu 16.04 LTS

Considerations:

PHP version 7.0, maybe in your installation is different and updated version.
PHP-FPM is running under the username www-data.
PHP-FPM is listening on a Unix socket on unix:/run/php/php7.0-fpm.sock.
Nginx is running under the username www-data.
You don't have any other web server installed.
This is a basic configuration, consider reading more before using this in production environments.

Install Nginx Webserver, PHP, and some tools.

$ sudo apt install -y nginx php-fpm php-dom php-mbstring php-cli php-gd php-opcache unzip

Configure Nginx.

$ sudo rm -f /etc/nginx/sites-enabled/*

Add a new file with the virtual server block in /etc/nginx/conf.d/bludit.conf.

server {
    listen 80;
    server_name _;
    root /www/bludit;
    index index.php;

    location ~ \.php$ {
        fastcgi_pass    unix:/run/php/php7.0-fpm.sock;
        include         fastcgi.conf;
    }

    location / {
        try_files $uri $uri/ /index.php?$args;
    }
}

Download the latest version of Bludit and uncompress it.

$ mkdir /www
$ cd /www
$ curl https://www.bludit.com/releases/bludit-latest.zip --output bludit-latest.zip
$ unzip bludit-latest.zip
$ sudo chown -R www-data:www-data /www

Restart the services to load the new configuration.

$ sudo service php7.0-fpm restart
$ sudo service nginx restart

Open your browser and navigate to http://localhost to complete the installation.

Installation on Centos 7 / Red Hat 7

Considerations:

PHP-FPM is running under the username nginx.
PHP-FPM is listen on a Unix socket on unix:/run/php/php-fpm.sock.
Nginx is running under the username nginx.
You don't have any other web server installed.
This is a basic configuration, consider reading more before using this in production environments.

Install EPEL repository

$ sudo yum install -y epel-release