Install OnlyOffice Document Server on Ubuntu 16

Step 1: Install ONLYOFFICE Document Server

Please note that OnlyOffice document server requires at least 2GB of RAM. An additional 2GB of swap space is recommended. OnlyOffice document server depends on PostgreSQL, Node.js, Redis Server, RabbitMQ server and Nginx. The following steps are tested on a Ubuntu 16.04 server but should also be applicable to other Debian-based Linux distributions.

Install PostgreSQL from Ubuntu repository

sudo apt install postgresql

Then create the onlyoffice database.

sudo -u postgres psql -c "CREATE DATABASE onlyoffice;"

Create the onlyoffice user.

sudo -u postgres psql -c "CREATE USER onlyoffice WITH password 'onlyoffice';"

Grant permission. Continue reading “Install OnlyOffice Document Server on Ubuntu 16” »


Apache error fix on Forbidden You don’t have permission to access this resource

Tested and works on Debian/Ubuntu apache installation. For this open the apache2.conf file using the nano editor

sudo nano /etc/apache2/apache2.conf

Replace the general directory settings with this.

<Directory />
#Options FollowSymLinks
Options Indexes FollowSymLinks Includes ExecCGI
AllowOverride All
Order deny,allow
Require all granted
</Directory><Directory /usr/share>
AllowOverride None
Require all granted
</Directory><Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
#<Directory /srv/>
# Options Indexes FollowSymLinks
# AllowOverride None
# Require all granted

Ensure your virtual host configuration file in /etc/apache2/sites-available directory is in this manner Continue reading “Apache error fix on Forbidden You don’t have permission to access this resource” »


Install Redis on Ubuntu 18.04 & 16.04 LTS

Step 1 – Prerequsities

Log in to your system with sudo privilege account using shell access, to which you need to install Redis.

ssh ubuntu@remote

Update the apt-get packages index files and also update existing packages to the newest versions by using the following commands:

sudo apt-get update
sudo apt-get upgrade

Step 2 – Installing Redis

The Redis packages are available under the default apt repository. For the installation of Redis on an Ubuntu VPS. Run below command from the terminal to install Redis on your machine:

sudo apt-get install redis-server

Next is to enable Redis to start on system boot. Also restart Redis service once.

sudo systemctl enable redis-server.service

Continue reading “Install Redis on Ubuntu 18.04 & 16.04 LTS” »


Ubuntu Server 18.04 LVM out of space with improper default partitioning

Problem Statement:

I installed Ubuntu Server 18.04 with the LVM option and left the default partition setup. Now my main drive only has 4GB in a 1TB hard drive. How can I fix this without starting from scratch?

Results of df -h :

Filesystem Size Used Available Use% Mounted on
udev 16G 0 16G 0% /dev
tmpfs 32G 1.7M 32G 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 3.9G 3.6G 92M 98% / 
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/loop0 87M 87M 0 100% /snap/core/4917
/dev/loop1 3.2M 3.2M 0 100% /snap/stress-ng/471
/dev/loop2 90M 90M 0 100% /snap/core/6130
/dev/sda2 976M 143M 766M 16% /boot
tmpfs 3.2G 0 3.2G 0% /run/user/1000

Resolution: Continue reading “Ubuntu Server 18.04 LVM out of space with improper default partitioning” »


Reinstall VirtualBox on Ubuntu & CentOS

For Ubuntu

To remove virtualbox

sudo dpkg --list virtualbox-*
sudo apt autoremove --purge virtualbox*
dpkg -l virtualbox* | grep ^i

Remove all PPAs from sources.list and source.list.d directory

mkdir ~/apt-tmp
sudo mv /etc/apt/sources.list.d/* ~/apt-tmp

Make sure there is nothing except official repositories sources in /etc/sources.list. And update your sources:

sudo apt update

Now we can search to see which versions are available to install:

apt-cache madison virtualbox | grep -iv sources

Which produces an output like this:

virtualbox | 5.0.32-dfsg-0ubuntu1.16.04.2 | xenial-updates/multiverse amd64 Packages
virtualbox | 5.0.18-dfsg-2build1 | xenial/multiverse amd64 Packages

Then I would install the last version mentioned in xenial-updates: Continue reading “Reinstall VirtualBox on Ubuntu & CentOS” »


Install Zoneminder on Ubuntu 18.04 with shell script

This will install Zoneminder by using a shell script with one basic command (how easy is that!).

You will need a Ubuntu 18.04 install with LAMP (Apache, MySQL and PHP) installed desktop or server. As an alternate you may use Mariadb in lieu of MySQL

Shell script file contents:

read -p "This script installs Zoneminder 1.32.x on Ubuntu 18.04 AMD64 with LAMP (MySQL) installed...
Press Enter to continue or Ctrl + c to quit" nothing
read -p "You must be logged in as root using sudo su ...
Press Enter to continue or Ctrl + c to quit" nothing
read -p "Next we will add the PPA repository, install and configure the system to run Zoneminder. 
Press enter to continue" nothing
apt install -y software-properties-common
add-apt-repository ppa:iconnor/zoneminder-1.32
apt update
awk '$0="date.timezone = "$0' /etc/timezone >> /etc/php/7.2/apache2/php.ini
apt install -y zoneminder
systemctl enable zoneminder
service zoneminder start
adduser www-data video
a2enconf zoneminder
a2enmod rewrite
chown -R www-data:www-data /usr/share/zoneminder/
service apache2 reload
read -p "Install complete.Press enter to continue" nothing

Copy the contents of the script, open a terminal and run: Continue reading “Install Zoneminder on Ubuntu 18.04 with shell script” »


How to Install and Configure GitLab on Ubuntu 16.04

GitLab is an open source GIT repository manager based on Rails and developed by GitLab Inc. It is a web-based GIT repository manager that allows your team to work on code, track bugs and feature requests and to test and deploy applications. GitLab provides features like a wiki, issue tracking, code reviews, activity feeds and merge management. It is capable of hosting multiple projects.

GitLab is available in four editions:

  • Gitlab CE (Community Edition) – self-hosted, free and support from the Community forum.
  • Gitlab EE (Enterprise Edition) – self-hosted, paid app, comes with additional features.
  • – SaaS, free.
  • – Private GitLab instance managed by GitLab Inc.

In this tutorial, I will show you step-by-step how to install GitLab CE (Community Edition) on your own Ubuntu 16.04 Xenial Xerus server. In this tutorial, I will be using the ‘omnibus’ package provided by GitLab for easy installation.

What we will do:

  • Install Packages
  • Install GitLab
  • Configure GitLab URL
  • Generate SSL Let’s encrypt and DHPARAM Certificate
  • Enable Nginx HTTPS for GitLab
  • Configure UFW Firewall
  • Perform the GitLab Installation
  • Testing


  • Ubuntu 16.04 Server – 64bit
  • Min RAM 2GB
  • Root Privileges

Step 1 – Install required Ubuntu Packages
The first step is to install the packages needed for the GitLab installation. Please log in to the server as root user and upddate the Ubuntu repository.

ssh root@GitLabServer
apt-get update

Now install the packages including curl for downloading the GitLab repository, ca-certificates, and postfix for the SMTP configuration. Install all packages with the apt command below.

sudo apt install curl openssh-server ca-certificates postfix

During postfix installation, you will be prompted about the configuration, select ‘Internet Site’. and then enter the server domain name that shall be used for sending an email. Continue reading “How to Install and Configure GitLab on Ubuntu 16.04” »


How to Change Hostname on Ubuntu 18.04

Display the Current Hostname

To view the current hostname, enter the following command:


As you can see in the image above, the current hostname is set to ubuntu1804.localdomain.

Change the Hostname

The following steps outline how to change the hostname in Ubuntu 18.04.

1. Change the hostname using hostnamectl

In Ubuntu 18.04 we can change the system hostname and related settings using the command hostnamectl.

For example, to change the system static hostname to linuxize, you would use the following command: Continue reading “How to Change Hostname on Ubuntu 18.04” »


SOLVED Zimbra 8.6 HTTP ERROR 404 Problem accessing /public/error.jsp. Reason: /public/error.jsp

Do a quick search under the usual jetty folders:

find /opt/zimbra/jetty/ -type f -name *jsp -mtime -30

If you find files like:


you’re actually hacked.

Unlike the previous “zmcat” and “dblaunchs” that actually exploit the vuln and load some sh*t this looks like a bad childish attack. It seems that they delete some files under jetty dir, don’t know why. 
The attack vector is the same, but, there are no strange processes, there is no persistence. Continue reading “SOLVED Zimbra 8.6 HTTP ERROR 404 Problem accessing /public/error.jsp. Reason: /public/error.jsp” »