Category Archives: Linux (Ubuntu)

How to force users to use secure passwords on Ubuntu/Debian Linux

How to force users to use secure passwords on Ubuntu/Debian Linux
My Linux shell user can modify their password using the passwd command. How can I force users to choose the secure password that will prevent users from using stupid passwords like “abc123″, “password”, “123456” and so on? How do I setup password quality requirements on my Debian or Ubuntu Linux server?
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How to install KVM on Ubuntu 16.04 LTS Headless Server

How to install KVM on Ubuntu 16.04 LTS Headless Server

Kernel-based Virtual Machine (KVM) is a virtualization module for the Linux kernel that turns it into a hypervisor. How can I install KVM with bridged networking, setup guest operating system as the back-end virtualization technology for non-graphic Ubuntu Linux 16.04 LTS server?
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How to Install nginx and google PageSpeed on Ubuntu 16.04 (Xenial Xerus)

Zabihah Halal Vitamins
How to Install nginx and google PageSpeed on Ubuntu 16.04 (Xenial Xerus)
This tutorial shows how to build a nginx .deb package for Ubuntu 16.04 from source that has Google PageSpeed module compiled in. Nginx (engine-x) is an open source and high-performance HTTP server, reverse proxy and IMAP/POP3 proxy server. The outstanding features of Nginx are stability, rich feature set, simple configuration and low resource consumption. Nginx is being used by some of the largest websites on the internet and is gaining more and more popularity in the webmaster community.

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StrongSwan based IPsec VPN using certificates and pre shared key on Ubuntu 16.04

Zabihah Halal Vitamins
StrongSwan based IPsec VPN using certificates and pre shared key on Ubuntu 16.04
In this article, the strongSwan IPsec VPN will be installed on Ubuntu 16.04 (LTS), I will show the integration of OpenSC for hardware tokens and finally the creation of a gateway-to-gateway tunnel using a pre-shared key and x.509 certificates.

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How to install Odoo ERP Software on Ubuntu 16.04

Zabihah Halal Vitamins
How to install Odoo ERP Software on Ubuntu 16.04
Odoo is an OpenSource enterprise resource planning and customer relationship software that can help you to organize and grow your business. Odoo was formerly named openERP and therefore TinyERP. There are many apps available to extend Odoo, for example: billing, accounting, manufacturing, purchasing, warehouse management, and project management.

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How to install and setup DRBD on CentOS

Zabihah Halal Vitamins
How to install and setup DRBD on CentOS
This tutorial explains how to install and setup DRBD for your server. Before I start, let me explain what actually DRBD represents and what it is used for. DRBD stands for Distributed Replicated Block Device, a software-based, shared-nothing, replicated storage solution for mirroring the content of block devices such as hard disks, partitions, logical volumes etc.

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How to configure Postfix relayhost (smarthost) to send eMail using an external smptd

How to configure Postfix relayhost (smarthost) to send eMail using an external smptd

How do I configure Postfix MTA to send eMail using an external cloud-based SMTP server (with username: password) from a web server on Linux or Unix-like system? How do I configure an Ubuntu server and postfix as the relay server (smarthost)?
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How to Install Seafile on Ubuntu 16.04 (Xenial Xerus)

Zabihah Halal Vitamins
How to Install Seafile on Ubuntu 16.04 (Xenial Xerus)
This tutorial shows the installation of Seafile on Ubuntu 16.04. Seafile is a private cloud software, it supports encrypted file libraries to store data securely. To encrypt files in a library, you need to set a password when you create the library. The password won’t be stored on Seafile cloud, so even the administrator of the servers cannot view your encrypted data without the password.

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cron Error: bad username; while reading /etc/cron.d file on Linux

cron Error: bad username; while reading /etc/cron.d file on Linux

I am getting the following error in my cron job log file /var/log/cron.log:
       Aug 22 01:59:01 server2 cron[7510]: Error: bad username; while reading /etc/cron.d/backups I have job entry as follows to run a job at 00:50 every day for root user:
       50 0 * * * /etc/cron.d/backups How do I fix this problem on Linux or Unix-like system?
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