At last change the setting in Google Account to allow less secured non-Google apps to use authentication to send emails via SMTP on your behalf.

Changing the Hostname on Ubuntu Server

Before we configure Postfix MTA, let’s adjust our hostname to reflect the correct domain name in our outgoing internal email.

Setting up a hostname is really important if you’re using a custom domain for emailing. The hostname helps in proper mailing address.

One of the easiest and reliable solutions that I recommend is using G Suite to have a business email address, for example: team@restorebin.com. You can also get a 20% discount on sign up using this G Suite coupon code.

About Hostname, you can check your current hostname using the below command line in SSH:

hostname -f

The hostname command can also be used for changing the Ubuntu Server hostname throughout.

hostname example.com

I will be changing the hostname to demo.restorebin.com using below command. Continue reading →

Start by updating your system packages to the latest version:

sudo apt update
sudo apt -y upgrade

Reboot system after doing an upgrade

sudo reboot

Once the system is up, begin the installation FreeRADIUS and Daloradius on your Ubuntu 18.04 / Ubuntu 16.04 system.

Step 1: Install Apache Web Server and PHP

Daloradius will require php and Apache web server to be installed on the host system.

Installing Apache on Ubuntu:

Install Apache web server by running: Continue reading →

The cp command is a Linux command for copying files and directories. The syntax is as follows:

cp source destination
cp dir1 dir2
cp -option  source destination
cp -option1 -option2  source destination

Linux cp command examples

Continue reading →

Remember that you can check your current UFW ruleset with sudo ufw status or sudo ufw status verbose.

Block an IP Address

To block all network connections that originate from a specific IP address, 15.15.15.51 for example, run this command:

• sudo ufw deny from 15.15.15.51

Continue reading →

Before you remove your MySQL installation, try running the following command from the CLI.

mysql_secure_installation

If a password hasn’t been set for root (for MySQL), that’ll prompt you to set a password and run you through a series of steps to help clean up and secure MySQL (basic security).

Once set, then try running the command below to restart MySQL and see if you receive an error. Continue reading →

Introduction

One of the first lines of defense in securing your cloud server is a functioning firewall. In the past, this was often done through complicated and arcane utilities. There is a lot of functionality built into these utilities, iptables being the most popular nowadays, but they require a decent effort on behalf of the user to learn and understand them. Firewall rules are not something you want yourself second-guessing.

To this end, UFW is a considerably easier-to-use alternative.

What is UFW?

UFW, or Uncomplicated Firewall, is a front-end to iptables. Its main goal is to make managing your firewall drop-dead simple and to provide an easy-to-use interface. It’s well-supported and popular in the Linux community—even installed by default in a lot of distros. As such, it’s a great way to get started securing your sever.

Before We Get Started

First, obviously, you want to make sure UFW is installed. It should be installed by default in Ubuntu, but if for some reason it’s not, you can install the package using aptitude or apt-get using the following commands:

sudo aptitude install ufw

or

sudo apt-get install ufw

Continue reading →