To change the date or time you can use the touch command as with the following example: The switches are as follows: -a = accessed date and time -m = modified date and time -t = timestamp – use YYYYMMDDhhmm[.ss] time format To verify they are all the same, use…
Finding the new Disk Once the new physical or virtual hard drive has been installed on the system and is visible to the operating system. Once added, the new drive should automatically be detected by the operating system. Typically, the disk drives in a system are assigned device names beginning…
This post will walk you through setting up DKIM with Postfix on your Ubuntu 18.04 or 20.04 Server. Setting up DKIM First, install OpenDKIM which is an open-source implementation of the DKIM sender authentication system. Then add postfix user to opendkim group. Edit OpenDKIM main configuration file. Uncomment the following lines. Replace simple with relaxed/simple. Then add…
I recently came across an issue on an Ubuntu 20.04 installation recently when I setup Postfix using a smart relay with authentication. But when mails were sent, the following error was being recorded: I did some research and found I needed to install the libsas12-modules. I though I would share…
Iptables is the software firewall that is included with most Linux distributions by default. This post guide provides a quick reference to iptables commands that will create firewall rules for everyday scenarios. Allow Loopback Connections The loopback interface, also referred to as lo, is what a computer uses to forward network connections to…
Iptables is a firewall that plays an essential role in network security for most Linux systems. This post will focus on listing and deleting rules in Iptables. In this post, I will cover how to do the following iptables tasks: Listing Rules by Specification To list out all of the…
Redis is an open-source key value store that can operate as both an in-memory store and as cache. Redis is a data structure server that can be used as a database server on its own, or paired with a relational database like MySQL to speed things up. The first time…
Below are some useful commands to manage users in MySQL: Create Database The following command will create a new database Delete / Drop Database The following command will create a new database List Databases Run the following command to show a list of all databases
PHP-FPM uses a daemon to manage the multiple PHP versions on a single server. Together we can use Apache and PHP-FPM to host multiple PHP web sites, each using a different versions of PHP at the same time. This is useful because different applications may require different versions of PHP. HP-FPM…
If you ever find that you need to send out email from your server via a relay, as you cannot send them out directly from your server’s IP (eg its been black listed). Relaying the mail via Mailgun is a good option. To do this you will need to setup…