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…
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: List rules Delete rules Listing Rules by Specification To list…
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…
There is a known error when your Nagios Monitoring Server is running Ubuntu 16.04 and you are trying to monitor a server with a newer version of Ubuntu like Ubuntu 18.04. In Ubuntu 18.04, NRPE uses a 2048 bit DH key, but in earlier versions of NRPE use a 512…
I had an issue today where a Linux VM’s file system was read only after a SAN issue. When a Linux server like Ubuntu looses access to its disks, the file system can go into read only to protect it from corruption. To resolve this you will need to run the following command:…
While generating a PDF from a dynamically created HTML file, I found that the PDF generation failed as there were non UTF-8 characters in the HTML file. To try and find these characters, I used the strings command with the -n 8 switch to remove any non UTF characters: I was…
UFW a firewall configuration tool available on Ubuntu. UFW provides a user friendly way to create an IPv4 and IPv6 ip/port based firewall rules. By default UFW is disabled, it can be enabled by running the following. Please ensure you have firewall rules in place to allow SSH before you enable…