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…
While I fully understand the security implications of running these legacy and unsupported versions of PHP and MySQL. I had an application that had these dependancies, but I wanted to move to a supported LTS version of Ubuntu. Once you have Ubuntu 18.04 installed with Apache 2, you can use…
One common configuration issue with Nagios 3 running on Ubuntu is getting the Service Commands menu to work correctly in the web portal. By default, it is visible in the UI, but disabled on the server backend. In Ubuntu, you will recieve the cryptic error Could not stat() command file pointing to /var/lib/nagios3/rw/nagios.cmd. This can…
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…
Powershell is now the defacto scripting language in Windows environments. Microsoft have now decreed to all of it’s software units that they must create PowerShell cmdlet’s with full functionality to the software in all future releases. To run Powershell scripts from the Windows Task Scheduler, follow the steps below: 1) Open…
Address rewriting allows changing outgoing email ID or domain name itself. This is good for hiding internal user names. For example:SMTP user: user-01EMAIL ID: [email protected] name: server.domain.com However when user-01 send an email from shell prompt or using php it looks like it was send from [email protected] Postfix MTA offers smtp_generic_maps parameter….