Firewalld Zone Order/Priority And How To Restrict all but one address

This article shows how firewalld priorities rules and zones. The priority of zones is in alphabetical order. So the "block" ...
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Custom IAM Policy For EC2 Snapshots

There are two issues with creating EC2 snapshots on a schedule. First the AWS recommended way doesn't allow for custom ...
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IPSec/L2TP VPN on AWS EC2 | Security Group Settings

This article notes the AWS EC2 Security Group that should be associated with an EC2 to permit a roaming VPN ...
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Hardening SSH Server on CentOS or RHEL 6 & 7

This article is a quick note on how to improve OpenSSH server security on Redhat Enterprise Linux and CentOS 6 ...
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Red Hat Enterprise Linux 8 on VirtualBox

This article focuses on installing and running RHEL8 (Red Hat Enterprise Linux 8) on VirtualBo. Specifically, this article demonstrates how ...
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Minimal Transparent Squid Proxy with SSL Interception/Bumping on CentOS 7

This article is the minimal configuration for a Squid transparent proxy with SSL Interception (or bump). We're using CentoOS 7 ...
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Zabbix Dealing with Cannot create semaphore set No space left on device

If you get this strange error when trying to start the Zabbix agent on a CentOS 7 or similar system, ...
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Install FreeIPA on CentOS 7 For LDAP and Kerberos Services

If you need a quick LDAP and Kerberos system up and running to provide authentication and user information, FreeIPA is ...
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How to Configure AutoFS on RHEL/CentOS 7 | RHCSA

This article shows how to configure a Redhat/CentOS 7 workstation to access a remote storage system using both NFS and ...
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Remove Adverts from vTigerCRM (2019)

vTigerCRM is an excellent opensource (free to use) CRM that I use. However, it does have a small advert to ...
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Automatically Block Intruders With pfSense

High-end firewall appliances such as those from Watchguard offer the facility to automatically block remote systems based on their behavior ...
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Install the Zabbix Agent & Enable TLS & PSK on CentOS and RHEL (2019)

This article demonstrates how to ensure hosts authenticate before communicating with the Zabbix server and that communications use TLS. TIP: ...
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Install OpenVAS on CentOS (2019)

This article explains how to install OpenVAS on CentOS 7. My earlier attempts to document the installation process of OpenVAS ...
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How to Add a Disk to a KVM Virtual Machine

This article demonstrates how to add and remove a disk from a virtual machine running in KVM. We're using CentOS ...
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How to Create & Work With LVM RAID on CentOS 7 | A Working Example

We have a server with a bunch of hard disks that need to be combined to create one large filesystem ...
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Business Continuity Planning for Transactional Businesses

Business Continuity Planning is critical for transactional businesses more-so than non-transactional businesses. What do I mean by "transactional"? If you ...
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An AWS IAM Custom Policy To Allow EC2 Snapshots

This article shows how to create a custom AWS IAM policy to allow snapshots. The first code snippet is what ...
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Solution to the “abrt-cli status timed out” problem

This article will help you if you're receiving any of the following error messages. The short answer is that you ...
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