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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RDS Switch From Multi-AZ to Single-Zone

This article demonstrates how to downgrade an RDS MySQL instance from multi-availability-zone (Multi-AZ) to a single instance (single zone). The ...
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The Australian Encryption Laws – A Solution

The Australian lawmakers are passing laws that progressively take away privacy of the citizens of this country. The most recent ...
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How to Integrate Gluster and Samba4 on CentOS7 and RHEL

This article extends on a previous article focused on installing and performance testing Gluster on CentOS 7. You can see ...
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Testing Gluster 4.1.5 on CentOS 7

Gluster is an amazing Software Defined Storage (SDS) solution offered as part of the Redhat solutions portfolio. Here we push ...
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Installing Janus on Redhat Enterprise Linux

This article discusses the installation of Janus on a Redhat Enterprise Linux 7 server. The installation process is long and ...
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Easy Incremental Backups With Tar on CentOS & Redhat

Disk space may be cheep but off-site backups are often slow so daily full-backups aren't always the best option. Tar ...
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