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How to add Hot Spare Volume to the existing mdadm software RAID array

December 29, 2020December 29, 2020 No Comments

Having a Hot Spare significantly increases the security of our data in a RAID array. In the case of a single disk failure, a Hot Spare jumps in the place of a faulty drive. Working as a temporary replacement, a […]

Grzegorz Juszczak Linux, Storage

Configure VLAN tagged interface over LACP bond on CentOS / RHEL

November 12, 2020December 29, 2020 No Comments

In one of my previous articles I presented how to: Configure a bridge interface over a VLAN tagged bonded interface on CentOS / RHEL This is a supplement to the above tutorial – sometimes all you need is to configure […]

Grzegorz Juszczak Linux

Configure a bridge interface over a VLAN tagged bonded interface on CentOS / RHEL

June 1, 2020November 29, 2020 No Comments

Linux enables us to create advanced network setups which provide us with special features like NIC Bonding, VLAN tagging or Bridging allowing us to increase network connectivity efficiency and reliability of Linux based hosts. Linux Bond is a kernel module […]

Grzegorz Juszczak Linux

Install and Configure Checkmk on CentOS 8 and Monitor Linux Hosts using Checkmk agent

January 18, 2020January 19, 2020 1 Comment

If you have important production servers or critical services in your network, having monitoring tools becomes a must. In case of any hardware or software failures, it is crucial to get alerted as soon as possible and take appropriate actions […]

Grzegorz Juszczak Bash, Linux

Configure Postfix SMTP Relay (Smart Host) on CentOS 8

January 17, 2020January 31, 2021 1 Comment

Postfix is a Mail Transport Agent (MTA), which can be easily configured as a private relay host, passing mail to another mail servers. Unlike Sendmail, Postfix is considered as a very secure MTA, offering a high level of flexibility and […]

Grzegorz Juszczak Bash, Linux

Configure Sendmail MTA on CentOS 8 to work as SMTP Relay

January 5, 2020January 18, 2020 1 Comment

Sendmail is an easy to implemant, lightweight electronic Mail Transport Agent (MTA), which enables you to automate the process of sending e-mail messages from your Linux host. It can play a significant role as a background mechanism for processing outbound […]

Grzegorz Juszczak Bash, Linux
Debutify Free Shopify Theme

High Availability Apache Galera Cluster with HAProxy Load Balancer

May 5, 2019October 21, 2019 No Comments

Using a high-availability LAMP (Linux Apache MySQL/MariaDB PHP) server may totally eliminate the risk of server’s downtime, which can be crucial in case of a production HTTP server, serving critical business application. We can set a redundant, fully functional, high-avalability […]

Grzegorz Juszczak Linux

Install Nextcloud with Docker on Debian 10 Buster

April 23, 2019November 26, 2019 14 Comments

Nextcloud is a lightweight, open-source StaaS (Storage as a Service) platform, written i PHP and JavaScript, which provides file sync, file sharing and creative collaboration services. The software can be installed on local hardware as a perfect alternative for commercial […]

Grzegorz Juszczak Linux, Storage, Virtualization

OpenStack Pike TripleO Overcloud Deployment using VLAN based Network Isolation

February 10, 2019February 10, 2019 9 Comments

The basic OpenStack TripleO deployment utilises the so called provisioning / control plane network for all types of traffic (internal API, tenant, storage, storage management, etc…), that run across the whole OpenStack installation. The Undercloud node, which is used for […]

Grzegorz Juszczak Cloud Computing, Linux

Kickstart Tutorial – Practical Examples for RHEL 7 / CentOS 7

February 2, 2019November 21, 2019 6 Comments

Linux installation can be performed totally unattended using Kickstart file, which contains configuration, required setup and post installation tasks to fully automate installation process without being prompted for any input details. Kickstart file can be placed in the remote repository […]

Grzegorz Juszczak Bash, Linux

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