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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 2 Comments

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

High Availability Apache Galera Cluster with HAProxy Load Balancer

May 5, 2019October 21, 2019 1 Comment

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

Extending Minimum Time Between IPMI Operations in OpenStack Ironic

September 29, 2018September 30, 2018 No Comments

In TripleO based installations of OpenStack the deployment of Overcloud nodes is coordinated by so called Ironic module, which was developed in general to deploy OS on bare metal servers. There is a number of IPMI (Intelligent Platform Management Interface) […]

Grzegorz Juszczak Cloud Computing, Linux

OpenStack Pike TripleO Undercloud and Overcloud Deployment on 3 Bare Metal Servers

July 18, 2018February 24, 2019 3 Comments

Nowadays Packstack based OpenStack installations are used for proof-of-concept and demonstration purposes only. The official RDO community points TripleO (OpenStack On OpenStack) as a recommended OpenStack deployment method for production cloud. TripleO is an automated installation tool, based on Ironic […]

Grzegorz Juszczak Cloud Computing, Linux

Enable UEFI for QEMU KVM on Fedora

May 31, 2018June 2, 2018 No Comments

UEFI (Unified Extensible Firmware Interface) has become a successfull successor of an outworn and obsolete BIOS firmware. Emulating UEFI based hardware on KVM/QEMU Virtual Machine is possible thanks to so called OVMF (Open Virtual Machine Firmware), which comes from EDK2 […]

Grzegorz Juszczak Linux, Virtualization

How to configure Docker Proxy on CentOS 7, RHEL 7

May 25, 2018May 25, 2018 1 Comment

How to enable Proxy for Docker engine with or without authentication on CentOS 7, Red Hat Enterprise Linux 7?

Grzegorz Juszczak Linux, Virtualization

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