Month: January 2020

Bash, Linux

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

Jan 18, 2020 by Grzegorz Juszczak 1 Comments , , , , , , , ,


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 to fix the failure.
In this article I would like to take a look at checkmk – a powerful monitoring software, developed by tribe29 GmbH with tons of configuration options and a user-friendly WebGUI, which can help you fully automate monitoring activities of your hardware and operating systems.
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Bash, Linux

Configure Postfix SMTP Relay (Smart Host) on CentOS 8

Jan 17, 2020 by Grzegorz Juszczak 2 Comments , , , , , , , ,

Install and Configure Postfix SMTP Smart Host on CentOS
Postfix is a Mail Transport Agent (MTA), which can be easily configured as a private relay host, passing mail to other mail servers. Unlike Sendmail, Postfix is considered a very secure MTA, offering a high level of flexibility and ease of administration.
In this article, I am configuring Postfix on CentOS 8, running on CinderCloud VPS, as SMTP smart host (relay host) using SASL authentication to send out mail further to the OVH mail server.
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Bash, Linux

Configure Sendmail MTA on CentOS 8 to work as SMTP Relay

Jan 5, 2020 by Grzegorz Juszczak 2 Comments , , , , , , , ,


Sendmail is easy to implement, 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 emails from monitoring software to deliver status notifications to the system administrators or send diagnostic information at a specified time schedule.
In this article, I present how to install and configure Sendmail on CentOS 8 to work as SMTP Relay for outbound traffic to the OVH mail server.
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