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 just a regular interface over a VLAN tagged bond and the below procedure describes how to do it on CentOS 7 / RHEL 7 in few easy steps.
Read More
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 which facilitates combining multiple network interfaces (like ens1f0, ens1f1) into aggregated links named Bonds to provide network redundancy, link failover and increased throughput.
VLAN tagging (802.1q) helps us to distinguish particular VLANs from network trunk (VLANs range) coming from the switch. It’s very helpful Linux kernel module, which enables us to connect to the multiple networks, if the server has less NICs than networks.
Read More
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.
Read More
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 as SMTP smart host (relay host) using SASL authentication to send out mail further to the OVH mail server.
Read More
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.
Read More
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 production HTTP server for free, using well known and proven technologies like Apache server, MariaDB/Galera cluster software and HAProxy load balancer.
Read More