Modifying files in Vim can be arduous and time-consuming, especially when we want to modify multiple lines at once. The typical use case is modifying a configuration file in the system when it is required to comment or uncomment multiple […]
One of the key features in OpenStack is the ability to resize Instance’s flavor to increase resource limits used by Instances, such as vCPUs and RAM. Unfortunately, in the case of Instance with Cinder-backed volume, changing flavor does not affect […]
LLDP (Link Layer Discovery Protocol) can be essential in the situations of complex network-server infrastructure configurations and it’s extremely helpful in case there is no direct access to our setup but we need to determine what network ports on the […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
