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Category: Bash

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

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

Create tenant in OpenStack Newton using command line interface

December 28, 2016March 3, 2017 No Comments

OpenStack comes out of the box with it’s dashboard called Horizon. Horizon provides GUI, which let us manage our OpenStack environment in pretty easy and inuitive way. However basic tasks, like tenant creation or instance commissioning, can be time consuming […]

Grzegorz Juszczak Bash, Cloud Computing

Mount | Modify | Edit | Repack | Create UEFI ISO with Kickstart File inside

September 11, 2016December 8, 2016 7 Comments

Linux installation process can be simplified by means of Kickstart Installation method, used in Linux distributions like: Red Hat, Debian, Fedora, CentOS, Ubuntu. This method utilizes so called Kickstart File, which describes the configuration, required setup and post installation tasks […]

Grzegorz Juszczak Bash, Linux

Create USB Boot Disk in Linux using dd command

August 28, 2016September 12, 2016 No Comments

Have you ever tried to quickly create USB Boot Disk in Linux and had no dedicated software to create one? For a long time Linux distributions have come with basic tools like dd utility out of the box. dd command […]

Grzegorz Juszczak Bash, Linux

Linux cp mv overwrite without prompt (disable interactive mode)

May 10, 2016May 10, 2016 1 Comment

Some Linux distributions (for example: RedHat) have aliases configured in the system, especially for root user, which modify basic command line operations like: cp, mv by adding “-i” parameter to prevent user from accidental overwriting or deleting files (interactive mode). […]

Grzegorz Juszczak Bash, Linux

ifdata – network interface information tool – ifconfig alternative

December 28, 2015December 28, 2015 No Comments

ifdata is a quick, lightweight and simple tool to display network interface information in Linux, which can be used as an alternative for ip addr show or ifconfig. Sometimes I want to quickly find out, if the particular network interface […]

Grzegorz Juszczak Bash, Linux

OpenStack Command-Line Interface Cheat Sheet

December 5, 2015February 29, 2016 1 Comment

Openstack, besides Horizon GUI Dashboard, can also be configured via command-line interface using commands in Bash. Below we present a list of common and useful commands for your reference. Note: in OpenStack command-line interface you have to source appropriate keystonerc […]

Grzegorz Juszczak Bash, Cloud Computing

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