Author: Grzegorz Juszczak

Cloud Computing

Install OpenStack Newton All In One with Heat Service on CentOS 7

Dec 11, 2016 by Grzegorz Juszczak 10 Comments , , , , , , , , ,

Install OpenStack Newton All In One with Heat Service on CentOS 7
In OpenStack all-in-one configuration all OpenStack nodes (controller node, compute node, network node) are installed on a single machine. All in one configuration can be quickly deployed for testing purposes and is often recommended for developers to test their applications on top of OpenStack environment.

In this tutorial we install OpenStack Newton release from RDO repository including Heat Orchestration service on single node (all-in-one installation) based on CentOS 7 / RHEL 7 using packstack installer script.
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Linux

Install Ansible on Fedora via DNF from RPM packages

Dec 10, 2016 by Grzegorz Juszczak 0 Comments , , , , , , ,

Install Ansible on Fedora via Yum from RPM packages
Ansible is a simple open-source automation tool that can automate cloud deployment, application deployment or Linux OS maintenance. Comparing Ansible to other automation tools (i.e. Puppet), it’s the simplest tool, because it’s agentless. Ansible once installed on a control node, connects to a managed node via SSH, which doesn’t require any client applications installed on that node.

Installation of Ansible on Fedora based control node is pretty simple and straightforward, since it can be installed from RPM packages. In this tutorial we are installing Ansible on Fedora 23 via dnf package manager.
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Linux

GRUB 2 Custom Splash Screen on RHEL 7 UEFI and Legacy ISO Image

Dec 4, 2016 by Grzegorz Juszczak 0 Comments , , , , , , , , ,

GRUB 2 Custom Splash Screen on RHEL 7 UEFI and Legacy ISO Image
GRUB2 Linux Boot Loader provides few customization options, that can transform it into an attention drawing eye candy. It’s main feature is the possibility to customize the splash screen being displayed with GRUB 2 menu entries upon system boot. This feature can be used not only in GRUB2 installed on hard disk for already installed operating systems, but also in GRUB2 Boot Loader placed on ISO image when booting from ISO/CD/DVD. This is pretty useful as well, when we want to create customized ISO image with the company logo based on some Linux Distro, which provides a company product.

In this tutorial we present how to create:

  1. GRUB2 custom splash screen on RHEL 7 / CentOS 7 ISO image for UEFI Boot
  2. GRUB2 custom splash screen on RHEL 7 / CentOS 7 ISO image for Legacy BIOS Boot

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Linux, Virtualization

How to Install VirtualBox 5.1 on Fedora 23 from RPMs

Nov 17, 2016 by Grzegorz Juszczak 0 Comments , , , ,

install virtualbox 5.1 on fedora 23
Oracle VM VirtualBox is a flexible open-source hypervisor for x86 computers from Oracle Corporation initially developed by Innotek GmbH. It runs on many platforms including: Linux, Windows, Solaris, providing great virtualization environment to run multiple VMs at a time.

In this tutorial we present how to install VirtualBox 5.1 on Fedora 23 from RPMs in few simple steps.
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Linux

How to find Linux filesystem by Label or UUID using findfs, lsblk, blkid

Nov 2, 2016 by Grzegorz Juszczak 0 Comments , , , , , , ,

find Linux filesystem by label or UUID using findfs, lsblk, blkid
Linux includes by default a bunch of useful filesystem tools that can be used to locate filesystems or partitions with specified tags or display the whole list of block devices along with their labels, universally unique identifiers (UUIDs) or default mount points.

Below we present common tools to locate filesystem, block device or list all block devices in Linux.
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Linux

How to install Spotify on Fedora 23 from RPM package

Sep 18, 2016 by Grzegorz Juszczak 0 Comments , , , ,

install Spotify Client on Fedora release 23 from RPM using DNF upgrade method
Spotify is a music, podcast, and video streaming service that provides digital rights management–protected content from different record companies. Spotify provides access to over 30 million songs, with more music being added approximately every day including albums, EPs, and singles.

In this article we present how to install Spotify Client on Fedora release 23 from RPM using DNF package manager.
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Linux

Upgrade from Fedora 22 to Fedora 23 or higher release using DNF

Sep 18, 2016 by Grzegorz Juszczak 0 Comments , , , , , ,

fedora_logo
DNF system upgrade is recommended upgrade method for Fedora 21 and later releases. DNF is a kind of successor for FedUp (FEDora UPgrader), which is now obsolete, not supported any more by Fedora Project and should not be used any longer.

In this article we upgrade from Fedora release 22 (Twenty Two) to Fedora release 23 (Twenty Three) or higher release in few simple steps, using DNF system upgrade method.
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Bash, Linux

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

Sep 11, 2016 by Grzegorz Juszczak 10 Comments , , , , , , , , , ,

Mount Modify Edit Re-pack Create UEFI ISO including Kickstart file
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 for Kickstart Linux installation.

Kickstart File can be placed in the remote repository, accesible via NFS, HTTP, FTP, etc…, or can be included in ISO image, which is pretty convenient, especially when we don’t want to or don’t have a possibility to create network repository to store a Kickstart File.

In this tutorial we will download original CentOS 7.2 / RHEL 7.2 ISO image, mount it in the Linux file system, modify it by adding Kickstart File (ks.cfg) and re-pack it to create custom UEFI bootable RHEL 7.2 ISO image using mkisofs command.
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Bash, Linux

Create USB Boot Disk in Linux using dd command

Aug 28, 2016 by Grzegorz Juszczak 0 Comments , , , , , , , , , ,

create usb boot disk using dd utility
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 can be used to quickly create USB Boot Disk from the given ISO file without using dedicated tools like unetbootin.
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Cloud Computing

OpenStack Horizon Error: Unable to get network agents info

Aug 21, 2016 by Grzegorz Juszczak 0 Comments , ,

OpenStack Horizon Error: Unable to get network agents info
OpenStack Dashboard Error: Unable to get network agents info often seen in Horizon is a result of Neutron related problems.

Usually the problem is caused by neutron-service failure due to service operation time outs.

The below screenshot presents OpenStack Dashboard Error: Unable to get network agents info:

openstack error: unable to get network agents info
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