Author: Grzegorz Juszczak

Linux, Storage

CentOS 7 Installation with LVM RAID 1 – Mirroring

Mar 31, 2018 by Grzegorz Juszczak 3 Comments , , , , , , , ,

CentOS 7 installation with LVM RAID 1 mirroring
CentOS 7 may offer us a possibility of automatic RAID configuration in Anaconda installer, that is during OS installation, once it detects more than one physical device attached to the computer. Mentioned RAID is generally the LVM-RAID setup, based on well known mdadm – Linux Software RAID. It’s a pretty convenient solution, since we don’t need to setup RAID manually after installation, on already running system.

The below procedure presents CentOS 7 testing installation with LVM RAID 1 (Mirroring) on KVM based Virtual Machine with two attached 20GB virtual disks.
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Cloud Computing, Linux

MariaDB high CPU usage in OpenStack Pike

Jan 6, 2018 by Grzegorz Juszczak 7 Comments , , , , , , , ,

MariaDB High CPU usage in OpenStack Pike
Testing OpenStack Pike after Packstack based deployment I realised MySQL daemon was utilizing 100% CPU resources without any specific reason, but I had never faced such problem before in previous OpenStack releases. The problem also has never appeared during my TripleO based OpenStack Pike deployments, so looks like it’s strictly Packstack related issue.

The situation heppened on few bare metal installations on pretty powerful servers. Restarting mariadb service was helpful just for the first few minutes after service restart, then the problem would happen again and again, what resulted in frequent Horizon Dashboard and Keystone inaccessibility and partial Controller unavailability.
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Cloud Computing, Virtualization

OpenStack Pike VLAN and Flat network based installation using Packstack

Dec 30, 2017 by Grzegorz Juszczak 5 Comments , , , , , , , , ,

OpenStack Pike VLAN and Flat network based Installation using Packstack
In previous articles regarding OpenStack RDO installations we presented OpenStack deployments using Packstack automated installer script, which still required some post-installation networking configuration to be performed in order to accomplish whole deployment. This time we will try to prepare Packstack configuration file (answers.txt) in such way, that it does all the magic and no post-installation configuration is required. We will make full bridge:interface mapping so, that no further bridge setup is needed and the environment should be ready to use immediately after Packstack deployment.
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Cloud Computing, Virtualization

How to find qbr,qvo interfaces of the particular Instance in OpenStack

Nov 20, 2017 by Grzegorz Juszczak 0 Comments , , , , , , , ,

locate qbr,qvo interfaces of the particular Instance in OpenStack
OpenStack networking topology is pretty complicated structure, even with it’s, let’s say, default configuration based on OVS (OpenVSwitch), not even mentioning about additional overlays, like OpenDaylight or Nuage.
If you are troubleshooting network issues in regard to a particular Instance (VM), it’s good to locate network overlay interfaces (qbr, qvo) assigned to that Instance to have a starting point to begin your network analysis from. You can then analyze inbound/outbound traffic on those interfaces using network protocol analyzers, like tcpdump/wireshark.

Below you can find few steps, how to locate qbr,qvo interfaces belonging to a particular Instance:
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Storage

RAID 1 configuration on HP Proliant Gen 9 server using HP SSA

Oct 31, 2017 by Grzegorz Juszczak 1 Comments , , , , , , , ,

Mount WebDAV remote storage in Fedora Linux using davfs2 driver
HPE Smart Storage Administrator is a tool that allows to quickly configure and manage storage controllers on HPE Proliant servers. HPE SSA offers a simple, intuitive and easy to use GUI interface to quickly create, modify and erase storage arrays based on physical drives installed in the server. HPE SSA replaces the HPE Array Configuration Utility (ACU), and has an updated design for HPE ProLiant servers that enhances the storage experience.

In this short tutorial we will create one of the simplest storage arrays, which is RAID 1 based on two physical drives. RAID 1 (mirroring) provides a replication on all physical drives by writing data to all of them at the same time, it gives us fault-tolerance of N-1 drives where N is a number of used physical drives.
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Cloud Computing, Linux

Deploy project tenant in OpenStack using Heat orchestration stack

Feb 13, 2017 by Grzegorz Juszczak 0 Comments , , , , , , , , ,

Deploy tenant in OpenStack using Heat Orchestration service stack
Heat is an OpenStack Orchestration service, which implements an orchestration engine to launch multiple composite cloud applications based on templates in the form of text files that can be treated like code. Heat service is able to read YAML (.yaml, .yml) files and perform different tasks inside OpenStack environment included in YAML components. Using Heat Orchestration we can create instances, networks or even whole tenants with just single mouse click in OpenStack dashboard (Horizon), if we have previously prepared YAML file with Heat instructions to be performed in OpenStack cloud.

In this tutorial we will create example .yaml file for Heat orchestration containing instructions and components needed to deploy project tenant in OpenStack and launch instances inside the tenant. Next, we will create our stack on single OpenStack all-in-one node based on CentOS 7.3 operating system.
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Linux

Fedora DNF rollback RPM package update, removal, installation

Feb 6, 2017 by Grzegorz Juszczak 0 Comments , , , , , , ,

DNF rollback RPM package update, removal or installation
DNF is a next generation package manager for RPM-based Linux distributions, commonly used in newest Fedora releases. DNF is a Yum succesor, which provides Yum backward compatibility, but one of aspects, which make DNF a powerful package manager is the ability to manage transaction history.

Using DNF, we can easily undo or redo RPM package upgrade, installation and removal. This gives us the opportunity to rollback the system, if we feel, that our recent RPM package operations disordered the system.

Below we presents, how to work with DNF transaction history on Fedora 24.
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Linux, Storage

Mount WebDAV remote storage in Fedora Linux using davfs2 driver

Feb 5, 2017 by Grzegorz Juszczak 0 Comments , , , , , , , , ,

Mount WebDAV remote storage in Fedora Linux using davfs2 driver
WebDAV (Web Distributed Authoring and Versioning) is an extension of the Hypertext Transfer Protocol (HTTP) that allows clients to perform remote Web content authoring operations. The WebDAV protocol provides a framework for users to create, change, copy, move, lock and version the files on a server, typically a web server or web share. This type of protocol is used by some hosting providers (like my favorite HostUpon) in cPanel software, to provide quick and easy access to the files stored in hosting account disk space.

In this tutorial we are mounting remote WebDAV resource in Fedora release 24 via davfs2 file system driver.
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Linux

Install Jenkins on Fedora 23 from RPM via DNF package manager

Jan 25, 2017 by Grzegorz Juszczak 1 Comments , , , , , , , , ,


Jenkins is a popular and open source automation server written in Java, which helps automate the non-human part of the whole software development process. Jenkins supports BASH shell scripts, can be integrated with version control systems and it’s builds can be scheduled via a cron-like mechanism.

In this tutorial we are installing Jenkins stable version from RPM package via Jenkins dedicated repository using DNF package manager.
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Bash, Cloud Computing

Create tenant in OpenStack Newton using command line interface

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

Create tenant in Openstack Newton using command line interface
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 when performed in Horizon. Using command line interface with previously prepared command templates can be more efficient and faster.

In this tutorial we present how to create Project Tenant in OpenStack Newton using command line intrerface and launch Cirros based Instances inside the Tenant.

Some time ago OpenStack Community introduced new tool called OpenStackClient (OSC) with it’s openstack command utility to unify OpenStack management, which encompasses the following components: Compute, Identity, Image, Object Storage and Block Storage APIs. So far keystone command utility was withdrawn from OpenStack as deprecated and replaced by mentioned openstack command utility. In this tutorial for Newton release we are going to use openstack commands where possible to become familiar with OpenStackClient CLI.
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