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Author: Grzegorz Juszczak

How to Manually Extend Cinder Volumes Group in OpenStack

September 14, 2015September 19, 2016 1 Comment

Cinder Volumes group is a block storage based on LVM (Logical Volume Manager) volume group, usually situated in Controller node in OpenStack cloud. It provides persistent block storage for runtime instances. During typical packstack installation Cinder Volumes group size is […]

Grzegorz Juszczak Cloud Computing, Storage

How To Reset Forgotten Root Password on RedHat 7 / CentOS 7

September 13, 2015October 27, 2015 No Comments

RedHat 7 / CentOS 7 unlike previous version 6, doesn’t provide the ability to reset / recover root password in signle-user mode any more. This situation takes place, because RedHat 7 / CentOS 7 uses systemd manager instead of sysVinit […]

Grzegorz Juszczak Linux

How To Reset Forgotten Root Password on RedHat 6 / CentOS 6

September 8, 2015October 27, 2015 No Comments

RedHat 6 / CentOS 6 system gives us the opportunity to reset root password in case we forget it, on condition that we have a direct access to the machine on which we want to reset root password. Password can […]

Grzegorz Juszczak Linux

LDAP Installation on CentOS 7 / RHEL 7

August 12, 2015January 14, 2016 No Comments

LDAP stands for Lightweight Directory Access Protocol. As the name suggests, it is a lightweight protocol for accessing directory services, specifically X.500-based directory services. OpenLDAP is a free, open source implementation of the Lightweight Directory Access Protocol (LDAP) developed by […]

Grzegorz Juszczak Linux

How to Create and Attach Cinder Volume to Instance in OpenStack

August 3, 2015November 25, 2015 2 Comments

Cinder Volume is a block storage based on Linux LVM, which can be attached to instance and mounted as a regular file system. In this tutorial we will show you how to create Cinder Volume in OpenStack and attach it […]

Grzegorz Juszczak Cloud Computing

Create tenant in OpenStack and launch instances

May 14, 2015October 22, 2016 15 Comments

In this tutorial we will show you, how to create project tenant in OpenStack Juno and launch instances accessible from external public network. Note: this tutorial is a continuation of OpenStack Installation on CentOS7 / RHEL7 and we assume that […]

Grzegorz Juszczak Cloud Computing

vsftpd installation on CentOS 7 / RedHat 7 with selinux

May 9, 2015October 27, 2015 11 Comments

vsftpd (Very Secure File Transfer Protocol Daemon) is lightweight, fast and default FTP server daemon for rpm-based Linux distributions (CentOS/RHEL/Fedora). We will install vsftpd on CentOS7 with selinux enabled in Enforcing mode.

Grzegorz Juszczak Linux

Install OpenStack Juno on CentOS 7 / RHEL 7

April 20, 2015August 22, 2016 21 Comments

OpenStack is a free and open source cloud computing platform developed as a joint project of Rackspace Hosting and NASA. Users primarily deploy it as an Infrastructure as a Service (IaaS) solution. OpenStack cloud consists of many well know technologies […]

Grzegorz Juszczak Cloud Computing

Detect SSH Brute Force Attack and Locate Attacker

February 19, 2015November 13, 2015 1 Comment

Brute Force Attack consists of systematically checking all possible passwords until the correct one is found. If the host is exposed directly to the Internet (WAN) and SSH service is running on the host, it becomes a subject of constant […]

Grzegorz Juszczak Linux, Security

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