MariaDB Galera three nodes cluster on CentOS 6


Let’s build MariaDB Galera cluster with three nodes on CentOS x64 6.7 Minimal.
On all nodes static IP adresses have been configured.
Node2 –
Node3 –

On all nodes we need to install necessary packages: Continue reading

Cloned Hyper-V CentOS6 Server error “device eth0 does not seem to be present, delaying initialization”

In order to have 3 identical nodes for my MariaDB Galera cluster, I cloned a hyper-v install of CentOS6 and after firing up the clone and trying to start networking received the error: “device eth0 does not seem to be present, delaying initialization

We need to get the list of current eth devices:

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Failed to sync data for Routing group {8EC325CB-B512-587D-9D03-E940E7CC1490} from backup store

After a fresh deployment of Skype for Business Server 2015  on a Windows Server 2012  the Lync Server Front-End service fails to start:


Reviewing the Skype for Business Server 2015 event logs show the following events: Continue reading

Lync Server 2013 Event ID 14649 Error 0x800B0109(CERT_E_UNTRUSTEDROOT)

After the December update Windows Server 2012 no longer trust the certificate that is trusted before. Certificate from RapidSSL is fully in order. In Lync Deployment Wizard certificate is also displayed correctly and without errors. First stop service Lync Server Access Edge was recorded on December 18. Immediately after applying the latest updates for Windows Server 2012 .:) Continue reading

Colorize log files on CentOS and Ubuntu using ccze tool


ccze is a wonderful tool that brings real joy to the arduous task of reading or searching thru log files. It uses a modular approach to support custom colour formatting for popular applications such as Apache, Postfix, Exim, etc. Continue reading

How to install and use vnstat (Network Traffic Monitor) in Linux

vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network traffic for the selected interface(s). It uses the network interface statistics provided by the kernel as information source. This means that vnStat won’t actually be sniffing any traffic and also ensures light use of system resources.
In this article we will show you how to install and use vnStat (Network Traffic Monitor) on RHEL/CentOS linux distribution. Continue reading

SSL/TLS Alert Protocol & the Alert Codes

There have been many occasions where a event corresponding to SChannel is logged in the System event logs which indicates a problem with the SSL/TLS handshake and many a times depicts a number. The logging mechanism is a part of the SSL/TLS Alert Protocol.
SChannel logging may have to be enabled on the windows machines to get detailed SChannel messages. Please refer the following article to do so:

These warnings sometimes are very helpful in troubleshooting SSL related issues and provide important clues. However, there is not much documentation available on the description of the alert codes. Continue reading

Reset administrator password in Drupal

When in Drupal 8, the password for user #1 (the administrator) is lost and the email notification don’t work, it is possible to set the password via a database query.

You’ll need access to your hosting server’s shell and database in order to reset administrator’s password in Drupal. Continue reading

Asterisk installation on CentOS with YUM

Asterisk PBX

Officially now Asterisk packages repository is gone (but packages are still on place). Asterisk installation manual gone as well. This post is some handy memo on Asterisk install from packages using YUM. Continue reading

Updating Polycom SIP Phone firmware

Polycom LogoThis process can be used on any of the Polycom SIP Phones which support 4.x software today (SoundPoint IP, SoundStation IP, VVX, and SpectraLink models).

This only applies to devices which are already running at least version 4.0.0 of the UCS firmware. In previous versions (Polycom SIP software 3.x or earlier) this manual process was not available.  Also the firmware was packaged differently in the previous SIP versions as the device firmware was provided as two separate binary files, the bootloader image and the application image.  In the 4.x UCS release these were merged into the same binary file.  New devices like the VVX500 and SpectraLink phones have only ever shipped with 4.x UCS releases, while older devices like SoundPoint IP phones may still have previous 3.x SIP releases on them.  In order to utilize Lync integration a one-time update process must first be used to upgrade devices running 3.x to 4.x.

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