Author Archives: George Valentin Voina

Blog Links: What is Blockchain Technology? A Step-by-Step Guide For Beginners

By | December 18, 2016

A great introduction to blockchain hype, void of all the marketing blah-blah and boardroom nonsense. A must read for anyone that wants to know what blockchain is all about. What is Blockchain Technology? A Step-by-Step Guide For Beginners [paypal_donation_button]

#Apache: Use #letsencrypt.org certificates with an apache server behind a secure reverse proxy

By | March 8, 2017

As I described in a previous post Apache: How to use reverse secure proxy to chain secure apache servers – updated I have a configuration of chained secure apache servers, where one of the servers provides https resources but also acts as a reverse proxy for another server providing https resources. On the first server… Read More »

Blog Links: Oracle Trace File Analyzer (TFA)

By | February 8, 2017

One of the best introduction tutorial I have seen about a useful tool set. I am sick of all the empty marketing “pitches” I see daily. Oracle Trace File Analyzer (TFA) – An Overview Guide A must read for anyone that has to work with Oracle DB and needs to do a deep investigation of… Read More »

Blog Links: Anonymity of cryptocurrencies

By | December 14, 2016

A very interesting article about the anonymity issues of Bitcoin and alternatives. Bitcoin Isn’t Anonymous Enough. There are companies that already offer Bitcoin OFAC and AML: Elliptic You may think again if you want to switch from cash to cryptocurrencies for your “under the radar” payments. But still even with cash you have to keep… Read More »

Docker: Install a Nexus Raw Repository for Docker-compose files

By | December 14, 2016

This is a continuation of the post Install a Nexus Repository. In the following I will describe how to deploy a raw maven repository for the docker-compose files, docker make files and other text files. This repository will be used as the main entry point to the docker repository. STEP 1: Create a raw repository… Read More »

#Docker: Install a #Nexus Repository

By | May 26, 2017

I had the task to find a way to store centrally docker containers of enterprise applications. The following constraints had to be met: – the containers should be used for QA and training by people who do not need to know the details of deploying complicated enterprise application environments. Docker-compose files will be used to… Read More »

Blog Links: Infinit Storage

By | February 8, 2017

A very interesting distributed storage solution Infinit Storage Platform. So interesting that the small company that implemented it was bought by Docker. By the way it has a docker plugin so can be mounted as a volume in any docker container. Looks like a very nice way of having a distributed, high availability storage with… Read More »

Hibernate: Optimize updates with @DynamicUpdate

By | June 29, 2018

When using Hibernate as a layer between your Java code and the Database layer you release control on how the actual SQL query is generated. Hibernate will generate from the HSQL you write the “best” query. That “best” is in fact sometimes sub-optimal. A very important Hibernate 4 (make sure you have at least 4.2.5)… Read More »

ILO: Get the ILO IP from a Linux host server

By | December 4, 2016

In case your HP ILO is set to DHCP there is the need to find out what is the allocated IP in case you do not have access to the cosole. The easiest way is to use ipmi tools. STEP 1 : Install ipmi tools # dnf install ipmitools STEP 2: Load the ipmi kernel… Read More »

Apache: How to use reverse secure proxy to chain secure apache servers – updated

By | May 26, 2017

On the site I host my services I have only one IP from the ISP and naturally a single 443 port to server https requests. If you have to host multiple sites behind that you can do it very easy with apache. You just have to define Virtual hosts for each different site. Define a… Read More »