https://virtengine.com/blog Protocol notes and the preserved VirtEngine blog archive. en-au Tue, 01 Sep 2026 00:00:00 GMT https://virtengine.com/blog/from-cloud-platform-to-decentralized-marketplace https://virtengine.com/blog/from-cloud-platform-to-decentralized-marketplace Tue, 01 Sep 2026 00:00:00 GMT VirtEngine Foundation How VirtEngine's early cloud-management work evolved into an open protocol for verifiable infrastructure markets. https://virtengine.com/blog/why-cloud-marketplace-settlement-belongs-on-chain https://virtengine.com/blog/why-cloud-marketplace-settlement-belongs-on-chain Fri, 28 Aug 2026 00:00:00 GMT VirtEngine Foundation A closer look at orders, bids, leases, metered usage, escrow, and transparent settlement in an open infrastructure market. https://virtengine.com/blog/verifiable-identity-for-decentralized-infrastructure https://virtengine.com/blog/verifiable-identity-for-decentralized-infrastructure Fri, 21 Aug 2026 00:00:00 GMT VirtEngine Foundation Why infrastructure markets need privacy-preserving identity evidence, active liveness, scoped verification, and auditable trust signals. https://virtengine.com/blog/virtengine-hostingcon https://virtengine.com/blog/virtengine-hostingcon Wed, 19 Oct 2016 13:00:00 GMT VirtEngine by DET.io Introduction VirtEngine will be exhibiting in HostingCon India 2016! Make sure to visit our Booth @ G1 if you’re paying a visit. About HostingCon HostingCon is the premiere industry confe… https://virtengine.com/blog/launching-virtengine-centos https://virtengine.com/blog/launching-virtengine-centos Mon, 17 Oct 2016 13:00:00 GMT VirtEngine by DET.io Introduction Before we begin, lets install OpenJDK8 and cassandra. This tutorial will help you set up VirtEngine. Prerequisites OpenJDK8 su -c “yum install java-1.8.0-openjdk” Cassandra 3… https://virtengine.com/blog/how-to-create-a-cassandra-replication https://virtengine.com/blog/how-to-create-a-cassandra-replication Wed, 13 Jul 2016 14:00:00 GMT VirtEngine by DET.io Introduction Cassandra stores replicas on multiple nodes to ensure reliability and fault tolerance. A replication strategy determines the nodes where replicas are placed. The total number… https://virtengine.com/blog/secure-docker-container-using-kvm https://virtengine.com/blog/secure-docker-container-using-kvm Wed, 29 Jun 2016 14:00:00 GMT VirtEngine by DET.io Introduction One of the questions we have been asked is what is the secret sauce in our enterprise edition as all our stuff is opensource. Hence this is one of our secret sauce. Yes if yo… https://virtengine.com/blog/cloud-backup-megamafrica https://virtengine.com/blog/cloud-backup-megamafrica Sun, 26 Jun 2016 14:00:00 GMT VirtEngine by DET.io Introduction You want to backup your data in cloud and access it on need. Cloudberry backup desktop client can be used to backups files and folders on your Windows machine to our cloud st… https://virtengine.com/blog/getting-started-atharva-storage-in-megamafrica https://virtengine.com/blog/getting-started-atharva-storage-in-megamafrica Thu, 16 Jun 2016 14:00:00 GMT VirtEngine by DET.io Introduction Atharva Storage - VirtEngine is a “Cloud object storage, low latency and (S3 - AWS Signature v2) compatible API built on top of ceph - jewel.”. This tutorial will guide you c… https://virtengine.com/blog/atharva-ceph-windows https://virtengine.com/blog/atharva-ceph-windows Wed, 15 Jun 2016 14:00:00 GMT VirtEngine by DET.io Introduction S3 Browser is a freeware Windows client for Amazon S3. Amazon S3 provides a simple web services interface that can be used to store and retrieve any amount of data, at any ti… https://virtengine.com/blog/private-registry-along-with-ceph https://virtengine.com/blog/private-registry-along-with-ceph Thu, 09 Jun 2016 14:00:00 GMT VirtEngine by DET.io Introduction A Docker registry serves to manage Docker images in your organization, whether created internally or downloaded from remote Docker resources such as Docker Hub . The Registry… https://virtengine.com/blog/ceph-object-gateway-using-jewel https://virtengine.com/blog/ceph-object-gateway-using-jewel Wed, 01 Jun 2016 14:00:00 GMT VirtEngine by DET.io Ceph Object Gateway is an object storage interface built on top of librados to provide applications with a RESTful gateway to Ceph Storage Clusters. Ceph Object Storage supports two inter… https://virtengine.com/blog/how-to-launch https://virtengine.com/blog/how-to-launch Thu, 26 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Apache CouchDB, commonly referred to as CouchDB, is open source database software that focuses on ease of use and having an architecture that “completely embraces the Web”. I… https://virtengine.com/blog/how-to-launch-ubuntu https://virtengine.com/blog/how-to-launch-ubuntu Thu, 26 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction VirtEngine is an end-to-end open source cloud management platform offered as a bundled offering with IaaS and can run apps, services, micro services (Docker), Analytics on hy… https://virtengine.com/blog/how-to-launch-dockercontainer-in-megamafrica https://virtengine.com/blog/how-to-launch-dockercontainer-in-megamafrica Thu, 26 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you… https://virtengine.com/blog/how-to-install-docker-container https://virtengine.com/blog/how-to-install-docker-container Thu, 26 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Docker containers wrap up a piece of software in a complete filesystem that contains everything it needs to run: code, runtime, system tools, system libraries – anything you… https://virtengine.com/blog/how-to-launch-wordpress https://virtengine.com/blog/how-to-launch-wordpress Wed, 25 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction WordPress is web software you can use to create a beautiful website, blog, or app. We like to say that WordPress is both free and priceless at the same time. And WordPress is… https://virtengine.com/blog/open-web-analytics-installer https://virtengine.com/blog/open-web-analytics-installer Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Open Web Analytics (OWA) is an open source web analytics framework written in PHP. OWA was born out of the need for an open source framework that could be used to easily add… https://virtengine.com/blog/how-to-launch-travis-web https://virtengine.com/blog/how-to-launch-travis-web Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction In software development, Travis-web is an open-source hosted, distributed continuous integration service used to build and test projects hosted at GitHub. Travis CI is config… https://virtengine.com/blog/how-to-launch-redis https://virtengine.com/blog/how-to-launch-redis Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Redis is an open source (BSD licensed), in-memory data structure store, used as database, cache and message broker. It supports data structures such as strings, hashes, lists… https://virtengine.com/blog/how-to-launch-opsworks-php-simple-demo-app https://virtengine.com/blog/how-to-launch-opsworks-php-simple-demo-app Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction AWS OpsWorks PHP is a simple demo app that can help you get started using your favourite PHP language. This tutorial will guide you in launching a php web application (OpsWor… https://virtengine.com/blog/how-to-launch-mysql https://virtengine.com/blog/how-to-launch-mysql Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction MySQL is the world’s most popular open source database. It runs on virtually all platforms, including Linux, UNIX, and Windows. Although it can be used in a wide range of app… https://virtengine.com/blog/how-to-launch-etherpad-lite https://virtengine.com/blog/how-to-launch-etherpad-lite Tue, 10 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Etherpad is a really-real time collaborative editor maintained by the Etherpad Community.Etherpad is designed to be easily embeddable and provides a HTTP API that allows your… https://virtengine.com/blog/how-to-launch-sdk-using-cc-python https://virtengine.com/blog/how-to-launch-sdk-using-cc-python Mon, 09 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction A software development kit (SDK or “devkit”) is typically a set of software development tools that allows the creation of applications for a certain software package, softwar… https://virtengine.com/blog/how-to-launch-postageapp-in-php https://virtengine.com/blog/how-to-launch-postageapp-in-php Mon, 09 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction The PostageApp is used in quick way to deliver the email. This application supports PHP.It optionally attachs it to the mail server. This tutorial will guide you in launching… https://virtengine.com/blog/launching-jenkins https://virtengine.com/blog/launching-jenkins Sun, 08 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Jenkins is the leading open-source automation server. Built with Java, it provides over 1000 plugins to support automating virtually anything, so that humans can actually spe… https://virtengine.com/blog/launch-ubuntu https://virtengine.com/blog/launch-ubuntu Sun, 08 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Ubuntu is a Debian-based Linux operating system and distribution for personal computers, smartphones and network servers. It uses Unity as its default user interface. It is b… https://virtengine.com/blog/how-to-launch-spring-webflow https://virtengine.com/blog/how-to-launch-spring-webflow Sun, 08 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Spring Web Flow facilitates building the j2EE based web applications that require guided navigation – e.g. a shopping cart, flight check-in, a loan application, and many othe… https://virtengine.com/blog/how-to-launch-debian-jessie https://virtengine.com/blog/how-to-launch-debian-jessie Sun, 08 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction Debian is a Unix-like computer operating system that is composed entirely of free software, most of which is under the GNU General Public License, and packaged by a group of… https://virtengine.com/blog/how-to-launch-centos https://virtengine.com/blog/how-to-launch-centos Sun, 08 May 2016 14:00:00 GMT VirtEngine by DET.io Introduction The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL). CentOS Linux is deve… https://virtengine.com/blog/creating-customized-images https://virtengine.com/blog/creating-customized-images Sat, 30 Apr 2016 14:00:00 GMT VirtEngine by DET.io title: Building your own VM Image (Dockerfile for VMs) layout: post og_image_url: “https://blog.virtengine.com/res/gotalk-intro.png” description: Building your own VM Image (Dockerfile fo… https://virtengine.com/blog/packet-net-networking-for-opennebula-host https://virtengine.com/blog/packet-net-networking-for-opennebula-host Mon, 29 Feb 2016 13:00:00 GMT VirtEngine by DET.io Our need is to setup opennebula in packet.net , so we have a server for both opennebula-frontend and opennebula-host. We have a local working server for opennbula-host with openvswitch. B… https://virtengine.com/blog/spark-notebook-for-developer https://virtengine.com/blog/spark-notebook-for-developer Sun, 07 Feb 2016 13:00:00 GMT VirtEngine by DET.io Introduction Spark-notebook allows performing reproducible with scala,Apache Spark and more. This is achieved through an interactive web-based editor that can combine Scala code, SQL quer… https://virtengine.com/blog/package-upgrade-from-trusty-to-jessie https://virtengine.com/blog/package-upgrade-from-trusty-to-jessie Fri, 05 Feb 2016 13:00:00 GMT VirtEngine by DET.io Upgrading is new versioning of an existing model that add or modify the modules of an already defined package. Here we upgrading the Ubuntu Trusty to a newer version. Upgrading “fpm” is u… https://virtengine.com/blog/chef-vs-urknall https://virtengine.com/blog/chef-vs-urknall Fri, 05 Feb 2016 13:00:00 GMT VirtEngine by DET.io An Introduction to Urknall Urknall is Go based automation provising tools for the administration of complex infrastructure developed in Golang. Agentless tool that only relies on common U… https://virtengine.com/blog/getting-more-native-welcome-scylladb https://virtengine.com/blog/getting-more-native-welcome-scylladb Thu, 04 Feb 2016 13:00:00 GMT VirtEngine by DET.io Is it not an uncommon fact that cassandra is the defacto NoSQL database that is being used in the bigdata world at the moment. It is known for its ease and performance, and the constant p… https://virtengine.com/blog/build-and-release-management-for-gogodep https://virtengine.com/blog/build-and-release-management-for-gogodep Thu, 04 Feb 2016 13:00:00 GMT VirtEngine by DET.io Introduction If you are using 3rd party packages, (packages that you don’t own or control), you will want a way to create a reproducible build every time you build your projects. If you u… https://virtengine.com/blog/getting-started-with-spark-jobserver https://virtengine.com/blog/getting-started-with-spark-jobserver Mon, 01 Feb 2016 13:00:00 GMT VirtEngine by DET.io Spark-jobserver is a really cool RESTful interface for submitting and managing Apache Spark jobs, jars, and job contexts. At megam our analytics platform Meglytics is powered by apache sp… https://virtengine.com/blog/nsqd-messaging-server https://virtengine.com/blog/nsqd-messaging-server Fri, 25 Dec 2015 13:00:00 GMT VirtEngine by DET.io NSQd A reatime distributed light weight messaging platform. We have used RabbitMQ heavily in clustered mode. Lately we have found issues with file description(fd) limit getting reached ev… https://virtengine.com/blog/hetzner-networking-in-ubuntu-host https://virtengine.com/blog/hetzner-networking-in-ubuntu-host Mon, 14 Dec 2015 13:00:00 GMT VirtEngine by DET.io Our need is to setup opennebula in hetzner , so we have two servers, one is for opennebula-frontend and another one is for opennebula-host. We don’t face any problem in opennebula front-e… https://virtengine.com/blog/how-to-build-a-gem https://virtengine.com/blog/how-to-build-a-gem Mon, 07 Dec 2015 13:00:00 GMT VirtEngine by DET.io WHAT IS A RUBY GEM? A gem is essentially a Ruby plugin. RubyGems is a package manager for the Ruby programming language that provides a standard format for distributing Ruby programs and… https://virtengine.com/blog/gradle-for-scala https://virtengine.com/blog/gradle-for-scala Mon, 07 Dec 2015 13:00:00 GMT VirtEngine by DET.io Installing gradle We have decided to gradually migrate all our projects to gradle from sbt due to its performance. In our recent sparkbuilder project we found a need to natively build jar… https://virtengine.com/blog/datacenter-using-opennebula-federation https://virtengine.com/blog/datacenter-using-opennebula-federation Thu, 26 Nov 2015 13:00:00 GMT VirtEngine by DET.io The federation is performed by OpenNebula platform. The OpenNebula is an Open-source software for manage virtualized data centers.The data centers are oversees private clouds, public clou… https://virtengine.com/blog/ceph-gateway https://virtengine.com/blog/ceph-gateway Mon, 12 Oct 2015 13:00:00 GMT VirtEngine by DET.io Ceph Object Gateway is an object storage interface built on top of librados to provide applications with a RESTful gateway to Ceph Storage Clusters. Ceph Object Storage supports two inter… https://virtengine.com/blog/ch https://virtengine.com/blog/ch Tue, 29 Sep 2015 14:00:00 GMT VirtEngine by DET.io Introduction Test Kitchen is a test harness tool to execute your configured code on one or more platforms in isolation. We’re going to use Test Kitchen to help us write a simple Chef cook… https://virtengine.com/blog/localization-of-nilavu https://virtengine.com/blog/localization-of-nilavu Tue, 15 Sep 2015 14:00:00 GMT VirtEngine by DET.io What is Internationalization? Internationalization means adapting computer software to different languages, regional differences and technical requirements of a target market. Internation… https://virtengine.com/blog/codebox-installation-procedure https://virtengine.com/blog/codebox-installation-procedure Wed, 09 Sep 2015 14:00:00 GMT VirtEngine by DET.io The Codebox IDE helps to create powerful development environments in the cloud with a collaborative, online/offline IDE for your collaborators and your teams.This component is available a… https://virtengine.com/blog/mysql-master-slave-replication https://virtengine.com/blog/mysql-master-slave-replication Mon, 07 Sep 2015 14:00:00 GMT VirtEngine by DET.io MySQL is the world’s most popular open source database. MySQL can cost-effectively help you deliver high performance, scalable database applications. REPLICATION Master-slave data replica… https://virtengine.com/blog/riak-cluster https://virtengine.com/blog/riak-cluster Wed, 26 Aug 2015 14:00:00 GMT VirtEngine by DET.io Riak is a distributed NoSQL key-value data store that offers extremely high availability, fault tolerance, operational simplicity and scalability.[2] In addition to the open-source versio… https://virtengine.com/blog/rabbitmq-cluster https://virtengine.com/blog/rabbitmq-cluster Wed, 26 Aug 2015 14:00:00 GMT VirtEngine by DET.io RabbitMQ is an open source message broker software (sometimes called message-oriented middleware) that implements the Advanced Message Queuing Protocol (AMQP). The RabbitMQ server is writ… https://virtengine.com/blog/docker-swarm https://virtengine.com/blog/docker-swarm Tue, 25 Aug 2015 14:00:00 GMT VirtEngine by DET.io This summer @megamsys we started implementing micro services (containers) in baremetal for our customer and our public service in beta The market largely is about 4 kinds + emerging unike… https://virtengine.com/blog/design-technique-for-building-an-api-using-scalaz https://virtengine.com/blog/design-technique-for-building-an-api-using-scalaz Tue, 07 Jul 2015 14:00:00 GMT VirtEngine by DET.io In Part1 we looked at how does the general RESTful API design for the input request look like. We will use functional programming design technique - scalaz library and apply it to the des… https://virtengine.com/blog/rust https://virtengine.com/blog/rust Sun, 24 May 2015 14:00:00 GMT VirtEngine by DET.io In this we will get started with the cool language from mozilla - Rust. We will use functional programming as far as we can. Rust supports it in an elegant way. Rust rust is a systems pro… https://virtengine.com/blog/docker-introduction https://virtengine.com/blog/docker-introduction Sun, 24 May 2015 14:00:00 GMT VirtEngine by DET.io Docker Docker Docker! what the heck..? Let us consider a scenario where you are planning to deploy an application or service. Now, to deploy an application, the most sensible thing to do… https://virtengine.com/blog/solving-keyboard-interrrupt-error-in-centos7-0 https://virtengine.com/blog/solving-keyboard-interrrupt-error-in-centos7-0 Thu, 30 Apr 2015 14:00:00 GMT VirtEngine by DET.io Introduction when we launched the vm by using image centos7.0. In vm , I tried to install the git yum install git that keyboard interrupt error is raised on the screen.To solve this error… https://virtengine.com/blog/playing-with-configuration-in-gotsuru https://virtengine.com/blog/playing-with-configuration-in-gotsuru Thu, 26 Mar 2015 13:00:00 GMT VirtEngine by DET.io Application configuration A config file is a reasonable way to maintain different environments such as development and production. For most applications configuration includes logging lev… https://virtengine.com/blog/concurrency-in-go https://virtengine.com/blog/concurrency-in-go Thu, 26 Mar 2015 13:00:00 GMT VirtEngine by DET.io What is concurrency? Execution of multiple processes independantly and they may or may not be getting executed at the same time. Imagine a webserver gets multiple smaller requests and the… https://virtengine.com/blog/ceph-in-a-single-node https://virtengine.com/blog/ceph-in-a-single-node Thu, 26 Mar 2015 13:00:00 GMT VirtEngine by DET.io Ceph is one of the most interesting distributed storage systems available, with a very active development and a complete set of features that make it a valuable candidate for cloud storag… https://virtengine.com/blog/haddop_spark_multinode_setup https://virtengine.com/blog/haddop_spark_multinode_setup Wed, 25 Mar 2015 13:00:00 GMT VirtEngine by DET.io This is an installation guide for Apache Hadoop and Apache Spark on a multi node setup. We will use Cloudera v5 as it has the packages for debian. You are free to use Hortonworks ,MapR (o… https://virtengine.com/blog/rest_api_playframework https://virtengine.com/blog/rest_api_playframework Tue, 17 Mar 2015 13:00:00 GMT VirtEngine by DET.io We are going to build a beautiful REST API based on a modern playframework using Scala in a functional way. Let us start by understanding the concept of REST in a simpler sense. RESTful A… https://virtengine.com/blog/setting-up-scala-sbt-play-akka https://virtengine.com/blog/setting-up-scala-sbt-play-akka Sun, 15 Mar 2015 13:00:00 GMT VirtEngine by DET.io Part 1 : Setting up Scala, SBT, Play, Akka This will be multi-part series in building a cloud API server for our PaaS with cloud instrumentation using a messaging layer. 1. Let us setup S… https://virtengine.com/blog/how-to-contribute-to-a-git-repository https://virtengine.com/blog/how-to-contribute-to-a-git-repository Fri, 13 Mar 2015 13:00:00 GMT VirtEngine by DET.io Now that you know the little gists on creating a forking and cloning a repository,let’s move on and learn about how to contribute to a Git repository. A great way to get involved in open… https://virtengine.com/blog/setting-up-golang https://virtengine.com/blog/setting-up-golang Thu, 12 Mar 2015 13:00:00 GMT VirtEngine by DET.io Introduction Go, also commonly referred to as golang, is a programming language initially developed at Google in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson . Go is: • open sourc… https://virtengine.com/blog/how-to-use-oauth-in-ror https://virtengine.com/blog/how-to-use-oauth-in-ror Thu, 12 Mar 2015 13:00:00 GMT VirtEngine by DET.io I hate signing up for websites. I’ve already signed up for so many, using different usernames, that going back to one of them and trying to remember my credentials is sometimes impossible… https://virtengine.com/blog/chef-setup https://virtengine.com/blog/chef-setup Thu, 12 Mar 2015 13:00:00 GMT VirtEngine by DET.io Chef is a configuration management and automation platform from Opscode . Chef helps you describe your infrastructure with code. Because your infrastructure is managed with code, it can b… https://virtengine.com/blog/git-for-newbies https://virtengine.com/blog/git-for-newbies Wed, 11 Mar 2015 13:00:00 GMT VirtEngine by DET.io Wondering what Git and Github are all about? Well,firstly: Git and GitHub- What is the difference? Git is a version control system ; think of it as a series of snapshots(commits) of your… https://virtengine.com/blog/megam_install_ruby https://virtengine.com/blog/megam_install_ruby Mon, 02 Mar 2015 13:00:00 GMT VirtEngine by DET.io We recommend you install git , curl before you get started. In Ubuntu sudo apt-get install git curl Pre-reqs Make your current non-root user as a sudoer. To do so, write a file /etc/sudoe…