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Seravo blog: Linux and open source – technology and strategy

World IPv6 Day and how to add IPv6 support to a web server

Today, 6th of June we celebrate World IPv6 day. Ipv6 is the new standard for IP protocols. IPv6 is important because, as everyone by now should know, the public IPv4 address space is running out. In fact all IPv4 address blocks have already been mostly consumed by registrars and the resource problem is being avoided […]

Linux and POWER8 microprocessors

Why POWER8? With the enormous amount of data being generated every day, POWER8 was designed specifically to keep up with today’s data processing requirements on high end servers. POWER8 is a symmetric multiprocessor based on the power architecture by IBM. It’s designed specifically for server environments to have faster execution times and to really concentrate performing well on […]

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The Best of 2015

  Another new year has started, and we think it is time to look a bit back and review what became the most popular content in Seravo Blog in 2015. Alltogether, in 2015, Seravo’s web page gained 233 681 visits and 196 401 users – these are pretty cool numbers for a modest sized company that we […]

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Using RAID with btrfs and recovering from broken disks

Btrfs (pronounced Better FS) is a relatively new filesystem that operates on the copy-on-write principle (abbreviated COW, which stems a more friendly pronunciation for btrfs: Butter FS). Btrfs includes a lot of interesting functionality and replaces traditional Linux disk and filesystem tools like LVM (volume manager, disk snapshots) and mdadm (software RAID). In RAID usage btrfs is much more flexible […]

Android Phone Review: The OnePlus X

OnePlus is a mobile phone manufacturer famous for selling the OnePlus One with pre-installed CyanogenMod, instead of a bloated custom Android as most manufacturers do. Their newest model OnePlus X was released on November 5th 2015 and after a few days of use, it seems to live up to its promises.

Fixing black screen after login in Ubuntu 14.04

How to fix black screen after login in Ubuntu 14.04? (Ohje suomeksi lopussa.) A lot of Linux-support customers have contacted us recently asking to fix their Ubuntu laptops and workstations that suddently stopped working. The symptom is that after entering the username and password in the login screen, they are unable to get in. Instead […]

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Cyberwar never ceases

A great deal of our work as Linux system administrators is related to security. Each server we maintain is bombarded on daily basis in a never ending cyberwar. Some of our customers (e.g. the website of the former Finnish Minister of Foreign Affairs, government websites, high profile political organisations and media sites) are obvious targets but […]

Ubuntu Phone and Unity vs Jolla and SailfishOS

With billions of devices produced, Android is by far the most common Linux-based mobile operating system to date. Of the less known competitors, Ubuntu phone and Jolla are the most interesting. Both are relatively new and neither one has quite yet all the features Android provides, but they do have some areas of innovation where […]

Continuous integration testing for WordPress plugins on Github using Travis CI

Intro We have open sourced and published some plugins on wordpress.org. We only publish them to wordpress.org and do the development in Github. Our goal is to keep them simple but effective. Quite a few people are using them actively and some of them have contributed back by creating additional features or fixing bugs/docs. It’s super nice to […]

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Ubuntu Phone review by a non-geek

  Few weeks ago I found a pretty black box waiting on my desk at the office. There it was, the BQ Aquaris E4.5, Ubuntu edition. Now available for sale all over Europe, the world’s first Ubuntu phone had arrived to the eager hands of Seravo. (Working in an open office with a bunch of […]

Why and how to publish a plugin at WordPress.org

The first ever WordCamp was held in Finland on May 8th and 9th in Tampere. Many from our staff participated in the event and Seravo was also one of the sponsors. On Friday Otto Kekäläinen had a talk with the title “Contributing to WordPress.org – Why you (and your company) should publish plugins at WordPress.org”. […]

WordCamp Finland 2015 brings WordPress enthusiasts together

WordCamps are casual, locally-organized conferences covering everything related to WordPress, the free and open source personal publishing software that powers over 75 million sites on the web. In May of 2015, WordCamp will finally have its debut in Finland. The event is set to take place at the home base of Seravo in Tampere. WordCamps come in all different flavours, based on the […]

OpenFOAM – Open Computational Fluid Dynamics

OpenFOAM (Open source Field Operation And Manipulation) is a numerical CFD (Computational Fluid Dynamics) solver and a pre/postprocessing software suite. Special care has been taken to enable automatic parallelization of applications written using OpenFOAM high-level syntax. Parallelization can be further extended by using a clustering software such as OpenMPI that distributes simulation workload to multiple […]

How to create good OpenPGP keys

The OpenPGP standard and the most popular open source program that implements it, GnuPG, have been well tested and widely deployed over the last decades. At least for the time being they are considered to be cryptographically unbroken tools for encrypting and verifying messages and other data. Due to the lack of easy-to-use tools and […]

10 reasons to migrate to MariaDB (if still using MySQL)

The original MySQL was created by a Finnish/Swedish company, MySQL AB, founded by David Axmark, Allan Larsson and Michael “Monty” Widenius. The first version of MySQL appeared in 1995. It was initially created for personal usage but in a few years evolved into a enterprise grade database and it became the worlds most popular open […]

Password hygiene – every man’s responsibility

Everybody knows what hand hygiene is: hands are disinfected every time we enter a hospital. In the same way as germ-free hands stops diseases from spreading, password hygiene helps to prevent the misuse of credentials. Password hygiene may feel useless when the effect is not immediately visible, but it is never the less very important […]

A guide to modern WordPress deployment (part 2)

Recently we published part one in this series on our brand new WordPress deployment platform in which we covered some of the server side technologies that constitute our next-gen WordPress platform. In part 2 we’ll be briefly covering the toolkit we put together to easily manage the Linux containers that hold individual installations of WordPress. […]

A guide to modern WordPress deployment (part 1)

As a Linux and open source specialist company, Seravo provides services to many companies that run Linux in a web server. Not surprisingly, in many of these cases, the top-level software running on the server is of course, the world’s most popular CMS, WordPress. We love it!

Turn any computer into a wireless access point with Hostapd

Do you want to make a computer function as a WLAN base station, so that other computers can use as it as their wifi access point? This can easily be done using the open source software Hostapd and compatible wifi hardware. This is a useful thing to do if computer acting as a firewall or […]

Host your private cloud easily using ownCloud

Would you like to have the easy of use of cloud storage and file syncing but without the trust issues or costs that come with using public cloud services? Do you like Dropbox but hesitate to use it? What you might be looking for is OwnCloud, the open source software you can run to host […]

CiviCRM – Open Constituent Management for Organisations

For our civic clients, the CRM of choice is CiviCRM – a free constituent management system specifically designed with organisations in mind. CiviCRM in a nutshell CiviCRM is essentially a lightweight relations management system, designed to easily integrate with organisations’ existing platforms, such as Drupal, WordPress or Joomla. Vanilla CiviCRM offers the following list of features out-of-the-box: Contact […]

Optimal Sailfish SDK workflow with QML auto-reloading

Sailfish is the Linux based operating system used in Jolla phones. Those who develop apps for Jolla use the Sailfish SDK (software development kit), which is basically a customized version of Qt Creator. Sailfish OS apps are written using the Qt libraries and typically in the C++ programming language. The user interfaces of Sailfish apps […]

The best replacement for Windows XP: Linux with LXDE

As of today, Microsoft has officially ended the support for Windows XP and it will no longer receive any security updates. Even with the updates, XP has never been a secure platform and by now users should really stop using it. But what should people install instead? Our recommendation is Lubuntu. Windows XP has finally […]

Open source for office workers

Open source software is great and it’s not only great for developers who can code and use the source directly. Open source is a philosophy. Open source is for technology like what democracy is for society: it isn’t magically superior right away, but it enables a process which over time leads to best results – […]

How’s (battery) life with Jolla?

Some years ago Nokia conducted a large survey among its customers on what people most liked about Nokia phones. One of the top features turned out to be their unrivaled battery life. Despite the hype around screen resolutions, processor performance and software versions, one of the most important features for a mobile device is simply […]

Jolla and Sailfish Hack Day 2014-03-29

Due to popular demand we are organizing a second event! Would you like to learn how to write a Sailfish OS app and get it into the Jolla store? Or are you already working on a Sailfish app but need help with it? Join us on Jolla and Sailfish Hack Day to code and learn […]

Installing Node.js on SUSE Linux Enterprise

The officially supported collection of software in SUSE Linux Enterprise Linux 11 Service Pack 3 does not contain all conceivable Linux software, but in the Open Build System there are tons of software that is build for SLES 11SP3. Installing these software packages and repositories is of course on your own risk, as they are […]

Top 8 features and priorities for company websites in 2014

What makes a good website in 2014? Here are the top 8 most important priorities a business website must have to be successful and competitive today. 1. Responsive design The share of mobile devices is growing all the time so websites are required to work on devices of all sizes. Responsive design means that the […]

Jolla and Sailfish Hack Day 2014-02-22

Would you like to learn how to write a Sailfish OS app and get it into the Jolla store? Or are you already working on a Sailfish app but need help with it? Join the Jolla and Sailfish Hack Day to code and learn from other SailfishOS and QML enthusiasts. And if you already have […]

Seravo salad spring 2014 schedule

Seravo salad is a monthly event where we discuss relevant subjects related to open source and the Internet, while the attendees enjoy a healthy salad lunch. The event is organized in cooperation with Hub Tampere. This tradition started during the autum of 2013 and the presentations so far have been about our customer cases, social […]