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Posts Tagged: howto

The perfect Btrfs setup for a server

Btrfs is probably the most modern filesystem of all widely used filesystems on Linux. In this article we explain how to use Btrfs as the only filesystem on a server machine, and how that enables some sweet capabilities, like very resilient RAID-1, flexible adding or replacing of disk drives, using snapshots for quick backups and […]

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 […]

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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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”. […]

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 […]

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 […]

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 […]

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 – […]

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 […]

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 […]

Easy HTML5 quality assurance tools

There are plenty of free tools available for HTML5 quality validation and testing that can and should be used by anybody who produces or buys software products. Unlike traditional native binary-only apps, with HTML5 apps the user has the ability to access the source code due the technical structure of how HTML5 apps are composed. […]

Tips to optimize images for faster loading websites

For a multitude of reasons ranging from user conversion rate to search engine ranking, it is important for web sites to load fast. The first rule of thumb to having fast loading pages is to keep the amount of data the users need to transfer small. The smaller the web page file and its dependencies […]

Optimizing web server performance with Nginx and PHP

Who would not want to have a fast service? No matter how good your web service is, if it takes 5 seconds to load a page, people will dislike using it. Even search engines dislike slow servers and decrease their ranking. Faster is always better. In our article a few months ago we asked what […]

Free Your Android phone (and upgrade to the latest Android version)!

Most Android phone manufacturers provide operating system upgrades, so you can run the latest version of Android even with an older smart phone. With closed software phones like iPhone this is not possible, since Apple wants to force its customers into always buying a new phone. However not all Android phone manufacturers provide upgrades, or […]

Installing Android-x86 4.0 on the ExoPC (WeTab)

The official Android project only releases versions for the ARM platform, but there is an unofficial porting project for the Intel x86 platform called Android-x86. Using this version you can in theory install Android on any home computer lying around. In practice however you need to consider what kind of components your device has and […]

Git training with Devaamo

On November 28th Otto Kekäläinen of Seravo ran a Git training session on request by the Tampere-based developer community Devaamo ry. Git is great revision management system authored by Linus Torvalds, and in last two years its popularity has exploded because it is so great, but certainly not because it would be easy to use, so there […]

Trying out Meego offspring Mer and Nemo on ExoPC (WeTab)

Even though Steven Elop, Intel and the Linux Foundation killed the Meego project, the code base is not dead. In October 2011 the Mer Project was forked out of Meego and quickly attracted the development community that had grown distrust in the original Meego project, for very obivious and good reasons, of course. In the […]

Make your Android phone last a week without recharging

Modern touch screen smart phones are great and enables you to do almost anything, but there is one feature that older mobile phones are still better at: battery life. I imagine most smart phone users recharge their devices every other day or so, which is fine as long you have easy access to electricity. However, […]

Google Navi for Android in Finland

For some reason, which we where unable to find information on, Google hasn’t published their navigation app for Android in Finland. However it does exist, and it works wonderfully. To install the Google Navi app, you must first uninstall your current Maps app, and then install the modified Maps app with Navi enabled, which can […]