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Seravo blog: Linux and open source – technology and strategy

Posts By: Otto Kekäläinen

Partition like a pro with fdisk, sfdisk and cfdisk

Most Linux distributions ship the hard drive partition tool fdisk by default. Knowing how to use it is a good skill for every Linux system administrator since having to rescue a system that has disk issues is a very common task. If the admin is faced with a prompt in a rescue mode boot, often […]

How to create good SSH keys

A couple years back we wrote a guide on how to create good OpenPGP/GnuPG keys and now it is time to write a guide on SSH keys for much of the same reasons: SSH key algorithms have evolved in past years and the keys generated by the default OpenSSH settings a few years ago are […]

Ubuntu/Gnome on a tablet

Back in 2012 we blogged about Meego/Mer/Nemo, Android for x86 and other Linux operating systems for touchscreens and tablets. Back in the day we also compared Ubuntu Unity vs. Gnome 3 and which would work better as a touch operated system, and Gnome 3 was clearly the more mature system. Since then Ubuntu has dropped Unity […]

Secure and flexible backup server with dm-crypt and btrfs

In our previous article we described an idea setup for a modern server with btrfs for flexibility and redundancy. In this article we describe another kind of setup that is ideal only for a backup server. For a backup server redundancy and high availability are not important, but instead maximal disk space capacity and the […]

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 […]

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 […]

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.

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 […]

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 […]

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 […]

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 […]

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 […]

The Jolla phone – first impressions

The first device running SailfishOS, the successor of Meego, has finally been released. It’s elegant and beautiful both on the outside and inside. It has multiple unique features that makes it unlike any mobile device we’ve seen so far. We have been waiting for Jolla to release their phone for more than a year and […]

SUSE event in Tampere 2013-11-20

What do you need for a secure and well managed Linux environment? SUSE and Seravo presents SUSE Finland and Seravo Oy will have a joint SUSE event in Tampere on Wednesday 2013-11-20 starting at 13:00. The event is in Finnish and more details can be found in the COSS.fi calendar, which is the primary listing […]

Past, present and future of VALO-CD

The VALO-CD is a project with the mission of making it as easy as possible for any average home of office user to start using Free and Open Source Software. Traditionally open source software has been a thing only known by computer enthusiasts while the average Joe has only known about (closed source) software from big […]

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Dual-booting Ubuntu 12.04 and Windows 8 with Restricted Boot

In parallel with the introduction of Windows 8, Microsoft also introduced new hardware requirements to all manufacturers who sell pre-installed Windows 8 computers. As Microsoft Windows still has a monopoly in the desktop and laptop computer market, lots of people who buy computers suffer from a new anti-feature Microsoft introduced: Secure Boot. All Windows 8 […]

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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 […]