http://vyzivus.blogspot.sk/2015/04/fuck-you-google.html
http://vyzivus.blogspot.sk/2016/04/java-sucks.html

New Elastic Volumes Today we are launching a new EBS feature we call Elastic Volumes and making it available for all current-generation EBS volumes attached to current-generation EC2 instances. You can now increase volume size, adjust performance, or change the volume type while the volume is in use. You can continue to use your application while the change takes effect.

Web/app projects these days often have many distributed parts. It's not uncommon for groups to use the right tool for the job. The right tools are often something like the choice below. Redis for queuing, and caching. Elastic Search for searching, and log stash. Influxdb or RRD for timeseries. S3 for an object store. PostgreSQL for relational data with constraints, and validation via schemas. Celery for job queues. Kafka for a buffer of queues or stream processing. Exception logging with PostgreSQL (perhaps using Sentry) KDB for low latency analytics on your column oriented data. Mongo/ZODB for storing documents JSON (or mangodb for /dev/null replacement) SQLite for embedded. Neo4j for graph databases. RethinkDB for your realtime data, when data changes, other parts 'react'. ... For all the different nodes this could easily cost thousands a month, require lots of ops knowledge and support, and use up lots of electricity. To set all this up from scratch could cost one to four weeks of developer time depending on if they know the various stacks already. Perhaps you'd have ten nodes to support. Could you gain an ops advantage by using only PostgreSQL?

PostgreSQL is an open source multi-purpose relational database system which is widely used throughout the world. It is one huge system with the integrated subsystems, each of which has a particular complex feature and works with each other cooperatively. Although understanding of the internal mechanism is crucial for both administration and integration using PostgreSQL, its hugeness and complexity prevent it.

These days it's a pretty bold claim if you say that you invented a sorting algorithm that's 30% faster than state of the art. Unfortunately I have to make a far bolder claim: I wrote a sorting algorithm that's twice as fast as std::sort for many inputs.

jedna pekna prednaska z 2015 len pre pripomenutie, ze fingerprinty ani ine casti biometrie nie je vhodne pouzivat na autentifikaciu

Oracle is massively ramping up audits of Java customers it claims are in breach of its licences - six years after it bought Sun Microsystems. A growing number of Oracle customers and partners have been approached by Larry Ellison's firm, which claims they are out of compliance on Java. The moment you, as an organisation, are delivering something where Java is distributed to end users - something more and more companies are doing by distributing apps through which customers can obtain products and services - that is not general-purpose any more… and Oracle wants to make money from that. Nestudoval som to dokladne, no verim,ze na Slovensko faktury tak skoro prichadzat nebudu :)

paradny writeup use caseov, kedy je vhodne pouzit sqlite DB

If you have studied computing science, then you know how to do complexity analysis. You'll know that iterating through a linked list is O(N), binary search is O(log(N)) and a hash table lookup is O(1). What if I told you that all of the above is wrong?

Brutalna stranka obsahujuca kopec infogragik, linkov, toolov, slideov ohladom performance monitoring a tuning na Linuxe

Workplace stress costs the U.S economy hundreds of billions of dollars per year and is prevalent across all types of organizations and workplaces. If you have adopted or are in the process of adopting the devops methodology and culture, chances are your software developers are burning out as well.

If you've been-there-done-that and you're now building your dream home with your retirement fund, this post really isn't for you. Congratulations are in order. But if, like me, you find yourself getting older and still can't resist the desire to keep coding and building things, then read on.

I've never met a developer who complained about code getting faster or taking up less RAM. In Ruby, memory is especially important, yet few developers know the ins-and-outs of why their memory use goes up or down as their code executes.

"It's what the movie studios want for their products, it's what professional writers want for their work, it's what newspapers want - hell, it's what everyone wants: attention. Attention is power." So wrote the actor James Franco in an article on the selfie phenomenon in The New York Times last winter.

It all sounds so straightforward: Put your code up on GitHub or start/join a project at the Apache Software Foundation (ASF), build a community of like-minded individuals, start a company, take in some funding, and then IPO. Or maybe not. One thing is certain: Running an open source company has unique challenges and opportunities.

http://sakurity.com/blog/2015/02/28/openuri.html - "Ruby: Using open-uri? Check your code - you're playing with fire! "
http://blog.honeybadger.io/ruby-security-tutorial-and-rails-security-guide/ "The Inadequate Guide to Rails Security"
https://www.omniref.com/ruby/2.2.0/symbols/Proc/yield?#annotation=4087638&line=711 "Why blocks make Ruby methods 439% slower"
https://androidsecuritywiki.com/ "Android Security Wiki"
https://heipei.github.io/2015/02/26/SSH-Agent-Forwarding-considered-harmful/ SSH Agent Forwarding considered harmful
https://blog.shodan.io/duplicate-ssh-keys-everywhere/ "Duplicate SSH Keys Everywhere"
http://www.root.cz/clanky/postrehy-z-bezpecnosti-podvodne-e-maily-este-nedali-posledne-slovo/ - kazdotyzdenne postrehy z bezpecnosti na root.cz"

With the new Linux 4.0 kernel, you'll need to reboot Linux less often than ever. Uz nikdy viac reboot :)

Testing distributed systems under hard failures like network partitions and instance termination is critical, but it's also important we test them under less catastrophic conditions because this is what they most often experience. Comcast is a tool designed to simulate common network problems like latency, bandwidth restrictions, and dropped/reordered/corrupted packets. It works by wrapping up some system tools in a portable(ish) way. On BSD-derived systems such as OSX, we use tools like ipfw and pfctl to inject failure. On Linux, we use iptables and tc. Comcast is merely a thin wrapper around these controls.

There's no such thing as an anonymous programmer: your coding style can unmask you, according to research led by Drexel University Comp. Sci. PhD student Aylin Caliskan-Islam. In work that has serious implications for anyone believing their open source project contributions are anonymous, the researchers find that as many as 95 per cent of contributors to a decent-sized code base can be identified.

Dozens of facts about the SSH protocol and why we should use it for more things. A few weeks ago, I wrote ssh-chat. The idea is simple: You open your terminal and type, $ ssh chat.shazow.net Unlike many others, you might stop yourself before typing "ls" and notice - that's no shell, it's a chat room!