Developers Club geek daily blog

How many actually costs traffic gigabyte? (In the worst case)

1 year, 9 months ago


Development of the Internet and various cloud services leads including to emergence of interesting questions. In 2011 providers of the USA and Canada (ISP) were going to set a monthly limit of consumption of Internet traffic for users. For exceeding of this volume it is necessary to pay in addition at the rate of $1 for gigabyte. This their desire provokes polemic about that how many actually there is (and has to cost) an Internet access?

The founder of the HowStuff Works project Marshall Breyn (Marshall Brain) wrote in the blog material with calculations of cost of access to a network on the example of the most expensive African Internet in the world.

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The general capacity of the LeaseWeb networks reached 5 Tbit / with: instant dedicated servers in the Netherlands from $39 only week

1 year, 9 months ago
We hurry the general capacity of the LeaseWeb networks in a data-center of a premium class of EvoSwitch in which we offer dedicated servers in lease will share joyful news, in the 2015th year, reached value 5 of Tbit / page. It is a lot of or a little? Why over 60 000 subscribers selected this data-center for the projects in spite of the fact that exist more profitable at the offer price of low-costers in other countries? The reasons a set, in particular — we, a hosting provider which applies an individual approach to each subscriber, but nevertheless, in addition to us, it:

— loyal legislation of the Netherlands;
EvoSwitch premium class data-center;
— LeaseWeb — provider with whom we and our subscribers successfully cooperate many years we are their bonus partners and thanks to long-term cooperation we can offer terms better, than in a data-center directly, at the same time in every possible way caring for you in an individual order (on a site the selected engineer is always available, requests of our subscribers are reviewed in priority, in 90% of cases technical support is given by our administrators far off without the need for carrying out physical works with the server);
— a network of delivery of a traffic to your visitors with improbable connectivity (minimum a ping and maximum speed on a flow);
— the general capacity of a network 5 of Tbit / with;
— 2,5 Tbit / from a traffic are generated by subscribers of a data-center;
— 58 points of presence worldwide;
— inclusions in 36 points of an exchange of a traffic in more, than 20 countries;
— 4213 peer-to-peer connections to Internet service providers of different level.

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The logrotate setup + access for collecting of logs on SFTP

1 year, 9 months ago
I had a task: to configure compression of logs of the DNS Unbound server, with a possibility of convenient collecting of these backups in a collector. Also it was required to limit access rights that from a collector it was possible to come only into a directory where backups of logs are stored. Carried out the specified actions on CentOS 7 Minimal and CentOS 6.6 Minimal.

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Stories from practice of optimization of a network

1 year, 9 months ago
Hi! I with colleagues optimize the available channels. We are constantly confused to optical sealants, to engineers-cablemen, in general, to loaders.



And our work is an analysis of a stack of protocols and its complete rearrangement under features of the channel, setup of the optimum sizes of a frame, collecting of several packets for the channel with big latency in one, a deduplication, normal compression, analysis of SSL and reassembly with the same certificate. It is solved in the simplest case installation of special iron on the accepting and transmitting end. As it is necessary to reach each point, we also work as exit engineers. And, as at any exit engineers, stories at us the sea. Below I will tell a little, I will only change a number of minor circumstances that it was impossible to recognize the customer.

For example, there are night works in very large shop. The administrator of the customer and our engineer came per hour nights into server, work. The engineer left in a toilet, returned. In a couple of minutes – knock at a door. Open — and at once GBR with automatic machines, at once legs for the body, a muzzle in a floor and in handcuffs flies.

Then approach police and main on shop. Main assesses a situation and with authority declares:
— I know this, this is our administrator. And I do not know this. Take away.

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Opening of a new data-center of Hydro66

1 year, 9 months ago
Opening of a new data-center of the British provider of a collocation of Hydro66 took place. All IT infrastructure of DPC of 1 000 sq.m. will work at the hydroelectric power from the nearest hydroelectric power station (500 m) which is near the Swedish city Boden. According to designers the similar choice of power sources will help to reduce costs for a collocation in comparison with platforms of Europe and Great Britain. Also it will turn out to reduce costs at the expense of a location. The climate of Sweden rather cold will also allow to refuse mechanical and chemical methods of cold supply.



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Why calculation of pertsentily works not as you expect?

1 year, 9 months ago
Often clients ask us about a p99-metrics (the 99th pertsentil).

It is definitely reasonable request and we are going to add similar functionality to VividCortex (I will tell about it later). But at the same time, when clients ask about it, they mean something absolutely certain — something that can be a problem. They ask not the 99th pertsentil on some metrics, they ask a metrics on the 99th pertsentilyu. This commonplace for such systems as Graphite, but all this yields not that result which from such systems is expected. It is a post will tell you that, perhaps, you have incorrect representations about pertsentil, about exact degree of your delusions and about what all of you can make correctly in this case.

(It is transfer of article which was written by Baron Schwartz.)

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Cloudy call center in the cloudless region. Extraordinary New Year's adventures of ITooLabs on the Balkans

1 year, 9 months ago
Traditionally, before the Newest Year, it is accepted to write about results of the year leaving about plans for year forthcoming, to congratulate clients, partners and colleagues on holidays. We do not want to break the developed tradition and today we publish a post which for certain will create the necessary and correct mood at readers of the blog ITooLabs. We want to tell about how there is a cloudy business of our foreign partner, the Balkan telecom operator of VoxNet as work of the Balkan colleagues looks and as the ITooLabs platform helped to automate the big European call center working at the entering and outgoing calls. At our request the Macedonian colleagues made many photo and even wrote a New Year's video congratulation.


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Work as "IT astronaut": as we, engineers, visit bears and seals

1 year, 9 months ago


"Devil. Start the astronaut" — the phrase with which our most difficult departures begin. I remember, for last Christmas approximately so we also went to repair ABHM of one public institution. The machine froze, and the data-center from it was heated. From that, we will repair or not, depended as elderly people over all country will spend New Year (with pension or without). Rescued, but work was still that. Then it was calculated and added. Pension.

Since then we are also called astronauts because we work in the block heater. At least a half of departures is at most an hour on picking and week somewhere where instead of Habr only bears. And even money costs nothing.

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Why to you the best practicians of management of IT infrastructure?

1 year, 9 months ago
As you work: instinctively or on science? Probably, nobody will give a definite answer: work in the IT sphere assumes a combination of experience and technologies, exact instructions, regulations and beautiful, even talented, engineering finds. Anyway, experience solves. And how about others experience? In the world the set of the codes and rules intended for work of IT services which are integrated by concept with a marketing shade — "the best practicians" is created. It is the experience created by a set of the companies and allowing it is quite simple to solve standard problems.


In a post we will tell that such ITIL, ITSM, CobiT, DevOps as they are connected and why even system administrators of the small companies have to know something about these abbreviations.

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Familiar stranger. What is Bitriks24?

1 year, 9 months ago
If you are puzzled with search of CRM, then at numerous forums will inevitably face mentioning the Bitriks24 and its systems discussion. There are enough supporters and opponents: someone claims that it is not CRM at all (that the truth), someone reduces all functionality of system to an enterprise portal, someone remembers about 12 free users. As well as in any other company, employees of Bitriks fixedly monitor for withdrew also discussions of our products in a network. Sometimes we are surprised by the separate comments and even tales connected with Bitriks24. But to all there is a limit. We will consistently tell that such Bitriks24 actually as it can integrate the company and help any business in our blog on Habré.


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