The Hostinger Monitoring Mystery Revealed

forex no deposit bonus

Back when Hostinger was still quite a small company, only Nagios, Cacti and Ganglia existed at that time in the market as open source monitoring tools. They’re less known now, but Nagios and Cacti are still in a development cycle, even today.

Even though no automation tools existed. Bash + Perl did the job. If you want to scale your team and yourself, automation should never be ignored. No automation – more human manual work involved.

We started out with around 150 physical servers. To compare, to this day we have around 2000 servers including internal purpose VM’s and physical boxes.

All of the aforementioned tools (Nagios, Cacti, and Ganglia) mostly used the SNMP protocol, which in my opinion is horrible.

For networking gear, SNMP is still usable worldwide, but currently, with white-box switches, this becomes bit by bit totally unnecessary.

Instead, run _node_exporter_ or any other exporter inside the switch and expose whatever you need with a human-readable format. Beautiful is better than ugly, right?

We use CumulusOS which is in our case mostly x86 architecture, thus it is absolutely not a problem to run any kind of Linux stuff.

In 2015 when we started automating everything that can be automated, we introduced the Prometheus ecosystem. In the beginning, we had a single monitoring box where Alertmanager, Pushgateway, Grafana, Graylog, and rsyslogd were running there.

During the transition period from the old monitoring stack (NCG – Nagios/Cacti/Ganglia) we used both systems and finally, we rely only on Prometheus.

The new setup improved our resolution time from 5 minutes to 15 seconds, which allows us to have a fine-grained, deep analysis. Even MTTD (Mean Time To Detect) was reduced by a factor of 4.

We have about 25 community metric exporters + some custom written ones like _lxc_exporter_ in at our disposal. Mostly we expose custom business-related metrics using textfile collector.

We also evaluated the TICK (Telegraf/InfluxDB/Chronograf/Kapacitor) stack as well, but we were not happy with it, because of limited functionality at that time and Prometheus looked many ways simpler and matured to implement.

Later in 2017, we started using PagerDuty for paging. We have a weekly 24/7 on-call rotation. In our case, we rotate every fifth or sixth week only – quite comfortable. But we are looking forward to eliminating this duty as a whole. Instead, we will take care of the service we own, because the owner knows the problems best.

The previous year as we grew up our infrastructure N times since 2015 the main bottleneck become Prometheus and Alertmanager. Our Prometheus eats about ~2TB of disk space. Hence, if we restart or push the node using knife we miss monitoring data for a while. Prometheus restart takes about 10-15 minutes. Not acceptable.

Another problem is that if a single location is down we miss monitoring data as well. Thus we decided to implement a highly available monitoring infrastructure: two Prometheus nodes, and two Alertmanagers in separate continents.

New Hostinger Monitoring Infrastructure
Hostinger Monitoring Infrastructure

Our main visualization tool is Grafana. It’s critically important that Grafana could query the backup Prometheus node if the primary is down. This is easy as that – put an HAProxy in front and accept connections locally.

backend prometheus
server prometheus_2a02_4780_9__1234 2a02:4780:9::1234:9090 check fall 3 rise 2
server prometheus_2a02_4780_bad_c0de__1234 2a02:4780:bad:c0de::1234:9090 check fall 3 rise 2 backup
option httpchk GET /graph
http-check expect rstatus (2|3)[0-9][0-9]

Did you ask about the performance of any middleware? We talk about single digit milliseconds – all good.

Another problem is how can we prevent users (developers and other internal staff) from abusing dashboards overloading the Prometheus nodes. Or the backup node if the primary one is down – thundering herds problem.

To achieve the desired state we gave a chance to Trickster. This speeds-up dashboard loading times incredibly. It caches time series. In our case cache sits in memory, but there are more choices where to store it. Even when the primary node goes down and you refresh the dashboard, Trickster won’t query the second node for the time series which it has cached in its memory. Trickster sits between Grafana and Prometheus. It just talks with the Prometheus API.

Prometheus nodes are independent while Alertmanager nodes form a cluster. If both Alertmanagers see the same alert they will deduplicate and fire once instead of multiple times.

We have plans to run plenty of _blackbox_exporters_ and monitor every Hostinger client’s website because anything that cannot be monitored cannot be accessed.

The post The Hostinger Monitoring Mystery Revealed appeared first on Hostinger Blog.

no deposit bonus forex

Leave a Reply

Your Name (required)

Your Email (required)

Your Message

BonusMin. DepositMax. ReturnsRating
ayrex$10,000$20090%Rating Ayrex Options Review
$10,000$581%broker Rating Freestyle Review
Finmax$10,000$20090% FiNMAX Review
StockPair$20,000$585%broker Rating Falcon Finance Review
24optionUnlimited$25089%Top Binary Options Brokers Rating 24option Review

To invest with binary options you will work with an investment broker who is licensed to work in this field. Working with your broker, you will identify which asset you want to buy an option on, how much you want to invest and when the option will expire. Once the option is placed, you simply watch the trading activity on that asset to see if your prediction was accurate or not.

Binary options are one of the most popular trading choices for investors today, due in large part to their simplicity and the fact that you always know all the risks and payoffs ahead of time.

  • regulated: we promote only regulated brokers whose business models and marketing practices are checked by relevant government authorities.
  • special features: here we list all the important features that a broker offers. These are usually listed as perks offered trough various account types which bring different levels of service, depending on the minimum funds deposited
  • bonuses: almost every Top Binary Options Brokers offers these rewards that increase trading potential. Fair Binary Options also lists terms and conditions that come with the bonus money so traders always know how will these affect their trading efficiency.
  • the best binary trading platforms reviewed: we review the software that makes trading possible. There are several big providers, such as SpotOption, TechFinancials, Tradologic, MarketsPuls… Every software has some special characteristics, and not every software is suited for every trader
  • assets: Fair Binary Options review provides basic info on the amount of assets available for trading
  • customer support: we chat with the customer support to test how the broker has set up the help desk that should support traders. This is the best way to assess the service.
  • payments: we list all the payment options available by the Top Binary Options Brokers, list minimum deposit requirement
  • withdrawals: we warn traders if withdrawal requirements are too high, or if it takes a long time to get the money back.
    • Keras - self-learning NEURAL networks for
      Stock market forecasting
      Get it FREE

      *number of participants is limited

      Customer Testimonials

      Fellas what broker is legit in States ? binary options binary options broker USA?