Welcome!

Python Authors: AppDynamics Blog, Liz McMillan, Pat Romanski, Donald Meyer, Elizabeth White

Blog Feed Post

How I built a monitor for RabbitMQ

When you are going to monitor your engine, you probably try first to find some tool that can do it. Very likely, of course, that tool should be able to handle monitoring online and to notify you when the health of your engine is starting to go bad. There are already several well-known and widespread online monitoring tools available for many systems. Super! But what if I try to find a suitable tool for my specific application and… ohh, failure – I cannot find what I need. Unfortunately, it’s also very likely that no one can even suggest a suitable tool. What can I do in such a situation? Probably try to do it myself. Who can help me? You’ve probably already guessed that I am talking about Monitis.  You may ask “why Monitis?”  Because Monitis suggests Monitis Open API, and that gives you a chance to build any monitoring tool yourself. In line with Monitis slang, such a monitor has been named the custom monitor.

But let’s cease the generic talk and get back to my story.

Recently, I had to use RabbitMQ server in one of my projects, and naturally I had a wish to monitor it; just to measure data that I want to monitor. RabbitMQ contains a nice plugin named RabbitMQ Management that in fact provides monitoring of RabbitMQ via any browser (thanks to the embedded WEBUI). Well, it is undoubtedly good, but I don’t want to sit whole days next to the monitor waiting for a problem to come in. I want to monitor online, to have the possibility to go back in time by viewing the monitoring history and, why not, to get a notification on my mobile while having a beer in the bar. I think every admin dreams of such a life.

Well, since I use an Ubuntu server I have decided to implement my custom monitor as Bash script to avoid any unnecessary dependencies and to take into account that the Bash script wrapper for Monitis API  is already implemented.

First of all I have to install RabbitMQ server. The easiest way to do this is to download the “deb” package from the original RabbitMQ site and install it by using the following command:

 

sudo dpkg -i rabbitmq-server_2.8.x_all.deb

 

So far so good. Next step – enabling the RabbitMQ Management HTTP API  that allows, in addition, getting necessary information by using REST technology. The management plugin has been included in the RabbitMQ distribution since version 2.8.1. To enable it, use the following command:

 

sudo rabbitmq-plugins enable rabbitmq_management

 

Please note that for older versions you have to install this plugin separately.

That’s all. Now I can use the RabbitMQ server by writing the following command to control RabbitMQ:

 

sudo /etc/init.d/rabbitmq-server {start|stop|status|rotate-logs|restart}

 

For instance, RabbitMQ server status will be shown as depicted below:

 

 

All is okay up to now. Well, after some investigation I have decided to measure the following available metrics:

  •  osd_pr – The percentage of open socket descriptors RabbitMQ server to the allowed maximum number of open sockets by process.
  •  ofd_pr – The percentage of open file descriptors RabbitMQ server to the allowed maximum number of open files by process.
  •  cpu_usage – the percentage of cpu usage by RabbitMQ server.
  •  mem_usage – the percentage of memory usage by RabbitMQ server.
  •  msg_in_queue – the number of messages that are still in the queue.
  •  timeout – queues timeout in seconds.
  •  pub_rate – Average value of total published messages into queues per second.
  •  from_client_rate – Total inbound throughput value estimated in Kbytes per second.
  •  to_client_rate – Total outbound throughput value estimated in Kbytes per second.
  •  get_rate – Average value of total got messages from queues per second.
  •  status – the evaluation of health status of RabbitMQ server (OK, IDLE, NOK, FAIL)

 

The health status of RabbitMQ should be evaluated as ‘NOK’ when at least one of the following events is detected:

  • The percentage of open file descriptors (ofd_pr) exceeds 90%
  • The percentage of open socket descriptors (osd_pr) exceeds 90%
  • The percentage of used Erlang processes to available Erlang processes exceeds 90%
  • The percentage of memory usage (mem_usage) exceeds 95%
  • The percentage of cpu usage (cpu_usage) exceeds 95%
  • There are messages in the queue (msg_in_queue > 0)

The health status ‘FAIL’ should be generated when RabbitMQ server is unavailable for some reason and the health status ‘IDLE’ should be generated when RabbitMQ server isn’t receiving any messages from clients.

It seems that is all I want for now. Okay, I developed quite quickly such a Bash Script for monitoring and got the following set of files:

monitis_api.sh         Monitis API wrapper implementation

monitis_util.sh        Utilities function set

monitis_global.sh      Monitis API wrapper global variables

monitis_constant.sh    Monitis API constants

rabbitmq_monitor.sh    RabbitMQ custom monitor implementation

monitor_constant.sh    RabbitMQ monitor constants

rmqmon_start.sh        Main executable script

ticktick.sh            Bash JSON parser

Note that I have really developed only the “rabbitmq_monitor.sh” script. The other scripts were simply adapted. Please also notice that I have to use the third party open source JSON parser (to allow processing JSON in bash script) because RabbitMQ Management HTTP API responses are in the JSON form.

 

Well, now it’s time for testing.

I have prepared two clients on JavaScript (Node.js) and Java for connecting to RabbitMQ. In addition, the load simulator was prepared in a way that is intended to generate quite a big load for processing.

So, I have run the monitor and simulator and after some time opened my dashboard in Monitis. The tests showed nice results which I saw in the Monitis dashboard:

 

Beside this, double-clicking on any line leads to an alternate view which shows additional data about the RabbitMQ state at that moment.

 

Eventually, you can also see a graphical representation of your data:

 

I built a rule for notification by using Monitis dashboard features and, satisfied, went to rest.

Perfect, let me summarize. I have obtained in a very short time the desired tool and moreover it can send me a notification any time of day about any troubling situation in my RabbitMQ engine.

Finally, I have uploaded the monitor I created into GitHub where you can find more details about it.

 

 

 

Share Now:del.icio.usDiggFacebookLinkedInBlinkListDZoneGoogle BookmarksRedditStumbleUponTwitterRSS

Read the original blog entry...

More Stories By Hovhannes Avoyan

Hovhannes Avoyan is the CEO of PicsArt, Inc.,

@ThingsExpo Stories
Smart Cities are here to stay, but for their promise to be delivered, the data they produce must not be put in new siloes. In his session at @ThingsExpo, Mathias Herberts, Co-founder and CTO of Cityzen Data, will deep dive into best practices that will ensure a successful smart city journey.
Businesses are struggling to manage the information flow and interactions between all of these new devices and things jumping on their network, and the apps and IT systems they control. The data businesses gather is only helpful if they can do something with it. In his session at @ThingsExpo, Chris Witeck, Principal Technology Strategist at Citrix, will discuss how different the impact of IoT will be for large businesses, expanding how IoT will allow large organizations to make their legacy ap...
Adobe is changing the world though digital experiences. Adobe helps customers develop and deliver high-impact experiences that differentiate brands, build loyalty, and drive revenue across every screen, including smartphones, computers, tablets and TVs. Adobe content solutions are used daily by millions of companies worldwide-from publishers and broadcasters, to enterprises, marketing agencies and household-name brands. Building on its established design leadership, Adobe enables customers not o...
Major trends and emerging technologies – from virtual reality and IoT, to Big Data and algorithms – are helping organizations innovate in the digital era. However, to create real business value, IT must think beyond the ‘what’ of digital transformation to the ‘how’ to harness emerging trends, innovation and disruption. Architecture is the key that underpins and ties all these efforts together. In the digital age, it’s important to invest in architecture, extend the enterprise footprint to the cl...
Just over a week ago I received a long and loud sustained applause for a presentation I delivered at this year’s Cloud Expo in Santa Clara. I was extremely pleased with the turnout and had some very good conversations with many of the attendees. Over the next few days I had many more meaningful conversations and was not only happy with the results but also learned a few new things. Here is everything I learned in those three days distilled into three short points.
SYS-CON Events announced today that Numerex Corp, a leading provider of managed enterprise solutions enabling the Internet of Things (IoT), will exhibit at the 19th International Cloud Expo | @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Numerex Corp. (NASDAQ:NMRX) is a leading provider of managed enterprise solutions enabling the Internet of Things (IoT). The Company's solutions produce new revenue streams or create operating...
24Notion is full-service global creative digital marketing, technology and lifestyle agency that combines strategic ideas with customized tactical execution. With a broad understand of the art of traditional marketing, new media, communications and social influence, 24Notion uniquely understands how to connect your brand strategy with the right consumer. 24Notion ranked #12 on Corporate Social Responsibility - Book of List.
Why do your mobile transformations need to happen today? Mobile is the strategy that enterprise transformation centers on to drive customer engagement. In his general session at @ThingsExpo, Roger Woods, Director, Mobile Product & Strategy – Adobe Marketing Cloud, covered key IoT and mobile trends that are forcing mobile transformation, key components of a solid mobile strategy and explored how brands are effectively driving mobile change throughout the enterprise.
As ridesharing competitors and enhanced services increase, notable changes are occurring in the transportation model. Despite the cost-effective means and flexibility of ridesharing, both drivers and users will need to be aware of the connected environment and how it will impact the ridesharing experience. In his session at @ThingsExpo, Timothy Evavold, Executive Director Automotive at Covisint, will discuss key challenges and solutions to powering a ride sharing and/or multimodal model in the a...
In his general session at 18th Cloud Expo, Lee Atchison, Principal Cloud Architect and Advocate at New Relic, discussed cloud as a ‘better data center’ and how it adds new capacity (faster) and improves application availability (redundancy). The cloud is a ‘Dynamic Tool for Dynamic Apps’ and resource allocation is an integral part of your application architecture, so use only the resources you need and allocate /de-allocate resources on the fly.
In this strange new world where more and more power is drawn from business technology, companies are effectively straddling two paths on the road to innovation and transformation into digital enterprises. The first path is the heritage trail – with “legacy” technology forming the background. Here, extant technologies are transformed by core IT teams to provide more API-driven approaches. Legacy systems can restrict companies that are transitioning into digital enterprises. To truly become a lea...
SYS-CON Events announced today that Roundee / LinearHub will exhibit at the WebRTC Summit at @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. LinearHub provides Roundee Service, a smart platform for enterprise video conferencing with enhanced features such as automatic recording and transcription service. Slack users can integrate Roundee to their team via Slack’s App Directory, and '/roundee' command lets your video conference ...
Web Real-Time Communication APIs have quickly revolutionized what browsers are capable of. In addition to video and audio streams, we can now bi-directionally send arbitrary data over WebRTC's PeerConnection Data Channels. With the advent of Progressive Web Apps and new hardware APIs such as WebBluetooh and WebUSB, we can finally enable users to stitch together the Internet of Things directly from their browsers while communicating privately and securely in a decentralized way.
"My role is working with customers, helping them go through this digital transformation. I spend a lot of time talking to banks, big industries, manufacturers working through how they are integrating and transforming their IT platforms and moving them forward," explained William Morrish, General Manager Product Sales at Interoute, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York City, NY.
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, wh...
What are the new priorities for the connected business? First: businesses need to think differently about the types of connections they will need to make – these span well beyond the traditional app to app into more modern forms of integration including SaaS integrations, mobile integrations, APIs, device integration and Big Data integration. It’s important these are unified together vs. doing them all piecemeal. Second, these types of connections need to be simple to design, adapt and configure...
What happens when the different parts of a vehicle become smarter than the vehicle itself? As we move toward the era of smart everything, hundreds of entities in a vehicle that communicate with each other, the vehicle and external systems create a need for identity orchestration so that all entities work as a conglomerate. Much like an orchestra without a conductor, without the ability to secure, control, and connect the link between a vehicle’s head unit, devices, and systems and to manage the ...
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, will compare the Jevons Paradox to modern-day enterprise IT, e...
SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management solutions, helping companies worldwide activate their data to drive more value and business insight and to transform moder...
SYS-CON Events has announced today that Roger Strukhoff has been named conference chair of Cloud Expo and @ThingsExpo 2016 Silicon Valley. The 19th Cloud Expo and 6th @ThingsExpo will take place on November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. "The Internet of Things brings trillions of dollars of opportunity to developers and enterprise IT, no matter how you measure it," stated Roger Strukhoff. "More importantly, it leverages the power of devices and the Interne...