|By Hovhannes Avoyan||
|May 10, 2012 10:03 AM EDT||
Last time we mentioned two fundamental principles while monitoring any object:
1. The monitor should collect as much important information as possible that will allow to accurately evaluate the health state of an object.
2. The monitor should have little to no effect on the activity of the object.
Normally, it is necessary to add couple lines in your existing Node.js server code to activate the monitor-plugin:
var monitor = require('monitor');// insert monitor module-plugin
var server = … // the definition of current Node.js server
monitor.Monitor(server); //add server to monitor
Now the monitor will begin collecting and measuring data. The monitor-plugin has an embedded simple HTTP server that sends accumulated data by request and should correspond (in current implementation) to the following pattern
10010 – the listen port of monitor-plugin (configurable)
‘node_monitor’ – the pathname keyword
‘action=getdata’ – command for getting collected data
‘access_code’ – the specially generated access code that changes for every session
Please notice that monitis-plugin server (in current implementation) listens the localhost only. This and usage of the security access code for every session gives enough security while monitoring. More detailed information can be found along with implemented code in the github repository.
Server monitoring metrics
There are a largely standard set of metrics which can be used to monitor the underlying health of any server.
* CPU Usage describes the level of utilisation of the system CPU(s) and is usually broken down into three states.
o IO Wait – indicates the proportion of CPU cycles spent waiting for IO (disk or network) events. If you experience large IO Wait proportions, it can indicate that your disks are causing a performance bottleneck.
o System – indicates the proportion of CPU cycles spent performing kernel-level processing. Generally you will find only a small proportion of your CPU cycles are spent on system tasks, Hence if you see spikes it could indicate a problem.
o User – indicates the proportion of CPU cycles spent performing user instigated processing. This is where you should see the bulk of your CPU cycles consumed; it includes activities such as web serving, application execution, and every other process not owned by the kernel.
o Idle – indicates the spare CPU capacity you have – all the cycles where the CPU is, quite literally, doing nothing.
* Load Average is a metric that indicates the level of load that a server is under at a given point in time. Usually evaluated as number of requests per second.
* RAM usage by server is broken down usually into the following parts.
o Free – the amount of unallocated RAM available. Linux systems tend to keep this as low as possible; and do not free up the system’s physical RAM until it is requested by another process.
o Inactive – RAM that is in-use for buffers and page caching, but hasn’t been used recently so will be reclaimed first for use by a running process.
o Active – RAM that has been used recently and will not be reclaimed unless we have insufficient Inactive RAM to claim from. In Linux systems this is generally the one to keep an eye on. Sudden, rapid increases signal a memory hungry process that will soon cause VM swapping to occur.
* The server uptime is a metric showing the elapsed time since the last reboot. Non-linear behavior of the server uptime line indicates that the server was rebooted somehow.
* Throughput – the amount of data traffic passing through the servers’ network interface is fundamentally important. It is usually broken down into inbound and outbound throughput and normally measured as average values for some period by kbit or kbyte per sec.
* Server Response time is defined as the duration from receiving a request to sending a response. Normally, it should not exceed reasonable timeout (usually this depends on the complexity of processing) but should be as little as possible. Usually, the average and peak response time is evaluated for some time period.
* The count of successfully processed requests is evaluated as the percentage of responses with 2xx status codes (success) to requests during observing time. This value should be as close as possible to 100%.
We have used part of these metrics and added some specific statistics that are important for our task (e.g. client platform, detailed info for response codes, etc.)
The results below were obtained on a Node.js server equipped with the monitor described above on a Debian6-x64. The server listens on HTTP (81) and HTTPS (443) ports and does not have a large load.
The data can be shown in graphical view too.
Cloud computing delivers on-demand resources that provide businesses with flexibility and cost-savings. The challenge in moving workloads to the cloud has been the cost and complexity of ensuring the initial and ongoing security and regulatory (PCI, HIPAA, FFIEC) compliance across private and public clouds. Manual security compliance is slow, prone to human error, and represents over 50% of the cost of managing cloud applications. Determining how to automate cloud security compliance is critical...
Nov. 27, 2015 06:00 PM EST Reads: 412
We all know that data growth is exploding and storage budgets are shrinking. Instead of showing you charts on about how much data there is, in his General Session at 17th Cloud Expo, Scott Cleland, Senior Director of Product Marketing at HGST, showed how to capture all of your data in one place. After you have your data under control, you can then analyze it in one place, saving time and resources.
Nov. 27, 2015 04:00 PM EST Reads: 172
Today air travel is a minefield of delays, hassles and customer disappointment. Airlines struggle to revitalize the experience. GE and M2Mi will demonstrate practical examples of how IoT solutions are helping airlines bring back personalization, reduce trip time and improve reliability. In their session at @ThingsExpo, Shyam Varan Nath, Principal Architect with GE, and Dr. Sarah Cooper, M2Mi’s VP Business Development and Engineering, explored the IoT cloud-based platform technologies driving t...
Nov. 27, 2015 02:00 PM EST Reads: 410
As organizations shift towards IT-as-a-service models, the need for managing & protecting data residing across physical, virtual, and now cloud environments grows with it. CommVault can ensure protection & E-Discovery of your data - whether in a private cloud, a Service Provider delivered public cloud, or a hybrid cloud environment – across the heterogeneous enterprise.
Nov. 27, 2015 01:00 PM EST Reads: 171
In recent years, at least 40% of companies using cloud applications have experienced data loss. One of the best prevention against cloud data loss is backing up your cloud data. In his General Session at 17th Cloud Expo, Sam McIntyre, Partner Enablement Specialist at eFolder, presented how organizations can use eFolder Cloudfinder to automate backups of cloud application data. He also demonstrated how easy it is to search and restore cloud application data using Cloudfinder.
Nov. 27, 2015 01:00 PM EST Reads: 153
The Internet of Things (IoT) is growing rapidly by extending current technologies, products and networks. By 2020, Cisco estimates there will be 50 billion connected devices. Gartner has forecast revenues of over $300 billion, just to IoT suppliers. Now is the time to figure out how you’ll make money – not just create innovative products. With hundreds of new products and companies jumping into the IoT fray every month, there’s no shortage of innovation. Despite this, McKinsey/VisionMobile data...
Nov. 27, 2015 12:00 PM EST Reads: 464
Internet of @ThingsExpo, taking place June 7-9, 2016 at Javits Center, New York City and Nov 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 18th International @CloudExpo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo New York Call for Papers is now open.
Nov. 27, 2015 12:00 PM EST Reads: 542
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York and Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty ...
Nov. 27, 2015 11:45 AM EST Reads: 536
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.
Nov. 27, 2015 11:00 AM EST Reads: 312
DevOps is about increasing efficiency, but nothing is more inefficient than building the same application twice. However, this is a routine occurrence with enterprise applications that need both a rich desktop web interface and strong mobile support. With recent technological advances from Isomorphic Software and others, rich desktop and tuned mobile experiences can now be created with a single codebase – without compromising functionality, performance or usability. In his session at DevOps Su...
Nov. 27, 2015 10:45 AM EST Reads: 383
As organizations realize the scope of the Internet of Things, gaining key insights from Big Data, through the use of advanced analytics, becomes crucial. However, IoT also creates the need for petabyte scale storage of data from millions of devices. A new type of Storage is required which seamlessly integrates robust data analytics with massive scale. These storage systems will act as “smart systems” provide in-place analytics that speed discovery and enable businesses to quickly derive meaningf...
Nov. 27, 2015 10:45 AM EST Reads: 397
SYS-CON Events announced today that Alert Logic, Inc., the leading provider of Security-as-a-Service solutions for the cloud, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Alert Logic, Inc., provides Security-as-a-Service for on-premises, cloud, and hybrid infrastructures, delivering deep security insight and continuous protection for customers at a lower cost than traditional security solutions. Ful...
Nov. 27, 2015 10:00 AM EST Reads: 306
In his keynote at @ThingsExpo, Chris Matthieu, Director of IoT Engineering at Citrix and co-founder and CTO of Octoblu, focused on building an IoT platform and company. He provided a behind-the-scenes look at Octoblu’s platform, business, and pivots along the way (including the Citrix acquisition of Octoblu).
Nov. 27, 2015 10:00 AM EST Reads: 491
The buzz continues for cloud, data analytics and the Internet of Things (IoT) and their collective impact across all industries. But a new conversation is emerging - how do companies use industry disruption and technology enablers to lead in markets undergoing change, uncertainty and ambiguity? Organizations of all sizes need to evolve and transform, often under massive pressure, as industry lines blur and merge and traditional business models are assaulted and turned upside down. In this new da...
Nov. 27, 2015 09:45 AM EST Reads: 220
In his General Session at 17th Cloud Expo, Bruce Swann, Senior Product Marketing Manager for Adobe Campaign, explored the key ingredients of cross-channel marketing in a digital world. Learn how the Adobe Marketing Cloud can help marketers embrace opportunities for personalized, relevant and real-time customer engagement across offline (direct mail, point of sale, call center) and digital (email, website, SMS, mobile apps, social networks, connected objects).
Nov. 27, 2015 09:15 AM EST Reads: 291