Tag Archives: butler

Monitoring and auto-starting Node.js services on Windows Server

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When relying on various Node.js services (e.g. Butler SOS, Butler, App Duplicator etc), you quickly run into the challenge to ensure all services are always up and running.
A failing service might be fine, as long as it is quickly restarted in a predictable way.

A concrete example could be Qlik Sense or QlikView apps that send status messages to Slack during the execution of their reload scripts. Those messages will fail if Butler is for some reason not running.

This leads us to the conclusion that the services must automatically be

a) started when a server is rebooted, and
b) restarted if they for some reason terminate/die.

Enter process monitors.

At their core, process monitors ensure that the desired processes are always running, i.e. bullet b) above. Some process monitors also offer additional features such as zero-downtime restart of services, memory and performance profiling of the monitored services, being able to monitor different kinds of processes (not only Node.js ditto).

Adding to the pain is the fact that Sense and QlikView runs on Windows servers, meaning that all those great tools available on Linux cannot be used.

Looking at Node.js specifially, I have found two process monitors to work well on Windows: Forever and PM2.

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Qlik Sense app duplicator 2.0 released

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On the surface everything looks the same.

Under the hood everything has changed.

The 2.0 release of the Qlik Sense app duplicator is a major update. Most code has been refactored.

The most notable changes are:

  • Switched to using Enigma.js for talking to the Sense engine, instead of the previously used Qsocks library. Enigma is open source just like Qsocks, but the former is supported and actively developed by Qlik themselves – that is really important.
  • Much improved logging.
  • A nasty bug has been fixed.
    The app duplicator would fail semi-silently when multiple app duplication requests were sent to it simultaneously. No more of that – the duplicator now handles also high-load scenarios gracefully, and have been battle-tested in hands-on sessions when many developers created their own apps from templates at the same time. Nice.The 2.0 version is available on GitHub, as always.

Butler SOS goes main stage at Qonnections 2017

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Edit:

Qlik has made available a video from Anthony Deighton’s (Qlik’s CTO) keynote session.

Very much worth looking through the entire video – it was very interesting indeed. 
His highlight of customer and partner project’s is found 12 min 36 sec into the video.

 

 

A few weeks back something cool happened.

During the big, main stage keynote session at Qlik‘s annual Qonnections conference, my Butler SOS project was highlighted as an example of a great application built on top of the Sense APIs.

I have to admit that it is pretty neat to get that kind of recognition from industry peers… a bit of ego boost :).

And it makes it easier and even more fun to work out coming, similar concepts and services. Lots more to be done around DevOps and Qlik Sense.

Speaking of which:
I started playing around with Qlik’s new Enigma.js library a week or so ago, to see if it could be used in coming projects.

Very nice indeed. Nothing wrong with good old Qsocks, but Enigma is a step in the right direction. Just like qsocks, Enigma is open source – but also fully supported by Qlik. That is a huge advantage!

Let there be (blinky) light!

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I was recently in Helsinki, giving a talk at a QlikDevGroup event. Great event, great crowd. The topic was SenseOps and Butler SOS, and I showcased the lamp above as an example of a funky, but still relevant way to monitor user activity in a Qlik Sense Enterprise environment.

A person in the audience asked how the map works. I claimed it was super simple, costing less than USD 10 to build (assuming you already have a suitable enclosure) and uses just four wires hooked up between some pre-made modules. Time to prove it.

The four wires part might have been a slight exaggeration… but it depends on which wires you count – right?

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Butler SOS: real-time server stats for Qlik Sense

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I got somewhat distracted from the idea of breaking up the existing Butler software into smaller, stand-alone micro services.
Or rather, an idea came to mind. An idea too good not to explore…

The healthcheck API of Qlik Sense provides basic metrics for both the Qlik Sense engine itself, and the server it is running on. Things like CPU load, available RAM, number of connected users and what apps are loaded into the Sense engine.

The idea behind Butler SOS ( SOS = SenseOps Stats) is very simple:
Get the healthcheck metrics for all servers in a Sense cluster. Then send the information to MQTT for immediate, real-time use cases.
It is directly aimed at bringing better features to the monitoring step of SenseOps – please visit SenseOps.rocks for more info on SenseOps.

Butler SOS is nice and sending data via MQTT make the health metrics available in for example Node-RED. Node-RED has some basic graph options, but not anywhere near those offered by Grafana. Grafana is very, very cool… A live demo is available here – do check it out – it is very nice indeed.

Creating real-time dashboards in Grafana is greatly simplified if the data is stored in some kind of time series database. Influxdb is an obvious choice. It is open source, installation is very easy, and there are good Node.js libraries that make it trivial to insert data into a Influxdb database.
Thus – Butler SOS also sends the Sense health metrics to an Influx db of choice.

Only need Influxdb and not MQTT? Or the other way around?
No problem, the Butler SOS config file include options for independently turning on/off sending of data to MQTT and Influxdb.

Butler SOS, including a sample Grafana dashboard, is available on GitHub.

Using Grafana we get dashboards and charts like these:

Showing CPU load, available RAM, active users, cache hit ratio and more.

A 100% cache hit ratio (left y axis) means that no additional calculations were needed to serve the requested data to the client. The yellow dots are associated with the right y axis, which tells us how big the request in question was.

 

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Butler-MQTT and a realtime reload dashboard for Sense

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Teaser video: Realtime reload dashboard

Just to get your interest – this video shows what Butler-MQTT can be used for. All the pieces are included in the Github repo. The concept of a reload dashboard can be very useful if you have long running (hours!) reloads. Instead of relying on Sense’s own reload log window, you can get an easy to understand visual feedback from a reload dashboard.

The video shows

  1. A reloading Sense app (upper left). The app has two nested loops (date and country), with half a second delay in each.
  2. Within each loop a status message is sent to  Butler-MQTT (bottom left), which forwards the message to a MQTT server running on localhost.
  3. A Node-RED dashboard picks up the MQTT messages and render a dashboard showing the progress of the running reload.

The “Sales” line chart deserves some comment too.
In the outer loop in the app’s load script, the script calculates sum(sales) for that particular loop iteration. That value is then sent to a MQTT topic, and then plotted in the dashboard.
This way you can get an immediate, visual feedback on the actual data produced by the reload. Not by any means always needed – but it can also be very, very useful.

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Sense + DevOps = SenseOps

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For some time I have been thinking about how to improve the Sense development process as a whole. There is a lot of gathered experience and best practices from the wider software development community, but how can we apply this to Qlik Sense development?

Some initiatives are starting to appear. Qlik themselves are open sourcing microservices such as the Governed Metrics Service , as well as open sourcing key libraries that make it easier to use Sense as a general purpose analytics platform.  I have a couple of contributions in this space too, with the Butler and App duplicator microservices.

I think more can be done though.
Looking at the concepts promoted in DevOps, it struck me that Sense development follows about the same phases as those in DevOps. Combining Sense and DevOps of course gives us….

 

SenseOps

 

The more I looked at it, the more I felt “wow – SenseOps really rocks!”

Thus, please meet a new site: senseops.rocks

Head over for a look, and feel free to feedback in the discussion forums there.
Enjoy!