Butler Cache Warmer + Docker = True

More Docker in the Butler family!

Today version 2.0 of Butler CW was released, including a Docker image and configuration files needed to run Butler CW as a Docker container.

Feature wise the stand-alone Node.js app and the new container-based solution are identical, it’s just way more convenient to run it as a Docker container.

Additional info is available in the GitHub repository.

Yesterday the original Butler tool was Dockerized, today Butler CW… Do you see the trend?

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Hey Butler, please meet Docker

Before the summer the Butler tool turned two years old – time flies!

Over those years I have installed, tweaked and upgraded a fair number of Butler instances… Not a problem per se, but maintaining a production grade Butler instance does assume a certain level of experience around Node.js, Linux, networking etc.

The most recent Butler version (v2.2) attempts to make it easier to deploy and operate Butler.  This is achieved by deploying Butler as a Docker container instead of a regular Node.js app.

The Docker image (from which a container is created) contains exactly the same Node.js app that you can run right on your server or laptop – i.e. there is no functional difference what so ever between running the Node app natively, and running it as a Docker container.

There are some significant benefits of running Butler under Docker:

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SOLVED: Not possible to install new nodes in Qlik Sense June 2018 environment

I worked out the issue preventing me to add additional nodes to a Qlik Sense Enterprise suystem whose central node had been updated to June 2018.

The June 2018 version of Qlik Sense Enterprise relies on a database called “SenseServices” to be available in the Postgres db (as in earlier versions, Postgres can run on the central node or on some other server).

When running the June 2018 installer on a new server (which is to be added as a new node in a Sense Enterprise cluster), the installer verifies that the SenseServices database exists. If it does not, you get an error half-way through the installer:

SenseServices db is missing

 

Maybe there is info somewhere that you need to create a new “SenseServices” db in Postgress before installing additional Sense nodes… but I looked (a lot) without finding anything.

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Butler SOS v2.0 – Real-time error and warning dashboards for Qlik Sense

This one is long overdue, but finally here: Butler SOS v2.0

The new version is an almost complete re-write of v1.0. Changes are plentiful and include

  • All warnings and errors stored by Sense in its log database are now pulled into Butler SOS, from where it can be graphed and acted upon.
    This is a big deal, as it was previously not possible to get notifications or alerts when errors or warnings started to pile up in the logs.
  • Operational health metrics are still pulled from Qlik Sense, but this is now done directly from the QIX engine rather than via a hard-to-secure virtual proxy.
  • Using certificates for authentication with Sense removes potential security issues with v1.0.
  • Config file is now YAML instead of JSON. More human readable and with inline comments.
  • Config file now allows for more fine-grained control of Butler SOS.
  • Several bugs fixed, especially around sending metrics to MQTT.

The readme file on GitHub has all the details, here are some screen shots to get you started though:

 

The new version is available on GitHub.

 

PS. This is blog post # 100. Yaaay!!!

Ptarmigan Labs is open for business!

Wow – after 10 years and one day at Spotify the time has come to take the next step.

Going forward I will work in my own company, Ptarmigan Labs AB.
The company’s focus will be more or less the same as what I have spent the past 6-7 years doing at Spotify, i.e. helping people, teams and organisations understanding, enriching and making use of their data.

Qlik Sense will remain my main focus, the Qlikosphere is really heating up with lots of interesting new features both launched and around the corner.
During the past 12 months Qlik Sense has really taken great steps towards becoming a proper enterprise grade BI platform.
Given this development I am really looking forward to Qonnections 2018 and the announcements that are likely to happen there. Interesting times!

You can reach me via info <at> ptarmiganlabs.com, or on LinkedIn.
My open source projects are found on GitHub, as always.

Onward!

How to set up free SSL certificates for Qlik Sense

I recently had a need for an isolated Qlik Sense environment, in order to test some of the new features of Qlik Sense September 2017.

While it works perfectly fine to run Sense with self-signed certificates, you then get browser warnings that the certificates are not valid etc. That might be fine, but as the test at hand involved testing my app duplicator service for Qlik Sense (which require a proper SSL cert) together with the September 2017 version of Sense, I needed a proper SSL certificate.

As I have good experiences using the free certificates of Let’s Encrypt (they secure this blog, for example) I thought it would be a good exercise figuring out how to use them together with Qlik Sense Enterprise.

The notes below are largely reminders-to-self, in case I need to do this again some day. Maybe they can also be useful for others out there.

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