Start Node-RED on OS X login

Node-RED flow for controlling a Blink(1) USB indicator light

Node-RED flow for controlling a Blink(1) USB indicator light

Node-RED is a truly awesome framework for visually building data flows. There is a lot of focus on wiring together hardware devices and Internet of Things, but there are also plenty of modules for connecting to email, social media, various online services etc.

After using it during some months I can confirm that stability is absolutely fine, don’t think I have had a single issue with the setup due to Node-RED itself.

Version 0.10.1 came out a week or so ago (early Feb 2015) and brought things like better partitioning of flows in the form of subflows, improved Raspberry Pi support, binary MQTT payloads to name just a few of the improvements.

I am running Node-RED on an always-on Mac, running latest OS X. This machine is very stable but for various reasons I do need to restart it every now and then. It would then be very nice to have Node-RED start automatically at boot. That’s somewhat complex to do, but having an app starting at login is trivial – let’s do that instead. I am always logged into this computer anyway, so it won’t be a problem.

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Crowdsourcing working RAM module combinations for Synology NAS products

Let’s try an experiment.

I have set up a questionnaire that anyone can fill in and submit.

There you can add working and non-working memory configurations for your Synology NAS. Ideally this will enable people to increase the memory in their NAS:es without lots of trial and error on what memory works in what NAS models – or spammers will fill the document with crap data… Time will tell.

Background is that I started a similar effort here on the blog, but Google Forms are way better for this, so let’s use that instead.

Let’s go – don’t be shy! :)

 

More memory for Synology DS1515+

Update: Let’s work together and capture data on what memory modules work, and which don’t, on the DS1515+ and other Synology NAS models!

 

As noted in a previous post, a new Synology DS1515+ NAS landed here the other week. It’s a very nice products in most respects, but a couple of rather annoying details bring the overall impression down – more on that in a later post.

The DS1515+ ships with 2 GB of RAM, with an extra, empty memory slot available for memory upgrades. 2 GB is really on the low side if you intend to run additional applications on the NAS. CrashPlan for example is built on Java, which is pretty resource hungry to begin with, then the memory consumption goes up with the number of files backed up.

Synology specs tells us that a 4 GB SO-DIMM can be added, for a total of 6 GB. Stories from the Synology forum however indicate that it is quite possible to replace both the internal (some disassembly required, probably voiding warranty..) and user accessible RAM modules, for a total of 16 GB RAM.

With a bunch of different SO-DIMM modules in the drawers here, let’s test them to see which ones can be used with the DS1515+ and which ones cannot.

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Qlik Sense keyboard shortcuts

Qlik Sense is very nice in most ways, the development environment however still falls short when compared to the one found in QlikView. Having a proper Windows client (which QlikView has) just gives more flexibility than using a web based editor and development environment.

Don’t get me wrong – Sense gets the job done – just that for people whose muscle memory is tuned to the QlikView development environment, Sense feels somewhat limiting and slow. That said, after spending a fair bit of time both porting existing QlikView apps to Sense, as well as developing new Sense apps from scratch, the development environment becomes less and less of an issue. I’d say that Qlik still has way to go though. But hey – we are looking at version 1 – I am sure there are plenty of good things to come in future versions.

Anyway – if you spend significant parts of your days in an application, you want to be as effective as possible in your work. QlikView has quite a few powerful keyboard shortcuts, Qlik Sense has somewhat fewer, but still useful. These are listed in this online Qlik Sense help page.

Seems that the help page is not complete though – some shortcuts are not listed there.
Let’s compile a list of them here, please feel free to add additional ones in the comments!

ShortcutAction
Ctrl-KComment (using //) the lines currently selected in the code editor.

 

Windows update breaks QlikView server 11.20 SR10

Update: Turns out it is the “Update for Windows Server 2012 (KB3013767)” that when installed on the server in question prevents the QlikView Directory Service to start. Installing the other two updates mentioned below (KB3004365 and KB3029449) does not affect QV operation.

 

While doing regular maintenance of a QlikView server (running 11.20 SR8) recently (as part of my daytime job), the latest Windows service packs were installed, as usual. This is normally just routine procedure, but not this time.

QlikView Directory Service fails to start

QlikView Directory Service fails to start

After installation was done and the server restarted, it was impossible to log into the QlikView Access Point (i.e. the system’s web UI). The reason was that QlikView’s Directory Service, QDS, failed to start. Even manual attempts at starting it gave the error shown to the right. The error dialog mentions dependencies that fail to start, but this particular service does not have any dependencies listed in its properties dialog. Strange…

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Upgrading firmware on HP ProCurve 1800-24G / J9028B

A recent inventory of network switches showed that the one that is in most active use was on an outdated firmware revision.

I really like the switch in question, an HP ProCurve 1800-24G, as it is fanless and thus completely silent. It’s been in 24/7 use for 5-6 years now, and hasn’t failed once. It also supports things like SNMP, trunking and LACP  (which comes in handy when optimising the network for fast NAS transfers. More on that later..), and configurable LLDP and VLANs. All in all, more than enough for a small network like the one around here.
Oh – the password is not changed or reset by the upgrade – log in as previously.