Nginx logs two upstream statuses for one upstream

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Category: Linux

Published: Friday, 12 June 2020 15:54

Written by Ben Tasker

I'm a big fan (and user) of NGinx. 

Just occasionally, though, you'll find something that looks a little odd - despite having quite a simple underlying explanation.

This one falls firmly into that category.

When running NGinx using ngx_http_proxy_module (i.e. using proxy_pass), you may sometimes see two upstream status codes recorded (specifically in the variable upstream_status) despite only having a single upstream configured.

So assuming a logformat of

'$remote_addr\t-\t$remote_user\t[$time_local]\t"$request"\t'
'$status\t$body_bytes_sent\t"$http_referer"\t'
'"$http_user_agent"\t"$http_x_forwarded_for"\t"$http_host"\t$up_host\t$upstream_status';

You may, for example, see a logline line this

1.2.3.4	-	-	[11/Jun/2020:17:26:01 +0000]	"GET /foo/bar/test/ HTTP/2.0"	200	60345109	"-"	"curl/7.68.0"	"-"	"testserver.invalid"	storage.googleapis.com	502, 200

Note the two comma-seperated status codes at the end of the line, we observed two different upstream statuses (though we only passed the 200 downstream).

This documentation helps explain why this happens.

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Finding Vauxhall Paint Codes

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Category: Vehicles

Published: Saturday, 25 July 2020 08:16

Written by Ben Tasker

Cars come in a weird and wonderful array of colours, which is great until you need to find out which exact shade of touch-up/repair paint you need to order after an issue.

Most manufacturers give shades both a name and a code - "Black Sapphire" (20R) , "Flame Red" (79L) - but, there may be multiple codes/shades within a name.

This documentation details how to find the paint code for a Vauxhall car. In this case, it's a Corsa but the information is available on all models, it's only the location which may change.

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Building a Raspberry Pi Based Music Kiosk

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Category: Linux

Published: Tuesday, 04 February 2020 16:57

Written by Ben Tasker

I used to use Google's Play Music to host and play our music collection.

However, years ago, I got annoyed with Google's lacklustre approach to shared collections, and odd approach to VMs. So, our collection migrated into a self-hosted copy of Subsonic.

Other than a few minor frustrations, I've never looked back.

I buy my music through whatever music service I want, download it onto the NFS share and Subsonic picks up on it following the next library scan - we can then stream it to our phones (using DSub), to the TV (via a Kodi plugin) or to a desktop (generally, using Jamstash). In the kitchen, I tend to use a bluetooth speaker with the tablet that I use to look up recipes.

However, we're planning on repurposing a room into a puzzle and playroom, so I wanted to put some dedicated music playback in there.

Sonos devices have Subsonic support, but (IMO) that's a lot of money for something that's not great quality, and potentially has an arbitrarily shortened lifetime.

So, I decided to build something myself using a Raspberry Pi, a touchscreen and Chromium in kiosk mode. To keep things simple, I've used the audio out jack on the Pi, but if over time I find the quality isn't what I hope, it should just be a case of connecting a USB soundcard in to resolve it.

There's no reason you shouldn't be able to follow almost exactly the same steps if you're using Ampache or even Google Play Music as your music source.

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