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Simon Willison Profile picture
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11 Jun, 6 tweets, 2 min read
A silly thing that puts me off using Docker Compose a bit: I frequently have other projects running on various 8000+ ports, and I don't like having to shut those down before running "docker-compose up"

Is there a Docker Compose pattern for making the ports runtime-configurable?
I'd love to be able to run something like this:

cd someproject
export WEB_PORT=3003
docker-compose up

And have the project's server run on localist:3003 without any risk of clashing with various other Docker Compose AND non-Docker-Compose projects I might be running
This looks like exactly what I want! The “.env” file You can set default values for any envir
And you can have Docker Compose pick an ephemeral port for you too!
Is there a good collection of Docker Compose dev environment best practices anywhere? Especially for Django apps but really for anything where you run a database and an app server that talks to it

I usually go by random Google searches and pasted examples, anything better?
This has a ton of great Docker Compose tips I hadn't encountered before

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More from @simonw

Simon Willison Profile picture
10 May
Announcing Django SQL Dashboard, now out of alpha and ready for people to try out on their own Django+PostgreSQL projects: simonwillison.net/2021/May/10/dj…
The key idea here is to bring some of the most valuable features of Datasette to any Django+PostgreSQL project

You can execute read-only SQL queries interactively, bookmark and share the results, and write queries that produce bar charts, progress bars and even word clouds too
I recorded a three minute video demo which shows the tool in action
Read 9 tweets
Simon Willison Profile picture
10 May
Out of interest: if you have a blob of JSON on your clipboard and you want to see a pretty-printed version of it, what's your fastest way to do that?
I hit Shift+Command+N in VSCode to get a new window, paste it in there, then hit Shift+Command+P to get the command palette, type JS and select the JSON pretty print option - which I think I installed as an extension at some point
Other times I'll use "pbpaste | jq", occasionally I'll use ipython like so:

s = """<paste JSON here>"""
import json
print(json.dumps(json.loads(s), indent=2))
Read 6 tweets
Simon Willison Profile picture
3 May
What are the options for "serverless" PostgreSQL like these days? My definition of serverless here is that you don't have to spend any money at all if you're not getting any DB traffic, and cost then scales up as the traffic and storage you are using increases
Aurora PostgreSQL is the most obvious option, though it's not clear to me if you have to keep at least one instance running for it or if it fully "scales to zero" for projects that aren't receiving any traffic at all
Consensus in replies seems to be that this doesn't actually exist yet - scale-to-zero for a relational database server like PostgreSQL is evidently a whole lot harder than scale-to-zero for a stateless web application server as seen with things like Google Cloud Run
Read 6 tweets
Simon Willison Profile picture
2 May
"Hosting SQLite databases on Github Pages" is absolutely brilliant: it adds a virtual filesystem to SQLite-compiled-to-WebAssembly in order to fetch pages from the database using HTTP range requests phiresky.github.io/blog/2021/host…
Check out this demo: I run the SQL query "select country_code, long_name from wdi_country order by rowid desc limit 100" and it fetches just 54.2KB of new data (across 49 small HTTP requests) to return 100 results - from a statically hosted database file that's 668.8MB!
Looks like the core magic here is only around 300 lines of (devastatingly clever) code github.com/phiresky/sql.j…
Read 4 tweets
Simon Willison Profile picture
1 May
The feature I most want from Twitter is "view this user's tweets without showing their retweets"
Note that this isn't the same thing as turning off someone's retweets - I want to go to the profile of someone I don't even follow and see what they actually say, not just a stream of stuff they have retweeted
This trick works!
Read 4 tweets
Simon Willison Profile picture
30 Apr
I love that the latest XKCD has inspired spin-off versions in multiple branches of academia
Here's the XKCD
ML / NLP
Read 22 tweets

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