I’ve freshly built DietPi on a RPi B+ and RPi 3B+ and the docker-compose command (without arguments) executes on the 3B+ but on the B+ I get Illegal instruction.

any pointers ?

How did you installed Docker-Compose? Did you used dietpi-software?

yup for both RPi’s I used dietpi-software

ok can you try following

curl -fL '' -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
docker-compose version

that worked thanks alot

Looks like docker-compose v1 is not able to run on old ARMv6 boards anymore. Good to know. Therefore we already agreed internally to switch to v2 on DietPi release V8.1

perfect thanks