Developing on Staxmanade

Strange error on docker-compose up: oci runtime error: exec format error

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I ran into a non-intuitive error while mucking around with docker-compose recently on an example.

docker-compose up

Building some_server
Step 1 : FROM alpine
 ---> 13e1761bf172
Step 2 : ENV DEMO_VAR WAT
 ---> Using cache
 ---> 378dbaa4a048
Step 3 : COPY docker-entrypoint.sh /
 ---> e5962cef9382
Removing intermediate container 43fa24c31444
Step 4 : ENTRYPOINT /docker-entrypoint.sh
 ---> Running in 5a2e19bf7a45
 ---> 331d2648d969
Removing intermediate container 5a2e19bf7a45
Successfully built 331d2648d969
Recreating exampleworkingdockercomposeenvironmentvars_some_server_1

The Error

ERROR: for some_server  rpc error: code = 2 desc = "oci runtime error: exec format error"
Traceback (most recent call last):
  File "<string>", line 3, in <module>
  File "compose/cli/main.py", line 63, in main
AttributeError: 'ProjectError' object has no attribute 'msg'
docker-compose returned -1

The Actual Problem and Solution:

I had a Dockerfile that used an entrypoint that looked like ENTRYPOINT ["/docker-entrypoint.sh"].

The real problem was the docker-entrypoint.sh script was missing a #shebang.

So changing this

echo "ENV Var Passed in: $DEMO_VAR"

to this

#!/bin/sh
echo "ENV Var Passed in: $DEMO_VAR"

solved my issue!

Also note it'll depend on the base image FROM <some linux distro> that may chagne what you're required #shebang should be.

Whew!

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