Running a bash script from alpine based docker

Question

I have Dockerfile containing:

FROM alpine

COPY script.sh /script.sh

CMD ["./script.sh"]

and a script.sh (with executable permission):

#!/bin/bash
echo "hello world from script file"

when I run

docker run --name testing fff0e5c81ca0

where fff0e5c81ca0 is the id after building, I get an error

standard_init_linux.go:195: exec user process caused "no such file or directory"

So how can I solve it?

Answer 1

To run a bash script in alpine based image, you need to do either one

1. Install bash

   $ RUN apk add --update bash
   

2. Use #!/bin/sh in script instead of #!/bin/bash

You need to do any one of these two or both

Or, like @Maroun's answer in comment, you can change your CMD to execute your bash script

CMD ["sh", "./script.sh"]