docker entrypoint running bash script gets "permission denied"

Solution 1:

1. "Permission denied" prevents your script from being invoked at all. Thus, the only syntax that could be possibly pertinent is that of the first line (the "shebang"), which should look like #!/usr/bin/env bash, or #!/bin/bash, or similar depending on your target's filesystem layout.

2. Most likely the filesystem permissions not being set to allow execute. It's also possible that the shebang references something that isn't executable, but this is far less likely.

3. Mooted by the ease of repairing the prior issues.

The simple reading of

docker: Error response from daemon: oci runtime error: exec: "/usr/src/app/docker-entrypoint.sh": permission denied.

...is that the script isn't marked executable.

RUN ["chmod", "+x", "/usr/src/app/docker-entrypoint.sh"]

will address this within the container. Alternately, you can ensure that the local copy referenced by the Dockerfile is executable, and then use COPY (which is explicitly documented to retain metadata).

Solution 2:

An executable file needs to have permissions for execute set before you can execute it.

In your machine where you are building the docker image (not inside the docker image itself) try running:

ls -la path/to/directory

The first column of the output for your executable (in this case docker-entrypoint.sh) should have the executable bits set something like:

-rwxrwxr-x

If not then try:

chmod +x docker-entrypoint.sh

and then build your docker image again.

Docker uses it's own file system but it copies everything over (including permissions bits) from the source directories.

Solution 3:

I faced same issue & it resolved by

ENTRYPOINT ["sh", "/docker-entrypoint.sh"]

For the Dockerfile in the original question it should be like:

ENTRYPOINT ["sh", "/usr/src/app/docker-entrypoint.sh"]