DO188 Chapter 4 lab error

[Nick6]

Hi,

After building the image near the end of Chapter 4 "Lab: Custom Container Images" of course DO188 and then running the container, the following error results.

I have tried building the image from the solution and I get the same error.

Is there something I'm missing or is it a bug?

Thanks for your help.

[Tess]

The error messages show a clear explanation of what's going wrong: the files for the NodeJS application are owned by "root" as opposed by the user that's running the app. 

Make sure to match up the "USER" directive with the file ownerships of the application files. 

[tnishiok · Accepted solution]

I recently completed the DO188 course and I can confirm that application could run. Why not looking into the container by replacing the entrypoint with bash so that you can check files under the "/opt/app-root/src/.npm/_cacache/tmp/" directory which looks suspicious as @Tess suggested?

[student@workstation custom-lab]$ podman run --name=custom-lab -it --entrypoint bash -p 8080:8080 -p 8443:8443 podman-qr-app

bash-4.4$ ls -la /opt/app-root/src/.npm/_cacache/tmp/

total 0

drwxr-xr-x. 2 default root 6 Jun 4 20:16 .

drwxr-xr-x. 5 default root 51 Jun 4 20:16 ..

bash-4.4$ whoami

student

bash-4.4$ npm start

> custom-images-lab@1.0.0 start

> node index.js

TLS Server running on port 8443

Server running on port 8080

It's empty in my container and the app can start w/o error. BTW DO188 has two versions v4.10 and v4.12 but I followed the instructions of v4.12.

[Tess]

> "Why not looking into the container by replacing the entrypoint with bash so
> that you can check files"

This is of course the best advice possible!

Learn how to troubleshoot, instead of only following the instructions the training gives to you. Excellent suggestion @tnishiok .

[Nick6 · Accepted solution]

Thank you for your ideas on a solution. I have found it to work but I think the more correct solution is to follow the intructions in the error by applying this line in the Containerfile - 

sudo chown -R 998:995 "/opt/app-root/src/.npm"

Obviously one would adapt this in the Containerfile by adding the RUN, dropping the sudo and replacing the student user/group.

This worked for me.

Thanks again.

[Nick6]

Thanks for the suggestions so far. I will try them in due course.

It is version 4.12.

It still makes me wonder why the solution doesn't work though.