Discuss Docker DCA Exam Topic 6 Question 77

Will this command mount the host's '/data* directory to the ubuntu container in read-only mode?

Solution. 'docker run -add-volume /data /mydata -read-only ubuntu'

AYes

BNo

Suggested Answer: B

This command does not mount the host's /data directory to the ubuntu container in read-only mode. The --add-volume and --read-only flags do not exist and will cause an error. To mount a host directory or a named volume to a container, you need to use the -v or --volume flag. To mount the host's /data directory to the ubuntu container in read-only mode, you need to use -v /data:/mydata:ro instead. Reference: https://docs.docker.com/storage/bind-mounts/, https://docs.docker.com/engine/reference/run/#volume-shared-filesystems

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15 comments · newest first

Claudio 10 months ago

Wait, is it really that simple? I thought it was more complicated!

Karima 11 months ago

No way, that's not how you do read-only.

Richelle 11 months ago

I thought it was correct at first, but now I'm not so sure.

Willodean 11 months ago

Definitely not! It should be `-v` for volume.

Johana 11 months ago

That command has the wrong flags.

Carissa 12 months ago

I want to say yes, but I have a nagging feeling that the command has some syntax issues. I should have reviewed that section more thoroughly.

Quiana 12 months ago

I recall a similar practice question where the volume was mounted correctly, but I think the path needs to be absolute. This one looks off to me.

Franchesca 12 months ago

I'm not entirely sure, but I feel like the `-read-only` flag might not be right either. I practiced a question where it was just `--read-only`.

Hannah 1 year ago

I think the command is incorrect because I remember the syntax for mounting volumes is usually `-v` instead of `-add-volume`.

Macy 1 year ago

Wait, is the '-add-volume' flag even a real thing? I don't remember seeing that in the Docker docs. I'm a bit confused by the wording of this question. I'll need to review my notes on volume mounting to figure this out.

Thomasena 1 year ago

Okay, let me think this through. The key part seems to be the '-read-only' flag, which should mount the '/data' directory in read-only mode. I'm pretty confident this will work, but I'll verify the rest of the command just to be sure.

Kris 1 year ago

Hmm, I'm not entirely sure about this one. The command looks a bit tricky with the '-add-volume' flag. I'll need to double-check the Docker documentation to make sure I understand the syntax correctly.

Paulina 1 year ago

Alright, I've got this. The correct command is 'docker run -v /data:/mydata:ro ubuntu'. The '-v' flag is used to mount volumes, and the ':ro' at the end specifies read-only mode. I'm feeling good about this one.

Sabina 1 year ago

The default behavior is to serialize the full hierarchy, so I'm guessing the answer is "Nothing, this is the default".

Evangelina 1 year ago

Hmm, I'm not entirely sure how to tackle this. I'll need to review the inventory valuation methods and make sure I understand the difference between FIFO and weighted-average before I can confidently answer this.

Docker DCA Exam - Topic 6 Question 77 Discussion