[Solved] You run this command to back up a volume but get an error:docker run --rm -v myvol:/data busybox tar cvf /data/myvol.tar /dataWhat is the likely cause? | Docker

Docker - Production Patterns

You run this command to back up a volume but get an error:

docker run --rm -v myvol:/data busybox tar cvf /data/myvol.tar /data

What is the likely cause?

AIncorrect tar syntax for creating archive

BTrying to write the tar file inside the same volume being archived

CMissing --backup flag in docker run

DVolume myvol does not exist

Step-by-Step Solution

Solution:

Step 1: Identify tar target path
The command tries to create the tar file inside the same volume directory being archived.
Step 2: Understand tar behavior
Writing the archive inside the source directory causes tar to include the archive itself recursively, leading to errors.
Final Answer:
Trying to write the tar file inside the same volume being archived -> Option B
Quick Check:
Archive inside source causes recursive error [OK]

Quick Trick: Never save backup archive inside the source volume [OK]

Common Mistakes:

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