Which command correctly backs up the Docker volume named appdata to a tar archive appdata_backup.tar in the current directory?

easy📝 Syntax Q3 of 15

Docker - Production Patterns

Which command correctly backs up the Docker volume named appdata to a tar archive appdata_backup.tar in the current directory?

Adocker run --rm -v $(pwd):/data -v appdata:/backup busybox tar cvf /data/appdata_backup.tar /backup

Bdocker run --rm -v appdata:/backup -v $(pwd):/data busybox tar cvf /data/appdata_backup.tar /backup

Cdocker run --rm -v appdata:/data busybox tar xvf /data/appdata_backup.tar -C /backup

Ddocker run --rm -v appdata:/data -v $(pwd):/backup busybox tar cvf /backup/appdata_backup.tar -C /data .

Step-by-Step Solution

Solution:

Step 1: Mount the volume to back up
The volume appdata is mounted to /data inside the container.
Step 2: Mount the host directory for backup storage
The current directory $(pwd) is mounted to /backup to store the tar file.
Step 3: Use tar to create the backup
The command tar cvf /backup/appdata_backup.tar -C /data . creates a tar archive of the contents of /data (the volume) and saves it to /backup (host directory).
Final Answer:
docker run --rm -v appdata:/data -v $(pwd):/backup busybox tar cvf /backup/appdata_backup.tar -C /data . -> Option D
Quick Check:
Volume mounted at /data, backup saved to /backup/appdata_backup.tar [OK]

Quick Trick: Mount volume at /data and backup dir at /backup [OK]

Common Mistakes:

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