What this snippet does
Mounting both the volume and a host directory into a throwaway container makes backups simple.
Expected output
-rw-r--r-- 1 root root 48M pgdata.tar.gz
Why practise typing this
Typing volumes & storage code builds muscle memory for the symbols and indentation Docker uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Docker practice
- Persisting database dataVolumes & Storage · beginner
- Live-reloading sourceVolumes & Storage · beginner
- Mount hides image contentsVolumes & Storage · intermediate
- Protecting node_modulesVolumes & Storage · intermediate
- VOLUME freezes later writesVolumes & Storage · intermediate
- In-memory scratch spaceVolumes & Storage · advanced