When using docker_clone_volume.sh, I found that when copying a volume with influxdb data,
the clones image was bigger than the original.
cause: alpine base image contains a cp version (busybox) which does _not_ preserve
hardlinks, even with the -a option.
This is fixed by using an ubuntu base image instead of alpine.
downside: ubuntu image is larger than alpine.
Source volume:
influxdb_data 380.2 MB
Before:
influxdb_data.bak 443.5 MB
After:
influxdb_data.ubuntu.bak 380.2 MB
