Fix docker_clone_volume.sh to preserve hard-links #19
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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
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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 to download than alpine. (~ 80MB vs 7 MB)
Source volume:
influxdb_data 380.2 MBBefore (busybox cp):
influxdb_data.bak 443.5 MBAfter (ubuntu cp):
influxdb_data.ubuntu.bak 380.2 MBNB: this pull request is not about size, but rather about correctness. A clone should be identical. Not preserving hard links, might actually break apps that depend on it. (like the influxdb database mentioned above)