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https://github.com/apricote/hcloud-upload-image.git
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Julian Tölle
fdfb284533
The base image used requires ~0.42Gi. Even if the uploaded image is smaller, those bytes are currently not overwritten and still part of the stored snapshot. By zeroing the root disk first, those unwanted bytes are removed and not stored with the snapshot. This has two benefits: 1. Snapshots are billed by their compressed (shown) size, so small images are now a bit cheaper. 2. The time it takes to create a server from the snapshot scales with the snapshot size, so smaller snapshots means the server can start more quickly. This reduces the size of an example Talos x86 image from 0.42Gi before, to 0.2Gi afterwards. An example Flatcar image was 0.47Gi before, and still has that size with this patch. There are two ways to zero out the disk: - `dd if=/dev/zero of=/dev/sda` actually writes zeroes to every block on the device. This takes around a minute to do. - `blkdiscard /dev/sda` talks to the disk direclty and instructs it to discard all blocks. This only takes around 5 seconds. As both have the same effect on image size, but `blkdiscard` is SO MUCH faster, I have decided to use it. Even though only small images benefit from this, this is now enabled by default as the downside (5 second slower upload) does not justify additional flags or options to enable/disable this. Closes #96 |
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