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https://github.com/apricote/flatcar-packer-hcloud.git
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53 lines
2.2 KiB
Markdown
53 lines
2.2 KiB
Markdown
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# Build Flatcar Snapshots on Hetzner Cloud with Packer
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## Requirements
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- Hetzner Cloud API Token
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- Packer
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- Butane
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- Hetzner Cloud CLI (`hcloud`)
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This only works on Flatcar > `3913.0.0`, as this version has the appropriate versions of `ignition` and `afterburn` that
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add support for the Hetzner Cloud metadata service.
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## Building Snapshots
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```shell
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$ git clone ... # TODO
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$ export HCLOUD_TOKEN=...
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$ packer init flatcar.pkr.hcl
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$ butane butane-oem.yaml --pretty --strict --output=ignition-oem.json
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# This will build Snapshots for x86 and arm. If you only need one, you can add
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# `--only=hcloud.x86` or `--only=hcloud.arm` to the `packer build` command.
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$ packer build flatcar.pkr.hcl
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# ... Takes a few minutes
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==> Builds finished. The artifacts of successful builds are:
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--> hcloud.x86: A snapshot was created: 'flatcar-alpha-x86' (ID: 157132241)
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--> hcloud.arm: A snapshot was created: 'flatcar-alpha-arm' (ID: 157132252)
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$ hcloud image list --type=snapshot --selector=os=flatcar
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ID TYPE NAME DESCRIPTION ARCHITECTURE IMAGE SIZE DISK SIZE CREATED DEPRECATED
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157132241 snapshot - flatcar-alpha-x86 x86 0.47 GB 20 GB Sat Mar 30 16:48:22 CET 2024 -
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157132252 snapshot - flatcar-alpha-arm arm 0.42 GB 40 GB Sat Mar 30 16:48:24 CET 2024 -
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```
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## Create a Sever
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You can now create a new server from the snapshot. Not every feature might automatically work, as the snapshot is
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missing the functionality from [`hc-utils`](https://github.com/hetznercloud/hc-utils). Configuring SSH Keys and User
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Data (Ignition) will work as expected.
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```shell
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# Get ID of the most recent flatcar snapshot for x86
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$ SNAPSHOT_ID=$(hcloud image list --type=snapshot --selector=os=flatcar --architecture=x86 -o=columns=id -o noheader --sort=created:desc | head)
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# Create a new server
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# If you have, you can specify an Ignition config with `--user-data-from-file ignition-user.json`
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$ hcloud server create --name flatcar-test --image $SNAPSHOT_ID --type cx11 --ssh-key <your-key>
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# Takes a minute or two
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# Now you can login, the following is a helper that calls `ssh` with the public ipv4 address of the server
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$ hcloud server ssh flatcar-test
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```
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