etcd example with Butane configs

[Aaron D Borden]

Hey folks,

I'm new to Flatcar, Matchbox, Container Linux Config, and Butane. Getting a bit tripped up and finally figured out my CLC in Matchbox is being transpiled as Butane which silently drops the `etcd` property. Is there an example of how to configure etcd with Butane?

[Kai Lüke]

Hi,

we tried to move away from etcd as first example, I would recommend
the nginx example from the quickstart guide:
https://www.flatcar.org/docs/latest/installing/
Currently the docs are in a half-migrated/inconsistent state…

To your question, in Butane you would directly do what the transpiled
Ignition config does when etcd is specified in the CLC config.
Enable etcd-member.service and define a service unit drop-in with a
name like 20-clct-etcd-member.conf that contains your customizations.
Here a drop-in that sets the version of the container image and the
etcd arguments:
[Service]
Environment="ETCD_IMAGE_TAG=v3.0.15"
ExecStart=
ExecStart=/usr/lib/coreos/etcd-wrapper --name="myhost"
--listen-peer-urls="http://1.2.3.4:2380"
--listen-client-urls="http://0.0.0.0:2379"
--initial-advertise-peer-urls="http://1.2.3.4:2380"
--initial-cluster="myhost=http://1.2.3.4:2380"
--advertise-client-urls="http://1.2.3.4:2379"
These options are coming from the example in
https://www.flatcar.org/docs/latest/provisioning/cl-config/examples/#etcd
after replacing the variables with concrete values and pasting it in
docker run --rm -i ghcr.io/flatcar/ct:latest
More details about the CLC transpilation can be found in
https://www.flatcar.org/docs/latest/provisioning/cl-config/#config-transpiler
(It supports variables but with Butane you would directly do what the
generated Ignition does)

Regards,
Kai

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[Mathieu Tortuyaux]

Hi Aaron,

Butane does not have any helper like `etcd`, `locksmith` or `flannel` to generate the Ignition configuration. You have to define them by yourself. The idea is to enable the `etcd-member.service` and to add a systemd drop-in configuration to provide the etcd options (like IP) provided by a metadata service.

Container Linux Config transpiler was generating automagically these configs based on the platform.

Here's an example with Butane: https://www.flatcar.org/docs/latest/installing/cloud/vmware/#templating-with-container-linux-configs-and-setting-up-metadata

Don't hesitate to join the Matrix channel (#flatcar:matrix.org) if you need more direct interaction.

Regards,

Mathieu Tortuyaux (@tormath1)

On Tue, 3 Jan 2023 at 09:51, 'Aaron D Borden' via Flatcar Container Linux User <flatcar-l...@googlegroups.com> wrote:

Hey folks,

I'm new to Flatcar, Matchbox, Container Linux Config, and Butane. Getting a bit tripped up and finally figured out my CLC in Matchbox is being transpiled as Butane which silently drops the `etcd` property. Is there an example of how to configure etcd with Butane?

--

[Aaron D Borden]

Thanks all, I appreciate the examples. I was able to get etcd working.

--
Aaron D Borden
Human and hacker