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When creating/updating a server, or creating/updating a Floating IP, it is possible to set a reverse PTR record.

See reverse_ptr on https://www.cloudscale.ch/en/api/v1.

We need to add two tests that verify that the reverse PTR can be set and that querying it using standard DNS tools works:

• One test for servers
• One test for Floating IPs

There should be a maximum amount of time that this takes and we need to ensure that creating bogus records does not work and returns a useful error message.

Self-updating images like Flatcar or Fedora CoreOS pose a challenge for our tests. After they are booted for the first time, they upgrade themselves, possibly leading to a reboot or a restart of the SSH daemon.

So far, this has been solved by using a fault tolerant SSH mechanism, which automatically reconnects dropped SSH connections. This could mask real issues and not as surgical a fix as we would like.

Instead, we should wait for such images to update themselves, before using them for our tests. This adds some image-specific knowledge to our tests. There is some precedent for this however, as we already wait for cloud-init to finish.

During this phase the fault-tolerance is probably still necessary, but it should be limited afterwards, as we do not expect sudden SSH connection drops, after the server has been declared ready.