Installer: Installer creates instances without SSH key-pair

Created on 11 Dec 2018 · 12Comments · Source: openshift/installer

Version

$ ./openshift-install version
./openshift-install v0.6.0
Terraform v0.11.10

Platform:

AWS

What happened?

If the installer doesn't find local SSH Keys available, it does not warn the user and crate instances without any key.

What you expected to happen?

The installer should warn the user about that, and create a new key to be used on the instances.

How to reproduce it?

Make sure you don't have any key on ~/.ssh/
Run the openshift-installer create cluster
Check the keypair used by instances with aws ec2 describe-instances | grep -i key

Source

davivcgarcia

👍1

All 12 comments

Instance<->key associations are an AWS-ism, and the cluster lays down your configured key using Ignition (which is generic) instead. And soon the installed key will be configurable post-install via the machine-config operator, see openshift/machine-config-operator#115.

Did you actually have trouble SSHing in with the key you configured at install-time, or were you just surprised by not seeing the implementation you were expecting?

wking on 11 Dec 2018

I didn't face problems, but I was expecting a warning if no SSH key were found for the user. In my test, the installer deploys the nodes without any keys (without admin access), which is immutable on AWS without the operator you mentioned.

davivcgarcia on 11 Dec 2018

... the installer deploys the nodes without any keys...

No, you can SSH into bootstrap and masters as core with the key you give the installer (and into workers via a SSH hop). It's just not an AWS keypair.

wking on 11 Dec 2018

👍1

... the installer deploys the nodes without any keys...

No, you _can_ SSH into bootstrap and masters as core with the key you give the installer (and into workers via a SSH hop). It's just not an AWS keypair.

What happens if there isn't SSH keys for the user running openshift-installer? What I'm trying to explain is that the installer doesn't ask for a key during openshift-installer create cluster if there isn't a key available for the user, creating instances without authorized SSH keys with no warnings.

davivcgarcia on 11 Dec 2018

@davivcgarcia SSH access isn't required in OpenShift 4, so we don't ask for keys if we don't see any locally. If you want to add keys after the fact, this is possible with the Machine Config Operator, but we don't have docs yet for that (it is in progress though).

crawford on 11 Dec 2018

👍1

Until https://github.com/openshift/machine-config-operator/pull/115 merges I don't believe the installer should proceed without a key. It leaves us with un-debuggable clusters.

eparis on 13 Dec 2018

👍1

I'm also not sure how to do disaster recovery if the nodes have no ssh keys, even if I do have management of ssh keys via the MCO...

eparis on 13 Dec 2018

👍1

Until openshift/machine-config-operator#115 merges I don't believe the installer should proceed without a key. It leaves us with un-debuggable clusters.

That the users have chosen by not supplying a key. And while SSH-debugging is frequent at this stage of development, hopefully it becomes rare as things settle down over the next few months.

I'm also not sure how to do disaster recovery if the nodes have no ssh keys, even if I do have management of ssh keys via the MCO...

We currently set SSH keys in the pointer Ignition config. It looks like openshift/machine-config-operator#115 is about the machine-config daemon laying down keys (which is useful for updating keys without rebooting machines), but we could also teach the machine-config server to add the current key to Ignition configs. That would still get the installer out of key distribution (except for the bootstrap node), but machines would still get keys laid down by Ignition for debugging failures that happen before the machine is alive enough for a machine-confix daemon.

wking on 13 Dec 2018

I'm going to close this issue. I don't think SSH should be required and there is already work in-flight to allow the bootstrap logs to be streamed back without SSH.

/close

crawford on 5 Jan 2019

@crawford: Closing this issue.

In response to this:

I'm going to close this issue. I don't think SSH should be required and there is already work in-flight to allow the bootstrap logs to be streamed back without SSH.

/close

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openshift-ci-robot on 5 Jan 2019

986 also landed recently explicitly saying that we aren't using AWS key pairs, which should help mitigate that particular expectation.

wking on 5 Jan 2019

Are there any use cases where user will not want ssh access? There will always be situations where ssh would be extremely useful. If somebody is so sure ssh is not needed, they can provide a public key where private key has been disposed. Or have a special option.
I think far more often there will be a situation where lack of ssh is frustrating, than a situation where ssh is desired to be completely disabled.