If you need easy distributed key management, modern SSH makes this fairly straightforward with some config values. It supports executing a program to get the SSH key at login time, dynamically. This way you can still maintain local certificates for fallback, and you can plug into anything. For example in the past I wrote a simple golang based app that loaded all of the SSH pubkeys from my organizations github, for users in a specific team.
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If you need easy distributed key management, modern SSH makes this fairly straightforward with some config values. It supports executing a program to get the SSH key at login time, dynamically. This way you can still maintain local certificates for fallback, and you can plug into anything. For example in the past I wrote a simple golang based app that loaded all of the SSH pubkeys from my organizations github, for users in a specific team.