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OpenShift registry behind registry auth issues


I spend most of the day debugging why my OpenShift registry wasn’t working because the cluster lives behind a http proxy. I can see OpenShift ansible configured the registry with proxy settings including no_proxy, but in the error logs I could see during authentication it was trying to talk to the master api server at, but that wasn’t in the no_proxy env setting so the proxy was trying to resolve it and failing. 

So that can be fixed by adding to no_proxy, but it felt a bit hacky. A dns name would be better as they’re easier to wildcard in no_proxy. 

I want to know how the registry knows to use the IP address of the master api server instead of a dns name? I couldn’t see a reference to the api server in /etc/registry. Where does it get that from? Is it part of a docket secret?



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