Bug 1780982

Summary:	Authentication and Authorization options are not exposed for OpenShift API server
Product:	OpenShift Container Platform	Reporter:	Cesar Wong <cewong>
Component:	openshift-apiserver	Assignee:	Cesar Wong <cewong>
Status:	CLOSED ERRATA	QA Contact:	Xingxing Xia <xxia>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	4.3.0	CC:	aos-bugs, mfojtik
Target Milestone:	---
Target Release:	4.3.0
Hardware:	All
OS:	All
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Last Closed:	2020-01-23 11:18:15 UTC	Type:	Bug
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Description Cesar Wong 2019-12-09 01:39:45 UTC

Description of problem:
For hosted deployments, the Kubernetes API server that the OpenShift API server communicates with is not the in-cluster server, but rather an explicit kubeconfig must be specified. Recent changes in the OpenShift APIserver code only allow for the in-cluster connection to the Kube API server. CLI flags need to be exposed to allow specifying a different kubeconfig to communicate with an external Kube API server.

Version-Release number of selected component (if applicable):
4.3

How reproducible:
Always

Steps to Reproduce:
1. Start OpenShift APIServer in hosted mode (on management Kube APIserver)

Actual results:
OpenShift APIServer fails to start because it cannot communicate with a Kube APIServer

Expected results:
OpenShift APIServer starts and communicates with peer Kube APIServer.

Additional info:
To verify this, simply run the openshift-apiserver command with --help. There should be flags to allow specifying the authentication and authorization kube apiserver.

Comment 2 Xingxing Xia 2019-12-12 03:18:29 UTC

Per above hint and https://github.com/openshift/openshift-apiserver/pull/54/files#diff-3f6215a8bff8638652a2886ff35d2b5bR88 `o.Authentication.AddFlags(flags)`, and openshift/openshift-apiserver/vendor/k8s.io/apiserver/pkg/server/options/{authentication,authorization}.go def of `AddFlags`, confirmed the verification in 4.3.0-0.nightly-2019-12-10-235659 by:
oc rsh -n openshift-apiserver ds/apiserver
sh-4.2# openshift-apiserver start --help
Start an apiserver that contains the OpenShift resources
...
Flags:
      --authentication-kubeconfig string                        kubeconfig file pointing at the 'core' kubernetes server with enough rights to create tokenaccessreviews.authentication.k8s.io.
...
      --authorization-kubeconfig string                         kubeconfig file pointing at the 'core' kubernetes server with enough rights to create subjectaccessreviews.authorization.k8s.io.

Comment 4 errata-xmlrpc 2020-01-23 11:18:15 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:0062