52 lines
1.9 KiB
Go
52 lines
1.9 KiB
Go
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/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package node
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import (
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"fmt"
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certsapi "k8s.io/api/certificates/v1beta1"
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clientset "k8s.io/client-go/kubernetes"
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)
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// ValidateAPIServer makes sure the server we're connecting to supports the Beta Certificates API
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func ValidateAPIServer(client clientset.Interface) error {
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version, err := client.Discovery().ServerVersion()
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if err != nil {
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return fmt.Errorf("failed to check server version: %v", err)
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}
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fmt.Printf("[bootstrap] Detected server version: %s\n", version.String())
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// Check certificates API. If the server supports the version of the Certificates API we're using, we're good to go
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serverGroups, err := client.Discovery().ServerGroups()
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if err != nil {
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return fmt.Errorf("certificate API check failed: failed to retrieve a list of supported API objects [%v]", err)
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}
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for _, group := range serverGroups.Groups {
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if group.Name == certsapi.SchemeGroupVersion.Group {
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for _, version := range group.Versions {
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if version.Version == certsapi.SchemeGroupVersion.Version {
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fmt.Printf("[bootstrap] The server supports the Certificates API (%s/%s)\n", certsapi.SchemeGroupVersion.Group, certsapi.SchemeGroupVersion.Version)
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return nil
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}
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}
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}
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}
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return fmt.Errorf("certificate API check failed: API server with version %s doesn't support Certificates API (%s/%s), use v1.6.0 or newer",
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version.String(), certsapi.SchemeGroupVersion.Group, certsapi.SchemeGroupVersion.Version)
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}
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