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https://github.com/k3s-io/k3s.git
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46 lines
1.7 KiB
Go
46 lines
1.7 KiB
Go
/*
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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 util
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import (
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"fmt"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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// FromApiserverCache modifies <opts> so that the GET request will
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// be served from apiserver cache instead of from etcd.
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func FromApiserverCache(opts *metav1.GetOptions) {
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opts.ResourceVersion = "0"
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}
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// GetNodenameForKernel gets hostname value to set in the hostname field (the nodename field of struct utsname) of the pod.
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func GetNodenameForKernel(hostname string, hostDomainName string, setHostnameAsFQDN *bool) (string, error) {
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kernelHostname := hostname
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// FQDN has to be 64 chars to fit in the Linux nodename kernel field (specification 64 chars and the null terminating char).
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const fqdnMaxLen = 64
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if len(hostDomainName) > 0 && setHostnameAsFQDN != nil && *setHostnameAsFQDN {
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fqdn := fmt.Sprintf("%s.%s", hostname, hostDomainName)
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// FQDN has to be shorter than hostnameMaxLen characters.
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if len(fqdn) > fqdnMaxLen {
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return "", fmt.Errorf("failed to construct FQDN from pod hostname and cluster domain, FQDN %s is too long (%d characters is the max, %d characters requested)", fqdn, fqdnMaxLen, len(fqdn))
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}
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kernelHostname = fqdn
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}
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return kernelHostname, nil
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}
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