mirror of https://github.com/k3s-io/k3s
49 lines
1.8 KiB
Go
49 lines
1.8 KiB
Go
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/*
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Copyright 2016 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 master
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import (
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"fmt"
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"net"
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"k8s.io/klog"
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kubeoptions "k8s.io/kubernetes/pkg/kubeapiserver/options"
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"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
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)
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// DefaultServiceIPRange takes a the serviceIPRange flag and returns the defaulted service ip range (if needed),
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// api server service IP, and an error
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func DefaultServiceIPRange(passedServiceClusterIPRange net.IPNet) (net.IPNet, net.IP, error) {
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serviceClusterIPRange := passedServiceClusterIPRange
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if passedServiceClusterIPRange.IP == nil {
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klog.Infof("Network range for service cluster IPs is unspecified. Defaulting to %v.", kubeoptions.DefaultServiceIPCIDR)
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serviceClusterIPRange = kubeoptions.DefaultServiceIPCIDR
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}
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if size := ipallocator.RangeSize(&serviceClusterIPRange); size < 8 {
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return net.IPNet{}, net.IP{}, fmt.Errorf("The service cluster IP range must be at least %d IP addresses", 8)
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}
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// Select the first valid IP from ServiceClusterIPRange to use as the GenericAPIServer service IP.
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apiServerServiceIP, err := ipallocator.GetIndexedIP(&serviceClusterIPRange, 1)
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if err != nil {
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return net.IPNet{}, net.IP{}, err
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}
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klog.V(4).Infof("Setting service IP to %q (read-write).", apiServerServiceIP)
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return serviceClusterIPRange, apiServerServiceIP, nil
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}
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