legacyprovider.go

Documentation: k8s.io/kubernetes/pkg/controller/nodeipam

     1  //go:build !providerless
     2  // +build !providerless
     3  
     4  /*
     5  Copyright 2019 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package nodeipam
    21  
    22  import (
    23  	"context"
    24  	"fmt"
    25  	"net"
    26  
    27  	coreinformers "k8s.io/client-go/informers/core/v1"
    28  	clientset "k8s.io/client-go/kubernetes"
    29  	cloudprovider "k8s.io/cloud-provider"
    30  	"k8s.io/klog/v2"
    31  
    32  	"k8s.io/kubernetes/pkg/controller/nodeipam/ipam"
    33  	nodesync "k8s.io/kubernetes/pkg/controller/nodeipam/ipam/sync"
    34  )
    35  
    36  func createLegacyIPAM(
    37  	ctx context.Context,
    38  	ic *Controller,
    39  	nodeInformer coreinformers.NodeInformer,
    40  	cloud cloudprovider.Interface,
    41  	kubeClient clientset.Interface,
    42  	clusterCIDRs []*net.IPNet,
    43  	serviceCIDR *net.IPNet,
    44  	nodeCIDRMaskSizes []int,
    45  ) (*ipam.Controller, error) {
    46  	cfg := &ipam.Config{
    47  		Resync:       ipamResyncInterval,
    48  		MaxBackoff:   ipamMaxBackoff,
    49  		InitialRetry: ipamInitialBackoff,
    50  	}
    51  	switch ic.allocatorType {
    52  	case ipam.IPAMFromClusterAllocatorType:
    53  		cfg.Mode = nodesync.SyncFromCluster
    54  	case ipam.IPAMFromCloudAllocatorType:
    55  		cfg.Mode = nodesync.SyncFromCloud
    56  	}
    57  
    58  	// we may end up here with no cidr at all in case of FromCloud/FromCluster
    59  	var cidr *net.IPNet
    60  	if len(clusterCIDRs) > 0 {
    61  		cidr = clusterCIDRs[0]
    62  	}
    63  	logger := klog.FromContext(ctx)
    64  	if len(clusterCIDRs) > 1 {
    65  		logger.Info("Multiple cidrs were configured with FromCluster or FromCloud. cidrs except first one were discarded")
    66  	}
    67  	ipamc, err := ipam.NewController(ctx, cfg, kubeClient, cloud, cidr, serviceCIDR, nodeCIDRMaskSizes[0])
    68  	if err != nil {
    69  		return nil, fmt.Errorf("error creating ipam controller: %w", err)
    70  	}
    71  	if err := ipamc.Start(logger, nodeInformer); err != nil {
    72  		return nil, fmt.Errorf("error trying to Init(): %w", err)
    73  	}
    74  	return ipamc, nil
    75  }
    76
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