mirror of
https://github.com/k3s-io/kubernetes.git
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99 lines
4.2 KiB
Go
99 lines
4.2 KiB
Go
/*
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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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// The external controller manager is responsible for running controller loops that
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// are cloud provider dependent. It uses the API to listen to new events on resources.
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// This file should be written by each cloud provider.
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// For a minimal working example, please refer to k8s.io/cloud-provider/sample/basic_main.go
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// For more details, please refer to k8s.io/kubernetes/cmd/cloud-controller-manager/main.go
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// The current file demonstrate how other cloud provider should leverage CCM and it uses fake parameters. Please modify for your own use.
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package main
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import (
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"os"
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"k8s.io/apimachinery/pkg/util/wait"
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cloudprovider "k8s.io/cloud-provider"
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"k8s.io/cloud-provider/app"
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cloudcontrollerconfig "k8s.io/cloud-provider/app/config"
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"k8s.io/cloud-provider/options"
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"k8s.io/component-base/cli"
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cliflag "k8s.io/component-base/cli/flag"
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_ "k8s.io/component-base/metrics/prometheus/clientgo" // load all the prometheus client-go plugins
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_ "k8s.io/component-base/metrics/prometheus/version" // for version metric registration
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"k8s.io/klog/v2"
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// For existing cloud providers, the option to import legacy providers is still available.
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// e.g. _"k8s.io/legacy-cloud-providers/<provider>"
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)
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func main() {
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ccmOptions, err := options.NewCloudControllerManagerOptions()
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if err != nil {
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klog.Fatalf("unable to initialize command options: %v", err)
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}
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controllerInitializers := app.DefaultInitFuncConstructors
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// Here is an example to remove the controller which is not needed.
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// e.g. remove the cloud-node-lifecycle controller which current cloud provider does not need.
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//delete(controllerInitializers, "cloud-node-lifecycle")
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// Here is an example to add an controller(NodeIpamController) which will be used by cloud provider
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// generate nodeIPAMConfig. Here is an sample code.
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// If you do not need additional controller, please ignore.
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nodeIpamController := nodeIPAMController{}
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nodeIpamController.nodeIPAMControllerOptions.NodeIPAMControllerConfiguration = &nodeIpamController.nodeIPAMControllerConfiguration
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fss := cliflag.NamedFlagSets{}
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nodeIpamController.nodeIPAMControllerOptions.AddFlags(fss.FlagSet("nodeipam controller"))
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controllerInitializers["nodeipam"] = app.ControllerInitFuncConstructor{
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// "node-controller" is the shared identity of all node controllers, including node, node lifecycle, and node ipam.
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// See https://github.com/kubernetes/kubernetes/pull/72764#issuecomment-453300990 for more context.
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InitContext: app.ControllerInitContext{
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ClientName: "node-controller",
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},
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Constructor: nodeIpamController.StartNodeIpamControllerWrapper,
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}
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command := app.NewCloudControllerManagerCommand(ccmOptions, cloudInitializer, controllerInitializers, fss, wait.NeverStop)
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code := cli.Run(command)
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os.Exit(code)
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}
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func cloudInitializer(config *cloudcontrollerconfig.CompletedConfig) cloudprovider.Interface {
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cloudConfig := config.ComponentConfig.KubeCloudShared.CloudProvider
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// initialize cloud provider with the cloud provider name and config file provided
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cloud, err := cloudprovider.InitCloudProvider(cloudConfig.Name, cloudConfig.CloudConfigFile)
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if err != nil {
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klog.Fatalf("Cloud provider could not be initialized: %v", err)
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}
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if cloud == nil {
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klog.Fatalf("Cloud provider is nil")
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}
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if !cloud.HasClusterID() {
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if config.ComponentConfig.KubeCloudShared.AllowUntaggedCloud {
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klog.Warning("detected a cluster without a ClusterID. A ClusterID will be required in the future. Please tag your cluster to avoid any future issues")
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} else {
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klog.Fatalf("no ClusterID found. A ClusterID is required for the cloud provider to function properly. This check can be bypassed by setting the allow-untagged-cloud option")
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}
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}
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return cloud
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}
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