Add a service generator and a command to easily expose services. #3592
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| /* | ||
| Copyright 2014 Google Inc. All rights reserved. | ||
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| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| 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 | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package cmd | ||
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| import ( | ||
| "fmt" | ||
| "io" | ||
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| "github.com/GoogleCloudPlatform/kubernetes/pkg/api" | ||
| "github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
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| func (f *Factory) NewCmdExposeService(out io.Writer) *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "expose <name> --port=<port> [--protocol=TCP|UDP] [--container-port=<number-or-name>] [--service-name=<name>] [--public-ip=<ip>] [--create-external-load-balancer]", | ||
| Short: "Take a replicated application and expose it as Kubernetes Service", | ||
| Long: `Take a replicated application and expose it as Kubernetes Service. | ||
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| Looks up a ReplicationController named <name>, and uses the selector for that replication controller | ||
| as the selector for a new Service which services on <port> | ||
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| Examples: | ||
| $ kubectl expose nginx --port=80 --container-port=8000 | ||
| <creates a service for a replicated nginx, which serves on port 80 and connects to the containers on port 8000> | ||
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| $ kubectl expose streamer --port=4100 --protocol=udp --service-name=video-stream | ||
| <create a service for a replicated streaming application on port 4100 balancing UDP traffic and is named 'video-stream'> | ||
| `, | ||
| Run: func(cmd *cobra.Command, args []string) { | ||
| if len(args) != 1 { | ||
| usageError(cmd, "<name> is required for expose") | ||
| } | ||
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| namespace, err := f.DefaultNamespace(cmd) | ||
| checkErr(err) | ||
| client, err := f.Client(cmd) | ||
| checkErr(err) | ||
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| rc, err := client.ReplicationControllers(namespace).Get(args[0]) | ||
| checkErr(err) | ||
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| generatorName := GetFlagString(cmd, "generator") | ||
| generator, found := kubectl.Generators[generatorName] | ||
| if !found { | ||
| usageError(cmd, fmt.Sprintf("Generator: %s not found.", generator)) | ||
| } | ||
| if GetFlagInt(cmd, "port") < 1 { | ||
| usageError(cmd, "--port is required and must be a positive integer.") | ||
| } | ||
| names := generator.ParamNames() | ||
| params := kubectl.MakeParams(cmd, names) | ||
| if len(GetFlagString(cmd, "service-name")) == 0 { | ||
| params["name"] = args[0] | ||
| } else { | ||
| params["name"] = GetFlagString(cmd, "service-name") | ||
| } | ||
| if _, found := params["selector"]; !found { | ||
| params["selector"] = kubectl.MakeLabels(rc.Spec.Selector) | ||
| } | ||
| if GetFlagBool(cmd, "create-external-load-balancer") { | ||
| params["create-external-load-balancer"] = "true" | ||
| } | ||
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| err = kubectl.ValidateParams(names, params) | ||
| checkErr(err) | ||
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| service, err := generator.Generate(params) | ||
| checkErr(err) | ||
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| inline := GetFlagString(cmd, "overrides") | ||
| if len(inline) > 0 { | ||
| Merge(service, inline, "Service") | ||
| } | ||
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| // TODO: extract this flag to a central location, when such a location exists. | ||
| if !GetFlagBool(cmd, "dry-run") { | ||
| service, err = client.Services(namespace).Create(service.(*api.Service)) | ||
| checkErr(err) | ||
| } | ||
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| err = PrintObject(cmd, service, f, out) | ||
| checkErr(err) | ||
| }, | ||
| } | ||
| AddPrinterFlags(cmd) | ||
| cmd.Flags().String("generator", "service/v1", "The name of the api generator that you want to use. Default 'service/v1'") | ||
| cmd.Flags().String("protocol", "TCP", "The network protocol for the service you want to be created. Default 'tcp'") | ||
| cmd.Flags().Int("port", -1, "The port that the service should serve on. Required.") | ||
| cmd.Flags().Bool("create-external-load-balancer", false, "If true, create an external load balancer for this service. Implementation is cloud provider dependent. Default false") | ||
| cmd.Flags().String("selector", "", "A label selector to use for this service. If empty (the default) infer the selector from the replication controller") | ||
| cmd.Flags().Bool("dry-run", false, "If true, only print the object that would be sent, don't actually do anything") | ||
| cmd.Flags().String("container-port", "", "Name or number for the port on the container that the service should direct traffic to. Optional.") | ||
| cmd.Flags().String("public-ip", "", "Name of a public ip address to set for the service. The service will be assigned this IP in addition to its generated service IP.") | ||
| cmd.Flags().String("overrides", "", "An inline JSON override for the generated object. If this is non-empty, it is parsed used to override the generated object. Requires that the object supply a valid apiVersion field.") | ||
| cmd.Flags().String("service-name", "", "The name for the newly created service.") | ||
| return cmd | ||
| } |
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Did you intend to remove this? It's included in the other help dumps.
If we keep it, it should say
run-containerrather than justrun.There was a problem hiding this comment.
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restored.