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Merge pull request #6531 from priyawadhwa/kic-preload-images
Provide images with pre-loaded Kubernetes images & binaries
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| Copyright 2020 The Kubernetes Authors All rights reserved. | ||
| 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 | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| 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. | ||
| */ | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "fmt" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| const ( | ||
| profile = "generate-preloaded-images-tar" | ||
| minikubePath = "out/minikube" | ||
| ) | ||
|
|
||
| var ( | ||
| kubernetesVersion = "" | ||
| tarballFilename = "" | ||
| ) | ||
|
|
||
| func init() { | ||
| flag.StringVar(&kubernetesVersion, "kubernetes-version", "", "desired kubernetes version, for example `v1.17.2`") | ||
| flag.Parse() | ||
| tarballFilename = fmt.Sprintf("preloaded-images-k8s-%s.tar", kubernetesVersion) | ||
| } | ||
|
|
||
| func main() { | ||
| if err := executePreloadImages(); err != nil { | ||
| fmt.Println(err) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
|
||
| func executePreloadImages() error { | ||
| defer func() { | ||
| if err := deleteMinikube(); err != nil { | ||
| fmt.Println(err) | ||
| } | ||
| }() | ||
| if err := startMinikube(); err != nil { | ||
| return err | ||
| } | ||
| if err := createImageTarball(); err != nil { | ||
| return err | ||
| } | ||
| return copyTarballToHost() | ||
| } | ||
|
|
||
| func startMinikube() error { | ||
| cmd := exec.Command(minikubePath, "start", "-p", profile, "--memory", "4000", "--kubernetes-version", kubernetesVersion, "--wait=false") | ||
| cmd.Stdout = os.Stdout | ||
| return cmd.Run() | ||
| } | ||
|
|
||
| func createImageTarball() error { | ||
| cmd := exec.Command(minikubePath, "ssh", "-p", profile, "--", "sudo", "tar", "cvf", tarballFilename, "/var/lib/docker", "/var/lib/minikube/binaries") | ||
| cmd.Stdout = os.Stdout | ||
| return cmd.Run() | ||
| } | ||
|
|
||
| func copyTarballToHost() error { | ||
| sshKey, err := runCmd([]string{minikubePath, "ssh-key", "-p", profile}) | ||
| if err != nil { | ||
| return errors.Wrap(err, "getting ssh-key") | ||
| } | ||
|
|
||
| ip, err := runCmd([]string{minikubePath, "ip", "-p", profile}) | ||
| if err != nil { | ||
| return errors.Wrap(err, "getting ip") | ||
| } | ||
|
|
||
| dest := filepath.Join("out/", tarballFilename) | ||
| args := []string{"scp", "-o", "StrictHostKeyChecking=no", "-i", string(sshKey), fmt.Sprintf("docker@%s:/home/docker/%s", ip, tarballFilename), dest} | ||
| _, err = runCmd(args) | ||
| return err | ||
| } | ||
|
|
||
| func deleteMinikube() error { | ||
| cmd := exec.Command(minikubePath, "delete", "-p", profile) | ||
| cmd.Stdout = os.Stdout | ||
| return cmd.Run() | ||
| } | ||
|
|
||
| func runCmd(command []string) (string, error) { | ||
| cmd := exec.Command(command[0], command[1:]...) | ||
| output, err := cmd.Output() | ||
| return strings.Trim(string(output), "\n "), err | ||
| } |