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simple-game-server: Adds a graceful termination delay (#3436)
* simple-game-server: Adds a graceful termination delay * Adds `gracefulTerminationDelaySec` to imitate a gameserver delaying after SIGTERM (eviction). * Adds test/eviction/evictpod.go, which I used to test the above. This should allow easier testing in autoscaling scenarios (including eventually possibly e2e tests with eviction: safe: Always).
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2023 Google LLC 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 | ||
|
|
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| // evictpod.go --pod <pod> --namespace <namespace> initiates a pod eviction | ||
| // using the k8s eviction API. | ||
| package main | ||
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|
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| import ( | ||
| "context" | ||
| "flag" | ||
| "log" | ||
| "path/filepath" | ||
|
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| policy "k8s.io/api/policy/v1" | ||
| meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "k8s.io/client-go/util/homedir" | ||
| ) | ||
|
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| // Borrowed from https://stackoverflow.com/questions/62803041/how-to-evict-or-delete-pods-from-kubernetes-using-golang-client | ||
| func evictPod(ctx context.Context, client *kubernetes.Clientset, name, namespace string) error { | ||
| return client.PolicyV1().Evictions(namespace).Evict(ctx, &policy.Eviction{ | ||
| ObjectMeta: meta_v1.ObjectMeta{ | ||
| Name: name, | ||
| Namespace: namespace, | ||
| }}) | ||
| } | ||
|
|
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| func main() { | ||
| ctx := context.Background() | ||
|
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| kubeconfig := flag.String("kubeconfig", filepath.Join(homedir.HomeDir(), ".kube", "config"), "(optional) absolute path to the kubeconfig file") | ||
| namespace := flag.String("namespace", "default", "Namespace (defaults to `default`)") | ||
| pod := flag.String("pod", "", "Pod name (required)") | ||
| flag.Parse() | ||
|
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| if *pod == "" { | ||
| log.Fatal("--pod must be non-empty") | ||
| } | ||
|
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| config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig) | ||
| if err != nil { | ||
| log.Fatalf("Could not build config: %v", err) | ||
| } | ||
|
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| kubeClient, err := kubernetes.NewForConfig(config) | ||
| if err != nil { | ||
| log.Fatalf("Could not create the kubernetes clientset: %v", err) | ||
| } | ||
|
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| if err := evictPod(ctx, kubeClient, *pod, *namespace); err != nil { | ||
| log.Fatalf("Pod eviction failed: %v", err) | ||
| } | ||
| } |