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pijob.go
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pijob.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"os"
"time"
batchv1 "k8s.io/api/batch/v1"
apiv1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
var clientset *kubernetes.Clientset
const jobName = "test-job-clientgo"
const cronJobName = "test-cronjob-clientgo"
const hardCodedNamespace = "ollie"
func init() {
kubeconfig := flag.String("kubeconfig", "/home/ollie/.kube/config", "location to your kubeconfig file")
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
// handle error
fmt.Printf("erorr %s building config from flags\n", err.Error())
config, err = rest.InClusterConfig()
if err != nil {
fmt.Printf("error %s, getting inclusterconfig", err.Error())
}
}
flag.Parse()
clientset, err = kubernetes.NewForConfig(config)
if err != nil {
log.Fatal(err)
}
}
func createJob() {
fmt.Println("creating job", jobName)
// This is so ArgoCD can track jobs that are spawned from inside this go program:
// https://argo-cd.readthedocs.io/en/stable/user-guide/resource_tracking/
LabelsMap := map[string]string{
"app.kubernetes.io/instance": os.Getenv("APPNAME"),
}
jobsClient := clientset.BatchV1().Jobs(hardCodedNamespace)
job := &batchv1.Job{ObjectMeta: metav1.ObjectMeta{
Name: jobName,
Labels: LabelsMap,
},
Spec: batchv1.JobSpec{
Template: apiv1.PodTemplateSpec{
Spec: apiv1.PodSpec{
Containers: []apiv1.Container{
{
Name: "pi",
Image: "perl:5.34.0",
Command: []string{"perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"},
},
},
RestartPolicy: apiv1.RestartPolicyNever,
},
},
},
}
_, err := jobsClient.Create(context.Background(), job, metav1.CreateOptions{})
if err != nil {
log.Fatal("failed to create job", err)
}
fmt.Println("created job successfully")
}
func main() {
createJob()
// Sleep for a while to pretend we are a running service
time.Sleep(300 * time.Second)
}