killCatcher

killCatcher

Simple go module for detecting the pod deletion from Kubernetes cluster

How to use it

Integration of this go module is quite simple. Inside your main, define killCatcher instance, and call Listen() in separate goroutine. It is up to you how you will manage those goroutines.

In this example, we will use errorGroup.

func main(){
    kc := killCatcher.New(postSigterm)
    var eg errgroup.Group
    eg.Go(killCatcher.Listen)
    eg.Go(yourApp)
    if err := eg.Wait(); err != nil {
        fmt.Printf("Got error in one of the goroutines : %v\n", err)
        os.Exit(1)
    }
    os.Exit(0)
}

func postSigterm() error{
    //logic to execute after SIGTERM
}

func yourApp() error {
    //main logic of your app
}

Lastly, do not forget to define terminationGracePeriodSeconds in you manifest file. By default, its set to 30s, however, this might not suit your needs. Example can be found here.