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cmd/adapter: add signal handler

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Add a signal handler stopping the adapter if it receives a SIGINT or
SIGTERM signal. This prevent the prometheus-adapter pod from being stuck
in "Terminating" state.

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>
This commit is contained in:
Damien Grisonnet 2021-03-29 17:24:49 +02:00
parent 976c38aee4
commit 9db8d2f731
1 changed files with 6 additions and 4 deletions
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10
cmd/adapter/adapter.go
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@ -27,7 +27,6 @@ import (
"os"
"time"
"k8s.io/apimachinery/pkg/util/wait"
openapinamer "k8s.io/apiserver/pkg/endpoints/openapi"
genericapiserver "k8s.io/apiserver/pkg/server"
"k8s.io/client-go/rest"
@ -280,8 +279,11 @@ func main() {
klog.Fatalf("unable to load metrics discovery config: %v", err)
}
// stop channel closed on SIGTERM and SIGINT
stopCh := genericapiserver.SetupSignalHandler()
// construct the provider
cmProvider, err := cmd.makeProvider(promClient, wait.NeverStop)
cmProvider, err := cmd.makeProvider(promClient, stopCh)
if err != nil {
klog.Fatalf("unable to construct custom metrics provider: %v", err)
}
@ -292,7 +294,7 @@ func main() {
}
// construct the external provider
emProvider, err := cmd.makeExternalProvider(promClient, wait.NeverStop)
emProvider, err := cmd.makeExternalProvider(promClient, stopCh)
if err != nil {
klog.Fatalf("unable to construct external metrics provider: %v", err)
}
@ -308,7 +310,7 @@ func main() {
}
// run the server
if err := cmd.Run(wait.NeverStop); err != nil {
if err := cmd.Run(stopCh); err != nil {
klog.Fatalf("unable to run custom metrics adapter: %v", err)
}
}