Wait for apiserver to become healthy before starting agent controllers

It is possible that the apiserver may serve read requests but not allow writes yet, in which case flannel will crash on startup when trying to configure the subnet manager. Fix this by waiting for the apiserver to become fully ready before starting flannel and the network policy controller. Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

Wait for apiserver to become healthy before starting agent controllers
f970e49b · Brad Davidson · Brad Davidson · 9b39c1c1 · f970e49b
Commit f970e49b authored Feb 26, 2021 by Brad Davidson Committed by Brad Davidson Feb 26, 2021
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run.go pkg/agent/run.go +4 -0

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--- a/pkg/agent/run.go
+++ b/pkg/agent/run.go
@@ -35,6 +35,7 @@ import (
 	"k8s.io/client-go/kubernetes"
 	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	"k8s.io/client-go/tools/clientcmd"
+	"k8s.io/controller-manager/app"
 )

 var (
@@ -98,6 +99,9 @@ func run(ctx context.Context, cfg cmds.Agent, proxy proxy.Proxy) error {
 	if err != nil {
 		return err
 	}
+
+	app.WaitForAPIServer(coreClient, 30*time.Second)
+
 	if !nodeConfig.NoFlannel {
 		if err := flannel.Run(ctx, nodeConfig, coreClient.CoreV1().Nodes()); err != nil {
 			return err