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Fix for kube-proxy to wait for some duration for the node to be defined

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Kube-proxy must atleast wait for some duration for the node to defined so that it can fetch the node IP. This node IP is currently used in ipvs proxier for the node-port services.
This commit is contained in:
Subrata Paul 2019-04-28 00:25:18 +05:30
parent 54240ce5ba
commit dd9402f451
2 changed files with 26 additions and 8 deletions
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3
cmd/kube-proxy/app/server_others.go
View File

@ -143,6 +143,9 @@ func newProxyServer(
nodeIP := net.ParseIP(config.BindAddress)
if nodeIP.IsUnspecified() {
nodeIP = utilnode.GetNodeIP(client, hostname)
if nodeIP == nil {
return nil, fmt.Errorf("unable to get node IP for hostname %s", hostname)
}
}
if proxyMode == proxyModeIPTables {
klog.V(0).Info("Using iptables Proxier.")

31
pkg/util/node/node.go
View File

@ -30,6 +30,7 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
v1core "k8s.io/client-go/kubernetes/typed/core/v1"
)
@ -106,17 +107,31 @@ func GetNodeHostIP(node *v1.Node) (net.IP, error) {
}
// GetNodeIP returns the ip of node with the provided hostname
// If required, wait for the node to be defined.
func GetNodeIP(client clientset.Interface, hostname string) net.IP {
var nodeIP net.IP
node, err := client.CoreV1().Nodes().Get(hostname, metav1.GetOptions{})
if err != nil {
klog.Warningf("Failed to retrieve node info: %v", err)
return nil
backoff := wait.Backoff {
Steps: 5,
Duration: 1 * time.Second,
Factor: 2.0,
Jitter: 0.2,
}
nodeIP, err = GetNodeHostIP(node)
if err != nil {
klog.Warningf("Failed to retrieve node IP: %v", err)
return nil
err := wait.ExponentialBackoff(backoff, func() (bool, error) {
node, err := client.CoreV1().Nodes().Get(hostname, metav1.GetOptions{})
if err != nil {
klog.Errorf("Failed to retrieve node info: %v", err)
return false, nil
}
nodeIP, err = GetNodeHostIP(node)
if err != nil {
klog.Errorf("Failed to retrieve node IP: %v", err)
return false, err
}
return true, nil
})
if err == nil {
klog.Infof("Successfully retrieved node IP: %v", nodeIP)
}
return nodeIP
}