Adds a wait to account for the possiblity of a not ready unix socket

cmd/multus-daemon/main.go

@@ -28,7 +28,6 @@ import (
 	"path/filepath"
 	"sync"
 	"syscall"
-	"time"
 
 	utilwait "k8s.io/apimachinery/pkg/util/wait"
 
@@ -113,7 +112,7 @@ func main() {
 
 	// Wait until daemon ready
 	logging.Verbosef("API readiness check")
-	if waitUntilAPIReady(daemonConf.SocketDir) != nil {
+	if api.WaitUntilAPIReady(daemonConf.SocketDir) != nil {
 		logging.Panicf("failed to ready multus-daemon socket: %v", err)
 		os.Exit(1)
 	}
@@ -140,16 +139,6 @@ func main() {
 	logging.Verbosef("multus daemon is exited")
 }
 
-func waitUntilAPIReady(socketPath string) error {
-	apiReadyPollDuration := 100 * time.Millisecond
-	apiReadyPollTimeout := 1000 * time.Millisecond
-
-	return utilwait.PollImmediate(apiReadyPollDuration, apiReadyPollTimeout, func() (bool, error) {
-		_, err := api.DoCNI(api.GetAPIEndpoint(api.MultusHealthAPIEndpoint), nil, api.SocketPath(socketPath))
-		return err == nil, nil
-	})
-}
-
 func startMultusDaemon(ctx context.Context, daemonConfig *srv.ControllerNetConf, ignoreReadinessIndicator bool) error {
 	if user, err := user.Current(); err != nil || user.Uid != "0" {
 		return fmt.Errorf("failed to run multus-daemon with root: %v, now running in uid: %s", err, user.Uid)

pkg/server/api/api.go

@@ -22,9 +22,17 @@ import (
 	"net"
 	"net/http"
 	"strings"
+	"time"
+
+	utilwait "k8s.io/apimachinery/pkg/util/wait"
 )
 
 const (
+	// APIReadyPollDuration specifies duration for API readiness check polling
+	APIReadyPollDuration = 100 * time.Millisecond
+	// APIReadyPollTimeout specifies timeout for API readiness check polling
+	APIReadyPollTimeout = 60000 * time.Millisecond
+
 	// MultusCNIAPIEndpoint is an endpoint for multus CNI request (for multus-shim)
 	MultusCNIAPIEndpoint = "/cni"
 	// MultusDelegateAPIEndpoint is an endpoint for multus delegate request (for hotplug)
@@ -88,3 +96,11 @@ func CreateDelegateRequest(cniCommand, cniContainerID, cniNetNS, cniIFName, podN
 		InterfaceAttributes: interfaceAttributes,
 	}
 }
+
+// WaitUntilAPIReady checks API readiness
+func WaitUntilAPIReady(socketPath string) error {
+	return utilwait.PollImmediate(APIReadyPollDuration, APIReadyPollTimeout, func() (bool, error) {
+		_, err := DoCNI(GetAPIEndpoint(MultusHealthAPIEndpoint), nil, SocketPath(socketPath))
+		return err == nil, nil
+	})
+}

pkg/server/api/shim.go

@@ -24,6 +24,8 @@ import (
 	cnitypes "github.com/containernetworking/cni/pkg/types"
 
 	"gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/logging"
+
+	utilwait "k8s.io/apimachinery/pkg/util/wait"
 )
 
 // ShimNetConf for the SHIM cni config file written in json
@@ -77,12 +79,21 @@ func postRequest(args *skel.CmdArgs) (*Response, string, error) {
 		return nil, "", fmt.Errorf("invalid CNI configuration passed to multus-shim: %w", err)
 	}
 
+	// check API readiness
+	if err := WaitUntilAPIReady(multusShimConfig.MultusSocketDir); err != nil {
+		return nil, multusShimConfig.CNIVersion, err
+	}
+
 	cniRequest, err := newCNIRequest(args)
 	if err != nil {
 		return nil, multusShimConfig.CNIVersion, err
 	}
 
-	body, err := DoCNI("http://dummy/cni", cniRequest, SocketPath(multusShimConfig.MultusSocketDir))
+	var body []byte
+	err = utilwait.PollImmediate(APIReadyPollDuration, APIReadyPollTimeout, func() (bool, error) {
+		body, err = DoCNI("http://dummy/cni", cniRequest, SocketPath(multusShimConfig.MultusSocketDir))
+		return err == nil, nil
+	})
 	if err != nil {
 		return nil, multusShimConfig.CNIVersion, err
 	}