@@ -170,7 +170,7 @@ func getExecExitCode(ctx context.Context, client apiclient.ContainerAPIClient, e

 	resp, err := client.ContainerExecInspect(ctx, execID)

 	if err != nil {

 		// If we can't connect, then the daemon probably died.

-		if err != apiclient.ErrConnectionFailed {

+		if !apiclient.IsErrConnectionFailed(err) {

 			return false, -1, err

 		}

 		return false, -1, nil

@@ -91,7 +91,7 @@ func getExitCode(ctx context.Context, dockerCli *command.DockerCli, containerID

 	c, err := dockerCli.Client().ContainerInspect(ctx, containerID)

 	if err != nil {

 		// If we can't connect, then the daemon probably died.

-		if err != clientapi.ErrConnectionFailed {

+		if !clientapi.IsErrConnectionFailed(err) {

 			return false, -1, err

 		}

 		return false, -1, nil

@@ -1,18 +1,34 @@

 package client

 import (

-	"errors"

 	"fmt"

 	"github.com/docker/docker/api/types/versions"

+	"github.com/pkg/errors"

 )

-// ErrConnectionFailed is an error raised when the connection between the client and the server failed.

-var ErrConnectionFailed = errors.New("Cannot connect to the Docker daemon. Is the docker daemon running on this host?")

+// errConnectionFailed implements an error returned when connection failed.

+type errConnectionFailed struct {

+	host string

+}

+

+// Error returns a string representation of an errConnectionFailed

+func (err errConnectionFailed) Error() string {

+	if err.host == "" {

+		return "Cannot connect to the Docker daemon. Is the docker daemon running on this host?"

+	}

+	return fmt.Sprintf("Cannot connect to the Docker daemon at %s. Is the docker daemon running?", err.host)

+}

+

+// IsErrConnectionFailed returns true if the error is caused by connection failed.

+func IsErrConnectionFailed(err error) bool {

+	_, ok := errors.Cause(err).(errConnectionFailed)

+	return ok

+}

 // ErrorConnectionFailed returns an error with host in the error message when connection to docker daemon failed.

 func ErrorConnectionFailed(host string) error {

-	return fmt.Errorf("Cannot connect to the Docker daemon at %s. Is the docker daemon running?", host)

+	return errConnectionFailed{host: host}

 }

 type notFound interface {