Fix issue where service healthcheck is `{}` in remote API

This fix tries to address the issue raised in 30178 where
service healthcheck is `{}` in remote API will result in
dns resolve failue.

The reason was that when service healthcheck is `{}`,
service binding was not done.

This fix fixes the issue.

An integration test has been added.

This fix fixes 30178.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
(cherry picked from commit 8feb5c5a48eaadc1686e3b370f7ef9be128dd3cb)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>

daemon/cluster/executor/container/controller.go

@@ -205,7 +205,7 @@ func (r *controller) Start(ctx context.Context) error {
 	}
 
 	// no health check
-	if ctnr.Config == nil || ctnr.Config.Healthcheck == nil {
+	if ctnr.Config == nil || ctnr.Config.Healthcheck == nil || len(ctnr.Config.Healthcheck.Test) == 0 || ctnr.Config.Healthcheck.Test[0] == "NONE" {
 		if err := r.adapter.activateServiceBinding(); err != nil {
 			log.G(ctx).WithError(err).Errorf("failed to activate service binding for container %s which has no healthcheck config", r.adapter.container.name())
 			return err
@@ -213,12 +213,6 @@ func (r *controller) Start(ctx context.Context) error {
 		return nil
 	}
 
-	healthCmd := ctnr.Config.Healthcheck.Test
-
-	if len(healthCmd) == 0 || healthCmd[0] == "NONE" {
-		return nil
-	}
-
 	// wait for container to be healthy
 	eventq := r.adapter.events(ctx)
 

integration-cli/docker_api_swarm_test.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/swarm"
 	"github.com/docker/docker/pkg/integration/checker"
 	"github.com/go-check/check"
@@ -1365,3 +1366,26 @@ func (s *DockerSwarmSuite) TestAPIDuplicateNetworks(c *check.C) {
 
 	c.Assert(r2.Scope, checker.Equals, "swarm")
 }
+
+// Test case for 30178
+func (s *DockerSwarmSuite) TestAPISwarmHealthcheckNone(c *check.C) {
+	d := s.AddDaemon(c, true, true)
+
+	out, err := d.Cmd("network", "create", "-d", "overlay", "lb")
+	c.Assert(err, checker.IsNil, check.Commentf(out))
+
+	instances := 1
+	d.createService(c, simpleTestService, setInstances(instances), func(s *swarm.Service) {
+		s.Spec.TaskTemplate.ContainerSpec.Healthcheck = &container.HealthConfig{}
+		s.Spec.TaskTemplate.Networks = []swarm.NetworkAttachmentConfig{
+			{Target: "lb"},
+		}
+	})
+
+	waitAndAssert(c, defaultReconciliationTimeout, d.checkActiveContainerCount, checker.Equals, instances)
+
+	containers := d.activeContainers()
+
+	out, err = d.Cmd("exec", containers[0], "ping", "-c1", "-W3", "top")
+	c.Assert(err, checker.IsNil, check.Commentf(out))
+}