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moby--moby/integration-cli/docker_api_swarm_service_test.go
Aaron Lehmann 1d274e9acf Change "service inspect" to show defaults in place of empty fields
This adds a new parameter insertDefaults to /services/{id}. When this is
set, an empty field (such as UpdateConfig) will be populated with
default values in the API response. Make "service inspect" use this, so
that empty fields do not result in missing information when inspecting a
service.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2017-04-10 13:41:16 -07:00

598 lines
22 KiB
Go

// +build !windows
package main
import (
"fmt"
"strconv"
"strings"
"syscall"
"time"
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/integration-cli/checker"
"github.com/docker/docker/integration-cli/daemon"
"github.com/go-check/check"
)
func setPortConfig(portConfig []swarm.PortConfig) daemon.ServiceConstructor {
return func(s *swarm.Service) {
if s.Spec.EndpointSpec == nil {
s.Spec.EndpointSpec = &swarm.EndpointSpec{}
}
s.Spec.EndpointSpec.Ports = portConfig
}
}
func (s *DockerSwarmSuite) TestAPIServiceUpdatePort(c *check.C) {
d := s.AddDaemon(c, true, true)
// Create a service with a port mapping of 8080:8081.
portConfig := []swarm.PortConfig{{TargetPort: 8081, PublishedPort: 8080}}
serviceID := d.CreateService(c, simpleTestService, setInstances(1), setPortConfig(portConfig))
waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)
// Update the service: changed the port mapping from 8080:8081 to 8082:8083.
updatedPortConfig := []swarm.PortConfig{{TargetPort: 8083, PublishedPort: 8082}}
remoteService := d.GetService(c, serviceID)
d.UpdateService(c, remoteService, setPortConfig(updatedPortConfig))
// Inspect the service and verify port mapping.
updatedService := d.GetService(c, serviceID)
c.Assert(updatedService.Spec.EndpointSpec, check.NotNil)
c.Assert(len(updatedService.Spec.EndpointSpec.Ports), check.Equals, 1)
c.Assert(updatedService.Spec.EndpointSpec.Ports[0].TargetPort, check.Equals, uint32(8083))
c.Assert(updatedService.Spec.EndpointSpec.Ports[0].PublishedPort, check.Equals, uint32(8082))
}
func (s *DockerSwarmSuite) TestAPISwarmServicesEmptyList(c *check.C) {
d := s.AddDaemon(c, true, true)
services := d.ListServices(c)
c.Assert(services, checker.NotNil)
c.Assert(len(services), checker.Equals, 0, check.Commentf("services: %#v", services))
}
func (s *DockerSwarmSuite) TestAPISwarmServicesCreate(c *check.C) {
d := s.AddDaemon(c, true, true)
instances := 2
id := d.CreateService(c, simpleTestService, setInstances(instances))
waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, instances)
// insertDefaults inserts UpdateConfig when service is fetched by ID
_, out, err := d.SockRequest("GET", "/services/"+id+"?insertDefaults=true", nil)
c.Assert(err, checker.IsNil, check.Commentf("%s", out))
c.Assert(string(out), checker.Contains, "UpdateConfig")
// insertDefaults inserts UpdateConfig when service is fetched by ID
_, out, err = d.SockRequest("GET", "/services/top?insertDefaults=true", nil)
c.Assert(err, checker.IsNil, check.Commentf("%s", out))
c.Assert(string(out), checker.Contains, "UpdateConfig")
service := d.GetService(c, id)
instances = 5
d.UpdateService(c, service, setInstances(instances))
waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, instances)
d.RemoveService(c, service.ID)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 0)
}
func (s *DockerSwarmSuite) TestAPISwarmServicesMultipleAgents(c *check.C) {
d1 := s.AddDaemon(c, true, true)
d2 := s.AddDaemon(c, true, false)
d3 := s.AddDaemon(c, true, false)
time.Sleep(1 * time.Second) // make sure all daemons are ready to accept tasks
instances := 9
id := d1.CreateService(c, simpleTestService, setInstances(instances))
waitAndAssert(c, defaultReconciliationTimeout, d1.CheckActiveContainerCount, checker.GreaterThan, 0)
waitAndAssert(c, defaultReconciliationTimeout, d2.CheckActiveContainerCount, checker.GreaterThan, 0)
waitAndAssert(c, defaultReconciliationTimeout, d3.CheckActiveContainerCount, checker.GreaterThan, 0)
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d2.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
// reconciliation on d2 node down
d2.Stop(c)
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
// test downscaling
instances = 5
d1.UpdateService(c, d1.GetService(c, id), setInstances(instances))
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
}
func (s *DockerSwarmSuite) TestAPISwarmServicesCreateGlobal(c *check.C) {
d1 := s.AddDaemon(c, true, true)
d2 := s.AddDaemon(c, true, false)
d3 := s.AddDaemon(c, true, false)
d1.CreateService(c, simpleTestService, setGlobalMode)
waitAndAssert(c, defaultReconciliationTimeout, d1.CheckActiveContainerCount, checker.Equals, 1)
waitAndAssert(c, defaultReconciliationTimeout, d2.CheckActiveContainerCount, checker.Equals, 1)
waitAndAssert(c, defaultReconciliationTimeout, d3.CheckActiveContainerCount, checker.Equals, 1)
d4 := s.AddDaemon(c, true, false)
d5 := s.AddDaemon(c, true, false)
waitAndAssert(c, defaultReconciliationTimeout, d4.CheckActiveContainerCount, checker.Equals, 1)
waitAndAssert(c, defaultReconciliationTimeout, d5.CheckActiveContainerCount, checker.Equals, 1)
}
func (s *DockerSwarmSuite) TestAPISwarmServicesUpdate(c *check.C) {
const nodeCount = 3
var daemons [nodeCount]*daemon.Swarm
for i := 0; i < nodeCount; i++ {
daemons[i] = s.AddDaemon(c, true, i == 0)
}
// wait for nodes ready
waitAndAssert(c, 5*time.Second, daemons[0].CheckNodeReadyCount, checker.Equals, nodeCount)
// service image at start
image1 := "busybox:latest"
// target image in update
image2 := "busybox:test"
// create a different tag
for _, d := range daemons {
out, err := d.Cmd("tag", image1, image2)
c.Assert(err, checker.IsNil, check.Commentf(out))
}
// create service
instances := 5
parallelism := 2
rollbackParallelism := 3
id := daemons[0].CreateService(c, serviceForUpdate, setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
// issue service update
service := daemons[0].GetService(c, id)
daemons[0].UpdateService(c, service, setImage(image2))
// first batch
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - parallelism, image2: parallelism})
// 2nd batch
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - 2*parallelism, image2: 2 * parallelism})
// 3nd batch
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image2: instances})
// Roll back to the previous version. This uses the CLI because
// rollback used to be a client-side operation.
out, err := daemons[0].Cmd("service", "update", "--rollback", id)
c.Assert(err, checker.IsNil, check.Commentf(out))
// first batch
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image2: instances - rollbackParallelism, image1: rollbackParallelism})
// 2nd batch
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
}
func (s *DockerSwarmSuite) TestAPISwarmServicesUpdateStartFirst(c *check.C) {
d := s.AddDaemon(c, true, true)
// service image at start
image1 := "busybox:latest"
// target image in update
image2 := "testhealth"
// service started from this image won't pass health check
_, _, err := d.BuildImageWithOut(image2,
`FROM busybox
HEALTHCHECK --interval=1s --timeout=1s --retries=1024\
CMD cat /status`,
true)
c.Check(err, check.IsNil)
// create service
instances := 5
parallelism := 2
rollbackParallelism := 3
id := d.CreateService(c, serviceForUpdate, setInstances(instances), setUpdateOrder(swarm.UpdateOrderStartFirst), setRollbackOrder(swarm.UpdateOrderStartFirst))
checkStartingTasks := func(expected int) []swarm.Task {
var startingTasks []swarm.Task
waitAndAssert(c, defaultReconciliationTimeout, func(c *check.C) (interface{}, check.CommentInterface) {
tasks := d.GetServiceTasks(c, id)
startingTasks = nil
for _, t := range tasks {
if t.Status.State == swarm.TaskStateStarting {
startingTasks = append(startingTasks, t)
}
}
return startingTasks, nil
}, checker.HasLen, expected)
return startingTasks
}
makeTasksHealthy := func(tasks []swarm.Task) {
for _, t := range tasks {
containerID := t.Status.ContainerStatus.ContainerID
d.Cmd("exec", containerID, "touch", "/status")
}
}
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
// issue service update
service := d.GetService(c, id)
d.UpdateService(c, service, setImage(image2))
// first batch
// The old tasks should be running, and the new ones should be starting.
startingTasks := checkStartingTasks(parallelism)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
// make it healthy
makeTasksHealthy(startingTasks)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - parallelism, image2: parallelism})
// 2nd batch
// The old tasks should be running, and the new ones should be starting.
startingTasks = checkStartingTasks(parallelism)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - parallelism, image2: parallelism})
// make it healthy
makeTasksHealthy(startingTasks)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - 2*parallelism, image2: 2 * parallelism})
// 3nd batch
// The old tasks should be running, and the new ones should be starting.
startingTasks = checkStartingTasks(1)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances - 2*parallelism, image2: 2 * parallelism})
// make it healthy
makeTasksHealthy(startingTasks)
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image2: instances})
// Roll back to the previous version. This uses the CLI because
// rollback is a client-side operation.
out, err := d.Cmd("service", "update", "--rollback", id)
c.Assert(err, checker.IsNil, check.Commentf(out))
// first batch
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image2: instances - rollbackParallelism, image1: rollbackParallelism})
// 2nd batch
waitAndAssert(c, defaultReconciliationTimeout, d.CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
}
func (s *DockerSwarmSuite) TestAPISwarmServicesFailedUpdate(c *check.C) {
const nodeCount = 3
var daemons [nodeCount]*daemon.Swarm
for i := 0; i < nodeCount; i++ {
daemons[i] = s.AddDaemon(c, true, i == 0)
}
// wait for nodes ready
waitAndAssert(c, 5*time.Second, daemons[0].CheckNodeReadyCount, checker.Equals, nodeCount)
// service image at start
image1 := "busybox:latest"
// target image in update
image2 := "busybox:badtag"
// create service
instances := 5
id := daemons[0].CreateService(c, serviceForUpdate, setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
// issue service update
service := daemons[0].GetService(c, id)
daemons[0].UpdateService(c, service, setImage(image2), setFailureAction(swarm.UpdateFailureActionPause), setMaxFailureRatio(0.25), setParallelism(1))
// should update 2 tasks and then pause
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceUpdateState(id), checker.Equals, swarm.UpdateStatePaused)
v, _ := daemons[0].CheckServiceRunningTasks(id)(c)
c.Assert(v, checker.Equals, instances-2)
// Roll back to the previous version. This uses the CLI because
// rollback used to be a client-side operation.
out, err := daemons[0].Cmd("service", "update", "--rollback", id)
c.Assert(err, checker.IsNil, check.Commentf(out))
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckRunningTaskImages, checker.DeepEquals,
map[string]int{image1: instances})
}
func (s *DockerSwarmSuite) TestAPISwarmServiceConstraintRole(c *check.C) {
const nodeCount = 3
var daemons [nodeCount]*daemon.Swarm
for i := 0; i < nodeCount; i++ {
daemons[i] = s.AddDaemon(c, true, i == 0)
}
// wait for nodes ready
waitAndAssert(c, 5*time.Second, daemons[0].CheckNodeReadyCount, checker.Equals, nodeCount)
// create service
constraints := []string{"node.role==worker"}
instances := 3
id := daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
// validate tasks are running on worker nodes
tasks := daemons[0].GetServiceTasks(c, id)
for _, task := range tasks {
node := daemons[0].GetNode(c, task.NodeID)
c.Assert(node.Spec.Role, checker.Equals, swarm.NodeRoleWorker)
}
//remove service
daemons[0].RemoveService(c, id)
// create service
constraints = []string{"node.role!=worker"}
id = daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
tasks = daemons[0].GetServiceTasks(c, id)
// validate tasks are running on manager nodes
for _, task := range tasks {
node := daemons[0].GetNode(c, task.NodeID)
c.Assert(node.Spec.Role, checker.Equals, swarm.NodeRoleManager)
}
//remove service
daemons[0].RemoveService(c, id)
// create service
constraints = []string{"node.role==nosuchrole"}
id = daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks created
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceTasks(id), checker.Equals, instances)
// let scheduler try
time.Sleep(250 * time.Millisecond)
// validate tasks are not assigned to any node
tasks = daemons[0].GetServiceTasks(c, id)
for _, task := range tasks {
c.Assert(task.NodeID, checker.Equals, "")
}
}
func (s *DockerSwarmSuite) TestAPISwarmServiceConstraintLabel(c *check.C) {
const nodeCount = 3
var daemons [nodeCount]*daemon.Swarm
for i := 0; i < nodeCount; i++ {
daemons[i] = s.AddDaemon(c, true, i == 0)
}
// wait for nodes ready
waitAndAssert(c, 5*time.Second, daemons[0].CheckNodeReadyCount, checker.Equals, nodeCount)
nodes := daemons[0].ListNodes(c)
c.Assert(len(nodes), checker.Equals, nodeCount)
// add labels to nodes
daemons[0].UpdateNode(c, nodes[0].ID, func(n *swarm.Node) {
n.Spec.Annotations.Labels = map[string]string{
"security": "high",
}
})
for i := 1; i < nodeCount; i++ {
daemons[0].UpdateNode(c, nodes[i].ID, func(n *swarm.Node) {
n.Spec.Annotations.Labels = map[string]string{
"security": "low",
}
})
}
// create service
instances := 3
constraints := []string{"node.labels.security==high"}
id := daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
tasks := daemons[0].GetServiceTasks(c, id)
// validate all tasks are running on nodes[0]
for _, task := range tasks {
c.Assert(task.NodeID, checker.Equals, nodes[0].ID)
}
//remove service
daemons[0].RemoveService(c, id)
// create service
constraints = []string{"node.labels.security!=high"}
id = daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
tasks = daemons[0].GetServiceTasks(c, id)
// validate all tasks are NOT running on nodes[0]
for _, task := range tasks {
c.Assert(task.NodeID, checker.Not(checker.Equals), nodes[0].ID)
}
//remove service
daemons[0].RemoveService(c, id)
constraints = []string{"node.labels.security==medium"}
id = daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks created
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceTasks(id), checker.Equals, instances)
// let scheduler try
time.Sleep(250 * time.Millisecond)
tasks = daemons[0].GetServiceTasks(c, id)
// validate tasks are not assigned
for _, task := range tasks {
c.Assert(task.NodeID, checker.Equals, "")
}
//remove service
daemons[0].RemoveService(c, id)
// multiple constraints
constraints = []string{
"node.labels.security==high",
fmt.Sprintf("node.id==%s", nodes[1].ID),
}
id = daemons[0].CreateService(c, simpleTestService, setConstraints(constraints), setInstances(instances))
// wait for tasks created
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceTasks(id), checker.Equals, instances)
// let scheduler try
time.Sleep(250 * time.Millisecond)
tasks = daemons[0].GetServiceTasks(c, id)
// validate tasks are not assigned
for _, task := range tasks {
c.Assert(task.NodeID, checker.Equals, "")
}
// make nodes[1] fulfills the constraints
daemons[0].UpdateNode(c, nodes[1].ID, func(n *swarm.Node) {
n.Spec.Annotations.Labels = map[string]string{
"security": "high",
}
})
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
tasks = daemons[0].GetServiceTasks(c, id)
for _, task := range tasks {
c.Assert(task.NodeID, checker.Equals, nodes[1].ID)
}
}
func (s *DockerSwarmSuite) TestAPISwarmServicePlacementPrefs(c *check.C) {
const nodeCount = 3
var daemons [nodeCount]*daemon.Swarm
for i := 0; i < nodeCount; i++ {
daemons[i] = s.AddDaemon(c, true, i == 0)
}
// wait for nodes ready
waitAndAssert(c, 5*time.Second, daemons[0].CheckNodeReadyCount, checker.Equals, nodeCount)
nodes := daemons[0].ListNodes(c)
c.Assert(len(nodes), checker.Equals, nodeCount)
// add labels to nodes
daemons[0].UpdateNode(c, nodes[0].ID, func(n *swarm.Node) {
n.Spec.Annotations.Labels = map[string]string{
"rack": "a",
}
})
for i := 1; i < nodeCount; i++ {
daemons[0].UpdateNode(c, nodes[i].ID, func(n *swarm.Node) {
n.Spec.Annotations.Labels = map[string]string{
"rack": "b",
}
})
}
// create service
instances := 4
prefs := []swarm.PlacementPreference{{Spread: &swarm.SpreadOver{SpreadDescriptor: "node.labels.rack"}}}
id := daemons[0].CreateService(c, simpleTestService, setPlacementPrefs(prefs), setInstances(instances))
// wait for tasks ready
waitAndAssert(c, defaultReconciliationTimeout, daemons[0].CheckServiceRunningTasks(id), checker.Equals, instances)
tasks := daemons[0].GetServiceTasks(c, id)
// validate all tasks are running on nodes[0]
tasksOnNode := make(map[string]int)
for _, task := range tasks {
tasksOnNode[task.NodeID]++
}
c.Assert(tasksOnNode[nodes[0].ID], checker.Equals, 2)
c.Assert(tasksOnNode[nodes[1].ID], checker.Equals, 1)
c.Assert(tasksOnNode[nodes[2].ID], checker.Equals, 1)
}
func (s *DockerSwarmSuite) TestAPISwarmServicesStateReporting(c *check.C) {
testRequires(c, SameHostDaemon)
testRequires(c, DaemonIsLinux)
d1 := s.AddDaemon(c, true, true)
d2 := s.AddDaemon(c, true, true)
d3 := s.AddDaemon(c, true, false)
time.Sleep(1 * time.Second) // make sure all daemons are ready to accept
instances := 9
d1.CreateService(c, simpleTestService, setInstances(instances))
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d2.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
getContainers := func() map[string]*daemon.Swarm {
m := make(map[string]*daemon.Swarm)
for _, d := range []*daemon.Swarm{d1, d2, d3} {
for _, id := range d.ActiveContainers() {
m[id] = d
}
}
return m
}
containers := getContainers()
c.Assert(containers, checker.HasLen, instances)
var toRemove string
for i := range containers {
toRemove = i
}
_, err := containers[toRemove].Cmd("stop", toRemove)
c.Assert(err, checker.IsNil)
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d2.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
containers2 := getContainers()
c.Assert(containers2, checker.HasLen, instances)
for i := range containers {
if i == toRemove {
c.Assert(containers2[i], checker.IsNil)
} else {
c.Assert(containers2[i], checker.NotNil)
}
}
containers = containers2
for i := range containers {
toRemove = i
}
// try with killing process outside of docker
pidStr, err := containers[toRemove].Cmd("inspect", "-f", "{{.State.Pid}}", toRemove)
c.Assert(err, checker.IsNil)
pid, err := strconv.Atoi(strings.TrimSpace(pidStr))
c.Assert(err, checker.IsNil)
c.Assert(syscall.Kill(pid, syscall.SIGKILL), checker.IsNil)
time.Sleep(time.Second) // give some time to handle the signal
waitAndAssert(c, defaultReconciliationTimeout, reducedCheck(sumAsIntegers, d1.CheckActiveContainerCount, d2.CheckActiveContainerCount, d3.CheckActiveContainerCount), checker.Equals, instances)
containers2 = getContainers()
c.Assert(containers2, checker.HasLen, instances)
for i := range containers {
if i == toRemove {
c.Assert(containers2[i], checker.IsNil)
} else {
c.Assert(containers2[i], checker.NotNil)
}
}
}