Golang platform.CreateNClusterMembers函数代码示例

// Start 5 services that conflict with one another. Assert that only
// 3 of the 5 are started.
func TestScheduleGlobalConflicts(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a simple three-node cluster
	if err := platform.CreateNClusterMembers(cluster, 3, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	machines, err := cluster.WaitForNMachines(3)
	if err != nil {
		t.Fatal(err)
	}

	// Ensure we can SSH into each machine using fleetctl
	for _, machine := range machines {
		if _, _, err := cluster.Fleetctl("--strict-host-key-checking=false", "ssh", machine, "uptime"); err != nil {
			t.Errorf("Unable to SSH into fleet machine: %v", err)
		}
	}

	for i := 0; i < 5; i++ {
		unit := fmt.Sprintf("fixtures/units/conflict.%d.service", i)
		_, _, err := cluster.Fleetctl("start", "--no-block", unit)
		if err != nil {
			t.Errorf("Failed starting unit %s: %v", unit, err)
		}
	}

	// All 5 services should be visible immediately and 3 should become
	// ACTIVE shortly thereafter
	stdout, _, err := cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 5 {
		t.Fatalf("Did not find five units in cluster: \n%s", stdout)
	}
	states, err := cluster.WaitForNActiveUnits(3)
	if err != nil {
		t.Fatal(err)
	}

	machineSet := make(map[string]bool)

	for unit, unitState := range states {
		if len(unitState.Machine) == 0 {
			t.Errorf("Unit %s is not reporting machine", unit)
		}

		machineSet[unitState.Machine] = true
	}

	if len(machineSet) != 3 {
		t.Errorf("3 active units not running on 3 unique machines")
	}
}

// TestUnitRunnable is the simplest test possible, deplying a single-node
// cluster and ensuring a unit can enter an 'active' state
func TestUnitRunnable(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	if err := platform.CreateNClusterMembers(cluster, 1, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(1)
	if err != nil {
		t.Fatal(err)
	}

	if stdout, stderr, err := cluster.Fleetctl("start", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to start fleet unit: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	units, err := cluster.WaitForNActiveUnits(1)
	if err != nil {
		t.Fatal(err)
	}
	_, found := units["hello.service"]
	if len(units) != 1 || !found {
		t.Fatalf("Expected hello.service to be sole active unit, got %v", units)
	}
}

func TestScheduleGlobalUnits(t *testing.T) {
	// Create a three-member cluster
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)
	members, err := platform.CreateNClusterMembers(cluster, 3)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	machines, err := cluster.WaitForNMachines(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	// Launch a couple of simple units
	stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", "fixtures/units/hello.service", "fixtures/units/goodbye.service")
	if err != nil {
		t.Fatalf("Failed starting units: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	// Both units should show up active
	_, err = cluster.WaitForNActiveUnits(m0, 2)
	if err != nil {
		t.Fatal(err)
	}

	// Now add a global unit
	stdout, stderr, err = cluster.Fleetctl(m0, "start", "--no-block", "fixtures/units/global.service")
	if err != nil {
		t.Fatalf("Failed starting unit: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	// Should see 2 + 3 units
	states, err := cluster.WaitForNActiveUnits(m0, 5)
	if err != nil {
		t.Fatal(err)
	}

	// Each machine should have a single global unit
	us := states["global.service"]
	for _, mach := range machines {
		var found bool
		for _, state := range us {
			if state.Machine == mach {
				found = true
				break
			}
		}
		if !found {
			t.Fatalf("Did not find global unit on machine %v", mach)
			t.Logf("Found unit states:")
			for _, state := range states {
				t.Logf("%#v", state)
			}
		}
	}
}

// Ensure units can be scheduled directly to a given machine using the
// MachineID unit option.
func TestScheduleConditionMachineID(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	// Start with a simple three-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 3)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	machines, err := cluster.WaitForNMachines(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	// Start 3 units that are each scheduled to one of our machines
	schedule := make(map[string]string)
	for _, machine := range machines {
		contents := `
[Service]
ExecStart=/bin/bash -c "while true; do echo Hello, World!; sleep 1; done"

[X-Fleet]
MachineID=%s
`
		unitFile, err := util.TempUnit(fmt.Sprintf(contents, machine))
		if err != nil {
			t.Fatalf("Failed creating temporary unit: %v", err)
		}
		defer os.Remove(unitFile)

		stdout, stderr, err := cluster.Fleetctl(m0, "start", unitFile)
		if err != nil {
			t.Fatalf("Failed starting unit file %s: \nstdout: %s\nstderr: %s\nerr: %v", unitFile, stdout, stderr, err)
		}

		unit := filepath.Base(unitFile)
		schedule[unit] = machine
	}

	// Block until our three units have been started
	active, err := cluster.WaitForNActiveUnits(m0, 3)
	if err != nil {
		t.Fatal(err)
	}
	states, err := util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	for unit, unitState := range states {
		if unitState.Machine != schedule[unit] {
			t.Errorf("Unit %s was scheduled to %s, expected %s", unit, unitState.Machine, schedule[unit])
		}
	}
}

func TestUnitSubmit(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	if err := platform.CreateNClusterMembers(cluster, 1, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(1)
	if err != nil {
		t.Fatal(err)
	}

	// submit a unit and assert it shows up
	if _, _, err := cluster.Fleetctl("submit", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to submit fleet unit: %v", err)
	}
	stdout, _, err := cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 1 {
		t.Fatalf("Did not find 1 unit in cluster: \n%s", stdout)
	}

	// submitting the same unit should not fail
	if _, _, err = cluster.Fleetctl("submit", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Expected no failure when double-submitting unit, got this: %v", err)
	}

	// destroy the unit and ensure it disappears from the unit list
	if _, _, err := cluster.Fleetctl("destroy", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Failed to destroy unit: %v", err)
	}
	stdout, _, err = cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	if strings.TrimSpace(stdout) != "" {
		t.Fatalf("Did not find 0 units in cluster: \n%s", stdout)
	}

	// submitting the unit after destruction should succeed
	if _, _, err := cluster.Fleetctl("submit", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to submit fleet unit: %v", err)
	}
	stdout, _, err = cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units = strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 1 {
		t.Fatalf("Did not find 1 unit in cluster: \n%s", stdout)
	}
}

func TestKnownHostsVerification(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	members, err := platform.CreateNClusterMembers(cluster, 2)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	machines, err := cluster.WaitForNMachines(m0, 2)
	if err != nil {
		t.Fatal(err)
	}
	machine := machines[0]

	tmp, err := ioutil.TempFile(os.TempDir(), "known-hosts")
	if err != nil {
		t.Fatal(err)
	}
	tmp.Close()
	defer syscall.Unlink(tmp.Name())

	khFile := tmp.Name()

	if stdout, stderr, err := cluster.FleetctlWithInput(m0, "yes", "--strict-host-key-checking=true", fmt.Sprintf("--known-hosts-file=%s", khFile), "ssh", machine, "uptime"); err != nil {
		t.Errorf("Unable to SSH into fleet machine: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	_, err = cluster.ReplaceMember(members[1])
	if err != nil {
		t.Fatalf("Failed replacing machine: %v", err)
	}

	machines, err = cluster.WaitForNMachines(m0, 2)
	if err != nil {
		t.Fatal(err)
	}
	machine = machines[0]

	// SSH'ing to the cluster member should now fail with a host key mismatch
	if _, _, err := cluster.Fleetctl(m0, "--strict-host-key-checking=true", fmt.Sprintf("--known-hosts-file=%s", khFile), "ssh", machine, "uptime"); err == nil {
		t.Errorf("Expected error while SSH'ing to fleet machine")
	}

	// Overwrite the known-hosts file to simulate removing the old host key
	if err := ioutil.WriteFile(khFile, []byte{}, os.FileMode(0644)); err != nil {
		t.Fatalf("Unable to overwrite known-hosts file: %v", err)
	}

	// And SSH should work again
	if stdout, stderr, err := cluster.FleetctlWithInput(m0, "yes", "--strict-host-key-checking=true", fmt.Sprintf("--known-hosts-file=%s", khFile), "ssh", machine, "uptime"); err != nil {
		t.Errorf("Unable to SSH into fleet machine: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

}

func TestUnitSSHActions(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	if err := platform.CreateNClusterMembers(cluster, 1, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(1)
	if err != nil {
		t.Fatal(err)
	}

	if _, _, err := cluster.Fleetctl("start", "--no-block", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to start fleet unit: %v", err)
	}

	units, err := cluster.WaitForNActiveUnits(1)
	if err != nil {
		t.Fatal(err)
	}

	_, found := units["hello.service"]
	if len(units) != 1 || !found {
		t.Fatalf("Expected hello.service to be sole active unit, got %v", units)
	}

	stdout, _, err := cluster.Fleetctl("--strict-host-key-checking=false", "ssh", "hello.service", "echo", "foo")
	if err != nil {
		t.Errorf("Failure occurred while calling fleetctl ssh: %v", err)
	}

	if !strings.Contains(stdout, "foo") {
		t.Errorf("Could not find expected string in command output:\n%s", stdout)
	}

	stdout, _, err = cluster.Fleetctl("--strict-host-key-checking=false", "status", "hello.service")
	if err != nil {
		t.Errorf("Failure occurred while calling fleetctl status: %v", err)
	}

	if !strings.Contains(stdout, "Active: active") {
		t.Errorf("Could not find expected string in status output:\n%s", stdout)
	}

	stdout, _, err = cluster.Fleetctl("--strict-host-key-checking=false", "journal", "hello.service")
	if err != nil {
		t.Errorf("Failure occurred while calling fleetctl journal: %v", err)
	}

	if !strings.Contains(stdout, "Hello, World!") {
		t.Errorf("Could not find expected string in journal output:\n%s", stdout)
	}
}

func TestScheduleOneWayConflict(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a simple three-node cluster
	if err := platform.CreateNClusterMembers(cluster, 1, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	if _, err := cluster.WaitForNMachines(1); err != nil {
		t.Fatal(err)
	}

	// Start a unit that conflicts with a yet-to-be-scheduled unit
	name := "fixtures/units/conflicts-with-hello.service"
	if _, _, err := cluster.Fleetctl("start", name); err != nil {
		t.Fatalf("Failed starting unit %s: %v", name, err)
	}

	// Start a unit that has not defined conflicts
	name = "fixtures/units/hello.service"
	if _, _, err := cluster.Fleetctl("start", name); err == nil {
		t.Fatalf("Unit %s unexpectedly started", name)
	}

	// Both units should show up, but only conflicts-with-hello.service
	// should report ACTIVE
	stdout, _, err := cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 2 {
		t.Fatalf("Did not find two units in cluster: \n%s", stdout)
	}
	states, err := cluster.WaitForNActiveUnits(1)
	if err != nil {
		t.Fatal(err)
	}

	for unit, _ := range states {
		if unit != "conflicts-with-hello.service" {
			t.Error("Incorrect unit started:", unit)
		}
	}
}

func TestScheduleOneWayConflict(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	// Start with a simple three-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 1)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	if _, err := cluster.WaitForNMachines(m0, 1); err != nil {
		t.Fatal(err)
	}

	// Start a unit that conflicts with a yet-to-be-scheduled unit
	name := "fixtures/units/conflicts-with-hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	active, err := cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err := util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	// Start a unit that has not defined conflicts
	name = "fixtures/units/hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	// Both units should show up, but only conflicts-with-hello.service
	// should report ACTIVE
	stdout, _, err := cluster.Fleetctl(m0, "list-unit-files", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-unit-files: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 2 {
		t.Fatalf("Did not find two units in cluster: \n%s", stdout)
	}
	active, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err = util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	for unit := range states {
		if unit != "conflicts-with-hello.service" {
			t.Error("Incorrect unit started:", unit)
		}
	}

	// Destroying the conflicting unit should allow the other to start
	name = "conflicts-with-hello.service"
	if _, _, err := cluster.Fleetctl(m0, "destroy", name); err != nil {
		t.Fatalf("Failed destroying %s", name)
	}

	// NOTE: we need to sleep here shortly to avoid occasional errors of
	// conflicts-with-hello.service being rescheduled even after being destroyed.
	// In that case, the conflicts unit remains active, while the original
	// hello.service remains inactive. Then the test TestScheduleOneWayConflict
	// fails at the end with a message "Incorrect unit started".
	// This error seems to occur frequently when enable_grpc turned on.
	// - dpark 20160615
	time.Sleep(1 * time.Second)

	// Wait for the destroyed unit to actually disappear
	timeout, err := util.WaitForState(
		func() bool {
			stdout, _, err := cluster.Fleetctl(m0, "list-units", "--no-legend", "--full", "--fields", "unit,active,machine")
			if err != nil {
				return false
			}
			lines := strings.Split(strings.TrimSpace(stdout), "\n")
			states := util.ParseUnitStates(lines)
			for _, state := range states {
				if state.Name == name {
					return false
				}
			}
			return true
		},
	)
	if err != nil {
		t.Fatalf("Destroyed unit %s not gone within %v", name, timeout)
	}

	active, err = cluster.WaitForNActiveUnits(m0, 1)
//.........这里部分代码省略.........

// Start three machines and test template units based on machines Metadata
func TestTemplatesWithSpecifiersInMetadata(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	members, err := platform.CreateNClusterMembers(cluster, 3)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	_, err = cluster.WaitForNMachines(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	// Submit one template
	if stdout, stderr, err := cluster.Fleetctl(m0, "submit", "fixtures/units/[email protected]"); err != nil {
		t.Fatalf("Unable to submit [email protected] template: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	// Start units based on template in backward order
	for i := len(members) - 1; i >= 0; i-- {
		if stdout, stderr, err := cluster.Fleetctl(m0, "start", fmt.Sprintf("fixtures/units/[email protected]%s.service", members[i].ID())); err != nil {
			t.Fatalf("Unable to start template based unit: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
		}
	}

	_, err = cluster.WaitForNActiveUnits(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	stdout, stderr, err := cluster.Fleetctl(m0, "list-units", "--no-legend", "--full", "--fields", "unit,active,machine")
	if err != nil {
		t.Fatalf("Unable to get submitted units: \nstdout: %s\nstderr: %s\nerr: %v", stdout, stderr, err)
	}

	ndesired := 3
	stdout = strings.TrimSpace(stdout)
	lines := strings.Split(stdout, "\n")
	allStates := util.ParseUnitStates(lines)
	active := util.FilterActiveUnits(allStates)
	nactive := len(active)
	if nactive != ndesired {
		t.Fatalf("Failed to get %d active units: \nstdout: %s\nstderr: %s", ndesired, stdout, stderr)
	}

	for _, state := range active {
		re := regexp.MustCompile(`@([^.]*)`)
		desiredMachine := re.FindStringSubmatch(state.Name)
		if len(desiredMachine) < 2 {
			t.Fatalf("Cannot parse state.Name (%v): \nstdout: %s\nstderr: %s", state.Name, stdout, stderr)
		}
		currentMachine := fmt.Sprintf("smoke%s", state.Machine)
		if desiredMachine[1] != currentMachine {
			t.Fatalf("Template (%s) has been scheduled on wrong machine (%s): \nstdout: %s\nstderr: %s", state.Name, currentMachine, stdout, stderr)
		}
	}

	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--block-attempts=20", "fixtures/units/[email protected]"); err == nil {
		t.Fatalf("[email protected] unit should not be scheduled: \nstdout: %s\nstderr: %s", stdout, stderr)
	}
}

// Ensure an existing unit migrates to an unoccupied machine
// if its host goes down.
func TestDynamicClusterNewMemberUnitMigration(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a 4-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 4)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	if _, err = cluster.WaitForNMachines(m0, 4); err != nil {
		t.Fatal(err)
	}

	// Start 3 conflicting units on the 4-node cluster
	_, _, err = cluster.Fleetctl(m0, "start",
		"fixtures/units/conflict.0.service",
		"fixtures/units/conflict.1.service",
		"fixtures/units/conflict.2.service",
	)
	if err != nil {
		t.Errorf("Failed starting units: %v", err)
	}

	// All 3 services should be visible immediately, and all of them should
	// become ACTIVE shortly thereafter
	stdout, _, err := cluster.Fleetctl(m0, "list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 3 {
		t.Fatalf("Did not find 3 units in cluster: \n%s", stdout)
	}
	active, err := cluster.WaitForNActiveUnits(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	// Ensure each unit is only running on a single machine
	states, err := util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	// Kill one of the machines and make sure the unit migrates somewhere else
	unit := "conflict.1.service"
	oldMach := states[unit].Machine
	oldIP := states[unit].IP
	if _, _, err = cluster.Fleetctl(m0, "--strict-host-key-checking=false", "ssh", oldMach, "sudo", "systemctl", "stop", "fleet"); err != nil {
		t.Fatal(err)
	}
	var mN platform.Member
	if m0.IP() == oldIP {
		mN = members[1]
	} else {
		mN = m0
	}

	if _, err = cluster.WaitForNMachines(mN, 3); err != nil {
		t.Fatal(err)
	}
	newActive, err := cluster.WaitForNActiveUnits(mN, 3)
	if err != nil {
		t.Fatal(err)
	}
	// Ensure each unit is only running on a single machine
	newStates, err := util.ActiveToSingleStates(newActive)
	if err != nil {
		t.Fatal(err)
	}

	newMach := newStates[unit].Machine
	if newMach == oldMach {
		t.Fatalf("Unit %s did not migrate from machine %s to %s", unit, oldMach, newMach)
	}

	// Ensure no other units migrated due to this churn
	if newMach == states["conflict.0.service"].Machine || newMach == states["conflict.2.service"].Machine {
		t.Errorf("Unit %s landed on occupied machine", unit)
	}

	if states["conflict.0.service"].Machine != newStates["conflict.0.service"].Machine || states["conflict.2.service"].Machine != newStates["conflict.2.service"].Machine {
		t.Errorf("Unit caused unnecessary churn in the cluster")
	}
}

// Simulate rebooting a single member of a fleet cluster
func TestDynamicClusterMemberReboot(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a simple three-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 3)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	if _, err = cluster.WaitForNMachines(m0, 3); err != nil {
		t.Fatal(err)
	}

	_, _, err = cluster.Fleetctl(m0, "start",
		"fixtures/units/conflict.0.service",
		"fixtures/units/conflict.1.service",
		"fixtures/units/conflict.2.service",
	)
	if err != nil {
		t.Errorf("Failed starting units: %v", err)
	}

	// All 3 services should be visible immediately, and all of them should
	// become ACTIVE shortly thereafter
	stdout, _, err := cluster.Fleetctl(m0, "list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 3 {
		t.Fatalf("Did not find 3 units in cluster: \n%s", stdout)
	}
	oldActive, err := cluster.WaitForNActiveUnits(m0, 3)
	if err != nil {
		t.Fatal(err)
	}

	oldStates, err := util.ActiveToSingleStates(oldActive)
	if err != nil {
		t.Fatal(err)
	}

	// Simulate a reboot by recreating one of the cluster members
	if _, err := cluster.ReplaceMember(cluster.Members()[1]); err != nil {
		t.Fatalf("replace failed: %v", err)
	}
	newActive, err := cluster.WaitForNActiveUnits(m0, 3)
	if err != nil {
		t.Fatal(err)
	}
	newStates, err := util.ActiveToSingleStates(newActive)
	if err != nil {
		t.Fatal(err)
	}

	migrated := 0
	for _, unit := range []string{"conflict.0.service", "conflict.1.service", "conflict.2.service"} {
		if oldStates[unit].Machine != newStates[unit].Machine {
			migrated += 1
		}
	}

	if migrated != 1 {
		t.Errorf("Expected 1 unit to migrate, but found %d", migrated)
		t.Logf("Initial state: %#v", oldStates)
		t.Logf("Post-reboot state: %#v", newStates)
	}
}

func TestScheduleOneWayConflict(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a simple three-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 1)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	if _, err := cluster.WaitForNMachines(m0, 1); err != nil {
		t.Fatal(err)
	}

	// Start a unit that conflicts with a yet-to-be-scheduled unit
	name := "fixtures/units/conflicts-with-hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	active, err := cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err := util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	// Start a unit that has not defined conflicts
	name = "fixtures/units/hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	// Both units should show up, but only conflicts-with-hello.service
	// should report ACTIVE
	stdout, _, err := cluster.Fleetctl(m0, "list-unit-files", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-unit-files: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 2 {
		t.Fatalf("Did not find two units in cluster: \n%s", stdout)
	}
	active, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err = util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	for unit := range states {
		if unit != "conflicts-with-hello.service" {
			t.Error("Incorrect unit started:", unit)
		}
	}

	// Destroying the conflicting unit should allow the other to start
	name = "conflicts-with-hello.service"
	if _, _, err := cluster.Fleetctl(m0, "destroy", name); err != nil {
		t.Fatalf("Failed destroying %s", name)
	}
	// TODO(jonboulle): fix this race. Since we no longer immediately
	// remove unit state on unit destruction (and instead wait for
	// UnitStateGenerator/UnitStatePublisher to clean up), the old unit
	// shows up as active for quite some time.
	time.Sleep(5 * time.Second)
	stdout, _, err = cluster.Fleetctl(m0, "list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units = strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 1 {
		t.Fatalf("Did not find one unit in cluster: \n%s", stdout)
	}
	active, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err = util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}
	for unit := range states {
		if unit != "hello.service" {
			t.Error("Incorrect unit started:", unit)
		}
	}

}

// Simulate rebooting a single member of a fleet cluster
func TestDynamicClusterMemberReboot(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy()

	// Start with a simple three-node cluster
	if err := platform.CreateNClusterMembers(cluster, 3, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	if _, err = cluster.WaitForNMachines(3); err != nil {
		t.Fatal(err)
	}

	if _, _, err := cluster.Fleetctl("start",
		"fixtures/units/conflict.0.service",
		"fixtures/units/conflict.1.service",
		"fixtures/units/conflict.2.service",
	); err != nil {
		t.Errorf("Failed starting units: %v", err)
	}

	// All 3 services should be visible immediately, and all of them should
	// become ACTIVE shortly thereafter
	stdout, _, err := cluster.Fleetctl("list-units", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-units: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 3 {
		t.Fatalf("Did not find 3 units in cluster: \n%s", stdout)
	}
	oldStates, err := cluster.WaitForNActiveUnits(3)
	if err != nil {
		t.Fatal(err)
	}

	// Simulate a reboot by recreating one of the cluster members
	member := cluster.Members()[1]
	if _, err = cluster.MemberCommand(member, "sudo", "systemctl", "stop", "fleet"); err != nil {
		t.Fatal(err)
	}
	if err = cluster.DestroyMember(member); err != nil {
		t.Fatal(err)
	}
	if _, err = cluster.WaitForNMachines(2); err != nil {
		t.Fatal(err)
	}
	if _, err = cluster.WaitForNActiveUnits(2); err != nil {
		t.Fatal(err)
	}
	if err = cluster.CreateMember(member, platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	if _, err = cluster.WaitForNMachines(3); err != nil {
		t.Fatal(err)
	}
	newStates, err := cluster.WaitForNActiveUnits(3)
	if err != nil {
		t.Fatal(err)
	}

	for _, unit := range []string{"conflict.0.service", "conflict.1.service", "conflict.2.service"} {
		if oldStates[unit].Machine != newStates[unit].Machine {
			t.Fatalf("Unit %s migrated unexpectedly", unit)
		}
	}
}

func TestScheduleOneWayConflict(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	// Start with a simple three-node cluster
	members, err := platform.CreateNClusterMembers(cluster, 1)
	if err != nil {
		t.Fatal(err)
	}
	m0 := members[0]
	if _, err := cluster.WaitForNMachines(m0, 1); err != nil {
		t.Fatal(err)
	}

	// Start a unit that conflicts with a yet-to-be-scheduled unit
	name := "fixtures/units/conflicts-with-hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	active, err := cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err := util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	// Start a unit that has not defined conflicts
	name = "fixtures/units/hello.service"
	if stdout, stderr, err := cluster.Fleetctl(m0, "start", "--no-block", name); err != nil {
		t.Fatalf("Failed starting unit %s: \nstdout: %s\nstderr: %s\nerr: %v", name, stdout, stderr, err)
	}

	// Both units should show up, but only conflicts-with-hello.service
	// should report ACTIVE
	stdout, _, err := cluster.Fleetctl(m0, "list-unit-files", "--no-legend")
	if err != nil {
		t.Fatalf("Failed to run list-unit-files: %v", err)
	}
	units := strings.Split(strings.TrimSpace(stdout), "\n")
	if len(units) != 2 {
		t.Fatalf("Did not find two units in cluster: \n%s", stdout)
	}
	active, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err = util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}

	for unit := range states {
		if unit != "conflicts-with-hello.service" {
			t.Error("Incorrect unit started:", unit)
		}
	}

	// Destroying the conflicting unit should allow the other to start
	name = "conflicts-with-hello.service"
	if _, _, err := cluster.Fleetctl(m0, "destroy", name); err != nil {
		t.Fatalf("Failed destroying %s", name)
	}

	// Wait for the destroyed unit to actually disappear
	timeout, err := util.WaitForState(
		func() bool {
			stdout, _, err := cluster.Fleetctl(m0, "list-units", "--no-legend", "--full", "--fields", "unit,active,machine")
			if err != nil {
				return false
			}
			lines := strings.Split(strings.TrimSpace(stdout), "\n")
			states := util.ParseUnitStates(lines)
			for _, state := range states {
				if state.Name == name {
					return false
				}
			}
			return true
		},
	)
	if err != nil {
		t.Fatalf("Destroyed unit %s not gone within %v", name, timeout)
	}

	active, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}
	states, err = util.ActiveToSingleStates(active)
	if err != nil {
		t.Fatal(err)
	}
	for unit := range states {
		if unit != "hello.service" {
//.........这里部分代码省略.........