Golang platform.NewNspawnCluster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()

	m0, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(m0, 1)
	if err != nil {
		t.Fatal(err)
	}

	if stdout, stderr, err := cluster.Fleetctl(m0, "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(m0, 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)
	}
}

// TestUnitRestart checks if a unit becomes started and restarted successfully.
// First it starts a unit, and restarts the unit, verifies it's restarted.
func TestUnitRestart(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

	numUnits := 3

	// first start units before restarting them
	unitFiles, err := launchUnitsCmd(cluster, m, "start", numUnits)
	if err != nil {
		t.Fatal(err)
	}
	if err := checkListUnits(cluster, m, "start", unitFiles, numUnits); err != nil {
		t.Fatal(err)
	}

	// now restart
	if err := unitStartCommon(cluster, m, "restart", numUnits); err != nil {
		t.Fatal(err)
	}
}

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

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}

	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Send an invalid GET request, should return failure
	resp, err := getHTTPResponse("GET", m.Endpoint()+"/fleet/v1/machines?nextPageToken=EwBMLg==", "")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("Expected status %d, got %d.", http.StatusBadRequest, resp.StatusCode)
	}

	err = checkContentType(resp)
	if err != nil {
		t.Fatal(err)
	}
}

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

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}

	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Get a normal machine list, should return OK
	resp, err := getHTTPResponse("GET", m.Endpoint()+"/fleet/v1/machines", "")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
		t.Fatalf("Got HTTP response status %d.", resp.StatusCode)
	}

	err = checkContentType(resp)
	if err != nil {
		t.Fatal(err)
	}
}

// Check clean shutdown of fleetd under normal circumstances
func TestShutdown(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	m0, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(m0, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Stop the fleet process.
	if _, err = cluster.MemberCommand(m0, "sudo", "systemctl", "stop", "fleet"); err != nil {
		t.Fatal(err)
	}

	// Check expected state after stop.
	stdout, _ := cluster.MemberCommand(m0, "systemctl", "show", "--property=ActiveState", "fleet")
	if strings.TrimSpace(stdout) != "ActiveState=inactive" {
		t.Fatalf("Fleet unit not reported as inactive: %s", stdout)
	}
	stdout, _ = cluster.MemberCommand(m0, "systemctl", "show", "--property=Result", "fleet")
	if strings.TrimSpace(stdout) != "Result=success" {
		t.Fatalf("Result for fleet unit not reported as success: %s", stdout)
	}
}

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)
			}
		}
	}
}

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

	// Start with a single node and wait for it to come up
	m0, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	machines, err := cluster.WaitForNMachines(m0, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Start a unit and ensure it comes up quickly
	unit := fmt.Sprintf("fixtures/units/[email protected]%s.service", machines[0])
	_, _, err = cluster.Fleetctl(m0, "start", unit)
	if err != nil {
		t.Errorf("Failed starting unit: %v", err)
	}
	_, err = cluster.WaitForNActiveUnits(m0, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Create a second node, waiting for it
	m1, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	if _, err = cluster.WaitForNMachines(m0, 2); err != nil {
		t.Fatal(err)
	}

	// Stop the fleet process on the first member
	if _, err = cluster.MemberCommand(m0, "sudo", "systemctl", "stop", "fleet"); err != nil {
		t.Fatal(err)
	}

	// The first member should quickly remove itself from the published
	// list of cluster members
	if _, err = cluster.WaitForNMachines(m1, 1); err != nil {
		t.Fatal(err)
	}

	// State for the member's unit should be purged from the Registry
	if _, err = cluster.WaitForNActiveUnits(m1, 0); err != nil {
		t.Fatal(err)
	}

	// The member's unit should actually stop running, too
	stdout, _ := cluster.MemberCommand(m0, "sudo", "systemctl", "status", "hello.service")
	if !strings.Contains(stdout, "Active: inactive") {
		t.Fatalf("Unit hello.service not reported as inactive:\n%s\n", stdout)
	}
}

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

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

	// submit a unit and assert it shows up
	if _, _, err := cluster.Fleetctl(m, "submit", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to submit fleet unit: %v", err)
	}
	stdout, _, err := cluster.Fleetctl(m, "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(m, "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(m, "destroy", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Failed to destroy unit: %v", err)
	}
	stdout, _, err = cluster.Fleetctl(m, "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(m, "submit", "fixtures/units/hello.service"); err != nil {
		t.Fatalf("Unable to submit fleet unit: %v", err)
	}
	stdout, _, err = cluster.Fleetctl(m, "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 TestCluster(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatalf(err.Error())
	}
	defer cluster.DestroyAll()

	// Start with a simple three-node cluster
	if err := cluster.Create(3); err != nil {
		t.Fatalf(err.Error())
	}
	machines, err := waitForNMachines(3)
	if err != nil {
		t.Fatalf(err.Error())
	}

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

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

	// All 5 services should be visible immediately and become ACTIVE
	// shortly thereafter
	stdout, _, err := 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)
	}
	if err := waitForNActiveUnits(3); err != nil {
		t.Fatalf(err.Error())
	}

	// Add two more machines to the cluster and ensure the remaining
	// unscheduled services are picked up.
	if err := cluster.Create(2); err != nil {
		t.Fatalf(err.Error())
	}
	machines, err = waitForNMachines(5)
	if err != nil {
		t.Fatalf(err.Error())
	}
	if err := waitForNActiveUnits(5); err != nil {
		t.Fatalf(err.Error())
	}
}

// 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 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()

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}
	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

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

	units, err := cluster.WaitForNActiveUnits(m, 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(m, "--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(m, "--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(m, "--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)
	}
}

// TestListUnitFilesOrder simply checks if "fleetctl list-unit-files" returns
// an ordered list of units
func TestListUnitFilesOrder(t *testing.T) {
	cluster, err := platform.NewNspawnCluster("smoke")
	if err != nil {
		t.Fatal(err)
	}
	defer cluster.Destroy(t)

	m, err := cluster.CreateMember()
	if err != nil {
		t.Fatal(err)
	}

	_, err = cluster.WaitForNMachines(m, 1)
	if err != nil {
		t.Fatal(err)
	}

	// Combine units
	var units []string
	for i := 1; i <= 20; i++ {
		unit := fmt.Sprintf("fixtures/units/[email protected]%02d.service", i)
		stdout, stderr, err := cluster.Fleetctl(m, "submit", unit)
		if err != nil {
			t.Fatalf("Failed to submit a batch of units: \nstdout: %s\nstder: %s\nerr: %v", stdout, stderr, err)
		}
		units = append(units, unit)
	}

	// make sure that all unit files will show up
	_, err = cluster.WaitForNUnitFiles(m, 20)
	if err != nil {
		t.Fatal("Failed to run list-unit-files: %v", err)
	}

	stdout, _, err := cluster.Fleetctl(m, "list-unit-files", "--no-legend", "--fields", "unit")
	if err != nil {
		t.Fatal("Failed to run list-unit-files: %v", err)
	}

	outUnits := strings.Split(strings.TrimSpace(stdout), "\n")

	var sortable sort.StringSlice
	for _, name := range units {
		n := path.Base(name)
		sortable = append(sortable, n)
	}
	sortable.Sort()

	var inUnits []string
	for _, name := range sortable {
		inUnits = append(inUnits, name)
	}

	if !reflect.DeepEqual(inUnits, outUnits) {
		t.Fatalf("Failed to get a sorted list of units from list-unit-files")
	}
}

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

	if err := cluster.CreateMember("1", platform.MachineConfig{}); err != nil {
		t.Fatal(err)
	}
	machines, err := cluster.WaitForNMachines(1)
	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 _, _, err := cluster.FleetctlWithInput("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: %v", err)
	}

	// Recreation of the cluster simulates a change in the server's host key
	cluster.DestroyMember("1")
	cluster.CreateMember("1", platform.MachineConfig{})
	machines, err = cluster.WaitForNMachines(1)
	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("--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 _, _, err := cluster.FleetctlWithInput("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: %v", err)
	}

}