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✨ Add MachineSetReady condition to MachineDeployment #9262

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Feb 6, 2024
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✨ Add MachineSetReady condition to MachineDeployment #9262

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8 changes: 8 additions & 0 deletions api/v1beta1/condition_consts.go
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Original file line number Diff line number Diff line change
Expand Up @@ -228,6 +228,14 @@ const (
// machines required (i.e. Spec.Replicas-MaxUnavailable when MachineDeploymentStrategyType = RollingUpdate) are up and running for at least minReadySeconds.
MachineDeploymentAvailableCondition ConditionType = "Available"

// MachineSetReadyCondition reports a summary of current status of the MachineSet owned by the MachineDeployment.
MachineSetReadyCondition ConditionType = "MachineSetReady"
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should this be included in the MD conditions.SetSummary?

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If I am not mistaken, currently if the minReplicas is reached, the MachineDeployment will report Ready to be True, even if one of the machines is failing.
If we include this new condition in the summary, then the MachineDeployment will not be Ready if any machine fails.

Do we want that?

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I think you're right, let's keep the scope to the minimal and avoid changing existing semantic.


// WaitingForMachineSetFallbackReason (Severity=Info) documents a MachineDeployment waiting for the underlying MachineSet
// to be available.
// NOTE: This reason is used only as a fallback when the MachineSet object is not reporting its own ready condition.
WaitingForMachineSetFallbackReason = "WaitingForMachineSet"

// WaitingForAvailableMachinesReason (Severity=Warning) reflects the fact that the required minimum number of machines for a machinedeployment are not available.
WaitingForAvailableMachinesReason = "WaitingForAvailableMachines"
)
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11 changes: 11 additions & 0 deletions internal/controllers/machinedeployment/machinedeployment_sync.go
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Expand Up @@ -499,6 +499,17 @@ func (r *Reconciler) syncDeploymentStatus(allMSs []*clusterv1.MachineSet, newMS
} else {
conditions.MarkFalse(md, clusterv1.MachineDeploymentAvailableCondition, clusterv1.WaitingForAvailableMachinesReason, clusterv1.ConditionSeverityWarning, "Minimum availability requires %d replicas, current %d available", minReplicasNeeded, md.Status.AvailableReplicas)
}

if newMS != nil {
// Report a summary of current status of the MachineSet object owned by this MachineDeployment.
conditions.SetMirror(md, clusterv1.MachineSetReadyCondition,
newMS,
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conditions.WithFallbackValue(false, clusterv1.WaitingForMachineSetFallbackReason, clusterv1.ConditionSeverityInfo, ""),
)
} else {
conditions.MarkFalse(md, clusterv1.MachineSetReadyCondition, clusterv1.WaitingForMachineSetFallbackReason, clusterv1.ConditionSeverityInfo, "MachineSet not found")
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In what scenarios would newMS be nil?

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before I added this check, one of the e2e panicked with a nil dereference error.
If I am not wrong, that was the case when the MD was deleting.

}

return nil
}

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42 changes: 39 additions & 3 deletions internal/controllers/machinedeployment/machinedeployment_sync_test.go
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Expand Up @@ -430,7 +430,7 @@ func newTestMachineDeployment(pds *int32, replicas, statusReplicas, updatedRepli
}

// helper to create MS with given availableReplicas.
func newTestMachinesetWithReplicas(name string, specReplicas, statusReplicas, availableReplicas int32) *clusterv1.MachineSet {
func newTestMachinesetWithReplicas(name string, specReplicas, statusReplicas, availableReplicas int32, conditions clusterv1.Conditions) *clusterv1.MachineSet {
return &clusterv1.MachineSet{
ObjectMeta: metav1.ObjectMeta{
Name: name,
Expand All @@ -443,6 +443,7 @@ func newTestMachinesetWithReplicas(name string, specReplicas, statusReplicas, av
Status: clusterv1.MachineSetStatus{
AvailableReplicas: availableReplicas,
Replicas: statusReplicas,
Conditions: conditions,
},
}
}
Expand All @@ -460,7 +461,7 @@ func TestSyncDeploymentStatus(t *testing.T) {
name: "Deployment not available: MachineDeploymentAvailableCondition should exist and be false",
d: newTestMachineDeployment(&pds, 3, 2, 2, 2, clusterv1.Conditions{}),
oldMachineSets: []*clusterv1.MachineSet{},
newMachineSet: newTestMachinesetWithReplicas("foo", 3, 2, 2),
newMachineSet: newTestMachinesetWithReplicas("foo", 3, 2, 2, clusterv1.Conditions{}),
expectedConditions: []*clusterv1.Condition{
{
Type: clusterv1.MachineDeploymentAvailableCondition,
Expand All @@ -474,14 +475,49 @@ func TestSyncDeploymentStatus(t *testing.T) {
name: "Deployment Available: MachineDeploymentAvailableCondition should exist and be true",
d: newTestMachineDeployment(&pds, 3, 3, 3, 3, clusterv1.Conditions{}),
oldMachineSets: []*clusterv1.MachineSet{},
newMachineSet: newTestMachinesetWithReplicas("foo", 3, 3, 3),
newMachineSet: newTestMachinesetWithReplicas("foo", 3, 3, 3, clusterv1.Conditions{}),
expectedConditions: []*clusterv1.Condition{
{
Type: clusterv1.MachineDeploymentAvailableCondition,
Status: corev1.ConditionTrue,
},
},
},
{
name: "MachineSet exist: MachineSetReadyCondition should exist and mirror MachineSet Ready condition",
d: newTestMachineDeployment(&pds, 3, 3, 3, 3, clusterv1.Conditions{}),
oldMachineSets: []*clusterv1.MachineSet{},
newMachineSet: newTestMachinesetWithReplicas("foo", 3, 3, 3, clusterv1.Conditions{
{
Type: clusterv1.ReadyCondition,
Status: corev1.ConditionFalse,
Reason: "TestErrorResaon",
Message: "test error messsage",
},
}),
expectedConditions: []*clusterv1.Condition{
{
Type: clusterv1.MachineSetReadyCondition,
Status: corev1.ConditionFalse,
Reason: "TestErrorResaon",
Message: "test error messsage",
},
},
},
{
name: "MachineSet doesn't exist: MachineSetReadyCondition should exist and be false",
d: newTestMachineDeployment(&pds, 3, 3, 3, 3, clusterv1.Conditions{}),
oldMachineSets: []*clusterv1.MachineSet{},
newMachineSet: nil,
expectedConditions: []*clusterv1.Condition{
{
Type: clusterv1.MachineSetReadyCondition,
Status: corev1.ConditionFalse,
Severity: clusterv1.ConditionSeverityInfo,
Reason: clusterv1.WaitingForMachineSetFallbackReason,
},
},
},
}

for _, test := range tests {
Expand Down