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Allow override of cluster level (default, whitelist) tolerations by namespace level empty (default, whitelist) tolerations.

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This commit is contained in:
Avesh Agarwal 2017-10-30 16:27:08 -04:00
parent 0c1f25fc1b
commit 13289d2218
2 changed files with 51 additions and 13 deletions
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27
plugin/pkg/admission/podtolerationrestriction/admission.go
View File

@ -125,7 +125,7 @@ func (p *podTolerationsPlugin) Admit(a admission.Attributes) error {
// If the namespace has not specified its default tolerations,
// fall back to cluster's default tolerations.
if len(ts) == 0 {
if ts == nil {
ts = p.pluginConfig.Default
}
@ -157,7 +157,7 @@ func (p *podTolerationsPlugin) Admit(a admission.Attributes) error {
// If the namespace has not specified its tolerations whitelist,
// fall back to cluster's whitelist of tolerations.
if len(whitelist) == 0 {
if whitelist == nil {
whitelist = p.pluginConfig.Whitelist
}
@ -220,14 +220,33 @@ func (p *podTolerationsPlugin) getNamespaceTolerationsWhitelist(ns *api.Namespac
return extractNSTolerations(ns, NSWLTolerations)
}
// extractNSTolerations extracts default or whitelist of tolerations from
// following namespace annotations keys: "scheduler.alpha.kubernetes.io/defaultTolerations"
// and "scheduler.alpha.kubernetes.io/tolerationsWhitelist". If these keys are
// unset (nil), extractNSTolerations returns nil. If the value to these
// keys are set to empty, an empty toleration is returned, otherwise
// configured tolerations are returned.
func extractNSTolerations(ns *api.Namespace, key string) ([]api.Toleration, error) {
// if a namespace does not have any annotations
if len(ns.Annotations) == 0 {
return nil, nil
}
// if NSWLTolerations or NSDefaultTolerations does not exist
if _, ok := ns.Annotations[key]; !ok {
return nil, nil
}
// if value is set to empty
if len(ns.Annotations[key]) == 0 {
return []api.Toleration{}, nil
}
var v1Tolerations []v1.Toleration
if len(ns.Annotations) > 0 && ns.Annotations[key] != "" {
err := json.Unmarshal([]byte(ns.Annotations[key]), &v1Tolerations)
if err != nil {
return nil, err
}
}
ts := make([]api.Toleration, len(v1Tolerations))
for i := range v1Tolerations {

31
plugin/pkg/admission/podtolerationrestriction/admission_test.go
View File

@ -115,11 +115,11 @@ func TestPodAdmission(t *testing.T) {
{
pod: bestEffortPod,
defaultClusterTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue", Effect: "NoSchedule", TolerationSeconds: nil}},
namespaceTolerations: []api.Toleration{},
namespaceTolerations: nil,
podTolerations: []api.Toleration{},
mergedTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue", Effect: "NoSchedule", TolerationSeconds: nil}},
admit: true,
testName: "default cluster tolerations with empty pod tolerations",
testName: "default cluster tolerations with empty pod tolerations and nil namespace tolerations",
},
{
pod: bestEffortPod,
@ -161,8 +161,9 @@ func TestPodAdmission(t *testing.T) {
defaultClusterTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue2", Effect: "NoSchedule", TolerationSeconds: nil}},
namespaceTolerations: []api.Toleration{},
podTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue1", Effect: "NoSchedule", TolerationSeconds: nil}},
admit: false,
testName: "conflicting pod and default cluster tolerations",
mergedTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue1", Effect: "NoSchedule", TolerationSeconds: nil}},
admit: true,
testName: "conflicting pod and default cluster tolerations but overridden by empty namespace tolerations",
},
{
pod: bestEffortPod,
@ -174,6 +175,24 @@ func TestPodAdmission(t *testing.T) {
admit: true,
testName: "merged pod tolerations satisfy whitelist",
},
{
pod: bestEffortPod,
defaultClusterTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue", Effect: "NoSchedule", TolerationSeconds: nil}},
namespaceTolerations: []api.Toleration{},
podTolerations: []api.Toleration{},
mergedTolerations: []api.Toleration{},
admit: true,
testName: "Override default cluster toleration by empty namespace level toleration",
},
{
pod: bestEffortPod,
whitelist: []api.Toleration{},
clusterWhitelist: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue1", Effect: "NoSchedule", TolerationSeconds: nil}},
podTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue", Effect: "NoSchedule", TolerationSeconds: nil}},
mergedTolerations: []api.Toleration{{Key: "testKey", Operator: "Equal", Value: "testValue", Effect: "NoSchedule", TolerationSeconds: nil}},
admit: true,
testName: "pod toleration conflicts with default cluster white list which is overridden by empty namespace whitelist",
},
{
pod: bestEffortPod,
defaultClusterTolerations: []api.Toleration{},
@ -211,7 +230,7 @@ func TestPodAdmission(t *testing.T) {
},
}
for _, test := range tests {
if len(test.namespaceTolerations) > 0 {
if test.namespaceTolerations != nil {
tolerationStr, err := json.Marshal(test.namespaceTolerations)
if err != nil {
t.Errorf("error in marshalling namespace tolerations %v", test.namespaceTolerations)
@ -219,7 +238,7 @@ func TestPodAdmission(t *testing.T) {
namespace.Annotations = map[string]string{NSDefaultTolerations: string(tolerationStr)}
}
if len(test.whitelist) > 0 {
if test.whitelist != nil {
tolerationStr, err := json.Marshal(test.whitelist)
if err != nil {
t.Errorf("error in marshalling namespace whitelist %v", test.whitelist)