/
warnings.go
359 lines (328 loc) · 16.6 KB
/
warnings.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
Copyright 2021 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package pod
import (
"context"
"fmt"
"strings"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation/field"
utilfeature "k8s.io/apiserver/pkg/util/feature"
nodeapi "k8s.io/kubernetes/pkg/api/node"
pvcutil "k8s.io/kubernetes/pkg/api/persistentvolumeclaim"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/apis/core/pods"
"k8s.io/kubernetes/pkg/features"
)
func GetWarningsForPod(ctx context.Context, pod, oldPod *api.Pod) []string {
if pod == nil {
return nil
}
var (
oldSpec *api.PodSpec
oldMeta *metav1.ObjectMeta
)
if oldPod != nil {
oldSpec = &oldPod.Spec
oldMeta = &oldPod.ObjectMeta
}
return warningsForPodSpecAndMeta(nil, &pod.Spec, &pod.ObjectMeta, oldSpec, oldMeta)
}
func GetWarningsForPodTemplate(ctx context.Context, fieldPath *field.Path, podTemplate, oldPodTemplate *api.PodTemplateSpec) []string {
if podTemplate == nil {
return nil
}
var (
oldSpec *api.PodSpec
oldMeta *metav1.ObjectMeta
)
if oldPodTemplate != nil {
oldSpec = &oldPodTemplate.Spec
oldMeta = &oldPodTemplate.ObjectMeta
}
return warningsForPodSpecAndMeta(fieldPath, &podTemplate.Spec, &podTemplate.ObjectMeta, oldSpec, oldMeta)
}
var deprecatedAnnotations = []struct {
key string
prefix string
message string
}{
{
key: `scheduler.alpha.kubernetes.io/critical-pod`,
message: `non-functional in v1.16+; use the "priorityClassName" field instead`,
},
{
key: `security.alpha.kubernetes.io/sysctls`,
message: `non-functional in v1.11+; use the "sysctls" field instead`,
},
{
key: `security.alpha.kubernetes.io/unsafe-sysctls`,
message: `non-functional in v1.11+; use the "sysctls" field instead`,
},
}
func warningsForPodSpecAndMeta(fieldPath *field.Path, podSpec *api.PodSpec, meta *metav1.ObjectMeta, oldPodSpec *api.PodSpec, oldMeta *metav1.ObjectMeta) []string {
var warnings []string
// use of deprecated node labels in selectors/affinity/topology
for k := range podSpec.NodeSelector {
if msg, deprecated := nodeapi.GetNodeLabelDeprecatedMessage(k); deprecated {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("spec", "nodeSelector").Key(k), msg))
}
}
if podSpec.Affinity != nil && podSpec.Affinity.NodeAffinity != nil {
n := podSpec.Affinity.NodeAffinity
if n.RequiredDuringSchedulingIgnoredDuringExecution != nil {
termFldPath := fieldPath.Child("spec", "affinity", "nodeAffinity", "requiredDuringSchedulingIgnoredDuringExecution", "nodeSelectorTerms")
for i, term := range n.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms {
warnings = append(warnings, nodeapi.GetWarningsForNodeSelectorTerm(term, termFldPath.Index(i))...)
}
}
preferredFldPath := fieldPath.Child("spec", "affinity", "nodeAffinity", "preferredDuringSchedulingIgnoredDuringExecution")
for i, term := range n.PreferredDuringSchedulingIgnoredDuringExecution {
warnings = append(warnings, nodeapi.GetWarningsForNodeSelectorTerm(term.Preference, preferredFldPath.Index(i).Child("preference"))...)
}
}
for i, t := range podSpec.TopologySpreadConstraints {
if msg, deprecated := nodeapi.GetNodeLabelDeprecatedMessage(t.TopologyKey); deprecated {
warnings = append(warnings, fmt.Sprintf(
"%s: %s is %s",
fieldPath.Child("spec", "topologySpreadConstraints").Index(i).Child("topologyKey"),
t.TopologyKey,
msg,
))
}
// warn if labelSelector is empty which is no-match.
if t.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Child("spec", "topologySpreadConstraints").Index(i).Child("labelSelector")))
}
}
// use of deprecated annotations
for _, deprecated := range deprecatedAnnotations {
if _, exists := meta.Annotations[deprecated.key]; exists {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("metadata", "annotations").Key(deprecated.key), deprecated.message))
}
if len(deprecated.prefix) > 0 {
for k := range meta.Annotations {
if strings.HasPrefix(k, deprecated.prefix) {
warnings = append(warnings, fmt.Sprintf("%s: %s", fieldPath.Child("metadata", "annotations").Key(k), deprecated.message))
break
}
}
}
}
// deprecated and removed volume plugins
for i, v := range podSpec.Volumes {
if v.PhotonPersistentDisk != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.11, non-functional in v1.16+", fieldPath.Child("spec", "volumes").Index(i).Child("photonPersistentDisk")))
}
if v.GitRepo != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.11", fieldPath.Child("spec", "volumes").Index(i).Child("gitRepo")))
}
if v.ScaleIO != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.16, non-functional in v1.22+", fieldPath.Child("spec", "volumes").Index(i).Child("scaleIO")))
}
if v.Flocker != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("flocker")))
}
if v.StorageOS != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("storageOS")))
}
if v.Quobyte != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.22, non-functional in v1.25+", fieldPath.Child("spec", "volumes").Index(i).Child("quobyte")))
}
if v.Glusterfs != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.25, non-functional in v1.26+", fieldPath.Child("spec", "volumes").Index(i).Child("glusterfs")))
}
if v.Ephemeral != nil && v.Ephemeral.VolumeClaimTemplate != nil {
warnings = append(warnings, pvcutil.GetWarningsForPersistentVolumeClaimSpec(fieldPath.Child("spec", "volumes").Index(i).Child("ephemeral").Child("volumeClaimTemplate").Child("spec"), v.Ephemeral.VolumeClaimTemplate.Spec)...)
}
if v.CephFS != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.28, non-functional in v1.31+", fieldPath.Child("spec", "volumes").Index(i).Child("cephfs")))
}
if v.RBD != nil {
warnings = append(warnings, fmt.Sprintf("%s: deprecated in v1.28, non-functional in v1.31+", fieldPath.Child("spec", "volumes").Index(i).Child("rbd")))
}
}
// duplicate hostAliases (#91670, #58477)
if len(podSpec.HostAliases) > 1 {
items := sets.New[string]()
for i, item := range podSpec.HostAliases {
if items.Has(item.IP) {
warnings = append(warnings, fmt.Sprintf("%s: duplicate ip %q", fieldPath.Child("spec", "hostAliases").Index(i).Child("ip"), item.IP))
} else {
items.Insert(item.IP)
}
}
}
// duplicate imagePullSecrets (#91629, #58477)
if len(podSpec.ImagePullSecrets) > 1 {
items := sets.New[string]()
for i, item := range podSpec.ImagePullSecrets {
if items.Has(item.Name) {
warnings = append(warnings, fmt.Sprintf("%s: duplicate name %q", fieldPath.Child("spec", "imagePullSecrets").Index(i).Child("name"), item.Name))
} else {
items.Insert(item.Name)
}
}
}
// imagePullSecrets with empty name (#99454#issuecomment-787838112)
for i, item := range podSpec.ImagePullSecrets {
if len(item.Name) == 0 {
warnings = append(warnings, fmt.Sprintf("%s: invalid empty name %q", fieldPath.Child("spec", "imagePullSecrets").Index(i).Child("name"), item.Name))
}
}
// fractional memory/ephemeral-storage requests/limits (#79950, #49442, #18538)
if value, ok := podSpec.Overhead[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", fieldPath.Child("spec", "overhead").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := podSpec.Overhead[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", fieldPath.Child("spec", "overhead").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
// use of pod seccomp annotation without accompanying field
if podSpec.SecurityContext == nil || podSpec.SecurityContext.SeccompProfile == nil {
if _, exists := meta.Annotations[api.SeccompPodAnnotationKey]; exists {
warnings = append(warnings, fmt.Sprintf(`%s: non-functional in v1.27+; use the "seccompProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(api.SeccompPodAnnotationKey)))
}
}
hasPodAppArmorProfile := podSpec.SecurityContext != nil && podSpec.SecurityContext.AppArmorProfile != nil
pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, p *field.Path) bool {
// use of container seccomp annotation without accompanying field
if c.SecurityContext == nil || c.SecurityContext.SeccompProfile == nil {
if _, exists := meta.Annotations[api.SeccompContainerAnnotationKeyPrefix+c.Name]; exists {
warnings = append(warnings, fmt.Sprintf(`%s: non-functional in v1.27+; use the "seccompProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(api.SeccompContainerAnnotationKeyPrefix+c.Name)))
}
}
// use of container AppArmor annotation without accompanying field
if utilfeature.DefaultFeatureGate.Enabled(features.AppArmorFields) {
isPodTemplate := fieldPath != nil // Pod warnings are emitted through applyAppArmorVersionSkew instead.
hasAppArmorField := hasPodAppArmorProfile || (c.SecurityContext != nil && c.SecurityContext.AppArmorProfile != nil)
if isPodTemplate && !hasAppArmorField {
key := api.DeprecatedAppArmorAnnotationKeyPrefix + c.Name
if _, exists := meta.Annotations[key]; exists {
warnings = append(warnings, fmt.Sprintf(`%s: deprecated since v1.30; use the "appArmorProfile" field instead`, fieldPath.Child("metadata", "annotations").Key(key)))
}
}
}
// fractional memory/ephemeral-storage requests/limits (#79950, #49442, #18538)
if value, ok := c.Resources.Limits[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "limits").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := c.Resources.Requests[api.ResourceMemory]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "requests").Key(string(api.ResourceMemory)), value.String()))
}
if value, ok := c.Resources.Limits[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "limits").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
if value, ok := c.Resources.Requests[api.ResourceEphemeralStorage]; ok && value.MilliValue()%int64(1000) != int64(0) {
warnings = append(warnings, fmt.Sprintf("%s: fractional byte value %q is invalid, must be an integer", p.Child("resources", "requests").Key(string(api.ResourceEphemeralStorage)), value.String()))
}
// duplicate containers[*].env (#86163, #93266, #58477)
if len(c.Env) > 1 {
items := sets.New[string]()
for i, item := range c.Env {
if items.Has(item.Name) {
// a previous value exists, but it might be OK
bad := false
ref := fmt.Sprintf("$(%s)", item.Name) // what does a ref to this name look like
// if we are replacing it with a valueFrom, warn
if item.ValueFrom != nil {
bad = true
}
// if this is X="$(X)", warn
if item.Value == ref {
bad = true
}
// if the new value does not contain a reference to the old
// value (e.g. X="abc"; X="$(X)123"), warn
if !strings.Contains(item.Value, ref) {
bad = true
}
if bad {
warnings = append(warnings, fmt.Sprintf("%s: hides previous definition of %q, which may be dropped when using apply", p.Child("env").Index(i), item.Name))
}
} else {
items.Insert(item.Name)
}
}
}
return true
})
type portBlock struct {
field *field.Path
port api.ContainerPort
}
// Accumulate ports across all containers
allPorts := map[string][]portBlock{}
pods.VisitContainersWithPath(podSpec, fieldPath.Child("spec"), func(c *api.Container, fldPath *field.Path) bool {
for i, port := range c.Ports {
if port.HostIP != "" && port.HostPort == 0 {
warnings = append(warnings, fmt.Sprintf("%s: hostIP set without hostPort: %+v",
fldPath.Child("ports").Index(i), port))
}
k := fmt.Sprintf("%d/%s", port.ContainerPort, port.Protocol)
if others, found := allPorts[k]; found {
// Someone else has this protcol+port, but it still might not be a conflict.
for _, other := range others {
if port.HostIP == other.port.HostIP && port.HostPort == other.port.HostPort {
// Exactly-equal is obvious. Validation should already filter for this except when these are unspecified.
warnings = append(warnings, fmt.Sprintf("%s: duplicate port definition with %s", fldPath.Child("ports").Index(i), other.field))
} else if port.HostPort == 0 || other.port.HostPort == 0 {
// HostPort = 0 is redundant with any other value, which is odd but not really dangerous. HostIP doesn't matter here.
warnings = append(warnings, fmt.Sprintf("%s: overlapping port definition with %s", fldPath.Child("ports").Index(i), other.field))
} else if a, b := port.HostIP == "", other.port.HostIP == ""; port.HostPort == other.port.HostPort && ((a || b) && !(a && b)) {
// If the HostPorts are the same and either HostIP is not specified while the other is not, the behavior is undefined.
warnings = append(warnings, fmt.Sprintf("%s: dangerously ambiguous port definition with %s", fldPath.Child("ports").Index(i), other.field))
}
}
allPorts[k] = append(allPorts[k], portBlock{field: fldPath.Child("ports").Index(i), port: port})
} else {
allPorts[k] = []portBlock{{field: fldPath.Child("ports").Index(i), port: port}}
}
}
return true
})
// warn if the terminationGracePeriodSeconds is negative.
if podSpec.TerminationGracePeriodSeconds != nil && *podSpec.TerminationGracePeriodSeconds < 0 {
warnings = append(warnings, fmt.Sprintf("%s: must be >= 0; negative values are invalid and will be treated as 1", fieldPath.Child("spec", "terminationGracePeriodSeconds")))
}
if podSpec.Affinity != nil {
if affinity := podSpec.Affinity.PodAffinity; affinity != nil {
warnings = append(warnings, warningsForPodAffinityTerms(affinity.RequiredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAffinity", "requiredDuringSchedulingIgnoredDuringExecution"))...)
warnings = append(warnings, warningsForWeightedPodAffinityTerms(affinity.PreferredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAffinity", "preferredDuringSchedulingIgnoredDuringExecution"))...)
}
if affinity := podSpec.Affinity.PodAntiAffinity; affinity != nil {
warnings = append(warnings, warningsForPodAffinityTerms(affinity.RequiredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAntiAffinity", "requiredDuringSchedulingIgnoredDuringExecution"))...)
warnings = append(warnings, warningsForWeightedPodAffinityTerms(affinity.PreferredDuringSchedulingIgnoredDuringExecution, fieldPath.Child("spec", "affinity", "podAntiAffinity", "preferredDuringSchedulingIgnoredDuringExecution"))...)
}
}
return warnings
}
func warningsForPodAffinityTerms(terms []api.PodAffinityTerm, fieldPath *field.Path) []string {
var warnings []string
for i, t := range terms {
if t.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Index(i).Child("labelSelector")))
}
}
return warnings
}
func warningsForWeightedPodAffinityTerms(terms []api.WeightedPodAffinityTerm, fieldPath *field.Path) []string {
var warnings []string
for i, t := range terms {
// warn if labelSelector is empty which is no-match.
if t.PodAffinityTerm.LabelSelector == nil {
warnings = append(warnings, fmt.Sprintf("%s: a null labelSelector results in matching no pod", fieldPath.Index(i).Child("podAffinityTerm", "labelSelector")))
}
}
return warnings
}