forked from k3s-io/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
taint.go
305 lines (272 loc) · 10.1 KB
/
taint.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
/*
Copyright 2016 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 cmd
import (
"fmt"
"io"
"strings"
"encoding/json"
"github.com/golang/glog"
"github.com/spf13/cobra"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
taintutils "k8s.io/kubernetes/pkg/util/taints"
)
// TaintOptions have the data required to perform the taint operation
type TaintOptions struct {
resources []string
taintsToAdd []v1.Taint
taintsToRemove []v1.Taint
builder *resource.Builder
selector string
overwrite bool
all bool
f cmdutil.Factory
out io.Writer
cmd *cobra.Command
}
var (
taintLong = templates.LongDesc(i18n.T(`
Update the taints on one or more nodes.
* A taint consists of a key, value, and effect. As an argument here, it is expressed as key=value:effect.
* The key must begin with a letter or number, and may contain letters, numbers, hyphens, dots, and underscores, up to %[1]d characters.
* Optionally, the key can begin with a DNS subdomain prefix and a single '/', like example.com/my-app
* The value must begin with a letter or number, and may contain letters, numbers, hyphens, dots, and underscores, up to %[2]d characters.
* The effect must be NoSchedule, PreferNoSchedule or NoExecute.
* Currently taint can only apply to node.`))
taintExample = templates.Examples(i18n.T(`
# Update node 'foo' with a taint with key 'dedicated' and value 'special-user' and effect 'NoSchedule'.
# If a taint with that key and effect already exists, its value is replaced as specified.
kubectl taint nodes foo dedicated=special-user:NoSchedule
# Remove from node 'foo' the taint with key 'dedicated' and effect 'NoSchedule' if one exists.
kubectl taint nodes foo dedicated:NoSchedule-
# Remove from node 'foo' all the taints with key 'dedicated'
kubectl taint nodes foo dedicated-
# Add a taint with key 'dedicated' on nodes having label mylabel=X
kubectl taint node -l myLabel=X dedicated=foo:PreferNoSchedule`))
)
func NewCmdTaint(f cmdutil.Factory, out io.Writer) *cobra.Command {
options := &TaintOptions{}
validArgs := []string{"node"}
argAliases := kubectl.ResourceAliases(validArgs)
cmd := &cobra.Command{
Use: "taint NODE NAME KEY_1=VAL_1:TAINT_EFFECT_1 ... KEY_N=VAL_N:TAINT_EFFECT_N",
DisableFlagsInUseLine: true,
Short: i18n.T("Update the taints on one or more nodes"),
Long: fmt.Sprintf(taintLong, validation.DNS1123SubdomainMaxLength, validation.LabelValueMaxLength),
Example: taintExample,
Run: func(cmd *cobra.Command, args []string) {
if err := options.Complete(f, out, cmd, args); err != nil {
cmdutil.CheckErr(err)
}
if err := options.Validate(); err != nil {
cmdutil.CheckErr(cmdutil.UsageErrorf(cmd, err.Error()))
}
if err := options.RunTaint(); err != nil {
cmdutil.CheckErr(err)
}
},
ValidArgs: validArgs,
ArgAliases: argAliases,
}
cmdutil.AddValidateFlags(cmd)
cmdutil.AddPrinterFlags(cmd)
cmdutil.AddInclude3rdPartyFlags(cmd)
cmd.Flags().StringVarP(&options.selector, "selector", "l", "", "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
cmd.Flags().BoolVar(&options.overwrite, "overwrite", false, "If true, allow taints to be overwritten, otherwise reject taint updates that overwrite existing taints.")
cmd.Flags().BoolVar(&options.all, "all", false, "Select all nodes in the cluster")
return cmd
}
// Complete adapts from the command line args and factory to the data required.
func (o *TaintOptions) Complete(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string) (err error) {
namespace, _, err := f.DefaultNamespace()
if err != nil {
return err
}
// retrieves resource and taint args from args
// also checks args to verify that all resources are specified before taints
taintArgs := []string{}
metTaintArg := false
for _, s := range args {
isTaint := strings.Contains(s, "=") || strings.HasSuffix(s, "-")
switch {
case !metTaintArg && isTaint:
metTaintArg = true
fallthrough
case metTaintArg && isTaint:
taintArgs = append(taintArgs, s)
case !metTaintArg && !isTaint:
o.resources = append(o.resources, s)
case metTaintArg && !isTaint:
return fmt.Errorf("all resources must be specified before taint changes: %s", s)
}
}
if len(o.resources) < 1 {
return fmt.Errorf("one or more resources must be specified as <resource> <name>")
}
if len(taintArgs) < 1 {
return fmt.Errorf("at least one taint update is required")
}
if o.taintsToAdd, o.taintsToRemove, err = taintutils.ParseTaints(taintArgs); err != nil {
return cmdutil.UsageErrorf(cmd, err.Error())
}
o.builder = f.NewBuilder().
Internal().
ContinueOnError().
NamespaceParam(namespace).DefaultNamespace()
if o.selector != "" {
o.builder = o.builder.LabelSelectorParam(o.selector).ResourceTypes("node")
}
if o.all {
o.builder = o.builder.SelectAllParam(o.all).ResourceTypes("node").Flatten().Latest()
}
if !o.all && o.selector == "" && len(o.resources) >= 2 {
o.builder = o.builder.ResourceNames("node", o.resources[1:]...)
}
o.builder = o.builder.LabelSelectorParam(o.selector).
Flatten().
Latest()
o.f = f
o.out = out
o.cmd = cmd
return nil
}
// validateFlags checks for the validation of flags for kubectl taints.
func (o TaintOptions) validateFlags() error {
// Cannot have a non-empty selector and all flag set. They are mutually exclusive.
if o.all && o.selector != "" {
return fmt.Errorf("setting 'all' parameter with a non empty selector is prohibited.")
}
// If both selector and all are not set.
if !o.all && o.selector == "" {
if len(o.resources) < 2 {
return fmt.Errorf("at least one resource name must be specified since 'all' parameter is not set")
} else {
return nil
}
}
return nil
}
// Validate checks to the TaintOptions to see if there is sufficient information run the command.
func (o TaintOptions) Validate() error {
resourceType := strings.ToLower(o.resources[0])
validResources, isValidResource := append(kubectl.ResourceAliases([]string{"node"}), "node"), false
for _, validResource := range validResources {
if resourceType == validResource {
isValidResource = true
break
}
}
if !isValidResource {
return fmt.Errorf("invalid resource type %s, only %q are supported", o.resources[0], validResources)
}
// check the format of taint args and checks removed taints aren't in the new taints list
var conflictTaints []string
for _, taintAdd := range o.taintsToAdd {
for _, taintRemove := range o.taintsToRemove {
if taintAdd.Key != taintRemove.Key {
continue
}
if len(taintRemove.Effect) == 0 || taintAdd.Effect == taintRemove.Effect {
conflictTaint := fmt.Sprintf("{\"%s\":\"%s\"}", taintRemove.Key, taintRemove.Effect)
conflictTaints = append(conflictTaints, conflictTaint)
}
}
}
if len(conflictTaints) > 0 {
return fmt.Errorf("can not both modify and remove the following taint(s) in the same command: %s", strings.Join(conflictTaints, ", "))
}
return o.validateFlags()
}
// RunTaint does the work
func (o TaintOptions) RunTaint() error {
r := o.builder.Do()
if err := r.Err(); err != nil {
return err
}
return r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
obj, err := info.Mapping.ConvertToVersion(info.Object, info.Mapping.GroupVersionKind.GroupVersion())
if err != nil {
return err
}
name, namespace := info.Name, info.Namespace
oldData, err := json.Marshal(obj)
if err != nil {
return err
}
operation, err := o.updateTaints(obj)
if err != nil {
return err
}
newData, err := json.Marshal(obj)
if err != nil {
return err
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, obj)
createdPatch := err == nil
if err != nil {
glog.V(2).Infof("couldn't compute patch: %v", err)
}
mapping := info.ResourceMapping()
client, err := o.f.ClientForMapping(mapping)
if err != nil {
return err
}
helper := resource.NewHelper(client, mapping)
var outputObj runtime.Object
if createdPatch {
outputObj, err = helper.Patch(namespace, name, types.StrategicMergePatchType, patchBytes)
} else {
outputObj, err = helper.Replace(namespace, name, false, obj)
}
if err != nil {
return err
}
mapper, _ := o.f.Object()
outputFormat := cmdutil.GetFlagString(o.cmd, "output")
if outputFormat != "" {
return o.f.PrintObject(o.cmd, false, mapper, outputObj, o.out)
}
o.f.PrintSuccess(mapper, false, o.out, info.Mapping.Resource, info.Name, false, operation)
return nil
})
}
// updateTaints applies a taint option(o) to a node in cluster after computing the net effect of operation(i.e. does it result in an overwrite?), it reports back the end result in a way that user can easily interpret.
func (o TaintOptions) updateTaints(obj runtime.Object) (string, error) {
node, ok := obj.(*v1.Node)
if !ok {
return "", fmt.Errorf("unexpected type %T, expected Node", obj)
}
if !o.overwrite {
if exists := taintutils.CheckIfTaintsAlreadyExists(node.Spec.Taints, o.taintsToAdd); len(exists) != 0 {
return "", fmt.Errorf("Node %s already has %v taint(s) with same effect(s) and --overwrite is false", node.Name, exists)
}
}
operation, newTaints, err := taintutils.ReorganizeTaints(node, o.overwrite, o.taintsToAdd, o.taintsToRemove)
if err != nil {
return "", err
}
node.Spec.Taints = newTaints
return operation, nil
}