forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
scale.go
153 lines (129 loc) · 5.47 KB
/
scale.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
/*
Copyright 2014 The Kubernetes Authors All rights reserved.
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"
"os"
"github.com/spf13/cobra"
"k8s.io/kubernetes/pkg/kubectl"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/util/errors"
)
// ScaleOptions is the start of the data required to perform the operation. As new fields are added, add them here instead of
// referencing the cmd.Flags()
type ScaleOptions struct {
Filenames []string
}
const (
scale_long = `Set a new size for a Replication Controller.
Scale also allows users to specify one or more preconditions for the scale action.
If --current-replicas or --resource-version is specified, it is validated before the
scale is attempted, and it is guaranteed that the precondition holds true when the
scale is sent to the server.`
scale_example = `# Scale replication controller named 'foo' to 3.
$ kubectl scale --replicas=3 replicationcontrollers foo
# Scale a replication controller identified by type and name specified in "foo-controller.yaml" to 3.
$ kubectl scale --replicas=3 -f foo-controller.yaml
# If the replication controller named foo's current size is 2, scale foo to 3.
$ kubectl scale --current-replicas=2 --replicas=3 replicationcontrollers foo
# Scale multiple replication controllers.
$ kubectl scale --replicas=5 rc/foo rc/bar`
)
// NewCmdScale returns a cobra command with the appropriate configuration and flags to run scale
func NewCmdScale(f *cmdutil.Factory, out io.Writer) *cobra.Command {
options := &ScaleOptions{}
cmd := &cobra.Command{
Use: "scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT (-f FILENAME | TYPE NAME)",
// resize is deprecated
Aliases: []string{"resize"},
Short: "Set a new size for a Replication Controller.",
Long: scale_long,
Example: scale_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(cmdutil.ValidateOutputArgs(cmd))
shortOutput := cmdutil.GetFlagString(cmd, "output") == "name"
err := RunScale(f, out, cmd, args, shortOutput, options)
cmdutil.CheckErr(err)
},
}
cmd.Flags().String("resource-version", "", "Precondition for resource version. Requires that the current resource version match this value in order to scale.")
cmd.Flags().Int("current-replicas", -1, "Precondition for current size. Requires that the current size of the replication controller match this value in order to scale.")
cmd.Flags().Int("replicas", -1, "The new desired number of replicas. Required.")
cmd.MarkFlagRequired("replicas")
cmd.Flags().Duration("timeout", 0, "The length of time to wait before giving up on a scale operation, zero means don't wait.")
cmdutil.AddOutputFlagsForMutation(cmd)
usage := "Filename, directory, or URL to a file identifying the replication controller to set a new size"
kubectl.AddJsonFilenameFlag(cmd, &options.Filenames, usage)
return cmd
}
// RunScale executes the scaling
func RunScale(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, shortOutput bool, options *ScaleOptions) error {
if len(os.Args) > 1 && os.Args[1] == "resize" {
printDeprecationWarning("scale", "resize")
}
count := cmdutil.GetFlagInt(cmd, "replicas")
if count < 0 {
return cmdutil.UsageError(cmd, "--replicas=COUNT is required, and COUNT must be greater than or equal to 0")
}
cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
if err != nil {
return err
}
mapper, typer := f.Object()
r := resource.NewBuilder(mapper, typer, f.ClientMapperForCommand()).
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, options.Filenames...).
ResourceTypeOrNameArgs(false, args...).
Flatten().
Do()
err = r.Err()
if err != nil {
return err
}
infos, err := r.Infos()
if err != nil {
return err
}
info := infos[0]
mapping := info.ResourceMapping()
scaler, err := f.Scaler(mapping)
if err != nil {
return err
}
resourceVersion := cmdutil.GetFlagString(cmd, "resource-version")
if len(resourceVersion) != 0 && len(infos) > 1 {
return fmt.Errorf("cannot use --resource-version with multiple controllers")
}
currentSize := cmdutil.GetFlagInt(cmd, "current-replicas")
if currentSize != -1 && len(infos) > 1 {
return fmt.Errorf("cannot use --current-replicas with multiple controllers")
}
precondition := &kubectl.ScalePrecondition{Size: currentSize, ResourceVersion: resourceVersion}
retry := kubectl.NewRetryParams(kubectl.Interval, kubectl.Timeout)
var waitForReplicas *kubectl.RetryParams
if timeout := cmdutil.GetFlagDuration(cmd, "timeout"); timeout != 0 {
waitForReplicas = kubectl.NewRetryParams(kubectl.Interval, timeout)
}
errs := []error{}
for _, info := range infos {
if err := scaler.Scale(info.Namespace, info.Name, uint(count), precondition, retry, waitForReplicas); err != nil {
errs = append(errs, err)
continue
}
cmdutil.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, "scaled")
}
return errors.NewAggregate(errs)
}