kubectl autoscale
使用 autoscaler 自动设置在kubernetes集群中运行的pod数量（水平自动伸缩）。
指定Deployment、ReplicaSet或ReplicationController，并创建已经定义好资源的自动伸缩器。使用自动伸缩器可以根据需要自动增加或减少系统中部署的pod数量。
语法
$ autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu-percent=CPU] [flags]
示例
使用 Deployment “foo”设定，使用默认的自动伸缩策略，指定目标CPU使用率，使其Pod数量在2到10之间。
kubectl autoscale deployment foo --min=2 --max=10
使用RC“foo”设定，使其Pod的数量介于1和5之间，CPU使用率维持在80％。
kubectl autoscale rc foo --max=5 --cpu-percent=80
Flags
| Name | Shorthand | Default | Usage |
|---|---|---|---|
| allow-missing-template-keys | true | If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats. | |
| cpu-percent | -1 | The target average CPU utilization (represented as a percent of requested CPU) over all the pods. If it's not specified or negative, a default autoscaling policy will be used. | |
| dry-run | false | If true, only print the object that would be sent, without sending it. | |
| filename | f | [] | Filename, directory, or URL to files identifying the resource to autoscale. |
| generator | horizontalpodautoscaler/v1 | The name of the API generator to use. Currently there is only 1 generator. | |
| include-extended-apis | true | If true, include definitions of new APIs via calls to the API server. [default true] | |
| max | -1 | The upper limit for the number of pods that can be set by the autoscaler. Required. | |
| min | -1 | The lower limit for the number of pods that can be set by the autoscaler. If it's not specified or negative, the server will apply a default value. | |
| name | The name for the newly created object. If not specified, the name of the input resource will be used. | ||
| no-headers | false | When using the default or custom-column output format, don't print headers (default print headers). | |
| output | o | Output format. One of: json|yaml|wide|name|custom-columns=...|custom-columns-file=...|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=... See custom columns [http://kubernetes.io/docs/user-guide/kubectl-overview/#custom-columns], golang template [http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template [http://kubernetes.io/docs/user-guide/jsonpath]. | |
| output-version | DEPRECATED: To use a specific API version, fully-qualify the resource, version, and group (for example: 'jobs.v1.batch/myjob'). | ||
| record | false | Record current kubectl command in the resource annotation. If set to false, do not record the command. If set to true, record the command. If not set, default to updating the existing annotation value only if one already exists. | |
| recursive | R | false | Process the directory used in -f, --filename recursively. Useful when you want to manage related manifests organized within the same directory. |
| save-config | false | If true, the configuration of current object will be saved in its annotation. Otherwise, the annotation will be unchanged. This flag is useful when you want to perform kubectl apply on this object in the future. | |
| show-all | a | false | When printing, show all resources (default hide terminated pods.) |
| show-labels | false | When printing, show all labels as the last column (default hide labels column) | |
| sort-by | If non-empty, sort list types using this field specification. The field specification is expressed as a JSONPath expression (e.g. '{.metadata.name}'). The field in the API resource specified by this JSONPath expression must be an integer or a string. | ||
| template | Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is golang templates [http://golang.org/pkg/text/template/#pkg-overview]. |