k8s kubectl expose命令使用详解

冷不防 2023-10-04 10:43 21阅读 0赞

### k8s kubectl expose命令使用详解 ###

Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service

#### 摘要 ####

Expose a resource as a new Kubernetes service.

Looks up a deployment, service, replica set, replication controller or pod by name and uses the selector for that resource as the selector for a new service on the specified port. A deployment or replica set will be exposed as a service only if its selector is convertible to a selector that service supports, i.e. when the selector contains only the matchLabels component. Note that if no port is specified via –port and the exposed resource has multiple ports, all will be re-used by the new service. Also if no labels are specified, the new service will re-use the labels from the resource it exposes.

Possible resources include (case insensitive): pod (po), service (svc), replicationcontroller (rc), deployment, replicaset (rs)

kubectl expose (-f FILENAME | TYPE NAME) [--port=port] [--protocol=TCP|UDP] [--target-port=number-or-name] [--name=name] [--external-ip=external-ip-of-service] [--type=type]

#### 示例 ####

# Create a service for a replicated nginx, which serves on port 80 and connects to the containers on port 8000.
    kubectl expose rc nginx --port=80 --target-port=8000
    
    # Create a service for a replication controller identified by type and name specified in "nginx-controller.yaml", which serves on port 80 and connects to the containers on port 8000.
    kubectl expose -f nginx-controller.yaml --port=80 --target-port=8000
    
    # Create a service for a pod valid-pod, which serves on port 444 with the name "frontend"
    kubectl expose pod valid-pod --port=444 --name=frontend
    
    # Create a second service based on the above service, exposing the container port 8443 as port 443 with the name "nginx-https"
    kubectl expose service nginx --port=443 --target-port=8443 --name=nginx-https
    
    # Create a service for a replicated streaming application on port 4100 balancing UDP traffic and named 'video-stream'.
    kubectl expose rc streamer --port=4100 --protocol=udp --name=video-stream
    
    # Create a service for a replicated nginx using replica set, which serves on port 80 and connects to the containers on port 8000.
    kubectl expose rs nginx --port=80 --target-port=8000
    
    # Create a service for an nginx deployment, which serves on port 80 and connects to the containers on port 8000.
    kubectl expose deployment nginx --port=80 --target-port=8000

#### 选项 ####

--dry-run[=false]: If true, only print the object that would be sent, without sending it.
          --external-ip="": Additional external IP address (not managed by Kubernetes) to accept for the service. If this IP is routed to a node, the service can be accessed by this IP in addition to its generated service IP.
      -f, --filename=[]: Filename, directory, or URL to a file identifying the resource to expose a service
          --generator="service/v2": The name of the API generator to use. There are 2 generators: 'service/v1' and 'service/v2'. The only difference between them is that service port in v1 is named 'default', while it is left unnamed in v2. Default is 'service/v2'.
      -l, --labels="": Labels to apply to the service created by this call.
          --load-balancer-ip="": IP to assign to to the Load Balancer. If empty, an ephemeral IP will be created and used (cloud-provider specific).
          --name="": The name for the newly created object.
          --no-headers[=false]: 当使用默认输出格式时不打印标题栏。
      -o, --output="": Output format. One of: json|yaml|wide|name|go-template=...|go-template-file=...|jsonpath=...|jsonpath-file=... See golang template [http://golang.org/pkg/text/template/#pkg-overview] and jsonpath template [http://releases.k8s.io/release-1.3/docs/user-guide/jsonpath.md].
          --output-version="": Output the formatted object with the given group version (for ex: 'extensions/v1beta1').
          --overrides="": An inline JSON override for the generated object. If this is non-empty, it is used to override the generated object. Requires that the object supply a valid apiVersion field.
          --port="": The port that the service should serve on. Copied from the resource being exposed, if unspecified
          --protocol="": The network protocol for the service to be created. Default is 'TCP'.
          --record[=false]: Record current kubectl command in the resource annotation.
      -R, --recursive[=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. This is useful when you want to perform kubectl apply on this object in the future.
          --selector="": A label selector to use for this service. Only equality-based selector requirements are supported. If empty (the default) infer the selector from the replication controller or replica set.
          --session-affinity="": If non-empty, set the session affinity for the service to this; legal values: 'None', 'ClientIP'
      -a, --show-all[=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.
          --target-port="": Name or number for the port on the container that the service should direct traffic to. Optional.
          --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].
          --type="": Type for this service: ClusterIP, NodePort, or LoadBalancer. Default is 'ClusterIP'.

#### 继承自父命令的选项 ####

--alsologtostderr[=false]: 同时输出日志到标准错误控制台和文件。
          --certificate-authority="": 用以进行认证授权的.cert文件路径。
          --client-certificate="": TLS使用的客户端证书路径。
          --client-key="": TLS使用的客户端密钥路径。
          --cluster="": 指定使用的kubeconfig配置文件中的集群名。
          --context="": 指定使用的kubeconfig配置文件中的环境名。
          --insecure-skip-tls-verify[=false]: 如果为true，将不会检查服务器凭证的有效性，这会导致你的HTTPS链接变得不安全。
          --kubeconfig="": 命令行请求使用的配置文件路径。
          --log-backtrace-at=:0: 当日志长度超过定义的行数时，忽略堆栈信息。
          --log-dir="": 如果不为空，将日志文件写入此目录。
          --log-flush-frequency=5s: 刷新日志的最大时间间隔。
          --logtostderr[=true]: 输出日志到标准错误控制台，不输出到文件。
          --match-server-version[=false]: 要求服务端和客户端版本匹配。
          --namespace="": 如果不为空，命令将使用此namespace。
          --password="": API Server进行简单认证使用的密码。
      -s, --server="": Kubernetes API Server的地址和端口号。
          --stderrthreshold=2: 高于此级别的日志将被输出到错误控制台。
          --token="": 认证到API Server使用的令牌。
          --user="": 指定使用的kubeconfig配置文件中的用户名。
          --username="": API Server进行简单认证使用的用户名。
          --v=0: 指定输出日志的级别。
          --vmodule=: 指定输出日志的模块，格式如下：pattern=N，使用逗号分隔。

#### 参见 ####

*  [kubectl][] \- 使用kubectl来管理Kubernetes集群。
 *  http://kubernetes.kansea.com/docs/user-guide/kubectl/kubectl\_expose/

[kubectl]: http://kubernetes.kansea.com/docs/user-guide/kubectl/kubectl/