Kubectl expose: Difference between revisions
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* [[Kubectl#Commands|kubectl]] | * [[Kubectl#Commands|kubectl]] | ||
* [[Kubernetes Service Operations]] | |||
=Overview= | =Overview= | ||
<code>expose</code> dynamically exposes a resource, which can be a [[Kubernetes_Pod_and_Container_Concepts#Pod|pod]], another [[Kubernetes_Service_Concepts#Service|service]], a replication controller | <code>expose</code> dynamically exposes a resource, which can be a [[Kubernetes_Pod_and_Container_Concepts#Pod|pod]], another [[Kubernetes_Service_Concepts#Service|service]], a [[Kubernetes_Deployments|deployment]], [[Kubernetes_ReplicaSet|replica set]] or a [[Kubernetes_ReplicationController|replication controller]] as a new service. If no service type is explicitly specified, [[Kubernetes_Service_Concepts#ClusterIP|ClusterIP]] is assumed. Specific service types ([[Kubernetes_Service_Concepts#NodePort|NodePort]], [[Kubernetes_Service_Concepts#LoadBalancer|LoadBalancer]], or [[Kubernetes_Service_Concepts#ExternalName|ExternalName]]) can be requested with <code>--type</code>. | ||
=Expose a Pod= | =Expose a Pod= | ||
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<syntaxhighlight lang='bash'> | <syntaxhighlight lang='bash'> | ||
kubectl [-n <namespace>] expose pod <pod-name> --port=<port> --target-port=<target-port> | kubectl [-n <namespace>] expose pod <pod-name> \ | ||
--name=<service-name> --port=<port> --target-port=<target-port> \ | |||
[--type=ClusterIP|NodePort|...] | |||
</syntaxhighlight> | </syntaxhighlight> | ||
<syntaxhighlight lang='bash'> | <syntaxhighlight lang='bash'> | ||
kubectl expose pod httpd --port=9898 --target-port=80 | kubectl expose pod httpd --name=httpd-svc --port=9898 --target-port=80 | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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If a replication controller, deployment or replicaset are used, the command <font color=darkgray>reads their selector and re-uses it for the service being created.</font> | If a replication controller, deployment or replicaset are used, the command <font color=darkgray>reads their selector and re-uses it for the service being created.</font> | ||
=Deployment= | |||
<syntaxhighlight lang='text'> | |||
kubectl expose deployment my-deployment --name=my-service --type=ClusterIP | |||
</syntaxhighlight> | |||
<syntaxhighlight lang='bash'> | |||
kubectl expose deployment http-server --port=9999 --type=NodePort --name=http-service --overrides '{ "apiVersion": "v1","spec":{"ports": [{"port":9999,"protocol":"TCP","targetPort":9999,"nodePort":30999}]}}' | |||
</syntaxhighlight> | |||
=Expose a Service= | =Expose a Service= | ||
<font color= | <font color=darkkhaki>TODO | ||
</font> | |||
Latest revision as of 18:42, 6 December 2023
Internal
Overview
expose dynamically exposes a resource, which can be a pod, another service, a deployment, replica set or a replication controller as a new service. If no service type is explicitly specified, ClusterIP is assumed. Specific service types (NodePort, LoadBalancer, or ExternalName) can be requested with --type.
Expose a Pod
If a pod is used, the command reads the pod's labels and creates a service with a matching selector. By default, if no type is specified, ClusterIP is assumed.
kubectl [-n <namespace>] expose pod <pod-name> \
--name=<service-name> --port=<port> --target-port=<target-port> \
[--type=ClusterIP|NodePort|...]
kubectl expose pod httpd --name=httpd-svc --port=9898 --target-port=80
Expose a Higher Level Controller
If a replication controller, deployment or replicaset are used, the command reads their selector and re-uses it for the service being created.
Deployment
kubectl expose deployment my-deployment --name=my-service --type=ClusterIP
kubectl expose deployment http-server --port=9999 --type=NodePort --name=http-service --overrides '{ "apiVersion": "v1","spec":{"ports": [{"port":9999,"protocol":"TCP","targetPort":9999,"nodePort":30999}]}}'
Expose a Service
TODO