# Block port of a container running in a pod

**URL:** https://discuss.kubernetes.io/t/block-port-of-a-container-running-in-a-pod/16624
**Category:** General Discussions
**Tags:** podcast
**Created:** [July 7, 2021, 11:27am UTC](https://discuss.kubernetes.io/t/block-port-of-a-container-running-in-a-pod/16624 "2021-07-07T11:27:42Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![manoj](https://avatars.discourse-cdn.com/v4/letter/m/d9b06d/32.png) [@manoj](https://discuss.kubernetes.io/u/manoj)
#### Post date: [July 7, 2021, 11:27am UTC](https://discuss.kubernetes.io/t/block-port-of-a-container-running-in-a-pod/16624/1 "2021-07-07T11:27:42Z")

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Hi,  
How can I block a port in a container, which running inside a pod on kubernetes cluster.?

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### Author: ![protosam](https://sea2.discourse-cdn.com/flex016/user_avatar/discuss.kubernetes.io/protosam/32/7732_2.png) [@protosam](https://discuss.kubernetes.io/u/protosam)
#### Post date: [July 7, 2021, 1:44pm UTC](https://discuss.kubernetes.io/t/block-port-of-a-container-running-in-a-pod/16624/2 "2021-07-07T13:44:13Z")

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Pods are not isolated until they have a NetworkPolicy that selects them.

> **[Network Policies](https://kubernetes.io/docs/concepts/services-networking/network-policies/)**
>
> If you want to control traffic flow at the IP address or port level (OSI layer 3 or 4), then you might consider using Kubernetes NetworkPolicies for particular applications in your cluster. NetworkPolicies are an application-centric construct which...