Re: [kubernetes-users] How hostNetwork : true works with K8s Internal Services?

['Tim Hockin' via Kubernetes user discussion and Q]

Kubernetes does not demand an overlay, and most of the overlays used
for kube employ some form of node gateway to allow packets to cross
between planes.

On Sat, Feb 3, 2018 at 12:59 PM, Chase  wrote:
> Hello - I am trying to understand how "hostNetwork: true" works with
> internal pod communication.  For example, if I create a daemonSet with
> hostNetwork : true and ClusterFirstWithHostNet should this pod be able to :
>
> 1.  Bind to the host network
> 2.  Communicate to services in the K8s network.
>
> The reason I ask is that in Docker if you bind to the host network you
> cannot communicate over the overlay network to other services.   It seems
> from reading the hostNetwork: true should works to allow both host and
> internal K8s communication.  Any explanation here would be great.
>
> Thanks
> Chase
>
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Re: [kubernetes-users] How hostNetwork : true works with K8s Internal Services?

['Matthias Rampke' via Kubernetes user discussion and Q]

Hey,

yes, I think this should work for any reasonable overlay. NodePorts are
also implemented essentially in the host network namespace, so if this
wouldn't work you would not have *any* way of getting traffic into the
cluster at least as far as I can see.

Of course, the best way to find out for your particular environment is to
try!

/MR

On Sat, Feb 3, 2018 at 8:59 PM Chase  wrote:

> Hello - I am trying to understand how "hostNetwork: true" works with
> internal pod communication.  For example, if I create a daemonSet with
> hostNetwork : true and ClusterFirstWithHostNet should this pod be able to
> :
>
> 1.  Bind to the host network
> 2.  Communicate to services in the K8s network.
>
> The reason I ask is that in Docker if you bind to the host network you
> cannot communicate over the overlay network to other services.   It seems
> from reading the hostNetwork: true should works to allow both host and
> internal K8s communication.  Any explanation here would be great.
>
> Thanks
> Chase
>
> --
> You received this message because you are subscribed to the Google Groups
> "Kubernetes user discussion and Q" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to kubernetes-users+unsubscr...@googlegroups.com.
> To post to this group, send email to kubernetes-users@googlegroups.com.
> Visit this group at https://groups.google.com/group/kubernetes-users.
> For more options, visit https://groups.google.com/d/optout.
>

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[kubernetes-users] How hostNetwork : true works with K8s Internal Services?

[Chase]

Hello - I am trying to understand how "hostNetwork: true" works with 
internal pod communication.  For example, if I create a daemonSet with 
hostNetwork : true and ClusterFirstWithHostNet should this pod be able to :

1.  Bind to the host network 
2.  Communicate to services in the K8s network.

The reason I ask is that in Docker if you bind to the host network you 
cannot communicate over the overlay network to other services.   It seems 
from reading the hostNetwork: true should works to allow both host and 
internal K8s communication.  Any explanation here would be great.

Thanks
Chase

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