Note port publishing needs in pods for create/run

Add notes to the podman-create and podman-run man pages
to note that ports do not need to be published and should not
be, for containers that will be part of a pod.

Addresses: #6769

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md
index b6c1fab17..09df87b2b 100644
--- a/docs/source/markdown/podman-run.1.md
+++ b/docs/source/markdown/podman-run.1.md
@@ -662,6 +662,14 @@ If it is not, the container port will be randomly assigned a port on the host.
 
 Use **podman port** to see the actual mapping: **podman port $CONTAINER $CONTAINERPORT**.
 
+**Note:** if a container will be run within a pod, it is not necessary to publish the port for
+the containers in the pod. The port must only be published by the pod itself.  Pod network
+stacks act like the network stack on the host - you have a variety of containers in the pod,
+and programs in the container, all sharing a single interface and IP address, and
+associated ports. If one container binds to a port, no other container can use that port
+within the pod while it is in use. Containers in the pod can also communicate over localhost
+by having one container bind to localhost in the pod, and another connect to that port.
+
 **--publish-all**, **-P**=**true**|**false**
 
 Publish all exposed ports to random ports on the host interfaces. The default is **false**.