Document protocol usage for --publish

This also unifies the documentation of `--publish` for `podman create`, `podman run`, and `podman pod create`.

Signed-off-by: Daniel Rudolf <github.com@daniel-rudolf.de>

3 files changed, 44 insertions, 20 deletions

diff --git a/docs/source/markdown/podman-create.1.md b/docs/source/markdown/podman-create.1.md
index c63e8814b..f8ea27041 100644
--- a/docs/source/markdown/podman-create.1.md
+++ b/docs/source/markdown/podman-create.1.md
@@ -824,22 +824,27 @@ container.
 
 Rootless containers cannot have more privileges than the account that launched them.
 
-#### **--publish**, **-p**=*port*
+#### **--publish**, **-p**=[[_ip_:][_hostPort_]:]_containerPort_[/_protocol_]
 
-Publish a container's port, or range of ports, to the host
+Publish a container's port, or range of ports, to the host.
 
-Format: `ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort | containerPort`
 Both hostPort and containerPort can be specified as a range of ports.
-When specifying ranges for both, the number of container ports in the range must match the number of host ports in the range.
-(e.g., `podman run -p 1234-1236:1222-1224 --name thisWorks -t busybox`
-but not `podman run -p 1230-1236:1230-1240 --name RangeContainerPortsBiggerThanRangeHostPorts -t busybox`)
-With host IP: `podman run -p 127.0.0.1:$HOSTPORT:$CONTAINERPORT --name CONTAINER -t someimage`
+When specifying ranges for both, the number of container ports in the
+range must match the number of host ports in the range.
+
 If host IP is set to 0.0.0.0 or not set at all, the port will be bound on all IPs on the host.
+
+By default, Podman will publish TCP ports. To publish a UDP port instead, give
+`udp` as protocol. To publish both TCP and UDP ports, set `--publish` twice,
+with `tcp`, and `udp` as protocols respectively. Rootful containers can also
+publish ports using the `sctp` protocol.
+
 Host port does not have to be specified (e.g. `podman run -p 127.0.0.1::80`).
 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
+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
diff --git a/docs/source/markdown/podman-pod-create.1.md b/docs/source/markdown/podman-pod-create.1.md
index 714909b98..24c0f8178 100644
--- a/docs/source/markdown/podman-pod-create.1.md
+++ b/docs/source/markdown/podman-pod-create.1.md
@@ -208,16 +208,30 @@ Set the PID mode for the pod. The default is to create a private PID namespace f
 
 Write the pod ID to the file.
 
-#### **--publish**=*port*, **-p**
+#### **--publish**, **-p**=[[_ip_:][_hostPort_]:]_containerPort_[/_protocol_]
 
-Publish a port or range of ports from the pod to the host.
+Publish a container's port, or range of ports, within this pod to the host.
 
-Format: `ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort | containerPort`
 Both hostPort and containerPort can be specified as a range of ports.
-When specifying ranges for both, the number of container ports in the range must match the number of host ports in the range.
-Use `podman port` to see the actual mapping: `podman port CONTAINER $CONTAINERPORT`.
+When specifying ranges for both, the number of container ports in the
+range must match the number of host ports in the range.
 
-NOTE: This cannot be modified once the pod is created.
+If host IP is set to 0.0.0.0 or not set at all, the port will be bound on all IPs on the host.
+
+By default, Podman will publish TCP ports. To publish a UDP port instead, give
+`udp` as protocol. To publish both TCP and UDP ports, set `--publish` twice,
+with `tcp`, and `udp` as protocols respectively. Rootful containers can also
+publish ports using the `sctp` protocol.
+
+Host port does not have to be specified (e.g. `podman run -p 127.0.0.1::80`).
+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:** You must not publish ports of containers in the pod individually,
+but only by the pod itself.
+
+**Note:** This cannot be modified once the pod is created.
 
 #### **--replace**
 
diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md
index 9d9394020..382563e30 100644
--- a/docs/source/markdown/podman-run.1.md
+++ b/docs/source/markdown/podman-run.1.md
@@ -862,22 +862,27 @@ points, Apparmor/SELinux separation, and Seccomp filters are all disabled.
 
 Rootless containers cannot have more privileges than the account that launched them.
 
-#### **--publish**, **-p**=_ip_:_hostPort_:_containerPort_ | _ip_::_containerPort_ | _hostPort_:_containerPort_ | _containerPort_
+#### **--publish**, **-p**=[[_ip_:][_hostPort_]:]_containerPort_[/_protocol_]
 
 Publish a container's port, or range of ports, to the host.
 
 Both hostPort and containerPort can be specified as a range of ports.
-
-When specifying ranges for both, the number of container ports in the range must match the number of host ports in the range.
+When specifying ranges for both, the number of container ports in the
+range must match the number of host ports in the range.
 
 If host IP is set to 0.0.0.0 or not set at all, the port will be bound on all IPs on the host.
 
+By default, Podman will publish TCP ports. To publish a UDP port instead, give
+`udp` as protocol. To publish both TCP and UDP ports, set `--publish` twice,
+with `tcp`, and `udp` as protocols respectively. Rootful containers can also
+publish ports using the `sctp` protocol.
+
 Host port does not have to be specified (e.g. `podman run -p 127.0.0.1::80`).
 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**.
+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
+**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