Update cheatsheets

tldr/openstack-port

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openstack port
+
+> Manage OpenStack network ports (virtual network interfaces).
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/port.html>.
+
+- List all ports:
+
+`openstack port list`
+
+- Show detailed information about a specific port:
+
+`openstack port show {{port_id_or_name}}`
+
+- Create a port on a specific network:
+
+`openstack port create --network {{network_id_or_name}} {{port_name}}`
+
+- Create a port and assign it a fixed IP `192.168.1.50`:
+
+`openstack port create --network {{network_id}} --fixed-ip subnet={{subnet_id}},ip-address=192.168.1.50 {{port_name}}`
+
+- Delete a port:
+
+`openstack port delete {{port_id_or_name}}`