Creating openstack new security group, and allowing inbound port

To see existing security group
$ openstack security group list

To create a new security group named ssh-allow
$ openstack security group create  ssh-allow

To allow port 22 inbound (ingress)
$ openstack security group rule create --ingress --proto tcp --dst-port 22 ssh-allow

To see if our port allowance is successfully implemented (use --fit-width to format the output properly)
$ openstack security group show ssh-allow --fit-width