Create provider network:

openstack network create  --share --external \
  --provider-physical-network provider \
  --provider-network-type flat provider

openstack subnet create --network provider \
  --allocation-pool start=192.168.122.20,end=192.168.122.200 \
  --dns-nameserver 192.168.122.1 --gateway 192.168.122.1 \
  --subnet-range 192.168.122.0/24 provider
  

openstack security group rule create --proto icmp default
openstack security group rule create --proto tcp --dst-port 22 default


Generate a key pair:
ssh-keygen -q -N ""

cd to your home directory
openstack keypair create --public-key ~/.ssh/id_rsa.pub mykey

verify
openstack keypair list


openstack flavor create --id 0 --vcpus 2 --ram 1024 --disk 10 m1.nano

Download debian openstack image
https://cdimage.debian.org/cdimage/openstack/
 
upload it:
openstack image create \
  --container-format bare \
  --disk-format qcow2 \
  --property hw_disk_bus=scsi \
  --property hw_scsi_model=virtio-scsi \
  --property os_type=linux \
  --property os_distro=debian \
  --property os_admin_user=debian \
  --property os_version='10.12.7' \
  --public \
  --file debian-10.12.7-20220706-openstack-amd64.qcow2 \
  debian-10.12.7-openstack-amd64


openstack network list
+--------------------------------------+----------+--------------------------------------+
| ID                                   | Name     | Subnets                              |
+--------------------------------------+----------+--------------------------------------+
| da5f9aa8-1bac-4aab-9931-0ce4d835783a | provider | eeeb4a46-8bb0-442b-b81c-20103c2d7f80 |
+--------------------------------------+----------+--------------------------------------+

copy ID as net-id while creating server


openstack server create --flavor m1.nano --image debian-10.12.7-openstack-amd64 \
  --nic net-id=da5f9aa8-1bac-4aab-9931-0ce4d835783a --security-group default \
  --key-name mykey debianinstance

if you get error like "More than one SecurityGroup exists with the name 'default'."

check
openstack security group list
+--------------------------------------+---------+------------------------+----------------------------------+------+
| ID                                   | Name    | Description            | Project                          | Tags |
+--------------------------------------+---------+------------------------+----------------------------------+------+
| cd54c8c9-d754-434a-9f5c-807c3288fced | default | Default security group | 53c2118ffdbb4b6388611480c7c7a7c0 | []   |
| f9151d2a-f49b-4828-9467-418d7cdfd1e8 | default | Default security group | 87b3104005904a2fbe18ad1a7ab601b3 | []   |
+--------------------------------------+---------+------------------------+----------------------------------+------+

inspect which one you enabled icmp and port 22
openstack security group show cd54c8c9-d754-434a-9f5c-807c3288fced

specify security group id instead of name

openstack server create --flavor m1.nano --image debian-10.12.7-openstack-amd64 \
  --nic net-id=b2d69a6e-3a77-4d55-94fd-308558088a3d --security-group cd54c8c9-d754-434a-9f5c-807c3288fced \
  --key-name mykey debianinstance


verify
openstack server list