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Chapter 9. Examples

Use the following examples to understand how to launch a compute instance post-deployment with various network configurations.

9.1. Example 1: Launching an instance with one NIC on the project and provider networks

Use this example to understand how to launch an instance with the private project network and the provider network after you deploy the all-in-one Red Hat OpenStack Platform (RHOSP) environment. The following example is based on a single NIC configuration and requires at least three IP addresses.

Prerequisites

  • One IP address for the OpenStack services.
  • One IP address for the virtual router to provide connectivity to the project network. This IP address is assigned automatically in this example.
  • At least one IP address for floating IPs on the provider network.

Procedure

  1. Create configuration helper variables: 

    # standalone with project networking and provider networking
export OS_CLOUD=standalone
export GATEWAY=192.168.25.1
export STANDALONE_HOST=192.168.25.2
export PUBLIC_NETWORK_CIDR=192.168.25.0/24
export PRIVATE_NETWORK_CIDR=192.168.100.0/24
export PUBLIC_NET_START=192.168.25.4
export PUBLIC_NET_END=192.168.25.15
export DNS_SERVER=1.1.1.1

  2. Create a basic flavor: 

    $ openstack flavor create --ram 512 --disk 1 --vcpu 1 --public tiny

  3. Download CirrOS and create an OpenStack image: 

    $ wget https://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img
$ openstack image create cirros --container-format bare --disk-format qcow2 --public --file cirros-0.4.0-x86_64-disk.img

  4. Configure SSH: 

    $ ssh-keygen -m PEM -t rsa -b 2048 -f ~/.ssh/id_rsa_pem
$ openstack keypair create --public-key ~/.ssh/id_rsa_pem.pub default

  5. Create a simple network security group: 

    $ openstack security group create basic

  6. Configure the new network security group:

    1. Enable SSH: 

      $ openstack security group rule create basic --protocol tcp --dst-port 22:22 --remote-ip 0.0.0.0/0

    2. Enable ping: 

      $ openstack security group rule create --protocol icmp basic

    3. Enable DNS: 

      $ openstack security group rule create --protocol udp --dst-port 53:53 basic

  7. Create Neutron networks: 

    $ openstack network create --external --provider-physical-network datacentre --provider-network-type flat public
$ openstack network create --internal private
$ openstack subnet create public-net \
    --subnet-range $PUBLIC_NETWORK_CIDR \
    --no-dhcp \
    --gateway $GATEWAY \
    --allocation-pool start=$PUBLIC_NET_START,end=$PUBLIC_NET_END \
    --network public
$ openstack subnet create private-net \
    --subnet-range $PRIVATE_NETWORK_CIDR \
    --network private

  8. Create a virtual router: 

    # NOTE: In this case an IP will be automatically assigned
# from the allocation pool for the subnet.
$ openstack router create vrouter
$ openstack router set vrouter --external-gateway public
$ openstack router add subnet vrouter private-net

  9. Create a floating IP: 

    $ openstack floating ip create public

  10. Launch the instance: 

    $ openstack server create --flavor tiny --image cirros --key-name default --network private --security-group basic myserver

  11. Assign the floating IP: 

    $ openstack server add floating ip myserver <FLOATING_IP>
    • Replace <FLOATING_IP> with the address of the floating IP that you created.

  12. Test SSH: 

    ssh cirros@<FLOATING_IP>
    • Replace <FLOATING_IP> with the address of the floating IP that you created.

Network Architecture

Standalone1NIC Tenant Provider

9.2. Example 2: Launching an instance with one NIC on the provider network

Use this example to understand how to launch an instance with the provider network after you deploy the all-in-one Red Hat OpenStack Platform environment. This example is based on a single NIC configuration and requires at least four IP addresses.

Prerequisites

  • One IP address for the OpenStack services.
  • One IP address for the virtual router to provide connectivity to the project network. This IP address is assigned automatically in this example.
  • One IP address for DHCP on the provider network.
  • At least one IP address for floating IPs on the provider network.

Procedure

  1. Create configuration helper variables: 

    # standalone with project networking and provider networking
export OS_CLOUD=standalone
export GATEWAY=192.168.25.1
export STANDALONE_HOST=192.168.25.2
export VROUTER_IP=192.168.25.3
export PUBLIC_NETWORK_CIDR=192.168.25.0/24
export PUBLIC_NET_START=192.168.25.4
export PUBLIC_NET_END=192.168.25.15
export DNS_SERVER=1.1.1.1

  2. Create a basic flavor: 

    $ openstack flavor create --ram 512 --disk 1 --vcpu 1 --public tiny

  3. Download CirrOS and create an OpenStack image: 

    $ wget https://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img
$ openstack image create cirros --container-format bare --disk-format qcow2 --public --file cirros-0.4.0-x86_64-disk.img

  4. Configure SSH: 

    $ ssh-keygen -m PEM -t rsa -b 2048 -f ~/.ssh/id_rsa_pem
$ openstack keypair create --public-key ~/.ssh/id_rsa_pem.pub default

  5. Create a simple network security group: 

    $ openstack security group create basic

  6. Configure the new network security group:

    1. Enable SSH: 

      $ openstack security group rule create basic --protocol tcp --dst-port 22:22 --remote-ip 0.0.0.0/0

    2. Enable ping: 

      $ openstack security group rule create --protocol icmp basic

  7. Create Neutron networks: 

    $ openstack network create --external --provider-physical-network datacentre --provider-network-type flat public
$ openstack network create --internal private
$ openstack subnet create public-net \
    --subnet-range $PUBLIC_NETWORK_CIDR \
    --gateway $GATEWAY \
    --allocation-pool start=$PUBLIC_NET_START,end=$PUBLIC_NET_END \
    --network public \
    --host-route destination=0.0.0.0/0,gateway=$GATEWAY \
    --dns-nameserver $DNS_SERVER

  8. Launch the instance: 

    $ openstack server create --flavor tiny --image cirros --key-name default --network public --security-group basic myserver

  9. Test SSH: 

    ssh cirros@<VM_IP>
    • Replace <VM_IP> with the address of the virtual machine that you created.

Network Architecture

Standalone1NIC Provider

9.3. Example 3: Launching an instance with two NICs on the project and provider networks

Use this example to understand how to launch an instance with the private project network and the provider network after you deploy the all-in-one Red Hat OpenStack Platform environment. This example is based on a dual NIC configuration and requires at least four IP addresses on the provider network.

Prerequisites

  • One IP address for a gateway on the provider network.
  • One IP address for OpenStack endpoints.
  • One IP address for the virtual router to provide connectivity to the project network. This IP address is assigned automatically in this example.
  • At least one IP address for floating IPs on the provider network.

Procedure

  1. Create configuration helper variables: 

    # standalone with project networking and provider networking
export OS_CLOUD=standalone
export GATEWAY=192.168.25.1
export STANDALONE_HOST=192.168.0.2
export PUBLIC_NETWORK_CIDR=192.168.25.0/24
export PRIVATE_NETWORK_CIDR=192.168.100.0/24
export PUBLIC_NET_START=192.168.25.3
export PUBLIC_NET_END=192.168.25.254
export DNS_SERVER=1.1.1.1

  2. Create a basic flavor: 

    $ openstack flavor create --ram 512 --disk 1 --vcpu 1 --public tiny

  3. Download CirrOS and create an OpenStack image: 

    $ wget https://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img
$ openstack image create cirros --container-format bare --disk-format qcow2 --public --file cirros-0.4.0-x86_64-disk.img

  4. Configure SSH: 

    $ ssh-keygen -m PEM -t rsa -b 2048 -f ~/.ssh/id_rsa_pem
$ openstack keypair create --public-key ~/.ssh/id_rsa_pem.pub default

  5. Create a simple network security group: 

    $ openstack security group create basic

  6. Configure the new network security group:

    1. Enable SSH: 

      $ openstack security group rule create basic --protocol tcp --dst-port 22:22 --remote-ip 0.0.0.0/0

    2. Enable ping: 

      $ openstack security group rule create --protocol icmp basic

    3. Enable DNS: 

      $ openstack security group rule create --protocol udp --dst-port 53:53 basic

  7. Create Neutron networks: 

    $ openstack network create --external --provider-physical-network datacentre --provider-network-type flat public
$ openstack network create --internal private
$ openstack subnet create public-net \
    --subnet-range $PUBLIC_NETWORK_CIDR \
    --no-dhcp \
    --gateway $GATEWAY \
    --allocation-pool start=$PUBLIC_NET_START,end=$PUBLIC_NET_END \
    --network public
$ openstack subnet create private-net \
    --subnet-range $PRIVATE_NETWORK_CIDR \
    --network private

  8. Create a virtual router: 

    # NOTE: In this case an IP will be automatically assigned
# from the allocation pool for the subnet.
$ openstack router create vrouter
$ openstack router set vrouter --external-gateway public
$ openstack router add subnet vrouter private-net

  9. Create a floating IP: 

    $ openstack floating ip create public

  10. Launch the instance: 

    $ openstack server create --flavor tiny --image cirros --key-name default --network private --security-group basic myserver

  11. Assign the floating IP: 

    $ openstack server add floating ip myserver <FLOATING_IP>
    • Replace <FLOATING_IP> with the address of the floating IP that you created.

  12. Test SSH: 

    ssh cirros@<FLOATING_IP>
    • Replace <FLOATING_IP> with the address of the floating IP that you created.

Network Architecture

Standalone2NIC Tenant Provider

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