Steps to create initial networks for OpenStack

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[Steps summarised from http://docs.openstack.org/icehouse/install-guide/install/yum/content/neutron-initial-networks.html]

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Pre-requisites

Run steps from link http://itinsteps.blogspot.in/2014/06/steps-to-setup-openstack-command-line.html to setup command line tools for OpenStack.
Run steps from link http://itinsteps.blogspot.in/2014/06/steps-to-create-new-tenant-and-users-on.html to create a tenant and user for OpenStack.

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Change the iptables rule for Neutron Server to allow command line access from an IP other than the OpenStack Controller Node

On the Controller node, in file /etc/sysconfig/iptables, remove the line
-A INPUT -s 192.168.2.6/32 -p tcp -m multiport --dports 9696 -m comment --comment "001 neutron server incoming neutron_server_192.168.2.6_192.168.2.6" -j ACCEPT

and in its place, add the line
-A INPUT -p tcp -m multiport --dports 9696 -m comment --comment "Neutron incoming ALL" -j ACCEPT

Restart iptables service to enable the change
# service iptables restart

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On the node where OpenStack Command Line tools are installed, set environment for the user admin tenant admin

# source ~/keystonerc_admin

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Create external networ

 # neutron net-create <external-network-name> --shared --router:external=True

Example

# neutron net-create Ext1 --shared --router:external=True

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Create subnet for the external networ

 # neutron subnet-create <external-network-name> --name <external-network-subnet-name> \
  --allocation-pool start=<start-floating-IP>,end=<end-floating-IP> \
  --disable-dhcp --gateway <external-network-gateway-IP> <external-network-CIDR>

Example 

 # neutron subnet-create Ext1 --name Ext1Subnet1 \
  --allocation-pool start=192.168.3.51,end=192.168.3.230 \
  --disable-dhcp --gateway 192.168.3.1 192.168.3.0/24

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Set environment for your specific user and tenant

# source ~/keystonerc_<user-name>

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Create tenant network

# neutron net-create <tenant-network-name>

Example

# neutron net-create Private1

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Create subnet for the tenant network

# neutron subnet-create <tenant-network-name> --name <tenant-network-subnet-name> \
  --gateway <tenant-network-gateway-IP> <tenant-network-CIDR>
 
Example

# neutron subnet-create Private1 --name Private1Subnet1 \
  --gateway 10.10.3.1 10.10.3.0/24
 

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Create a router on the tenant network 

# neutron router-create <router-name>

Example

# neutron router-create Router1

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Attach tenant networks to the router

# neutron router-interface-add <router-name> <tenant-network-subnet-name>

Example

# neutron router-interface-add Router1 Private1Subnet1

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Attach external network to the router

# neutron router-gateway-set <router-name> <external-network-name>

Example

# neutron router-gateway-set Router1 Ext1

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Verify network connectivity by pinging the tenant router gateway

# ping -c 4 <router-gateway-IP>

Example

# ping -c 4 192.168.3.51

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Assign Floating IP to the tenant

# nova floating-ip-create <external-network-name>

Note the IP address as <floating-IP> to be used to assign to an instance.

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