Open Cloud Blog

Now it is time to start a VM and attach it to one of the flat networks. This is really easy, as there is no need for the tenant to provision networks, subnets, routers and floating IPs to use them. The flat networks have been allocated by the cloud admin and have the attribute shared. […]

Now it is time to start a VM. Up to now, no DHCP server is running for the tenant’s network n1. # # first we need the ID of the image to be used # glance image-list +————————————–+———————–+————-+——————+———–+——–+ | ID | Name | Disk Format | Container Format | Size | Status | +————————————–+———————–+————-+——————+———–+——–+ | […]

Create a router and set a gateway Now it’s time to create a router and set a gateway. # # create a router neutron router-create r1 # # attach the router to floating pool 1 # # list the external networks # neutron net-external-list +————————————–+———————+—————————————————–+ | id | name | subnets | +————————————–+———————+—————————————————–+ | f79385f6-e878-4450-9ed9-e906f6985149 […]

After the successful deployment of the Operating system and the Openstack software, the external networks and the shared flat networks must be allocated by the Openstack admin. Allocate the floating pools (external networks) The neutron commands to create the two external networks for floating pools are: # run with admin credentials # # „vlannet“ is […]

When a distributed setup of Neutron is used, many Neutron configuration files must be synchronized to all nodes running neutron components. Linux network namespaces must be enabled. neutron.conf The base configuration file on the Control node contains many options. Some of these (not all!) are shown below in this deployment: # # does not contain […]

The physical network A cloud needs an „physical“ network using real „switching routers“ to transport data between the physical nodes. The physical network has the following layout: Each floating pool is implemented using one vlan on the physical network infrastructure. Each flat network requires also one vlan on the physical network. VXLAN requires also one […]