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cldemo Reference Topology

In order to run Cumulus Networks' demos, it is assumed that you are already using a common topology with an out of band network. This Vagrantfile and associated helper scripts provisions a virtual version of the internal Cumulus Linux Demo Reference Topology used for demo development and testing.

This topology is designed to support both Layer 2 and Layer 3 high availability routing without having to replace cables or devices between demos. As such, much of the cabling will be unused depending on the actual demo or use case. It is for this reason that while many best practices are implemented in the design of this topology, discretion should be exercised when adapting this to a production network.

In addition to creating the VMs and networking, the following steps are completed for your convenience. If try to run a demo on factory-reset physical equipment, you may need to run these steps manually.

  • DHCP, DNS, and Apache are installed and configured on the oob-mgmt-server
  • Static MAC address entries are added to DHCP on the oob-mgmt-server for all devices
  • A bridge is created on the oob-mgmt-switch to connect all devices eth0 interfaces together
  • A private key for the Cumulus user is installed on the oob-mgmt-server
  • Public keys for the cumulus user are installed on all of the devices, allowing passwordless ssh
  • A NOPASSWD stanza is added for the cumulus user in the sudoers file of all devices

This Vagrantfile is not supported by Cumulus Networks and is provided for your personal education or evaluation. If you run into trouble, feel free to share your story with the Cumulus Networks Community.

Instructions

Before running, ensure that you have Ansible version 1.9.4 and Vagrant version 1.8.4 installed. This includes the Python Ansible package installable via Pip.

To bring up the entire reference topology...

git clone https://github.com/cumulusnetworks/cldemo-vagrant
cd cldemo-vagrant
vagrant plugin install cumulus-vagrant
vagrant up

To access your various devices...

vagrant ssh oob-mgmt-server
sudo su - cumulus
ssh leaf01

To reprovision a specific device...

vagrant destroy -f leaf01
vagrant up leaf01

To shut down and delete all VMs...

vagrant destroy -f

To run a cldemo.

vagrant up
vagrant ssh oob-mgmt-server
sudo su - cumulus
git clone https://github.com/cumulusnetworks/cldemo-xxxxx
cd cldemo-xxxxxx
cat README.md
# follow instructions

Running Smaller Topologies

Demos do not necessarily need the full reference topology. You can bring up a subset of the topology using the following commands.

# two-switch: good for quick and dirty prototyping
vagrant up oob-mgmt-server oob-mgmt-switch leaf01 leaf02

# half-rack: used for most cldemos
vagrant up oob-mgmt-server oob-mgmt-switch leaf01 leaf02 spine01 spine02 server01 server02

# full-rack: usually used to demonstrate quagga on the host with dual-attached servers
vagrant up oob-mgmt-server oob-mgmt-switch leaf01 leaf02 leaf03 leaf04 spine01 spine02 server01 server02 server03 server04

# extended: includes exit leaves, an edge device, and a simulated internet node
vagrant up

The extended reference topology provisions 16 devices totalling 8 GB of memory. To reduce the memory load, you can run python build-topology topology-extended-lite.json, which will create VX instances with 256 MB of RAM instead of 512 GB, bringing the total to 6 GB. The 'lite' topology can be used for many of the Ansible demos that don't involve installing agents on the switches, but demos such as the Puppet demo won't work.

Customizing the Topology

You can customize the topology using the python script build-topology.py. This script reads a JSON file (see topology-extended.json for an example) and produces a Vagrantfile to match the topology.

Advanced: Libvirt Instructions

Using KVM to provision the topology is an advanced topic and not documented. These steps are provided as a starting point. Good luck!

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:linuxsimba/libvirt-udp-tunnel
sudo apt-get update -y
sudo apt-get install autoconf python-dev git libvirt-dev libvirt-bin qemu-utils qemu-kvm -y
wget https://releases.hashicorp.com/vagrant/1.8.1/vagrant_1.8.1_x86_64.deb
sudo dpkg -i vagrant_1.8.1_x86_64.deb
vagrant box install CumulusCommunity/cumulus-vx
vagrant box install boxcutter/ubuntu1404
vagrant plugin install vagrant-cumulus
vagrant plugin install vagrant-libvirt
vagrant plugin install vagrant-mutate
vagrant plugin install --plugin-version 0.0.3 fog-libvirt
vagrant mutate CumulusCommunity/cumulus-vx libvirt
vagrant mutate boxcutter/ubuntu1404 libvirt
# add your user to the appropriate libvirt or libvirtd group           
sudo service libvirt-bin restart
virsh pool-define-as --name default --type dir --target /var/lib/libvirt/images
virsh pool-autostart default
virsh pool-build default
virsh pool-start default
wget https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py
sudo pip install ansible==1.9.4
git clone https://github.com/cumulusnetworks/cldemo-vagrant