Automating Networking! Do I Have to Start at Ground Zero?
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Automating Networking! Do I Have to Start at Ground Zero?
- 1. v Automating Networking! Do I Have to Start at Ground Zero? Gerard Chami - Technical Support Engineer
- 2. Me! 2 Gerard Chami Technical Support Engineer gchami@cumulusnetworks.com Twitter: @gerardchami github: https://github.com/gchami
- 3. What is Cumulus Linux? 3 BIOS and PXE Industry Standard Server SERVER OS NETWORK OS Boot Loader and Industry Standard Switch
- 4. cumulusnetworks.com UserSpaceArchitecture– Cumulus Linux Operating System as a Platform 4 Switch Driver switchd CPU, RAM, Flash, etc. Routing Tables ARP Table Bridge Table Ethernet Interfaces LinuxKernel Automation Monitoring Third Party/Customer Applications Network Orchestration Routing Suite Bridging VXLAN Switch Silicon Front Panel Ports
- 5. cumulusnetworks.com But Why should we care? Your choice of a network OS! Provides Hardware Choice Build and Automate on a Linux OS Oh and its just Linux! Treat my switch as a server!
- 6. Cumulus Networks ▪ Infrastructure as code ▪ Enforcement from central location ▪ Easy change control Configuration ManagementHot Swap the Whole Switch ▪ With automation the whole switch can be replaced and provisioned ▪ High capacity, fine-grained failure domain ▪ Weeks and months now take seconds ▪ Pods of equipment can be stamped out in multiple locations Rapid Provisioning 6 NetDevOps: The 90’s called, they want their frosted tips back! OBM OBM OBM
- 7. 7 Where do we start?
- 8. cumulusnetworks.com The Obvious (or is it?) Git!….Check out our Github for examples! https://github.com/CumulusNetworks Cumulus Workbench - See this in action! Puppet Forge - Cumulus Linux Modules + Debian modules Cumulus VX - Play, Test, Develop and deploy on the free virtual machines NetDevOps - We will get there!
- 9. cumulusnetworks.com Bringing it all together! Task 1: Installing and booting a Network OS Task 2: Installing Puppet Agent
- 10. cumulusnetworks.com ONIE – Open Network Install Environment Modern, efficient installer Network OS installer • Discovery, transfer, and execution • Implemented through Linux kernel with BusyBox (OpenWRT- like) Industry support Enables open network hardware ecosystem Open source Well-documented • http://www.onie.org/ 10
- 11. cumulusnetworks.com Zero Touch Provisioning Automation option at first Cumulus Linux boot Request DHCP lease on management network If option 239 and URL in response, then: • Request contents of script at URL • Parse script for CUMULUS-AUTOPROVISIONING • Execute script locally on switch as root (unless previously successfully run) Supported languages Bash Perl Python Ruby 11 If eth0 is set to DHCP, Zero Touch Provisioning can be triggered (unless previously successful run) when: • Switch boots up • eth0 is brought down and up
- 12. cumulusnetworks.com ONIE and ZTP Interaction 12 DHCP Request with ONIE Option DHCP Address with URL for OS Image DHCP Request with ZTP Option DHCP Address with ZTP script URL Pull Puppet Scripts OS BootedOS Booted Baseline Configuration AppliedBaseline Configuration Applied Device Specific Configuration AppliedDevice Specific Configuration Applied
- 13. cumulusnetworks.com Bringing it all together! Task 1 => Installing and booting a Network OS Task 2 => Installing Puppet Agent Task 3 => Now What????
- 14. cumulusnetworks.com What are we automating!?!
- 15. Our desired state - Without touching the switch! 15 Install the OS ZTP Provisioning Install Puppet agent Configure MOTD Configure PTM Configure interfaces Configure SVI Deploy OSPF Deploy Bridges
- 16. Modules can be your friends cumuluslinux/cumulus_interfaces cumuluslinux/cumulus_interface_policy cumuluslinux/cumulus_license cumuluslinux/cumulus_ports 16
- 18. 18 Install the OS ZTP Provisioning Install Puppet agent Configure MOTD Configure PTM Configure interfaces Configure SVI Deploy OSPF Deploy Bridges Our desired state - Without touching the switch!
- 19. Cumulus Networks 19 Cumulus VX Want to learn networking? No Cumulus Switches? No Problem!
- 21. © 2014 Cumulus Networks. Cumulus Networks, the Cumulus Networks Logo, and Cumulus Linux are trademarks or registered trademarks of Cumulus Networks, Inc. or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners. The registered trademark Linux® is used pursuant to a sublicense from LMI, the exclusive licensee of Linus Torvalds, owner of the mark on a world-wide basis. Thank You! 21
Editor's Notes
- Up until now their has not been a hardware agnostic Network operating system. Cumulus Networks is here to change that. Beyond that we see incredible power in allowing the same sort of choice in applications as we've previously highlighted in hardware. Cumulus Linux is Debian based Linux distribution. Wheezy distribution. This allows customers to draw from the existing ecosystems of Linux tool sets. This is an overview of the applications you can run on a Linux network OS. For example there is a very good routing stack called Quagga. We’ve taken Quagga, added additional features where required, fixed scaling issues and generaly hardened this routing stack. Like a good Linux systems we’ve up streamed all these improvements back to the Linux community at large. But in the interest of choice, if you prefer the routing capability of a different routing stack….for example Bird, you are free to use this as well. You have the choice to tune our Network Operating Stack to your requirements with our without our help. Propreietary vendors and several Linux based hardware vendors Many of the other network vendors claim to be interoperable with Linux tools….take puppet as an example. But, their Puppet agent is not the standard full featured current release from Puppet, it’s a vendor spefic agent tied to a specific puppet version that allows for limited functionality dictated by the networking vendor. This a proof point that highlight the difference between a Linux based OS and native At Cumulus Linux we are enablers not gate keepers.
- Once you understand the power of choice and solutions brought about by Cumulus Linux, the next step is to integrate Cumulus Linux into brownfield and greenfield architectures. IP Fabrics are the most flexible network architectures when it comes to high capacity, scale and evolution. Enables Scale-out architecture Easy to configure and troubleshoot Easy to add new racks Standard OSPF/BGP – helps with interoperability Can be used as an underlay in conjunction with Network Virtualization Overlays Network Virtualization Overlays add additional flexibility Flexible Virtual Network Scalable, Multi-tenant Integrated with Cloud Orchestration tools Yet, they need a simple migration path coexistent with their existing network architecture CL2.5 brings the flexibility of L2MLAG network architectures CL2.5 brings the flexibility of L2MLAG network architectures. Customers can now drop in a networking hardware running Cumulus Linux in existing environments and migrate at their pace and based on the needs to Modern DC networks. FHRP, Improved Linux-bridging and ifupdown2 integration for required L2 fabrics, L2 scale
- Starting with that “loading dock to production” model, let’s begin with the first piece of software that is encountered - ONIE Cumulus supported platforms are pre loaded with ONIE, this an open source boot loader originally built by Cumulus engineers This can be considered PXE on steroids, it was built to be flexible enough for a number of management environments. If you’re familiar with OpenWRT, ONIE is very much a stripped down but fully functional Linux OS The code base was recently adopted by the Open Compute Project and has extensive documentation
- All traditional network operating systems have some level of automated initial configuration fetching. This is usually limited towards pushing a well crafted configuration file Cumulus Linux takes a different approach, similar to a post kickstart script or fai helper script This implementation closely follows the ONIE model: fetching a script over the management interface and executing Cumulus Linux offers several common scripting languages – pre installed, all of which are available for ZTP script to be written against Just as with ONIE, state is preserved. If the ZTP script fails or doesn’t complete, it will be fetched on the next system boot.