TADSummit Innovation Showcase chaired by Michael Lazar, DataArt. Achieving Amazon and Google Cloud economics with Immutable Diskless Compute Pool for zero-time provisioning, using a Ceph-based storage open source solution.

1. New York USA
London UK
Munich Germany
Zug Switzerland
New York USA
London UK
Munich Germany
Zug Switzerland
TAD Summit 2017
Immutable Diskless Pool Demo

2. Introducing DataArt:
Global Technology Consultancy
22 Global Locations:
• NYC
• London
• Switzerland
DataArt’s Core Offers
• Controlling Costs via Managed Services
• Building New Products and Services
• Modernizing and Re-engineering Legacy systems
• Consulting on New Technology Approaches
Providing On-Demand IT
In operation
20 years
Consultants & engineers
2500+
Staff Turnover
<7%
Return clients
95%
Development Hours
15+ million
Successfully
completed projects
1700+
Finance Betting and
Gaming
TelecomMedia &
Entertainment
IoTHealthcare &
Life Sciences
Travel &
Hospitality

3. Immutable Diskless Compute Pool
Technologies

4. The default approach to instantiate boot volumes in OpenStack Ocata (and newer) is using
Cinder backed block storage.
• When compute pool is growing, the risk of failure of particular node is increasing along with
effort required to maintain the compute pool and keep it up to date
• In case if Cinder is deployed with CEPH or with any supported clustered SAN, it is possible
to implement live migrations between different compute nodes in the pool
Immutable Diskless Compute Pool
Background

5. Since all VM volumes are stored remotely, only a small number of files is written to the
operating system root volume (usually configuration files, DHCP leases and libvirt XMLs).
• It’s possible to create an image with all required
software for compute node (nova-compute,
neutron, openvswitch), then boot it via
PXE to RAM and synchronize configurations files
• Use BTRFS in-RAM along with provisioning scripts
• This task is an excellent candidate for automation
using CI and Containers
Immutable Diskless Compute Pool
Solution

6. •Immutable Diskless Pool Demo

7. 1. Setup PXE Server, Key Broker, Jenkins and Dashboard on the master node
2. Add diskless compute nodes to the pool
3. Deploy OpenStack Pike via Ansible and dynamic data source
to Docker Containers across all the nodes from the
Docker private registry, built by CI using Kolla project
4. Create VM on the diskless compute node
5. Emulate the compute node’s failure – switch off
the compute node in the VirtualBox
6. Migrate VMs to another compute node using
CLI and make sure that it works
Immutable Diskless Compute Pool
Showcase

8. • OpenStack controllers in HA
• Neutron gateway
• Clustered Cinder on Ceph
• Jenkins that builds OpenStack Docker
images with the latest security updates
• TFTP and NFS node for serving PXE images
• Key service with Ansible API for RSA key distribution and further configuration
• Diskless pool for nova compute
Immutable Diskless Compute Pool
Architecture

9. • Vendor-neutral IaaS, can use existing open-source or commercial SAN
• Can be built from sources or binary packages
• Better TCO due to better drives utilization
• Faster deployment/upgrade using private image registry and In-RAM provisioning
• Less points of failure because compute pool doesn’t store any significant data
• Instant migrations in case of any failure (nova host-evacuate)
• Secure deployments without internet access, unique RSA fingerprints for each start of node
Immutable Diskless Compute Pool
Advantages Over Disk-Based Deployment

10. •Thank You!