sponsored by the national science foundation exogeni
TRANSCRIPT
Sponsored by the National Science Foundation
ExoGENI
www.exogeni.net
Sponsored by the National Science Foundation 2www.geni.net
ExoGENI: What is it?
• A collection of ‘racks’ being installed on campuses across US and the world– Core of ExoGENI is built on IBM hardware– Also support Dell and Cisco UCS-B
• Runs ORCA control softaware• Federates with other GENI resources
– Supports common identity mechanisms, APIs and resource descriptions
Sponsored by the National Science Foundation 3www.geni.net
ExoGENI at a glance
Sponsored by the National Science Foundation 4www.geni.net
ExoGENI: why different?
• Designed to bridge distributed experimentation and computational science– Supports sliverable storage for ‘Big(gish) Data’– Supports easy native ‘stitching’ of resources across racks
• Optimized for different design choices– ExoGENI does not support lightweight containers– Only VMs with tightly accounted cores and baremetal nodes for
strong performance isolation• This means even VM slivers are limited. ExoGENI does not
oversubscribe CPU cores!
• Makes few(er) assumptions about experiment behavior or purpose. For example:– IP forwarding is not on by default– No IP address is assigned to dataplane if the RSpec doesn’t
assign it
Sponsored by the National Science Foundation 5www.geni.net
ExoGENI: How Different?
• Based on a different technology stack– Off-the shelf cloud solutions with lightweight orchestration on top– OpenStack for VMs– xCAT for baremetal nodes– ORCA (Open Resource Control Architecture) federation software written
by Duke University and RENCI/UNC Chapel Hill• Provides additional features over native APIs using native tools
– Over time some features migrate back to GENI • Important! Can be thought of as both a
– Collection of separate racks (each rack has GENI AM API point)– Singe aggregate capable of complex topology embedding (So-
called ‘ExoSM’ provides orchestration across racks)
The important thing is your experiment. Decide on what types of resources you need and what features you expect. Decide on the tools,
decide on the resources.
Sponsored by the National Science Foundation 6www.geni.net
ExoGENI: ORCA Control Framework
• ORCA provides orchestration and GENI federation– Exposes GENI AM API and allows the use of RSpec. Allows the use of
GENI tools– Exposes a native API and the use of native resource description
mechanisms. Allows the use of ExoGENI-specific tools.• ORCA provides stitching across ExoGENI aggregates
– Between ExoGENI racks– Includes ‘stitching’ to campus resources, where appropriate
• Provides topology embedding support– Slices can be ‘bound’ to particular racks or ‘unbound’, leaving it up
to ExoSM to decide where to allocate resources– Experimenter can ‘talk’ to individual racks to get resources or get
ExoSM to select the rack • ExoSM can even automatically split some slices between racks
Sponsored by the National Science Foundation 7www.geni.net
Details: Hardware
ExoGENI *
Nodes per rack 10 workers + 1head
Cores per rack 160**
Network interfaces 2x 10Gbit*** with SR-IOV
Storage 150GB+500 GB local + 6 TB SAN
Switches IBM G8264R (Port-based OpenFlow)
* Listed are the specs for ExoGENI IBM-based racks.
** Actual number of available cores varies.
*** Racks deployed at OSF and StarLight will have 40Gbps option
Sponsored by the National Science Foundation 8www.geni.net
Specific Notable Behaviors
• Resource allocation– ExoSM can allocate slices across multiple racks at
once and can stitch them together using NLR, I2 and ESnet
• Images– Bare-metal – just a few available for now– VMs – BYOM (Bring Your Own Image)
• ExoGENI does not host images• Image can be created by experimenter consistent with making
an OpenStack or Eucalyptus image• ExoGENI will download any image from any URL• Images can (to some extent) mix and match kernels, ramdisks
and filesystems
Sponsored by the National Science Foundation 9www.geni.net
ExoGENI VM Image Descriptor Format
<images> <image> <type>ZFILESYSTEM</type> <signature>4faf41957859031b434bb74e1f41f72f87512ec6</signature> <url>http://geni-images.renci.org/images/standard/centos/centos6.3-v1.0.7.tgz</url> </image> <image> <type>KERNEL</type> <signature>bb49676465d6bf01c8bdd688dcdb14bf2f62d7db</signature> <url>http://geni-images.renci.org/images/standard/centos/kernels/vmlinuz-2.6.32-279.14.1.el6.x86_64</url> </image> <image> <type>RAMDISK</type> <signature>bb827d5183fe1aa2c68e7244a5d684f850e33721</signature> <url>http://geni-images.renci.org/images/standard/centos/kernels/initramfs-2.6.32-279.14.1.el6.x86_64.img</url> </image></images>
Sponsored by the National Science Foundation 10www.geni.net
More on ExoGENI VM Images
• Images are specified by tuple <url of metafile, SHA1 hash>
• ‘Vetted’ images are listed with image registry service– http://geni.renci.org:12080/registry/images.jsp– Examples: Ubuntu, Debian, CentOS, OVS, OpenDaylight,
Hadoop, Condor etc– Image marked ‘default’ used on slices that don’t specify an image
• Images are built in a ‘PlayPen’ environment– Stand-alone OpenStack environment suitable for debugging boot
problems
• Snapshotting not currently supported
Sponsored by the National Science Foundation 11www.geni.net
Specific Notable Behaviors (continued)
• Boot scripts– <install> and <execute> services are supported– There is additional type <pbs:services_post_boot_script
type="velocity">• Embedded directly into the RSpec, not loaded separately like
<install> script• Passed through a template engine that does
– Variable substitutions for common slice parameters: node names, slice names, IP, MAC addresses of interfaces etc.
– Has a Turing-complete language for automatic code generation (if/then, for loops, variables)
Sponsored by the National Science Foundation 12www.geni.net
Example Post-Boot scrip template
#!/bin/bashecho $NodeGroup0.get(0).IP("Link0") master >> /etc/hosts#set ( $size = $NodeGroup0.size() - 1 )#foreach ( $i in [1..$size] ) echo $NodeGroup0.get($i).IP("Link0") `echo $NodeGroup0.get($i).Name() | sed 's/\//-/g'` >> /etc/hosts#endname=$self.Name()if [ "$name" = "NodeGroup0/0" ];then echo master > /etc/hostnameelse echo $self.Name() | sed 's/\//-/g' > /etc/hostnamefi/bin/hostname -F /etc/hostname
Sponsored by the National Science Foundation 13www.geni.net
Post-boot script executed by a node
#!/bin/bashecho 172.16.100.1 master >> /etc/hosts
echo 172.16.100.1 `echo NodeGroup0/0 | sed 's/\//-/g'` >> /etc/hostsecho 172.16.100.2 `echo NodeGroup0/1 | sed 's/\//-/g'` >> /etc/hostsecho 172.16.100.3 `echo NodeGroup0/2 | sed 's/\//-/g'` >> /etc/hostsecho 172.16.100.4 `echo NodeGroup0/3 | sed 's/\//-/g'` >> /etc/hosts
name=NodeGroup0/0if [ "$name" = "NodeGroup0/0" ];then echo master > /etc/hostnameelse echo NodeGroup0/0 | sed 's/\//-/g' > /etc/hostnamefi/bin/hostname -F /etc/hostname
Sponsored by the National Science Foundation 14www.geni.net
Specific notable differences continued
• ExoGENI specific-tool: Flukes– Graphical Java tool (cross-platform)– Supports GENI credentials– Speaks to ORCA native API using orca native resource
description mechanisms
• Some features are available only through Flukes– Elastic splittable node groups (dynamically resizable
clusters automatically allocated across multiple racks)– Campus stitching – ability to connect slice to campus
resources using available Layer 2 connectivity– Storage slivering – ability to allocate slivers of storage
and stitch them into your slice
Sponsored by the National Science Foundation 15www.geni.net
Thank You
• More information:– http://wiki.exogeni.net– ExoBlog: http://www.exogeni.net
• Questions from experimenters:– Google group: geni-orca-users