This document discusses Kakaocorp's transition from an unmanned datacenter to using algorithms and OpenStack for resource management. It describes the development of an integrated monitoring system called "Crow" to gather metrics from physical and virtual resources. This system analyzes resource usage to identify unused virtual machines, allowing Kakaocorp to automatically garbage collect over 40% of potential candidates. The monitoring data also helps create a new controlled volume subsystem for improved resource allocation.

1. Kakaocorp
From unmanned Datacenter
To Algorithmic Economy using
Openstack
Andrew Yongjoon Kong
andrew.kong@kakaocorp.com
LTHlab

2. KakaocorpAndrew. Yongjoon kong
• Cloud Technical Advisory for Government Broad Cast Agency
• Adjunct Prof. Ajou Univ
• Korea Data Base Agency Acting Professor for Bigdata
• Member of National Information Agency Bigdata Advisory committee
• KT cloudware Tech lead(ex)!
• Kakao à Daum Kakao à Kakaocorp, Cloud Computing Cell lead
Supervised,
Korean
edition
Korean Edition
coming soon.

3. KakaocorpOur vision.

4. KakaocorpOur culture.
Trust, Conflicts, Commitment

5. KakaocorpWhat is Cloud?
From Our Side
• Cloud == “Programmable Resource Management”
• What is Programmable?
• What is Resource?
• What is Management?
• NOP!
• Cloud is the one of the ways of managing/deploying
resources
• Basically, It’s culture.
• Tech. can support this culture
• Our culture is “Automation”

6. KakaocorpSome Numbers
5xxx VMs is running.
We revealed this already last Feb. in Openstack Community Days, Korea

7. KakaocorpSome Numbers
964 tenants
455 pull request since 2014.9
136 VMs are created/deleted per day

8. KakaocorpSome information about kakaoOpenstack
openstack release from grizzly to Kilo
total 3Region
additional service Heat/Trove/Sahara

9. KakaocorpUnmanned Data Center
Self Managed Computational Resource - Krane
• No Dedicated human resource in Front Desk
for getting order
• 24 x 7 API is open ( try to )
• Using Openstack API is Users Job.
• Maintaining Openstack Cloud is Our Job.
• We do not control anything at all.

10. KakaocorpSuccess or Issue?
Unit is “krane[virtual money]”.
Just for fun, not actually charged.
Fromonly one region.

11. KakaocorpCritical Volume vs Controlled Volume
When One thing is
over Critical Volume,
Have to change the point of view!

12. KakaocorpCloud, We do adopt devops culture : KField

13. KakaocorpControlled volume
Genesis:
- Krane was based on “left over or warranty-
outed resources”
- Some hypervisor(not vm) has only 16G.
- Interconnect was only 1G
- It’s for only “dev” stage service.
Exodus:
- more than 128GB
- 10Gbps
- SSD
It needs to have control
The easiest way:
- Making quota like everyone does.

14. KakaocorpCloud, we do have SDN, have No Openflow, No L2 network either

15. KakaocorpCloud, we do have SDN, not have Openflow, No others
eth0
Compute node
nova-compute
neutron-
linuxbridge-
agent
neutron-dhcp-
agent
Gateway
10.10.100.1
linux bridge
vm
IP:10.10.100.2/32
Routing Table
1 10.100.10.2/32 via 192.1.1.201
BGP
192.1.1.202 BGP
Virtual Switch block
Process block
Neutron-l3-agent
vlan
vlan
Virtual Router
Service Route Table
1
Management Route Table
1
Practice Frugality to Boost Creativity

16. KakaocorpWhy we want to rethink about quota
The thing which doesn’t exist in kakao is:
• No live migration
• No H/A in computed node
• No mirror in system disk
• No bonding for compute node network
• No extra interface for service and storage
à Technically, No extra something for failure
à What if server goes? software will take care of it.
à We recommend user to be ready for some failure.
à We do have LB ,volume and object storage for stability

17. KakaocorpCulture: Trust
We do understand our developer
is on harsh environment.
And adding Quota to this, make
developer more stressful.

18. KakaocorpCulture2: Commitment
So, We want our user to have the freedom
of creating resource.
But, We want our user to have the
responsibility of deleting unused resource
too.
We understand this is quite tedious job
So, we decide to find unused VM instead

19. KakaocorpSimple, Difficult at the same time
It looks simple, but quite difficult to define
what “unusedvs low usage”resource is.

20. KakaocorpThe initial the DC scale Garbage Collection
Anyway, somehow, we have to define some guide linesfor unused resources.
And Should be Done in Algorithmic way.
CPU
Load
Traffic
login
IO
Top
process
Analysis Noti.
Every Resource Data model

21. KakaocorpUnified Data System
First of all, unified metric store/retrieve system needed to detect certain levels
of computing resources.
• Have to gather/retrieve unified way
• Have to cover all resources from physical machine to virtual machine and
network switches.
• Have to interface with Configuration Managing Database
• Have to interface with internal ERP

22. KakaocorpIntegratedInformation Service Bus & EIP : Code Name Crow
Based on Opensource
Component
• Kafka
• Samza
• Camel
• Storm
• Gobblin
• Yarn
• HDFS
• Etcd
• OpenTSDB
• Hbase
• Tajo
• Grafana

23. KakaocorpIntegratedInformation Service Bus & EIP : Code Name Crow
Enterprise Integration
• Topic based Data ETL
• Can cover every computing
resource ( Physical Server,
Virtual instance, Container,
Public Cloud )
• Abstracting “Data Center
Information layer”
• Can make deep engineering
experience over every
resources.
Physical
Servers
Virtual
Instances
Containers
External
Clouds
Others
(switches,
logs)
monitoring
CROW
IMS
(kakao CMDB
API)
SB
Rule
Engine
Notificati
on
ETL
Data Center Information abstraction layer
API
predicting
scheduling
Openstack
Heat
Other
Service
API
Data Center (or Service ) Management Activity
control

24. KakaocorpResult
Start up with finding unused Resources
– We created unified monitoring system
– can replace pre-existed system monitoring system
– can extract/analyze more information
– End up with creating brand new resource information center
We try to target 10% as a potential candidate.
More than 40% of them was the real “abandoned vm”
because of structural changes ( I mean not purposely left)

25. KakaocorpResult: Add another controlled volume subsystem

26. KakaocorpQ&A
Q&AP.S. We’re hiring, always!
http://www.kakaocorp.com/recruit