Introduction Slides, discussing public and private clouds benefits vs traditional data centres

1. What Is Cloud Computing?
Public and Private Clouds

2. A Simple Definition
At a basic level Cloud Computing is a collection of:
• Compute
• Storage
• Networking
Resources that can be consumed on demand.

3. Public and Private
• Public Clouds allow you to consume resource that’s
managed by a third party
• Private Clouds allow you to better allocate resource in
your own data centre
• Both provide Networking, Compute and Storage
Resources

4. Cloud vs Traditional DC
Cloud
Advantages
• Flexible Infrastructure
– Quick to provision
• “On demand” servers
– Power on/off as you need
• Pay as you go service
– Public cloud only
Disadvantages
• Lack of physical access
Traditional Data Centres
Advantages
• Complete Control
Disadvantages
• Wasted Resources
• Long lead times for new
equipment
• Always on Infrastructure

5. Problems With Scale
Cloud provides us with a method of allocating the resources we need, without the risk
of wastage. Public cloud allows us to consume resources with a greater elasticity
than a Traditional DC or Private Cloud and an ability to handle high demand without
crashing our systems without a large upfront investment.

6. Problems in a Traditional DC
• You need to plan capacity carefully
• Often an unknown quantity
• Best guess
• Finite resource
• Limited ability to burst
• Wasted resource

7. Cloud Advantages
Public Clouds
• Better Allocation of resources
• Flexible Environments
• Lower Capital Expenditure
– No upfront costs
• Business Continuity
– Built in redundancy
• Easier and Automatic Upgrades
• Massive Scale
• Accredited Security Standards
(ISO)
Private Clouds
• Better Allocation of resources
• Flexible Environments
• Your own Data Centre can be
repurposed
• Complete control over your
systems and facilities
• The big problem with private cloud
is you are still limited by your own
hardware

8. Why Public Cloud Makes Sense
• No upfront investment / Low cost to entry
• Virtually limitless storage, compute and
networking capability
• No long lead times to provision servers
• Pay as you go (no wasted spend on IT resource)
• Excellent security standards (ISO)
• Value added services delivered by PaaS
offerings

9. Major Players
Public Clouds Private Clouds

10. Market Leaders
As of May 2014 Gartner
Placed AWS as the market
leader
However its always been
the leader!

11. AWS Products
IaaS
• EC2 (compute)
• VPC, Direct Connect (networking)
• S3, Glacier (storage)
PaaS
• RDS (databases)
– MySQL, MSSQL, Postgres,
Oracle
• Application Services
– SES, SQS, Cloud Search,
Elastic Transcode
• Analytics
– Elastic Map Reduce
• Enterprise Applications
– Workspaces, Zocalo
• Many Many More

12. Amazon Web Services

13. Why Choose IaaS?
• Complete control of environment
– Allows you to customise the settings for your
use case
• Full access to the underlying systems
– Use existing tools
• Ability to use custom software stacks
– In house or bespoke software

14. Why Choose PaaS?
• Very quick to provision a fully functional
service (DB, Email, File Storage, etc, etc)
– Minimal configuration
• Reduce management overhead for IT staff
– Automated updates
– Automated backup and recovery
• Highly available at a fraction of the cost
• Tried and tested

15. Monitoring and Logging
• CloudWatch
– System Level Monitoring by default
– Custom Metric Support for specialist
monitoring
• CloudTrail
– An audit trail of console and programmatic
access to AWS
– Ability to push EC2 logs to storage

16. CloudWatch
Monitoring for AWS Resources
• Hypervisor level metrics
• CPU
• Disk IO
• Network Traffic
• Elastic Load Balancer Stats
• Backend Connections
• Backend Errors
• Latency
• Elastic Block Storage
• More detailed disk IO
Alarms
• Can be used to trigger autoscale events
• Adding EC2 resource
• Removing EC2 resource when no longer
needed
Custom Metrics
• Application level metrics
• Memory usage
• Disk Space
• Apache/Nginx connections
• Anything you can script
• Metric Sample Rates
• Standard is 5 min average (no cost)
• Advanced is 1 min average (extra cost)
Resources
• Statsd: https://github.com/camitz/aws-cloudwatch-
statsd-backend
• Nginx:
https://github.com/newsapps/awsmonitors
• More info: http://aws.amazon.com/cloudwatch/

17. CloudWatch DashBoard

18. Network Security
• VPC (Virtual Private Cloud)
– Your own network within amazon
• Define your own subnets
– Access Controls
• Security Groups (software firewall)
• NACLs (network access control lists)
– External Access
• Direct Connect
• VPN (Virtual Private network)
• Public Subnets (Elastic IP’s)

19. Data Security
• AWS provides a key management service
• EBS Encrypted Volumes
– Automatically encrypted at rest
• Do it yourself!
– Use encryption within EC2 on EBS voumes
• S3 encryption
– Server side encryption

20. User Security
• IAM (Identity Access management)
– Controls on a per user basis access to
services
– Granular control of services
– Logs via CloudTrail
– Supports MFA (multifactor authentication)

21. Security Accreditations

22. Use Cases

23. Use Cases

24. Use Cases