What is Cloud computing?
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Cloud computing provides on-demand access to computing resources like storage, networking, and servers that can be rapidly provisioned without long wait times. There are public clouds run by third parties and private clouds within a company's own data center. Public clouds offer elastic resources without large upfront costs but less control, while private clouds offer more control within existing infrastructure limitations. Major cloud providers like Amazon Web Services offer infrastructure as a service (IaaS) like computing and storage, and platform as a service (PaaS) that automates services like databases.
What is Cloud computing?
- 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
- 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/
- 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)
- 22. Use Cases
- 23. Use Cases
- 24. Use Cases