AWS Elastic Load Balancing（彈性負載平衡）能自動分配處理多個 Amazon EC2 執行個體的連入應用流量，讓您的應用能獲得容錯能力，全方位提供路由傳送應用流量所需的負載平衡容量。Application Load Balancer（應用負載平衡器）是一款 Elastic Load Balancing（彈性負載平衡）服務可選用的負載平衡工具，並且可在應用層運作。本場專題演講將介紹 Application Load Balancer（應用負載平衡器）、探索 Application Load Balancer（應用負載平衡器）的功能及特色、說明最佳實務，以及協助您上手 Application Load Balancer (應用負載平衡器)

1. © 2016, Amazon Web Services, Inc. or its Affiliates. All rights reserved.
Retro Kuo, Cloud Support Engineer, Premium Support
06/07/2017
使用 AWS 負載平衡服務讓您的應用程式規模化
AWS 快速入門

2. EC2
Instance

3. Load Balancer used to
route incoming requests
to multiple EC2
instances.
ELB
EC2
Instance
EC2
Instance
EC2
Instance

4. Elastic Load Balancing automatically distributes
incoming application traffic across multiple
applications, microservices and containers hosted on
Amazon EC2 instances.

5. SecureElastic Integrated Cost Effective

6. Two Types of Load Balancers

7. Classic Application
Protocol TCP, SSL, HTTP, HTTPS HTTP, HTTPS
Platforms EC2-Classic, EC2-VPC EC2-VPC
Health checks ✔ Improved
CloudWatch metrics ✔ Improved
Content-based routing ✔
WAF support ✔
WebSocket & HTTP/2 ✔

8. EC2 instances
registered behind a
Classic Load Balancer
ELB
EC2
Instance
EC2
Instance
EC2
Instance
Content-Based Routing

9. Running two separate
applications with
Classic Load Balancer
requires multiple load
balancers
ELB
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
ELB
EC2
Instance
orders.example.com
images.example.com

10. ELB
/orders
example.com
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
/images
Application Load
Balancer allows for
multiple applications to
be hosted behind a
single load balancer

11. Native Support HTTP/2, WebSocket, and IPv6

12. Web Application Firewall supports to Application
Load Balancers

13. Content-based routing allows requests to
be routed to different applications behind a
single load balancer
New, feature rich, layer 7 load balancing
platform
Web Application Firewall helps protect your
web applications from common web
exploits
Application Load Balancer

14. My application needs IPv6 to meet the
requirement.
Which load balancer type should I use?

15. My application uses WebSocket.
Which load balancer type should I use?

16. My website is under layer 7 attack.
Which load balancer type should I use?

17. Load Balancer
Listener Listener

18. Define the protocol and port on which the
load balancer listens for incoming
connections
Each load balancer needs at least one
listener to accept incoming traffic, and can
support up to 10 listeners
Routing rules are defined on listeners
Listeners

19. Load Balancer
Listener Listener
Target Group #1
Health Check Health Check Health Check
Target Group #2 Target Group #3

20. Logical grouping of targets
behind a load balancer
Target groups can be exist independently
from the load balancer, and be associated
with a load balancer when needed
Regional construct that can be associated
with Auto Scaling group
Target Groups

21. HTTP and HTTPS health checks
Customize the frequency, failure
thresholds, and list of successful
response codes
Detailed reasons for health check failures
are now returned via the API and
displayed in the Management Console
Health Checks

22. Load Balancer
Target Group #1
Health Check Health Check Health Check
EC2 EC2 EC2 EC2 EC2 EC2 ECS ECS ECS
Listener Listener
Target Group #2 Target Group #3

23. Logical load balancing target, which can be
an EC2 instances, micro-service or
container-based application
EC2 instances can be registered with the
same target group using multiple ports
A single target can be registered with
multiple target groups
Targets

24. Load Balancer
Target Group #1
Health Check Health Check Health Check
EC2 EC2 EC2 EC2 EC2 EC2 ECS ECS ECS
Listener Listener
Target Group #2 Target Group #3
Rule (default) Rule (*/app/*) Rule (default)

25. Provide the link between listeners and
target groups and consist of conditions and
actions
When a request meets the condition of the
rule, the associated action is taken
Today, rules can forward requests to a
specified target group
Rules

26. Conditions can be specified in path pattern and host
format
A condition is case sensitive, can be up to 128
characters in length, and can contain any of the
following characters:
• A-Z, a-z, 0-9
• _ - . $ / ~ " ' @ : +
• & (using &)
• * (matches 0 or more characters)
• ? (matches exactly 1 character)
Rules (continued)

27. Demo

28. Load Balancer
Target Group #1
Health Check Health Check
EC2 EC2
Listener
Rule (default) Rule (/app/*)
Target Group #2

29. What if one back-end instance per target
group does not have enough capacity?

30. Auto Scaling supports the scaling of
applications at the target group level

31. Application Load
Balancer integrates
with Auto Scaling to
manage the scaling of
each target group
independently
ELB
default
example.com
EC2
Instance
EC2
Instance
EC2
Instance
EC2
Instance
/app/
EC2
Instance

32. Demo

33. Load Balancer
Target Group #1
Health Check Health Check
EC2 EC2
Listener
Rule (default) Rule (/app/*)
Target Group #2
Auto Scaling Auto Scaling
EC2

34. Provides several new resource types,
including target groups, targets and rules
Integrate with Auto Scaling group at target
group level
A condition is case sensitive, can be up
to 128 characters in length
Application Load Balancer

35. Always use multiple Availability Zones
Configure the Health Check target to
a static page
Use Auto Scaling group with
Application Load Balancers
Best Practices

36. For TCP/SSL or EC2-Classic, use Classic
Load Balancer; all other use-cases, use
Application Load Balancer

37. Thank you!