This document provides an overview of load balancers in Google Cloud Platform. It discusses managed and unmanaged instance groups, the need for load balancers, and the different types of load balancers including global, regional, external, and internal. It also covers HTTP(S) load balancers and concepts like URL maps and backend services that are used to distribute traffic.

1. Google Cloud
Platform
Chapter 2

2. Overview of
Chapter 2
PREVIEW OF CHAPTER
1
MANAGED AND
UNMANAGED IGS
NEED OF
LOADBALANCERS
CHOOSING THE RIGHT
LOADBALANCER
TYPES OF
LOADBALANCERS
DEMO ON HTTP(S)
LOAD BALANCERS

3. Services covered in
Chapter 1
• IAM role
(member,role,policies)
• Storage
• VPC
• Compute Engine
• Launching instance
• Instance template

4. Instance Group
• Features of IGs
• Autoscaling
• Autohealing
• Managed IGs
• Unmanaged IGs

5. Unmanaged IGs
Can be used for grouping of
already running instances
Do not offer Autoscaling and
Autohealing
Not recommended

6. Managed IGs
Use an Instance template
Supports Autoscaling and
Autohealing

7. Need of Loadbalancers

9. Choosing the right loadbalancer
• Global Loadbalancing
• Regional Loadbalancing
Geographical
Location of
Users
• External Loadbalancing
• Internal Loadbalancing
User lies
Inside the Gcp
or Outside the
Gcp

10. Types of
Loadbalancers
• Used for globally distributed users
• Ipv4 and Ipv6 termination
Global Loadbalancers
• Used for instances and users concentrated in one
region
• Only Ipv4 termination
Regional Loadbalancers
External Loadbalancers
Internal Loadbalancers

11. Structural
representation of LBs

12. Thumb Rule:
Always try to
go with LB in
the highest
layer possible

13. HTTP(s) Load
Balancing
Used for external facing traffic
Global in nature
Works at application layer in OSI stack
Distributed traffic among IGs
Need of global forwording rule

15. Concepts
• Set of key-value pair
• Key : Urls
• Value: Backend Services
Url Map
• Directs request to backend capacity
• Depends on health checks
Backend Services
• Based on CPU utilization
• Request per instance
Traffic distribution to backend

16. SSL Proxy
LoadBalancer
Operates in session layer
Use only for non-Http(s) SSL traffic
User connects using SSl
Load balancers forward a connection with
backend instance

18. Demo on Http
Loadbalancer

20. Thank You