Internal Load Balancing in 5 mins Deliver scalable and resilient internal-only services on GCP

Google Cloud Load Balancing Global

Regional

HTTP(S) Load Balancing

SSL proxy

Internal TCP/UDP Load Balancing

Network TCP/UDP Load Balancing

Request Routing

Hash-based LB algorithm

Capacity-based LB algorithm

Global Load Balancing

Health Checks

Connection Draining

Autoscaling

Cross-region failover

Affinity

Logging

Monitoring

Cloud CDN

Internal Load Balancing

LB IP: 10.10.10.1

Internal (RFC 1918) Load Balancing

Src IP: 10.10.10.1 Dst IP: 10.10.10.200

Src IP: 10.10.10.1 Dst IP: 10.10.10.200

Client IP preserved

REST API

Client A

X Health checks (TCP, HTTP, HTTPS)

gcloud CLI

Autoscaling (no prewarming)

Console

Backend B

Session Affinity

Internal Load Balancing Example

Subnet 1

Client instances

Subnet 2

Subnet 3

Internal LB IP 10.240.0.200

10.240.0.1

192.168.1.5

10.240.0.2

Zone: us-central1-b

192.168.1.1

Zone: us-central1-a 172.16.1.1

10.240.0.3 Zone: us-central1-c

Network: shopnet Google Cloud Platform US Central region

Logical representation of the ILB, there is no LB instance between client and backend instances

Backends running shopping cart application

Internal Load Balancing is delivered using Andromeda, GCP’s software-defined network virtualization stack

Under the hood: Software-defined load balancing Andromeda

Load Balancers can become choke points

Client instance

......

IP1

There is no load balancer in the path between your client and backend instances

Client instance IP2

Client instance

......

Client instance

IP1

IP2

Virtual Network

VIP

Load Balancer instance(s)

IP3

IP4

Backend

Backend

Internal LB

IP5

......

Backend

Typical Instance-based Internal Load Balancing

VIP

VIP

Backend instance

Backend instance

IP3

IP4

VIP

......

Backend instance IP5

Software-defined Internal Load Balancing on GCP

Configuring Internal Load Balancing (console)

Infrastructure & Operations

6

Internal Load Balancing Configuration Client Instance

Internal LB IP, port configuration

Forwarding Rule

Regional Backend Service

Backend 1

Backend 2

Backend 3

Instance 2

Instance 3

Instance 4

Instance Group 3

Instance 1

Instance Group 2

Instance Group 1

Backend Configuration

Instance 5

Instance 6

Subnet B

Subnet A Region X

1. Click “create load balancer” to get started Click Create

2. Select the type of Internal Load Balancer- either TCP or UDP

Click here for TCP ILB

3. Specify you want to load balance traffic between your instances (internal)

Specify you want internal load balancing

4. Configure backends in your region of choice

Configure backends

Remember to open up firewall for ILB health checks

5. Configure your RFC 1918 Internal LB IP (specify or let ILB auto-allocate)

Configure Internal Load Balancing IP and port (or list of ports)

6. Click “create” and your ILB is ready to distribute traffic!

Click Create. Done!

Internal Load Balancing Use Cases

Infrastructure & Operations

14

ILB Use Case 1: Scaling and HA for internal (micro)services Load balance across multiple instances of your internal service Internal Load Balancer

Internal Load Balancer

Internal Load Balancer

RECOMMEND

SHOPPPING CART

SHOPPPING CART

RECOMMEND

SHOPPING CART

CATALOG

CATALOG

Google Cloud Platform Application composed of ILB-scaled services

ILB Use Case 2: Multi-tier apps

Web Tier

User in San Francisco

External Load Balancing Global: HTTP(S) LB, SSL Proxy Regional: Network TCP/UDP LB

Internal Load Balancing

Web Tier with external load balancing

IP: 10.10.10.10, Port: 80

Internal Load Balancing

Web Tier

Database Tier Internal Tier

Internal Tier

User in Singapore

Internal Tier with Internal Load Balancing

Database Tier

us-central-1b

100.1.1.1, Port: 80

Web Tier

IP: 10.20.1.1, Port: 80 Internal Load Balancing

User in Iowa

us-central-1a

Database Tier Internal Tier asia-east-1a

ILB Use Case 3: Scale-out and HA for virtual appliances

Internal Load Balancer

10.0.0.2

Virtual Appliance Instance 1

10.0.0.3

10.0.0.4

Virtual Appliance Instance 2

Virtual Appliance Instance 3

Google Cloud Platform

Learn more

https://cloud.google.com/compute/docs/load-balancing/internal/

‹#›

Internal Load Balancingin 5 mins Cloud Platform

Deliver scalable and resilient internal-only services on GCP ... Network TCP/UDP ... Subnet 1. Subnet 2. 192.168.1.5. Zone: us-central1-c. Zone: us-central1-b.
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