Problem Statement:

Create a VPC. put 4 subnets into it with 2 private and 2 public in 2 different availability zones add 2 routing tables, 1 public and 1 private and assign to respective subnets. create internet gateway and attach it to public subnet. create NAT gateway attach it to private subnet.

Solution:

VPC – Virtual Private Cloud CIDR block – Classless Inter-Domain Routing -> to specify your VPC’s contiguous IP address range ->for example 10.0.0.0/26 means 2^(32-26) = 2^6 =64,that means we have 64 ip addresses ranging from 10.0.0.0 to 10.0.0.63 ->cannot create VPC larger than 10.0.0.0/16.

subnet-1: name: private-a vpc: vpcid availability zone: us-west-1a CIDR block: 10.0.0.0/28

subnet-2: name: private-c vpc: vpcid availability zone: us-west-1c CIDR block: 10.0.0.16/28

subnet-3: name: public-a vpc: vpcid availability zone: us-west-1a CIDR block: 10.0.0.32/28

subnet-4: name: public-c vpc: vpcid availability zone: us-west-1c CIDR block: 10.0.0.48/28

Route Table: Every VPC has one default route table created which has main attribute as "YES"
Code language: PHP (php)

• name default route table as public-RT -> create a custom route table with name as private-RT ->add private subnets to private-RT route table and public to public-RT ->one subnet can be associated to only one route table
• Internet Gateway: It a an entity which allows connectivity from our vpc to outside internet.
• Add route to public-RT from 0.0.0.0/0 to internetgateway-id,so that public subnet will have access to outside internet.
• NAT Gateway: As private instances have no public ip,NAT gateway provides internet connection to private instances.
• choose one public subnet and create a NAT gateway ->go to private subnet and add route from 0.0.0.0/0 to natgateway-id

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I have worked at Cotocus. I share tech blog at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow , and SEO strategies at Wizbrand.

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