GCP Classroom Series 13/Feb/2021

Google VPC (Virtual Private Cloud)

• VPC Provides networking functionality to Virtual Machnes, GKE clusters and App Engine
• VPC can be thought in the same way as Physical Netowrk, except it is virtualized within Google cloud
• VPC is a global resource i.e. it consists of list of regional subnetworks in datacenters, all connected by a Global wan.
• In GCP
  • vpc is a global resource
  • subnet is a regional resource
• While vpc is a gloabl resource, all routes and associated firewall rules are also global.
• All resources created within a vpc can talk to each other using the internal private IP address if you enable private google access to them.
• Subnets are associated with a particular region and in one region we can more than one subnet.
• VPC’s can be created in two modes
  • auto mode:
    • one subnet is automatically created inside each region using predefined IP ranges that fit with in a 10.128.0.0/9 block
  • custom mode: In this mode VPC network, no subnets are created and its up to you create your own subnets and IP ranges that best suits your needs.
• Every project in GCP will have one default VPC
• When creating an vm instance, you selet a zone, a network and subnet
• There are some quotas(can be increased)/limits(cannot be increased) which can be increased by raising a ticket with Google.
  • VPC Networks per project Quota of 5
  • VM instances per network Limit of 7000
• Exercise:
  • Lets Create an auto network in the project
  • Lets create a vpc with range 192.168.0.0/16 and the subnets with 250 devices
    • mumbai
    • central us
  • Lets add one more subnet in east us
• Lets assume a scenario where every day we are asked to create networks for deploying applications, doing this manually doesnot make sense
• Lets try to automate this by using Command line interface Refer Here
• Install google Cloud sdk close all terminals once the installation is successful and relaunch any terminal and type gcloud --version