Create two  virtual private Cloud.
vpc-1:
    Here i create one vpc name is vpc-mridul-api
    subnet-name is subent-api
    local-name is us-west1
    ipv4-address is 10.105.0.0/24
    click all the firewall rules [as this for pratice]
vpc-2:
    Here i create one vpc name is vpc-mridul-db
    subnet-name is subent-db
    local-name is us-west3
    ipv4-address is 10.0.0.0/24
    click all the firewall rules [as this for pratice]

Create two virtual machines inside the virtual private Cloud.
vm-1:
    given the name of vm-mridul-api
    select the location as given vpc 
    Machine configuration - E2 (built in)
    allowed all Firewall rules [http/https]
    when selecting the subent click on default subnet and then select the vpc- mridul-api for vm-mridul-api
    Everything as default
vm-2:
    given the name of vm-mridul-db
    select the location as given vpc 
    Machine configuration - E2 (built in)
    allowed all Firewall rules [http/https]
    when selecting the subent click on default subnet and then select the vpc- mridul-db for vm-mridul-db
    Everything as default

create connection for communication vpc-mridul-api to vpc-mridul-db

after all process done go to the code.sh file cheak that connection are successful work or not.