About Private subnet Network
I have two question about private subnet network.
If I make two instance on region'Atlanta, GA', I will be able to communicatte between these instance via Private IP.
And if the other account make an instance on same region, this instance cannot connect my instance via Private IP.
Is it correct?
I think Private networks given to each of the two accounts is different.
If I create two service and I want to restrict private communication between these service without firewall, should I create two accounts?
Yes, you are correct. In the case of Linode VLANS, they are specific to individual accounts and cannot be shared across different accounts. For your latter concern, having the services communicate via separate VLANS should suffice in separating the communications without the need for a firewall.