implicit dependency does not have any keyword but it can be noticed by giving reference to another elements
//implicit dependency via referencing objects vpc_security_group_ids = [aws_security_group.general.id]
depends_on keyword help us to activate explicit dependency
resource "aws_instance" "my_server_web" { ami = "ami-0bd39c806c2335b95" instance_type = "t3.micro" vpc_security_group_ids = [aws_security_group.general.id] tags = { Name = "Server-Web" } depends_on = [ aws_instance.my_server_db, aws_instance.my_server_app ] } resource "aws_instance" "my_server_app" { ami = "ami-0bd39c806c2335b95" instance_type = "t3.micro" vpc_security_group_ids = [aws_security_group.general.id] tags = { Name = "Server-App" } depends_on = [aws_instance.my_server_db] } resource "aws_instance" "my_server_db" { ami = "ami-0bd39c806c2335b95" instance_type = "t3.micro" vpc_security_group_ids = [aws_security_group.general.id] tags = { Name = "Server-DB" } }