Resources

Resources in Terraform are the fundamental building blocks for creating, modifying, and managing infrastructure. In Terraform configurations, the resources represent various cloud entities, such as virtual machines, networks, data storages, and other infrastructure components.

In Terraform, resources are described in configuration files using the HCL syntax. These files specify attributes of each resource, such as its type, properties, and dependencies on other resources.

Terraform follows a declarative approach to infrastructure management. This means the user describes the desired end state of the infrastructure, and Terraform automatically takes the necessary steps to achieve that state. The declarative approach simplifies infrastructure management and helps to prevent errors.

Each resource type in Terraform has its own attributes you can set when creating the infrastructure. For example, for the yandex_compute_instance resource, you can specify the platform, disk size, number of cores, and other parameters.

Resources can reference each other, defining their creation and deletion order. For example, the yandex_vpc_subnet resource may depend on the yandex_vpc_network resource. This enables Terraform to automatically create and delete resources in the correct order.

When you update the configuration, Terraform compares the current infrastructure state with the target state and only takes the actions required to achieve the target state. This ensures infrastructure consistency and simplifies its updates.