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The terraform state command is used for advanced state management. Rather than modify the state directly, the terraform state commands can be used in many cases instead.

https://www.terraform.io/docs/commands/state/index.html

Vault supports AWS, Azure, Google Cloud, and Alibaba Cloud out of the box for secrets engines

Terraform analyses any expressions within a resource block to find references to other objects and treats those references as implicit ordering requirements when creating, updating, or destroying resources.

https://www.terraform.io/docs/configuration/resources.html

The terraform refresh command is used to reconcile the state Terraform knows about (via its state file) with the real-world infrastructure. This can be used to detect any drift from the last-known state, and to update the state file.

This does not modify infrastructure but does modify the state file. If the state is changed, this may cause changes to occur during the next plan or apply.

https://www.terraform.io/docs/commands/refresh.html

The /sys/leader endpoint is used to check the current leader of Vault as well as high availability status.

The encryption key used to encrypt the plaintext is regarded as a data key. This data key needs to be protected so that your encrypted data cannot be decrypted comfortably by an unauthorized party. In this case, data has been encrypted by specifying the keyring name creditcard.

The current implementation of Terraform import can only import resources into the state. It does not generate a configuration. Because of this, and prior to running terraform import, it is necessary to manually write a resource configuration block for the resource to which the imported object will be mapped.

First, add the resources to the configuration file:

resource "aws_instance" "example" {

# ...instance configuration...

}

Then run the following command:

$ terraform import aws_instance.example i-abcd1234

If using ACLs in Consul, you'll need appropriate permissions. For Consul 0.8, these policies will work for most use-cases, assuming that your service name is vault and the prefix being used is vault/Consul ACLs should always be enabled when using Consul as a storage backend. This policy allows Vault to communicate to the required services hosted on Consul.

Reference link:- https://www.vaultproject.io/docs/configuration/storage/consul

See this page on the purpose of Terraform state and the benefits it provides.

The plugin directory is a configuration option of Vault, and can be specified in the configuration file. This setting specifies a directory in which all plugin binaries must live; this value cannot be a symbolic link. A plugin can not be added to Vault unless it exists in the plugin directory. There is no default for this configuration option, and if it is not set plugins can not be added to Vault.

Reference link:- https://www.vaultproject.io/docs/internals/plugins