Raft Docs (#6966)

* Raft configuration doc

* API docs

* join sample

* Fix the Join API

* Add snapshot-force

* Update sys/storage subsection

* Use actual certs in examples

* Add sample configuration response

* Fix link

* remove TLS config options

website/source/docs/configuration/storage/raft.html.md

@@ -0,0 +1,47 @@
+---
+layout: "docs"
+page_title: "Raft - Storage Backends - Configuration"
+sidebar_title: "Raft"
+sidebar_current: "docs-configuration-storage-raft"
+description: |-
+
+ The Raft storage backend is used to persist Vault's data. Unlike all the other
+ storage backends, this backend does not operate from a single source for the
+ data. Instead all the nodes in a Vault cluster will have a replicated copy of
+ the entire data. The data is replicated across the nodes using the Raft
+ Consensus Algorithm.
+
+---
+
+# Raft Storage Backend
+
+The Raft storage backend is used to persist Vault's data. Unlike other storage
+backends, Raft storage does not operate from a single source of data. Instead
+all the nodes in a Vault cluster will have a replicated copy of Vault's data.
+Data gets replicated across the all the nodes via the [Raft Consensus
+Algorithm][raft].
+
+
+- **High Availability** – the Raft storage backend supports high availability.
+
+- **HashiCorp Supported** – the Raft storage backend is officially supported
+  by HashiCorp.
+
+```hcl
+storage "raft" {
+  path = "/path/to/raft/data"
+  node_id = "raft_node_1"
+}
+cluster_addr = "http://127.0.0.1:8201"
+```
+
+**Note:** When using the Raft storage backend, it is required to provide `cluster_addr` to indicate the address and port to be used for communication between the nodes in the Raft cluster.
+
+## `raft` Parameters
+
+- `path` `(string: "")` – The file system path where all the Vault data gets
+  stored.
+
+- `node_id` `(string: "")` - The identifier for the node in the Raft cluster.
+
+[raft]: https://raft.github.io/ "The Raft Consensus Algorithm"