Add information to enable the Engine API. (#1199)

Signed-off-by: bgravenorst <byron.gravenorst@consensys.net>

Signed-off-by: bgravenorst <byron.gravenorst@consensys.net>

docs/public-networks/get-started/connect/mainnet.md

@@ -51,6 +51,7 @@ besu \
   --rpc-ws-host=0.0.0.0        \
   --host-allowlist=<IP of Besu node>,127.0.0.1,localhost        \
   --engine-host-allowlist=<IP of Besu node>,127.0.0.1,localhost \
+  --engine-rpc-enabled        \
   --engine-jwt-secret=<path to jwtsecret.hex>
 ```
 
@@ -74,6 +75,8 @@ Also, in the command:
   service.
 - [`--rpc-ws-host`](../../reference/cli/options.md#rpc-ws-host) is set to `0.0.0.0` to allow remote
   RPC connections.
+- [`--engine-rpc-enabled`](../../reference/cli/options.md#engine-rpc-enabled) enables the
+    [Engine API](../../reference/engine-api/index.md).
 
 You can modify the option values and add other [command line options](../../reference/cli/options.md)
 as needed.

docs/public-networks/get-started/connect/testnet.md

@@ -54,6 +54,7 @@ Run the following command or specify the options in a
       --rpc-ws-host=0.0.0.0       \
       --host-allowlist="*"        \
       --engine-host-allowlist="*" \
+      --engine-rpc-enabled        \
       --engine-jwt-secret=<path to jwtsecret.hex>
     ```
 
@@ -69,6 +70,7 @@ Run the following command or specify the options in a
       --rpc-ws-host=0.0.0.0       \
       --host-allowlist="*"        \
       --engine-host-allowlist="*" \
+      --engine-rpc-enabled        \
       --engine-jwt-secret=<path to jwtsecret.hex>
     ```
 

docs/public-networks/how-to/use-engine-api.md

@@ -12,6 +12,7 @@ These API methods are a separate subsection of the [JSON-RPC API](../how-to/use-
 
 To configure the Engine API:
 
+- [Enable the Engine API](#enable-the-engine-api) (it's disabled by default).
 - [Enable the JSON-RPC API](use-besu-api/index.md#enable-api-access).
   Ensure the [`ETH` method is enabled](use-besu-api/json-rpc.md#api-methods-enabled-by-default) (it's enabled by default).
 - Specify the [service ports](#service-ports).
@@ -20,9 +21,18 @@ To configure the Engine API:
 !!! example "Example Engine API configuration"
 
     ```bash
-    besu --rpc-http-enabled --engine-rpc-port=8551 --engine-host-allowlist=localhost,127.0.0.1 --engine-jwt-secret=jwt.hex
+    besu --engine-rpc-enabled --rpc-http-enabled --engine-rpc-port=8551 --engine-host-allowlist=localhost,127.0.0.1 --engine-jwt-secret=jwt.hex
     ```
 
+### Enable the Engine API
+
+Enable the Engine API with the [`--engine-rpc-enabled`](../reference/cli/options.md#engine-rpc-enabled) CLI option.
+
+!!! note
+
+    The `--engine-rpc-enabled` CLI option enables the Engine API even if no consensus client
+    configuration exists.
+
 ### Service ports
 
 To specify the port the Engine API service listens on for HTTP and WebSocket, use the

docs/public-networks/reference/cli/options.md

@@ -580,6 +580,35 @@ Contents of file must be at least 32 hex-encoded bytes and not begin with `0x`.
 May be a relative or absolute path.
 See an [example of how to generate this](../../get-started/connect/mainnet.md#1-generate-the-shared-secret).
 
+### `engine-rpc-enabled`
+
+=== "Syntax"
+
+    ```bash
+    --engine-rpc-enabled[=<true|false]>
+    ```
+
+=== "Example"
+
+    ```bash
+    --engine-rpc-enabled
+    ```
+
+=== "Environment variable"
+
+    ```bash
+    BESU_ENGINE_RPC_ENABLED=true
+    ```
+
+=== "Configuration file"
+
+    ```bash
+    engine-rpc-enabled=true
+    ```
+
+Enables or disables the [Engine API](../engine-api/index.md).
+The default is `false`.
+
 ### `engine-rpc-port`
 
 === "Syntax"

docs/public-networks/reference/engine-api/index.md

@@ -9,6 +9,10 @@ communicate with each other using the Engine API.
 When running Besu as an execution client, [use these API calls](../../how-to/use-engine-api.md) to
 communicate with a consensus client.
 
+!!! important
+
+    Ensure you enable the Engine API methods with the [`--engine-rpc-enabled`](../cli/options.md#engine-rpc-enabled) CLI option.
+
 See the [Ethereum Engine API specification](https://github.com/ethereum/execution-apis/blob/0b965fb714ccd3faa3c939fdce1726e56679cdec/src/engine/specification.md) for more information.
 
 ## Methods

docs/public-networks/tutorials/besu-teku-mainnet.md

@@ -44,6 +44,7 @@ besu \
   --rpc-ws-host="0.0.0.0"      \
   --host-allowlist=<IP of Besu node>,127.0.0.1,localhost        \
   --engine-host-allowlist=<IP of Besu node>,127.0.0.1,localhost \
+  --engine-rpc-enabled         \
   --engine-jwt-secret=<path to jwtsecret.hex>
 ```
 
@@ -66,6 +67,8 @@ Also, in the command:
   service.
 - [`--rpc-ws-host`](../reference/cli/options.md#rpc-ws-host) is set to `0.0.0.0` to allow remote RPC
   connections.
+- [`--engine-rpc-enabled`](../reference/cli/options.md#engine-rpc-enabled) enables the
+    [Engine API](../reference/engine-api/index.md).
 
 You can modify the option values and add other [command line options](../reference/cli/options.md)
 as needed.

docs/public-networks/tutorials/besu-teku-testnet.md

@@ -54,6 +54,7 @@ Run the following command or specify the options in a [configuration file](../ho
       --rpc-ws-host=0.0.0.0       \
       --host-allowlist="*"        \
       --engine-host-allowlist="*" \
+      --engine-rpc-enabled        \
       --engine-jwt-secret=<path to jwtsecret.hex>
     ```
 
@@ -69,6 +70,7 @@ Run the following command or specify the options in a [configuration file](../ho
       --rpc-ws-host=0.0.0.0       \
       --host-allowlist="*"        \
       --engine-host-allowlist="*" \
+      --engine-rpc-enabled        \
       --engine-jwt-secret=<path to jwtsecret.hex>
     ```