---
title: "Environment variables"
url: "/docs/block-builders/run-a-builder/install-and-run-a-node/environment-variables/index.md"
description: "Configuration reference for all environment variables used by the Signet node client."
---
# Environment Variables

The following environment variables can be used to configure various aspects of the `signet` node client.

| Environment Variable   | Required                                           | Description                                                                 |
| ---------------------- | -------------------------------------------------- | --------------------------------------------------------------------------- |
| `BLOB_EXPLORER_URL`    | **Required**
  | URL of a blob explorer                                                      |
| `SIGNET_STATIC_PATH`   | **Required**
  | Filesystem path to where the static_files directory should be located       |
| `SIGNET_DATABASE_PATH` | **Required**
  | Filesystem path to where the node should store its database                 |
| `IPC_ENDPOINT`         | **Optional**
 | Filesystem path for the .ipc file                                           |
| `GENESIS_JSON_PATH`    | **Required**
  | Path on the filesystem for the genesis file                                 |
| `RPC_PORT`             | **Required**
  | Port to be used for the rollup node http json-rpc requests                  |
| `WS_RPC_PORT`          | **Required**
  | Port to be used for the rollup node's WebSocket connections                 |
| `TX_FORWARD_URL`       | **Optional**
 | URL for the transaction cache API                                           |
| `SIGNET_CL_URL`        | **Optional**
 | URL to the consensus layer for fetching blobs and other CL responsibilities |
| `SIGNET_PYLON_URL`     | **Optional**
 | URL to the Pylon node for blob storage                                      |
| `HOST_START_TIMESTAMP` | **Required**
  | The host chain's start timestamp for slot calculation purposes              |
| `HOST_SLOT_OFFSET`     | **Required**
  | The host chain's slot offset                                                |
| `HOST_SLOT_DURATION`   | **Required**
  | The host chain's slot duration                                              |
| `RUST_LOG`             | **Optional**
 | Standard rust environment variable for logging                              |