Configuration Variables

ALLOW_ORIGINS

Default:"http://localhost:3000,http://localhost:6688"

Specifies the addresses/URLs of allowed connections to the API on CLIENT_NODE_URL. Input may be a comma-separated (no spaces) list.

CHAINLINK_DEV

Default:"false"

Disables the HTTPS protocol, allowing for unencrypted HTTP connections. It is not recommended to change this setting for production use.

CHAINLINK_PORT

Default:"6688"

Port used for the REST API and GUI.

CLIENT_NODE_URL

Default:"http://localhost:6688"

This is the URL that you will use to interact with the node itself. For example, tasks like adding JobSpecs, External Adapters, and starting jobs with a web initiator will use this URL.

DATABASE_TIMEOUT

Default:"500ms"

If the database file is already in use, the Chainlink node will wait the specified value (with a given time unit) for the database to become available.

ETH_CHAIN_ID

Default:"0"

The Chain ID being 0 allows for the node to work on any available network.

ETH_GAS_BUMP_THRESHOLD

Default:"12"

The number of blocks to wait if the transaction has still not been confirmed before resubmitting the transaction.

ETH_GAS_BUMP_WEI

Default:"5000000000"

The amount of wei to increase for the resubmitted transaction.

ETH_GAS_PRICE_DEFAULT

Default:"20000000000"

The default gas price to use when submitting transactions to the blockchain.

ETH_URL

Default:"ws://localhost:8546"

This is the websocket address of the Ethereum client that the Chainlink node will connect to. All interaction with the Ethereum blockchain will occur through this connection.

LINK_CONTRACT_ADDRESS

Default:"0x514910771AF9Ca656af840dff83E8264EcF986CA"

The address of the LINK token contract. Used for displaying the node account's LINK balance.

Ropsten: 0x20fE562d797A42Dcb3399062AE9546cd06f63280

LOG_LEVEL

Default: "info"

The LOG_LEVEL environment variable determines both what is printed on the screen and what is written to the logfile, located at $ROOT/log.jsonl.

The available options are:

"debug"
"info"
"warn"
"error"
"panic"

MIN_INCOMING_CONFIRMATIONS

Default:"0"

The number of block confirmations to wait before beginning a task run.

MIN_OUTGOING_CONFIRMATIONS

Default:"12"

The number of block confirmations to wait after a task run has been ran to regard it as "completed" in the node.

MINIMUM_CONTRACT_PAYMENT

Default:"1000000000000000000"

For jobs that require payment, this is the minimum payment amount in order for the node to accept and process the job. Since there are no decimals on the EVM, the value is represented like wei. This makes the default value 1 LINK.

ORACLE_CONTRACT_ADDRESS

Default: none

The address of the oracle contract. The Chainlink node will listen to SpecAndRun requests from this address.

ROOT

Default:"~/.chainlink"

This is the directory where the db.bolt and log.jsonl files and the keys directory reside. The db.bolt file is the database that the Chainlink node uses to keep track of JobSpecs, JobRuns, their status according to each interaction, and BridgeTypes (for external adapters). log.jsonl is the log as written by the Chainlink node, depending on the LOG_LEVEL specified by the environment variable's value. The keys directory is the keystore and contains the password-encrypted private keys stored as JSON files.