corda/docs/source/corda-configuration-file.rst

Node configuration

File location

When starting a node, the corda.jar file defaults to reading the node's configuration from a node.conf file in the directory from which the command to launch Corda is executed. There are two command-line options to override this behaviour:

• The --config-file command line option allows you to specify a configuration file with a different name, or at different file location. Paths are relative to the current working directory
• The --base-directory command line option allows you to specify the node's workspace location. A node.conf configuration file is then expected in the root of this workspace

If you specify both command line arguments at the same time, the node will fail to start.

Format

The Corda configuration file uses the HOCON format which is superset of JSON. Please visit https://github.com/typesafehub/config/blob/master/HOCON.md for further details.

Please do NOT use double quotes (") in configuration keys.

Node setup will log Config files should not contain " in property names. Please fix: [key] as error when it founds double quotes around keys. This prevents configuration errors when mixing keys containing . wrapped with double quotes and without them e.g.: The property "dataSourceProperties.dataSourceClassName" = "val" in reference.conf would be not overwritten by the property dataSourceProperties.dataSourceClassName = "val2" in node.conf.

By default the node will fail to start in presence of unknown property keys. To alter this behaviour, program line argument on-unknown-config-keys can be set to WARN or IGNORE. Default is FAIL if unspecified.

Defaults

A set of default configuration options are loaded from the built-in resource file /node/src/main/resources/reference.conf. This file can be found in the :node gradle module of the Corda repository. Any options you do not specify in your own node.conf file will use these defaults.

Here are the contents of the reference.conf file:

../../node/src/main/resources/reference.conf

Fields

The available config fields are listed below. baseDirectory is available as a substitution value and contains the absolute path to the node's base directory.

myLegalName

The legal identity of the node. This acts as a human-readable alias to the node's public key and can be used with the network map to look up the node's info. This is the name that is used in the node's certificates (either when requesting them from the doorman, or when auto-generating them in dev mode). At runtime, Corda checks whether this name matches the name in the node's certificates.

keyStorePassword

The password to unlock the KeyStore file (<workspace>/certificates/sslkeystore.jks) containing the node certificate and private key.

Note

This is the non-secret value for the development certificates automatically generated during the first node run. Longer term these keys will be managed in secure hardware devices.

trustStorePassword

The password to unlock the Trust store file (<workspace>/certificates/truststore.jks) containing the Corda network root certificate. This is the non-secret value for the development certificates automatically generated during the first node run.

Note

Longer term these keys will be managed in secure hardware devices.

database

Database configuration:

serverNameTablePrefix

Prefix string to apply to all the database tables. The default is no prefix.

transactionIsolationLevel

Transaction isolation level as defined by the TRANSACTION_ constants in java.sql.Connection, but without the "TRANSACTION" prefix. Defaults to REPEATABLE_READ. :exportHibernateJMXStatistics: Whether to export Hibernate JMX statistics (caution: expensive run-time overhead)

dataSourceProperties

This section is used to configure the jdbc connection and database driver used for the nodes persistence. Currently the defaults in /node/src/main/resources/reference.conf are as shown in the first example. This is currently the only configuration that has been tested, although in the future full support for other storage layers will be validated.

h2port

A number that's used to pick the H2 JDBC server port. If not set a randomly chosen port will be used.

messagingServerAddress

The address of the ArtemisMQ broker instance. If not provided the node will run one locally.

p2pAddress

The host and port on which the node is available for protocol operations over ArtemisMQ.

Note

In practice the ArtemisMQ messaging services bind to all local addresses on the specified port. However, note that the host is the included as the advertised entry in the network map. As a result the value listed here must be externally accessible when running nodes across a cluster of machines. If the provided host is unreachable, the node will try to auto-discover its public one.

p2pMessagingRetry

Only used for notarisation requests. When the response doesn't arrive in time, the message is resent to a different notary-replica round-robin in case of clustered notaries.

messageRedeliveryDelay

The initial retry delay, e.g. 30 seconds.

maxRetryCount

How many retries to attempt.

backoffBase

The base of the exponential backoff, t_wait = messageRedeliveryDelay * backoffBase^retryCount.

rpcAddress

The address of the RPC system on which RPC requests can be made to the node. If not provided then the node will run without RPC. This is now deprecated in favour of the rpcSettings block.

rpcSettings

Options for the RPC server.

useSsl

(optional) boolean, indicates whether the node should require clients to use SSL for RPC connections, defaulted to false.

standAloneBroker

(optional) boolean, indicates whether the node will connect to a standalone broker for RPC, defaulted to false.

address

(optional) host and port for the RPC server binding, if any.

adminAddress

(optional) host and port for the RPC admin binding (only required when useSsl is false, because the node connects to Artemis using SSL to ensure admin privileges are not accessible outside the node).

ssl

(optional) SSL settings for the RPC server.

keyStorePassword

password for the key store.

trustStorePassword

password for the trust store.

certificatesDirectory

directory in which the stores will be searched, unless absolute paths are provided.

sslKeystore

absolute path to the ssl key store, defaulted to certificatesDirectory / "sslkeystore.jks".

trustStoreFile

absolute path to the trust store, defaulted to certificatesDirectory / "truststore.jks".

security

Contains various nested fields controlling user authentication/authorization, in particular for RPC accesses. See clientrpc for details.

notary

Optional configuration object which if present configures the node to run as a notary. If part of a Raft or BFT SMaRt cluster then specify raft or bftSMaRt respectively as described below. If a single node notary then omit both.

validating

Boolean to determine whether the notary is a validating or non-validating one.

raft

If part of a distributed Raft cluster specify this config object, with the following settings:

nodeAddress

The host and port to which to bind the embedded Raft server. Note that the Raft cluster uses a separate transport layer for communication that does not integrate with ArtemisMQ messaging services.

clusterAddresses

Must list the addresses of all the members in the cluster. At least one of the members must

be active and be able to communicate with the cluster leader for the node to join the cluster. If empty, a new cluster will be bootstrapped.

bftSMaRt

If part of a distributed BFT-SMaRt cluster specify this config object, with the following settings:

replicaId

The zero-based index of the current replica. All replicas must specify a unique replica id.

clusterAddresses

Must list the addresses of all the members in the cluster. At least one of the members must be active and be able to communicate with the cluster leader for the node to join the cluster. If empty, a new cluster will be bootstrapped.

custom

If true, will load and install a notary service from a CorDapp. See tutorial-custom-notary.

Only one of raft, bftSMaRt or custom configuration values may be specified.

rpcUsers

A list of users who are authorised to access the RPC system. Each user in the list is a config object with the following fields:

username

Username consisting only of word characters (a-z, A-Z, 0-9 and _)

password

The password

permissions

A list of permissions for starting flows via RPC. To give the user the permission to start the flow foo.bar.FlowClass, add the string StartFlow.foo.bar.FlowClass to the list. If the list contains the string ALL, the user can start any flow via RPC. This value is intended for administrator users and for development.

devMode

This flag sets the node to run in development mode. On startup, if the keystore <workspace>/certificates/sslkeystore.jks does not exist, a developer keystore will be used if devMode is true. The node will exit if devMode is false and the keystore does not exist. devMode also turns on background checking of flow checkpoints to shake out any bugs in the checkpointing process. Also, if devMode is true, Hibernate will try to automatically create the schema required by Corda or update an existing schema in the SQL database; if devMode is false, Hibernate will simply validate an existing schema failing on node start if this schema is either not present or not compatible.

detectPublicIp

This flag toggles the auto IP detection behaviour, it is enabled by default. On startup the node will attempt to discover its externally visible IP address first by looking for any public addresses on its network interfaces, and then by sending an IP discovery request to the network map service. Set to false to disable.

compatibilityZoneURL

The root address of Corda compatibility zone network management services, it is used by the Corda node to register with the network and obtain Corda node certificate, (See permissioning for more information.) and also used by the node to obtain network map information.

jvmArgs

An optional list of JVM args, as strings, which replace those inherited from the command line when launching via corda.jar only. e.g. jvmArgs = [ "-Xmx220m", "-Xms220m", "-XX:+UseG1GC" ]

systemProperties

An optional map of additional system properties to be set when launching via corda.jar only. Keys and values of the map should be strings. e.g. systemProperties = { visualvm.display.name = FooBar }

jarDirs

An optional list of file system directories containing JARs to include in the classpath when launching via corda.jar only. Each should be a string. Only the JARs in the directories are added, not the directories themselves. This is useful for including JDBC drivers and the like. e.g. jarDirs = [ 'lib' ]

sshd

If provided, node will start internal SSH server which will provide a management shell. It uses the same credentials and permissions as RPC subsystem. It has one required parameter.

port

The port to start SSH server on

jmxMonitoringHttpPort

If set, will enable JMX metrics reporting via the Jolokia HTTP/JSON agent on the corresponding port. Default Jolokia access url is http://127.0.0.1:port/jolokia/

transactionCacheSizeMegaBytes

Optionally specify how much memory should be used for caching of ledger transactions in memory. Otherwise defaults to 8MB plus 5% of all heap memory above 300MB.

attachmentContentCacheSizeMegaBytes

Optionally specify how much memory should be used to cache attachment contents in memory. Otherwise defaults to 10MB

attachmentCacheBound

Optionally specify how many attachments should be cached locally. Note that this includes only the key and metadata, the content is cached separately and can be loaded lazily. Defaults to 1024.

extraNetworkMapKeys

An optional list of private network map UUIDs. Your node will fetch the public network and private network maps based on these keys. Private network UUID should be provided by network operator and lets you see nodes not visible on public network.

Note

This is temporary feature for onboarding network participants that limits their visibility for privacy reasons.

Examples

General node configuration file for hosting the IRSDemo services:

example-code/src/main/resources/example-node.conf

language

javascript

Simple notary configuration file:

myLegalName : "O=Notary Service,OU=corda,L=London,C=GB" keyStorePassword : "cordacadevpass" trustStorePassword : "trustpass" p2pAddress : "localhost:12345" rpcSettings = { useSsl = false standAloneBroker = false address : "my-corda-node:10003" adminAddress : "my-corda-node:10004" } notary : { validating : false } devMode : true compatibilityZoneURL : "https://cz.corda.net"

An example web-server.conf file is as follow:

myLegalName : "O=Notary Service,OU=corda,L=London,C=GB" keyStorePassword : "cordacadevpass" trustStorePassword : "trustpass" rpcSettings = { useSsl = false standAloneBroker = false address : "my-corda-node:10003" adminAddress : "my-corda-node:10004" } webAddress : "localhost:12347", rpcUsers : [{ username=user1, password=letmein, permissions=[ StartFlow.net.corda.protocols.CashProtocol ] }]

Fields

The available config fields are listed below. baseDirectory is available as a substitution value, containing the absolute path to the node's base directory.

myLegalName

The legal identity of the node acts as a human readable alias to the node's public key and several demos use this to lookup the NodeInfo.

keyStorePassword

The password to unlock the KeyStore file (<workspace>/certificates/sslkeystore.jks) containing the node certificate and private key.

Note

This is the non-secret value for the development certificates automatically generated during the first node run.

Longer term these keys will be managed in secure hardware devices.

trustStorePassword

The password to unlock the Trust store file (<workspace>/certificates/truststore.jks) containing the Corda network root certificate. This is the non-secret value for the development certificates automatically generated during the first node run.

Note

Longer term these keys will be managed in secure hardware devices.

rpcSettings

Options for the RPC server.

useSsl

(optional) boolean, indicates whether the node should require clients to use SSL for RPC connections, defaulted to false.

standAloneBroker

(optional) boolean, indicates whether the node will connect to a standalone broker for RPC, defaulted to false.

address

(optional) host and port for the RPC server binding, if any.

adminAddress

(optional) host and port for the RPC admin binding (only required when useSsl is false, because the node connects to Artemis using SSL to ensure admin privileges are not accessible outside the node).

ssl

(optional) SSL settings for the RPC client.

keyStorePassword

password for the key store.

trustStorePassword

password for the trust store.

certificatesDirectory

directory in which the stores will be searched, unless absolute paths are provided.

sslKeystore

absolute path to the ssl key store, defaulted to certificatesDirectory / "sslkeystore.jks".

trustStoreFile

absolute path to the trust store, defaulted to certificatesDirectory / "truststore.jks".

trustStoreFile

absolute path to the trust store, defaulted to certificatesDirectory / "truststore.jks".

webAddress

The host and port on which the webserver will listen if it is started. This is not used by the node itself.

rpcUsers

A list of users who are authorised to access the RPC system. Each user in the list is a config object with the following fields:

username

Username consisting only of word characters (a-z, A-Z, 0-9 and _)

password

The password

permissions

A list of permissions for starting flows via RPC. To give the user the permission to start the flow foo.bar.FlowClass, add the string StartFlow.foo.bar.FlowClass to the list. If the list

contains the string ALL, the user can start any flow via RPC. This value is intended for administrator users and for development.