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

Node configuration

File location

The Corda all-in-one corda.jar file is generated by the gradle buildCordaJAR task and defaults to reading configuration from a node.conf file in the present working directory. This behaviour can be overidden using the --config-file command line option to target configuration files with different names, or different file location (relative paths are relative to the current working directory). Also, the --base-directory command line option alters the Corda node workspace location and if specified a node.conf configuration file is then expected in the root of the workspace.

The configuration file templates used for the gradle deployNodes task are to be found in the /config/dev folder. Also note that there is a basic set of defaults loaded from the built in resource file /node/src/main/resources/reference.conf of the :node gradle module. All properties in this can be overidden in the file configuration and for rarely changed properties this defaulting allows the property to be excluded from the configuration file.

Format

The Corda configuration file uses the HOCON format which is superset of JSON. It has several features which makes it very useful as a configuration format. Please visit their page for further details.

Examples

General node configuration file for hosting the IRSDemo services.

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

Simple Notary configuration file.

myLegalName : "O=Notary Service,OU=corda,L=London,C=GB" keyStorePassword : "cordacadevpass" trustStorePassword : "trustpass" p2pAddress : "localhost:12345" rpcAddress : "localhost:12346" webAddress : "localhost:12347" notary : { validating : false } devMode : true compatibilityZoneURL : "https://cz.corda.net"

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.

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.

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 NetworkMapService. 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.

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.

security

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

webAddress

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

Note

If HTTPS is enabled then the browser security checks will require that the accessing url host name is one of either the machine name, fully qualified machine name, or server IP address to line up with the Subject Alternative Names contained within the development certificates. This is addition to requiring the /config/dev/corda_dev_ca.cer root certificate be installed as a Trusted CA.

Note

The driver will not automatically create a webserver instance, but the Cordformation will. If this field is present the web server will start.

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

exportJMXTo

If set to http, will enable JMX metrics reporting via the Jolokia HTTP/JSON agent. Default Jolokia access url is http://127.0.0.1:7005/jolokia/

useAMQPBridges

Optionally can be set to false to use Artemis CORE Bridges for peer-to-peer communications. Otherwise, defaults to true and the AMQP 1.0 protocol will be used for message transfer between nodes.

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.