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

Configuring a node

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 a 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 an error when it finds 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.

crlCheckSoftFail

This is a boolean flag that when enabled (i.e. true value is set) the certificate revocation list (CRL) checking will use the soft fail mode. The soft fail mode allows the revocation check to succeed if the revocation status cannot be determined because of a network error. If this parameter is set to false the rigorous CRL checking takes place, meaning that each certificate in the certificate path being checked needs to have the CRL distribution point extension set and pointing to a URL serving a valid CRL.

database

Database configuration:

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

Deprecated. Use h2Settings instead.

h2Settings

Sets the H2 JDBC server host and port. See node-database-access-h2. For non-localhost address the database passowrd needs to be set in dataSourceProperties.

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.

flowTimeout

When a flow implementing the TimedFlow interface does not complete in time, it is restarted from the initial checkpoint. Currently only used for notarisation requests: if a notary replica dies while processing a notarisation request, the client flow eventually times out and gets restarted. On restart the request is resent to a different notary replica in a round-robin fashion (assuming the notary is clustered).

timeout

The initial flow timeout period, e.g. 30 seconds.

maxRestartCount

Maximum number of times the flow will restart before resulting in an error.

backoffBase

The base of the exponential backoff, t_{wait} = timeout * backoffBase^{retryCount}.

rpcAddress

(Deprecated) 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 exposed by the Node.

address

host and port for the RPC server binding.

adminAddress

host and port for the RPC admin binding (this is the endpoint that the node process will connect to).

standAloneBroker

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

useSsl

(optional) boolean, indicates whether or not the node should require clients to use SSL for RPC connections, defaulted to false.

ssl

(mandatory if useSsl=true) SSL settings for the RPC server.

keyStorePath

Absolute path to the key store containing the RPC SSL certificate.

keyStorePassword

Password for the key store.

Note

The RPC SSL certificate is used by RPC clients to authenticate the connection. The Node operator must provide RPC clients with a truststore containing the certificate they can trust. We advise Node operators to not use the P2P keystore for RPC. The node ships with a command line argument "--just-generate-rpc-ssl-settings", which generates a secure keystore and truststore that can be used to secure the RPC connection. You can use this if you have no special requirements.

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.

serviceLegalName

If the node is part of a distributed cluster, specify the legal name of the cluster. At runtime, Corda checks whether this name matches the name of the certificate of the notary cluster.

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 the existing schema, failing on node start if the schema is either not present or not compatible. If no value is specified in the node config file, the node will attempt to detect if it's running on a developer machine and set devMode=true in that case. This value can be overridden from the command line using the --dev-mode option.

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. Cannot be set at the same time as the networkServices option.

networkServices

If the Corda compatibility zone services, both network map and registration (doorman), are not running on the same endpoint and thus have different URLs then this option should be used in place of the compatibilityZoneURL setting.

doormanURL

Root address of the network registration service.

networkMapURL

Root address of the network map service.

Note

Only one of compatibilityZoneURL or networkServices should be used.

devModeOptions

Allows modification of certain devMode features

allowCompatibilityZone

Allows a node configured to operate in development mode to connect to a compatibility zone.

Note

This is an unsupported configuration.

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 = [ '${baseDirectory}/lib' ] (Note that you have to use the baseDirectory substitution value when pointing to a relative path)

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 e.g. sshd { port = 2222 }.

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.

tlsCertCrlDistPoint

CRL distribution point (i.e. URL) for the TLS certificate. Default value is NULL, which indicates no CRL availability for the TLS certificate.

Note

This needs to be set if crlCheckSoftFail is false (i.e. strict CRL checking is on).

tlsCertCrlIssuer

CRL issuer (given in the X500 name format) for the TLS certificate. Default value is NULL, which indicates that the issuer of the TLS certificate is also the issuer of the CRL.

Note

If this parameter is set then tlsCertCrlDistPoint needs to be set as well.

flowMonitorPeriodMillis

Duration of the period suspended flows waiting for IO are logged. Default value is 60 seconds.

flowMonitorSuspensionLoggingThresholdMillis

Threshold Duration suspended flows waiting for IO need to exceed before they are logged. Default value is 60 seconds.

jmxReporterType

Provides an option for registering an alternative JMX reporter. Available options are JOLOKIA and NEW_RELIC. If no value is provided, JOLOKIA will be used.

Note

The Jolokia configuration is provided by default. The New Relic configuration leverages the Dropwizard NewRelicReporter solution. See Introduction to New Relic for Java for details on how to get started and how to install the New Relic Java agent.

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" rpcSettings = { useSsl = false standAloneBroker = false address : "my-corda-node:10003" adminAddress : "my-corda-node:10004" } notary : { validating : false } devMode : false compatibilityZoneURL : "https://cz.corda.net"

Configuring a node where the Corda Compatibility Zone's registration and Network Map services exist on different URLs

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

Fields Override

JVM options or environmental variables prefixed with corda. can override node.conf fields. Provided system properties can also set values for absent fields in node.conf.

This is an example of adding/overriding the keyStore password :

java -Dcorda.rpcSettings.ssl.keyStorePassword=mypassword -jar node.jar

CRL Configuration

The Corda Network provides an endpoint serving an empty certificate revocation list for the TLS-level certificates. This is intended for deployments that do not provide a CRL infrastructure but still require a strict CRL mode checking. In such a case use the following URL in tlsCertCrlDistPoint option configuration:

"https://crl.cordaconnect.org/cordatls.crl"

Together with the above configuration tlsCertCrlIssuer option needs to be set to the following value:

"C=US, L=New York, O=R3 HoldCo LLC, OU=Corda, CN=Corda Root CA"

This set-up ensures that the TLS-level certificates are embedded with the CRL distribution point referencing the CRL issued by R3. In cases where a proprietary CRL infrastructure is provided those values need to be changed accordingly.