Node configuration ================== .. contents:: 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 ``_ 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: .. literalinclude:: ../../node/src/main/resources/reference.conf :language: javascript .. _corda-configuration-file-fields: 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 (``/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 (``/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_properties_ref: :database: This section is used to configure JDBC and Hibernate related properties: :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) :runMigration: Boolean on whether to run the database migration scripts at startup. Defaults to false. In production please keep it false. For more information please check :doc:`database-management` If migration is not run, on startup, the node will check if it's running on the correct database version. :schema: (optional) some database providers require a schema name when generating DDL and SQL statements. (the value is passed to Hibernate property 'hibernate.default_schema'). :hibernateDialect: (optional) for explicit definition of ``hibernate.dialect`` property, for most cases Hibernate properly detect the correct value :dataSourceProperties: This section is used to configure the jdbc connection and database driver used for the nodes persistence. By default the node starts with an embedded H2 database instance. The configuration defaults in ``/node/src/main/resources/reference.conf`` are as shown in the first example. :ref:`Node database ` contains example configurations for other Database Providers. To add additional data source properties (for a specific JDBC driver settings) use ``dataSource.`` prefix with property name (e.g. `dataSource.customProperty = value`). :dataSourceClassName: JDBC Data Source class name. :dataSource.url: JDBC database URL. :dataSource.user: Database user. :dataSource.password: Database password. :h2port: A number that's used to pick the H2 JDBC server port. If not set a randomly chosen port will be used. For production use you will typically be using a different, non-H2 database backend (e.g. Oracle, SQL Server, Postgres) so this option is intended primarily for developer mode. :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 :doc:`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 :doc:`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 ``/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 :doc:`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). .. note:: The property is available for Corda distributed with Capsule only, for Corda tarball distribution the option is unavailable. It's advisable to copy any required JAR files to the 'drivers' subdirectory of the node base directory. :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 }``. :relay: If provided, the node will attempt to tunnel inbound connections via an external relay. The relay's address will be advertised to the network map service instead of the provided ``p2pAddress``. :relayHost: Hostname of the relay machine :remoteInboundPort: A port on the relay machine that accepts incoming TCP connections. Traffic will be forwarded from this port to the local port specified in ``p2pAddress``. :username: Username for establishing a SSH connection with the relay. :privateKeyFile: Path to the private key file for SSH authentication. The private key must not have a passphrase. :publicKeyFile: Path to the public key file for SSH authentication. :sshPort: Port to be used for SSH connection, default ``22``. :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. :graphiteOptions: Optionally export metrics to a graphite server. When specified, the node will push out all JMX metrics to the specified Graphite server at regular intervals. :server: Server name or ip address of the graphite instance. :port: Port the graphite instance is listening at. :prefix: Optional prefix string to identify metrics from this node, will default to a string made up from Organisation Name and ip address. :sampleIntervallSeconds: optional wait time between pushing metrics. This will default to 60 seconds. :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: If crlCheckSoftFail is FALSE (meaning that there is the strict CRL checking mode) this value needs to be set. :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 the 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``. :enterpriseConfiguration: Allows fine-grained controls of various features only available in the enterprise version of Corda. :tuning: Performance tuning parameters for Corda Enterprise :flowThreadPoolSize: The number of threads available to handle flows in parallel. This is the number of flows that can run in parallel doing something and/or holding resources like database connections. A larger number of flows can be suspended, e.g. waiting for reply from a counterparty. When a response arrives, a suspended flow will be woken up if there are any available threads in the thread pool. Otherwise, a currently active flow must be finished or suspended before the suspended flow can be woken up to handle the event. This can have serious performance implications if the flow thread pool is too small, as a flow cannot be suspended while in a database transaction, or without checkpointing its state first. Corda Enterprise allows the node operators to configure the number of threads the state machine manager can use to execute flows in parallel, allowing more than one flow to be active and/or use resources at the same time. The default value is 2 times the number of cores available which was found to be working efficiently in performance testing. The ideal value for this parameter depends on a number of factors. The main ones are the hardware the node is running on, the performance profile of the flows, and the database instance backing the node as datastore. Every thread will open a database connection, so for n threads, the database system must have at least n+1 connections available. Also, the database must be able to actually cope with the level of parallelism to make the number of threads worthwhile - if using e.g. H2, any number beyond 8 does not add any substantial benefit due to limitations with its internal architecture. For these reasons, the default size for the flow framework thread pool is the minimum between two times the available number of processors and 30. Overriding this value in the configuration allows to specify any number. :rpcThreadPoolSize: The number of threads handling RPC calls - this defines how many RPC requests can be handled in parallel without queueing. The default value is set to the number of available processor cores. Incoming RPC calls are queued until a thread from this pool is available to handle the connection, prepare any required data and start the requested flow. As this might be a non-trivial amount of work, the size of this pool can be configured in Corda Enterprise. On a multicore machine with a large ``flowThreadPoolSize``, this might need to be increased, to avoid flow threads being idle while the payload is being deserialized and the flow invocation run. If there are idling flow threads while rpc calls are queued, it might be worthwhile increasing this number slightly. Valid values for this property are between 4 (that is the number used for the single threaded state machine in open source) and the number of flow threads. Examples -------- General node configuration file for hosting the IRSDemo services: .. literalinclude:: example-code/src/main/resources/example-node.conf Simple notary configuration file: .. parsed-literal:: 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" enterprise : { tuning : { rpcThreadPoolSize = 16 flowThreadPoolSize = 256 } } Configuring a node where the Corda Compatibility Zone's registration and Network Map services exist on different URLs .. literalinclude:: 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 : .. sourcecode:: shell java -Dcorda.rpcSettings.ssl.keyStorePassword=mypassword -jar node.jar