neo-go/docs/node-configuration.md

NeoGo node configuration file

This section contains detailed NeoGo node configuration file description including default config values and some tips to set up configurable values.

Each config file contains two sections. ApplicationConfiguration describes node-related settings and ProtocolConfiguration contains protocol-related settings. See the Application Configuration and Protocol Configuration sections for details on configurable values.

Application Configuration

ApplicationConfiguration section of yaml node configuration file contains node-related settings described in the table below.

Section	Type	Default value	Description
Address	string	0.0.0.0	Node address that P2P protocol handler binds to.
AnnouncedPort	uint16	Same as NodePort	Node port which should be used to announce node's port on P2P layer, it can differ from the NodePort the node is bound to (for example, if your node is behind NAT).
AttemptConnPeers	int	20	Number of connection to try to establish when the connection count drops below the MinPeers value.
BroadcastFactor	int	0	Multiplier that is used to determine the number of optimal gossip fan-out peer number for broadcasted messages (0-100). By default it's zero, node uses the most optimized value depending on the estimated network size (2.5×log(size)), so the node may have 20 peers and calculate that it needs to broadcast messages to just 10 of them. With BroadcastFactor set to 100 it will always send messages to all peers, any value in-between 0 and 100 is used for weighted calculation, for example if it's 30 then 13 neighbors will be used in the previous case.
DBConfiguration	DB Configuration		Describes configuration for database. See the DB Configuration section for details.
DialTimeout	int64	0	Maximum duration a single dial may take in seconds.
ExtensiblePoolSize	int	20	Maximum amount of the extensible payloads from a single sender stored in a local pool.
LogPath	string	"", so only console logging	File path where to store node logs.
MaxPeers	int	100	Maximum numbers of peers that can be connected to the server.
MinPeers	int	5	Minimum number of peers for normal operation; when the node has less than this number of peers it tries to connect with some new ones.
NodePort	uint16	0, which is any free port	The actual node port it is bound to.
Oracle	Oracle Configuration		Oracle module configuration. See the Oracle Configuration section for details.
P2PNotary	P2P Notary Configuration		P2P Notary module configuration. See the P2P Notary Configuration section for details.
PingInterval	int64	30	Interval in seconds used in pinging mechanism for syncing blocks.
PingTimeout	int64	90	Time to wait for pong (response for sent ping request).
Pprof	Metrics Services Configuration		Configuration for pprof service (profiling statistics gathering). See the Metrics Services Configuration section for details.
Prometheus	Metrics Services Configuration		Configuration for Prometheus (monitoring system). See the Metrics Services Configuration section for details
ProtoTickInterval	int64	5	Duration in seconds between protocol ticks with each connected peer.
Relay	bool	true	Determines whether the server is forwarding its inventory.
RPC	RPC Configuration		Describes RPC subsystem configuration. See the RPC Configuration for details.
StateRoot	State Root Configuration		State root module configuration. See the State Root Configuration section for details.
UnlockWallet	Unlock Wallet Configuration		Node wallet configuration used for consensus (dBFT) operation. See the Unlock Wallet Configuration section for details.

DB Configuration

DBConfiguration section describes configuration for node database and has the following format:

DBConfiguration:
  Type: leveldb
  LevelDBOptions:
    DataDirectoryPath: /chains/privnet
    ReadOnly: false
  BoltDBOptions:
    FilePath: ./chains/privnet.bolt
    ReadOnly: false

where:

• Type is the database type (string value). Supported types: leveldb, boltdb and inmemory (not recommended for production usage).
• LevelDBOptions are settings for LevelDB. Includes the DB files path and ReadOnly mode toggle. If ReadOnly mode is on, then an error will be returned on attempt to connect to unexisting or empty database. Database doesn't allow changes in this mode, a warning will be logged on DB persist attempts.
• BoltDBOptions configures BoltDB. Includes the DB files path and ReadOnly mode toggle. If ReadOnly mode is on, then an error will be returned on attempt to connect with unexisting or empty database. Database doesn't allow changes in this mode, a warning will be logged on DB persist attempts.

Only options for the specified database type will be used.

Oracle Configuration

Oracle configuration section describes configuration for Oracle node module and has the following structure:

Oracle:
  Enabled: false
  AllowPrivateHost: false
  MaxTaskTimeout: 3600s
  MaxConcurrentRequests: 10
  Nodes: ["172.200.0.1:30333", "172.200.0.2:30334"]
  NeoFS:
    Nodes: ["172.200.0.1:30335", "172.200.0.2:30336"]
    Timeout: 2
  RefreshInterval: 180s
  RequestTimeout: 5s
  ResponseTimeout: 5s
  UnlockWallet:
    Path: "./oracle_wallet.json"
    Password: "pass"

Please, refer to the Oracle module documentation for details on configurable values.

P2P Notary Configuration

P2PNotary configuration section describes configuration for P2P Notary node module and has the following structure:

P2PNotary:
  Enabled: false
  UnlockWallet:
    Path: "/notary_wallet.json"
    Password: "pass"

where:

• Enabled denotes whether P2P Notary module is active.
• UnlockWallet is a Notary node wallet configuration, see the Unlock Wallet Configuration section for structure details.

Please, refer to the [Notary module documentation](./notary.md#Notary node module) for details on module features.

Metrics Services Configuration

Metrics services configuration describes options for metrics services (pprof, Prometheus) and has the following structure:

Pprof:
  Enabled: false
  Address: ""
  Port: "30001"
Prometheus:
  Enabled: false
  Address: ""
  Port: "40001"

where:

• Enabled denotes whether the service is enabled.
• Address is a service address to be running at.
• Port is a service port to be bound to.

RPC Configuration

RPC configuration section describes settings for the RPC server and has the following structure:

RPC:
  Enabled: true
  Address: ""
  EnableCORSWorkaround: false
  MaxGasInvoke: 50
  MaxIteratorResultItems: 100
  MaxFindResultItems: 100
  MaxNEP11Tokens: 100
  MaxWebSocketClients: 64
  Port: 10332
  SessionEnabled: false
  SessionExpirationTime: 15
  SessionBackedByMPT: false
  SessionPoolSize: 20
  StartWhenSynchronized: false
  TLSConfig:
    Address: ""
    CertFile: serv.crt
    Enabled: true
    Port: 10331
    KeyFile: serv.key

where:

• Enabled denotes whether an RPC server should be started.
• Address is an RPC server address to be running at.
• EnableCORSWorkaround turns on a set of origin-related behaviors that make RPC server wide open for connections from any origins. It enables OPTIONS request handling for pre-flight CORS and makes the server send Access-Control-Allow-Origin and Access-Control-Allow-Headers headers for regular HTTP requests (allowing any origin which effectively makes CORS useless). It also makes websocket connections work for any Origin specified in the request header. This option is not recommended (reverse proxy can be used to have proper app-specific CORS settings), but it's an easy way to make RPC interface accessible from the browser.
• MaxGasInvoke is the maximum GAS allowed to spend during invokefunction and invokescript RPC-calls.
• MaxIteratorResultItems - maximum number of elements extracted from iterator returned by invoke* call. When the MaxIteratorResultItems value is set to n, only n iterations are returned and truncated is true, indicating that there is still data to be returned.
• MaxFindResultItems - the maximum number of elements for findstates response.
• MaxNEP11Tokens - limit for the number of tokens returned from getnep11balances call.
• MaxWebSocketClients - the maximum simultaneous websocket client connection number (64 by default). Attempts to establish additional connections will lead to websocket handshake failures. Use "-1" to disable websocket connections (0 will lead to using the default value).
• Port is an RPC server port it should be bound to.
• SessionEnabled denotes whether session-based iterator JSON-RPC API is enabled. If true, then all iterators got from invoke* calls will be stored as sessions on the server side available for further traverse. traverseiterator and terminatesession JSON-RPC calls will be handled by the server. It is not recommended to enable this setting for public RPC servers due to possible DoS attack. Set to false by default. If false, iterators are expanded into a set of values (see MaxIteratorResultItems setting). Implementation note: when BoltDB storage is used as a node backend DB, then enabling iterator sessions may cause blockchain persist delays up to 2*SessionExpirationTime seconds on early blockchain lifetime stages with relatively small DB size. It can happen due to BoltDB re-mmapping behaviour traits. If regular persist is a critical requirement, then we recommend either to decrease SessionExpirationTime or to enable SessionBackedByMPT, see SessionBackedByMPT documentation for more details.
• SessionExpirationTime is a lifetime of iterator session in seconds. It is set to SecondsPerBlock seconds by default and is relevant only if SessionEnabled is set to true.
• SessionBackedByMPT is a flag forcing JSON-RPC server into using MPT-backed storage for delayed iterator traversal. If true, then iterator resources got after invoke* calls will be released immediately. Further iterator traversing will be performed using MPT-backed storage by retrieving iterator via historical MPT-provided invoke* recall. SessionBackedByMPT set to true strongly affects the traverseiterator call performance and doesn't allow iterator traversing for outdated or removed states (see KeepOnlyLatestState and RemoveUntraceableBlocks settings documentation for details), thus, it is not recommended to enable SessionBackedByMPT needlessly. SessionBackedByMPT is set to false by default and is relevant only if SessionEnabled is set to true.
• SessionPoolSize is the maximum number of concurrent iterator sessions. It is set to 20 by default. If the subsequent session can't be added to the session pool, then invocation result will contain corresponding error inside the FaultException field.
• StartWhenSynchronized controls when RPC server will be started, by default (false setting) it's started immediately and RPC is availabe during node synchronization. Setting it to true will make the node start RPC service only after full synchronization.
• TLS section configures TLS protocol.

State Root Configuration

StateRoot configuration section contains settings for state roots exchange and has the following structure:

StateRoot:
  Enabled: false
  UnlockWallet:
    Path: "./wallet.json"
    Password: "pass"

where:

• Enabled enables state root module.
• UnlockWallet contains wallet settings, see Unlock Wallet Configuration section for structure details.

Unlock Wallet Configuration

UnlockWallet configuration section contains wallet settings and has the following structure:

UnlockWallet:
  Path: "./wallet.json"
  Password: "pass"

where:

• Path is a path to wallet.
• Password is a wallet password.

Protocol Configuration

ProtocolConfiguration section of yaml node configuration file contains protocol-related settings described in the table below.

Section	Type	Default value	Description	Notes
CommitteeHistory	map[uint32]int	none	Number of committee members after the given height, for example {0: 1, 20: 4} sets up a chain with one committee member since the genesis and then changes the setting to 4 committee members at the height of 20. StandbyCommittee committee setting must have the number of keys equal or exceeding the highest value in this option. Blocks numbers where the change happens must be divisible by the old and by the new values simultaneously. If not set, committee size is derived from the StandbyCommittee setting and never changes.
GarbageCollectionPeriod	uint32	10000	Controls MPT garbage collection interval (in blocks) for configurations with RemoveUntraceableBlocks enabled and KeepOnlyLatestState disabled. In this mode the node stores a number of MPT trees (corresponding to MaxTraceableBlocks and StateSyncInterval), but the DB needs to be clean from old entries from time to time. Doing it too often will cause too much processing overhead, doing it too rarely will leave more useless data in the DB.
Hardforks	map[string]uint32	[]	The set of incompatible changes that affect node behaviour starting from the specified height. The default value is an empty set which should be interpreted as "each known hard-fork is applied from the zero blockchain height". The list of valid hard-fork names: • Aspidochelone represents hard-fork introduced in #2469 (ported from the reference). It adjusts the prices of System.Contract.CreateStandardAccount and System.Contract.CreateMultisigAccount interops so that the resulting prices are in accordance with sha256 method of native CryptoLib contract. Aspidochelone is also includes #2519 (ported from the reference). It adjusts the price of System.Runtime.GetRandom interop and fixes its vulnerability.
KeepOnlyLatestState	bool	false	Specifies if MPT should only store the latest state (or a set of latest states, see P2PStateExcangeExtensions section for details). If true, DB size will be smaller, but older roots won't be accessible. This value should remain the same for the same database.
Magic	uint32	0	Magic number which uniquely identifies NEO network.
MaxBlockSize	uint32	262144	Maximum block size in bytes.
MaxBlockSystemFee	int64	900000000000	Maximum overall transactions system fee per block.
MaxTraceableBlocks	uint32	2102400	Length of the chain accessible to smart contracts.	RemoveUntraceableBlocks should be enabled to use this setting.
MaxTransactionsPerBlock	uint16	512	Maximum number of transactions per block.
MaxValidUntilBlockIncrement	uint32	5760	Upper height increment limit for transaction's ValidUntilBlock field value relative to the current blockchain height, exceeding which a transaction will fail validation. It is set to estimated daily number of blocks with 15s interval by default.
MemPoolSize	int	50000	Size of the node's memory pool where transactions are stored before they are added to block.
NativeActivations	map[string][]uint32	ContractManagement: [0] StdLib: [0] CryptoLib: [0] LedgerContract: [0] NeoToken: [0] GasToken: [0] PolicyContract: [0] RoleManagement: [0] OracleContract: [0]	The list of histories of native contracts updates. Each list item shod be presented as a known native contract name with the corresponding list of chain's heights. The contract is not active until chain reaches the first height value specified in the list.	Notary is supported.
P2PNotaryRequestPayloadPoolSize	int	1000	Size of the node's P2P Notary request payloads memory pool where P2P Notary requests are stored before main or fallback transaction is completed and added to the chain. This option is valid only if P2PSigExtensions are enabled.	Not supported by the C# node, thus may affect heterogeneous networks functionality.
P2PSigExtensions	bool	false	Enables following additional Notary service related logic: • Transaction attributes NotValidBefore, Conflicts and NotaryAssisted • Network payload of the P2PNotaryRequest type • Native Notary contract • Notary node module	Not supported by the C# node, thus may affect heterogeneous networks functionality.
P2PStateExchangeExtensions	bool	false	Enables the following P2P MPT state data exchange logic: • StateSyncInterval protocol setting • P2P commands GetMPTDataCMD and MPTDataCMD	Not supported by the C# node, thus may affect heterogeneous networks functionality. Can be supported either on MPT-complete node (KeepOnlyLatestState=false) or on light GC-enabled node (RemoveUntraceableBlocks=true) in which case KeepOnlyLatestState setting doesn't change the behavior, an appropriate set of MPTs is always stored (see RemoveUntraceableBlocks).
RemoveUntraceableBlocks	bool	false	Denotes whether old blocks should be removed from cache and database. If enabled, then only the last MaxTraceableBlocks are stored and accessible to smart contracts. Old MPT data is also deleted in accordance with GarbageCollectionPeriod setting. If enabled along with P2PStateExchangeExtensions, then old blocks and MPT states will be removed up to the second latest state synchronisation point (see StateSyncInterval).
ReservedAttributes	bool	false	Allows to have reserved attributes range for experimental or private purposes.
SaveStorageBatch	bool	false	Enables storage batch saving before every persist. It is similar to StorageDump plugin for C# node.
SecondsPerBlock	int	15	Minimal time that should pass before next block is accepted.
SeedList	[]string	[]	List of initial nodes addresses used to establish connectivity.
StandbyCommittee	[]string	[]	List of public keys of standby committee validators are chosen from.
StateRootInHeader	bool	false	Enables storing state root in block header.	Experimental protocol extension!
StateSyncInterval	int	40000	The number of blocks between state heights available for MPT state data synchronization.	P2PStateExchangeExtensions should be enabled to use this setting.
ValidatorsCount	int	0	Number of validators set for the whole network lifetime, can't be set if ValidatorsHistory setting is used.
ValidatorsHistory	map[uint32]int	none	Number of consensus nodes to use after given height (see CommitteeHistory also). Heights where the change occurs must be divisible by the number of committee members at that height. Can't be used with ValidatorsCount not equal to zero.
VerifyBlocks	bool	false	Denotes whether to verify the received blocks.
VerifyTransactions	bool	false	Denotes whether to verify transactions in the received blocks.