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admin
APIs to control Klaytn node.
The namespace
admin gives you access to several non-standard RPC methods. They will allow you to have fine-grained control over your Klaytn instance, including but not limited to network peer and RPC endpoint management.The
nodeInfo administrative property can be queried for all the information known about the running Klaytn node at the networking granularity. These include general information about the node itself as a participant of the devp2p P2P overlay protocol, as well as specialized information added by each of the running application protocols, e.g., klay.Client | Method invocation |
|---|---|
Console | admin.nodeInfo |
RPC | {"method": "admin_nodeInfo"} |
Parameters
None
Return Value
Type | Description |
|---|---|
JSON string | The node information. |
Example
Console
> admin.nodeInfo
{
kni: "kni://0bbff960d26fc12a5153ac25d7aaffd654e073a74a8b1aa65034250d47fac610ebe99a83d21d741c6121a32fb01312b49fc0633ae04e80c5eb73c3bc71c5a850@[::]:32323?discport=0",
id: "0bbff960d26fc12a5153ac25d7aaffd654e073a74a8b1aa65034250d47fac610ebe99a83d21d741c6121a32fb01312b49fc0633ae04e80c5eb73c3bc71c5a850",
ip: "::",
listenAddr: "[::]:32323",
name: "Klaytn/validator-1/vX.X.X/XXXX-XXXX/goX.X.X",
ports: {
discovery: 0,
listener: 32323
},
protocols: {
istanbul: {
config: {
chainId: 2018,
isBFT: true,
istanbul: {...},
unitPrice: 0
},
difficulty: 52794,
genesis: "0x42824367c973785245923a712cf2e5a99aae6a26f44e4f1ec686a0e60986644e",
head: "0x4c3000a6f8c40b0507d8ee4a3fc5c9865df0a8d66f882366ea95473c87342005",
network: 2017
}
}
}
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_nodeInfo","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,
"result": {"id":"377ef808aff73a397d133b3bf160df586054c98c0e6a65c8fce9560e6a0632bc975419f461803d27f28ee270287113cc2359225814debc1bfb2f811061e14c5d", "name":"Klaytn/vvX.X.X/XXXX-XXXX/goX.X.X", "kni":"kni://377ef808aff73a397d133b3bf160df586054c98c0e6a65c8fce9560e6a0632bc975419f461803d27f28ee270287113cc2359225814debc1bfb2f811061e14c5d@[::]:32323?discport=0",
"ip":"::",
"ports":{"discovery":0,"listener":32323},
"listenAddr":"[::]:32323",
"protocols":{"istanbul":{"network":1000,"difficulty":1,"genesis":"0x06806bd8b1e086dfb7098a289da07037a3af58e793d205d20f61c88eeea9351d","config":{"chainId":1000,"istanbul":{"epoch":30000,"policy":0,"sub":7},"isBFT":true,"unitPrice":25000000000,"deriveShaImpl":0},"head":"0x06806bd8b1e086dfb7098a289da07037a3af58e793d205d20f61c88eeea9351d"}}}}
The
datadir administrative property can be queried for the absolute path the running Klaytn node currently uses to store all its databases. The default path is different depending on the node types (kcn, kpn, and ken) and the OS type.Client | Method invocation |
|---|---|
Console | admin.datadir |
RPC | {"method": "admin_datadir"} |
Parameters
None
Return Value
Type | Description |
|---|---|
string | The datadir path. |
Example
Console
> admin.datadir
"/home/user/Library/KEN"
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_datadir","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":"/your/dir/ken/data/dd"}
The
peers administrative property can be queried for all the information known about the connected remote nodes at the networking granularity. These include general information about the nodes themselves as participants of the devp2p P2P overlay protocol, as well as specialized information added by each of the running application protocols.Client | Method invocation |
|---|---|
Console | admin.peers |
RPC | {"method": "admin_peers"} |
Parameters
None
Return Value
Type | Description |
|---|---|
JSON string | The information about all connected peers. |
Example
Console
> admin.peers
[{
caps: ["istanbul/64"],
id: "5d73afadf1eb4d6ccd1e10ab0f00301a1642b102fb521f170f4eaa4b3cb9a58788d1e2b387d6ce3726cb4786d034feb7dd17b5055b6d9a888520011e5756c89e",
name: "Klaytn/validator-3/vX.X.X/XXXX-XXXX/goX.X.X",
network: {
inbound: true,
localAddress: "127.0.0.1:32323",
nodeType: "cn",
remoteAddress: "127.0.0.1:63323",
static: false,
trusted: false
},
protocols: {
istanbul: {
difficulty: 52794,
head: "0x4c3000a6f8c40b0507d8ee4a3fc5c9865df0a8d66f882366ea95473c87342005",
version: 64
}
}
}, /* ... */ {
caps: ["istanbul/64"],
id: "8bcf4297aa6bb46121bb20a18b7af8f1eaad7e7435c71cb64109511a73c5507744bca138ee76b52d06cecedde9d88fdfddbffc5c3b80c5cbace3c326d5df5f1f",
name: "Klaytn/validator-2/vX.X.X/XXXX-XXXX/goX.X.X",
networks: [{
inbound: true,
localAddress: "127.0.0.1:32323",
nodeType: "cn",
remoteAddress: "127.0.0.1:63247",
static: false,
trusted: false
}],
protocols: {
istanbul: {
difficulty: 52794,
head: "0x4c3000a6f8c40b0507d8ee4a3fc5c9865df0a8d66f882366ea95473c87342005",
version: 64
}
}
}]
HTTP RPC
NOTE: All IP addresses below are shown as examples. Please replace them with the actual IP addresses in your execution environment.
curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_peers","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":[{"id":"144af69d2bb030c6a2a5ceee7445dc613e200f19358547cffc353d56e6c8a5b4186a6953c028b6afd0ab3c2bfc4c86f24b0bf855d0686b964ec65cefd3deec37","name":"Klaytn/vvX.X.X/XXXX-XXXX/goX.X.X","caps":["istanbul/64"],"network":{"localAddress":"10.0.10.1:49355","remoteAddress":"10.0.0.1:32323","inbound":false,"trusted":false,"static":true},"protocols":{"istanbul":{"version":64,"difficulty":1285901,"head":"0x2d04ac52df4af08a9a0e15d5939c29decb00031e7b3f6abd05bc0c731f6b5561"}}},{"id":"a875620f67f0b12edb97d0ec269e7940f2505b1f62576f39858c37e1d7f956318c3a619239f03f806a79ccaa8e7e9b5def343c24a9fd2e9d715964e0952dd995","name":"Klaytn/vvX.X.X/XXXX-XXXX/goX.X.X","caps":["istanbul/64"],"networks":[{"localAddress":"10.0.10.2:49353","remoteAddress":"10.0.0.2:32323","inbound":false,"trusted":false,"static":true}],"protocols":{"istanbul":{"version":64,"difficulty":1285901,"head":"0x2d04ac52df4af08a9a0e15d5939c29decb00031e7b3f6abd05bc0c731f6b5561"}}},{"id":"e18d6d4e0ffac0a51028a8d49a548295ac8ac50d064f3581600799a3ae761a61f0b39c38b4195e163e01f30db616debf61b5b2ddea716bc8fb1c907ce7a1de26","name":"Klaytn/vvX.X.X/XXXX-XXXX/goX.X.X","caps":["istanbul/64"],"network":{"localAddress":"10.0.10.3:49354","remoteAddress":"10.0.0.3:32323","inbound":false,"trusted":false,"static":true},"protocols":{"istanbul":{"version":64,"difficulty":1285900,"head":"0x2e228a45c7c9b9e6729b6c66b31957d6cb62ce53e32cedf156615a4e8a2e253a"}}}]}
The
addPeer is an administrative method that requests adding a new remote node to the list of tracked static nodes. The node will try to maintain connectivity to these nodes at all times, reconnecting every once in a while if the remote connection goes down.The method accepts a single argument kni, which means "Klaytn Network Identifier". It is similar to the
enode concept in the geth. It is URL of the remote peer to start tracking and returns a BOOL indicating whether the peer was accepted for tracking or some error occurred.Client | Method invocation |
|---|---|
Console | admin.addPeer(url) |
RPC | {"method": "admin_addPeer", "params": [url]} |
Parameters
Name | Type | Description |
|---|---|---|
url | string | Peer's kni URL. |
Return Value
Type | Description |
|---|---|
bool | true if the peer was accepted, false otherwise. |
Example
Console
> admin.addPeer("kni://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5eb[email protected]:32323") //This is an example address.
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_addPeer","params":["kni://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f13477[email protected]:32323"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
removePeer is an administrative method that requests removing a node from the list of tracked static nodes.The method accepts a single argument kni, which means "Klaytn Network Identifier". It is similar to the
enode concept in the geth. It is URL of the remote peer to be removed from a list and returns a BOOL indicating whether the peer was removed or some error occurred.Client | Method invocation |
|---|---|
Console | admin.removePeer(url) |
RPC | {"method": "admin_removePeer", "params": [url]} |
Parameters
Name | Type | Description |
|---|---|---|
url | string | Peer's kni URL. |
Return Value
Type | Description |
|---|---|
bool | true if the peer was accepted, false otherwise. |
Example
Console
> admin.removePeer("kni://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5eb[email protected]:32323") //This is an example address.
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_removePeer","params":["kni://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f13477[email protected]:32323"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
NOTE: This API replaces
admin_startRPC. The admin_startRPC will be deprecated soon.The
startHTTP is an administrative method that starts an HTTP based JSON RPC API webserver to handle client requests.The method returns a boolean flag specifying whether the HTTP RPC listener was opened or not. Please note, only one HTTP endpoint is allowed to be active at any time.
Client | Method invocation |
|---|---|
Console | admin.startHTTP(host, port, cors, apis) |
RPC | {"method": "admin_startHTTP", "params": [host, port, cors, apis]} |
Parameters
Name | Type | Description |
|---|---|---|
host | string | (optional) network interface to open the listener socket on (default: "localhost"). |
port | int | (optional) network port to open the listener socket on (default: 8551). |
cors | string | |
apis | string | (optional) API modules to offer over this interface (default: "klay,net,rpc"). |
Return Value
Type | Description |
|---|---|
bool | true if the HTTP RPC listener was opened, false if not. |
Example
Console
> admin.startHTTP("127.0.0.1", 8551)
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_startHTTP","id":1, "params":["127.0.0.1", 8551, "", "klay"]}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"HTTP RPC already running on 127.0.0.1:8551"}}
NOTE: This API replaces
admin_stopRPC. The admin_stopRPC will be deprecated soon.The
stopHTTP is an administrative method that closes the currently open HTTP RPC endpoint. As the node can only have a single HTTP endpoint running, this method takes no parameters, returning a boolean whether the endpoint was closed or not.Client | Method invocation |
|---|---|
Console | admin.stopHTTP() |
RPC | {"method": "admin_stopHTTP"} |
Parameters
None
Return Value
Type | Description |
|---|---|
bool | true if the endpoint was closed, false if not. |
Example
Console
> admin.stopHTTP()
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_stopHTTP","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
startWS is an administrative method that starts an WebSocket based JSON RPC API webserver to handle client requests.The method returns a boolean flag specifying whether the WebSocket RPC listener was opened or not. Please note, only one WebSocket endpoint is allowed to be active at any time.
Client | Method invocation |
|---|---|
Console | admin.startWS(host, port, cors, apis) |
RPC | {"method": "admin_startWS", "params": [host, port, cors, apis]} |
Parameters
Name | Type | Description |
|---|---|---|
host | string | (optional) network interface to open the listener socket on (default: "localhost"). |
port | int | (optional) network port to open the listener socket on (default: 8552). |
cors | string | |
apis | string | (optional) API modules to offer over this interface (default: "klay,net,personal"). |
Return Value
Type | Description |
|---|---|
bool | true if the WebSocket RPC listener was opened, false if not. |
Example
Console
> admin.startWS("127.0.0.1", 8552)
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_startWS","params":["127.0.0.1", 8552, "", "klay"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
stopWS is an administrative method that closes the currently open WebSocket RPC endpoint. As the node can only have a single WebSocket endpoint running, this method takes no parameters, returning a boolean whether the endpoint was closed or not.Client | Method invocation |
|---|---|
Console | admin.stopWS() |
RPC | {"method": "admin_stopWS"} |
Parameters
None
Return Value
Type | Description |
|---|---|
bool | true if the endpoint was closed, false if not. |
Example
Console
> admin.stopWS()
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_stopWS","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
exportChain is an administrative method that exports the blockchain to a file.Client | Method invocation |
|---|---|
Console | admin.exportChain(fileName) |
RPC | {"method": "admin_exportChain"}, "params": [fileName, startBlockNum, endBlockNum]} |
Parameters
Name | Type | Description |
|---|---|---|
fileName | string | the fully qualified path to the file where the blockchain must be exported. |
startBlockNum | int | (optional) The first block number of the range to export. |
endBlockNum | int | (optional) The last block number of the range. |
Return Value
Type | Description |
|---|---|
bool | true if chain was exported, false if not. |
Example
Console
> admin.exportChain("/tmp/chain.txt")
true
> admin.exportChain("/tmp/chain.txt", 555)
true
> admin.exportChain("/tmp/chain.txt", 1, 1000)
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_exportChain","params":["/tmp/chain.txt"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
importChain is an administrative method that imports an exported chain from a file into a node. This method imports only blocks that haven't existed in a Klaytn node. This method does not delete any data of the existing chain.Client | Method invocation |
|---|---|
Console | admin.importChain(fileName) |
RPC | {"method": "admin_importChain"}, "params": [fileName]} |
Parameters
Name | Type | Description |
|---|---|---|
fileName | string | the fully qualified path to the file containing the chain to be imported. |
Return Value
Type | Description |
|---|---|
bool | true if chain was imported, false if not. |
Example
Console
> admin.importChain("/tmp/chain.txt")
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_importChain","params":["/tmp/chain.txt"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
importChainFromString is an administrative method that imports a chain from a RLP-encoded string of blocks into a Klaytn node. This only works if there is no existing chain in a Klaytn node. This method does not delete any data of the existing chain.Client | Method invocation |
|---|---|
Console | admin.importChainFromString(blockRlp) |
RPC | {"method": "admin_importChainFromString"}, "params": [<blockRlp>]} |
Parameters
Name | Type | Description |
|---|---|---|
blockRlp | string | the RLP-encoded string that represents the blocks to be imported. (equals to the return value of debug.getBlockRlp) |
Return Value
Type | Description |
|---|---|
bool | true if a chain was imported, or false if not. |
Example
Console
> admin.importChainFromString("f9071...080c0")
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_importChainFromString","params":["f9071...080c0"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":true}
The
startStateMigration is an administrative method that starts a state migration and removes old state/storage trie nodes. This can save the storage space of a Klaytn node. The method returns an error if it fails to start a state migration, or null if it succeeds to start. NOTE: After the state migration, the node cannot serve APIs with previous states.Client | Method invocation |
|---|---|
Console | admin.startStateMigration() |
RPC | {"method": "admin_startStateMigration"} |
Parameters
None
Return Value
Type | Description |
|---|---|
Error | null if the state migration has started, or an error message if not. |
Example
Console
> admin.startStateMigration()
null
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_startStateMigration","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}
The
stopStateMigration is an administrative method that stops the currently running state migration. This method takes no parameters and returns null or an error whether the state migration was stopped or not.Client | Method invocation |
|---|---|
Console | admin.stopStateMigration() |
RPC | {"method": "admin_stopStateMigration"} |
Parameters
None
Return Value
Type | Description |
|---|---|
Error | null if the state migration is stopped, or an error if not. |
Example
Console
> admin.stopStateMigration()
true
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_stopStateMigration","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}
The
stateMigrationStatus is an administrative method that returns the status information of the state migration. This method takes no parameters and returns the status of the currently running state migration.Client | Method invocation |
|---|---|
Console | admin.stateMigrationStatus |
RPC | {"method": "admin_stateMigrationStatus"} |
Parameters
None
Return Value
Name | Type | Description |
|---|---|---|
committed | int | committed is the number of trie nodes that have been copied by the state migration. |
err | Error | null if the state migration finished well, or an error if not. |
isMigration | bool | true if the state migration is running, or false if not. |
migrationBlockNumber | uint64 | a blockNumber which the state migration started at. ( 0 if the state migration is not running.) |
pending | int | pending represents the number of trie nodes that have not been processed by the state migration. |
progress | float64 | progress is the progress of the state migration calculated in percent. |
read | int | read represents the number of trie nodes that have been read by the state migration. |
Example
Console
> admin.stateMigrationStatus
{
committed: 1585169,
err: "null",
isMigration: true,
migrationBlockNumber: 32527233,
pending: 27677,
progress: 0.3662109375,
read: 1587473
}
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_stateMigrationStatus","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":{"committed":14995692,"err":"null","isMigration":true,"migrationBlockNumber":32630836,"pending":19699,"progress":25,"read":14997777}}
The
saveTrieNodeCacheToDisk is an administrative method that starts saving the cached trie node to the disk to reuse them when the node restarts. Cached trie node data will be stored to and loaded from $DATA_DIR/fastcache . This method returns an error if the saving process has been already triggered or trie node cache is disabled. This feature is supported since Klaytn 1.5.3.Client | Method invocation |
|---|---|
Console | admin.saveTrieNodeCacheToDisk() |
RPC | {"method": "admin_saveTrieNodeCacheToDisk"} |
Parameters
None
Return Value
Type | Description |
|---|---|
Error | null if saving the trie node has started, or an error message if not. |
Example
Console
> admin.saveTrieNodeCacheToDisk()
null
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_saveTrieNodeCacheToDisk", "id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}
The
setMaxSubscriptionPerWSConn is an administrative method that sets the maximum allowed number of subscriptions per single WebSocket connection. For example, if the maximum number is set to five and a user requests more than five subscriptions through the klay_subscribe API, an error message "Maximum 5 subscriptions are allowed for a WebSocket connection" will be displayed. This feature is supported since Klaytn 1.6.0.Client | Method invocation |
|---|---|
Console | admin.setMaxSubscriptionPerWSConn(limit) |
RPC | {"method": "admin_setMaxSubscriptionPerWSConn"} |
Parameters
Name | Type | Description |
|---|---|---|
limit | int | The maximum allowed number of subscriptions per single WebSocket connection. |
Return Value
Type | Description |
|---|---|
Error | null if the limit is set successfully; otherwise, it returns an error message. |
Example
Console
> admin.setMaxSubscriptionPerWSConn(5)
null
HTTP RPC
$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"admin_setMaxSubscriptionPerWSConn", "params":[5], "id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}
Last modified 1mo ago