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.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.admin.nodeInfo{"method": "admin_nodeInfo"}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.admin.datadir{"method": "admin_datadir"}datadir path.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.admin.peers{"method": "admin_peers"}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.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.admin.addPeer(url){"method": "admin_addPeer", "params": [url]}kni URL.true if the peer was accepted, false otherwise.removePeer is an administrative method that requests removing a node from the list of tracked static nodes.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.admin.removePeer(url){"method": "admin_removePeer", "params": [url]}kni URL.true if the peer was accepted, false otherwise.admin_startRPC. The admin_startRPC will be deprecated soon.startHTTP is an administrative method that starts an HTTP based JSON RPC API webserver to handle client requests.admin.startHTTP(host, port, cors, apis){"method": "admin_startHTTP", "params": [host, port, cors, apis]}"localhost").8551)."klay,net,rpc").true if the HTTP RPC listener was opened, false if not.admin_stopRPC. The admin_stopRPC will be deprecated soon.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.admin.stopHTTP(){"method": "admin_stopHTTP"}true if the endpoint was closed, false if not.startWS is an administrative method that starts an WebSocket based JSON RPC API webserver to handle client requests.admin.startWS(host, port, cors, apis){"method": "admin_startWS", "params": [host, port, cors, apis]}"localhost").8552)."klay,net,personal").true if the WebSocket RPC listener was opened, false if not.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.admin.stopWS(){"method": "admin_stopWS"}true if the endpoint was closed, false if not.exportChain is an administrative method that exports the blockchain to a file.admin.exportChain(fileName){"method": "admin_importChain"}, "params": [fileName]}true if chain was exported, false if not.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.admin.importChain(fileName){"method": "admin_importChain"}, "params": [fileName]}true if chain was imported, false if not.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.admin.importChainFromString(blockRlp){"method": "admin_importChainFromString"}, "params": [<blockRlp>]}debug.getBlockRlp)true if a chain was imported, or false if not.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.admin.startStateMigration(){"method": "admin_startStateMigration"}null if the state migration has started, or an error message if not.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.admin.stopStateMigration(){"method": "admin_stopStateMigration"}null if the state migration is stopped, or an error if not.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.admin.stateMigrationStatus{"method": "admin_stateMigrationStatus"}committed is the number of trie nodes that have been copied by the state migration.null if the state migration finished well, or an error if not.true if the state migration is running, or false if not.0 if the state migration is not running.)pending represents the number of trie nodes that have not been processed by the state migration.progress is the progress of the state migration calculated in percent.read represents the number of trie nodes that have been read by the state migration.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.admin.saveTrieNodeCacheToDisk(){"method": "admin_saveTrieNodeCacheToDisk"}null if saving the trie node has started, or an error message if not.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.admin.setMaxSubscriptionPerWSConn(limit){"method": "admin_setMaxSubscriptionPerWSConn"}null if the limit is set successfully; otherwise, it returns an error message.