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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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86 lines
4.1 KiB
86 lines
4.1 KiB
6 years ago
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description: Managing Pantheon peers
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<!--- END of page meta data -->
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# Managing Peers
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## Limiting Peers
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Limiting peers reduces the bandwidth used by Pantheon. It also reduces the CPU time and disk access
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used to manage and respond to peers.
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Use the [`--max-peers`](../../Reference/Pantheon-CLI-Syntax.md#max-peers) command line option to reduce
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the maximum number of peers. The default is 25.
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## No Discovery
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The [`--discovery-enabled`](../../Reference/Pantheon-CLI-Syntax.md#discovery-enabled) command line option
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can be used to disable P2P peer discovery.
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Set this option to `false` if you are running a test node or a network with [static nodes](#static-nodes).
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## Static Nodes
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Static nodes are configured nodes that remain connected rather than nodes connected through P2P discovery.
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Static nodes attempt to maintain connectivity. If a connection goes down to a static node,
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the node attempts to reconnect every 60 seconds.
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To configure a network of static nodes:
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1. List [enode URLs](../Node-Keys.md#enode-url) of the nodes in the [`static-nodes.json` file](#static-nodesjson-file).
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1. Save the `static-nodes.json` file in the data directory of each node.
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1. Start Pantheon with discovery disabled using [`--discovery-enabled=false`](../../Reference/Pantheon-CLI-Syntax.md#discovery-enabled).
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To modify the static peers at run time, use the [`admin_addPeer`](../../Reference/JSON-RPC-API-Methods.md#admin_addpeer)
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and [`admin_removePeer`](../../Reference/JSON-RPC-API-Methods.md#admin_removepeer) JSON-RPC API methods.
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!!! note
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Runtime modifications of static nodes are not persisted between runs. The `static-nodes.json` file
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is not updated by `admin_addPeer` and `admin_removePeer` methods.
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Nodes outside of the static nodes are not prevented from connecting. To prevent nodes from connecting,
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use [Permissioning](../../Permissions/Permissioning.md).
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!!! caution
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If the added peer does not appear in the peer list (returned by [`admin_peers`](../../Reference/JSON-RPC-API-Methods.md#admin_peers)),
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check the supplied [enode URL](../Node-Keys.md#enode-url) is correct, the node is running, the node is listening for
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TCP connections on the endpoint, and has not reached the [maximum number of peers](#limiting-peers).
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### static-nodes.json File
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The `static-nodes.json` file must be located in the data directory (specified by [`--data-path`](../../Reference/Pantheon-CLI-Syntax.md#data-path))
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and contain a JSON array of [enode URLs](../Node-Keys.md#enode-url).
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!!! example
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```json
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[
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"enode://cea71cb65a471037e01508cebcc178f176f9d5267bf29507ea1f6431eb6a5dc67d086dc8dc54358a72299dab1161febc5d7af49d1609c69b42b5e54544145d4f@127.0.0.1:30303",
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"enode://ca05e940488614402705a6b6836288ea902169ecc67a89e1bd5ef94bc0d1933f20be16bc881ffb4be59f521afa8718fc26eec2b0e90f2cd0f44f99bc8103e60f@127.0.0.1:30304"
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]
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```
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!!! note
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Each node has a `static-nodes.json` file. We recommend each node in the network has the same `static-nodes.json` file.
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## Monitoring Peer Connections
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JSON-RPC API methods to monitor peer connections include:
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* [`net_peerCount`](../../Reference/JSON-RPC-API-Methods.md#net_peercount)
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* [`admin_peers`](../../Reference/JSON-RPC-API-Methods.md#admin_peers)
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* [`debug_metrics`](../../Reference/JSON-RPC-API-Methods.md#debug_metrics)
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## Node Connections
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The default logging configuration does not list node connection and disconnection messages.
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To enable listing of node connection and disconnection messages, specify the
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[`--logging`](../../Reference/Pantheon-CLI-Syntax.md#logging) command line option `--logging=DEBUG`.
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For more verbosity, specify `--logging=TRACE`.
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The console logs connection and disconnection events when the log level is `DEBUG` or higher.
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If `Successfully accepted connection from ...` is displayed, connections are getting through the firewalls.
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!!! example "Example log output"
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`2018-10-16 12:37:35.479-04:00 | nioEventLoopGroup-3-1 | INFO | NettyP2PNetwork | Successfully accepted connection from 0xa979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c`
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