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VARIABLES.md

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Configuration of the Node

The node can be configured via environment variables or command-line arguments. Below is a summary of the environment variables available. To see a full list of available variables provide the --help flag to the executable.

Common

Common configurations for the node. These options are shared among the different modes of operations for nodes.

  • CONCORDIUM_NODE_ID Force sets the node id. Note the id must be a 64 bit unsigned integer in zero padded HEX. Must be 16 characters long.

  • CONCORDIUM_NODE_LISTEN_ADDRESS The address on which the node listens on.

  • CONCORDIUM_NODE_LISTEN_PORT The port on which the node is listening for incoming connections. The port should be reachable, hence the port should be open in any firewall rules. The default value is 8888.

  • CONCORDIUM_NODE_EXTERNAL_PORT is related to the CONCORDIUM_NODE_LISTEN_PORT. If the external port of the server is not the same as the listening port i.e., it has been remapped. Then this should be set to the external port in order to allow other nodes to connect to this node.

  • CONCORDIUM_NODE_CONFIG_DIR Where the node should store its configuration.

  • CONCORDIUM_NODE_DATA_DIR Where the node should store its data, in particular the nodes database is stored here.

Validator

Configurations related to running a validator.

  • CONCORDIUM_NODE_VALIDATOR_CREDENTIALS_FILE A path to the file containing the validator keys. The filepath must be either an absolute path or a relative filepath to the CWD of the process. If this variable is not set, then the node is not eligible for baking.

Connection

Network related configurations for a node.

  • CONCORDIUM_NODE_CONNECTION_DESIRED_NODES Specifies the minimum number of nodes that the node wishes. If the node has fewer connected nodes than specified, then the node will try to acquire more nodes via bootstrapping or requesting more nodes from its existing peers. The default value is 7.

  • CONCORDIUM_NODE_CONNECTION_MAX_ALLOWED_NODES Is the maximum allowed number of peers the node will tolerate. If the node gets more than specified, then the node will start dropping its peers until the number of peers is below the specified amount.

  • CONCORDIUM_NODE_CONNECTION_MAX_ALLOWED_NODES_PERCENTAGE Is the default way of setting the maximum number of peers, that the node will tolerate. This variable is set as a percentage wrt. CONCORDIUM_NODE_CONNECTION_DESIRED_NODES. The default value is 150.

  • CONCORDIUM_NODE_CONNECTION_BOOTSTRAP_NODES A comma separated list of URLs specifying the first nodes that the node should connect to. (This option disables DNS bootstrapping feature).

  • CONCORDIUM_NODE_CONNECTION_HARD_CONNECTION_LIMIT Is the maximum number of connections (as opposed to nodes) that a node will have at a given time. This should be set a bit higher than the maximum number of nodes, so that new peers are accepted and discovered over time. The default value is 20.

  • CONCORDIUM_NODE_CONNECTION_THREAD_POOL_SIZE Specifies the thread pool size of the node for handling connection events in parallel. The default value is 4.