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besu/docs/Configuring-Pantheon/Using-Configuration-File.md

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# Using a Configuration File
To specify command line options in a file, use a TOML configuration file.
The configuration file can be saved and reused across node startups. To specify the configuration file,
use the [`--config-file`](../Reference/Pantheon-CLI-Syntax.md#config-file) option.
!!!note
The [`--config-file`](../Reference/Pantheon-CLI-Syntax.md#config-file) option is not used when running Pantheon from the [Docker image](../Getting-Started/Run-Docker-Image.md).
Use a bind mount to [specify a configuration file with Docker](../Getting-Started/Run-Docker-Image.md#custom-configuration-file).
To override an option specified in the configuration file, specify the same option on the command line or as
an [environment variable](../Reference/Pantheon-CLI-Syntax.md#pantheon-environment-variables). If an option is specified in multiple places,
the order of priority is command line, environment variable, configuration file.
## TOML Specification
The configuration file must be a valid TOML file and is composed of key/value pairs. Each key is the
same as the corresponding command line option name without the leading dashes (`--`).
Values must be be specified according to TOML specifications for string, numbers, arrays, and booleans.
Specific differences between the command line and the TOML file format are:
* Comma-separated lists on the command line are string arrays in the TOML file
* File paths, hexadecimal numbers, URLs, and <host:port> values must be enclosed in quotes.
!!!tip
The [command line reference](../Reference/Pantheon-CLI-Syntax.md) includes configuration file examples for each option.
!!!example "Example TOML configuration file"
```toml
# Valid TOML config file
data-path="~/pantheondata" # Path
# Network
bootnodes=["enode://001@123:4567", "enode://002@123:4567", "enode://003@123:4567"]
p2p-host="1.2.3.4"
p2p-port=1234
max-peers=42
rpc-http-host="5.6.7.8"
rpc-http-port=5678
rpc-ws-host="9.10.11.12"
rpc-ws-port=9101
# Chain
genesis-file="~/genesis.json" # Path to the custom genesis file
# Mining
miner-enabled=true
miner-coinbase="0xfe3b557e8fb62b89f4916b721be55ceb828dbd73"
```
!!!example "Starting Pantheon with a Configuration File"
```bash
pantheon --config-file=/home/me/me_node/config.toml
```