embark/test_apps/embark_demo/config/blockchain.js

module.exports = {
  // applies to all environments
  default: {
    enabled: true,
    rpcHost: "localhost", // HTTP-RPC server listening interface (default: "localhost")
    rpcPort: 8545, // HTTP-RPC server listening port (default: 8545)
    rpcCorsDomain: "auto",  // Comma separated list of domains from which to accept cross origin requests (browser enforced)
                            // When set to "auto", Embark will automatically set the cors to the address of the webserver
    wsRPC: true, // Enable the WS-RPC server
    wsOrigins: "auto",  // Origins from which to accept websockets requests
                        // When set to "auto", Embark will automatically set the cors to the address of the webserver
    wsHost: "localhost", // WS-RPC server listening interface (default: "localhost")
    wsPort: 8546 // WS-RPC server listening port (default: 8546)
  },

  // default environment, merges with the settings in default
  // assumed to be the intended environment by `embark run` and `embark blockchain`
  development: {
    networkType: "custom", // Can be: testnet, rinkeby, livenet or custom, in which case, it will use the specified networkId
    networkId: "1337", // Network id used when networkType is custom
    isDev: true, // Uses and ephemeral proof-of-authority network with a pre-funded developer account, mining enabled
    datadir: ".embark/development/datadir", // Data directory for the databases and keystore
    mineWhenNeeded: true, // Uses our custom script (if isDev is false) to mine only when needed
    nodiscover: true, // Disables the peer discovery mechanism (manual peer addition)
    maxpeers: 0, // Maximum number of network peers (network disabled if set to 0) (default: 25)
    proxy: true, // Proxy is used to present meaningful information about transactions
    targetGasLimit: 8000000, // Target gas limit sets the artificial target gas floor for the blocks to mine
    simulatorBlocktime: 0 // Specify blockTime in seconds for automatic mining. Default is 0 and no auto-mining.
  },

  // merges with the settings in default
  // used with "embark run privatenet" and/or "embark blockchain privatenet"
  privatenet: {
    networkType: "custom",
    networkId: "1337",
    isDev: false,
    datadir: ".embark/privatenet/datadir",
    // -- mineWhenNeeded --
    // This options is only valid when isDev is false. 
    // Enabling this option uses our custom script to mine only when needed.
    // Embark creates a development account for you (using `geth account new`) and funds the account. This account can be used for
    // development (and even imported in to MetaMask). To enable correct usage, a password for this account must be specified
    // in the `account > password` setting below.
    // NOTE: once `mineWhenNeeded` is enabled, you must run an `embark reset` on your dApp before running
    // `embark blockchain` or `embark run` for the first time.
    mineWhenNeeded: true,
    // -- genesisBlock --
    // This option is only valid when mineWhenNeeded is true (which is only valid if isDev is false).
    // When enabled, geth uses POW to mine transactions as it would normally, instead of using POA as it does in --dev mode.
    // On the first `embark blockchain or embark run` after this option is enabled, geth will create a new chain with a 
    // genesis block, which can be configured using the `genesisBlock` configuration option below.
    genesisBlock: "config/privatenet/genesis.json", // Genesis block to initiate on first creation of a development node
    nodiscover: true,
    maxpeers: 0,
    proxy: true,
    targetGasLimit: 8000000,
    wsHost: "localhost",
    wsPort: 8546,
    simulatorBlocktime: 0
  },

  // merges with the settings in default
  // used with "embark run testnet" and/or "embark blockchain testnet"
  testnet: {
    networkType: "testnet",
    syncMode: "light"
  },

  // merges with the settings in default
  // used with "embark run livenet" and/or "embark blockchain livenet"
  livenet: {
    networkType: "livenet",
    syncMode: "light",
    rpcCorsDomain: "http://localhost:8000",
    wsOrigins: "http://localhost:8000"
  }

  // you can name an environment with specific settings and then specify with
  // "embark run custom_name" or "embark blockchain custom_name"
  //custom_name: {
  //}
};