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83 lines
2.8 KiB
83 lines
2.8 KiB
6 years ago
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description: Configuring Free Gas Networks
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# Free Gas Networks
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Transactions have an associated cost. Gas is the cost unit and the gas price is the price per gas unit.
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The transaction cost is the gas used * gas price.
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In public networks, the transaction cost is paid in Ether by the account submitting the transaction.
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The transaction cost is paid to the miner (or validator in PoA networks) that includes the transaction in a block.
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In many private networks, the validators are run by the network participants and do not require gas as an
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incentive to participate. Generally, networks that do not require gas as an incentive, configure the gas price to be 0 (that is, make gas free).
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Some private networks may allocate Ether and use a non-zero gas price to limit resource use.
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!!! tip
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We are using the term _free gas network_ to refer to a network where the gas price is set to zero.
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A network with gas price of zero is also known as a _zero gas network_ or _no gas network_.
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In a free gas network, transactions still use gas but the gas price is 0 meaning the transaction cost is 0:
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Transaction cost = gas used * 0 (gas price)
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## Configuring Pantheon for Free Gas
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When gas is free, limiting block and contract sizes is less important. In free gas networks, we set
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block and contract size limits to the maximum values.
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### 1. Set Block Size
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Set the block size limit (measured in gas) to the maximum accepted by Truffle (`0x1fffffffffffff`) in the genesis file:
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```json
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“gasLimit”: “0x1fffffffffffff”
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```
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### 2. Set Contract Size
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Set the contract size limit to the maximum supported size (in bytes) in the `config` section of the genesis file:
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```json
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“contractSizeLimit”: 2147483647
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```
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### 3. Start Pantheon with Minimum Gas Price of 0
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When starting validators (mining nodes in a PoW network), set the [minimum gas price](../Reference/Pantheon-CLI-Syntax.md#min-gas-price) to 0:
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```bash tab="Command Line"
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--min-gas-price=0
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```
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```bash tab="Configuration File"
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min-gas-price=0
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```
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## Configuring Truffle for Free Gas
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If using Truffle to develop on your free gas network, you also need to configure Truffle for free gas.
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Similar to setting block and contract size limits to their maximum values for Pantheon, we set the
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gas limit for transactions in Truffle to the maximum possible.
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!!! important
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Pantheon does not implement private key management. To use Pantheon with Truffle, you must configure
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a [Truffle wallet](../Using-Pantheon/Truffle.md).
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### Update truffle-config.js
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Update the `truffle-config.js` file:
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1. Set the gas price to 0:
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```js
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gasPrice:0
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```
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1. Set the gas limit for a transaction (that is, contract creation) to be the block gas limit - 1
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```js
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gas: “0x1ffffffffffffe”
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```
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