Deploying contracts using geth

After writing your smart contract, it is time to deploy it in Ethereum. In this recipe, you will learn about deploying your smart contract and testing it to ensure that it works as intended.

Getting ready

You will need a working installation of the solc compiler to compile your contract and geth to deploy it. We will be using the geth JavaScript console to run the deployment and transaction scripts.

How to do it...

1. Here is our simple smart contract example:

pragma solidity ^0.4.21;

contract HelloWorld {

    string public greeting = "Hello World";

    function changeGreeting(string _newGreeting) public {
        greeting = _newGreeting;
    }

}

2. Use solc or other alternatives to compile the contract into ABI and bytecode:

$ solc --optimize --bin --abi HelloWorld.sol

3. Start the geth node with the web3 console:

$ geth console 2>> ./geth.log

4. Make sure that you have enough Ether for deployment. If you are using a private network, make sure to start mining before performing...