# Contracts deployments ### Deployment requirements To follow this guide, you must have the following installed: * [nodejs >= v12.x & npm >= 6.x](https://nodejs.org/en/) * [yarn >= 1.x](https://classic.yarnpkg.com/lang/en/docs/install/) ### Set up the local environment At first, you have to pull the [mellow vaults repository](https://github.com/mellow-finance/mellow-vaults) and checkout on the actual main branch. ``` git clone https://github.com/mellow-finance/mellow-vaults.git ``` Secondly, you should install all necessary dependencies, including [hardhat](https://hardhat.org/). ``` yarn ``` Then you have to set up environment variables. You can do it by creating `.env` file and set the required variables there. ``` // .env MAINNET_RPC= MAINNET_DEPLOYER_PK=0x... # for mainnet deploy MAINNET_PROTOCOL_ADMIN_ADDRESS=0x... MAINNET_STRATEGY_ADMIN_ADDRESS=0x... MAINNET_PROTOCOL_TREASURY_ADDRESS=0x... MAINNET_STRATEGY_TREASURY_ADDRESS=0x... _RPC= _DEPLOYER_PK=0x... # for specific chain deploy ``` Make sure, that all necessary constants in `hardhat.config.js` file is set. Congratulations! You are ready to deploy. ### Deploying You must check the gas value on chain block explorer for smooth deployment and update `TRANSACTION_GAS_LIMITS` constant at `deploy/0000_utils.ts` file with actual values. Hardhat sometimes couldn't estimate base and priority fees correctly, so we set `maxFeePerGas` and `maxPriorityFeePerGas` manually in weis to prevent transaction execution from failing. Everything we have to do now is to only run one command in the shell to deploy the system. ``` yarn deploy:mainnet ``` You can also use `yarn deploy:` for deploying on any other chain, but make sure that this command is initialized in `package.json`. In case of the command failing check, that you've set all necessary env variables, and re-run it. The command won't redeploy contracts, that have already been deployed, except strategies. ### Verifying You can verify contracts after deployment using the following command ``` yarn verify:mainnet ``` You can also use `yarn verify:` for deploying on any other chain, but make sure that this command is initialized in `package.json`.