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Running the application

This document covers common scenarios of launching zkSync applications set locally.

Prerequisites

Prepare dev environment prerequisites: see

Installing dependencies

Setup local dev environment

Setup:

zk # installs and builds zk itself
zk init

During the first initialization you have to download around 8 GB of setup files, this should be done once. If you have a problem on this step of the initialization, see help for the zk run plonk-setup command.

If you face any other problems with the zk init command, go to the Troubleshooting section at the end of this file. There are solutions for some common error cases.

To completely reset the dev environment:

  • Stop services:

    zk down

  • Repeat the setup procedure above

If zk init has already been executed, and now you only need to start docker containers (e.g. after reboot), simplylaunch:

zk up

(Re)deploy db and contraсts

zk contract redeploy

Environment configurations

Env config files are held in etc/env/

List configurations:

zk env

Switch between configurations:

zk env <ENV_NAME>

Default confiruration is dev.env, which is generated automatically from dev.env.example during zk init commandexecution.

Build and run server + prover locally for development

Run server:

zk server

Server is configured using env files in ./etc/env directory. After the first initialization, file ./etc/env/dev.envwill be created. By default, this file is copied from the ./etc/env/dev.env.example template.

Server can produce block of different sizes, the list of available sizes is determined by theSUPPORTED_BLOCK_CHUNKS_SIZES environment variable. Block sizes which will actually be produced by the server can be configured using the BLOCK_CHUNK_SIZES environment variable.

Note: for proof generation for large blocks requires a lot of resources and an average user machine is only capable ofcreating proofs for the smallest block sizes. As an alternative, a dummy-prover may be used for development (see[development.md](https://hackmd.io/S7hTv1EwSpWu8VCReDmsBg) for details).

Run prover:

zk prover

Make sure you have environment variables set right, you can check it by running: zk env. You should see * dev inoutput.

Troubleshooting

SSL error: certificate verify failed

Problem. zk init fails with the following error:

Initializing download: https://universal-setup.ams3.digitaloceanspaces.com/setup_2%5E20.key
SSL error: certificate verify failed

Solution. Make sure that the version of axel on your computer is 2.17.10.

rmSync is not a function

Problem. zk init fails with the following error:

fs_1.default.rmSync is not a function

Solution. Make sure that the version of node.js installed on your computer is 14.14.0 or higher.