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Installing dependencies

Supported operating systems

zkSync is currently can be launched on any *nix operating system (e.g. any linux distribution or MacOS).

If you're using Windows, then make sure to use WSL 2, since WSL 1 is known to cause troubles.

Additionally, if you are going to use WSL 2, make sure that your project is located in the linux filesystem, since accessing NTFS partitions from inside of WSL is very slow.

If you are a NixOS user or would like to have a reproducible environment, skip to the section about nix.

git

If you are using an ssh key to authenticate with Github you need to make git always use ssh instead of http.

git config url."ssh://git@github.com/".insteadOf https://github.com/

More information about how we use git

Docker

Install docker. It is recommended to follow the instructions from the official site.

Note: currently official site proposes using Docker Desktop for linux, which is a GUI tool with plenty of quirks. If you want to only have CLI tool, you need the docker-ce package and you can follow this guide for Ubuntu.

Installing docker via snap or from the default repository can cause troubles.

You need to install both docker and docker-compose.

Note: docker-compose is installed automatically with Docker Desktop.

Note: On linux you may encounter the following error when you’ll try to work with zksync:

ERROR: Couldn't connect to Docker daemon - you might need to run `docker-machine start default`.

If so, you do not need to install docker-machine. Most probably, it means that your user is not added to thedocker group. You can check it as follows:

docker-compose up # Should raise the same error.
sudo docker-compose up # Should start doing things.

If the first command fails, but the second succeeds, then you need to add your user to the docker group:

sudo usermod -a -G docker your_user_name

After that, you should logout and login again (user groups are refreshed after the login). The problem should be solved at this step.

If logging out does not help, restarting the computer should.

Node & Yarn

  1. Install Node (requires version 16.19.1). Since our team attempts to always use the latest LTS version ofNode.js, we suggest you to install nvm. It will allow you to update Node.jsversion easily in the future (by running nvm use 16.19.1)
  2. Install yarn (make sure to get version 1.22.19 - you can change the version by running yarn set version 1.22.19). Instructions can be found on the official site.
    Check if yarn is installed by running yarn -v. If you face any problems when installing yarn, it might be the case that your package manager installed the wrong package.Make sure to thoroughly follow the instructions above on the official website. It contains a lot of troubleshooting guides in it.

Axel

Install axel for downloading keys:

On mac:

brew install axel

On debian-based linux:

sudo apt-get install axel

Check the version of axel with the following command:

axel --version

Make sure the version is higher than 2.17.10.

clang

In order to compile RocksDB, you must have LLVM available. On debian-based linux it can be installed as follows:

On linux:

sudo apt-get install build-essential pkg-config cmake clang lldb lld

On mac:

You need to have an up-to-date Xcode. You can install it directly from App Store. With Xcode command line tools, you get the Clang compiler installed by default. Thus, having XCode you don't need to install clang.

OpenSSL

Install OpenSSL:

On mac:

brew install openssl

On linux:

sudo apt-get install libssl-dev

Rust

Install the latest rust version.

Instructions can be found on the official site.

Verify the rust installation:

rustc --version
rustc 1.xx.y (xxxxxx 20xx-yy-zz) # Output may vary depending on actual version of rust

Postgres

Install the latest postgres.

brew install postgresql

SQLx CLI

SQLx is a Rust library we use to interact with Postgres, and its CLI is used to manage DB migrations and support several features of the library.

cargo install sqlx-cli --version 0.5.13

Solidity compiler solc

Install the latest solidity compiler.

brew install solidity

Alternatively, download a precompiled version and add it to your PATH.

Python

Most environments will have this preinstalled but if not, install Python.

Easier method using nix

Nix is a tool that can fetch exactly the right dependencies specified via hashes. The current config is Linux-only but it is likely that it can be adapted to Mac.

Install nix. Enable the nix command and flakes.

Install docker, rustup and use rust to install SQLx CLI like described above. If you are on NixOS, you also need to enable nix-ld.

Go to the zksync folder and run nix develop --impure. After it finishes, you are in a shell that has all the dependencies.

Environment

Edit the lines below and add them to your shell profile file (e.g. ~/.bash_profile, ~/.zshrc):

# Add path here:
export ZKSYNC_HOME=/path/to/zksync

export PATH=$ZKSYNC_HOME/bin:$PATH

# If you're like me, uncomment:
# cd $ZKSYNC_HOME

Tip: mold

Optionally, you may want to optimize the build time with the modern linker, mold.

This linker will speed up the build times, which can be pretty big for Rust binaries.

Follow the instructions in the repo in order to install it and enable for Rust.

Tip: Speeding up building RocksDB

By default, each time you compile rocksdb crate, it will compile required C++ sources from scratch. It can be avoided by using precompiled versions of library, and it will significantly improve your build times.

In order to do so, you can put compiled libraries to some persistent location, and add the following to your shell configuration file (e.g. .zshrc or .bashrc):

export ROCKSDB_LIB_DIR=<library location>
export SNAPPY_LIB_DIR=<library location>

Make sure that compiled libraries match the current version of RocksDB. One way to obtain them, is to compile the project in the usual way once, and then take built libraries from target/{debug,release}/build/librocksdb-sys-{some random value}/out.