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cloud-hypervisor/docs/building.md

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Building Cloud Hypervisor

We recommend users use the pre-built binaries that are mentioned in the README.md file in the root of the repository. Building from source is only necessary if you wish to make modifications.

Preparation

We create a folder to build and run cloud-hypervisor at $HOME/cloud-hypervisor

$ export CLOUDH=$HOME/cloud-hypervisor
$ mkdir $CLOUDH

Install prerequisites

You need to install some prerequisite packages in order to build and test Cloud Hypervisor. Here, all the steps are based on Ubuntu, for other Linux distributions please replace the package manager and package name.

# Install basic packages needed. For a package list targeting for more
# functionalities for example the test, please see resources/Dockerfile.
$ sudo apt-get update
$ sudo apt install git build-essential m4 bison flex uuid-dev qemu-utils musl-tools
# Install rust tool chain
$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
# If you want to build statically linked binary please add musl target
$ rustup target add x86_64-unknown-linux-musl  # x86-64
$ rustup target add aarch64-unknown-linux-musl # AArch64

Clone and build

First you need to clone and build the Cloud Hypervisor repository:

$ pushd $CLOUDH
$ git clone https://github.com/cloud-hypervisor/cloud-hypervisor.git
$ cd cloud-hypervisor
$ cargo build --release

# We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
$ sudo setcap cap_net_admin+ep ./target/release/cloud-hypervisor

# If you want to build statically linked binary
$ cargo build --release --target=x86_64-unknown-linux-musl --all  # x86-64
$ cargo build --release --target=aarch64-unknown-linux-musl --all # AArch64
$ popd

This will build a cloud-hypervisor binary under $CLOUDH/cloud-hypervisor/target/release/cloud-hypervisor.

Containerized builds and tests

If you want to build and test Cloud Hypervisor without having to install all the required dependencies (The rust toolchain, cargo tools, etc), you can also use Cloud Hypervisor's development script: dev_cli.sh. Please note that upon its first invocation, this script will pull a fairly large container image.

For example, to build the Cloud Hypervisor release binary:

$ pushd $CLOUDH
$ cd cloud-hypervisor
$ ./scripts/dev_cli.sh build --release

With dev_cli.sh, one can also run the Cloud Hypervisor CI locally. This can be very convenient for debugging CI errors without having to fully rely on the Cloud Hypervisor CI infrastructure.

For example, to run the Cloud Hypervisor unit tests:

$ ./scripts/dev_cli.sh tests --unit

Run the ./scripts/dev_cli.sh --help command to view all the supported development script commands and their related options.