What is gVisor?
gVisor is an application kernel, written in Go, that implements a
substantial portion of the Linux system surface. It includes an
Open Container Initiative (OCI) runtime called
runsc that provides an
isolation boundary between the application and the host kernel. The
runtime integrates with Docker and Kubernetes, making it simple to run sandboxed
Why does gVisor exist?
Containers are not a sandbox. While containers have revolutionized how we develop, package, and deploy applications, using them to run untrusted or potentially malicious code without additional isolation is not a good idea. While using a single, shared kernel allows for efficiency and performance gains, it also means that container escape is possible with a single vulnerability.
gVisor is an application kernel for containers. It limits the host kernel surface accessible to the application while still giving the application access to all the features it expects. Unlike most kernels, gVisor does not assume or require a fixed set of physical resources; instead, it leverages existing host kernel functionality and runs as a normal process. In other words, gVisor implements Linux by way of Linux.
gVisor should not be confused with technologies and tools to harden containers against external threats, provide additional integrity checks, or limit the scope of access for a service. One should always be careful about what data is made available to a container.
User documentation and technical architecture, including quick start guides, can be found at gvisor.dev.
Installing from source
gVisor builds on x86_64 and ARM64. Other architectures may become available in the future.
Make sure the following dependencies are installed:
Build and install the
make runsc sudo cp ./bazel-bin/runsc/linux_amd64_pure_stripped/runsc /usr/local/bin
To run standard test suites, you can use:
make unit-tests make tests
To run specific tests, you can specify the target:
make test TARGETS="//runsc:version_test"
This project uses bazel to build and manage dependencies. A synthetic
go branch is maintained that is compatible with standard
go tooling for
For example, to build and install
runsc directly from this branch:
echo "module runsc" > go.mod GO111MODULE=on go get gvisor.dev/gvisor/runsc@go CGO_ENABLED=0 GO111MODULE=on sudo -E go build -o /usr/local/bin/runsc gvisor.dev/gvisor/runsc
Subsequently, you can build and install the shim binary for
GO111MODULE=on sudo -E go build -o /usr/local/bin/containerd-shim-runsc-v1 gvisor.dev/gvisor/shim
Note that this branch is supported in a best effort capacity, and direct
development on this branch is not supported. Development should occur on the
master branch, which is then reflected into the
Community & Governance
See GOVERNANCE.md for project governance information.