Quick Start

This user guide provides the steps to run Occlum with Docker and OCI Runtime rune.

rune is a novel OCI Runtime used to run trusted applications in containers with the hardware-assisted enclave technology.

Occlum is a memory-safe, multi-process library OS for Intel SGX.


  • Ensure that you have one of the following required operating systems to build a Occlum container image:

    • CentOS 8.1
    • Ubuntu 18.04-server
  • Please follow Intel SGX Installation Guide to install Intel SGX driver, Intel SGX SDK & PSW for Linuxw.

    • For CentOS 8.1, UAE service libraries are needed but may not installed if SGX PSW installer is used. Please manually install it:

      rpm -i libsgx-uae-service-
      • Install enable_rdfsbase kernel module, allowing to use FSGSBASE instructions in Occlum.

      • Install rune and occlum-pal from Inclavare Container release page.

      • For CentOS 8.1:

      • Add the repository to your sources.

        cat >/etc/yum.repos.d/inclavare-containers.repo <<EOF

    1. Install the RPM packages.

      yum install rune occlum-pal
      • For Ubuntu 18.04-server:
      • Add the repository to your sources. shell echo 'deb [arch=amd64] https://mirrors.openanolis.org/inclavare-containers/deb-repo bionic main' | tee /etc/apt/sources.list.d/inclavare-containers.list
    2. Add the key to the list of trusted keys used by the apt to authenticate packages.

      wget -qO - https://mirrors.openanolis.org/inclavare-containers/deb-repo/DEB-GPG-KEY.key | apt-key add -
      1. Update the apt and install the packages. shell apt-get update apt-get install rune occlum-pal

Building Occlum container image

Launch Occlum SDK container image

mkdir "$HOME/rune_workdir"
docker run -it --privileged --device /dev/isgx \
  -v "$HOME/rune_workdir":/root/rune_workdir \

Prepare “hello world” demo program

This tutorial can help you to create your first occlum build.

Assuming “hello world” demo program is built, execute the following command:

cp -a occlum_instance /root/rune_workdir

Create Occlum container image

Now you can build your occlum container image in the $HOME/rune_workdir directory of your host system.

Type the following commands to create a Dockerfile:

cd "$HOME/rune_workdir"
cat >Dockerfile <<EOF
FROM centos:8.1.1911

RUN mkdir -p /run/rune/occlum_instance
WORKDIR /run/rune

COPY occlum_instance occlum_instance

ENTRYPOINT ["/bin/hello_world"]

then build the Occlum container image with the command:

docker build . -t occlum-app

Configuring OCI Runtime rune for Docker

Add the assocated configuration for rune in dockerd config file, e.g, /etc/docker/daemon.json, on your system.

    "runtimes": {
        "rune": {
            "path": "/usr/bin/rune",
            "runtimeArgs": []

then restart dockerd on your system.

You can check whether rune is correctly enabled or not with:

docker info | grep rune

The expected result would be:

Runtimes: rune runc

Running Occlum container image

You need to specify a set of parameters to docker run to run:

docker run -it --rm --runtime=rune \
  -e ENCLAVE_TYPE=intelSgx \
  -e ENCLAVE_RUNTIME_PATH=/opt/occlum/build/lib/libocclum-pal.so \
  -e ENCLAVE_RUNTIME_ARGS=occlum_instance \

@ENCLAVE_TYPE: specify the type of enclave hardware to use, such as intelSgx.
@ENCLAVE_PATH: specify the path to enclave runtime PAL to launch.
@ENCLAVE_ARGS: specify the specific arguments to enclave runtime PAL, separated by the comma.