Quick Start: running Occlum with OCI runtime rune

This user guide provides the steps to run Occlum with 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.

Requirements

Ensure that you have one of the following required operating systems to build an Occlum container image:
- CentOS 8.2
- Ubuntu 18.04-server
Please follow Intel SGX Installation Guide to install Intel SGX driver, Intel SGX SDK & PSW for Linux.
- For CentOS 8.2, UAE service libraries are needed but may not be installed if SGX PSW installer is used. Please manually install it:
```
yum install libsgx-uae-service
```
Install enable_rdfsbase kernel module, allowing to use FSGSBASE instructions in Occlum. Please skip this step when using kernel 5.9. Note that you are not able to run Occlum with kernel disabled FSGSBASE feature even you have installed this module.

Install rune and occlum.

For CentOS 8.2:

Add the repository to your sources.

cat >/etc/yum.repos.d/inclavare-containers.repo <<EOF
[inclavare-containers]
name=inclavare-containers
enabled=1
baseurl=https://mirrors.openanolis.org/inclavare-containers/rpm-repo/
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.openanolis.org/inclavare-containers/rpm-repo/RPM-GPG-KEY-rpm-sign
gpgcakey=https://mirrors.openanolis.org/inclavare-containers/rpm-repo/RPM-GPG-KEY-rpm-sign-ca
EOF

Install the RPM packages.

sudo yum install -y rune occlum
source /etc/profile

For Ubuntu 18.04-server:

Add the repository to your sources.

echo 'deb [arch=amd64] https://mirrors.openanolis.org/inclavare-containers/deb-repo bionic main' | tee /etc/apt/sources.list.d/inclavare-containers.list

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 | sudo apt-key add -

Update the apt and install the packages.

sudo apt-get update
sudo apt-get install -y rune occlum
source /etc/profile

Building Occlum container image

Prepare "hello world" demo program

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

Assuming the "hello world" demo program in occlum_instance directory is built.

Type the following commands to generate a minimal, self-contained package (.tar.gz) for the Occlum instance.

cd occlum_instance
occlum package occlum_instance.tar.gz

Create Occlum container image

Now you can build your occlum container image in occlum_instance directory on your host system.

Type the following commands to create a Dockerfile:

cat >Dockerfile <<EOF
FROM centos:8.2.2004

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

ADD occlum_instance.tar.gz /run/rune

ENTRYPOINT ["/bin/hello_world"]
EOF

then build the Occlum container image with the command:

docker build . -t occlum-app

Configuring OCI Runtime rune for Docker

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

{
	"runtimes": {
		"rune": {
			"path": "/usr/local/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 \
  occlum-app

where:

@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.

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