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Introduction

iSulad , written in C/C++, is a lightweight container engine that has the advantage of being light, fast and applicable to multiple hardware specifications and architecture. iSulad has a wide application prospect.

Architecture

You can see iSulad architecture in architecture.

Function

Runtime

iSulad support multiple container runtimes, including lxc、runc and kata.

lxc

lxc is an open-source container runtime written in C , which occupies less resources and is suitable for scenarios with high restrictions on noise floor resources. It is the default runtime of iSulad.

runc

runc is an OCI-compliant runtime written in GO. When users use runc, the OCI runtime-spec version is required to be at least 1.0.0.

kata-runtime

kata-runtime start secure containers with lightweight virtual machines.

Image

iSulad supports multiple image formats, including OCI and external rootfs.

OCI

OCI is a docker-compatible image format that supports pulling images and running containers from remote image repositories.

external rootfs

External rootfs allows users to prepare a bootable root fs directory, which is mainly used in system container scenarios.

Operation Interface

iSulad provides two different interfaces for image and container management operations: CLI and CRI.

CLI

CLI uses the command line to manage images and containers. It is a standard C/S architecture model. iSula performs as an independent command line client that talks to the iSulad daemon.

The commands provided by iSula cover most of the common application scenarios, including the operation interface of the container, such as run, stop, rm, pause, etc, as well as the related operations of the image, such as pull, import, rmi, etc.

CRI

CRI (Container Runtime Interface) implementer can work seamlessly with K8s.

CRI interface is implemented based on gRPC. iSulad implemented CRI gRPC Server following CRI interface standards. CRI gRPC Server includes runtime service and image service, which are used to provide container runtime interface and image operation interface respectively. CRI gRPC Server listen on a local unix socket, and the K8s component kubelet runs as a gRPC Client.

Getting Started

• usage guide: openeuler official manual

• development guide

• user manual

• design docs

Installing

To install iSulad, you can use yum package manager command with openEuler repository.

Or write repository file by hand:

$ cat << EOF > /etc/yum.repos.d/openEuler.repo
[openEuler]
baseurl=https://repo.openeuler.org/openEuler-22.03-LTS/OS/\$basearch
enabled=1
EOF

Install iSulad with yum:

$ yum install -y iSulad

if you found this error

Repository 'openEuler' is missing name in configuration, using id.

You have enabled checking of packages via GPG keys. This is a good thing.
However, you do not have any GPG public keys installed. You need to download
the keys for packages you wish to install and install them.
You can do that by running the command:
    rpm --import public.gpg.key


Alternatively you can specify the url to the key you would like to use
for a repository in the 'gpgkey' option in a repository section and YUM
will install it for you.

For more information contact your distribution or package provider.

you should run rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-openEuler first.

Configure

Configure the container image registry address, for example "docker.io" or other registry addrss.

# cat /etc/isulad/daemon.json
.....
    "registry-mirrors": [
        "docker.io"
    ],
.....

Run

iSulad provides two ways to start the isulad:

1. Use systemd service to start iSulad:

# restart the server with systemd command
$ systemctl restart isulad 

2. Use direct command to start iSulad:

# run the server with default socket name and default log level and images manage function
$ sudo isulad 

Operations on containers

iSulad provides two operation interfaces for managing images and containers: CLI and CRI.

CLI

CLI, iSulad provides isula as client CLI

Here are some sample commands to manager containers.

• List all containers in your own environment:

$ sudo isula ps -a

• Create a container with busybox:

  • You can create container test with default runtime:

  $ sudo isula create -t -n test busybox

  • You also can create container testrunc with runc runtime:

  $ sudo isula create -t --runtime runc -n testrunc busybox

• Start this container test:

$ sudo isula start test

• Kill the container test:

$ sudo isula kill test

• Remove the container test:

$ sudo isula rm test

CRI

iSulad can be integrated with kubernetes through the CRI interface. For integrating with kubernetes, please refer to k8s_integration.

Performance

Using ptcr as a performance test tool , it shows the performance of iSulad in computers with different architectures.

ARM

• For searially with 10 containers, the performance radar chart of iSula, docker, podman is as follows:

• For parallerlly with 100 containers, the performance radar chart of iSula, docker, podman is as follows:

X86

• For searially with 10 containers, the performance radar chart of iSula, docker, podman is as follows:

• For parallerlly with 100 containers, the performance radar chart of iSula, docker, podman is as follows:

More information can get from: Performance test

Kernel Requirements

iSulad runs on Kernels above 3.0.x.

Compatibility

The standard specification versions that iSulad is compatible with are as follows:

• Compatible with OCI 1.0.0.
• Compatible with CNI 0.3.0 - 1.0.0, iSulad supports CNI 1.0.0 from 2.1.4 version.
• Compatible with lcr 2.1.x and above.

Kubernetes Support

iSulad supports Kubernetes version 1.13 and above. The following table shows the compatibility between iSulad and Kubernetes. It lists the minimum iSulad version required for some given Kubernetes versions.

iSulad Version	Kubernetes Version	CRI Version
v2.0.0+	v1.13-v1.18	v1alpha2
v2.0.8+	v1.19-v1.22	v1alpha2
v2.1.4+	v1.23-v1.29	v1, v1alpha2