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.
You can see iSulad
architecture in architecture.
iSulad
support multiple container runtimes, including lxc、runc and kata.
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 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 start secure containers with lightweight virtual machines.
iSulad
supports multiple image formats, including OCI and external rootfs.
OCI is a docker-compatible image format that supports pulling images and running containers from remote image repositories.
External rootfs allows users to prepare a bootable root fs
directory, which is mainly used in system container scenarios.
iSulad
provides two different interfaces for image and container management operations: CLI and CRI.
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 (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.
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 the container image registry address, for example "docker.io" or other registry addrss.
# cat /etc/isulad/daemon.json
.....
"registry-mirrors": [
"docker.io"
],
.....
iSulad
provides two ways to start the isulad:
systemd
service to start iSulad
:# restart the server with systemd command
$ systemctl restart isulad
iSulad
:# run the server with default socket name and default log level and images manage function
$ sudo isulad
iSulad
provides two operation interfaces for managing images and containers: CLI and CRI.
CLI, iSulad
provides isula
as client CLI
Here are some sample commands to manager containers.
$ sudo isula ps -a
Create a container with busybox:
test
with default runtime:$ sudo isula create -t -n test busybox
testrunc
with runc runtime:$ sudo isula create -t --runtime runc -n testrunc busybox
Start this container test
:
$ sudo isula start test
test
:$ sudo isula kill test
test
:$ sudo isula rm test
iSulad
can be integrated with kubernetes through the CRI interface. For integrating with kubernetes, please refer to k8s_integration.
Using ptcr as a performance test tool , it shows the performance of iSulad
in computers with different architectures.
iSula
, docker
, podman
is as follows:iSula
, docker
, podman
is as follows:iSula
, docker
, podman
is as follows:iSula
, docker
, podman
is as follows:More information can get from: Performance test
iSulad
runs on Kernels above 3.0.x.
The standard specification versions that iSulad
is compatible with are as follows:
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 |
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