掌握SR-IOV CNI插件:构建与网络配置指南

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资源摘要信息:"sriov-cni:SR-IOV CNI插件详细解读" SR-IOV(Single Root I/O Virtualization)是Intel提出的一种I/O虚拟化技术,旨在提供接近物理硬件性能的虚拟机网络访问能力。SR-IOV技术允许单个物理网络接口卡(NIC)被虚拟化为多个虚拟功能(VF),每个VF可以被分配给虚拟机(VM)使用,从而允许虚拟机拥有自己的MAC地址和网络配置,实现与物理机类似的网络性能。 CNI(Container Network Interface)是Kubernetes用来配置容器网络的一套标准接口,通过CNI插件可以在容器运行时为容器配置网络资源。sriov-cni是专门为了利用SR-IOV技术特性而开发的CNI插件,它可以让容器通过SR-IOV的VF来获得网络连接。 为了构建sriov-cni插件,开发者需要具备Go语言的知识,因为该插件是使用Go语言开发的。构建sriov-cni插件需要Go 1.5或更高版本,而使用Go 1.5的用户需要在环境变量中设置GO15VENDOREXPERIMENT=1以支持模块依赖管理。这是因为在Go 1.6及以后的版本中,该标志默认是设置的。 在CentOS、Fedora或RHEL系统上启用SR-IOV时,需要对Intel ixgbe网络驱动进行配置,通过修改/etc/modprobe.conf文件中的配置项来设置ixgbe驱动的最大VF数量。例如,设置max_vfs=8,8意味着为主机网卡配置了两个物理功能(PF)和16个虚拟功能(VF)。 网络配置方面,sriov-cni插件在配置网络时需要提供特定的参数。其中,name是网络的名称,type是插件类型,在这里必须指定为“sriov”。master字段指的是PF的名称,即要被虚拟化的物理网卡的标识。 使用sriov-cni插件,用户可以让容器通过SR-IOV技术获得高效且接近原生物理性能的网络访问能力,这对于需要高性能网络通信的场景尤其重要。例如,在云计算环境中,利用SR-IOV技术可以让虚拟机获得更优的网络性能,从而提升整个系统的网络吞吐量和减少延迟。 在构建和部署sriov-cni插件时,需要注意的几点包括: 1. 构建环境需满足Go语言版本要求。 2. 需要正确配置SR-IOV相关的硬件和操作系统设置。 3. 在网络配置文件中正确填写sriov-cni插件所需的关键参数。 综上所述,sriov-cni插件为容器化环境提供了高效利用网络资源的能力,使得容器可以通过SR-IOV技术直接访问物理网络接口卡,从而达到降低网络延迟、提高吞吐量的效果,对于希望最大化网络性能的用户来说,sriov-cni是一个非常有价值的解决方案。

Another example is the SRIOV_NET_VF resource class, which is provided by SRIOV-enabled network interface cards. In the case of multiple SRIOV-enabled NICs on a compute host, different qualitative traits may be tagged to each NIC. For example, the NIC called enp2s0 might have a trait “CUSTOM_PHYSNET_PUBLIC” indicating that the NIC is attached to a physical network called “public”. The NIC enp2s1 might have a trait “CUSTOM_PHYSNET_INTRANET” that indicates the NIC is attached to the physical network called “Intranet”. We need a way of representing that these NICs each provide SRIOV_NET_VF resources but those virtual functions are associated with different physical networks. In the resource providers data modeling, the entity which is associated with qualitative traits is the resource provider object. Therefore, we require a way of representing that the SRIOV-enabled NICs are themselves resource providers with inventories of SRIOV_NET_VF resources. Those resource providers are contained on a compute host which is a resource provider that has inventory records for other types of resources such as VCPU, MEMORY_MB or DISK_GB. This spec proposes that nested resource providers be created to allow for distinguishing details of complex components of some resource providers. During review the question came up about “rolling up” amounts of these nested providers to the root level. Imagine this scenario: I have a NIC with two PFs, each of which has only 1 VF available, and I get a request for 2 VFs without any traits to distinguish them. Since there is no single resource provider that can satisfy this request, it will not select this root provider, even though the root provider “owns” 2 VFs. This spec does not propose any sort of “rolling up” of inventory, but this may be something to consider in the future. If it is an idea that has support, another BP/spec can be created then to add this behavior.

2023-07-23 上传