howieyuen
89 lines
3.7 KiB
Markdown
89 lines
3.7 KiB
Markdown
---
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title: 容器运行时接口（CRI）
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content_type: concept
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weight: 50
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---
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<!--
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title: Container Runtime Interface (CRI)
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content_type: concept
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weight: 50
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-->
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<!-- overview -->
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<!--
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The CRI is a plugin interface which enables the kubelet to use a wide variety of
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container runtimes, without having a need to recompile the cluster components.
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You need a working
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{{<glossary_tooltip text="container runtime" term_id="container-runtime">}} on
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each Node in your cluster, so that the
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{{< glossary_tooltip text="kubelet" term_id="kubelet" >}} can launch
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{{< glossary_tooltip text="Pods" term_id="pod" >}} and their containers.
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-->
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CRI 是一个插件接口，它使 kubelet 能够使用各种容器运行时，无需重新编译集群组件。
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你需要在集群中的每个节点上都有一个可以正常工作的
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{{<glossary_tooltip text="容器运行时" term_id="container-runtime">}}，
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这样
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{{< glossary_tooltip text="kubelet" term_id="kubelet" >}} 能启动
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{{< glossary_tooltip text="Pod" term_id="pod" >}} 及其容器。
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{{< glossary_definition prepend="容器运行时接口（CRI）是" term_id="container-runtime-interface" length="all" >}}
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<!-- body -->
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<!-- ## The API {#api} -->
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## API {#api}
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{{< feature-state for_k8s_version="v1.23" state="stable" >}}
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<!--
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The kubelet acts as a client when connecting to the container runtime via gRPC.
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The runtime and image service endpoints have to be available in the container
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runtime, which can be configured separately within the kubelet by using the
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`--image-service-endpoint` and `--container-runtime-endpoint` [command line
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flags](/docs/reference/command-line-tools-reference/kubelet)
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-->
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当通过 gRPC 连接到容器运行时时，kubelet 充当客户端。
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运行时和镜像服务端点必须在容器运行时中可用，可以使用
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[命令行标志](/zh-cn/docs/reference/command-line-tools-reference/kubelet)的
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`--image-service-endpoint` 和 `--container-runtime-endpoint`
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在 kubelet 中单独配置。
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<!--
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For Kubernetes v{{< skew currentVersion >}}, the kubelet prefers to use CRI `v1`.
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If a container runtime does not support `v1` of the CRI, then the kubelet tries to
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negotiate any older supported version.
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The v{{< skew currentVersion >}} kubelet can also negotiate CRI `v1alpha2`, but
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this version is considered as deprecated.
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If the kubelet cannot negotiate a supported CRI version, the kubelet gives up
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and doesn't register as a node.
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-->
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对 Kubernetes v{{< skew currentVersion >}}，kubelet 偏向于使用 CRI `v1` 版本。
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如果容器运行时不支持 CRI 的 `v1` 版本，那么 kubelet 会尝试协商任何旧的其他支持版本。
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如果 kubelet 无法协商支持的 CRI 版本，则 kubelet 放弃并且不会注册为节点。
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<!--
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## Upgrading
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When upgrading Kubernetes, then the kubelet tries to automatically select the
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latest CRI version on restart of the component. If that fails, then the fallback
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will take place as mentioned above. If a gRPC re-dial was required because the
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container runtime has been upgraded, then the container runtime must also
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support the initially selected version or the redial is expected to fail. This
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requires a restart of the kubelet.
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-->
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## 升级 {#upgrading}
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升级 Kubernetes 时，kubelet 会尝试在组件重启时自动选择最新的 CRI 版本。
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如果失败，则将如上所述进行回退。如果由于容器运行时已升级而需要 gRPC 重拨，
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则容器运行时还必须支持最初选择的版本，否则重拨预计会失败。
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这需要重新启动 kubelet。
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## {{% heading "whatsnext" %}}
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<!--
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- Learn more about the CRI [protocol definition](https://github.com/kubernetes/cri-api/blob/c75ef5b/pkg/apis/runtime/v1/api.proto)
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-->
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- 了解更多有关 CRI [协议定义](https://github.com/kubernetes/cri-api/blob/c75ef5b/pkg/apis/runtime/v1/api.proto)
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