From a3c77a00284506e7290ac20566825b120fc87683 Mon Sep 17 00:00:00 2001
From: yixin21 <66355657+yixin21@users.noreply.github.com>
Date: Sat, 1 Aug 2020 19:29:21 +0800
Subject: [PATCH] Create 2018-10-01-health-checking-grpc.md

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+---
+layout: blog
+title:  '在 Kubernetes 上运行状况检查 gRPC 服务器'
+date: 2018-10-01
+---
+<!--
+---
+layout: blog
+title:  'Health checking gRPC servers on Kubernetes'
+date: 2018-10-01
+---
+--->
+
+<!--
+**Author**: [Ahmet Alp Balkan](https://twitter.com/ahmetb) (Google)
+--->
+**作者**： [Ahmet Alp Balkan](https://twitter.com/ahmetb) (Google)
+
+<!--
+[gRPC](https://grpc.io) is on its way to becoming the lingua franca for
+communication between cloud-native microservices. If you are deploying gRPC
+applications to Kubernetes today, you may be wondering about the best way to
+configure health checks. In this article, we will talk about
+[grpc-health-probe](https://github.com/grpc-ecosystem/grpc-health-probe/), a
+Kubernetes-native way to health check gRPC apps.
+--->
+[gRPC](https://grpc.io) 将成为本地云微服务间进行通信的通用语言。如果您今天将 gRPC 应用程序部署到 Kubernetes，您可能会想要了解配置运行状况检查的最佳方法。在本文中，我们将介绍 [grpc-health-probe](https://github.com/grpc-ecosystem/grpc-health-probe/)，这是 Kubernetes 原生的健康状况检查 gRPC 应用程序的方法。
+
+<!--
+If you're unfamiliar, Kubernetes [health
+checks](/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)
+(liveness and readiness probes) is what's keeping your applications available
+while you're sleeping. They detect unresponsive pods, mark them unhealthy, and
+cause these pods to be restarted or rescheduled.
+--->
+如果您不熟悉，Kubernetes的 [健康状况检查](/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)（活动性和就绪性探测器）可以使您的应用程序在睡眠时保持可用状态。当检测到没有回应的 Pod 时，会将其标记为不健康，并使这些 Pod 重新启动或重新安排。
+
+<!--
+Kubernetes [does not
+support](https://github.com/kubernetes/kubernetes/issues/21493) gRPC health
+checks natively. This leaves the gRPC developers with the following three
+approaches when they deploy to Kubernetes:
+
+[![options for health checking grpc on kubernetes today](/images/blog/2019-09-30-health-checking-grpc/options.png)](/images/blog/2019-09-30-health-checking-grpc/options.png)
+--->
+Kubernetes 原本 [不支持](https://github.com/kubernetes/kubernetes/issues/21493) gRPC 健康检查。gRPC 的开发人员在 Kubernetes 中部署时可以采用以下三种方法：
+
+[![今日在 kubernetes 上进行健康状况检查 gRPC的选项](/images/blog/2019-09-30-health-checking-grpc/options.png)](/images/blog/2019-09-30-health-checking-grpc/options.png)
+
+
+<!--
+1.  **httpGet probe:** Cannot be natively used with gRPC. You need to refactor
+    your app to serve both gRPC and HTTP/1.1 protocols (on different port
+    numbers).
+2.  **tcpSocket probe:** Opening a socket to gRPC server is not meaningful,
+    since it cannot read the response body.
+3.  **exec probe:** This invokes a program in a container's ecosystem
+    periodically. In the case of gRPC, this means you implement a health RPC
+    yourself, then write and ship a client tool with your container.
+
+Can we do better? Absolutely.
+--->
+1.  **httpGet prob：** 不能与 gRPC 一起使用。您需要重构您的应用程序，必须同时支持 gRPC 和 HTTP/1.1 协议（在不同的端口号上）。
+2.  **tcpSocket probe：** 打开 gRPC 服务器的 Socket 是没有意义的，因为它无法读取响应主体。
+3.  **exec probe：** 将定期调用容器生态系统中的程序。对于 gRPC，这意味着您要自己实现运行健康状况 RPC，然后使用容器编写并交付客户端工具。
+
+我们可以做得更好吗？这是肯定的。
+
+<!--
+## Introducing “grpc-health-probe”
+
+To standardize the "exec probe" approach mentioned above, we need:
+
+- a **standard** health check "protocol" that can be implemented in any gRPC
+  server easily.
+- a **standard** health check "tool" that can query the health protocol easily.
+--->
+## 介绍 “grpc-health-probe”
+
+为了使上述 "exec probe" 方法标准化，我们需要：
+
+- 可以在任何 gRPC 服务器中轻松实现的 **标准** 健康状态检查 "协议" 。
+- 一种 **标准** 健康状态检查 "工具" ，可以轻松查询健康协议。
+
+<!--
+Thankfully, gRPC has a [standard health checking
+protocol](https://github.com/grpc/grpc/blob/v1.15.0/doc/health-checking.md). It
+can be used easily from any language. Generated code and the utilities for
+setting the health status are shipped in nearly all language implementations of
+gRPC.
+--->
+幸运的是，gRPC 具有 [标准的健康状况检查协议](https://github.com/grpc/grpc/blob/v1.15.0/doc/health-checking.md)。可以用任何语言轻松调用它。几乎所有实现 gRPC 的语言都附带了生成的代码和用于设置健康状态的实用程序。
+
+<!--
+If you
+[implement](https://github.com/grpc/grpc/blob/v1.15.0/src/proto/grpc/health/v1/health.proto)
+this health check protocol in your gRPC apps, you can then use a standard/common
+tool to invoke this `Check()` method to determine server status.
+--->
+如果您在 gRPC 应用程序中 [实现](https://github.com/grpc/grpc/blob/v1.15.0/src/proto/grpc/health/v1/health.proto) 此健康状况检查协议，那么可以使用标准或通用工具调用 `Check()` 方法来确定服务器状态。
+
+<!--
+The next thing you need is the "standard tool", and it's the
+[**grpc-health-probe**](https://github.com/grpc-ecosystem/grpc-health-probe/).
+--->
+接下来您需要的是 "标准工具" [**grpc-health-probe**](https://github.com/grpc-ecosystem/grpc-health-probe/)。
+
+<a href='/images/blog/2019-09-30-health-checking-grpc/grpc_health_probe.png'>
+    <img width="768"  title='grpc-health-probe on kubernetes'
+        src='/images/blog/2019-09-30-health-checking-grpc/grpc_health_probe.png'/>
+</a>
+
+<!--
+With this tool, you can use the same health check configuration in all your gRPC
+applications. This approach requires you to:
+--->
+使用此工具，您可以在所有 gRPC 应用程序中使用相同的健康状况检查配置。这种方法有以下要求：
+
+<!--
+1.  Find the gRPC "health" module in your favorite language and start using it
+    (example [Go library](https://godoc.org/github.com/grpc/grpc-go/health)).
+2.  Ship the
+    [grpc_health_probe](https://github.com/grpc-ecosystem/grpc-health-probe/)
+    binary in your container.
+3.  [Configure](https://github.com/grpc-ecosystem/grpc-health-probe/tree/1329d682b4232c102600b5e7886df8ffdcaf9e26#example-grpc-health-checking-on-kubernetes)
+    Kubernetes "exec" probe to invoke the "grpc_health_probe" tool in the
+    container.
+--->
+1.  用您喜欢的语言找到 gRPC 的 "健康" 模块并开始使用它（例如 [Go 库](https://godoc.org/github.com/grpc/grpc-go/health)）。
+2.  将二进制文件 [grpc_health_probe](https://github.com/grpc-ecosystem/grpc-health-probe/) 送到容器中。
+3.  在容器中 [配置](https://github.com/grpc-ecosystem/grpc-health-probe/tree/1329d682b4232c102600b5e7886df8ffdcaf9e26#example-grpc-health-checking-on-kubernetes) Kubernetes 的 "exec" 检查模块调用 "grpc_health_probe" 工具。
+
+<!--
+In this case, executing "grpc_health_probe" will call your gRPC server over
+`localhost`, since they are in the same pod.
+--->
+在这种情况下，执行 "grpc_health_probe" 将通过 `localhost` 调用您的 gRPC 服务器，因为它们位于同一个容器中。
+
+<!--
+## What's next
+
+**grpc-health-probe** project is still in its early days and it needs your
+feedback. It supports a variety of features like communicating with TLS servers
+and configurable connection/RPC timeouts.
+--->
+## 下一步工作
+
+**grpc-health-probe** 项目仍处于初期阶段，需要您的反馈。它支持多种功能，例如与 TLS 服务器通信和配置延时连接/RPC。
+
+<!--
+If you are running a gRPC server on Kubernetes today, try using the gRPC Health
+Protocol and try the grpc-health-probe in your deployments, and [give
+feedback](https://github.com/grpc-ecosystem/grpc-health-probe/).
+--->
+如果您最近要在 Kubernetes 上运行 gRPC 服务器，请尝试使用 gRPC Health Protocol，并在您的 Deployment 中尝试 grpc-health-probe，然后 [进行反馈](https://github.com/grpc-ecosystem/grpc-health-probe/)。
+
+<!--
+## Further reading
+
+- Protocol: [GRPC Health Checking Protocol](https://github.com/grpc/grpc/blob/v1.15.0/doc/health-checking.md) ([health.proto](https://github.com/grpc/grpc/blob/v1.15.0/src/proto/grpc/health/v1/health.proto))
+- Documentation: [Kubernetes liveness and readiness probes](/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)
+- Article: [Advanced Kubernetes Health Check Patterns](https://ahmet.im/blog/advanced-kubernetes-health-checks/)
+--->
+## 更多内容
+
+- 协议： [GRPC Health Checking Protocol](https://github.com/grpc/grpc/blob/v1.15.0/doc/health-checking.md) ([health.proto](https://github.com/grpc/grpc/blob/v1.15.0/src/proto/grpc/health/v1/health.proto))
+- 文档： [Kubernetes 活跃性和就绪性检查](/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/)
+- 文章： [升级版 Kubernetes Health Check Patterns](https://ahmet.im/blog/advanced-kubernetes-health-checks/)