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Expand Up @@ -14,30 +14,34 @@ source: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
title: "Example: Deploying PHP Guestbook application with Redis"
reviewers:
- ahmetb
- jimangel
content_type: tutorial
weight: 20
card:
name: tutorials
weight: 30
title: "Stateless Example: PHP Guestbook with Redis"
min-kubernetes-server-version: v1.14
source: https://cloud.google.com/kubernetes-engine/docs/tutorials/guestbook
-->

<!-- overview -->

<!--
This tutorial shows you how to build and deploy a simple _(not production ready)_, multi-tier web application using Kubernetes and [Docker](https://www.docker.com/). This example consists of the following components:
This tutorial shows you how to build and deploy a simple _(not production
ready)_, multi-tier web application using Kubernetes and
[Docker](https://www.docker.com/). This example consists of the following
components:
-->
本教程向你展示如何使用 Kubernetes 和 [Docker](https://www.docker.com/)
构建和部署一个简单的 **(非面向生产的)** 多层 web 应用程序。本例由以下组件组成：
构建和部署一个简单的 **(非面向生产的)** 多层 Web 应用程序。本例由以下组件组成：

<!--
* A single-instance [Redis](https://www.redis.io/) to store guestbook entries
* Multiple web frontend instances
-->

* 单实例 [Redis](https://www.redis.io/) 以保存留言板条目
* 多个 web 前端实例
* 多个 Web 前端实例

## {{% heading "objectives" %}}

Expand All @@ -64,7 +68,7 @@ This tutorial shows you how to build and deploy a simple _(not production ready)
<!--
## Start up the Redis Database
-->
## 启动 Redis 数据库
## 启动 Redis 数据库 {#start-up-the-redis-database}

<!--
The guestbook application uses Redis to store its data.
Expand All @@ -74,7 +78,7 @@ The guestbook application uses Redis to store its data.
<!--
### Creating the Redis Deployment
-->
### 创建 Redis Deployment
### 创建 Redis Deployment {#creating-the-redis-deployment}

<!--
The manifest file, included below, specifies a Deployment controller that runs a single replica Redis Pod.
Expand Down Expand Up @@ -130,10 +134,13 @@ The manifest file, included below, specifies a Deployment controller that runs a
<!--
### Creating the Redis leader Service
-->
### 创建 Redis 领导者服务
### 创建 Redis 领导者服务 {#creating-the-redis-leader-service}

<!--
The guestbook application needs to communicate to the Redis to write its data. You need to apply a [Service](/docs/concepts/services-networking/service/) to proxy the traffic to the Redis Pod. A Service defines a policy to access the Pods.
The guestbook application needs to communicate to the Redis to write its data.
You need to apply a [Service](/docs/concepts/services-networking/service/) to
proxy the traffic to the Redis Pod. A Service defines a policy to access the
Pods.
-->
留言板应用程序需要往 Redis 中写数据。因此，需要创建
[Service](/zh-cn/docs/concepts/services-networking/service/) 来转发 Redis Pod
Expand Down Expand Up @@ -169,34 +176,37 @@ The guestbook application needs to communicate to the Redis to write its data. Y
-->
响应应该与此类似：

```shell
```
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 1m
redis-leader ClusterIP 10.103.78.24 <none> 6379/TCP 16s
```

{{< note >}}
<!--
This manifest file creates a Service named `redis-leader` with a set of labels that match the labels previously defined, so the Service routes network traffic to the Redis Pod.
This manifest file creates a Service named `redis-leader` with a set of labels
that match the labels previously defined, so the Service routes network
traffic to the Redis Pod.
-->
{{< note >}}
这个清单文件创建了一个名为 `redis-leader` 的 Service，其中包含一组
与前面定义的标签匹配的标签，因此服务将网络流量路由到 Redis Pod 上。
{{< /note >}}

<!--
### Set up Redis followers
Although the Redis leader is a single Pod, you can make it highly available and meet traffic demands by adding a few Redis followers, or replicas.
Although the Redis leader is a single Pod, you can make it highly available
and meet traffic demands by adding a few Redis followers, or replicas.
-->
### 设置 Redis 跟随者
### 设置 Redis 跟随者 {#set-up-redis-followers}

尽管 Redis 领导者只有一个 Pod，你可以通过添加若干 Redis 跟随者来将其配置为高可用状态，
以满足流量需求。

{{< codenew file="application/guestbook/redis-follower-deployment.yaml" >}}

<!--
1. Apply the Redis Service from the following `redis-follower-deployment.yaml` file:
1. Apply the Redis Deployment from the following `redis-follower-deployment.yaml` file:
-->
1. 应用下面的 `redis-follower-deployment.yaml` 文件创建 Redis Deployment：

Expand Down Expand Up @@ -233,9 +243,11 @@ Although the Redis leader is a single Pod, you can make it highly available and
<!--
### Creating the Redis follower service
The guestbook application needs to communicate with the Redis followers to read data. To make the Redis followers discoverable, you must set up another [Service](/docs/concepts/services-networking/service/).
The guestbook application needs to communicate with the Redis followers to
read data. To make the Redis followers discoverable, you must set up another
[Service](/docs/concepts/services-networking/service/).
-->
### 创建 Redis 跟随者服务
### 创建 Redis 跟随者服务 {#creating-the-redis-follower-service}

Guestbook 应用需要与 Redis 跟随者通信以读取数据。
为了让 Redis 跟随者可被发现，你必须创建另一个
Expand Down Expand Up @@ -280,23 +292,30 @@ Guestbook 应用需要与 Redis 跟随者通信以读取数据。

{{< note >}}
<!--
This manifest file creates a Service named `redis-follower` with a set of labels that match the labels previously defined, so the Service routes network traffic to the Redis Pod.
This manifest file creates a Service named `redis-follower` with a set of
labels that match the labels previously defined, so the Service routes network
traffic to the Redis Pod.
-->
清单文件创建了一个名为 `redis-follower` 的 Service，该 Service
具有一些与之前所定义的标签相匹配的标签，因此该 Service 能够将网络流量
路由到 Redis Pod 之上。
具有一些与之前所定义的标签相匹配的标签，因此该 Service 能够将网络流量路由到
Redis Pod 之上。
{{< /note >}}


<!--
## Set up and Expose the Guestbook Frontend
-->
## 设置并公开留言板前端
## 设置并公开留言板前端 {#set-up-and-expose-the-guestbook-frontend}

<!--
Now that you have the Redis storage of your guestbook up and running, start the guestbook web servers. Like the Redis followers, the frontend is deployed using a Kubernetes Deployment.
Now that you have the Redis storage of your guestbook up and running, start
the guestbook web servers. Like the Redis followers, the frontend is deployed
using a Kubernetes Deployment.
The guestbook app uses a PHP frontend. It is configured to communicate with either the Redis follower or leader Services, depending on whether the request is a read or a write. The frontend exposes a JSON interface, and serves a jQuery-Ajax-based UX.
The guestbook app uses a PHP frontend. It is configured to communicate with
either the Redis follower or leader Services, depending on whether the request
is a read or a write. The frontend exposes a JSON interface, and serves a
jQuery-Ajax-based UX.
-->
现在你有了一个为 Guestbook 应用配置的 Redis 存储处于运行状态，
接下来可以启动 Guestbook 的 Web 服务器了。
Expand All @@ -309,7 +328,7 @@ Guestbook 应用使用 PHP 前端。该前端被配置成与后端的 Redis 跟
<!--
### Creating the Guestbook Frontend Deployment
-->
### 创建 Guestbook 前端 Deployment
### 创建 Guestbook 前端 Deployment {#creating-the-guestbook-frontend-deployment}

{{< codenew file="application/guestbook/frontend-deployment.yaml" >}}

Expand Down Expand Up @@ -351,31 +370,37 @@ Guestbook 应用使用 PHP 前端。该前端被配置成与后端的 Redis 跟
<!--
### Creating the Frontend Service
-->
### 创建前端服务
### 创建前端服务 {#creating-the-frontend-service}

<!--
The `Redis` Services you applied is only accessible within the Kubernetes cluster because the default type for a Service is [ClusterIP](/docs/concepts/services-networking/service/#publishing-services-service-types). `ClusterIP` provides a single IP address for the set of Pods the Service is pointing to. This IP address is accessible only within the cluster.
The `Redis` Services you applied is only accessible within the Kubernetes
cluster because the default type for a Service is
[ClusterIP](/docs/concepts/services-networking/service/#publishing-services-service-types).
`ClusterIP` provides a single IP address for the set of Pods the Service is
pointing to. This IP address is accessible only within the cluster.
-->
应用的 `Redis` 服务只能在 Kubernetes 集群中访问，因为服务的默认类型是
[ClusterIP](/zh-cn/docs/concepts/services-networking/service/#publishing-services-service-types)。
`ClusterIP` 为服务指向的 Pod 集提供一个 IP 地址。这个 IP 地址只能在集群中访问。

<!--
If you want guests to be able to access your guestbook, you must configure the
frontend Service to be externally visible, so a client can request the Service
If you want guests to be able to access your guestbook, you must configure the
frontend Service to be externally visible, so a client can request the Service
from outside the Kubernetes cluster. However a Kubernetes user can use
`kubectl port-forward` to access the service even though it uses a
`kubectl port-forward` to access the service even though it uses a
`ClusterIP`.
-->
如果你希望访客能够访问你的 Guestbook，你必须将前端服务配置为外部可见的，
以便客户端可以从 Kubernetes 集群之外请求服务。
然而即便使用了 `ClusterIP`，Kubernetes 用户仍可以通过
`kubectl port-forward` 访问服务。

{{< note >}}
<!--
Some cloud providers, like Google Compute Engine or Google Kubernetes Engine, support external load balancers. If your cloud provider supports load balancers and you want to use it, uncomment `type: LoadBalancer`.
Some cloud providers, like Google Compute Engine or Google Kubernetes Engine,
support external load balancers. If your cloud provider supports load
balancers and you want to use it, uncomment `type: LoadBalancer`.
-->
{{< note >}}
一些云提供商，如 Google Compute Engine 或 Google Kubernetes Engine，
支持外部负载均衡器。如果你的云提供商支持负载均衡器，并且你希望使用它，
只需取消注释 `type: LoadBalancer`。
Expand Down Expand Up @@ -422,7 +447,7 @@ Some cloud providers, like Google Compute Engine or Google Kubernetes Engine, su
<!--
### Viewing the Frontend Service via `kubectl port-forward`
-->
### 通过 `kubectl port-forward` 查看前端服务
### 通过 `kubectl port-forward` 查看前端服务 {#viewing-the-frontend-service-via-kubectl-port-forward}

<!--
1. Run the following command to forward port `8080` on your local machine to port `80` on the service.
Expand All @@ -446,19 +471,18 @@ Some cloud providers, like Google Compute Engine or Google Kubernetes Engine, su
<!--
1. load the page [http://localhost:8080](http://localhost:8080) in your browser to view your guestbook.
-->
2. 在浏览器中加载 [http://localhost:8080](http://localhost:8080)
页面以查看 Guestbook。
2. 在浏览器中加载 [http://localhost:8080](http://localhost:8080) 页面以查看 Guestbook。

<!--
### Viewing the Frontend Service via `LoadBalancer`
-->
### 通过 `LoadBalancer` 查看前端服务
### 通过 `LoadBalancer` 查看前端服务 {#viewing-the-frontend-service-via-loadbalancer}

<!--
If you deployed the `frontend-service.yaml` manifest with type: `LoadBalancer` you need to find the IP address to view your Guestbook.
If you deployed the `frontend-service.yaml` manifest with type: `LoadBalancer`
you need to find the IP address to view your Guestbook.
-->
如果你部署了 `frontend-service.yaml`，需要找到用来查看 Guestbook 的
IP 地址。
如果你部署了 `frontend-service.yaml`，需要找到用来查看 Guestbook 的 IP 地址。

<!--
1. Run the following command to get the IP address for the frontend Service.
Expand Down Expand Up @@ -486,20 +510,23 @@ IP 地址。

{{< note >}}
<!--
Try adding some guestbook entries by typing in a message, and clicking Submit. The message you typed appears in the frontend. This message indicates that data is successfully added to Redis through the Services you created earlier.
Try adding some guestbook entries by typing in a message, and clicking Submit.
The message you typed appears in the frontend. This message indicates that
data is successfully added to Redis through the Services you created earlier.
-->
尝试通过输入消息并点击 Submit 来添加一些留言板条目。
你所输入的消息会在前端显示。这一消息表明数据被通过你
之前所创建的 Service 添加到 Redis 存储中。
你所输入的消息会在前端显示。这一消息表明数据被通过你之前所创建的
Service 添加到 Redis 存储中。
{{< /note >}}

<!--
## Scale the Web Frontend
-->
## 扩展 Web 前端
## 扩展 Web 前端 {#scale-the-web-frontend}

<!--
You can scale up or down as needed because your servers are defined as a Service that uses a Deployment controller.
You can scale up or down as needed because your servers are defined as a
Service that uses a Deployment controller.
-->
你可以根据需要执行伸缩操作，这是因为服务器本身被定义为使用一个
Deployment 控制器的 Service。
Expand Down Expand Up @@ -574,15 +601,16 @@ Deployment 控制器的 Service。
## {{% heading "cleanup" %}}

<!--
Deleting the Deployments and Services also deletes any running Pods. Use labels to delete multiple resources with one command.
Deleting the Deployments and Services also deletes any running Pods. Use
labels to delete multiple resources with one command.
-->
删除 Deployments 和服务还会删除正在运行的 Pod。
使用标签用一个命令删除多个资源。

<!--
1. Run the following commands to delete all Pods, Deployments, and Services.
-->
1. 运行以下命令以删除所有 Pod，Deployments 和 Services。
1. 运行以下命令以删除所有 Pod、Deployment 和 Service。

```shell
kubectl delete deployment -l app=redis
Expand All @@ -602,6 +630,7 @@ Deleting the Deployments and Services also deletes any running Pods. Use labels
deployment.apps "frontend" deleted
service "frontend" deleted
```

<!--
1. Query the list of Pods to verify that no Pods are running:
-->
Expand All @@ -617,7 +646,6 @@ Deleting the Deployments and Services also deletes any running Pods. Use labels
响应应该是：

```
No resources found in default namespace.
```

Expand All @@ -626,11 +654,11 @@ Deleting the Deployments and Services also deletes any running Pods. Use labels
<!--
* Complete the [Kubernetes Basics](/docs/tutorials/kubernetes-basics/) Interactive Tutorials
* Use Kubernetes to create a blog using [Persistent Volumes for MySQL and Wordpress](/docs/tutorials/stateful-application/mysql-wordpress-persistent-volume/#visit-your-new-wordpress-blog)
* Read more about [connecting applications](/docs/concepts/services-networking/connect-applications-service/)
* Read more about [connecting applications with services](/docs/tutorials/services/connect-applications-service/)
* Read more about [Managing Resources](/docs/concepts/cluster-administration/manage-deployment/#using-labels-effectively)
-->
* 完成 [Kubernetes 基础](/zh-cn/docs/tutorials/kubernetes-basics/) 交互式教程
* 使用 Kubernetes 创建一个博客，使用
[MySQL 和 Wordpress 的持久卷](/zh-cn/docs/tutorials/stateful-application/mysql-wordpress-persistent-volume/#visit-your-new-wordpress-blog)
* 进一步阅读[连接应用程序](/zh-cn/docs/concepts/services-networking/connect-applications-service/)
* 进一步阅读[使用 Service 连接到应用](/zh-cn/docs/tutorials/services/connect-applications-service/)
* 进一步阅读[管理资源](/zh-cn/docs/concepts/cluster-administration/manage-deployment/#using-labels-effectively)

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