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content/zh/docs/tasks/access-application-cluster/port-forward-access-application-cluster.md
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@@ -12,35 +12,35 @@ weight: 40
<!-- overview -->
<!--
This page shows how to use `kubectl port-forward` to connect to a Redis
This page shows how to use `kubectl port-forward` to connect to a MongoDB
server running in a Kubernetes cluster. This type of connection can be useful
for database debugging.
-->
本文展示如何使用 `kubectl port-forward` 连接到在 Kubernetes 集群中
运行的 Redis 服务。这种类型的连接对数据库调试很有用。
运行的 MongoDB 服务。这种类型的连接对数据库调试很有用。
## {{% heading "prerequisites" %}}
* {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
<!--
* Install [redis-cli](http://redis.io/topics/rediscli).
* Install [MongoDB Shell](https://www.mongodb.com/try/download/shell).
-->
* 安装 [redis-cli](http://redis.io/topics/rediscli)。
* 安装 [MongoDB Shell](https://www.mongodb.com/try/download/shell)。
<!-- steps -->
<!--
## Creating Redis deployment and service
## Creating MongoDB deployment and service
1. Create a Redis deployment:
1. Create a Deployment that runs MongoDB:
-->
## 创建 Redis deployment 和服务
## 创建 MongoDB deployment 和服务
1. 创建一个 Redis deployment：
1. 创建一个运行 MongoDB 的 deployment：
```shell
kubectl apply -f https://k8s.io/examples/application/guestbook/redis-master-deployment.yaml
kubectl apply -f https://k8s.io/examples/application/guestbook/mongo-deployment.yaml
```
<!--
@@ -49,7 +49,7 @@ for database debugging.
查看输出是否成功，以验证是否成功创建 deployment：
```
deployment.apps/redis-master created
deployment.apps/mongo created
```
<!--
@@ -67,144 +67,154 @@ for database debugging.
输出显示创建的 pod：
```
NAME READY STATUS RESTARTS AGE
redis-master-765d459796-258hz 1/1 Running 0 50s
NAME READY STATUS RESTARTS AGE
mongo-75f59d57f4-4nd6q 1/1 Running 0 2m4s
```
<!--
View the deployment status:
View the Deployment's status:
-->
查看 deployment 状态：
查看 Deployment 状态：
```shell
kubectl get deployment
```
<!--
The output displays that the deployment was created:
The output displays that the Deployment was created:
-->
输出显示创建的 deployment：
输出显示创建的 Deployment：
```
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
redis-master 1 1 1 1 55s
NAME READY UP-TO-DATE AVAILABLE AGE
mongo 1/1 1 1 2m21s
```
<!--
View the replicaset status using:
The Deployment automatically manages a ReplicaSet.
View the ReplicaSet status using:
-->
查看 replicaset 状态：
Deployment 自动管理 ReplicaSet。
查看 ReplicaSet 状态：
```shell
kubectl get rs
kubectl get replicaset
```
<!--
The output displays that the replicaset was created:
The output displays that the ReplicaSet was created:
-->
输出显示创建的 replicaset：
输出显示创建的 ReplicaSet：
```
NAME DESIRED CURRENT READY AGE
redis-master-765d459796 1 1 1 1m
NAME DESIRED CURRENT READY AGE
mongo-75f59d57f4 1 1 1 3m12s
```
<!--
2. Create a Redis service:
2. Create a Service to expose MongoDB on the network:
-->
2. 创建一个 Redis 服务：
2. 创建一个在网络上公开的 MongoDB 服务：
```shell
kubectl apply -f https://k8s.io/examples/application/guestbook/redis-master-service.yaml
kubectl apply -f https://k8s.io/examples/application/guestbook/mongo-service.yaml
```
<!--
The output of a successful command verifies that the service was created:
The output of a successful command verifies that the Service was created:
-->
查看输出是否成功，以验证是否成功创建 service：
查看输出是否成功，以验证是否成功创建 Service：
```
service/redis-master created
service/mongo created
```
<!--
Check the service created:
Check the Service created:
-->
检查 service 是否创建：
检查 Service 是否创建：
```shell
kubectl get svc | grep redis
kubectl get service mongo
```
<!--
The output displays the service created:
-->
输出显示创建的 service：
输出显示创建的 Service：
```
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
redis-master ClusterIP 10.0.0.213 <none> 6379/TCP 27s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
mongo ClusterIP 10.96.41.183 <none> 27017/TCP 11s
```
<!--
3. Verify that the Redis server is running in the pod and listening on port 6379:
3. Verify that the MongoDB server is running in the Pod, and listening on port 27017:
-->
3. 验证 Redis 服务是否运行在 pod 中并且监听 6379 端口：
3. 验证 MongoDB 服务是否运行在 Pod 中并且监听 27017 端口：
```shell
kubectl get pods redis-master-765d459796-258hz \
--template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
# Change mongo-75f59d57f4-4nd6q to the name of the Pod
kubectl get pod mongo-75f59d57f4-4nd6q --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
```
<!--
The output displays the port:
The output displays the port for MongoDB in that Pod:
-->
输出应该显示端口：
输出应该显示 Pod 中 MongoDB 的端口：
```
6379
27017
```
<!--
(this is the TCP port allocated to MongoDB on the internet).
-->
（这是 Internet 分配给 MongoDB 的 TCP 端口）。
<!--
## Forward a local port to a port on the pod
## Forward a local port to a port on the Pod
1. `kubectl port-forward` allows using resource name, such as a pod name, to select a matching pod to port forward to since Kubernetes v1.10.
1. `kubectl port-forward` allows using resource name, such as a pod name, to select a matching pod to port forward to.
-->
## 转发一个本地端口到 pod 端口
## 转发一个本地端口到 Pod 端口
1. 从 Kubernetes v1.10 开始，`kubectl port-forward` 允许使用资源名称
1. `kubectl port-forward` 允许使用资源名称
（例如 pod 名称）来选择匹配的 pod 来进行端口转发。
```shell
kubectl port-forward redis-master-765d459796-258hz 7000:6379
# Change mongo-75f59d57f4-4nd6q to the name of the Pod
kubectl port-forward mongo-75f59d57f4-4nd6q 28015:27017
```
<!--
which is the same as
-->
这相当于
```shell
kubectl port-forward pods/redis-master-765d459796-258hz 7000:6379
kubectl port-forward pods/mongo-75f59d57f4-4nd6q 28015:27017
```
<!-- or -->
或者
```shell
kubectl port-forward deployment/redis-master 7000:6379
kubectl port-forward deployment/mongo 28015:27017
```
<!-- or -->
或者
```shell
kubectl port-forward rs/redis-master 7000:6379
kubectl port-forward replicaset/mongo-75f59d57f4 28015:27017
```
<!-- or -->
或者
```
kubectl port-forward svc/redis-master 7000:redis
```shell
kubectl port-forward service/mongo 28015:27017
```
<!--
@@ -213,9 +223,9 @@ for database debugging.
以上所有命令都应该有效。输出应该类似于：
```
Forwarding from 127.0.0.1:7000 -> 6379
Forwarding from [::1]:7000 -> 6379
```
Forwarding from 127.0.0.1:28015 -> 27017
Forwarding from [::1]:28015 -> 27017
```
<!--
{{< note >}}
@@ -231,21 +241,21 @@ for database debugging.
<!--
2. Start the Redis command line interface:
2. Start the MongoDB command line interface:
-->
2. 启动 Redis 命令行接口：
2. 启动 MongoDB 命令行接口：
```shell
redis-cli -p 7000
mongosh --port 28015
```
<!--
3. At the Redis command line prompt, enter the `ping` command:
3. At the MongoDB command line prompt, enter the `ping` command:
-->
3. 在 Redis 命令行提示符下，输入 `ping` 命令：
3. 在 MongoDB 命令行提示符下，输入 `ping` 命令：
```
ping
db.runCommand( { ping: 1 } )
```
<!--
@@ -254,8 +264,9 @@ for database debugging.
成功的 ping 请求应该返回：
```
PONG
{ ok: 1 }
```
<!--
### Optionally let _kubectl_ choose the local port {#let-kubectl-choose-local-port}
-->
@@ -270,43 +281,54 @@ the slightly simpler syntax:
以便你不需要管理本地端口冲突。该命令使用稍微不同的语法：
```shell
kubectl port-forward deployment/redis-master :6379
kubectl port-forward deployment/mongo :27017
```
<!--
The output is similar to this:
-->
输出应该类似于：
```
Forwarding from 127.0.0.1:63753 -> 27017
Forwarding from [::1]:63753 -> 27017
```
<!--
The `kubectl` tool finds a local port number that is not in use (avoiding low ports numbers,
because these might be used by other applications). The output is similar to:
-->
`kubectl` 工具会找到一个未被使用的本地端口号（避免使用低段位的端口号，因为他们可能会被其他应用程序使用）。输出应该类似于：
`kubectl` 工具会找到一个未被使用的本地端口号（避免使用低段位的端口号，因为他们可能会被其他应用程序使用）。
输出应该类似于：
```
Forwarding from 127.0.0.1:62162 -> 6379
Forwarding from [::1]:62162 -> 6379
Forwarding from 127.0.0.1:63753 -> 27017
Forwarding from [::1]:63753 -> 27017
```
<!-- discussion -->
<!--
## Discussion
Connections made to local port 7000 are forwarded to port 6379 of the pod that
is running the Redis server. With this connection in place you can use your
local workstation to debug the database that is running in the pod.
Connections made to local port 28015 are forwarded to port 27017 of the Pod that
is running the MongoDB server. With this connection in place, you can use your
local workstation to debug the database that is running in the Pod.
-->
## 讨论 {#discussion}
与本地 7000 端口建立的连接将转发到运行 Redis 服务器的 pod 的 6379 端口。
通过此连接，您可以使用本地工作站来调试在 pod 中运行的数据库。
与本地 28015 端口建立的连接将转发到运行 MongoDB 服务器的 Pod 的 27017 端口。
通过此连接，您可以使用本地工作站来调试在 Pod 中运行的数据库。
<!--
Due to known limitations, port forward today only works for TCP protocol.
The support to UDP protocol is being tracked in
`kubectl port-forward` is implemented for TCP ports only.
The support for UDP protocol is tracked in
[issue 47862](https://github.com/kubernetes/kubernetes/issues/47862).
-->
{{< warning >}}
由于已知的限制，目前的端口转发仅适用于 TCP 协议。
`kubectl port-forward` 仅适用于 TCP 端口。
在 [issue 47862](https://github.com/kubernetes/kubernetes/issues/47862)
中正在跟踪对 UDP 协议的支持。
中跟踪了对 UDP 协议的支持。
{{< /warning >}}
## {{% heading "whatsnext" %}}