如何在容器内运行 kubectl 命令? [英] How to run kubectl commands inside a container?

问题描述

在 pod 内的容器中，如何使用 kubectl 运行命令?例如，如果我需要在容器内做这样的事情:

<块引用>

kubectl 获取 pods

我已经尝试过:在我的 dockerfile 中，我有以下命令:

RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl运行 chmod +x ./kubectl运行 sudo mv ./kubectl/usr/local/bin/kubectl

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我正在尝试 OSX 文件，我已将其更正为 linux 二进制文件.(由@svenwltr 更正

在创建 docker 文件时，这是成功的，但是当我在容器内运行 kubectl get pods 时，

kubectl 获取 pods

我收到此错误:

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与服务器的连接:被拒绝 - 您是否指定了正确的主机或端口?

当我在本地部署时，如果我的 docker-machine 没有运行，我会遇到这个错误，但是在一个容器中，一个 docker-machine 如何运行?

在本地，我通过运行以下命令来解决此错误:(dev 是 docker-machine 的名字)

docker-machine env deveval $(docker-machine env dev)

有人可以告诉我我需要做什么吗?

解决方案

我会用kubernetes api，你只需要安装curl，而不是kubectl，剩下的就是restful.

curl http://localhost:8080/api/v1/namespaces/default/pods

我在我的一个 apiserver 上运行上面的命令.将 localhost 更改为 apiserver ip 地址/dns 名称.

根据您的配置，您可能需要使用 ssl 或提供客户端证书.

为了找到 api 端点，您可以使用 --v=8 和 kubectl.

示例:

kubectl 获取 pods --v=8

资源:

Kubernetes API 文档

RBAC 更新:

我假设您已经配置了 rbac，为您的 pod 创建了一个服务帐户并使用它运行.此服务帐户应该对所需命名空间中的 pod 具有列表权限.为此，您需要为该服务帐号创建角色和角色绑定.

集群中的每个容器都填充有可用于对 API 服务器进行身份验证的令牌.为了验证，在容器内运行:

cat/var/run/secrets/kubernetes.io/serviceaccount/token

要向 apiserver 发出请求，在容器内运行:

curl -ik -H "授权:不记名 $(cat/var/run/secrets/kubernetes.io/serviceaccount/token)" https://kubernetes.default.svc.cluster.local/api/v1/namespaces/default/pods

In a container inside a pod, how can I run a command using kubectl? For example, if i need to do something like this inside a container:

kubectl get pods

I have tried this : In my dockerfile, I have these commands :

RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
RUN chmod +x ./kubectl
RUN sudo mv ./kubectl /usr/local/bin/kubectl

EDIT : I was trying the OSX file, I have corrected it to the linux binary file. (corrected by @svenwltr

While creating the docker file, this is successful, but when I run the kubectl get pods inside a container,

kubectl get pods

I get this error :

The connection to the server : was refused - did you specify the right host or port?

When I was deploying locally, I was encountering this error if my docker-machine was not running, but inside a container how can a docker-machine be running?

Locally, I get around this error by running the following commands: (dev is the name of the docker-machine)

docker-machine env dev
eval $(docker-machine env dev)

Can someone please tell me what is it that I need to do?

解决方案

I would use kubernetes api, you just need to install curl, instead of kubectl and the rest is restful.

curl http://localhost:8080/api/v1/namespaces/default/pods

Im running above command on one of my apiservers. Change the localhost to apiserver ip address/dns name.

Depending on your configuration you may need to use ssl or provide client certificate.

In order to find api endpoints, you can use --v=8 with kubectl.

example:

kubectl get pods --v=8

Resources:

Kubernetes API documentation

Update for RBAC:

I assume you already configured rbac, created a service account for your pod and run using it. This service account should have list permissions on pods in required namespace. In order to do that, you need to create a role and role binding for that service account.

Every container in a cluster is populated with a token that can be used for authenticating to the API server. To verify, Inside the container run:

cat /var/run/secrets/kubernetes.io/serviceaccount/token

To make request to apiserver, inside the container run:

curl -ik 
     -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" 
     https://kubernetes.default.svc.cluster.local/api/v1/namespaces/default/pods

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