问题描述
我有一个容器在Kubernetes集群内部(在POD内)与许多其他容器(在其自己的POD中)一起运行，并且我的容器是一个普通的容器.现在，我想将文件从其他容器中拉出(复制)到我的普通容器中.我研究了一些选项，发现可以使用kubectl副本.但是，为此，我需要在公共容器中包含kubectl命令行工具.我不确定这是否正确.因此，我想到了使用Java Kubernetes API进行相同的操作.Kubectl复制命令是否具有等效的Kubernetes REST API?我经历了kubernetes API，找不到任何这样的API ..
I have a container running inside Kubernetes cluster (within POD) along side many other containers (in their own PODs) and my container is a common container. Now, I want to pull (copy) the files from other containers to my common container. I investigated for some options and found that kubectl copy can be used. But, for that, I need to include kubectl command line tool inside my common container. I'm not sure if this is right approach. So, I thought of using Java Kubernetes APIs to do the same.Is there equivalent Kubernetes REST API for Kubectl copy command ? I gone through the kubernetes APIs and could not find any such API ..
谢谢
推荐答案
这是因为 kubectl cp是通过tar 实现的，因此实际上发生的是kubectl exec $pod -- tar -cf - /the/container/file | tar -xf -，这是我期望的Java API也需要这样做.
That's because kubectl cp is implemented via tar, so what is actually happening is kubectl exec $pod -- tar -cf - /the/container/file | tar -xf -, which is what I would expect your Java API would need to do, as well.
但是，您可能-根据您的需要-能够摆脱在kubectl cp到达之前我曾经做过的事情:kubectl exec $pod -- /bin/cat /the/container/file > local-file在您的情况下，这可能会容易得多，因为我希望API会将这些字节具体化为InputStream，从而使您无需再进行tar格式解析业务
However, you may -- depending on your needs -- be able to get away with how I used to do it before kubectl cp arrived: kubectl exec $pod -- /bin/cat /the/container/file > local-file which in your circumstance may be a ton easier since I would expect the API would materialize those bytes as an InputStream, saving you the need to get into the tar-format-parsing business
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