问题描述
我现在正在尝试在Kubernetes集群上运行一个带有shell(/bin/bash)的简单容器.
I'm now trying to run a simple container with shell (/bin/bash) on a Kubernetes cluster.
我认为可以使用pseudo-tty和detach选项(docker run命令的-td选项)来保持容器在Docker容器上运行.
I thought that there was a way to keep a container running on a Docker container by using pseudo-tty and detach option (-td option on docker run command).
例如，
$ sudo docker run -td ubuntu:latest
Kubernetes中有这样的选择吗?
Is there an option like this in Kubernetes?
我尝试使用kubectl run-container命令运行容器，例如:
I've tried running a container by using a kubectl run-container command like:
kubectl run-container test_container ubuntu:latest --replicas=1
但是容器会退出几秒钟(就像使用docker run命令启动时没有上面我提到的选项一样).然后ReplicationController反复再次启动它.
But the container exits for a few seconds (just like launching with the docker run command without options I mentioned above). And ReplicationController launches it again repeatedly.
是否可以像docker run命令中的-td选项那样保持容器在Kubernetes上运行?
Is there a way to keep a container running on Kubernetes like the -td options in the docker run command?
推荐答案
容器在其主进程退出时退出.做类似的事情:
A container exits when its main process exits. Doing something like:
docker run -itd debian
坦率地说，将容器保持打开状态是一种hack，仅应用于快速测试和示例.如果您只想要一个容器进行几分钟的测试，我会这样做:
to hold the container open is frankly a hack that should only be used for quick tests and examples. If you just want a container for testing for a few minutes, I would do:
docker run -d debian sleep 300
其优点是，如果您忘记了该容器，它将自动退出.另外，您可以在while循环中放置类似的内容以使其永久运行，或者仅运行诸如top之类的应用程序.所有这些都应该在Kubernetes中很容易做到.
Which has the advantage that the container will automatically exit if you forget about it. Alternatively, you could put something like this in a while loop to keep it running forever, or just run an application such as top. All of these should be easy to do in Kubernetes.
真正的问题是，为什么要这样做?您的容器应提供服务，其过程将使容器在后台运行.
The real question is why would you want to do this? Your container should be providing a service, whose process will keep the container running in the background.
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