如何使用 fabric8 kubernetes java 客户端从部署的 pod 中读取文件？

Question

How can I read a file from a deployment's pods? More specifically, I want fabric8's kubernetes java client equivalent of the following command:

kubectl exec --stdin --tty deployment/otel-collector -n logcollection -- cat /otel-output/json-out.json

PS: you can ignore the --stdin and --tty flags.

Answer 1

It's fairly simple, to read file from a Pod you can use the following syntax (see also fabric8 documentation ):

try (InputStream is = client.pods().inNamespace(currentNamespace).withName(pod1.getMetadata().getName()).file("/msg").read())  {
  String result = new BufferedReader(new InputStreamReader(is)).lines().collect(Collectors.joining("\n"));
}