The kubelet test here is using a one minute timeout, instead of the
normal framework.PodStartTimeout.
The DNS results validation functions pull several images including
the jessie-dnsutils which is a bit bigger than usual.
The test "should write entries to /etc/hosts" should have the [LinuxOnly] tag as
it cannot pass on Windows; individual files cannot be mounted in Windows Containers.
This test was missed in the original PR (https://github.com/kubernetes/kubernetes/pull/73204)
Some of the tests cannot pass using Windows nodes due to various reasons:
- seLinuxOptions are not supported on Windows.
- Running as an UID / GID is not supported on Windows.
- file permissions work differently on Windows, and they cannot be set in
the same manner as on Linux.
- individual files cannot be mounted in Windows Containers.
- Cannot create container using Linux image (e.g.: alpine) on Windows.
Because of this, it has been decided to use the "[LinuxOnly]" tag for the
tests which cannot run on Windows because of the mentioned reasons. This way,
when running tests using Windows nodes, those tests can simply be skipped by
adding the "[LinuxOnly]" tag to the ginkgo.skip argument.
