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https://issues.apache.org/jira/browse/MESOS-4643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15237379#comment-15237379
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Jan Schlicht commented on MESOS-4643:
-------------------------------------
With the use of {{os::realpath}} since
{{eaecce08a7ce0d72537512cbfccb77e545bb10b8}} this will cause the tests to crash
if {{/var/run/netns}} does not exist.
> PortMappingIsolatorTest fail when no namespaces are set.
> --------------------------------------------------------
>
> Key: MESOS-4643
> URL: https://issues.apache.org/jira/browse/MESOS-4643
> Project: Mesos
> Issue Type: Bug
> Environment: Linux Kernel 3.19.0-49-generic,
> libnl-3.2.27
> Reporter: Till Toenshoff
> Priority: Minor
>
> Currently our network isolator tests fail with the following output on a
> Ubuntu 14.04 VM.
> {noformat}
> [02:10:15][Step 8/8] [ RUN ]
> PortMappingIsolatorTest.ROOT_NC_ContainerToContainerTCP
> [02:10:15][Step 8/8]
> ../../src/tests/containerizer/port_mapping_tests.cpp:164: Failure
> [02:10:15][Step 8/8] entries: Failed to opendir '/var/run/netns': No such
> file or directory
> [02:10:15][Step 8/8]
> ../../src/tests/containerizer/port_mapping_tests.cpp:164: Failure
> [02:10:15][Step 8/8] entries: Failed to opendir '/var/run/netns': No such
> file or directory
> [02:10:15][Step 8/8] [ FAILED ]
> PortMappingIsolatorTest.ROOT_NC_ContainerToContainerTCP (4 ms)
> {noformat}
> The machine has no network namespaces set, hence {{/var/run/netns}} does not
> exist.
> We should help users understanding this prerequisite or maybe even get these
> things in a fixture.
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