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https://issues.apache.org/jira/browse/KUDU-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758883#comment-16758883
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Alexey Serbin commented on KUDU-1900:
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[~grishick], I think the piece of code you are interested in is
https://github.com/apache/kudu/blob/990bb4d134c8fd9bd4621cd2fb9827d47f623db7/src/kudu/rpc/server_negotiation.cc#L512
> Localhost connections to single-host clusters on Ubuntu don't skip TLS
> ----------------------------------------------------------------------
>
> Key: KUDU-1900
> URL: https://issues.apache.org/jira/browse/KUDU-1900
> Project: Kudu
> Issue Type: Bug
> Components: perf, security
> Reporter: Todd Lipcon
> Priority: Major
> Labels: newbie
>
> On Ubuntu, it seems like we sometimes end up with connections from 127.0.1.1
> to 127.0.0.1 when running a local cluster and connecting to to it from the
> same machine. This is because Ubuntu puts an entry with the host's external
> hostname in /etc/hosts as 127.0.1.1, and the tablet server ends up
> registering with that name. The code that detects loopback connections sees
> the "127.0.0.1 -> 127.0.1.1" and decides it's not loopback.
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