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https://issues.apache.org/jira/browse/KAFKA-8417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantine Karantasis resolved KAFKA-8417.
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Resolution: Fixed
> Remove redundant network definition --net=host when starting testing docker
> containers
> --------------------------------------------------------------------------------------
>
> Key: KAFKA-8417
> URL: https://issues.apache.org/jira/browse/KAFKA-8417
> Project: Kafka
> Issue Type: Bug
> Components: system tests
> Reporter: Konstantine Karantasis
> Assignee: Konstantine Karantasis
> Priority: Major
>
> The switches {{--net}} and {{--network}} are equivalent in docker, with the
> latter being preferred.
> (see
> [https://github.com/docker/cli/blob/master/cli/command/container/opts.go]
> where currently there's the comment: _// We allow for both "--net" and
> "--network", although the latter is the recommended way._)
> However, in recent Docker versions, defining both as follows:
> {{--net=host --network ducknet}}
> fails with error:
> {{docker: conflicting options: cannot attach both user-defined and
> non-user-defined network-modes.}}
> Removing {{--net=host}} and keeping only the user-defined network should fix
> the issue.
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