[jira] [Created] (KAFKA-8417) Remove redundant network definition --net=host when starting testing docker containers

["Konstantine Karantasis (JIRA)" <ji...@apache.org>]

Konstantine Karantasis created KAFKA-8417:
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             Summary: 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


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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