how do you get default Kafka configs global and per topic from command line?

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Since Kafka 2.5.0 (see https://issues.apache.org/jira/browse/KAFKA-9040), you can now use the --all option to see all (default and overridden) topic configuration:

% kafka-configs --bootstrap-server <KAFKA_SERVERS> --entity-type topics --entity-name <TOPIC_NAME> --describe --all
All configs for topic <TOPIC_NAME> are:
  compression.type=producer sensitive=false synonyms={}
  message.format.version=1.0-IV0 sensitive=false synonyms={}
  file.delete.delay.ms=60000 sensitive=false synonyms={}
  leader.replication.throttled.replicas= sensitive=false synonyms={}
  max.message.bytes=1000012 sensitive=false synonyms={}
  min.compaction.lag.ms=0 sensitive=false synonyms={}
  message.timestamp.type=CreateTime sensitive=false synonyms={}
  min.insync.replicas=1 sensitive=false synonyms={}
  segment.jitter.ms=0 sensitive=false synonyms={}
  preallocate=false sensitive=false synonyms={}
  index.interval.bytes=4096 sensitive=false synonyms={}
  min.cleanable.dirty.ratio=0.5 sensitive=false synonyms={}
  unclean.leader.election.enable=false sensitive=false synonyms={}
  retention.bytes=-1 sensitive=false synonyms={}
  delete.retention.ms=86400000 sensitive=false synonyms={}
  cleanup.policy=delete sensitive=false synonyms={}
  flush.ms=1000 sensitive=false synonyms={}
  follower.replication.throttled.replicas= sensitive=false synonyms={}
  segment.bytes=1073741824 sensitive=false synonyms={}
  retention.ms=172800000 sensitive=false synonyms={}
  segment.ms=604800000 sensitive=false synonyms={}
  message.timestamp.difference.max.ms=9223372036854775807 sensitive=false synonyms={}
  flush.messages=10000 sensitive=false synonyms={}
  segment.index.bytes=10485760 sensitive=false synonyms={}

As you can see in the PR, you can use this option for (at least) broker config too.

Also note that this option does not currently exist in kafka-topics CLI.

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