[jira] [Created] (KAFKA-12653) Reverse DNS Lookup on Zookeeper Connect String

["Christian Köcke (Jira)" <ji...@apache.org>]

Christian Köcke created KAFKA-12653:
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             Summary: Reverse DNS Lookup on Zookeeper Connect String
                 Key: KAFKA-12653
                 URL: https://issues.apache.org/jira/browse/KAFKA-12653
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 2.2.0
            Reporter: Christian Köcke


Hey, 

 

in my setup I try to set several zookeeper nodes within my kafka broker (docker container) as fix IPs.

The line within the s+erver.propertie+s file looks something like:

 
{code:java}
[...]
zookeeper.connect=10.0.0.10:2181,10.0.0.11:2181,10.0.0.12:2181
{code}
 

If I try to start the docker container, the following message appears:
{code:java}
[2021-04-11 19:30:55,673] INFO Initiating client connection, connectString=10.0.0.10:2181,10.0.0.11:2181,10.0.0.12:2181 sessionTimeout=6000 watcher=kafka.zookeeper.ZooKeeperClient$ZooKeeperClientWatcher$@5b8dfcc1 (org.apache.zookeeper.ZooKeeper)
[2021-04-11 19:30:55,683] INFO [ZooKeeperClient] Waiting until connected. (kafka.zookeeper.ZooKeeperClient) 
[2021-04-11 19:31:01,685] INFO [ZooKeeperClient] Closing. (kafka.zookeeper.ZooKeeperClient)
{code}
My network config (netplan) looks like this:

 

 
{code:java}
network:
  version: 2
  renderer: networkd
  ethernets:
    ens160:
      dhcp4: no
      dhcp6: no
      addresses:
        - 10.0.0.100/8
      gateway4: 10.0.0.1
      {code}
 

 

As soon as I adjust my netplan config like the following:

 
{code:java}
network:
  version: 2
  renderer: networkd
  ethernets:
    ens160:
      dhcp4: no
      dhcp6: no
      addresses:
        - 10.0.0.100/8
      gateway4: 10.0.0.1 
      nameservers:
                    addresses: [10.0.0.150] #Bind9 DNS{code}
 

Everything works. 

*Please note,* that the above mentioned DNS Server cannot provide a resolvable name for each IP, because there is *no DNS record available* at all.

 

For me it looks like that kafka requires any kind of DNS acknowledgment to work properly.

 

Please let me know if there is any kind of parameter / configuration setting to disable the reverse lookup check for the "zookeeper.connect" setting.

 

Unfortunately Im not able to provide any kind of DNS server within the productive setup, all services are controlled by their IP.

 

Used Kafka version is *2.2.0*

Thanks for your help.

 

Kind regards,

Christian 



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