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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