Christian Köcke created KAFKA-12653: ---------------------------------------
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 -- This message was sent by Atlassian Jira (v8.3.4#803005)