Praveen In order to use Netty it is better for you to use 3.5.6 that contains Netty 4, ZooKeeper 3.4.x uses the deprecated Netty 3. For TSL, and it is known to have security flaws and it is no more maintained
Btw your problem looks like there is a missing class and it is weird Enrico Il giorno 16/01/20, 10:25 "Praveen Kumar K S" <prav...@securelyshare.com> ha scritto: Hello, I'm looking for help on enabling authentication in zookeeper. Please note below approach I have tried. 1. I followed https://cwiki.apache.org/confluence/display/ZOOKEEPER/ZooKeeper+SSL+User+Guide 2. I'm deploying zookeeper as single node using docker 3. Zookeeper version is 3.4.13 4. Below are some important environmental variables in zookeeper container CLIENT_JVMFLAGS=-Dzookeeper.clientCnxnSocket=org.apache.zookeeper.ClientCnxnSocketNetty -Dzookeeper.client.secure=true -Dzookeeper.ssl.keyStore.location=/opt/vault/zookeeper/ssl/KeyStore.jks -Dzookeeper.ssl.keyStore.password=XX@123 -Dzookeeper.ssl.trustStore.location=/opt/vault/zookeeper/ssl/truststore.jks -Dzookeeper.ssl.trustStore.password=XX@123 SERVER_JVMFLAGS=-Dzookeeper.serverCnxnFactory=org.apache.zookeeper.server.NettyServerCnxnFactory -Dzookeeper.ssl.keyStore.location=/opt/vault/zookeeper/ssl/KeyStore.jks -Dzookeeper.ssl.keyStore.password=XX@123 -Dzookeeper.ssl.trustStore.location=/opt/vault/zookeeper/ssl/truststore.jks -Dzookeeper.ssl.trustStore.password=XX@123 zookeeper.serverCnxnFactory="org.apache.zookeeper.server.NettyServerCnxnFactory" 5. Below is conf file server.1=0.0.0.0:2888:3888 secureClientPort=2281 initLimit=5 syncLimit=2 tickTime=2000 clientPort=2181 clientPortAddress=zookeeper dataLogDir=/opt/vault/zookeeper/logs dataDir=/opt/vault/zookeeper/data 6. Zookeeper is healthy 7. I tried connecting to Zookeeper server from my machine using zkCli.sh. But getting below error 2020-01-16 14:21:27,798 [myid:] - INFO [main:ZooKeeper@442] - Initiating client connection, connectString=zookeeper:2281 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@531d72ca Exception in thread "main" java.io.IOException: Couldn't instantiate org.apache.zookeeper.ClientCnxnSocketNetty at org.apache.zookeeper.ZooKeeper.getClientCnxnSocket(ZooKeeper.java:1851) at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:453) at org.apache.zookeeper.ZooKeeperMain.connectToZK(ZooKeeperMain.java:283) at org.apache.zookeeper.ZooKeeperMain.<init>(ZooKeeperMain.java:297) at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:290) Caused by: java.lang.ClassNotFoundException: org.apache.zookeeper.ClientCnxnSocketNetty at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at org.apache.zookeeper.ZooKeeper.getClientCnxnSocket(ZooKeeper.java:1848) ... 4 more 8.Zookeeper is working fine on 2181 9.I tried to connect Kafka to Zookeeper on port 2281. Getting below error [2020-01-16 09:12:07,477] INFO Initiating client connection, connectString=zookeeper:2281 sessionTimeout=6000 watcher=kafka.zookeeper.ZooKeeperClient$ZooKeeperClientWatcher$@5c33f1a9 (org.apache.zookeeper.ZooKeeper) [2020-01-16 09:12:07,488] INFO [ZooKeeperClient] Waiting until connected. (kafka.zookeeper.ZooKeeperClient) [2020-01-16 09:12:07,489] INFO Opening socket connection to server zookeeper/172.16.13.2:2281. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn) [2020-01-16 09:12:07,493] INFO Socket error occurred: zookeeper/ 172.16.13.2:2281: Connection refused (org.apache.zookeeper.ClientCnxn) [2020-01-16 09:12:08,599] INFO Opening socket connection to server zookeeper/172.16.13.2:2281. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn) Please help and advice. Regards, Praveen Kumar K S +91-9986855625 ________________________________ CONFIDENTIALITY & PRIVACY NOTICE This e-mail (including any attachments) is strictly confidential and may also contain privileged information. If you are not the intended recipient you are not authorised to read, print, save, process or disclose this message. If you have received this message by mistake, please inform the sender immediately and destroy this e-mail, its attachments and any copies. Any use, distribution, reproduction or disclosure by any person other than the intended recipient is strictly prohibited and the person responsible may incur in penalties. The use of this e-mail is only for professional purposes; there is no guarantee that the correspondence towards this e-mail will be read only by the recipient, because, under certain circumstances, there may be a need to access this email by third subjects belonging to the Company.