ZooKeeper start successfully but doesn't work

Question

I am trying to deploy a zookeeper ensemble in fully distributed mode using three nodes. After starting the server no entry comes under jps. On giving "zkServer.sh status" the output is:

    JMX enabled by default
    Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
    Error contacting service. It is probably not running

On giving the command "zkCli.sh -server zks1:2181" is:

Connecting to zks1:2181
2015-05-24 23:02:24,602 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2015-05-24 23:02:24,605 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=mtech2-OptiPlex-7010
2015-05-24 23:02:24,606 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0_79
2015-05-24 23:02:24,607 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2015-05-24 23:02:24,607 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-7-openjdk-amd64/jre
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/usr/local/zookeeper/bin/../build/classes:/usr/local/zookeeper/bin/../build/lib/*.jar:/usr/local/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/usr/local/zookeeper/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/bin/../zookeeper-3.4.6.jar:/usr/local/zookeeper/bin/../src/java/lib/*.jar:/usr/local/zookeeper/bin/../conf:
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.75
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=hduser
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/hduser
2015-05-24 23:02:24,608 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/usr/local/zookeeper
2015-05-24 23:02:24,609 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=zks1:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@634fd55e
Welcome to ZooKeeper!
2015-05-24 23:02:24,741 [myid:] - INFO  [main-SendThread(zks1:2181):ClientCnxn$SendThread@975] - Opening socket connection to server zks1/192.168.4.60:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2015-05-24 23:02:24,755 [myid:] - WARN  [main-SendThread(zks1:2181):ClientCnxn$SendThread@1102] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
    at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
[zk: zks1:2181(CONNECTING) 0]

The /etc/hosts file is as follows for all the nodes:

    192.168.4.60    zks1
    192.168.4.61    zks2
    192.168.4.66    zks3

The zoo.cfg file is as follows:

    dataDir=/var/zookeeper/                                                                    
    clientPort=2181
    initLimit=5
    syncLimit=2
    server.server1=zks1:2888:3888                                
    server.server2=zks2:2888:3888
    server.server3=zks3:2888:3888

I had created the directory /var/zookeeper on all the nodes and changed the ownership to hduser:hadoop.

The exported environment variables are:

    export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
    export ZK_HOME=/usr/local/zookeeper
    export PATH=$PATH:$ZK_HOME/bin

The myid's in data directory(/var/zookeeper/) are server1, server2 and server3 respectively.

Please point out the problem.

Answer 1

Replacing server.server1 by server.1 and accordingly modifying myid file for each node did the trick.