Zookeeper unable to listen on port 3888

Question

I've got 3 servers on aws. each with open jdk 7 and zookeeper 3.4.6 all have unique elastic ip's. each conf/zoo.cfg has

clientPort=2181
server.1=server1:2888:3888
server.2=server2:2888:3888
server.3=server3:2888:3888

then i start it with ./zkServer.sh start (says STARTED) and the zookeeper.out says

2015-01-14 09:27:55,919 [myid:1] - INFO  [Thread-1:QuorumCnxManager$Listener@504] - My election bind port: /server1ipaddress:3888
2015-01-14 09:27:55,920 [myid:1] - ERROR [/server1ipaddress:3888:QuorumCnxManager$Listener@517] - Exception while listening
    java.net.BindException: Cannot assign requested address
            at java.net.PlainSocketImpl.socketBind(Native Method)
            at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:376)
            at java.net.ServerSocket.bind(ServerSocket.java:376)
            at java.net.ServerSocket.bind(ServerSocket.java:330)
            at org.apache.zookeeper.server.quorum.QuorumCnxManager$Listener.run(QuorumCnxManager.java:507)

So it cant open the port. i've eventually opened all ports on aws security to rule that out.

telnet into 2181 with ruok gets imok.
telnet into 2888 cannot connect. connection refused.
telnet into 3888 cannot connect. connection refused.

netstat shows that nothing is blocking 2888 and 3888

i've even tried this with all 3 servers having zookeeper started. whats going on? how do i get those ports open for use.

i think i solved it. i used the internal AWS IP's for the server list in zoo.cfg now on ./zkServer.sh status i get leader & follower on the other 2 — Mithun Kalan

Irek Nazmiev Irek Nazmiev · Accepted Answer · 2020-10-12T21:30:27

Your problem is answered here.

In a few words: on each ZooKeeper machine, at your conf/zoo.cfg, you have to set the current server's IP to 0.0.0.0. For example: if you are currently on server1, the config should contain the following lines:

server.1=0.0.0.0:2888:3888
server.2=server2:2888:3888
server.3=server3:2888:3888

This step solved the problem in my case.

Zookeeper unable to listen on port 3888

2 Answers