Can't start Zookeeper on a EC2 instance in a public subnet

[Su She]

Hello Everyone,

I previously had my EC2 instances in a private subnet, but I spun up a new
cluster in a public subnet. However, it seems to have taken me a step back
as now I can't even start the zookeeper. I am getting this error:

ERROR Unexpected exception, exiting abnormally
(org.apache.zookeeper.server.ZooKeeperServerMain)
java.net.BindException: Address already in use
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:444)
        at sun.nio.ch.Net.bind(Net.java:436)
        at
sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
        at
org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:95)
        at
org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:111)
        at
org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:86)
        at
org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:52)
        at
org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:116)
        at
org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
I am confused as to how to move forward as the zookeeper.properties file
does not allow for many configurations. Thank you!