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DRAFT KB-XXXX Engine start up fails on RHEL 7.5 and RHEL 7.4 with "Address already in use" error

Symptoms

Engine start-up fails while running Appian on RHEL 7.4 and 7.5. Although port 2181 is free, the following error is found in zookeeper.log located in <APPIAN_HOME>/logs/service-manager/zookeeper/:

2018-08-20 04:46:51,819 [myid:] - ERROR [main:ZooKeeperServerMain@66] - Unexpected exception, exiting abnormally
java.net.BindException: Address already in use

After running the start command, engine start-up has the following error on command line prompt:

waiting for process QuorumPeerMain
waiting for process QuorumPeerMain
process QuorumPeerMain not running after 10000 seconds
Unable to start service QuorumPeerMain
java.util.concurrent.TimeoutException: Process QuorumPeerMain did not launch within 10000 ms

Cause

This error is caused on RHEL 7.4 and RHEL 7.5 version. 

Action

Check the server version and switch to RHEL 6.X or lower. 

Affected Versions

This article applies to Appian 17.3 and later.

Last Reviewed: August 2018