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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/:
<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 script located in <APPIAN_HOME>/services/bin directory, following error is observed in the command line prompt::
<APPIAN_HOME>/services/bin
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
This error occurs when any of the zookeeper ports (2181, 2888 and 3888) are either blocked or occupied by an orphan process.
Check the port availability with admin privileges.
This article applies to Appian 17.3 and later.
Last Reviewed: August 2018