Unable to start Appian 18.2 Docker configuration

Question

Trying to install and run Appian using Docker on Ubuntu environment. 
 Have done everything as described here: https://docs.appian.com/suite/help/18.2/Installing_Appian_in_Docker_Containers.html 
 But unable to start Appian. The server.log attached. 
 2313.server.log

Mathieu Drouin · Accepted Answer

Problem is that it can't find the appian-topology.xml file 
 
10:32:09,208 INFO [stdout] (ServerService Thread Pool -- 64) com.appiancorp.suiteapi.common.exceptions.AppianException: The search server cannot be reached. Failed to connect to server at [localhost:9300]. Check that the search server is started. If running multiple application servers, check that appian-topology.xml is properly configured with the search cluster details. The appian-topology.xml file must be distributed to each /ear/suite.ear/conf/ and /search-server/conf/ directory. See documentation for details. (APNX-1-4274-001) 
 
I got it working on my Mac by replacing all the instances of ${APPIAN_HOME}/ear/suite.ear/conf/ with ${APPIAN_HOME}/conf/ in docker-compose.yml. 
 
i.e.- ./conf/appian-topology.xml:${APPIAN_HOME}/ear/suite.ear/conf/appian-topology.xml ===>> - ./conf/appian-topology.xml:${APPIAN_HOME}/conf/appian-topology.xml

Philip Snyman · Answer

I resolved this issue by adding a .env file in the same directory as the docker-compose.yml file. The contents of the .env file is as follows: 
 APPIAN_HOME=/usr/local/appian/ae
JBOSS_HOME=/usr/local/jboss 
 It is a less invasive way of setting the environment variables.