When running the Neo4j standalone community Docker, some logs are written to stdout and some to a file inside the container: debug.log.
I would like to be able to set log4j options, like log-level, appenders etc. The reasons are:
- I can't access the log files when running in e.g AWS ECS
- The debug logs are quite verbose
- log4j-properties are convenient to deploy and manage
So the question is, how can I set a custom log4j properties for a Neo4j server that's running inside a container?
It's not documented if it's even possible, but I have tried the usual things one starts to thing of. First adding a log4j.xml to the classpath but to no avail. Also I have tried setting dbms.jvm.additional to
-Dlog4j.configuration=<path_to_file>-Dlog4j.configurationFile=<path_to_file>-Dlog4j2.configurationFile==<path_to_file>
I've verified that the Neo4j process has the correct jvm-arguments:
/usr/local/openjdk-11/bin/java -cp /var/lib/neo4j/plugins:/var/lib/neo4j/conf:/var/lib/neo4j/lib/*:/var/lib/neo4j/plugins/*
-Xms2048m -Xmx2048m -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
-XX:+UnlockExperimentalVMOptions -XX:+TrustFinalNonStaticFields -XX:+DisableExplicitGC
-XX:MaxInlineLevel=15 -XX:-UseBiasedLocking -Djdk.nio.maxCachedBufferSize=262144
-Dio.netty.tryReflectionSetAccessible=true -Djdk.tls.ephemeralDHKeySize=2048
-Djdk.tls.rejectClientInitiatedRenegotiation=true -XX:FlightRecorderOptions=stackdepth=256
-XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints -Dlog4j2.disable.jmx=true
-Dlog4j.configuration=file:/var/lib/neo4j/conf/log4j.properties
-Dlog4j.configurationFile=file:/var/lib/neo4j/conf/log4j.xml
-Dlog4j2.configurationFile=file:/var/lib/neo4j/conf/log4j2.xml
-Dfile.encoding=UTF-8 org.neo4j.server.CommunityEntryPoint
--home-dir=/var/lib/neo4j --config-dir=/var/lib/neo4j/conf
I have verified that no lib-jars contains a log4j-properties that takes precedence.
And whatever I try, no changes are made to the way the server is logging. The same events are written to /logs/debug.log. No exceptions regarding bad log4j config or something like that.
I have created a small project for easier debugging.