How to get a heapdump from a Docker container

When running a Java application with Docker, a memory leak may occur and the application may crash. Dump the heap used by java at that time so that it can be parsed.

Set the heap dump option in JAVA_OPTS in Dockerfile

ENV JAVA_OPTS="-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/dump.hprof"

Get a heap dump with Docker cp

docker ps -aq | xargs -I{} docker cp {}:/tmp/dump.hprof /tmp/{}_dump.hprof

Parse heap dump

Use MAT or jhat for analysis

memory analyzer (MAT)

jhat

Reference URL

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