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Dockerfile for Fn Project java runtime
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FROM arm32v7/openjdk:9-slim | |
COPY target/runtime-*.jar target/dependency/*.jar /function/runtime/ | |
# UseCGroupMemoryLimitForHeap looks up /sys/fs/cgroup/memory/memory.limit_in_bytes inside the container to determine | |
# what the heap should be set to. This is an experimental feature at the moment, thus we need to unlock to use it. | |
# | |
# MaxRAMFraction is used modify the heap size and it is used as a denominator where the numerator is phys_mem. | |
# It seems that this value is a uint in the JVM code, thus can only specify 1 => 100%, 2 => 50%, 3 => 33.3%, 4 => 25% | |
# and so on. | |
# | |
# SerialGC is used here as it's likely that we'll be running many JVMs on the same host machine and it's also likely | |
# that the number of JVMs will outnumber the number of available processors. | |
# | |
# The max memory value obtained with these args seem to be okay for most memory limits. The exception is when the | |
# memory limit is set to 128MiB, in which case maxMemory returns roughly half. | |
ENTRYPOINT [ "/usr/bin/java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-XX:MaxRAMFraction=2", "-XX:+UseSerialGC", "-Xshare:off", "-cp", "/function/app/*:/function/runtime/*", "com.fnproject.fn.runtime.EntryPoint" ] |
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