container support not enabled due to required cgroup subsystems not found (original) (raw)

David Holmes david.holmes at oracle.com
Thu Mar 15 12:27:22 UTC 2018

Moving to hotspot-dev

On 15/03/2018 8:51 PM, ashutosh mehra wrote:

When I run jdk-10+46 build in a docker container, I don't see MaxHeapSize being adjusted based on container memory limit.

Command to run docker container with 2G memory, 2 CPUs: $ docker run -m2g --memory-swap=2g --cpus=2 -it --rm -v /home/ashu/data/builds/openjdk/jdk-10+46:/root/jdk-10 ubuntu:16.04 Once inside the container ran the following command: # /root/jdk-10//bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version | grep MaxHeapSize Output: sizet MaxHeapSize = 2015363072 {product} {ergonomic} openjdk version "10" 2018-03-20 OpenJDK Runtime Environment 18.3 (build 10+46) OpenJDK 64-Bit Server VM 18.3 (build 10+46, mixed mode) When I used -Xlog:os+container=trace option, I get following information: # /root/jdk-10//bin/java "-Xlog:os+container=trace" -version [0.001s][trace][os,container] OSContainer::init: Initializing Container Support [0.001s][debug][os,container] Required cgroup subsystems not found openjdk version "10" 2018-03-20 OpenJDK Runtime Environment 18.3 (build 10+46) OpenJDK 64-Bit Server VM 18.3 (build 10+46, mixed mode) Following subsystems are present in the docker container: # ls /sys/fs/cgroup/ blkio cpu cpuacct cpuacct,cpu cpuset devices freezer hugetlb memory netcls netprio netprio,netcls perfevent pids systemd As far as I understand, JVM is using only memory, cpu and cpuset subsystems which are present in my system. Not sure why is it reporting "Required cgroup subsystems not found". Any idea what could be wrong here? Are there other debug options to figure out what is going wrong?

What does /proc/self/mountinfo show?

David

Regards, Ashutosh Mehra

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