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

Baesken, Matthias matthias.baesken at sap.com
Thu Mar 15 12:55:42 UTC 2018

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

Hi, in jdk10

"cpu,cpuacct"

Is checked as well , see

http://hg.openjdk.java.net/jdk/jdk10/file/b09e56145e11/src/hotspot/os/linux/osContainer_linux.cpp

( but unfortunately not cpuacct,cpu ). This might cause the message :

[0.001s][debug][os,container] Required cgroup subsystems not found

In jdk11 both "cpu,cpuacct" and "cpuacct,cpu" are checked . Jdk11 has also a bit better logging , so I think it would tell you what subsystem is not found . Could you maybe rerun with jdk11 ?

Thanks, Matthias

-----Original Message----- From: jdk-dev [mailto:jdk-dev-bounces at openjdk.java.net] On Behalf Of ashutosh mehra Sent: Donnerstag, 15. März 2018 11:52 To: jdk-dev at openjdk.java.net Subject: container support not enabled due to required cgroup subsystems not found

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? Regards, Ashutosh Mehra

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