Hi,
I have a system where the sensor fails to detect any running container, both when using docker or kubernetes directly.
When looking at the source code, I see that the sensor
- looks for containers in the subdirectories of the perf_event cgroup
ll /sys/fs/cgroup/perf_event/ (can be changed with the -p flag
- try to detect a type based on the path in this directory see
|
target_detect_type(const char *cgroup_path) |
- then, for docker and kubernetes, validates the type based on an expected path 👍
perf_event/docker/... for dockerperf_event/kubepods/... for kubernetes
- If the validation fails, the container is ignored
On my system,
- kubernetes pods appear in
/sys/fs/cgroup/perf_event/kubepods.slice/ , are detected but fail type validation
- docker containers appear in
/sys/fs/cgroup/perf_event/system.slice/ are detected but fail type validation too
As a consequences, no container is monitored.
Maybe we could bypass type detection and file validation altogether, as I proposed in the old #2 PR ? That should solve this issue.
Finally, I have no idea on why the /sys/fs/cgroup/perf_event the system is diffferent on this system. It's a centos 7.2, I usually use debian and ubuntu systems and never had this issue before.
Please let me know if I can add something useful or if you have any idea to get me started on this issue.
Hi,
I have a system where the sensor fails to detect any running container, both when using docker or kubernetes directly.
When looking at the source code, I see that the sensor
ll /sys/fs/cgroup/perf_event/(can be changed with the-pflaghwpc-sensor/src/target.c
Line 56 in adfcb65
perf_event/docker/...for dockerperf_event/kubepods/...for kubernetesOn my system,
/sys/fs/cgroup/perf_event/kubepods.slice/, are detected but fail type validation/sys/fs/cgroup/perf_event/system.slice/are detected but fail type validation tooAs a consequences, no container is monitored.
Maybe we could bypass type detection and file validation altogether, as I proposed in the old #2 PR ? That should solve this issue.
Finally, I have no idea on why the
/sys/fs/cgroup/perf_eventthe system is diffferent on this system. It's a centos 7.2, I usually use debian and ubuntu systems and never had this issue before.Please let me know if I can add something useful or if you have any idea to get me started on this issue.