Cadvisor: Could not configure a source for OOM detection, disabling OOM events

[wongchao]

rancher1.6

Ubuntu 16.04.2
4.4.0-62-generic
Docker version 17.12.1-ce, build 7390fc6
google/cadvisor:v0.32.0

volumn:
"/:/rootfs:ro",
"/var/run:/var/run:rw",
"/sys:/sys:ro",
"/var/lib/docker/:/var/lib/docker:ro",
"rancher-cni:/.r:ro"

logs:
2019/1/18 下午6:12:08W0118 10:12:08.685620 1 manager.go:349] Could not configure a source for OOM detection, disabling OOM events: open /dev/kmsg: no such file or directory

[dashpole]

maybe you need to mount /dev/kmsg into the container?

[CpuID]

Tried that, same outcome. Tried it RO and RW.

[tommmlij]

Run the cadvisor container with privileged: true

[torhoehn]

@tommmlij That was working for me.

[lizibin]

@wongchao 我也遇到同样的问题，你解决了吗？

[ZVilusinsky]

privileged: true does not resolve it on Centos 7.7

Metrics flow and work without privileged, but following running instructions results in Could not configure a source for OOM detection, disabling OOM events: open /dev/kmsg: no such file or directory
Mounting /dev instead of /dev/disk changes it to Could not configure a source for OOM detection, disabling OOM events: open /dev/kmsg: operation not permitted
Turning privileged on/off does not seem to affect it in any way.

edit: well, found something. Even though compose reference mentions it, and the feature exists, it is still not merged, so swarm does not yet support privileged https://github.com/docker/swarmkit/issues/1030

[jamesdboone]

Probably better to use --device tag to mount device into container than using privileged...

[shrinidhi111]

Run the cadvisor container with privileged: true

How do I run it as privileged? I am already running it as sudo.

[dashpole]

https://kubernetes.io/docs/concepts/workloads/pods/pod/#privileged-mode-for-pod-containers

[katarzyna-z]

@dashpole Do you think that we should add --privileged to example command of running cAdvisor in docker in https://github.com/google/cadvisor/blob/master/README.md?

[katarzyna-z]

I see that issue don't appear if /dev/kmsg is added to container, for example:

VERSION=v0.35.0 # use the latest release version from https://github.com/google/cadvisor/releases
sudo docker run \
  --volume=/:/rootfs:ro \
  --volume=/var/run:/var/run:ro \
  --volume=/sys:/sys:ro \
  --volume=/var/lib/docker/:/var/lib/docker:ro \
  --volume=/dev/disk/:/dev/disk:ro \
  --publish=8080:8080 \
  --name=cadvisor \
  --device=/dev/kmsg \
  gcr.io/google-containers/cadvisor:$VERSION