[ovirt-users] Empty cgroup files on centos 7.3 host

[Yaniv Kaul]

On Mon, Jun 26, 2017 at 11:03 PM, Florian Schmid <fschmid at ubimet.com> wrote:

> Hi,
>
> I wanted to monitor disk IO and R/W on all of our oVirt centos 7.3
> hypervisor hosts, but it looks like that all those files are empty.
>

We have a very nice integration with Elastic based monitoring and logging -
why not use it.
On the host, we use collectd for monitoring.
See
http://www.ovirt.org/develop/release-management/features/engine/metrics-store/

Y.


> For example:
> ls -al /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2d14\\
> x2dHostedEngine.scope/
> insgesamt 0
> drwxr-xr-x.  2 root root 0 30. Mai 10:09 .
> drwxr-xr-x. 16 root root 0 26. Jun 09:25 ..
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_merged
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_merged_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_queued
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_queued_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_bytes
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_bytes_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_serviced
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_serviced_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_time
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_time_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_wait_time
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_wait_time_recursive
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.leaf_weight
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.leaf_weight_device
> --w-------.  1 root root 0 30. Mai 10:09 blkio.reset_stats
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.sectors
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.sectors_recursive
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.io_service_bytes
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.io_serviced
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.read_bps_device
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.read_iops_device
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.write_bps_device
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.write_iops_device
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.time
> -r--r--r--.  1 root root 0 30. Mai 10:09 blkio.time_recursive
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.weight
> -rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.weight_device
> -rw-r--r--.  1 root root 0 30. Mai 10:09 cgroup.clone_children
> --w--w--w-.  1 root root 0 30. Mai 10:09 cgroup.event_control
> -rw-r--r--.  1 root root 0 30. Mai 10:09 cgroup.procs
> -rw-r--r--.  1 root root 0 30. Mai 10:09 notify_on_release
> -rw-r--r--.  1 root root 0 30. Mai 10:09 tasks
>
>
> I thought, I can get my needed values from there, but all files are empty.
>
> Looking at this post: http://lists.ovirt.org/pipermail/users/2017-January/
> 079011.html
> this should work.
>
> Is this normal on centos 7.3 with oVirt installed? How can I get those
> values, without monitoring all VMs directly?
>
> oVirt Version we use:
> 4.1.1.8-1.el7.centos
>
> BR Florian
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> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
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