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Bug 1096280 - docker top stopped working, cgroup path changed
Summary: docker top stopped working, cgroup path changed
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: docker
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
high
Target Milestone: rc
: ---
Assignee: Lokesh Mandvekar
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 1088125
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-05-09 14:59 UTC by Lukáš Doktor
Modified: 2019-03-06 00:44 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of: 1088125
Environment:
Last Closed: 2014-05-30 07:42:54 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Lukáš Doktor 2014-05-09 14:59:25 UTC 
+++ This bug was initially created as a clone of Bug #1088125 +++

Description of problem:
The `docker top` command stopped working, the path to cgroup processes had changed.


Version-Release number of selected component (if applicable):
docker-0.10.0-8.el7.x86_64
docker-io-0.10.0-2.fc20.x86_64

How reproducible:
always

Steps to Reproduce:
1. docker run -i fedora bash
2. docker top $NAME

Actual results:
[root@t530 ~]# docker top determined_jones 
2014/04/16 07:47:52 Error: open /sys/fs/cgroup/devices/system.slice/docker/93dfbd4d375cf026df215d87b5d93de8b0a9bd55094e33c2ca3322cd6afb53f1/tasks: no such file or directory

Expected results:
list of processes...

Additional info:
[root@t530 ~]# ls /sys/fs/cgroup/devices/system.slice/
cgroup.clone_children
cgroup.event_control
cgroup.procs
devices.allow
devices.deny
devices.list
docker-93dfbd4d375cf026df215d87b5d93de8b0a9bd55094e33c2ca3322cd6afb53f1.scope
notify_on_release
tasks

--- Additional comment from Lukas Doktor on 2014-05-05 03:46:55 EDT ---

The same bug is in upstream Docker version 0.10.0, build dc9c28f/0.10.0
Comment 2 Lukáš Doktor 2014-05-09 15:03:24 UTC 
The difference between Fedora and RHEL problem is, that RHEL tries to access:
docker top test_eoly 
2014/05/09 16:56:22 Error: open /sys/fs/cgroup/devices/docker-d6dec8258b30eaecaa96f6110a427d4c3bf40fe8ec03b91ed4f277f3d835c23c.scope/tasks: no such file or directory

And the directories are:
[root@t530 ~]# ls /sys/fs/cgroup/devices/system.slice/
cgroup.clone_children
cgroup.procs
devices.allow
devices.deny
devices.list
docker-d6dec8258b30eaecaa96f6110a427d4c3bf40fe8ec03b91ed4f277f3d835c23c.scope
notify_on_release
tasks

Note that this was executed on Fedora 20 with docker from collider, so the path problem might be incorrect. I'll retest this directly on RHEL later.
Comment 3 Lukáš Doktor 2014-05-09 16:11:31 UTC 
Retested on RHEL-7.0-20140507.0 with the same error:

[root@cisco-b200m1-04 ~]# docker top elegant_bohr
2014/05/09 12:09:06 Error: open /sys/fs/cgroup/devices/docker-a1c00b36178aaa4bd35a1aa60a8707569dd65ffcc1c6168f9af084779846af9a.scope/tasks: no such file or directory


[root@cisco-b200m1-04 ~]# ls /sys/fs/cgroup/devices/system.slice/
cgroup.clone_children  cgroup.procs   devices.deny  docker-a1c00b36178aaa4bd35a1aa60a8707569dd65ffcc1c6168f9af084779846af9a.scope  tasks
cgroup.event_control   devices.allow  devices.list  notify_on_release

[root@cisco-b200m1-04 ~]# ls /sys/fs/cgroup/devices
cgroup.clone_children  cgroup.event_control  cgroup.procs  cgroup.sane_behavior  devices.allow  devices.deny  devices.list  notify_on_release  release_agent  system.slice  tasks
Comment 5 Daniel Walsh 2014-05-19 20:33:33 UTC 
Fixed in docker-io-0.11.1-3.el7
Comment 6 Lukáš Doktor 2014-05-23 14:50:44 UTC 
Hi Daniel, Chris tested it successfully on docker-0.11.1-2.el7.x86_64. I tried docker-0.11.1-3.el7.x86_64 and today's the docker-0.11.1-5.el7.x86_64 and booth are failing. Did the patch slipped away?
Comment 7 Daniel Walsh 2014-05-23 17:21:12 UTC 
According to Lokesh the patch is in there.
Comment 8 Lukáš Doktor 2014-05-30 07:42:54 UTC 
yep, works fine with docker-0.11.1-6.el7.x86_64
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