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Bug 921328

Summary: The cgred service fails to start with an empty configuration file.
Product: Red Hat Enterprise Linux 6 Reporter: Jamie Duncan <jduncan>
Component: libcgroupAssignee: Peter Schiffer <pschiffe>
Status: CLOSED ERRATA QA Contact: Mike Gahagan <mgahagan>
Severity: high Docs Contact:
Priority: high    
Version: 6.3CC: ccui, chhudson, jsafrane, lnovich, ovasik, varekova
Target Milestone: rcKeywords: Patch
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Cause: cgred service was refusing to start if it's configuration file was missing or empty. however it was OK if file contained only comments Consequence: cgred service failed to start with empty configuration file Fix: remove explicit checks for existence of configuration file Result: cgred service starts with missing or empty configuration file
 Story Points: ---
Clone Of: Environment:
Last Closed: 2013-11-21 22:32:44 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 835616, 947775, 960070    
Attachments:
Description Flags
libcgroup-0.37-cgred-empty-config.patch none

Description Jamie Duncan 2013-03-14 02:43:04 UTC 
Description of problem:
If /etc/cgrules.conf is empty (but exists) cgred refuses to start.
If even a comment is present, it starts correctly.

Version-Release number of selected component (if applicable):
libcgroup-0.37-7.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.have an empty or non-existent /etc/cgrules.conf
2.attempt to start cgred service
3.
  
Actual results:
service fails to start 

Expected results:
service should start

Additional info:
# Empty File
Stopping CGroup Rules Engine Daemon...                          [  OK  ]
Starting CGroup Rules Engine Daemon: not configured        [FAILED]

Can you provide the results from

$ ls -l /etc/cgrules.conf

-rw-r--r-- 1 root root 0 Feb 22 18:30 /etc/cgrules.conf

When a comment is placed in /etc/cgrules.conf files (so there is
only one hash mark in the file) the service starts normally

# One hash mark

Stopping CGroup Rules Engine Daemon...                   [  OK  ]
Starting CGroup Rules Engine Daemon:                       [  OK  ]
Comment 3 Peter Schiffer 2013-06-19 11:26:08 UTC 
Created attachment 762873 [details]
libcgroup-0.37-cgred-empty-config.patch
Comment 12 Mike Gahagan 2013-09-12 15:52:40 UTC 
[root@dhcp137-133 initscript]# rpm -q libcgroup
libcgroup-0.40.rc1-2.el6.x86_64
[root@dhcp137-133 initscript]# rm /etc/cgrules.conf
rm: remove regular file `/etc/cgrules.conf'? y
[root@dhcp137-133 initscript]# service cgred restart # no cgrules.conf
Stopping CGroup Rules Engine Daemon...                     [  OK  ]
Starting CGroup Rules Engine Daemon:                       [  OK  ]
[root@dhcp137-133 initscript]# service cgred start # empty cgrules.conf
Starting CGroup Rules Engine Daemon:                       [  OK  ]
[root@dhcp137-133 initscript]# ps ax | grep cg
   13 ?        S      0:00 [cgroup]
28322 ?        Ss     0:00 /sbin/cgrulesengd -g cgred
28327 pts/2    S+     0:00 grep cg
[root@dhcp137-133 initscript]# service cgred restart # cgrules.conf only comments
Stopping CGroup Rules Engine Daemon...                     [  OK  ]
Starting CGroup Rules Engine Daemon:                       [  OK  ]

Fixed in libcgroup-0.40.rc1-2.el6.x86_64, this can be verified.
Comment 13 errata-xmlrpc 2013-11-21 22:32:44 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1685.html