使用cgroups来控制内存使用

[root@cent6 Desktop]# free -m
             total       used       free     shared    buffers     cached
Mem:          2006        484       1522          0         29        175
-/+ buffers/cache:        279       1727
Swap:         4031          0       4031
[root@cent6 Desktop]# 

[root@cent6 Desktop]# free -m
             total       used       free     shared    buffers     cached
Mem:          2006       1224        782          0         33        878
-/+ buffers/cache:        312       1694
Swap:         4031          0       4031
[root@cent6 Desktop]# 

[root@cent6 Desktop]# service cgconfig status
Stopped


#mount -t cgroup -o memory memcg /cgroup 

# mkdir /cgroup/GroupA  
# echo 10M > /cgroup/GroupA/memory.limit_in_bytes  
# echo $$ > /cgroup/GroupA/tasks 

[root@cent6 Desktop]# free -m
             total       used       free     shared    buffers     cached
Mem:          2006        481       1525          0         29        174
-/+ buffers/cache:        276       1729
Swap:         4031          0       4031
[root@cent6 Desktop]#

[root@cent6 Desktop]# free -m
             total       used       free     shared    buffers     cached
Mem:          2006        512       1494          0         32        186
-/+ buffers/cache:        293       1713
Swap:         4031          0       4031
[root@cent6 Desktop]#

[postgres@cent6 Desktop]$ cat /etc/cgconfig.conf
#
#  Copyright IBM Corporation. 2007
#
#  Authors:    Balbir Singh <balbir@linux.vnet.ibm.com>
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of version 2.1 of the GNU Lesser General Public License
#  as published by the Free Software Foundation.
#
#  This program is distributed in the hope that it would be useful, but
#  WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See man cgconfig.conf for further details.
#
# By default, mount all controllers to /cgroup/<controller>

mount {
    cpuset    = /cgroup/cpuset;
    cpu    = /cgroup/cpu;
    cpuacct    = /cgroup/cpuacct;
    memory    = /cgroup/memory;
    devices    = /cgroup/devices;
    freezer    = /cgroup/freezer;
    net_cls    = /cgroup/net_cls;
    blkio    = /cgroup/blkio;
}

group test1 {
    perm {
          task{
              uid=postgres;
              gid=postgres;
          }
          
          admin{
             uid=root;
             gid=root; 
          }

    } memory {
       memory.limit_in_bytes=30M;
    }
}

[postgres@cent6 Desktop]$ 

[postgres@cent6 Desktop]$ cat /etc/cgrules.conf
# /etc/cgrules.conf
#
#Each line describes a rule for a user in the forms:
#
#<user>            <controllers>        <destination>
#<user>:<process name>    <controllers>        <destination>
#
#Where:
# <user> can be:
#        - an user name
#        - a group name, with @group syntax
#        - the wildcard *, for any user or group.
#        - The %, which is equivalent to "ditto". This is useful for
#          multiline rules where different cgroups need to be specified
#          for various hierarchies for a single user.
#
# <process name> is optional and it can be:
#     - a process name
#     - a full command path of a process
#
# <controller> can be:
#      - comma separated controller names (no spaces)
#      - * (for all mounted controllers)
#
# <destination> can be:
#      - path with-in the controller hierarchy (ex. pgrp1/gid1/uid1)
#
# Note:
# - It currently has rules based on uids, gids and process name.
#
# - Don't put overlapping rules. First rule which matches the criteria
#   will be executed.
#
# - Multiline rules can be specified for specifying different cgroups
#   for multiple hierarchies. In the example below, user "peter" has
#   specified 2 line rule. First line says put peter's task in test1/
#   dir for "cpu" controller and second line says put peter's tasks in
#   test2/ dir for memory controller. Make a note of "%" sign in second line.
#   This is an indication that it is continuation of previous rule.
#
#
#<user>      <controllers>      <destination>
#
#john          cpu        usergroup/faculty/john/
#john:cp       cpu        usergroup/faculty/john/cp
#@student      cpu,memory    usergroup/student/
#peter           cpu        test1/
#%           memory        test2/
#@root            *        admingroup/
#*        *        default/
# End of file
 postgres      memory           test1/
#
[postgres@cent6 Desktop]$ 

[postgres@cent6 Desktop]$ free -m
             total       used       free     shared    buffers     cached
Mem:          2006        381       1625          0         25        134
-/+ buffers/cache:        221       1785

[postgres@cent6 Desktop]$ wget http://centos.arcticnetwork.ca/6.4/isos/x86_64/CentOS-6.4-x86_64-LiveCD.iso

[postgres@cent6 Desktop]$ free -m
             total       used       free     shared    buffers     cached
Mem:          2006        393       1613          0         28        141
-/+ buffers/cache:        224       1782
Swap:         4031         67       3964
[postgres@cent6 Desktop]$