Difference between revisions of "Disk Limits and Quota"

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(copied dlimits from util-vserver homepage and linked to it.)
 
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See dlimits on the util-vserver homepage http://www.nongnu.org/util-vserver/doc/conf/configuration.html or the copy below
+
== Introduction ==
 +
We call ''Disk Limit'' a disk space limit in a filesystem for one context (i.e. VServer). If you are interested in using user/group quotas inside a VServer, this is not the right place, look at the [[Quotas]] page.
  
#  /etc/vservers/vserver-name/dlimits
+
Of course, you can also use a dedicated partition (or logical volume) for each guest, which is another way to limit disk space usage per guest.
  
    * /etc/vservers/vserver-name/dlimits/dlimit
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== Activating disk limits ==
          o directory
+
 
            The directory to which the limit should be applied
+
For VServer version 2.0, please read http://oldwiki.linux-vserver.org/Disk+Limits
          o inodes_total
+
 
            The amount of inodes this vserver should be limited to
+
For VServer 2.2+, the procedure is nearly the same, only the mount option has changed:
          o reserved
+
 
            How much space (percentage-wise) should be reserved for the root user
+
# Activate the XID tagging on the filesystem hosting the VServer, using the ''tag'' mount option. You cannot use the ''remount'' option to add the tag on an already mounted filesystem. '''Be warn''', it is not advised to use it on the root filesystem! In the next example, we use the <tt>/dev/sdb1</tt> partition to host all the guests, under the <tt>/vservers</tt> directory <pre>mount -o tag /dev/sdb1 /vservers</pre>
          o space_total
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# Consider modifying your <tt>/etc/fstab</tt> file if necessary, to make the mount option persist across reboots
            The amount of space this vserver should be limited to (measured in blocks of 1024 bytes)
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# Tag the files belonging to the VServer with its XID <pre>chxid -URx -c vs_name /vservers/vs_name </pre>
 +
# Write the limits under the <tt>/etc/vservers/vs_name/dlimits</tt> directory :
 +
## Create this directory if necesary
 +
## Create one sub-directory for each filesystem (in most cases, you should have only one), using any identifier (for example <tt>root</tt>)
 +
## Under <tt>/etc/vservers/vs_name/dlimits/root/</tt> create the following files :
 +
### <tt>directory</tt> : contains the directory to which the limit should be applied (for example <tt>/vservers/vs_name</tt>)
 +
### <tt>inodes_total</tt> : the amount of inodes this vserver should be limited to
 +
### <tt>reserved</tt> : how much space (percentage-wise) should be reserved for the root user
 +
### <tt>space_total</tt> : the amount of space this vserver should be limited to (measured in blocks of 1024 bytes)
 +
 
 +
== Controling disk limits ==
 +
 +
After starting your VServer, you can control the actual limit using the ''vdlimit'' command (in this example, 300 is the context number associated with ''vs_name'') :
 +
# vdlimit --xid vs_name /vservers
 +
300 /vservers
 +
space_used=154604
 +
space_total=204800
 +
inodes_used=7834
 +
inodes_total=100000
 +
reserved=5
 +
 +
You can also use the ''vdu'' command to count space or inodes used by a specific guest
 +
# vdu --xid vs_name --space /vservers
 +
/vservers 154604
 +
# vdu --xid vs_name --inodes /vservers
 +
/vservers 7834
 +
 +
If you just want to update disk usage of a guest activating disk limits, then you can use this script.
 +
It will count the usage of all files and update the limits:
 +
<pre>
 +
#/bin/sh
 +
_dir=/var/lib/vservers
 +
if [ ! -d $_dir/$1 ]; then
 +
echo no such vserver
 +
exit 1;
 +
fi;
 +
chxid -URx -c $1 $_dir/$1
 +
vdlimit --xid $1 -s space_used=$(vdu --xid $1 --space $_dir/$1 | cut -d" " -f2) $_dir/$1
 +
vdlimit --xid $1 -s inodes_used=$(vdu --xid $1 --inode $_dir/$1 | cut -d" " -f2) $_dir/$1
 +
</pre>
 +
 +
== Removing disk limits ==
 +
To remove disk limits, remove the <tt>/etc/vservers/vs_name/dlimits/root</tt> directory '''and''' remove the limits with the following command
 +
# vdlimit --xid vs_name --remove /vservers
 +
 
 +
== More information ==
 +
* See also ''dlimits'' on the util-vserver homepage http://www.nongnu.org/util-vserver/doc/conf/configuration.html
 +
* For information about limiting diskspace with XFS, please see the [[XFS]] page.
 +
 
 +
[[Category:Documentation]]

Latest revision as of 20:06, 21 October 2011

Contents

[edit] Introduction

We call Disk Limit a disk space limit in a filesystem for one context (i.e. VServer). If you are interested in using user/group quotas inside a VServer, this is not the right place, look at the Quotas page.

Of course, you can also use a dedicated partition (or logical volume) for each guest, which is another way to limit disk space usage per guest.

[edit] Activating disk limits

For VServer version 2.0, please read http://oldwiki.linux-vserver.org/Disk+Limits

For VServer 2.2+, the procedure is nearly the same, only the mount option has changed:

  1. Activate the XID tagging on the filesystem hosting the VServer, using the tag mount option. You cannot use the remount option to add the tag on an already mounted filesystem. Be warn, it is not advised to use it on the root filesystem! In the next example, we use the /dev/sdb1 partition to host all the guests, under the /vservers directory
    mount -o tag /dev/sdb1 /vservers
  2. Consider modifying your /etc/fstab file if necessary, to make the mount option persist across reboots
  3. Tag the files belonging to the VServer with its XID
    chxid -URx -c vs_name /vservers/vs_name 
  4. Write the limits under the /etc/vservers/vs_name/dlimits directory :
    1. Create this directory if necesary
    2. Create one sub-directory for each filesystem (in most cases, you should have only one), using any identifier (for example root)
    3. Under /etc/vservers/vs_name/dlimits/root/ create the following files :
      1. directory : contains the directory to which the limit should be applied (for example /vservers/vs_name)
      2. inodes_total : the amount of inodes this vserver should be limited to
      3. reserved : how much space (percentage-wise) should be reserved for the root user
      4. space_total : the amount of space this vserver should be limited to (measured in blocks of 1024 bytes)

[edit] Controling disk limits

After starting your VServer, you can control the actual limit using the vdlimit command (in this example, 300 is the context number associated with vs_name) :

  1. vdlimit --xid vs_name /vservers

300 /vservers space_used=154604 space_total=204800 inodes_used=7834 inodes_total=100000 reserved=5

You can also use the vdu command to count space or inodes used by a specific guest

  1. vdu --xid vs_name --space /vservers

/vservers 154604

  1. vdu --xid vs_name --inodes /vservers

/vservers 7834

If you just want to update disk usage of a guest activating disk limits, then you can use this script. It will count the usage of all files and update the limits:

 
#/bin/sh	 
_dir=/var/lib/vservers	 
if [ ! -d $_dir/$1 ]; then	 
	echo no such vserver	 
	exit 1;	 
fi;	 
chxid -URx -c $1 $_dir/$1	 
vdlimit --xid $1 -s space_used=$(vdu --xid $1 --space $_dir/$1 | cut -d" " -f2) $_dir/$1	 
vdlimit --xid $1 -s inodes_used=$(vdu --xid $1 --inode $_dir/$1 | cut -d" " -f2) $_dir/$1	 

[edit] Removing disk limits

To remove disk limits, remove the /etc/vservers/vs_name/dlimits/root directory and remove the limits with the following command

  1. vdlimit --xid vs_name --remove /vservers

[edit] More information

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