Question about how login stats are calculated on 12.04 LTS
If you install from the "minimal install" ISO you get a prompt near the end to enable automaigically applying security updates.
I usually elect for that option -- one of the other things that happens when you take that option is that you get a cute little login script that provides some interesting statistics along how many pending updates are available and if a restart is required. I find this mildy amusing, and other than the extra time it causes at login, never thught too much about it until I noticed this:
Code:
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.2.0-38-generic x86_64)
* Documentation: https://help.ubuntu.com/
System information as of Sat Mar 9 11:29:28 CST 2013
System load: 0.0 Processes: 98
Usage of /: 0.8% of 450.20GB Users logged in: 0
Memory usage: 1% IP address for bond0: xxx.xxx.xxx.xxx
Swap usage: 0%
=> /mnt/md0 is using 88.0% of 9.40TB
Graph this data and manage this system at https://landscape.canonical.com/
0 packages can be updated.
0 updates are security updates.
Last login: Sat Mar 9 10:49:34 2013 from
:~$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 472069424 3686732 444402868 1% /
/dev/md0p1 10095015976 8879129108 703089336 93% /mnt/md0
:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 451G 3.6G 424G 1% /
/dev/md0p1 9.5T 8.3T 671G 93% /mnt/md0
After a certain utilization point on any given system the login descript displays a usage indicator regarding the level of utilization -- in this case the login script is squawking about 88% of /dev/md0p1 being used.
runing 'df' or 'df -h' reveals utilization is actually a bit higher.
Not really a big deal, but it isn an interesting quirk. is this just the difference in calculating MiB vs MB?
Anyone have any experience with the set of packages that provide these login scripts? I know it's more than one package, as I tried to add it to a server without the option selected during installation.
Re: Question about how login stats are calculated on 12.04 LTS
Quote:
Originally Posted by
MakOwner
If you install from the "minimal install" ISO you get a prompt near the end to enable automaigically applying security updates.
I usually elect for that option -- one of the other things that happens when you take that option is that you get a cute little login script that provides some interesting statistics along how many pending updates are available and if a restart is required.
I'm not actually answering your question but this script has nothing to do with whether you select automatic updates or not.
I never choose to have automatic updates when I do a server installation but I still have this information displayed every time I log in.
For more information on the MOTD (message of the day) script see here...
https://help.ubuntu.com/10.04/serverguide/pam_motd.html
If you want to know exactly where the information is coming from you should take a look at the scripts in the /etc/update-motd.d folder, you may find an answer to your question here.
Re: Question about how login stats are calculated on 12.04 LTS
Sorry, but
Code:
$ expr 8879129108 \* 100 / 10095015976
87
$ echo $((8879129108*100/10095015976))
87
$ echo 'scale=1;8879129108*100/10095015976'|bc
87.9
Don't forget that 5% of space on each ext2/3/4 filesystem are reserved for root user. To see how many bytes are reserved for root, try
Code:
sudo dumpe2fs -h /dev/md0p1 2>/dev/null|sed -nr 's/^(Reserved block count|Block size): *//p'|paste -sd\*|bc
Re: Question about how login stats are calculated on 12.04 LTS
Interesting - it may not be associated witth that selection, but selecting 'basic server' and 'openssh' along with that option is the only way I have ever seen it.
I chased the scripts down once, but it was back when 10.04 was fairly new.
Re: Question about how login stats are calculated on 12.04 LTS
Quote:
Originally Posted by
schragge
Sorry, but
Code:
$ expr 8879129108 \* 100 / 10095015976
87
$ echo $((8879129108*100/10095015976))
87
$ echo 'scale=1;8879129108*100/10095015976'|bc
87.9
Don't forget that 5% of space on each ext2/3/4 filesystem are reserved for root user. To see, how many bytes are reserved for root, try
Code:
sudo dumpe2fs -h /dev/md0p1 2>/dev/null|sed -nr 's/^(Reserved block count|Block size): *//p'|paste -sd\*|bc
And that was the other thing I was thinking about.
Thanks for the method of calculating root reservation overhead!
Re: Question about how login stats are calculated on 12.04 LTS
Quote:
Originally Posted by
MakOwner
Thanks for the method of calculating root reservation overhead!
You're welcome. This even may be shortened as
Code:
sudo tune2fs -l /dev/md0p1|sed -nr 's/(R.*t|B.*e): *//p'|paste -sd\*|bc
but the first form is more readable. If the filesystem is mounted, it may be simplified further by using mount point instead of device name:
Code:
stat -fc'(%f-%a)*%S' /mnt/md0|bc
Re: Question about how login stats are calculated on 12.04 LTS
I've tracked down the scripts that display the info, they live in /usr/lib/python2.7/dist-packages/landscape/sysinfo/.
The relevant script for your question is disk.py.
My python isn't too good but I'm sure someone else can figure it out, the script is as follows...
Code:
from __future__ import division
import os
from twisted.internet.defer import succeed
from landscape.lib.disk import get_mount_info, get_filesystem_for_path
# List of filesystem types authorized when generating disk use statistics.
STABLE_FILESYSTEMS = set(
["ext", "ext2", "ext3", "ext4", "reiserfs", "ntfs", "msdos", "dos", "vfat",
"xfs", "hpfs", "jfs", "ufs", "hfs", "hfsplus"])
def format_megabytes(megabytes):
if megabytes >= 1024*1024:
return "%.2fTB" % (megabytes/(1024*1024))
elif megabytes >= 1024:
return "%.2fGB" % (megabytes/1024)
else:
return "%dMB" % (megabytes)
def usage(info):
total = info["total-space"]
used = total - info["free-space"]
return "%0.1f%% of %s" % ((used / total) * 100, format_megabytes(total))
class Disk(object):
def __init__(self, mounts_file="/proc/mounts", statvfs=os.statvfs):
self._mounts_file = mounts_file
self._statvfs = statvfs
def register(self, sysinfo):
self._sysinfo = sysinfo
def run(self):
main_info = get_filesystem_for_path("/home", self._mounts_file,
self._statvfs, STABLE_FILESYSTEMS)
if main_info is not None:
total = main_info["total-space"]
if total <= 0:
root_main_info = get_filesystem_for_path(
"/", self._mounts_file, self._statvfs, STABLE_FILESYSTEMS)
if root_main_info is not None:
total = root_main_info["total-space"]
main_info = root_main_info
if total <= 0:
main_usage = "unknown"
else:
main_usage = usage(main_info)
self._sysinfo.add_header("Usage of " + main_info["mount-point"],
main_usage)
else:
self._sysinfo.add_header("Usage of /home", "unknown")
seen_mounts = set()
seen_devices = set()
infos = list(get_mount_info(self._mounts_file, self._statvfs,
STABLE_FILESYSTEMS))
infos.sort(key=lambda i: len(i["mount-point"]))
for info in infos:
total = info["total-space"]
mount_seen = info["mount-point"] in seen_mounts
device_seen = info["device"] in seen_devices
seen_mounts.add(info["mount-point"])
seen_devices.add(info["device"])
if mount_seen or device_seen:
continue
if total <= 0:
# Some "virtual" filesystems have 0 total space. ignore them.
continue
used = ((total - info["free-space"]) / total) * 100
if used >= 85:
self._sysinfo.add_note("%s is using %s"
% (info["mount-point"], usage(info)))
return succeed(None)
Re: Question about how login stats are calculated on 12.04 LTS
landscape.lib.disk comes with the package landscape-common. get_mount_info calls os.statvfs.
Code:
Python 2.7.3 (default, Jan 2 2013, 13:56:14)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os, statvfs
>>> s=os.statvfs("/")
>>> print s[statvfs.F_BSIZE], s[statvfs.F_BLOCKS], s[statvfs.F_BFREE]
4096 2322270 501922
>>>
