in order to turn on the ls colors on your debian server for root user, just edit the /root/.bashrc file and uncomment there the following lines:
export LS_OPTIONS=’–color=auto’
eval “`dircolors`”
alias ls=’ls $LS_OPTIONS’
save and apply the new settings:
source ~/.bashrc
that’s all 
if you want Linux machine to use less swap you can tune it by changing the value of:
/proc/sys/vm/swappiness
by default it’s set to ’60′, you can decrease it to make it use less swap memory, this means that swap memory will be more used “when needed only”.
Change the value using this command:
echo 30 > /proc/sys/vm/swappiness
Disk IO and usage can be checked very easily via ssh, currently the bandwidth usage is 82mbit. IO wait can be checked using the ‘vmstat 1‘ command and looking on the pre-last column called ‘wa’:
procs ———–memory———- —swap– —–io—- –system– —–cpu——
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 1 476 8209760 17060 6923844 0 0 550 22 1 0 10 6 78 7 0
2 2 476 8176176 17152 6934184 0 0 5552 0 7435 2960 26 5 61 8 0
2 0 476 8198232 17160 6938080 0 0 2788 0 6260 2412 14 2 83 1 0
1 1 476 8189900 17184 6947160 0 0 3500 0 7751 2857 22 3 72 3 0
2 0 476 8147572 17192 6963164 0 0 3188 264 10083 3223 24 4 69 3 0
1 0 476 8171132 17208 6966848 0 0 2924 0 5948 2234 18 2 78 2 0
1 1 476 8166708 17220 6972064 0 0 1960 0 6731 2774 15 3 80 2 0
2 1 476 8133964 17236 6982200 0 0 3164 0 8228 3292 18 5 73 4 0
1 0 476 8128256 17252 6986012 0 0 3716 0 5876 2995 21 12 65 3 0
1 2 476 8102740 17336 6990420 0 0 2420 636 6364 3884 22 12 59 8 0
As you can see, its varies from 0-8 which is normal, when IO more than 20-30 for long time means IO is in moderate usage, when its over 50 it is high.
Another command to check disk utilization is ‘iostat –dx 5‘, it calculates 5 seconds disk resources utilization:
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 18.60 9.80 114.00 8.00 8777.60 142.40 73.11 1.65 13.78 5.44 66.32
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 18.60 9.80 114.00 8.00 8777.60 142.40 73.11 1.65 13.78 5.44 66.32
dm-0 0.00 0.00 131.80 17.80 8696.00 142.40 59.08 1.95 13.27 4.43 66.34
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 27.40 5.00 110.20 7.20 8624.00 97.60 74.29 2.06 17.53 5.88 69.02
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 27.40 5.00 110.20 7.20 8624.00 97.60 74.29 2.06 17.53 5.88 69.02
dm-0 0.00 0.00 138.40 12.20 8648.00 97.60 58.07 2.96 19.65 4.58 69.00
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 21.16 5.79 122.36 6.39 9203.99 97.41 72.25 1.88 14.63 5.23 67.33
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 21.16 5.79 122.36 6.39 9203.99 97.41 72.25 1.88 14.63 5.23 67.33
dm-0 0.00 0.00 142.71 12.18 9180.04 97.41 59.90 2.36 15.25 4.35 67.31
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
the last column says about 57-65% utilization of the disks, which is normal at 100mbit (the current bandwidth is 100mbit now).
Another test can be done at rush hours to check the utilization, usually SATA disks in RAID 1 configuration can handle 150-250mbit (depends on number of concurrent connections).
I’ve played with the nice and clear Craig Brass Kayako API, and added some extensions to allow the following remote functions:
CreateUser, UpdatePassword, DeleteUser
get the patch from here: http://interhost.co.il/api.class.patch
installation: patch -p0 < api.class.patch
and also apply this patch:
http://interhost.co.il/wsdl.patch
install:
patch -p0 < wsdl.patch
location: integrationapi/lib
and I also extended the example (api client), get it from here:
http://www.interhost…ako.api.php.txt
usage example:
http://api.caller.com/kayako.api.php?cmd=updateEmailAddress&oldEmail=old@email.com&newEmail=new@email.com&api_password=cleartext
interface: GET/POST
usage: kayako.api.php?cmd=<command>..args..&api_password=<api_password>
Availble commands:
cmd=updateEmailAddress
a1=oldEmail
a2=newEmail
cmd=changePassword
a1=email
a2=newpassword
cmd=deleteUser
a1=email
cmd=registerUser
a1=email
a2=userpassword
a3=fullname
any comments will be appriciated.
p.s its a proof of concept example, use on your own responsibility only.
thanks
I’ve created this patch for Lighttpd 1.4.19 (tested and compiled on Debian Lenny amd64). This patch adds configuration option:
‘connection.burst’
You should use it only with:
‘connection.kbytes-per-second’ setting.
Example:
connection.kbytes-per-second = 100
connection.burst = 50
In this example user will get 50 seconds fast-start and will be throttled down to 100KBp/s after fast start “burst” download of first 50sec.
It’s very useful for letting fast speed for downloading small files or for usage for FLV streaming when you like to give fast buffer burst speed and then throttle down.
I wrote this patch after looked long time in Google and had unfortune expirience with LARTC ‘s tools.
I hope this will be useful for you, for any comments, questions or bugs please write me a note.
Download:
http://www.debian.co.il/2009/09/lighttpd-burst-aka-faststart-patch/lighttpd-1419-burst/
Installation on Debian:
cd /usr/local/src/
apt-get source lighttpd
cd lighttpd-1.4.19
wget http://www.debian.co.il/wp-content/uploads/2009/09/lighttpd-1419-burst.patch
patch -p0 < lighttpd-1419-burst.patch
now compile and configure:
./configure
make
make install
I want to talk about the first steps i do when i install a new clean debian lenny, well first thing i want to feel comfort that i can build anything i want therefore lets install some build essential package, but before lets edit our /etc/apt/sources.apt file, oups we need a vim with colors, but hell whats that creepy sound when i reach the start with delete. Ok ok, lets start from scratch.
List of packages that every lenny server should include for my opinion:
apt-get install vim build-essential fakeroot psmisc
now edit /etc/apt/sources.apt
change:
deb http://debian.co.il/debian/ lenny main
deb-src http://debian.co.il/debian/ lenny main
to:
deb http://debian.co.il/debian/ lenny main non-free
deb-src http://debian.co.il/debian/ lenny main non-free
now run:
apt-get update && apt-get upgrade
now:
apt-get install unrar
lets add some colors to vim now:
cat > ~/.vimrc
syntax on
^D
vim /etc/inputrc +21
uncomment “set bell-style none”
now lets add some colors to root:
vim /root/.bashrc
uncomment those:
export LS_OPTIONS=’–color=auto’
eval “`dircolors`”
alias ls=’ls $LS_OPTIONS’
and add: alias grep=’grep –color’
cool, now just exit and relogin back again.
updatedb
thats all for now.
Our mirror is fully updated and now also contains AMD64 repositories for debian packaged and Debian ISO mirror with i386 and amd64 aswell!
Now our mirror is running on Lighttpd backend with lua support for rewriting clean urls.
debian AMD64 DVD: http://www.debian.co.il/debian-cd/current/amd64/iso-dvd/
Enjoy!
The sync from the primary Debian mirror ended today, grab your Lenny ISOs from:
http://debian.co.il/debian-cd/
Netinstall ISO:
http://debian.co.il/debian-cd/current/i386/iso-cd/debian-500-i386-netinst.iso
amd64 will be added soon.
Enjoy.
Useful and cool Linux tips collection:
1. Debian add ip address:
auto eth0:0
iface eth0:0 inet static
address 192.168.1.41
netmask 255.255.255.0
broadcast 192.168.1.255
2. Find modified lately file:
find . -mtime -1 -print
3. Find information about memory slots, speed, type etc’ (requires package lshw):
lshw | grep *-memory -A 40
4. Find DDOS! Find and sort connections by source ip:
netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n
5. Remove annoying system bell:
echo ‘set bell-style none’ >> ~/.inputrc
6. Trying to rm and getting ‘list too long’ ? try this:
find . | xargs rm
7. Extract only numbers from a string:
xxxxx/545454/xxxxx —> 545454
cat list.txt | sed ‘s/.*\/\([0-9]*\)*\/.*/\1/g’
8. Use colors in vim:
cat > ~/.vimrc
syntax on
^D
To be updated!
Debian Lenny is officially out !
Syncing mirrors in progress…
Debian GNU/Linux 5.0 released
February 14th, 2009The Debian Project is pleased to announce the official release of Debian GNU/Linux version 5.0 (codenamed Lenny
) after 22 months of constant development. Debian GNU/Linux is a free operating system which supports a total of twelve processor architectures and includes the KDE, GNOME, Xfce, and LXDE desktop environments. It also features compatibility with the FHS v2.3 and software developed for version 3.2 of the LSB.
Debian GNU/Linux runs on computers ranging from palmtops and handheld systems to supercomputers, and on nearly everything in between. A total of twelve architectures are supported: Sun SPARC (sparc), HP Alpha (alpha), Motorola/IBM PowerPC (powerpc), Intel IA-32 (i386), IA-64 (ia64), HP PA-RISC (hppa), MIPS (mips, mipsel), ARM (arm, armel), IBM S/390 (s390), and AMD64 and Intel EM64T (amd64).
Debian GNU/Linux 5.0 Lenny
adds support for Marvell’s Orion platform which is used in many storage devices. Supported storage devices include the QNAP Turbo Station series, HP Media Vault mv2120, and Buffalo Kurobox Pro. Additionally, Lenny
now supports several Netbooks, in particular the Eee PC by Asus. Lenny
also contains the build tools for Emdebian which allow Debian source packages to be cross-built and shrunk to suit embedded ARM systems.
Debian GNU/Linux 5.0 Lenny
includes the new ARM EABI port, armel
. This new port provides a more efficient use of both modern and future ARM processors. As a result, the old ARM port (arm) has now been deprecated.
Debian GNU/Linux 5.0 Lenny
is dedicated to Thiemo Seufer, a Debian Developer who died on December 26th, 2008 in a tragic car accident. Thiemo was involved in Debian in many ways. He has maintained several packages and was the main supporter of the Debian port to the MIPS architectures. He was also a member of our kernel team, as well as a member of the Debian Installer team. His contributions reached far beyond the Debian project. He also worked on the MIPS port of the Linux kernel, the MIPS emulation of qemu, and far too many smaller projects to be named here.
Thiemo’s work, commitment, broad technical knowledge and ability to share this with others will be missed. Thiemo’s contributions will not be forgotten. The high standards of his work make it hard to pick up.