linux script to print out memory size

head -n1 /proc/meminfo | awk '

  BEGIN {}
  { TOTAL  = $2;  }

  END {

    print "Total memory: " TOTAL;

  }'

remove "Antispyware soft" virus

1, The virus is in this folder
%Documents and Settings%\[UserName]\Local Settings\Application Data\[random characters ]\[random characters]tssd.exe
C:\Documents and Settings\Chang\Local Settings\Application Data

You cannot delete this folder, but you can change the folder name.
Try to rename the folder and reboot your pc.

2, reboot your pc and go to safe mode

3, update your regedit
Here is the reference link:
http://www.2-viruses.com/remove-antispyware-soft

4, fuck  Antispyware soft

dump mysql record into a txt file - under linux

step 1 : create a sql file wg.sql

SELECT signature FROM sig_db.signatures  ;

Step 2: create shell script file: wg.sh

mysql -N -u yourusername -pyourpassword sig_db < wg.sql > wg.rules

Step 3: run wg.sh
./wg.sh

view access log, exclude google and yahoo

grreg@abc:~$ sudo tail -f /var/log/apache2/access.log | grep -v yahoo | grep -v google

reverse mapping checking getaddrinfo

This is dictionary attack - literally a machine trying to connect and login over and over again using usernames and passwords from a dictionary.


In this situation you can create a collection of firewalling rules which will deny access from remote clients who attempt to connect "too many" times.

If you have an existing firewall in place, using iptables, then adding the rules is very straightforward.
The way the recent module works is fairly straightforward, you basically add IP addresses to a list, which can then be used in the future to test connection attempts against. This allows you to limit the number of connections against either a number of seconds, or connection attempts. In our example we'll do both.

An example is probably the simplest way to illustrate how it works. The following two rules will limit incoming connections to port 22 to no more than 3 attemps in five minutes - an more than that will be dropped:



   sudo iptables -I INPUT -p tcp --dport 22  -m state --state NEW -m recent --set
   sudo iptables -L
   sudo iptables -I INPUT -p tcp --dport 22  -m state --state NEW -m recent --update --seconds 300 --hitcount 4 -j DROP



============ log file:  sudo less /var/log/auth.log  ==================
Apr 15 02:10:44 SS sshd[23278]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!
Apr 15 02:10:44 SS sshd[23278]: Invalid user rfmngr from 200.123.146.53
Apr 15 02:10:44 SS sshd[23278]: pam_unix(sshd:auth): check pass; user unknown
Apr 15 02:10:44 SS sshd[23278]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=200.123.146.53
Apr 15 02:10:46 SS sshd[23278]: Failed password for invalid user rfmngr from 200.123.146.53 port 46864 ssh2
Apr 15 02:10:47 SS sshd[23281]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!
Apr 15 02:10:47 SS sshd[23281]: Invalid user sales from 200.123.146.53
Apr 15 02:10:48 SS sshd[23281]: pam_unix(sshd:auth): check pass; user unknown
Apr 15 02:10:48 SS sshd[23281]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=200.123.146.53
Apr 15 02:10:49 SS sshd[23281]: Failed password for invalid user sales from 200.123.146.53 port 47024 ssh2
Apr 15 02:10:51 SS sshd[23283]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!
Apr 15 02:10:51 SS sshd[23283]: Invalid user recruit from 200.123.146.53
Apr 15 02:10:51 SS sshd[23283]: pam_unix(sshd:auth): check pass; user unknown
Apr 15 02:10:51 SS sshd[23283]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=200.123.146.53
Apr 15 02:10:53 SS sshd[23283]: Failed password for invalid user recruit from 200.123.146.53 port 47137 ssh2
Apr 15 02:10:54 SS sshd[23285]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!
Apr 15 02:10:54 SS sshd[23285]: Invalid user alias from 200.123.146.53
Apr 15 02:10:54 SS sshd[23285]: pam_unix(sshd:auth): check pass; user unknown
Apr 15 02:10:54 SS sshd[23285]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=200.123.146.53
Apr 15 02:10:56 SS sshd[23285]: Failed password for invalid user alias from 200.123.146.53 port 47248 ssh2
Apr 15 02:10:57 SS sshd[23287]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!
Apr 15 02:10:57 SS sshd[23287]: Invalid user office from 200.123.146.53
Apr 15 02:10:57 SS sshd[23287]: pam_unix(sshd:auth): check pass; user unknown
Apr 15 02:10:57 SS sshd[23287]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=200.123.146.53
Apr 15 02:11:00 SS sshd[23287]: Failed password for invalid user office from 200.123.146.53 port 47357 ssh2
Apr 15 02:11:01 SS sshd[23289]: reverse mapping checking getaddrinfo for customer-static-123-146-53.iplannetworks.net [200.123.146.53] failed - POSSIBLE BREAK-IN ATTEMPT!

install fio - linux check disk IO

1,  yum install libaio  libaio-devel


2, download and install fio

wget http://freshmeat.net/urls/3aa21b8c106cab742bf1f20d60629e3f
tar zxvf fio-1.38.tar.gz

3,  cd fio-1.38

make

make install

4, create fio test file

 vim random-read-test.fio

 fio random-read-test.fio

 mkdir /tmp/fio-testing/

 mkdir /tmp/fio-testing/data

 fio random-read-test.fio

 fio random-read-test-aio.fio

=== random-read-test.fio =======

[random-read]

rw=randread

size=128m

directory=/tmp/fio-testing/data

=====random-read-test-aio.fio===

[random-read]

rw=randread

size=128m

directory=/tmp/fio-testing/data

ioengine=libaio

iodepth=8

direct=1

invalidate=1

5, test

 fio random-read-test.fio

[root@localhost mcafee]# fio random-read-test.fio

random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=sync, iodepth=1

Starting 1 process

random-read: Laying out IO file(s) (1 file(s) / 128MB)

Jobs: 1 (f=1): [r] [100.0% done] [1,588K/0K /s] [387/0 iops] [eta 00m:00s]

random-read: (groupid=0, jobs=1): err= 0: pid=8230

  read : io=128MB, bw=1,143KB/s, iops=285, runt=114704msec

    clat (usec): min=184, max=54,583, avg=3491.60, stdev=2170.71

    bw (KB/s) : min=  760, max= 1612, per=100.09%, avg=1143.00, stdev=80.09

  cpu          : usr=0.03%, sys=1.75%, ctx=32778, majf=0, minf=32

  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%

     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued r/w: total=32768/0, short=0/0

     lat (usec): 250=3.67%, 500=8.09%, 750=0.87%, 1000=2.25%

     lat (msec): 2=13.63%, 4=28.85%, 10=42.39%, 20=0.19%, 50=0.05%

     lat (msec): 100=0.01%

Run status group 0 (all jobs):

   READ: io=128MB, aggrb=1,142KB/s, minb=1,170KB/s, maxb=1,170KB/s, mint=114704msec, maxt=114704msec

Disk stats (read/write):

  dm-0: ios=32743/2373, merge=0/0, ticks=112699/206517, in_queue=319223, util=98.62%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%

    sda: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%

[root@localhost mcafee]# fio random-read-test

random-read-test-aio.fio  random-read-test.fio

[root@localhost mcafee]# fio random-read-test-aio.fio

random-read: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=8

Starting 1 process

Jobs: 1 (f=1): [r] [100.0% done] [5,801K/0K /s] [1K/0 iops] [eta 00m:00s]

random-read: (groupid=0, jobs=1): err= 0: pid=8237

  read : io=128MB, bw=5,357KB/s, iops=1,339, runt= 24467msec

    slat (usec): min=8, max=39,678, avg=18.37, stdev=295.99

    clat (usec): min=5, max=74,765, avg=5943.53, stdev=5904.37

    bw (KB/s) : min= 4392, max= 5992, per=99.88%, avg=5350.44, stdev=364.84

  cpu          : usr=0.04%, sys=7.98%, ctx=30600, majf=0, minf=34

  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=100.0%, 16=0.0%, 32=0.0%, >=64=0.0%

     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     complete  : 0=0.0%, 4=100.0%, 8=0.1%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%

     issued r/w: total=32768/0, short=0/0

     lat (usec): 10=0.01%, 250=4.06%, 500=6.07%, 750=1.39%, 1000=2.27%

     lat (msec): 2=9.86%, 4=19.62%, 10=40.74%, 20=12.70%, 50=3.21%

     lat (msec): 100=0.08%

Run status group 0 (all jobs):

   READ: io=128MB, aggrb=5,357KB/s, minb=5,485KB/s, maxb=5,485KB/s, mint=24467msec, maxt=24467msec

Disk stats (read/write):

  dm-0: ios=32464/54, merge=0/0, ticks=191666/2553, in_queue=194260, util=99.75%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%

    sda: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%

install pdflib

Step 1: download pdflib lite
wget http://www.pdflib.com/binaries/PDFlib/704/PDFlib-Lite-7.0.4p4.tar.gz

Step 2: install pdflib lite

 ./configure
 make
 make install

Step 3: Pecl for PDFlib
 install:
      install dependences: phpize (php5-dev package)
      pecl install pdflib
         path to pdflib installation? :/usr/local


Step 4: php.ini
   extension=pdf.so

Step 5:
   /etc/init.d/apache2 reload