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Web Server Protection Against Exploits with mod_security |
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Sunday, 05 February 2012 |
If you have problems with exploits to your web server apps (php apps for example, like phpMyAdmin, rouncube, PHPBB) then there is a sollution to those problems. An usefull tool for protecting your web server against such exploits or against spam is mod_security, a module for Apache web server.
So install on your system tje following module Apache:
mod_security
You must install on your server Apache, mod_security module and then you must configure both.
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Last Updated ( Sunday, 05 February 2012 )
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Protect an Apache Web Server Against Spiders DDoS |
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Wednesday, 07 December 2011 |
To protect an Apache Web Server against spiders DDoS or HTTP brute force attacks by limiting number of HTTP POSTs per second use the following Apache module:
mod_evasive
You must install it on your Apache Web server and then configure it.
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Last Updated ( Sunday, 05 February 2012 )
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Copy Files in Linux Preserving Hard Links |
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Monday, 17 October 2011 |
Let's say you want to move data from a partition to another, preserving hard links, for backup purpose. There's an easy way to do that with rsync -H option:
rsync -avH /var/ /mnt/hdd_packup/ |
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Benchmark a hard drive in Linux |
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Friday, 14 October 2011 |
To benchmark a hard drive in linux we will use hdparm utility:
hdparm -tT /dev/sda
Replace /dev/sda with your drive name. You can use this command with RAID arrays too:
hdparm -tT /dev/md0
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Last Updated ( Friday, 14 October 2011 )
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Execute a program periodialy and see changes in output of the program |
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Friday, 14 October 2011 |
Let's say we want to see changes from a file by executing cat periodicaly on our terminal.
In order to do that we use watch command:
watch cat /proc/stat
This command will read /proc/stat file at every 2 seconds and will refresh/redisplay the content of /proc/stat file.
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Install htop on CentOS Linux |
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Friday, 14 October 2011 |
We will download htop rpm package from
http://pkgs.repoforge.org/htop/
and we will install it:
wget http://pkgs.repoforge.org/htop/htop-0.9-1.el6.rf.x86_64.rpm
rpm -i htop-0.9-1.el6.rf.x86_64.rpm
If your version is 32 bit, use 32 bit package instead.
In order to install any rpm package, the rpm package must be installed first (if you know what I mean). If you do not have rpm installed, use:
yum install rpm |
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Last Updated ( Friday, 14 October 2011 )
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Kate Quick Tips |
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Wednesday, 17 August 2011 |
Here are some usefull Kate editor quick tips:
F11 toggle on/of line numbers.
Ctrl+G go to line number (you must input line number).
Ctrl+K delete entire line.
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Today Quick Tip: Created Files or Directories With a Particular Read-Write Permission |
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Saturday, 30 April 2011 |
If we want for example to create some files or directories from command line and all of them to have Owner Read, Write and Execute permisions, Read and Write permisions for group and no permissions for others we will use umask command. After that command all files or directories created will have Owner= RWX, Group=RW, Other= no rights.
umask 017
or:
umask u=rwx,g=rw,o=
To use proper permissions see the next table:
umask permissions 0 - read, write, execute 1 - read, write 2 - read, execute 3 - read 4 - write, execute 5 - write 6 - execute only 7 - no rights |
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Last Updated ( Saturday, 30 April 2011 )
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Today Quick Tip: Identify your Linux Distribution |
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Tuesday, 19 April 2011 |
To identify your linux distribution on an already installed server run a ls command:
ls -d /etc/*release /etc/*version
If any file is found you can display it with cat:
cat /etc/redhat-release
If you think you are on debian run:
cat /etc/debian_version
You can also try:
cat /proc/version
cat /etc/issue
cat /etc/issue.net
cat /etc/motd
lsb_release -a
cat /etc/[A-Za-z]*[_-][rv]e[lr]*
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Last Updated ( Tuesday, 19 April 2011 )
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Today Quick Tip: Start a service in Ubuntu |
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Wednesday, 06 April 2011 |
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To start for example mysql server we will use service command:
service mysql start
The old way of starting a service was: /etc/init.d/mysql start
(but is becoming obsolete).
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Today Quick Tip: Change Keyboard Settings/mapping in Debian Linux |
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Friday, 18 March 2011 |
To change keyboard settings / mapping in Debian Linux use dpkg-reconfigure app:
dpkg-reconfigure console-data
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Last Updated ( Friday, 18 March 2011 )
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