Amazon AWS - Changing dynamically Apache Log File name based on Hostname

Change your vhost apache config as follow (the LogFormat writes correct client IPs to log):

LogFormat "\"%{X-Forwarded-For}i\" %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined_new

CustomLog "|cat >> /shared/log/apache2/`hostname`-access.log" combined_new

Mysqldump only tables with certain prefix / Mysqldump wildcards

This commans will dump the tables with prefix PREFIX:

mysql DATABASE -u USERNAME -p -e 'show tables like "PREFIX%"' | grep -v Tables_in | xargs mysqldump DATABASE -u USERNAME -p > DUMP.sql

Install ia32-libs in Debian Wheezy

Since Wheezy introduces multiarch, the ia32-libs package in now deprecated. It is now possible to install 32bit packages directly:

dpkg --add-architecture i386 # enable multi-arch
apt-get update
apt-get install libc6:i386 # install base 32bit libraries

Delete files older X days or minutes

This command deletes all files /PATH/TO/FOLDER/YOUR_FILENAME_PATTERN
those older than 45 days:

find /PATH/TO/FOLDER/ -name YOUR_FILENAME_PATTERN -type f -mtime +45  -delete

and this for deleting files older than 30 minutes:

find /PATH/TO/FOLDER/ -name YOUR_FILENAME_PATTERN -type f -mmin +30  -delete

How to free Port 80 that already used in Windows 8

Solution 1:

• Launch RegEdit

• Find HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP

• Change the value of "start" to 4 (disabled)

• Reboot your computer

Solution 2:

• Go to Device Manager, select “show hidden devices” from menu/view, go to “Non-Plug and Play Driver”/HTTP, double click it to disable it (and disable or manual some services depended on it).

• Reboot and use

Nagios PNP Warning after upgrade php to 5.3

I got these error and warnings from Nagios after I upgrade my PHP:


Deprecated: Assigning the return value of new by reference is deprecated in /usr/local/nagios/share/pnp/include/function.inc.php on line 1032

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europa/Berlin' for 'Debian/Squeeze' instead in /usr/local/nagios/share/pnp/include/function.inc.php on line 557


Deprecated: Function eregi() is deprecated in /usr/local/nagios/share/pnp/include/function.inc.php 

 To solve this problem you must edit this file: usr/local/nagios/share/pnp/include/function.inc.php

line 556: date_default_timezone_set('UTC');

line 1033: $pdf = new PDF('P', 'mm', 'A4');

line 1543: if($level == 2 && $type == "complete" && preg_match("/^NAGIOS_/",$tag)){

MySQL comparing timestamp with date

To find records older than 30 days using timestamp field:

Select from TableName where from_unixtime(tstamp) < (NOW() - INTERVAL 30 day);

Extracting the string between two patterns in a file

Supose the file contains this phrase: That is just a test for you

I need to extract the patterns between the words is and test:


 sed -e 's/.*is//' -e 's/test.*$//' /Path-To-Your-File/yourfile.txt

and the result is:

  just a

Find out MySQL Time & Zone

for global and session time zone run this query:


mysql> SELECT @@global.time_zone, @@session.time_zone;


for get current time from MySQL Server run this query:

mysql> select now() ;

Find Files By Date

If you need a specific date range, than consider using the find command.

In this example find files modified between 15 December 2012 and 16 December 2012, in /var directory:

touch --date "2012-12-15" /tmp/start
touch --date "2012-12-16" /tmp/end
find /var -type f -newer /tmp/start -not -newer /tmp/end

Forcing qmail to process the queue

Run this command:

kill -ALRM `ps ax | grep qmail-send | grep -v grep | awk '{print $1}'`

Adjusting qmail queue time / lifetime

if you want to adjust how long e-mails will spend in the qmail queue before they're bounced, simple set the queuelifetime:

# echo "86400" > /var/qmail/control/queuelifetime
# /etc/init.d/qmail restart

The above example is for 1 day (qmail needs the time length in seconds). Just take the days and multiply by 86,400 seconds to get your result.

Delete Documents From Solr Index By Query

If you simply want to delete documents from your Solr index by using the web interface, here's a code snippet that lets you do so:

http://localhost:8080/solr/update?stream.body=<delete><query>id:XXXXX</query></delete>&commit=true

This lets you delete documents where the id field matches XXXXX.
If you want to delete items that matches more than one field, just add another query:

http://localhost:8983/solr/update?stream.body=<delete><query>id:XXXXX</query><query>entitytype:YourContent</query></delete>&commit=true

If you want to delete all items in the index, just use this query:

<delete><query>*:*</query></delete>

Source: http://blog.dileno.com/archive/201106/delete-documents-from-solr-index-by-query/