LinuxWebLog.com

Here is a one liner to check for IPs of bots that are misusing your site.

This will give you the top 10 IPs and URIs with a hit count.

Consider blocking those rogue IPs with a high hit count via iptables.

Do you see garbled text, unicode keywords in your referral web stats reports like below?

Use the below url for the conversion:

Unicode keyword translation

Here is the simple php source code that uses google translate for translation to English:

I've had to do this on a couple of servers to check on the network speeds and sysctl tuning.

On the receiving end (192.168.10.1) bring up netcat listening to a port:

Use the below one liner to send over some data via netcat from 192.168.10.2 which prints out the transfer speed.

Increase the default maximum TCP buffer size and rerun the above test for proper tuning. Make sure to restart netstat listening socket upon sysctl changes.

The following are recommended:

While generating ssh keys, I usually use RSA type since it can be used to generate 2048 bits key, while DSA is restricted to exactly 1024 bits.

The below information is extracted from the smartctl man page.

To look at ATA disks behind 3ware SCSI RAID controllers:

Where N is the disk number.

Devices /dev/sda and /dev/twe0 is used with 3ware series 6000, 7000, and 8000 controllers that use the 3x-xxxx driver.

/dev/sda form is deprecated starting with the Linux 2.6 kernel.

/dev/twa0 is used with 3ware 9000 series controllers, which use the 3w-9xxx driver.

You can also check on the series with the below command:

Below will list all of the files that are used for apache authentication in /var/www/html file path:

Here is the breakdown:

Find all files named ".htaccess" at path "/var/www/html"

The search output gets piped via xargs to awk, deleting leading whitespace (spaces and tabs) from front of each line and output is of only the second field of lines containing the text "File".

Awk output is further piped through sort and uniq which results in the files being used for apache authentication.

First go into "Clients", select the corresponding client IP Addresses and assign the additional IP address.

Then go into "Domains", select the domain that should be converted to exclusive IP and modify the "Web Host Settings" and assign it the new IP.

While trying to get command-t VIM plugin installed I noticed that the default vim-7.0.x installed from CentOS Base repository does not come compiled with ruby support and needed to be upgraded to version 7.2.x:

Notice "-ruby" which states that it is without ruby support.

Once the rpmbuild environment is setup, install the source rpm:

Edit the vim.spec file, line 496 and remove perl-devel from the requirement list.

Then build rpm binary:

Install the rpms via:

Recently upgrading to java version "1.6.0_24", jps and jstat seemed to be broken to get monitoring information from running tomcat process.

By default java.io.tmpdir is /tmp, however tomcat usually uses it's own temp directory. That is where jps/jstat looks for hsperfdata_* dirs. If java.io.tmpdir is not set, it would look in /tmp. If jps can't find the hsperfdata directory, it won't report anything.

jps/jstat however allows to specify java.io.tmpdir in case you're using a JVM that places those directories in a different location.

So to get it to work:

This works for both HTTP and HTTPS where any front end web server such as nginx which handles the actual request sets a header when request comes via HTTPS. In Apache configuration you then use mod_setenvif to set the HTTPS variable, which Django then picks up to use for redirection.

With front end nginx server which handles SSL, set header "X-Forwarded-Proto=https" via:

On Apache, add directive:

The HTTPS variable is picked up as being special by mod_wsgi and it will fix the wsgi.url_scheme in WSGI environment which Django then uses for redirection.

This way you don't need to customize Django stack.