Categories
Server

Does CSF Firewall Make Your WHM / Server Slow ?

There are various reasons why CSF firewall may make your WHM / server slow.
Here are some personal tips from me.

Categories
Server

Find String in Files in Linux

To find some string within files in Linux, you can use this command

grep -rnw '/your/path/' -e "find this string"

-r means recursive
-n means line number
-w means match the whole word 🙂

Categories
Server

Use DKIM Key With WHM, cPanel, Cloudflare

DKIM is one of useful thing to make email which is sent by your domain to be avoided marked as spam.

When you use cloudflare for that domain, there is some change that you need to do on the DKIM key.

For example on your WHM (Edit DNS Zone) or cPanel (Email > Authentication), you will get DKIM key with format like this :

"v=DKIM1; k=rsa; p=XXXX" YYY\;
Categories
Server

How to Append Date and Time to Log File in Linux

If we want to get detailed log report, we can store multiple log files with date and time information on the file name 🙂

We can do this command in Linux :

your_command_here > /path_1/path_2/your_log_$(date +"%Y-%m-%d_%H-%M-%S").txt
Categories
Server

How to Delete Files in Directory in Linux

If you want to delete files within a directory in Linux, you can use this simple command

rm -f /your/directory/*

If you want to delete files and directories recursively within a directory in Linux, you can use this command instead 🙂

rm -rf /your/directory/*
Categories
Server

Empty a File Using Linux Command

Today i received an e-mail notification from cpanel that a partition in my server is almost full.
First i checked largest directories / files using this command :

du -h --max-depth=1 /some/path

Then i noticed that they were some log files which took space in my partition 🙂

Categories
Server

How to Remove Directory and Subdirectories Recursively in Linux

Sometimes there is occasion where deleting files from Cpanel takes a very long time to finish.
For example because there are too many files under a directory.
In this situation we can use SSH to delete a directory and all files and subdirectories under that directory.

We can use the command below.
But be careful, do not enter wrong path.
You may delete the wrong directory. 🙂

rm -rf /your/directory/
Categories
Database Server

Regularly Runs MySQL FLUSH QUERY CACHE

In some situation, like suggested in some mysql optimization script, you may want to regularly run “FLUSH QUERY CACHE”.

First, open your terminal and try to run this command :

mysql -e 'FLUSH QUERY CACHE'

If there is no error, you can add that command in your cron job, such as this command to run it every 10 minutes :

*/10 * * * * mysql -e 'FLUSH QUERY CACHE'
Categories
Server

How to Create and Extract Tar.gz File in Linux

How to create tar.gz in Linux :

tar -zcvf "archive.tar.gz" "file.sql"
tar -zcvf "archive.tar.gz" "/home/example/public_html/"

How to extract tar.gz in Linux :

tar -zxvf "archive.tar.gz"
Categories
Server

How to Install PECL Memcache in WHM / CentOS

You can run these commands to install PECL memcache (not memcached).
However, this memcache will work with memcached.

wget http://pecl.php.net/get/memcache-3.0.8.tgz
tar xvfz memcache-3.0.8.tgz
cd memcache-3.0.8
phpize
./configure
make
make install

Take note of the php extensions directory that memcache is installed in.
Mine is: /usr/local/lib/php/extensions/no-debug-non-zts-20020429/

Then add this line to your php.ini

extension="/usr/local/lib/php/extensions/no-debug-non-zts-20020429/memcache.so"