Testing http2

http2 is the latest protocol  everyone is migrating on it due to its reliability and speed. So my client asked me the same to enable it for his server, i had to enable http2 protocol on one of my client’s dedicated server. After enabling it i faced very strange issue that took my couple of hours figuring out the main cause.

I enabled http2 and then tried to access web site with local chrome browser (Version 65.0.3325.181 (Official Build) (64-bit)) it returned http/1.1 all the time in network tab. Then i tried accessing it on my remote desktop server having windows 2012 standard version i saw all the things work fine and in network tab i saw h2 which means it is working.

So i searched on google and came to the conclusion it is either network (ISP), antivirus or firewall which is blocking the access via http2 and reverting back to http/1.1 protocol. Here are 2 URLs to check for http2 support locally and on web server.

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Switching between litespeed and apache from ssh | switch from litespeed

Today i will tell you the ssh command to switch between apache and litespeed web servers. You must have litespeed installed on the server.

This command is useful when you have apache and litespeed installed and your cPanel license is no more operational or expired. You can still swtich between web servers by executing this command via terminal/ssh.

 

Login to your server with root access via ssh terminal and run followimg ssh command:

To switch from litespeed to apache:

sh /usr/local/lsws/admin/misc/cp_switch_ws.sh apache

To switch from apache to litespeed:

sh /usr/local/lsws/admin/misc/cp_switch_ws.sh lsws

Please note you should write correct path of your litespeed installation directory.

Redirect old domain to new domain with 301

Here are the few lines of code you can add into your .htaccess to redirect your old domain to new domain with 301 (permanent redirect) code.

Open .htaccess file in any editor and add following below lines, please replace websterz.info with your own domain.

RewriteEngine On
RewriteCond %{HTTP_HOST} ^websterz.info [NC,OR]
RewriteCond %{HTTP_HOST} ^www.websterz.info [NC]
RewriteRule ^(.*)$ http://websterz.info/$1 [L,R=301,NC]

 

That’s all 🙂

Check active connections to web server – DDOS solution

Here are few commands to check the active connection to apache or to any other web server, you can block IPs having too many connections :

Login to SSH and execute following commands with root access:

1.To see what IPs are connecting to server and how many connections exist from each IP:

netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

2.To see how many connections each IP on the server is receiving:

netstat -plan |grep :80 | awk '{print $4}' | cut -d: -f1 | sort | uniq -c | sort -n

3.Get total current active connections to Apache:

netstat -apn | grep :80 | wc -l

Get Apache status update from command line to see which domain is receiving maximum hits (cPanel/WHM server):

lynx http://localhost/whm-server-status

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The mod_security plugin could not connect to the database. Please verify that MySQL is running. Error: Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2) – Solution

If you’re getting following error while accessing mod_sec from WHM, here is the quick solution for this.

The Mod Security plugin could not connect to the database. Please verify that MySQL is running. Error: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
Login to your WHM with root access.
Go to Service Manager from left menu.
See if MySQL Service is enabled and being monitored.
Check the boxes if unchecked.

Now access Mod Security from WHM. It should be working fine now.

Feedback are appreciated 🙂