I try to use Nginx as a reverse proxy to see if there is any improvement over Apache Worker MPM or not. I found an instruction from DirectAdmin webboard but it’s quite old. So, I just tried to follow their steps and do some modification to match what I have read. Below is what I did

1. You need to compile Nginx. Nginx version 0.8.54 is the lastest stable release as of today. So, just copy and paste below code into your SSH
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All steps below should be done with a new clean install of DirectAdmin. It is possible to make it work on the server that already have users on it. I did that and it works perfectly fine. However, the steps will be a bit different and it won’t work if you just follow instruction below.

1. Copy and paste below command into your SSH
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I’d like to skip first two or three fields at the the beginning of a line and print the rest of line. Consider the following input:

This is a test
Giving back more than we take

I want my input file with the following output:

a test
more than we take

How do I printing lines from the nth field using awk under UNIX or Linux operating systems?
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ow can I find all the file descriptors used by a process such as httpd (Apache web server) or mysqld (MySQL Database server)?

You can use /proc file system or the lsof command to find all the file descriptors used by a process.
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root@xxxxxx:~# sysctl -p /etc/sysctl.conf
got an error:

error: “net.bridge.bridge-nf-call-iptables” is an unknown key
error: “net.bridge.bridge-nf-call-arptables” is an unknown key

Fix:

sudo modprobe bridge