linux install and configure pound reverse proxy for apache http _ https web server.pdf

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Linux FAQ / Howtos

Linux install and configure pound reverse proxy for Apache http / https web

server

by nixCrafton December 11, 2007 22 comments LAST UPDATED December 13, 2007

inApache, CentOS, Debian / Ubuntu

Q.How do I install and configure pound reverse proxy for Apache web sever under Debian Linux?

A. Pound is a reverse-proxy load balancing server. It accepts requests from HTTP / HTTPS clients and distributes them to one or more Web servers. The HTTPS requests are

decrypted and passed to the back-ends as plain HTTP. It will act as:

a) Server load balancer

b) Reverse proxy server

c) Apache reverse proxy etc

d) It can detects when a backend server fails or recovers, and bases its load balancing decisions on this information: if a backend server fails, it will not receive requests until it

recovers

e) It can decrypts https requests to http ones

f) Rejects incorrect requests

h) It can be used in a chroot environment (security feature)

If more than one back-end server is defined, Pound chooses one of them randomly, based on defined priorities. By default, Pound keeps track of associations between clients and

back-end servers (sessions).

Install Pound SoftwareType the following command to install pound:

$ sudo apt-get install pound

If you are using RHEL / CentOS, grab pound rpm here and type the command:

# rpm -ivh pound*

If you are using FreeBSD, enter:

# cd /usr/ports/www/pound/ && make install clean

How it works?

Let us assume your public IP address 202.54.1.5.

Pound will run on 202.54.1.5 port 80

It will forward all incoming http requests to internal host 192.168.1.5 and 192.168.1.10 port 80 or 443

Pound keeps track of associations between clients and back-end servers
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Pound configuration file

Under Debian / Ubuntu default file located at /etc/pound/pound.cfg

Under FreeBSD it is located at /usr/local/etc/pound.cfg(you need to create this file)

Under RHEL / CentOS you need to create file at /etc/pound.cfg

Sample configuration: HTTP Proxy

Forward all incoming request at 202.54.1.5 port 80 request to 192.168.1.5 Apache server running at 8080 port:

Open /etc/pound/pound.cfg file:

# vi /etc/pound/pound.cfg

To translate HTTP requests to a local internal HTTP server, enter (make sure 192.168.1.5 Apache running listing on port 8080):

ListenHTTP

Address 202.54.1.5

Port 80

Service

BackEnd

Address 192.168.1.5

Port 8080

End

End

End

Save and close the file. Restart pound:

# /etc/init.d/pound restart

Following example will distribute the all HTTP/HTTPS requests to two Web servers:

ListenHTTP Address 202.54.1.5

Port 80

End

ListenHTTPS

Address 202.54.1.5

Port 443

Cert "/etc/ssl/local.server.pem"

End

Service

BackEnd

Address 192.168.1.5

Port 80

End

BackEnd

Address 192.168.1.6

Port 80

End

End

For testing purpose you may generate self signed ssl certificate (/etc/ssl/local.server.pem), by entering the following command:

# cd /etc/ssl && openssl req -x509 -newkey rsa:1024 -keyout local.server.pem -out local.server.pem -days 365 -nodes

Pound log file

By default pound log message using syslog:

# tail -f /var/log/messages

# grep pound /var/log/messages

Sample complete configuration file

## Minimal sample pound.cfg

######################################################################

## global options:

User "www-data"

Group "www-data"#RootJail "/chroot/pound"

## Logging: (goes to syslog by default)

## 0 no logging

## 1 normal

## 2 extended

## 3 Apache-style (common log format)

LogLevel 1

## check backend every X secs:

Alive 30

## use hardware-accelleration card supported by openssl(1):

#SSLEngine ""

######################################################################

## listen, redirect and ... to:

# Here is a more complex example: assume your static images (GIF/JPEG) are to be served from a single back-end 192.168.0.10. In

# addition, 192.168.0.11 is to do the hosting for www.myserver.com with URL-based sessions, and 192.168.0.20 (a 1GHz PIII)

# 192.168.0.21 (800Mhz Duron) are for all other requests (cookie-based sessions). The logging will be done by the back-end serve

# The configuration file may look like this:

# Main listening ports


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ListenHTTP

Address 202.54.1.10

Port 80

Client 10

End

ListenHTTPS

Address 202.54.1.10

Port 443

Cert "/etc/pound/pound.pem"

Client 20

End

# Image server

Service

URL ".*.(jpg|gif)"

BackEnd

Address 192.168.1.10 Port 80

End

End

# Virtual host www.myserver.com

Service

URL ".*sessid=.*"

HeadRequire "Host:.*www.nixcraft.com.*"

BackEnd

Address 192.168.1.11

Port 80

End

Session

Type PARM

ID "sessid"

TTL 120

End

End

# Everybody else

Service BackEnd

Address 192.168.1.20

Port 80

Priority 5

End

BackEnd

Address 192.168.1.21

Port 80

Priority 4

End

Session

Type COOKIE

ID "userid"

TTL 180

End

End

Suggested readings:=> Pound project

=> Man pages : pound and poundctl

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{ 22 comments read them below or add one}

1`ariel December 11, 2007 at 1:38 pm

Nice !!! a few weeks ago i was googling for something like this for hours !!!

Reply

2nixCraftDecember 11, 2007 at 1:45 pm

Pound is simple and very nice. Many large site such as wordpress.com uses pound.

Reply

3Calomel December 12, 2007 at 4:35 pm

I would highly suggest pound or lighttpd as a reverse proxy. As of version 2.4e, Pound is extremely fast and stable. Lighttpd did have some problems in the past and most of

those have been fixed. Memeory managment has been greatly improved. I have to agree about the documentation, but there are examples like the following to help everyone

out:

Pound Reverse Proxy how to

http://calomel.org/pound.html

Light webserver how to

http://calomel.org/lighttpd.html

Reply

4nixCraftDecember 12, 2007 at 5:06 pm

Calomel,

Thanks for sharing your links. You got some pretty good stuff :)

Reply

5Babar December 14, 2007 at 3:48 pm

I am having the same thing using squid as reverse proxy. Seems to be doing pretty well for the time being.

Reply

6Erik December 15, 2007 at 2:48 am

To bad it doesnt do caching. Also crossraods is a good LB as-well.

Reply

7ajay December 31, 2007 at 7:37 am

i have a linux system white box loaded. tell me how to configure its lan card for internet connection while server proxy address= 192.168.10.1

port : 6080

Reply

8McKeder April 16, 2008 at 2:59 pm

I am extremely happy to have a tutorial like this. Until Recently, I had no idea what a Reverse Proxy was and this really helped me to understand it.

Thanks! and keep up all the great work!

Reply

9shashank August 10, 2008 at 8:01 pm

HI Folks,

I have a deadline and the time is ticking. i am setting up pound as a reverser proxy for a site that runs on port 8080. I m trying to run pound on 80 and direct all the traffic to

port 8080. i have pound up and running and the redirect happens fine just that when it redirects it gives me this error

The service is not available. Please try again later

i believe i need to add some directive under the pound.cfg fine but not sure what. this is what i have for pound.cfg

User "pound"

Group "pound"

LogFacility daemon

LogLevel 4

Alive 30

Client 10
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TimeOut 10

Grace 10

ListenHTTP

Address 0.0.0.0

CheckURL "(^\/|\.html|\.css|\.jpg|favicon\.ico|robots\.txt|\.png)$"

HeadRemove "X-Forwarded-For"

MaxRequest 1024

Port 80

xHTTP 0

# Err414 "/var/www/htdocs/error/generic_error_page"




Service

URL ".*sessid=.*"

HeadRequire "Host:.*web249.solutionset.com.*" BackEnd

Address 127.0.0.1

Port 8080

End

Emergency

Address 127.0.0.1

Port 8888

End

End

End

i am very new to pound so any help would be really appreciated. Thank you

Reply

10Techi November 14, 2008 at 3:34 pm

Guys,

First I must say thank you for making reverse proxy so easy to configure and making techs life easy. I am running Pound 2.4.3 on RHEL5 server. I have three websites each

running on separate webserver in internal network. I would like to reverse proxy them via one Pound server in DMZ. All three websites require secure connections for client

and I like to install the certificates on the pound server for them. I have assigned three IPs on the pound server, one for each website. But these sites are not working. Below is

my configuration.

ListenHTTP

Address 202.168.1.1

Port 80

Service

Redirect "https://www.abc.com"

End

End

ListenHTTPS

Address 202.168.1.1

Port 443

Cert "/usr/local/openssl/local.server.pem"

End Service

BackEnd

Address 172.17.1.1

Port 80

End

End

ListenHTTP

Address 202.168.2.2

Port 80

Service

Redirect "https://www.def.com"

End

End

ListenHTTPS

Address 202.168.2.2

Port 443

Cert "/usr/local/openssl/local1.server.pem"

End

Service BackEnd

Address 172.17.2.2

Port 80

End

End

ListenHTTP

Address 202.168.3.3

Port 80

Service

Redirect "https://www.ghi.com"

End

End

ListenHTTPS

Address 202.168.3.3

Port 443

Cert "/usr/local/openssl/local2.server.pem"

End

Service
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BackEnd

Address 172.17.3.3

Port 80

End

End

I am redirecting HTTP requests to HTTPS as I would only like to serve clients on secure channel. This works fine if I run each website on a separate pound server but I like t

have them on one reverse proxy server. I will really appreciate if you can provide me any help in this regard. If it is not possible with this configuration is there any way to

achieve this on a single pound server.

Thanks,

Farhan

Reply

11sameera December 1, 2008 at 6:49 am

Thanks Vivek

Finally i found a resource which is working

thankx again

Reply

12Kunal May 5, 2009 at 4:29 am

How to run pound in HA mode, and running it parallel so that both the servers can share session (In case if one is down) and how to maintain the sticky session in pound.

Thanks in Advance

Kunal

Reply

13Nishad September 10, 2009 at 4:12 pm

I am beating around the bush for more than 4 days. I am a newbie for Linux. My management given me the deadline for setting Pound. If anybody please please help me out.

installed as listed. I installed CentOS 5 and installed Pound. Well its not forwarding the requests to the internal webservers. Kindly give the instructions.

Reply

14mark September 18, 2009 at 10:16 am

we cannot seem to edit our pound.cfg file

its none wrieable and we cannot chmode it either

does anyone have any ideas how we can make this file writable ?

Reply

15mair October 13, 2009 at 7:35 pm

its really easy to configure i want to track the call record and email record as per proxy server can any body sugggest me the way? [email protected]

Reply

16amit August 4, 2010 at 6:08 am

Why not to use apache http server as reverse proxy itself?

Reply

17Clyde August 25, 2010 at 12:32 am

Hi,

How about the gateway of the back-end servers, do I point it to the Pound as gateway and configure Pound as transparent

Reply

18carl October 31, 2010 at 3:14 am

So can data on any port be sent to the BackEnd? And how would it be setup? Would it be done like this for other ports?

Service

HeadRequire Host:.*domain.com.*

BackEnd

Address 192.168.1.201

Port 80
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Port 1812

Port 1813

End

Reply

19carl October 31, 2010 at 3:29 am

or would it be in the Listen group also?:

ListenHTTP

Address 192.168.1.150

Port 80

Port 1812

Port 1813

End

Reply

20Sri March 21, 2011 at 7:03 am

Hi,

This is an Excellent Website..

I searched a lot about this topic, and found today!!!

Can any one please clarify my doubt?

Does pound supports dynamic configuration reload like

NGINX ?(Restarting master process alone will reload the configuration file)

I am required to do this.

Thanks in advance,

Sri

Reply

21Danny C April 14, 2011 at 9:35 am

I am new to reverse proxy using Pound, I would like to know how the Client Http request & response data flow in a scenarios as below:

# Let assume our Server public ip is 202.54.1.5.

# Pound will run on 202.54.1.5 port 80 . Let us call this Pound Server.

# A Http-Request-A from a Client (Internet Browser) came into the Pound Server

# Pound Server will forward the Http-Request-A to list of internal Hosts eg. 192.168.1.11, 192.168.1.12, . all on port 80. Let say, it pick the Host-192.168.1.11

# After the Host-192.168.1.11 process it, how does the Http-Response -A flow back to that Client (Internet Browser) ?

Does it flow back DIRECTLY to that Client without going through the Pound Server ?

OR

Does it flow back first to the Pound Server and then to that Client ?

I just want to investigate if there is some network bandwidth toll (incoming & outgoing) at the Pound Server which is used as a load balancer in a Cloud environment since

Cloud eg.Amazon or Azure charge for incoming as well as outgoing data transfer. All I want is just the load balancing features using Pound Server inside a high availability

nature of the Cloud.

Anyone, pls help. Thank a lot in advance .

Reply

22Gene August 28, 2012 at 9:59 pm

HI,

We are currently using apache as proxy server and redirecting all request innto our webserver. The problem we have is that our webserver only sees the internal IP address of

the apache proxy server. We would like to see the original IP address of the incoming request. Is this possible with POUND?

Reply

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linux install and configure pound reverse proxy for apache http _ https web server.pdf

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