Setting Up IP Address Logging in Linux OS

The configuration that includes the balancer located between the web servers cluster and the web application:

Determine the settings for the HAProxy balancer:

1. Add the string in the backend bk_bi section of the /etc/haproxy/haproxy.conf file:

backend bk_bi #Name of group of BI servers.

        ...

        http-request add-header userhostaddress %[src]

        ...

Determine the settings for the nginx balancer:

1. Comment the strings in the location directive of the balancer:

proxy_set_header X-Real-IP $remote_addr;

proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

Add the string instead of them:

proxy_set_header userhostaddress $proxy_add_x_forwarded_for;

2. On web servers in the configuration file:

• /etc/apache2/apache2.conf for Debian-based distributions.

• /etc/httpd/conf/httpd.conf for RedHat-based distributions.

• /etc/httpd2/conf/httpd2.conf for ALT Linux.

Comment the strings:

SetEnvIf REMOTE_ADDR "^(.+)$" USER_CLIENT_ADDR=$1

RequestHeader merge userhostaddress "%{USER_CLIENT_ADDR}e"

The configuration that does not include the balancer located between the web servers cluster and the web application:

On web servers in the configuration file:

• /etc/apache2/apache2.conf for Debian-based distributions.

• /etc/httpd/conf/httpd.conf for RedHat-based distributions.

• /etc/httpd2/conf/httpd2.conf for ALT Linux.

Check if the following strings are present:

SetEnvIf REMOTE_ADDR "^(.+)$" USER_CLIENT_ADDR=$1

RequestHeader merge userhostaddress "%{USER_CLIENT_ADDR}e"