load balancer HowTo - Linux / Unix Q & A from nixCraft

HowTo: Merge Apache / Lighttpd / Nginx Server Log Files

last updated May 3, 2017 in Apache, CentOS, Debian / Ubuntu, FreeBSD, Linux, Nginx, Perl, UNIX

My ecommerce site runs using a cluster of Apache web server. The cluster is behind nginx load balancer. I want to merge backend Apache web server log files for statistics purpose. How do I mere web server log files under Linux / UNIX like operating systems using cron jobs?

WordPress Install Memcached Object Cache Plugin To Speed Up Blog

last updated September 13, 2010 in PHP

How do I install memcached cache plugin under UNIX / Linux to speed up my dynamic database-driven wordpress blog by caching data and objects in RAM to reduce the number of times an external data source must be read?

nginx: Setup SSL Reverse Proxy (Load Balanced SSL Proxy)

last updated May 3, 2017 in CentOS, Debian / Ubuntu, FreeBSD, High Availability, KeepAlived, Linux, Nginx, RedHat and Friends, Suse, UNIX

A reverse proxy is a proxy server that is installed in a server network. Typically, reverse proxies are used in front of Web servers such as Apache, IIS, and Lighttpd. How do I setup nginx web server as SSL reverse proxy?

CentOS / Redhat: Install nginx As Reverse Proxy Load Balancer

last updated May 3, 2017 in CentOS, High Availability, KeepAlived, Linux, Nginx, RedHat and Friends

How do I configure nginx as failover reverse proxy load balancer in front of two Apache web servers under CentOS / RHEL 5.x?

CentOS / Redhat Linux: Install Keepalived To Provide IP Failover For Web Cluster

last updated May 3, 2017 in CentOS, High Availability, KeepAlived, Linux, Nginx, RedHat and Friends, UNIX

Keepalived provides a strong and robust health checking for LVS clusters. It implements a framework of health checking on multiple layers for server failover, and VRRPv2 stack to handle director failover. How do I install and configure Keepalived for reverse proxy server such as nginx or lighttpd?

Linux Demilitarized Zone (DMZ) Ethernet Interface Requirements and Configuration

last updated January 2, 2008 in CentOS, Debian / Ubuntu, EMail Servers, Iptables, Linux, Networking, RedHat and Friends, Suse, Ubuntu Linux

Q. Can you tell me more about Linux Demilitarized Zone and Ethernet Interface Card Requirements for typical DMZ implementation? How can a rule be set to route traffic to certain machines on a DMZ for HTTP or SMTP?

A. Demilitarized zone, used to secure an internal network from external access. You can use Linux firewall to create DMZ easily. There are many different ways to design a network with a DMZ. The basic method is to use a single Linux firewall with 3 Ethernet cards. The following simple example discusses DMZ setup and forwarding public traffic to internal servers.
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