Load balancing with nginx

I. Preparation: Nginx load server: Centos6.2IP: 192.168.1.93WEB server: Web1: 192.168.1.155Web2: 192.168.1.205 purpose: When a user accesses 192.168.1.93, load to WEB1 and WEB2 through Nginx ============

I. preparation:

Nginx load server:

Centos 1, 6.2

IP: 192.168.1.93

WEB server:

Web1: 192.168.1.155

Web2: 192.168.1.205

Objective: to load to WEB1 and WEB2 through Nginx when users access 192.168.1.93

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II. configure the Nginx server load balancer

Configure the environment of WEB1 and WEB2 and upload the program. Make sure the data of the two servers is consistent!

1.1 disable Selinux

# Vi/etc/selinux/config

# SELINUX = enforcing change to disabled

#: Wq

# Shutdown-r now

2.2 File storage:

Software source code storage location:/usr/local/src

Remote compilation and installation location:/usr/local/software name

2.3 download the software package

Download nginx (Current stable version)

Http://nginx.org/download/nginx-1.0.15.tar.gz

Download pcre

Ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.30.tar.gz

Download ngx_cache_purge (clear the specified URL cache for future expansion and configuration of nginx cache server)

Http://labs.frickle.com/files/ngx_cache_purge-1.5.tar.gz

2.4 install and compile the Tool Library

# Yum install-y make apr * autoconf automake curl-devel gcc-c ++
Zlib-devel openssl-devel pcre-devel gd kernel keyutils patch perl
Kernel-headers compat * cpp glibc libgomp libstdc ++-devel
Keyutils-libs-devel libsepol-devel libselinux-develkrb5-devel
Zlib-devel libXpm * freetype libjpeg * libpng * php-common php-gd ncurses *
Libtool * libxml2 libxml2-devel patch

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III. Installation

# Groupadd www # Add a www Group

# Useradd-g www-s/bin/false # Create an nginx running account www and add it to www, www users are not allowed to log on to the system cd/usr/local/src # to enter the installation directory.

# Tar zxvf ngx_cache_purge-1.5.tar.gz # extract

# Tar zxvf nginx-1.0.15.tar.gz # extract

# Tar zxvf pcre-8.30.tar.gz # extract
# Cd nginx-1.0.15

#./Configure? Prefix =/usr/local/nginx? Without-http_memcached_module
? User = www? User = www? Group = www? With-http_stub_status_module
? With-openssl =/usr/
? With-pcre =/usr/local/src/pcre-8.30? Add-module = ../ngx_cache_purge-1.5 # configuration
Note :? With-pcre =/usr/local/src/pcre-8.30 points to the source package decompression path, while
It is not the installation path. Otherwise, an error is reported.
# Make # compile
# Make install # install
#/Usr/local/nginx/sbin/nginx # start Nginx

Enable nginx startup
# Echo "/usr/local/nginx/sbin/nginx">/etc/rc. local

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IV. configuration

Configure Nginx

# Backing up nginx configuration files

# Cp/usr/local/nginx/conf/nginx. conf/usr/local/nginx/conf/nginx. conf. bak

4.1 Set the nginx running account

# Vi/usr/local/nginx/conf/nginx. conf # Edit
Find the user nobody; change it to user www; # on the first line
4.2 disable nginx from null host headers
# Vi/usr/local/nginx/conf/nginx. conf # Edit and find the server and add the following content in the line above:
##############################
Server {
Listen 80 default;
Server_name _;
Location /{

Root html;
Return 404;
}
Location ~ /. Ht {
Deny all;
}
}
##############################

#/Usr/local/nginx/sbin/nginx-s reload # smoothly restart the nginx service

After the configuration is completed, the access from the bear host will jump directly to the nginx404 interface.

4.3 add nginx VM inclusion files

# Cd/usr/local/nginx/conf/# enter the nginx installation directory
# Mkdir vhost # Create a virtual directory
# Vi/usr/local/nginx/conf/nginx. conf # Edit
Find the code added in the previous step and add the following content at the end: include vhost/*. conf; for example:
##############################
Server {
Listen 80 default;
Server_name _;
Location /{
Root html;
Return 404;
}
Location ~ /. Ht {
Deny all;
}
}
Include vhost/*. conf;
##############################

4.4 add a Web server list file
# Cd/usr/local/nginx/conf/# enter the Directory
# Touch vhost. conf # Create a file
# Vi/usr/local/nginx/conf/nginx. conf # Edit
Locate the code added in the previous step and add a line below
Include vhost. conf;
4.5 set nginx global parameters
Vi/usr/local/nginx/conf/nginx. conf # Edit
Worker_processes 2; # Number of worker processes, which is the number of CPU cores or twice
Events
{
Use epoll; # Add
Worker_connections 65535; # Change to 65535, the maximum number of connections.
}
############ Add and modify the following code in http ##############
Server_names_hash_bucket_size 128; # Add
Client_header_buffer_size 32 k; # increase
Large_client_header_buffers 4 32 k; # increase
Client_max_body_size 300 m; # increase
Tcp_nopush on; # Change to on
Keepalive_timeout 60; # Change to 60
Tcp_nodelay on; # Add
Server_tokens off; # Added. nginx version information is not displayed.
Gzip on; # Change to on
Gzip_min_length 1 k; # increase
Gzip_buffers 4 16 k; # increase
Gzip_http_version 1.1; # Add
Gzip_comp_level 2; # Add
Gzip_types text/plain application/x-javascript text/css
Application/xml; # Add
Gzip_vary on; # Add

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4.6 set the Web server list

# Cd/usr/local/nginx/conf/# enter the Directory
# Vi vhost. conf # edit and add the following code
Upstream osyunweihost {
Server 192.168.1.155: 80 weight = 1 max_fails = 2 fail_timeout = 30 s;
Server 192.168.1.205: 80 weight = 1 max_fails = 2 fail_timeout = 30 s;
Ip_hash;
}
4.7 create a VM configuration file

# Cd/usr/local/nginx/conf/vhost # enter the VM Directory
# Touch vhost. conf # Create a VM configuration file
# Vi vhost. conf # Edit
Server
{
Listen 80;
Server_name www.a.com bbs.a.com sns.a.com;
Location/
{
Proxy_next_upstream http_502 http_504 error timeout
Invalid_header;
Proxy_pass http: // ahost;
# Proxy_redirect off;
Proxy_set_header Host $ host;
Proxy_set_header X-Forwarded-For $ remote_addr;
}
Log_format access' $ remote_addr? $ Remote_user [$ time_local]
$ Request'
'"$ Status" $ body_bytes_sent
"$ Http_referer "'
'"$ Http_user_agent"
"$ Http_x_forwarded_for "';
Access_log/usr/local/nginx/logs/access. log access;
Location/NginxStatus {
Stub_status on;
Access_log on;
Auth_basic "NginxStatus ";
# Auth_basic_user_file pwd;
}
}
: Wq! # Save configuration
#/Usr/local/nginx/sbin/nginx-s relooad # restart nginx smoothly

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V. test

Domain name:
Www.a.com
Bbs.a.com
Sns.a.com
Resolution to 192.168.1.93
When the customer accesses these three sites, Nginx will load balancer to the Web1 and Web2 servers based on the ip_hash value accessed by the customer.

So far, Nginx server load balancer configuration is complete.