CentOS 6.5系统下Nginx反向代理实现Tomcat负载均衡

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CentOS 6.5 系统下 Nginx 反向代理实现 Tomcat 负载均衡

1. 查看当前系统的内核和系统参数以及版本。

[root@node1 ~]# uname -a
Linux node1 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
[root@node1 ~]# cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m

2. 安装 nginx。
1）安装 gcc 编译器及相关工具和依赖库。
[root@node1 ~]# yum -y install gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5 krb5-devel libidn libidn-devel openssl openssl-devel openldap openldap-devel nss_ldap openldap-clients openldap-servers pcre

2）编译安装 pcre 库。
PCRE(Perl Compatible Regular Expressions) 是一个 Perl 库，包括 perl 兼容的正规表达式。Pcre 的作用主要是使 nginx 支持 HTTP rewrite 模块。
创建一个指定放置压缩包的目录。
[root@node1 ~]# mkdir -p /linuxidc/tools
[root@node1 ~]# cd /linuxidc/tools/
[root@node1 tools]# tar -zxf pcre-8.33.tar.gz
[root@node1 pcre-8.33]# ./configure
[root@node1 pcre-8.33]# make && make install
[root@node1 nginx-1.5.8]# ./configure –with-http_stub_status_module –with-http_ssl_module –prefix=/data/nginx
[root@node1 nginx-1.5.8]# make && make install

注意：安装成功启动 nginx，有可能会遇到下面错误，
[root@node1 nginx-1.5.8]# /data/nginx/sbin/nginx -t
/data/nginx/sbin/nginx: error while loading shared libraries: libpcre.so.1: cannot open shared object file: No such file or directory

解决办法：
[root@node1 ~]# cd /lib64/
[root@node1 lib64]# ln -s libpcre.so.0.0.1 libpcre.so.1

3）此事再启动 nginx，查看下进程和端口。
[root@node1 lib64]# /data/nginx/sbin/nginx -t
nginx: the configuration file /data/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /data/nginx/conf/nginx.conf test is successful
[root@node1 lib64]# /data/nginx/sbin/nginx
[root@node1 lib64]# ps -ef | grep nginx
root 8991 1 0 16:43 ? 00:00:00 nginx: master process /data/nginx/sbin/nginx
nobody 8992 8991 0 16:43 ? 00:00:00 nginx: worker process
root 8994 1907 0 16:44 pts/1 00:00:00 grep nginx
[root@node1 lib64]# netstat -anpt | grep nginx
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 8991/nginx

3. 配置 nginx web 反向代理，实现两个 tomcat 负载均衡：
nginx 配置文件如下：
[root@node1 ~]# cat /data/nginx/conf/nginx.conf
user root;
worker_processes 1;
#error_log logs/error.log info;
pid /data/nginx/logs/nginx.pid;
worker_rlimit_nofile 65535;
events {
use epoll;
worker_connections 65535;
multi_accept on;
}

http {
include mime.types;
default_type application/octet-stream;
charset utf-8;
log_format main ‘$remote_addr – $remote_user [$time_local] “$request” ‘
‘$status $body_bytes_sent “$http_referer” ‘
‘”$http_user_agent” “$http_x_forwarded_for”‘;

access_log logs/access.log main;

sendfile on;
tcp_nopush on;
keepalive_timeout 60;
server_tokens off;
limit_rate_after 3m;
limit_rate 512k;
tcp_nodelay on;
client_header_buffer_size 256k;
large_client_header_buffers 4 256k;

# Define nginx proxy module
proxy_http_version 1.1;
proxy_connect_timeout 60;
proxy_read_timeout 60;
proxy_send_timeout 60;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
proxy_headers_hash_max_size 51200;
proxy_headers_hash_bucket_size 6400;

# Define Gzip compression module
gzip on;
gzip_vary on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.0;
gzip_comp_level 2;
gzip_types text/plain application/x-Javascript text/css application/xml;

# Define realserver pool
upstream linuxidc.com {
ip_hash;
server 192.168.1.15:8080 max_fails=0 weight=5;
server 192.168.1.19:8080 max_fails=0 weight=5;
}

server {
listen 80;
server_name linuxidc.net www.linuxidc.net;

location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://linuxidc.com;
expires 1d;
access_log logs/host.access.log main;
}

# Define 404 502 503 504 error page
error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
}
}