Nginx+Tomcat集群部署
为了获取更好的性能，我们常常需要将tomcat进行集群部署。下文通过nginx转发实现tomcat集群，并通过nginx-upstream-jvm-route插件保证session的粘滞。
应用场景环境：
server1 服务器上安装了 nginx + tomcat01
server2 服务器上只安装了 tomcat02
server1 IP 地址： 192.168.1.88
server2 IP 地址： 192.168.1.89
安装步骤：
1）在server1 上安装配置 nginx + nginx_upstream_jvm_route
shell $> wget -c http://sysoev.ru/nginx/nginx-*.tar.gz
shell $> svn checkout http://nginx-upstream-jvm-route.googlecode.com/svn/trunk/ nginx-upstream-jvm-route-read-only
shell $> tar zxvf nginx-*
shell $> cd nginx-*
shell $> patch -p0 < ../nginx-upstream-jvm-route-read-only/jvm_route.patch
shell $> useradd www
shell $> ./configure --user=www --group=www --prefix=/usr/local/nginx --with-http_stub_status_module --with-http_ssl_module --add-module=/root/nginx-upstream-jvm-route-read-only
shell $> make
shell $> make install
2）分别在两台机器上安装 tomcat和java
设置tomcat的server.xml，在两台服务器的tomcat的配置文件中分别找到：
<Engine name="Catalina" defaultHost="localhost" >
分别修改为：
Tomcat01:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
Tomcat02:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm2">
分别启动两个tomcat
3）设置nginx
shell $> cd /usr/local/nginx/conf
shell $> mv nginx.conf nginx.bak
shell $> vi nginx.conf
配置示例：
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user www www;
worker_processes 4;
error_log logs/nginx_error.log crit;
pid /usr/local/nginx/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 51200;
events
{
use epoll;
worker_connections 2048;
}
http
{
upstream backend {
server 192.168.1.88:8080 srun_id=jvm1;
server 192.168.1.89:8080 srun_id=jvm2;
jvm_route $cookie_JSESSIONID|sessionid reverse;
}
include mime.types;
default_type application/octet
-stream
;
#charset gb2312;
charset UTF-8;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 20m;
limit_rate 1024k;
sendfile on;
tcp_nopush on;
keepalive_timeout 60;
tcp_nodelay on;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
fastcgi_buffer_size 64k;
fastcgi_buffers 4 64k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;
gzip 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;
gzip_vary on;
#limit_zone crawler $binary_remote_addr 10m;
server
{
listen 80;
server_name 192.168.1.88;
ssi on;
ssi_silent_errors on;
ssi_types text/shtml;
index index.html index.htm index.jsp;
root /var/www;
#location ~ .*\.jsp$
location /app/
{
proxy_pass http://backend;
proxy_redirect off;
proxy_set_header X
-Forwarded
-For
$proxy_add_x_forwarded_for;
proxy_set_header X
-Real
-IP
$remote_addr;
proxy_set_header Host $http_host;
}
location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
{
expires 30d;
}
location ~ .*\.(js|css)?$
{
expires 1h;
}
location /Nginxstatus {
stub_status on;
access_log off;
}
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 off;
}
}
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4）测试
运行 nginx -t 测试配置的正确性，
可将服务器注释一个，实现服务的热部署，
server 192.168.2.88:8080 srun_id=jvm1;
server 192.168.2.89:8080 srun_id=jvm2;
运行 nginx -s reload 实现热部署。