linux環境下經過nginx實現tomcat集羣

linux環境下經過nginx實現tomcat集羣

安裝nginx以前須要pcre依賴和jvm-remote補丁
1、準備以下軟件：
一、nginx-1.1.2.tar.gz，負載均衡/反向代理服務器，可經過http://nginx.org/en/download.html獲取。
二、pcre-8.10.tar.gz，正規表達式庫，可經過http://sourceforge.net/projects/pcre/獲取；
三、nginx-upstream-jvm-route-0.1.tar.gz，是一個 Nginx 的擴展模塊，用來實現基於 Cookie 的 Session Sticky 的功能，可經過http://code.google.com/p/nginx-upstream-jvm-route/downloads/list獲取；

2、安裝和安裝
一、解壓各軟件

[root@localhost ~]# tar zxvf pcre-8.10.tar.gz
[root@localhost ~]# tar zxvf nginx-upstream-jvm-route-0.1.tar.gz
[root@localhost ~]# tar nginx-1.1.2.tar.gz

二、安裝

[root@localhost ~]# cd nginx-1.1.2
[root@localhost ~]# patch -p0 < ${nginx-upstream-jvm-route解壓目錄}/jvm_route.patch
[root@localhost ~]# ./configure --prefix=/usr/local/nginx --with-pcre=${pcre解壓目錄} --with-http_stub_status_module --with-http_ssl_module --add-module=${nginx-upstream-jvm-route解壓目錄}
[root@localhost ~]# make
[root@localhost ~]# make install

3、修改配置
一、修改tomcat的server.xml，服務器的tomcat的配置文件中分別找到：
<Engine name="Catalina" defaultHost="localhost" >
分別修改成：

Tomcat01:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="a">
Tomcat02:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="b">
Tomcat03:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="c">

二、修改nginx的nginx.conf文件

#運行NGINX所使用的用戶和組
user  root;
#nginx進程數，建議按照cpu數目來指定，通常爲它的倍數，每一個進程消耗約10M內存
worker_processes  1;

#日誌信息
error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

pid        logs/nginx.pid;

events {
    #使用epoll的I/O模型
    use epoll;
    #該值受系統進程最大打開文件數限制，須要使用命令ulimit -n 查看當前設置
    worker_connections  1024;
}


http {
    #這裏是您須要修改的地方，修改成您的服務器IP:端口號 srun_id爲您在tomcat中所配置的jvmRoute
    upstream backend{
      server 192.168.12.128:18080 srun_id=a;
      server 192.168.12.128:28080 srun_id=b;
      server 192.168.12.128:38080 srun_id=c;
      jvm_route $cookie_JSESSIONID|sessionid reverse;
    }
    include       mime.types;
    #設置默認類型是二進制流，若未設置時，好比未加載PHP時，是不予解析，用瀏覽器訪問則出現下載窗口
    default_type application/octet-stream;
    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  192.168.12.128; #這裏也是您所須要修改的地方，多域名用空格隔開
        index index.html index.htm index.jsp;
        charset UTF-8;
        root /usr/local/tomcats/project/;# 這裏也是您所須要修改的地方，虛擬機指向的路徑（可能這裏有點問題），個人web應用系統放在project下面的
        #access_log  logs/host.access.log  main;
        
        #這裏也是您所須要修改的地方，yourproject更換成您的項目路徑
        location /yourproject/ {
            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 $http_host;
            index  index.html index.htm index.jsp;
        }
        location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$ {
            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';

        error_page  404              /404.html;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

三、檢查nginx的配置

[root@localhost ~]# /usr/local/nginx/sbin/nginx -t -c /usr/local/nginx/conf/nginx.conf

4、啓動測試

/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
/usr/local/tomcats/tomcat-a/bin/startup.sh
/usr/local/tomcats/tomcat-b/bin/startup.sh
/usr/local/tomcats/tomcat-c/bin/startup.sh

中止服務

/usr/local/tomcats/tomcat-a/bin/shutdown.sh
/usr/local/tomcats/tomcat-b/bin/shutdown.sh
/usr/local/tomcats/tomcat-c/bin/shutdown.sh
pkill -9 nginx