Nginx+keepalived+tomcat实现tomcat高可用性负载均衡

Redhat Linux安装keepalived实现双机热备

参考：http://www.liusuping.com/ubuntu-linux/Redhat-linux-keepalived-ha.html

Nginx+keepalived+tomcat实现tomcat高可用性负载均衡 试验环境：
CentOS5.4、pcre-8.12、nginx-upstream-jvm-route-0.1、nginx-1.0.10、apache-tomcat-7.0.23 、keepalived-1.1.17.tar.gz、jdk-7u2-linux-x64.tar.gz
主nginx服务器地址：10.29.9.200
辅nginx服务器地址：10.29.9.201
tomcat1: 10.29.9.202
tomcat2: 10.29.9.203 VIP: 10.29.9.188 拓扑如下：

1.分别在10.29.9.200和10.29.9.201上面安装nginx

tar zxf pcre-8.12.tar.gz
cd pcre-8.12
./configure
make;make install

  下载下面的插件安装，否则nginx无法识别tomcat中jvmRoute，从而无法达到session复制的效果。

wget http://friendly.sinaapp.com/LinuxSoft/nginx-upstream-jvm-route-0.1.tar.gz
tar xzf nginx-upstream-jvm-route-0.1.tar.gz
tar xzf nginx-1.0.10.tar.gz
cd nginx-1.0.10
patch -p0 <../nginx_upstream_jvm_route/jvm_route.patch
./configure --prefix=/usr/local/nginx --with-http_stub_status_module \ --with-pcre=/root/pcre-8.12 --add-module=../nginx_upstream_jvm_route/
#--with-pcre=指向的是pcre的源码包
make;make install

2.配置nginx

vim /usr/local/nginx/conf/nginx.conf
user www www; worker_processes 4; error_log /home/wwwlogs/nginx_error.log crit; pid /usr/local/nginx/logs/nginx.pid; #Specifies the value for maximumfile descriptors that can be opened by this process. worker_rlimit_nofile 51200; events                  {                       use epoll;                worker_connections 51200;         }       http        {    upstream backend {         server 10.29.9.202:8080 srun_id=tomcat1;        server 10.29.9.203:8080 srun_id=tomcat2;         jvm_route $cookie_JSESSIONID|sessionid reverse;        } include       mime.types; default_type application/octet-stream; server_names_hash_bucket_size 128; client_header_buffer_size 32k; large_client_header_buffers 4 32k; client_max_body_size 50m; 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 256k; gzip on;gzip_min_length 1k; gzip_buffers     4 16k; charset UTF-8 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 www.8090u.com;    index index.jsp index.htm index.html;   root /home/wwwroot/; location / {      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 /home/wwwlogs/access.log access;        } include vhost/*.conf; }  

3. 分别在两台nginx服务器上安装keepalived

tar zxvf keepalived-1.1.17.tar.gz

cd keepalived-1.1.17

./configure --prefix=/usr/local/keepalived

make && make install

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/

mkdir /etc/keepalived

cd /etc/keepalived/  

主keepalived配置

vim keepalived.conf

vrrp_script chk_http_port {                script "/opt/nginx_pid.sh"                 interval 2                weight 2 } vrrp_instance VI_1 {         state MASTER        interface eth0         virtual_router_id 51         mcast_src_ip 10.29.9.200         priority 150         authentication {                       auth_type PASS                      auth_pass 1111        }         track_script {                 chk_http_port        }         virtual_ipaddress {              10.29.9.188        } ｝

辅keepalived 配置 vrrp_script chk_http_port {                script "/opt/nginx_pid.sh"                 interval 2                weight 2 } vrrp_instance VI_1 {         state BACKUP        interface eth0         virtual_router_id 51         mcast_src_ip 10.29.9.201         priority 100         authentication {                     auth_type PASS                      auth_pass 1111        }         track_script {                 chk_http_port        }         virtual_ipaddress {                  10.29.9.188        } }

启动keepalived，检查虚拟IP是否邦定，在主keepalived

[root@xenvps0 ~]# /etc/init.d/keepalived start 启动

keepalived：                                          [确定]

 [root@xenvps0 ~]# ip a 1: lo: mtu 16436 qdisc noqueue    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00     inet 127.0.0.1/8 scope host lo 2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000    link/ether 00:16:36:68:a4:fc brd ff:ff:ff:ff:ff:ff     inet 10.29.9.200/24 brd 10.29.9.255 scope global eth0 inet 10.29.9.188/32 scope global eth0 在eth0上面我们已经看到虚拟IP　10.29.9.188已经邦定成功  

4.安装tomcat
1）安装tomcat_1
tar zxvf apache-tomcat-7.0.23.tar.gz
mv apache-tomcat-7.0.23 /usr/local/tomcat
2）安装tomcat_2，步骤同1）

5.分别在tomcat服务器安装jdk

 tar zxvf  jdk-7u2-linux-x64.tar.gz mv jdk1.7.0_02 /usr/local/jdk1.7.0_02
cat >>/etc/profile <export JAVA_HOME=/usr/local/jdk1.7.0_02
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH:$HOMR/bin EOF;

source /etc/profile //使环境变量立即生效 5.tomcat集群配置
tomcat1配置：
修改conf/server.xml配置文件
channelSendOptions="8">
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>

address="224.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
address="10.29.9.202" //tomcat1 所在服务器的IP地址
port="4000" //端口号
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>







filter=""/>

tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>




在…添加下面这句：   tomcat2配置：
修改conf/server.xml配置文件
channelSendOptions="8">
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>

address="224.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
address="10.29.9.203" //tomcat2所在服务器IP
port="4001" //端口号不能和tomcat1重复
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>







filter=""/>
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>


在…添加下面这句：   6.session配置修改web应用里面WEB-INF目录下的web.xml文件，加入标签

直接加在之前
开启网卡组播功能：
route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 7.创建jsp测试页面
mkdir /opt/project cd /opt/project
vi index.jsp


<%
String showMessage="Hello,This is 10.29.9.202 server";
out.print(showMessage);
%>

----------------------------
mkdir /opt/project cd /opt/project
vi index.jsp


<%
String showMessage=" Hello,This is 10.29.9.203 server";
out.print(showMessage);
%>