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.htmlNginx+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" $http_x_forwarded_for'; access_log /home/wwwlogs/access.log access; } include vhost/*.conf; }
3. 分别在两台nginx服务器上安装keepalived
tar zxvf keepalived-1.1.17.tar.gz
cd keepalived-1.1.17
./configure --prefix=/usr/local/keepalived
make && make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived
cd /etc/keepalived/
主keepalived配置
vim keepalived.conf
vrrp_script chk_http_port { script "/opt/nginx_pid.sh" interval 2 weight 2 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 mcast_src_ip 10.29.9.200 priority 150 authentication { auth_type PASS auth_pass 1111 } track_script { chk_http_port } virtual_ipaddress { 10.29.9.188 } ｝
辅keepalived 配置 vrrp_script chk_http_port { script "/opt/nginx_pid.sh" interval 2 weight 2 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 mcast_src_ip 10.29.9.201 priority 100 authentication { auth_type PASS auth_pass 1111 } track_script { chk_http_port } virtual_ipaddress { 10.29.9.188 } }
启动keepalived，检查虚拟IP是否邦定，在主keepalived
[root@xenvps0 ~]# /etc/init.d/keepalived start 启动
keepalived： [确定]
[root@xenvps0 ~]# ip a 1: lo:
4.安装tomcat
1）安装tomcat_1
tar zxvf apache-tomcat-7.0.23.tar.gz
mv apache-tomcat-7.0.23 /usr/local/tomcat
2）安装tomcat_2，步骤同1）
5.分别在tomcat服务器安装jdk
tar zxvf jdk-7u2-linux-x64.tar.gz mv jdk1.7.0_02 /usr/local/jdk1.7.0_02
cat >>/etc/profile <
export CLASSPATH=$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
notifyListenersOnReplication="true"/>
port="45564"
frequency="500"
dropTime="3000"/>
port="4000" //端口号
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
修改conf/server.xml配置文件
notifyListenersOnReplication="true"/>
port="45564"
frequency="500"
dropTime="3000"/>
port="4001" //端口号不能和tomcat1重复
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
在
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);
%>