1. 准备好tomcat

第一台

tar vxf apache-tomcat-7.0.54.tar.gz

mv apache-tomcat-7.0.54 /usr/local/tomcat

tar vxf jdk-7u65-linux-x64.tar.gz

mv jdk1.7.0_65/ /usr/local/java

编辑vim /etc/profile加

export JAVA_HOME=/usr/local/java       #设置java根目录

export PATH=$PATH:$JAVA_HOME/bin  #在PATH环境变量中添加java跟目录的bin子目录

启动tomcat服务

/usr/local/tomcat/bin/startup.sh

打开浏览器，ip：8080显示tomcat主页

关闭服务；

/usr/local/tomcat/bin/shutdown.sh

建立一个web 站点

cd webapps/

mkdir web

vim index.jsp

Server Info:

SessionID:<%=session.getId()%>

<br>

SessionIP:<%=request.getServerName()%>

<br>

SessionPort:<%=request.getServerPort()%>

<br>

<%

out.println("server one");

%>

修改Tomcat的server.xml文件

cp server.xml server.xml.bak

vim server.xml

<Host name="localhost"  appBase="webapps" unpackWARs="true" autoDeploy="true">

<Context docBase="web" path="" reloadable="flase">

</Context>

</Host>

/usr/local/tomcat/bin/shutdown.sh

/usr/local/tomcat/bin/startup.sh

打开浏览器，ip：8080显示tomcat主页

第二台

与第一台基本一致，更改测试页的ip地址

scp root@172.16.1.2:/usr/local/tomcat/webapps/web/index.jsp .

scp root@172.16.1.2:/usr/local/tomcat/conf/server.xml  .

启动服务/usr/local/tomcat/bin/startup.sh

查看服务

netstat -anpult |grep java

浏览器访问测试 http://ip:8080

显示正常

2.准备nginx

第一台

源码安装nginx,

修改配置文件，配置负载均衡

cp /usr/local/nginx/conf/nginx.conf{,.bak}

vim /usr/local/nginx/conf/nginx.conf

加upstream tomcat_server {

server 172.16.1.12:8080 weight=1;

server 172.16.1.2:8080 weight=1;

}

proxy_pass http://tomcat_server;

语法检查

/usr/local/nginx/sbin/nginx –t

启动服务/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf

或者killadd -1 nginx

打开浏览器访问: http://ip ，该ip为nginx 的ip，刷新浏览器，会显示两台

第二台

nginx-2服务器配置：

配置方式与服务器nginx-1一致

客户端测试：

打开浏览器访问: http://ip    #不断刷新可看到由于权重相同，页面会反复切换

3.安装配置keepalived

yum -y install keepalived

修改配置文件vim keepalived.conf

配置一个实例名字为VI_2，状态作为主，优先级100

vrrp_instance VI_2 {

#备用服务器上为 BACKUP

state MASTER

#绑定vip的网卡为ens33

interface ens33

virtual_router_id 51

#备用服务器上为90

nopreempt                                        #为不抢占模式

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

#track_script {

#nginx

#}

virtual_ipaddress {                               #配置虚拟ip地址

172.16.1.200

}

}

vrrp_instance VI_1 {                                  #配置另一个实例 VI_1，状态为 从，优先级为90

state BACKUP

interface ens33

virtual_router_id 51

priority 90

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {                                  #配置虚拟ip地址为254

192.168.200.254

}

}

配置第二台

Vim keepalive.conf

vrrp_instance VI_2 {                                             #实例名字为VI_2，状态作为从，优先级90

#备用服务器上为 BACKUP

state SLAVE

#绑定vip的网卡为ens33

interface ens33

virtual_router_id 51

#备用服务器上为90

nopreempt

priority 90

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

172.16.1.200                                                         #配置虚拟ip地址

}

}

vrrp_instance VI_1 {                                                          #配置另一个实例 VI_1，状态为主，优先级为100

state MASTER

interface ens33

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.200.254

}

}

测试，关闭一台keepalived,打开浏览器，刷新页面，两台机器网页交替更新，测试正常

实现高可用。

4．安装memcached，实现session会话保持。

yum -y install gcc openssl-devel pcre-devel zlib-devel

先安tar xf libevent-2.0.15-stable.tar.gz

cd libevent-2.0.15-stable

./configure --prefix=/usr/local/libevent && make && make install

再装memcached

tar xf memcached-1.4.5.tar.gz

cd memcached-1.4.5

./configure --prefix=/usr/local/memcached --with-libevent=/usr/local/libevent/ && make && make install

配置

/usr/local/memcached/bin/memcached -u root -m 512M -n 10 -f 2 -d -vvv -c 512

vim /etc/ld.so.conf

include ld.so.conf.d/*.conf

/usr/local/libevent/lib/

Ldconfig

/usr/local/memcached/bin/memcached -u root -m 512M -n 10 -f 2 -d -vvv -c 512

netstat  -antp| grep :11211

显示端口开启

安装telnet测试yum -y install telnet

telnet 192.168.200.103 11211

显示正常

最后执行让Tomcat-1  Tomcat-2 通过（msm）连接到Memcached

将session包中的“*.jar复制到/usr/local/tomcat/lib/ 下面

cp session/* /usr/local/tomcat/lib/使tomcat支持memcached,

tomcat-1  和  tomcat-2   配置文件一模一样.

vim /usr/local/tomcat7/conf/context.xml

重启服务tomcat

/usr/local/tomcat/bin/shutdown.sh

/usr/local/tomcat/bin/startup.sh

如果成功，tomcat与Memcached 端口会连在一起，前后有变化

Tomcat-1与Tomcat-2如下图

netstat -antp|grep java

tcp        0      0 ::ffff:127.0.0.1:8005       :::*                        LISTEN      62496/java

tcp        0      0 :::8009                     :::*                        LISTEN      62496/java

tcp        0      0 :::8080                     :::*                        LISTEN      62496/java

tcp        0      0 ::ffff:192.168.200.10:28232 ::ffff:192.168.200.10:11211 ESTABLISHED 62496/java

tcp        0      0 ::ffff:192.168.200.10:28231 ::ffff:192.168.200.10:11211 ESTABLISHED 62496/java

tcp        0      0 ::ffff:192.168.200.10:28230 ::ffff:192.168.200.10:11211 ESTABLISHED 62496/java

tcp        0      0 ::ffff:192.168.200.10:28228 ::ffff:192.168.200.10:11211 ESTABLISHED 62496/java

tcp        0      0 ::ffff:192.168.200.10:28229 ::ffff:192.168.200.10:11211 ESTABLISHED 62496/java

[root@tomcat-1 ~]# netstat -antp|grep memcached

tcp        0      0 0.0.0.0:11211               0.0.0.0:*                   LISTEN      62402/memcached

tcp        0      0 192.168.200.103:11211       192.168.200.103:28230       ESTABLISHED 62402/memcached

tcp       45      0 192.168.200.103:11211       192.168.200.103:28228       ESTABLISHED 62402/memcached

tcp        0      0 192.168.200.103:11211       192.168.200.103:28232       ESTABLISHED 62402/memcached

tcp        0      0 192.168.200.103:11211       192.168.200.103:28229       ESTABLISHED 62402/memcached

tcp        0      0 192.168.200.103:11211       192.168.200.103:28231       ESTABLISHED 62402/memcached

tcp        0      0 :::11211                    :::*                        LISTEN      62402/memcached