前端代理伺服器nginx:192.168.223.136
tomcat伺服器:採用的一臺多例項192.168.223.146:8081,192.168.223.146:8082(如何構建多例項tomcat,請參考前面的文章)
首先檢視下tomcat的webapps目錄架構:
[root@wadeson tomcat-instance]# pwd
/usr/local/tomcat-instance
[root@wadeson tomcat-instance]# ll
總用量 24
-rwxr-xr-x. 1 root root 165 8月 9 15:31 start-tomcat1.sh
-rwxr-xr-x. 1 root root 165 8月 9 16:18 start-tomcat2.sh
-rwxr-xr-x. 1 root root 165 8月 9 15:38 stop-tomcat1.sh
-rwxr-xr-x. 1 root root 165 8月 9 16:18 stop-tomcat2.sh
drwxr-xr-x. 7 root root 4096 8月 9 15:45 tomcat1
drwxr-xr-x. 7 root root 4096 8月 9 16:12 tomcat2
[root@wadeson tomcat-instance]# cd tomcat1/webapps/
[root@wadeson webapps]# tree .
.
├── myapp
│ └── test.jsp
└── ROOT
├── classes
├── index.jsp
├── lib
├── META-INF
└── WEB-INF
由於安裝的tomcat是8.5版本的,所以檢視下官方文件:https://tomcat.apache.org/tomcat-8.5-doc/cluster-howto.html
構建tomcat叢集只需要如下幾步:
1、新增叢集元件資訊(在host或者engine元件下新增進去就行)
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8"> <Manager className="org.apache.catalina.ha.session.DeltaManager" expireSessionsOnShutdown="false" notifyListenersOnReplication="true"/> <Channel className="org.apache.catalina.tribes.group.GroupChannel"> <Membership className="org.apache.catalina.tribes.membership.McastService" address="228.0.0.4" port="45564" frequency="500" dropTime="3000"/> <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver" address="auto" port="4000" autoBind="100" selectorTimeout="5000" maxThreads="6"/> <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter"> <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/> </Sender> <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/> <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor"/> </Channel> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve" filter=""/> <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/> <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer" tempDir="/tmp/war-temp/" deployDir="/tmp/war-deploy/" watchDir="/tmp/war-listen/" watchEnabled="false"/> <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/> </Cluster>
以上是直接摘自官網,需要稍微做下修改address="auto",
address="228.0.0.4"
2、需要在各自的應用程式目錄下面為web.xml新增一行<distributable/>元素
- Make sure your
web.xml
has the<distributable/>
element
現在直接貼自己的配置tomcat1:
<Host name="localhost" appBase="/usr/local/tomcat-instance/tomcat1/webapps" unpackWARs="true" autoDeploy="true">
<Context path="" docBase="ROOT" reloadable="true"/>
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="/usr/local/tomcat-instance/tomcat1/logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.223.146" 由於是一臺主機上的兩個tomcat例項,所以這裡的cluster新增的內容都一樣
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
</Host>
然後在應用程式ROOT下面的WEB-INF的下面新增自己的web.xml:
[root@wadeson tomcat-instance]# ll tomcat1/webapps/ROOT/WEB-INF/web.xml
-rw-------. 1 root root 168271 8月 10 16:50 tomcat1/webapps/ROOT/WEB-INF/web.xml
<distributable/> 這就是需要新增的一行內容
</web-app>
於是配置tomcat1例項完成,tomcat2的配置和tomcat1一致(由於是同一主機的不同例項)
於是進行訪問:
可以看見session的id值兩者相同,只是後面的tomcat不一致,於是session共享的功能就達成了,然後配置nginx進行代理轉發:
upstream backserver {
server 192.168.223.146:8081 weight=1;
server 192.168.223.146:8082 weight=1;
}
server {
listen 80;
server_name 192.168.223.136;
location / {
root html;
index index.html index.htm;
proxy_pass http://backserver/;
}
測試效果: