10.18. tomcat配合memcached会话管理¶
这里使用192.168.46.151作为调度器，后端使用192.168.46.152，192.168.46.153作为tomcat服务器。
10.18.1. tomcat安装¶
[root@centos-152 ~]# yum search openjdk
[root@centos-152 ~]# yum install java-1.8.0-openjdk.x86_64
[root@centos-152 ~]# java -version
[root@centos-152 ~]# yum install tomcat tomcat-lib tomcat-admin-webapps tomcat-webapps tomcat-docs-webapp
[root@centos-152 ~]# systemctl restart tomcat
[root@centos-152 ~]# ss -tul
[root@centos-153 ~]# yum search openjdk
[root@centos-153 ~]# yum install java-1.8.0-openjdk.x86_64
[root@centos-153 ~]# java -version
[root@centos-153 ~]# yum install tomcat tomcat-lib tomcat-admin-webapps tomcat-webapps tomcat-docs-webapp
[root@centos-153 ~]# systemctl restart tomcat
[root@centos-153 ~]# ss -tul
10.18.2. 前端调度配置¶
[root@centos-151 ~]# yum install nginx
[root@centos-151 ~]# vim /etc/nginx/nginx.conf
# 添加和修改如下内容
upstream webend {
server 192.168.46.152;
server 192.168.46.153;
}
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name _;
root /usr/share/nginx/html;
# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;
location / {
proxy_pass http://webend ;
index index.jsp index.html;
}
[root@centos-151 ~]# systemctl restart nginx
[root@centos-151 ~]# ss -tunl
10.18.3. 后端tomcat样例页准备¶
[root@centos-152 ~]# mkdir -pv /usr/share/tomcat/webapps/test/{classes,lib,WEB-INF,META-INF}
[root@centos-152 ~]# vim /usr/share/tomcat/webapps/test/index.jsp
[root@centos-152 ~]# cat /usr/share/tomcat/webapps/test/index.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatA</title></head>
<body>
<h1><font color="red">TomcatA.linuxpanda.tech</font></h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("linuxpanda.tech","linuxpanda.tech"); %>
<td><%= session.getId() %></td>
</tr>
<tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
[root@centos-152 ~]# scp -rp /usr/share/tomcat/webapps/test/ 192.168.46.153:/usr/share/tomcat/webapps/
[root@centos-153 ~]# vim /usr/share/tomcat/webapps/test/index.jsp
[root@centos-153 ~]# cat /usr/share/tomcat/webapps/test/index.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatA</title></head>
<body>
<h1><font color="red">TomcatB.linuxpanda.tech</font></h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("linuxpanda.tech","linuxpanda.tech"); %>
<td><%= session.getId() %></td>
</tr>
<tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
# 启动tomcat
[root@centos-152 ~]# systemctl restart tomcat
[root@centos-153 ~]# systemctl restart tomcat
10.18.4. 测试调度情况¶
不断刷新，发现页面和sesssionId,都会不断变化的，chroom浏览器测试有点问题，建议firefox浏览器测试。
10.18.5. 配置tomcat支持memcached会话管理¶
# 查看tomcat版本
[root@centos-152 msm]# yum info tomcat |grep Version
Version : 7.0.76
# 先下载下会话管理对应的包
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/2.3.0/memcached-session-manager-2.3.0.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc7/2.3.0/memcached-session-manager-tc7-2.3.0.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/net/spy/spymemcached/2.12.3/spymemcached-2.12.3.jar
# 下载序列化需要的包
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/org/objenesis/objenesis/2.6/objenesis-2.6.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/org/ow2/asm/asm/6.1.1/asm-6.1.1.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/com/esotericsoftware/reflectasm/1.11.3/reflectasm-1.11.3.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/com/esotericsoftware/minlog/1.3.0/minlog-1.3.0.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/com/esotericsoftware/kryo/4.0.2/kryo-4.0.2.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/kryo-serializers/0.42/kryo-serializers-0.42.jar
[root@centos-152 ~]# wget http://repo1.maven.org/maven2/de/javakaffee/msm/msm-kryo-serializer/2.3.0/msm-kryo-serializer-2.3.0.jar
# 查看下载的包
[root@centos-152 msm]# ll
total 1312
-rw-r--r-- 1 root root 108252 Mar 25 22:20 asm-6.1.1.jar
-rw-r--r-- 1 root root 337512 Mar 21 05:02 kryo-4.0.2.jar
-rw-r--r-- 1 root root 106032 Jul 17 2017 kryo-serializers-0.42.jar
-rw-r--r-- 1 root root 167266 Mar 19 06:29 memcached-session-manager-2.3.0.jar
-rw-r--r-- 1 root root 11704 Mar 19 06:33 memcached-session-manager-tc7-2.3.0.jar
-rw-r--r-- 1 root root 5711 Jul 21 2014 minlog-1.3.0.jar
-rw-r--r-- 1 root root 38268 Mar 19 06:37 msm-kryo-serializer-2.3.0.jar
-rw-r--r-- 1 root root 55684 Jun 20 2017 objenesis-2.6.jar
-rw-r--r-- 1 root root 20883 May 9 2016 reflectasm-1.11.3.jar
-rw-r--r-- 1 root root 473774 May 1 2017 spymemcached-2.12.3.jar
# 复制到tomcat的lib目录去
[root@centos-152 msm]# cp *.jar /usr/share/tomcat/lib/
[root@centos-152 msm]# scp *.jar 192.168.46.153:/usr/share/tomcat/lib/
[root@centos-152 msm]# vim /etc/tomcat/server.xml
# 在默认的Host片段添加如下内容
<Context path="/test" docBase="/usr/share/tomcat/webapps/test" reloadable="" >
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="n1:192.168.46.152:11211,n2:192.168.46.153:11211"
failoverNodes="n1"
requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"
/>
</Context>
[root@centos-152 msm]# scp /etc/tomcat/server.xml 192.168.46.153:/etc/tomcat/
# 安装memcached
[root@centos-152 msm]# yum install memcached
[root@centos-152 msm]# systemctl start memcached
[root@centos-152 msm]# systemctl restart tomcat
[root@centos-153 msm]# yum install memcached
[root@centos-153 msm]# systemctl start memcached
[root@centos-153 msm]# systemctl restart tomcat
10.18.6. 测试¶
再次刷新下
可以发现，sessionId就是不变的， 说明我们使用tomcat配合memcached是成功的，接下来我们停掉node2的memcached再次测试下。
再次刷新下
可以发现节点变了， 但是会话id还是一样的。 没有问题。