session會話保持之session服務器-tomcat + msm + memcached

拓撲圖

準備環境：
由於電腦配置爛，虛擬機有限，故一個虛擬機同時作多種服務器類型使用。
兩個tomcat節點：172.16.19.1(tomcatA.luo.com)，172.16.19.21(tomcatB.luo.com)
兩個memcached節點：172.16.19.21, 172.16.19.22
一個負載均衡節點(httpd)：172.16.19.1

兩邊都進行基本的jdk與tomcat安裝

安裝jdk

下載安裝包並安裝：

# rpm -ivh jdk-7u9-linux-x64.rpm 
Preparing...                ########################################### [100%]
   1:jdk                    ########################################### [100%]
Unpacking JAR files...
    rt.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_09/jre/lib/rt.pack
    jsse.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_09/jre/lib/jsse.pack
    charsets.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_09/jre/lib/charsets.pack
    tools.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_09/lib/tools.pack
    localedata.jar...
Error: Could not open input file: /usr/java/jdk1.7.0_09/jre/lib/ext/localedata.pack

說明：這些錯誤暫時可以忽略，不影響使用
查看java的安裝目錄
# ll /usr/java/
total 4
lrwxrwxrwx 1 root root 16 Sep 26 06:03 default -> /usr/java/latest
drwxr-xr-x 10 root root 4096 Sep 26 06:03 jdk1.7.0_09
lrwxrwxrwx 1 root root 21 Sep 26 06:03 latest -> /usr/java/jdk1.7.0_09
latest鏈接指定最新版本

修改環境變量
# vim /etc/profile.d/java.sh
export JAVA_HOME=/usr/java/latest
export PATH=$JAVA_HOME/bin:$PATH
# . /etc/profile.d/java.sh

查看版本信息
# java -version
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode)

安裝Tomcat
解壓並創建鏈接
# tar -xf apache-tomcat-7.0.42.tar.gz -C /usr/local
# cd /usr/local
# ln -sv apache-tomcat-7.0.42 tomcat
`tomcat' -> `apache-tomcat-7.0.42'

修改環境變量
# vim /etc/profile.d/tomcat.sh
export CATALINA_HOME=/usr/local/tomcat
export PATH=$CATALINA_HOME/bin:$PATH
# . /etc/profile.d/tomcat.sh

啓動tomcat

# catalina.sh start  # 或者使用命令startup.sh，默認使用8080端口，先確定端口沒有被佔用
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /usr/java/latest
Using CLASSPATH:       /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar

查看啓動的端口
# netstat -tnlp |grep java
tcp        0      0 :::8080                     :::*                        LISTEN      4357/java
tcp        0      0 ::ffff:127.0.0.1:8005       :::*                        LISTEN      4357/java
tcp        0      0 :::8009                     :::*                        LISTEN      4357/java

查看版本

# cd /usr/local/tomcat
# catalina.sh version 或者version.sh
Using CATALINA_BASE:   /usr/local/tomcat
Using CATALINA_HOME:   /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME:        /usr/java/latest
Using CLASSPATH:       /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
Server version: Apache Tomcat/7.0.42
Server built:   Jul 2 2013 08:57:41
Server number:  7.0.42.0
OS Name:        Linux
OS Version:     2.6.32-431.el6.x86_64
Architecture:   amd64
JVM Version:    1.7.0_09-b05
JVM Vendor:     Oracle Corporation

測試tomcat成功運行：

二、配置代理、負載均衡、memcached

memcached-session-manager項目地址，http://code.google.com/p/memcached-session-manager/

下載如下jar文件至各tomcat節點的tomcat安裝目錄下的lib目錄中，其中軟件的版本號要和tomcat是相同的版本號。

node、node1節點：

memcached-session-manager-1.8.2.jar
memcached-session-manager-tc7-1.8.2.jar
msm-javolution-serializer-1.8.2.jar
spymemcached-2.10.2.jar
javolution-5.5.1.jar

分別在兩個tomcat上的某host上定義一個用於測試的context容器，並在其中創建一個會話管理器，如下所示(node、node1節點)：

<Context path="/test" docBase="/usr/local/tomcat/webapps/test" reloadable="true">
   <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
       memcachedNodes="n1:172.16.19.21:11211,n2:172.16.19.22:11211"
       failoverNodes="n1"
       requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
       transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"/>
</Context>

分別爲兩個context提供測試頁面：

node(tomcatA):
# mkdir -pv /usr/local/tomcat/webapps/test/WEB-INF/{classes,lib}
# vim /usr/local/tomcat/webapps/test/index.jsp
添加如下內容：

<%@ page language="java" %>
<html>
  <head><title>TomcatA</title></head>
  <body>
    <h1><font color="red">TomcatA.luo.com</font></h1>
    <table align="centre" border="1">
      <tr>
        <td>Session ID</td>
    <% session.setAttribute("luo.com","luo.com"); %>
        <td><%= session.getId() %></td>
      </tr>
      <tr>
        <td>Created on</td>
        <td><%= session.getCreationTime() %></td>
     </tr>
    </table>
  </body>
</html>

node1(tomcatB):
# mkdir -pv /usr/local/tomcat/webapps/test/WEB-INF/{classes,lib}
# vim /usr/local/tomcat/webapps/test/index.jsp
添加如下內容：

<%@ page language="java" %>
<html>
  <head><title>TomcatB</title></head>
  <body>
    <h1><font color="red">TomcatB.luo.com</font></h1>
    <table align="centre" border="1">
      <tr>
        <td>Session ID</td>
    <% session.setAttribute("luo.com","luo.com"); %>
        <td><%= session.getId() %></td>
      </tr>
      <tr>
        <td>Created on</td>
        <td><%= session.getCreationTime() %></td>
     </tr>
    </table>
  </body>
</html>

在node節點（172.16.19.1）上配置反向代理的負載均衡內容

可以新建個文件mod_http.con，類似如下所示：

配置apache通過mod_proxy模塊與Tomcat連接

查看相關模塊是否啓用

[root@node ~]# httpd -M |grep proxy
Syntax OK
proxy_module (shared)
proxy_balancer_module (shared)
proxy_ftp_module (shared)
proxy_http_module (shared)
proxy_ajp_module (shared)
proxy_connect_module (shared)

# vim /etc/httpd/conf.d/mod_http.conf

<Proxy balancer://tomcat>
    BalancerMember  http://172.16.19.1:8080 loadfactor=1
    BalancerMember  http://172.16.19.21:8080 loadfactor=1
# 如果使用ajp則使用下面現行替換上面現行即可
#   BalancerMember  ajp://172.16.19.1:8009 loadfactor=1
#   BalancerMember  ajp://172.16.19.21:8009 loadfactor=1
    ProxySet  lbmethod=byrequests
</Proxy>

<Location /status>
    SetHandler balancer-manager
    ProxyPass !
    Order allow,deny
    Allow from all
</Location>

ProxyPass / balancer://tomcat/
ProxyPa***everse / balancer://tomcat/

基於mod_jk的負載均衡

# yum -y install httpd-devel
# rpm -ql httpd-devel |grep apxs
# tar xf tomcat-connectors-1.2.40-src.tar.gz
# cd tomcat-connectors-1.2.40-src/native
# ./configure --with-apxs=/usr/sbin/apxs
# make && make install

# cat /etc/httpd/conf.d/mod_jk.conf #新添加文件，把之前添加的mod_http.conf暫時改個後續名

LoadModule  jk_module  modules/mod_jk.so
JkWorkersFile  /etc/httpd/conf.d/workers.properties
JkLogFile  logs/mod_jk.log
JkLogLevel  debug #調試時使用debug
JkMount  /*  lbA
JkMount  /status/  statA

# cat /etc/httpd/conf.d/workers.properties

worker.list = lbA,statA
worker.TomcatA.type = ajp13
worker.TomcatA.host = 172.16.19.1
worker.TomcatA.port = 8009
worker.TomcatA.lbfactor = 1
worker.TomcatB.type = ajp13
worker.TomcatB.host = 172.16.19.21
worker.TomcatB.port = 8009
worker.TomcatB.lbfactor = 1
worker.lbA.type = lb
worker.lbA.sticky_session = 0
worker.lbA.balance_workers = TomcatA,TomcatB
worker.statA.type = status

需要在兩邊的主配置文件中加上jvmRoute參數
# cat /usr/local/tomcat/conf/server.xml
<Engine name=”catalina” defaultHost=”localhost” jvmRoute=”TomcatA ”>
<Engine name=”catalina” defaultHost=”localhost” jvmRoute=”TomcatB ”>

# catalina.sh start
# service httpd restart

三、配置node1與node2的memcached

# yum install –y install memcached

# service memcached start

# ss –tnl |grep 11211

四、測試結果
在瀏覽器中訪問http://172.16.19.1/test，結果如下所示，其session ID在負載均衡環境中保持不變。

負載均衡與session綁定已經可以實現

2、模擬node2故障，停止node2的memcached，可以看到已經轉到n1（memcached1）上面了且session保持不變
[root@node2 ~]# service memcached stop

session會話保持之session服務器-tomcat + msm + memcached

我的友情鏈接

keepalived雙主模型高可用+lvs-實例

LVM 邏輯卷管理

httpd.conf配置文件總結

緩存服務器-varnish

Mac下配置sublime實現LaTeX

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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