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  • Tomcat8.5 基于memcached配置session共享

    环境准备:

    • 时间同步,确保NTP或Chrony服务正常运行。
    • 防火墙规则
    • 禁用SELinux
    • 三台主机
     IP  主机名  服务  软件
     10.0.1.8  proxy  调度器  CentOS8、Nginx
     10.0.1.18  t1 tocmat1  CentOS8、JDK8、Tomcat8、memcached
     10.0.1.28  t1 tomcat2   CentOS8、JDK8、Tomcat8、memcached

     

    1.配置nginx充当proxy

     [root@proxy ~]#cat /etc/nginx/nginx.conf

    http {
    ......
         upstream tomcat-server {
         #ip_hash;
         server t1.magedu.org:8080;
       server t2.magedu.org:8080;
          }
         server {
           ......
           location / {
            }
           location ~* .(jsp|do)$ {
           proxy_pass http://tomcat-server;
              }
    }
    }

     [root@proxy ~]#cat /etc/hosts

    10.0.1.8 proxy.magedu.org proxy
    10.0.1.18 t1.magedu.org t1
    10.0.1.28 t2.magedu.org t2

     2.配置memcached

          2.1在tomcat1上配置memcached

    [root@t1 ~]#dnf -y install memcached
    [root@t1 ~]#vim /etc/sysconfig/memcached
    [root@t1 ~]#cat /etc/sysconfig/memcached
    PORT="11211"
    USER="memcached"
    MAXCONN="1024"
    CACHESIZE="64"
    #注释下面行
    #OPTIONS="-l 127.0.0.1,::1"
    [root@t1 ~]#systemctl enable --now memcached.service

        2.2 在tomcat2 上配置memcached

           配置和t1相同

    [root@t2 ~]#dnf -y install memcached
    [root@t2 ~]#vim /etc/sysconfig/memcached
    [root@t2 ~]#cat /etc/sysconfig/memcached
    PORT="11211"
    USER="memcached"
    MAXCONN="1024"
    CACHESIZE="64"
    #注释下面行
    #OPTIONS="-l 127.0.0.1,::1"
    [root@t2 ~]#systemctl enable --now memcached.service

    3.配置 tomcat

       配置tomcat1

    [root@t1 tomcat]#vim conf/server.xml
    <Engine name="Catalina" defaultHost="t1.magedu.org" jvmRoute="Tomcat1">
    ......
    <Host name="t1.magedu.org" appBase="/data/webapps" autoDeploy="true" >
    </Host>
    </Engine>
    </Service>
    </Server>
    [root@t1 tomcat]#vim conf/context.xml
    <Context>
    ......
    <Manager pathname="" />
    -->
    ###倒数第一行前,即</Context>行的前面,加下面内容
    <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
        memcachedNodes="n1:10.0.1.18:11211,n2:10.0.1.28:11211"
        failoverNodes="n1"
        requestUriIgnorePattern=".*.(ico|png|gif|jpg|css|js)$"
        transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"/>
    </Context> #最后一行
    #将相关包传到lib/目录下
    asm-5.2.jar
    kryo-3.0.3.jar
    kryo-serializers-0.45.jar
    memcached-session-manager-2.3.2.jar
    memcached-session-manager-tc8-2.3.2.jar
    minlog-1.3.1.jar
    msm-kryo-serializer-2.3.2.jar
    objenesis-2.6.jar
    reflectasm-1.11.9.jar
    spymemcached-2.12.3.jar
    [root@t1 tomcat]#
    ls lib/ -t |tail kryo-3.0.3.jar asm-5.2.jar objenesis-2.6.jar reflectasm-1.11.9.jar minlog-1.3.1.jar kryo-serializers-0.45.jar msm-kryo-serializer-2.3.2.jar memcached-session-manager-tc8-2.3.2.jar spymemcached-2.12.3.jar memcached-session-manager-2.3.2.jar

    [root@t1 tomcat]#chown -R tomcat.tomcat /data/webapps/ROOT/

    [root@t1 tomcat]#systemctl restart tomcat

    [root@t1 tomcat]#mkdir /data/webapps/ROOT -p
    [root@t1 tomcat]#vi /data/webapps/ROOT/index.jsp

    <%@ page import="java.util.*" %>
    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <title>tomcat test</title>
    </head>
    <body>
    <h1> tomcat website1 </h1>
    <div>On <%=request.getServerName() %></div>
    <div><%=request.getLocalAddr() + ":" + request.getLocalPort() %></div>
    <div>SessionID = <span style="color:blue"><%=session.getId() %></span></div>
    <%=new Date()%>
    </body>
    </html>

      同理配置tomcat2

    #t2参考上面t1做配置
    [root@t2 tomcat]#vim conf/server.xml
    <Engine name="Catalina" defaultHost="t2.magedu.org" jvmRoute="Tomcat2">
    ......
    <Host name="t2.magedu.org" appBase="/data/webapps" autoDeploy="true" >
    </Host>
    </Engine>
    </Service>
    </Server>
    [root@t2 tomcat]#vim conf/context.xml
    <Context>
    ......
    <Manager pathname="" />
    -->
    ####################加下面内容################
    <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
        memcachedNodes="n1:10.0.1.18:11211,n2:10.0.1.28:11211"
        failoverNodes="n2" #只修改此行,和t1不同,其它都一样
        requestUriIgnorePattern=".*.(ico|png|gif|jpg|css|js)$"
        transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFact
        ory"
      />
    ####################加上面内容################
    </Context>
    #将相关包传到lib/目录下
    asm-5.2.jar
    kryo-3.0.3.jar
    kryo-serializers-0.45.jar
    memcached-session-manager-2.3.2.jar
    memcached-session-manager-tc8-2.3.2.jar
    minlog-1.3.1.jar
    msm-kryo-serializer-2.3.2.jar
    objenesis-2.6.jar
    reflectasm-1.11.9.jar
    spymemcached-2.12.3.jar

    [root@t2 tomcat]#vi /data/webapps/ROOT/index.jsp
    <%@ page import="java.util.*" %>
    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <title>tomcat test</title>
    </head>
    <body>
    <h1> tomcat website2 </h1>
    <div>On <%=request.getServerName() %></div>
    <div><%=request.getLocalAddr() + ":" + request.getLocalPort() %></div>
    <div>SessionID = <span style="color:blue"><%=session.getId() %></span></div>
    <%=new Date()%>
    </body>
    </html>

    [root@t1 tomcat]#chown -R tomcat.tomcat /data/webapps/ROOT/
    [root@t2 tomcat]#systemctl restart tomcat

    4.查看日志

    [root@t1 tomcat]#tail -n 20 logs/catalina.out
    2020-12-11 15:30:49.092 INFO net.spy.memcached.MemcachedConnection:  Setting retryQueueSize to -1
    2020-12-11 15:30:49.098 INFO net.spy.memcached.MemcachedConnection:  Added {QA sa=/10.0.1.18:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue
    2020-12-11 15:30:49.110 INFO net.spy.memcached.MemcachedConnection:  Added {QA sa=/10.0.1.28:11211, #Rops=0, #Wops=0, #iq=0, topRop=null, topWop=null, toWrite=0, interested=0} to connect queue
    11-Dec-2020 15:30:49.125 INFO [t1.magedu.org-startStop-1] de.javakaffee.web.msm.RequestTrackingHostValve.<init> Setting ignorePattern to .*.(ico|png|gif|jpg|css|js)$
    11-Dec-2020 15:30:49.136 INFO [t1.magedu.org-startStop-1] de.javakaffee.web.msm.MemcachedSessionService.setLockingMode Setting lockingMode to null
    11-Dec-2020 15:30:49.138 INFO [t1.magedu.org-startStop-1] de.javakaffee.web.msm.MemcachedSessionService.createTranscoderFactory Creating transcoder factory de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory
    11-Dec-2020 15:30:49.156 INFO [t1.magedu.org-startStop-1] de.javakaffee.web.msm.serializer.kryo.KryoTranscoder.<init> Starting with initialBufferSize 102400, maxBufferSize 2048000 and defaultSerializerFactory de.javakaffee.web.msm.serializer.kryo.DefaultFieldSerializerFactory
    11-Dec-2020 15:30:49.162 INFO [t1.magedu.org-startStop-1] de.javakaffee.web.msm.MemcachedSessionService.startInternal --------
    -  finished initialization:
    - sticky: true
    - operation timeout: 1000
    - node ids: [n2]
    - failover node ids: [n1]
    - storage key prefix: null
    - locking mode: null (expiration: 5s)
    --------
    11-Dec-2020 15:30:49.189 INFO [t1.magedu.org-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/data/webapps/ROOT] has finished in [990] ms
    11-Dec-2020 15:30:49.206 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
    11-Dec-2020 15:30:49.234 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
    11-Dec-2020 15:30:49.236 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 1118 ms

    5.访问测试 http://proxy.magedu.org/index.jsp 反复刷新页面显示如下:

     

     说明:配置成功!!!

    6.通过python脚本测试

        6.1在t1 上安装部署python3环境,访问memcached

    [root@t1 tomcat]#vi showmemcached.py
    #!/usr/bin/python3
    import memcache # pip install python-memcached
    mc = memcache.Client(['10.0.1.18:11211','10.0.1.28:11211'], debug=True)
    print('-' * 30)
    #查看全部 key
    #for x in mc.get_stats('items'): # stats items 返回 items:5:number 1
    # print(x)
    #print('-' * 30)
    for x in mc.get_stats('cachedump 5 0'):print(x)

    [root@t1 tomcat]#chmod +x showmemcached.py

    [root@t1 tomcat]#./showmemcached.py
    ------------------------------
    ('10.0.1.18:11211 (1)', {'6C53482119B3B15FB21A9CC9FD70CBA7-n1.Tomcat2': '[97 b; 1607675590 s]'})
    ('10.0.1.28:11211 (1)', {'6C53482119B3B15FB21A9CC9FD70CBA7-n2.Tomcat1': '[97 b; 1607636279 s]'})

     之后多次刷新页面,执行脚本后,session信息不在变化,那么恭喜你配置成功!!!

    备注相关共享包下载地址:

    链接:https://pan.baidu.com/s/15wFtkx_VHLBp49MJJ_Ub4Q
    提取码:vbf4
    官方文档地址:https://github.com/magro/memcached-session-manager/wiki/SetupAndConfiguration#example-for-non-sticky-sessions--kryo--redis

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  • 原文地址:https://www.cnblogs.com/yds941268778/p/14121013.html
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