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Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

1> 基礎(chǔ)環(huán)境

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

簡(jiǎn)易拓?fù)鋱D:

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

2> 部署Tomcat

[root@node01 ~]# ll -h ~ |egrep ‘jdk|tomcat’
-rw-r–r– 1 root root 9.3M May 4 17:40 apache-tomcat-8.5.41.tar.gz
-rw-r–r– 1 root root 183M Jul 15 2018 jdk-8u171-linux-x64.tar.gz
[root@node01 ~]# tar zxf jdk-8u171-linux-x64.tar.gz
[root@node01 ~]# mv jdk1.8.0_171 /usr/local/
[root@node01 ~]# vim /etc/profile.d/Java.sh

JAVA_HOME=/usr/local/jdk1.8.0_171  JAVA_BIN=/usr/local/jdk1.8.0_171/bin  JRE_HOME=/usr/local/jdk1.8.0_171/jre  PATH=$PATH:/usr/local/jdk1.8.0_171/bin:/usr/local/jdk1.8.0_171/jre/bin  CLASSPATH=/usr/local/jdk1.8.0_171/jre/lib:/usr/local/jdk1.8.0_171/lib:/usr/local/jdk1.8.0_171/jre/lib/charsets.jar

[root@node01 ~]# . /etc/profile.d/java.sh
[root@node01 ~]# java -version
[root@node01 ~]# tar zxf apache-tomcat-8.5.41.tar.gz
[root@node01 ~]# mv apache-tomcat-8.5.41 /opt/tomcat8
[root@node01 ~]# cd /opt/tomcat8/
[root@node01 ~]# > webapps/ROOT/index.jsp
[root@node01 ~]# vim webapps/ROOT/index.jsp

<html>    <head>      <title>web session test</title>    </head>    <body>      <h1>10.100.1.121:8080</h1>      <h2>session: <%=session.getId()%> </h2>    </body>  </html>

[root@node01 ~]# ./bin/startup.sh

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

node02和node03和node01的部署方法一致,注意index.jsp信息要區(qū)分開。

3> Nginx代理Tomcat

[root@node01 ~]# cd ~
[root@node01 ~]# yum install -y pcre pcre-devel openssl openssl-devel
[root@node01 ~]# yum install -y nginx
[root@node01 ~]# vim /etc/nginx/nginx.conf
[root@node01 ~]# systemctl start nginx
[root@node01 ~]# systemctl enable nginx

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

[root@node01 ~]# /usr/sbin/nginx -s reload

訪問(wèn)http://10.100.1.121的請(qǐng)求會(huì)按權(quán)重輪流分發(fā)至各tomcat,但sessionID會(huì)隨著頁(yè)面刷新而變動(dòng)。

4> 安裝memcached

[root@node01 ~]# yum -y install libevent libevent-devel
[root@node01 ~]# systemctl start memcached
[root@node01 ~]# systemctl enable memcached
[root@node01 ~]# ps -ef|grep memcached
[root@node01 ~]# netstat -lnpt

5> 實(shí)現(xiàn)session共享

MSM(memcached session manager),MSM是一款實(shí)現(xiàn)Tomcat會(huì)話保持的管理組件,支持粘性和無(wú)粘性的配置,并且支持Memcached會(huì)話故障轉(zhuǎn)移。
[root@node01 ~]# yum install -y git
[root@node01 ~]# git clone https://github.com/magro/memcached-session-manager.git
以下為我整理的jar包,下載拷貝到各tomcat下lib目錄,可為你省去很多麻煩。
參考:https://github.com/magro/memcached-session-manager/wiki/SetupAndConfiguration#decide-which-serialization-strategy-to-use

wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/1.9.7/memcached-session-manager-1.9.7.jar  wget http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc8/1.9.7/memcached-session-manager-tc8-1.9.7.jar  wget http://repo1.maven.org/maven2/net/spy/spymemcached/2.12.2/spymemcached-2.12.2.jar  wget http://repo1.maven.org/maven2/com/esotericsoftware/kryo/4.0.0/kryo-4.0.0.jar  wget http://repo1.maven.org/maven2/org/ow2/asm/asm/5.2/asm-5.2.jar  wget http://repo1.maven.org/maven2/de/javakaffee/kryo-serializers/0.38/kryo-serializers-0.38.jar  wget http://repo1.maven.org/maven2/com/esotericsoftware/minlog/1.3.0/minlog-1.3.0.jar  wget http://repo1.maven.org/maven2/com/esotericsoftware/reflectasm/1.11.3/reflectasm-1.11.3.jar  wget http://repo1.maven.org/maven2/org/objenesis/objenesis/2.4/objenesis-2.4.jar  wget http://repo1.maven.org/maven2/de/javakaffee/msm/msm-kryo-serializer/1.9.7/msm-kryo-serializer-1.9.7.jar

配置context.xml
[root@node01 ~]# cd /opt/tomcat8/conf/
[root@node01 ~]# cp context.xml context.xml.bk
[root@node01 ~]# vim context.xml

 <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"           memcachedNodes="n1:10.100.1.121:11211,n2:10.100.1.122:11211,n3:10.100.1.123:11211"           lockingMode="auto"           sticky="false"           sessionBackupAsync="false"           sessionBackupTimeout= "1000"             copyCollectionsForSerialization="true"           requestUriIgnorePattern=".*.(ico|png|gif|jpg|css|js)$"           transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory" />

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

[root@node01 ~]# scp context.xml 10.100.1.122:/opt/tomcat8/conf/context.xml
[root@node01 ~]# scp context.xml 10.100.1.123:/opt/tomcat8/conf/context.xml

重啟tomcat服務(wù)后檢測(cè)效果,n3表示當(dāng)前session保存在node03節(jié)點(diǎn)的mencached上,

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

停掉node03節(jié)點(diǎn)的memcached服務(wù),刷新頁(yè)面,
[root@node03 tomcat8]# systemctl stop memcached
[root@node03 tomcat8]# ps -ef |grep memcached
root 7412 6754 0 19:46 pts/0 00:00:00 grep –color=auto memcached
刷新頁(yè)面,session會(huì)話轉(zhuǎn)移到n1這個(gè)memcached上了,但sessionID依然沒(méi)有改變,說(shuō)明session已共享。關(guān)閉任一節(jié)點(diǎn)的tomcat服務(wù),發(fā)現(xiàn)從nginx負(fù)載過(guò)來(lái)的請(qǐng)求未分發(fā)至關(guān)停的tomcat上,sessionID也不會(huì)變。

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

關(guān)閉任一節(jié)點(diǎn)的tomcat服務(wù),發(fā)現(xiàn)從nginx負(fù)載過(guò)來(lái)的請(qǐng)求未分發(fā)至關(guān)停的tomcat上,sessionID也不會(huì)變。

查看catalina.out日志,
[root@node01 logs]# tailf catalina.out

Nginx+Tomcat8+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享

至此,Nginx+Tomcat+Memcached實(shí)現(xiàn)負(fù)載均衡及session共享就實(shí)現(xiàn)了。

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