nginx+tomcat+memcached Cluster

The Tomcat cluster session synchronization scheme is available in several ways:

• With the cluster method of Tomcat, it is easy to configure the session information automatically in real-time with multiple tomcat. However, this scheme is inefficient and does not perform well in large concurrency. Principle: http://zyycaesar.iteye.com/blog/296606

• Using Nginx's IP-based hash routing strategy, it is easier to ensure that IP access is always routed to the same tomcat. But if the application is a large number of users of a local area network logged in at the same time, so load balancing does not work.
• Using Nginx plugin to achieve Tomcat cluster and session synchronization, Nginx-upstream-jvm-route-0.1.tar.gz, is an nginx extension module, used to implement the function of Cookie-based session Sticky, can be obtained through http://code.google.com/p/nginx-upstream-jvm-route/downloads/list.

• Using memcached to centralize the session of multiple tomcat, the front-end is separated by the Nginx load balancing and dynamic static resources, which can guarantee the high performance while the system level is extended.

The following fourth scenario uses the cluster environment:

1. Nginx Latest Version: 1.5.7

2. Tomcat version: 6.0.37

3. memcached Latest Version: 1.4.15

4. Session replication synchronization using Memcache-session-manager Latest version: 1.6.5

5. System: CentOS6.3

First, Nginx installation

-centos6.3 does not install gcc-c++ by default and GCC is installed first:

Yum-y Install gcc-c++

Remember to reboot the system when you finish loading.

-CD to installation directory

Cd/usr/lcoal/src

-Install Pcre Library

Cd/usr/local/srcwget FTP://FTP.CSX.CAM.AC.UK/PUB/SOFTWARE/PROGRAMMING/PCRE/PCRE-8.21.TAR.GZTAR-ZXVF PCRE-8.21.TAR.GZCD Pcre-8.21./configuremakemake Install

If wget download, go to the official website to download pcre-8.12.tar.gz package copy to SRC.

-Install zlib Library

CD/USR/LOCAL/SRC wget http://zlib.net/zlib-1.2.8.tar.gztar-zxvf zlib-1.2.8.tar.gzcd zlib-1.2.8./configuremakemake Install

-Install SSL

Cd/usr/local/srcwget HTTP://WWW.OPENSSL.ORG/SOURCE/OPENSSL-1.0.1C.TAR.GZTAR-ZXVF openssl-1.0.1c.tar.gz

-Installation of Nginx

CD nginx-1.5.7./configure--prefix=/usr/local/nginx/nginx--with-http_ssl_module--with-pcre=/usr/local/src/ pcre-8.12--with-zlib=/usr/local/src/zlib-1.2.8--with-openssl=/usr/local/src/openssl-1.0.1c Makemake Install

Installation successful, cd/usr/local/nginx/conf/nginx.conf, modify configuration file:

HTTP {...    Upstream localhost {        server    localhost:8081;        Server    localhost:8082;        Server    localhost:8083;    } ...} Location/{      root   html;      Index  index.html index.htm;      Proxy_pass   http://localhost;      Proxy_redirect    off;      Proxy_set_header   Host $host;      Proxy_set_header   x-real-ip $remote _addr;      Proxy_set_header   x-forwarded-for $proxy _add_x_forwarded_for;       Client_max_body_size   10m;      Client_body_buffer_size   128k;      Proxy_connect_timeout   ;      Proxy_send_timeout   ;      Proxy_read_timeout   ;      Proxy_buffer_size   4k;      Proxy_buffers   4 32k;      Proxy_busy_buffers_size   64k;      Proxy_temp_file_write_size  64k;        }

Second, memcached installation

-memcached installation is simple, you need to libevent the library first:

Install libevent libevent-develwget http://www.danga.com/memcached/dist/memcached-1.4.15.tar.gz tar zxf memcached-1.4.  tar. GZCD memcached-1.4.  ./Configure makeinstall           

Installation succeeded (installed by default under bin), boot:

#-VV Console output #-d background run/USR/LOCAL/BIN/MEMCACHED-VV 

After startup, you can telnet to look at the status:

127.0.11211stats 

Three, Tomcat configuration

1. Modify Server.xml

<EngineName= "Catalina"Defaulthost= "localhost"Jvmroute= "JVM1">...<ContextPath=""DocBase= "/demo/appserver/app/cluster"Debug= "0"Reloadable= "true"Crosscontext= "true"><Manager
ClassName= "De.javakaffee.web.msm.MemcachedBackupSessionManager"memcachednodes= "n1:192.168.2.43:11211" requesturiignorepattern= ". *\." ( png|gif|jpg|css|js|ico|jpeg|htm|html) $ " Sessionbackupasync=" false " sessionbackuptimeout=" 1800000 " copycollectionsforserialization=" false " transcoderfactoryclass=" De.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory " /></Context> 

Nginx+tomcat+memcached cluster