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Today, the editor will share with you the relevant knowledge points about how to achieve session server session persistence through Memcached. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

Memcached is a high-performance distributed in-memory object caching system, which is used for dynamic Web applications to reduce database load. It reduces the number of times to read the database by caching data and objects in memory, thus improving the speed of dynamic, database-driven websites.

Three ways of session persistence

Session sticky session binding: unified session sending to the same backend server in the configuration of the front-end scheduler

Session cluster session clustering: keep the session information of all Tomcat consistent by configuring Tomcat.

Session server session service: all session is handed over to a dedicated session service management.

The third way is to use Memcached to do session server.

I. Architecture Diagram

System environment

All servers use CentOS7.3

Required software package

The following files should be placed in the class library directory on the tomcat server host

Rpm-ql tomcat-lib # / usr/share/java/tomcat/ # yum is installed in this directory by default / usr/local/tomcat/lib # is installed in the official website rpm by default in this directory memcached-session-manager-1.8.3.jar http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/1.8.3/ Memcached-session-manager-tc7-1.8.3.jar http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc7/1.8.3/spymemcached-2.11.1.jar http://repo1.maven.org/maven2/net/spy/spymemcached/2.11.1/javolution-5.4.3.1.jar http://memcached-session-manager.googlecode.com/svn/maven / javolution/javolution/5.4.3.1/msm-javolution-serializer-1.8.3.jar http://repo1.maven.org/maven2/de/javakaffee/msm/msm-javolution-serializer/1.8.3/ II. Detailed configuration of Apache

Install httpd

Yum install httpd

Create a profile

Create a new configuration file under / etc/httpd/conf.d

Shell > vim / etc/httpd/conf.d/ajp-tomcat.conf # # define host group BalancerMember ajp://172.18.68.21:8009 route=tomcatA BalancerMember ajp://172.18.68.22:8009 route=tomcatB ProxySet lbmethod=byrequests # # create virtual host ServerName www.baidu.com ProxyVia On ProxyRequests Off ProxyPreserveHost On proxyvia on Require all granted ProxyPass / balancer://tomcatservers/ # set all schedules To backend ProxyPassReverse / balancer://tomcatservers/ # set all schedules to backend # centos7 reject by default Therefore, it is necessary to allow the management page of Require all granted # apache SetHandler balancer-manager ProxyPass! # that matches to apache not to be proxied. Require all granted # set allow # shell > systemctl start httpd 3. Configuration of Tomcat

The configuration of the two tocat is more or less the same, and the configuration files are basically the same, except that the two test pages created later are different.

Install Tomcat

Yum install tomcat tomcat-admin-webapps tomcat-webapps

Modify the configuration file

There is a server.xml file under / etc/tomcat/. Open this file and add or modify the following configuration in the host tag.

Vim / etc/tomcat/server.xml configures the following content within the host tag. The yellow mark section is a streaming management tool. If you use other streaming tools, you can change these two names.

Download dependent software packages

Place the soft cloth at the end of all the .jar files mentioned at the beginning of the article in the class library directory on the tomcat server host

Rpm-ql tomcat-lib # use this command to check the directory where the .jar files are stored, which is the directory of the class library files / usr/share/java/tomcat/ # yum installed tomcat class library path / usr/local/tomcat/lib # tomcat class library path installed on the official website rpm

Add a test page

The following two test pages are different, so create them in their respective directories.

Add a test page in tomcatA

Shell > mkdir-pv / usr/local/tomcat/webapps/test/WEB-INF/ {classes,lib} shell > vim / usr/local/tomcat/webapps/test/index.jsp add the following:

Start the service

Systemctl start tomcat IV. Memcached configuration

Mechached is basically not configured, just install and start the service.

Yum install memcachedsystemctl start memcached 5. Testing

Use a browser to access http://172.18.68.11, and refresh it several times. As long as the value in the SessionID column remains the same, it means that the session has remained the same.

These are all the contents of the article "how to achieve session server session persistence through Memcached". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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