Connect the memcached server and use the cluster to verify session ID
First, preparatory work, prepare two servers, one to do memcached server (a:4.123), a Web server (b:4.124)
1. Install the software on a: yum-y Install memcached.x86_64 telnet (for remote server testing)
2. Configure the installation LNMP environment on B
Second, the operation on Server A
1. Configuration profile: vim/etc/sysconfig/memcached
port= "11211"//service port number
User= "Memcached"
Maxconn= "1024x768"// Maximum number of connections
Cachesize= "64"//size of storage space
Options= ""//Optional parameter configuration
2, start the service, set boot from:
Systemctl Start Memcached.service
Systemctl Enable Memcached.service
3, connection, simple statement test
telnet 127.0.0.1 11211//Connect the database under the shell
Verify that you can read and write:
Set name 0 180 3//New name variable, not compressed, live 180 seconds, 3 character length
123//Input variable contents
STORED
Get name//Read the value of the name variable
VALUE Name 0 3
123
END
4, memcached some simple statements:
add--new (does not overwrite the previous content) set--new (overwrites the previous content)
append--Append (Append content to existing variable) flush_all--empty all content
Third, the operation on server B
1. Install Nginx, PHP, mariadb on B
Detailed installation refer to my other experiments, install the software and configure the configuration file.
Installation: yum-y install php-pecl-memcache.x86_64 to allow PHP files to connect to memcached database
Fill in the PHP file with a server's IP address information and port number: mem.php file
<?php
$memcache =new memcache;
$memcache->connect (' 192.168.4.123 ', 11211) or die (' could not connect!! '); Connecting to a database
$memcache->set (' key ', ' test '); Write Data
$get _values= $memcache->get (' key '); Reading data
echo $get _values; Display on the page
?>
2, on Server A authentication: http://192.168.4.124/mem.php, out "test" is to demonstrate the success of the verification
Four, session sessions in Memcached
1. Prepare two servers Java+tomcat (2.100 and 2.200)//can refer to my other experiments
Prepare a proxy server, with Nginx proxy, I use Server A to do proxy,
Install Nginx on the top and configure the Web cluster to be accessed with the real machine as a client.
2, sid Session: User account, password, access history and so on.
Cookie: Store ID number, next time direct login, do not need to enter user name and password
3. Put the test page in the root directory of the two default websites: test.jsp, test in client, get different ID
<body bgcolor= "Red" >
<center>
<%string s = Session.getid ();%>
<%=s%>
</center>
</body>
2.100:e8912319c717e184712fdf56f428176a Tomcata
2.200:9c842947128b1dde593e5b30d425e2a6 TOMCATB
From the above can be seen, get a different ID number, how to solve this problem,
Let Tomcat read and write user information on memcached
4, modify the configuration file: Vim/usr/local/tomcat/conf/context.xml
Change the address above to memcached address, the IP I use here is 192.168.2.123 (A)
5. Verification: http://www.test.com/test.jsp
The resulting results are: d3866d1bc10489bc58961e3732d63863-mem1 TOMCATB
D3866d1bc10489bc58961e3732d63863-mem1 Tomcata
As you can see, in the above verification, although the server changed, but its ID number is unchanged
How to build a memcached server
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