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PHP sessions not stored in memcache

Running an application using php 5.4 on AWS using Amazon Linux.

The PHP version is PHP 5.4.28. memcache lib installed from the AWS repository - php54-pecl-memcache-3.0.8-1.11.amzn1.x86_64

I checked that php uses /etc/php.ini:

[ root@ip-xx.xx.xx.xx ]# php -i | grep Config Configuration File (php.ini) Path => /etc Loaded Configuration File => /etc/php.ini

The parameter shows that I should use memcache:

 [ root@ip-10-40-17-119 etc]# grep "^session.save" php.ini session.save_handler="memcache" session.save_path="tcp://<elasticache-endpoint>:11211" [ root@ip-10-40-17-119 php.d]# php -i | grep session.save session.save_handler => memcache => memcache session.save_path => tcp://<elasicache-endpoint>:11211?persistent=1&weight=1&timeout=1&retry_interval=15 => tcp://<elasticache-endpoint>:11211?persistent=1&weight=1&timeout=1&retry_interval=15

I can install telnet from the box to the endpoint and port and connect correctly so that the instance can connect to the memcached server.

What we tried:

  • I deleted tcp: // from the php.ini file, and it didn’t matter - the sessions are still stored in the files.
  • We changed from session.save_handler = "memcache" to session.save_handler = "memcached"
  • every time we make changes, we stop the httpd server and then start it again
  • we even tried to restart the servers

No matter what we tried, the sessions are stored on disk in / var / lib / php / sessions. Is there something I'm missing, or is this a known issue of 5.4 or AWS?

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2 answers

OK, we managed to find out the problem.

First, we created a simple page that spits out phpinfo (). Please note that it is important that you run this through a web server - running php -i does NOT include any overrides that apache can add.

In the session section, the output lists all the directives, as well as the Local value and Main value.

Local values ​​had:

 session.save_handler files session.save_path /var/lib/php/session

while the main values ​​were:

 session.save_handler memcache session.save_path tcp://<endpoint>:11211

It turns out that by default, the /etc/httpd/conf.d/php.conf file specifies an override that defines files. This is similar to the Redhat / CentOS / Fedora thing.

Removing these values ​​from php.conf fixes the problem.

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Both major PHP PECL memcache extensions have session handlers. Or you will need to install the PECL module before use.

Memcache The PECL extension session handler is included in php.ini:

 session.save_handler = "memcache" session.save_path = "tcp://memcacheServerAddressHere:11211?persistent=1&weight=2&timeout=2&retry_interval=10"

Memcached PECL extension session handler is included in php.ini:

 session.save_handler = "memcached" session.save_path = "memcacheServerAddressHere:11211"

Note that the Memcache extension appears to allow more configuration of the Memcache environment.

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