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PHP web clusters and session information
by markw-4
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Are there any admins/architects that have multiple web servers using PHP
and are sharing sessions. I have an open source project I've been trying to get going for a while now and I'd like to solve the major issues for this type of deployment. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: PHP web clusters and session information
by markw-4
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> On Wed, May 14, 2008 at 11:39 AM, <markw@...> wrote:
>> Are there any admins/architects that have multiple web servers using PHP >> and are sharing sessions. >> >> I have an open source project I've been trying to get going for a while >> now and I'd like to solve the major issues for this type of deployment. >> >> -- >> This message has been scanned for viruses and >> dangerous content by MailScanner, and is >> believed to be clean. >> > > Yes, you have two options. Either use file sessions and store the > sessions on one of the servers and mount that directory via nfs to the > other servers. But I recommend against this. Or re-write your code > to store the sessions in the database, that way no matter what > database you hit, you'll be pulling the session data from the db. > > There are tons of PHP examples out there of how to write your own db > sessions using session_set_save_handler > http://us2.php.net/manual/en/function.session-set-save-handler.php Or > what I did was to use PEAR::Http_Session2 > http://pear.php.net/packages.php?catpid=11&catname=HTTP Well, as an introduction, I have a small session server system that implements locking, session caching, etc. I have been using it on my web sites for close to a decade now and the interface extension used to be part of the PHP general distribution. Tell me what you think about this: http://www.mohawksoft.org/?q=node/36 > > > -- > -matt > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: PHP web clusters and session information
by Matt Shields
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On Wed, May 14, 2008 at 11:39 AM, <markw@...> wrote:
> Are there any admins/architects that have multiple web servers using PHP > and are sharing sessions. > > I have an open source project I've been trying to get going for a while > now and I'd like to solve the major issues for this type of deployment. > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > Yes, you have two options. Either use file sessions and store the sessions on one of the servers and mount that directory via nfs to the other servers. But I recommend against this. Or re-write your code to store the sessions in the database, that way no matter what database you hit, you'll be pulling the session data from the db. There are tons of PHP examples out there of how to write your own db sessions using session_set_save_handler http://us2.php.net/manual/en/function.session-set-save-handler.php Or what I did was to use PEAR::Http_Session2 http://pear.php.net/packages.php?catpid=11&catname=HTTP -- -matt -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: PHP web clusters and session information
by ref-2
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we have three front end web servers that serve millions of pages a month via apache2/php5, and use an NFS server to hold all session information. We had to do this as the front end servers are behind an SNMP balanced bigIP loadbalancer. we did some tests first and for us it proved faster to get the flat files from NFS than to get the session data from a shared DB (though I must add that the NFS mounted server is ALSO the DB server, so it was actually a good test). Richard On Wed, 2008-05-14 at 11:39 -0400, markw@... wrote: > Are there any admins/architects that have multiple web servers using PHP > and are sharing sessions. > > I have an open source project I've been trying to get going for a while > now and I'd like to solve the major issues for this type of deployment. > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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Re: PHP web clusters and session information
by cmarko
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I concur with Richard that the simplest method I have found is to simply
change session.save_path in your php.ini file to an NFS mount. In my own benchmarks, under a moderate simulated web load with hosts mounted against the NFS share this performed much better than when trying to use a rather simple method of storing it in a MySQL back-end (there is of course a lot of room for optimization on the later which I did not consider at the time as was looking for simplicity). This seemed to peak at around 6 concurrent web hosts against the NFS mount point, though I only had 7 physical hosts to play with and so don't have insight into the drop-off beyond 7. I can probably dig out my project paper detailing the specs under this testing if you think it might be of benefit to you. In theory if you used iSCSI on the back-end for the shared storage with a clustered file system (I am thinking GFS, as I don't believe OCFS is designed to perform well with the way PHP stores the session files) you could scale this well beyond 6 hosts without suffering any performance degradation. If you have the luxury of a BigIP, then you can start to do clever things such as using embedded cookies to leverage sticky sessions in pinning someone to a specific host in the cluster, etc. Of course the expense of such puts out of reach of most open source projects and hobbyists. Best of luck! Chris On Wed, 14 May 2008 17:46:11 -0400, ref <tbs@...> wrote: > > we have three front end web servers that serve millions of pages a month > via apache2/php5, and > use an NFS server to hold all session information. We had to do this as > the > front end servers are behind an SNMP balanced bigIP loadbalancer. we did > some tests > first and for us it proved faster to get the flat files from NFS than to > get the > session data from a shared DB (though I must add that the NFS mounted > server is > ALSO the DB server, so it was actually a good test). > > Richard > > > > On Wed, 2008-05-14 at 11:39 -0400, markw@... wrote: >> Are there any admins/architects that have multiple web servers using PHP >> and are sharing sessions. >> >> I have an open source project I've been trying to get going for a while >> now and I'd like to solve the major issues for this type of deployment. >> > > > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ Discuss mailing list Discuss@... http://lists.blu.org/mailman/listinfo/discuss |
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