sharing php sessions between web servers using NFS
Posted: Sat Jun 20, 2009 12:37 am
Hello,
I have three web servers (in a lvs cluster)
in the cluster they all think they are http://www.mydomain.com
With LVS you can not guarantee that each request is going to come in via the same server
I am trying to share php sessions between servers.
I have seen some examples that use mysql for session, but i think this may work
and would be easier to implement
currently all three servers share the same file system via NFS
so what i was going to do is change the path in the php.ini to
session.save_path = "/mynfsmount/phpsessions". So essentially all three servers would write the session files in the same location.
my concern is does anyone know how php creates the session ID
the thing that concerns me is that i compared the current session directories on the 3 servers and there are duplicate file names. Do you think i can assume that PHP checks for the existence of the session file before it creates a new PHPSESSIONID??
the one thing that would be ugly is if the servers overwrote the others files and sessions started getting messed up.
Thanks for your help
I have three web servers (in a lvs cluster)
in the cluster they all think they are http://www.mydomain.com
With LVS you can not guarantee that each request is going to come in via the same server
I am trying to share php sessions between servers.
I have seen some examples that use mysql for session, but i think this may work
and would be easier to implement
currently all three servers share the same file system via NFS
so what i was going to do is change the path in the php.ini to
session.save_path = "/mynfsmount/phpsessions". So essentially all three servers would write the session files in the same location.
my concern is does anyone know how php creates the session ID
the thing that concerns me is that i compared the current session directories on the 3 servers and there are duplicate file names. Do you think i can assume that PHP checks for the existence of the session file before it creates a new PHPSESSIONID??
the one thing that would be ugly is if the servers overwrote the others files and sessions started getting messed up.
Thanks for your help