note 103801 added to memcache.addserver

From: Date: Wed, 04 May 2011 13:30:15 +0000
Subject: note 103801 added to memcache.addserver
Groups: php.notes 
Request: Send a blank email to php-notes+get-179404@lists.php.net to get a copy of this message
Actually if you have two memcached servers from which one of them is on localhost, and the other is on a remote machine you can communicate with both even if you specify the loopback address for the local one. <?php $memcache_obj = memcache_connect("127.0.0.1", 11211); memcache_add_server($memcache_obj, "memcache_remote_host"); $memcache_obj->set('var_key', time()); ?> This WILL communicate with both hosts but however there are two aspects that must be taken into account: 1. the communication will be done through different network interfaces with the two hosts. It will use the loopback interface for the "127.0.0.1" host (lo in my case on Linux) and the external interface for the "memcache_remote_host" (eth0 in my case). Only if you want to use the same network interface to communicate with both hosts you must use the external IPs of both machines (and all communication will go out through the eth0 interface). 2. the connection with the two hosts will be established differently because of how memcache_connect() and memcache_add_server() work. Therefore the memcache_connect() will initiate the connection to localhost through the loopback interface when it is called, while memcache_add_server() will just add the second server to the pool, but it will not send any package through the network until it's absolutely needed (for example when a memcache_set() command is issued). ---- Server IP: 69.147.83.197 Probable Submitter: 193.105.64.1 ---- Manual Page -- http://www.php.net/manual/en/memcache.addserver.php Edit -- https://master.php.net/note/edit/103801 Del: integrated -- https://master.php.net/note/delete/103801/integrated Del: useless -- https://master.php.net/note/delete/103801/useless Del: bad code -- https://master.php.net/note/delete/103801/bad+code Del: spam -- https://master.php.net/note/delete/103801/spam Del: non-english -- https://master.php.net/note/delete/103801/non-english Del: in docs -- https://master.php.net/note/delete/103801/in+docs Del: other reasons-- https://master.php.net/note/delete/103801 Reject -- https://master.php.net/note/reject/103801 Search -- https://master.php.net/manage/user-notes.php

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