Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects). It is commonly used as a cache to speed access to frequently used data.

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Max Memcache Sets per second on a given key [duplicate]

Let's assume I have a "counter" I am storing in a Memcached key, Let's say the value is a numeric value ranging from 100000 to 100000000000 (100B). So a key value with 12 characters or less in it. I ...
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31 views

Updating memcached…will the data be flushed?

I know if you restart memcached the data is lost. What about when an update happens? I am not 100% sure even how to do an update, but I think yum will do it automatically and it would be very bad if ...
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What is the right value for memcache.session_redundancy?

The PHP manual for Memcache doesn't have any explanation for the memcache.session_redundancy option. The comment on that page (which is 4 years old) says it sets the number of copies of a session ...
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107 views

Memcached listen on selected interfaces

I am setting up Memcached on a Debian server that has two interfaces - eth0 (public) and eth1 (private). I want Memcached to listen on both eth1 and lo (loopback) so that it can be accessed even if ...
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cannot setup memcached with sasl

I was following http://www.shanison.com/2014/04/29/setup-memcached-with-sasl-authentication/ with memcached SASL setup. I did not install memcached from source because -S worked without any error. I ...
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11 views

PHP sessions in memcache - secure session path

Memcached is fine for sessions as I read. But what safe? Today we have more clients on one server. Every virtual host have own session.path. This is safe to prevent read sessions from other domain. ...
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How Memcached negotiate the protocol? [migrated]

I know that Memcached can negotiate protocol with the client, but I know nothing (neither can found anything on Internet) about the negotiation mechanism the server use. Any idea?
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54 views

memcached works differently on two servers

I have a dev and a testing environment that (ostensibly) are set up the same, but code that works on the dev server doesn't work on the test server. I've narrowed it down to memcached. The dev ...
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1answer
59 views

Memcached keeps increasing cpu ussage

I'm running a memcached server which is serving two front end servers. These are connecting to the memcached server from Apache2/PHP using the standard PECL library. For some reason the memcached on ...
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1answer
169 views

Caching (memcache/redis) and multiple servers - best strategy

We're considering best strategy for using cache (memcache or redis based) in our application (Symfony2). It will be deployed on multiple (so far 3) separate machines with load balancing and separate ...
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61 views

Using memcached in php.ini is ignoring gc_maxlifetime?

Using php-fastcgi with session.save_handler = memcached and session.gc_maxlifetime = 1440, my sessions are never expiring. Memcached Cache is running full and then starting to evict old items after a ...
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52 views

Memcached Service Crashed Every Morning

I have Memcached 1.4.17 Install on CentOS server to serve a PHP website. The problem is every morning the Memcached Service will be crashed. Any suggestions?
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114 views

Save PHP opcache to Memcached

Running on small servers it would make sense offloading these as much as possible for performance. Also offloading will prevent from the server becoming a bottleneck. Therefore I use memcached for ...
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103 views

Adding Memcached (to WordPress) causes PHP (Apache, mod_fcgid) to hang

Quick architecture overview: Nginx serves up static assets and is running as a reverse proxy to PHP (FastCGI, mod_fcgid + Apache). Memcached is running on the same server as well: memcached -d -p ...
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23 views

How to checking remote machine is active or not using tool? [duplicate]

1)Initially I have 5 servers.I am passing one by one server Ip through java code. 2)If machine is InActive then send an email to admin. 3)I need a tool for remote machine is up or down (up means ...
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27 views

Memcached: More items than connections?

I setup memcached for saving (serialized) PHP sessions. So everytime someone visits my site (1-n connections), a session (1 item) gets created. I don't use memcached for anything else yet. Question: ...
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31 views

memcached available, but not installed and unable to uninstall, but run in process

I installed memcached in my cent OS VPS. Somehow it's not work as i expected and now I switched to suPHP. But when I run 'top' command I can see 'memcached' run as a nobody user. 1727 nobody 20 ...
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407 views

PHP-FPM save sessions in memcached

I'm trying to switch my session_handler to memcached, I'm not sure if it worked, it does not look like it did. vi /etc/php5/fpm/php.ini session.save_handler = memcached session.save_path = ...
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2answers
72 views

Wordpress (using varnish + apc + w3tc): Do the statistics get updated when the data is being retrieved from the cache?

If the data is served to the client from the varnish cache, does it still get registered as a hit in the statistics (could be derived from nginx logs or might be google analytics)? I believe if the ...
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87 views

Why is memcache not functioning with elgg in debian 7?

I am moving a php website (built using elgg - www.elgg.org) from a CentOS server to a different Debian 7 server and have installed memcached + php5-memcache on both. I have recreated all the ...
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133 views

Installing ElastiCache Cluster Client on PHP AWS Elastic Beanstalk (without creating resource)

Elastic Beanstalk does not, by default, install the ElastiCache Cluster Client PHP module. This is needed to connect to an ElastiCache node cluster. Reading around, most of the instructions relate to ...
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527 views

Installing memcached deamon on Centos PHP conflicts

I have Centos 5.10 installed on my server and tried running the following command yum install php53u-pecl-memcached.x86_64 Setting up Install Process Resolving Dependencies --> Running transaction ...
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337 views

Intercepting 404 with nginx as reverse proxy for memcached + node.js

I'm using nginx as a reverse proxy to look up html content from memcached, if not present, then node.js, if not even there, node.js returns 404. What I'm trying to do is intercept and deliver a custom ...
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2answers
908 views

nginx does not seem to load memcached module for php

I have an Ubuntu machine with nginx and memcache running, and I'm trying to use PHP with Memcached. I'm getting Fatal error: Class 'Memcached' not found. The ini file is loaded from ...
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135 views

Memcached with SASL: Couldn't find mech PLAIN

I'm trying to get memcached working with SASL. I'm compiling memcached and libevent from source. These are the steps I took (both under root and a user, same result): Having these packages: ...
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294 views

Compiling libmemcached Fails on Centos

I am trying to compile libmemcached on Centos 6.4 with gcc 4.8.2. I've run configure which gives me: Configuration summary for libmemcached version 1.0.17 * Installation prefix: /usr/local ...
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101 views

Memcached is slowing down the website in VirtualBox [closed]

I noticed our web project (Drupal) runs slower when it's using memcached in the virtual box. The page load time is more the twice as fast without memcached. I haven't noticed any unnatural memcached ...
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93 views

how to install php5-memcached in linux?

I've installed memcached server using yum. My server os info - Linux version 3.8.4-x86_64-linode31 (maker@build) (gcc version 4.4.5 (Debian 4.4.5-8) ) #1 SMP Mon Mar 25 16:00:34 EDT 2013 But when ...
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195 views

nginx returning error 502 when get not exist key on memcached

i use nginx 1.2.3(php-fpm) php 5.4.7 pecl memcached 2.1.0 memcached 1.4.15 if memcached service stop or get a not found key,nginx return 502 error and in error_log: 2013/11/19 17:37:04 [error] ...
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119 views

How to ask memcached auth connection by sasl and pam?

I use memcached in a untrust network, so I try to use sasl and pam to auth connection to memcached. I installed sasl and pam module, compiled and installed memcached with sasl enabled. Also I created ...
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253 views

How i can setup a nginx cache strategy that first try amazon s3, then memcache and do a fallback on miss?

i have a large site with lot of pages that almost never change, right now i am using two memcache servers (amazon elasticache), but this its really expensive. Thats why for this files that barely ...
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72 views

4 Magento Requests per second = 210 mbit memcache bandwith?

After searching serverfault for similar questions without success, these are my numbers for one magento instance, running on multiple servers: After varnish about 4 requests per second hit the ...
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68 views

New Relic Memcached plugin installation location - App server or memcached server(s)?

We have the New Relic PHP agent running on our 8 app servers. we have two memcached servers and would like to add the New Relic/ Meet Me Memcached plugin to grab memcached metrics. Should the ...
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3answers
154 views

Memcached - doesn't seem to be working

my local.xml <session_save><![CDATA[files]]></session_save> <cache> <backend>memcached</backend> <prefix>MAGE_</prefix> <memcached> ...
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Unable to load the webpage because the server sent no data - No data received (Page failed to load) [closed]

I have the following server configurations: Service Provider: Rackspace OS: CENTOS 6.4 Web Server: Apache 2 Caching: Memcache & Memcached Server Side Language: PHP Database: MySQL My web ...
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1answer
194 views

Should I install memcached on my Level 3 VPS?

I have a Level 3 VPS Linux server from Hostgator that I pay $50/month for. I know nothing about servers, but I'm aware this isn't the cheapest around, but far from the most expensive. On the domain ...
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1answer
147 views

Memcached inconsistency in values for maxbytes and limit_maxbytes

I'm using Memcached on RHEL/CentOS 5/6 and found that memory size inconsistency between limit_maxbytes and maxbytes taken from "stats" and "stats settings" respectively. I have compiled ...
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1answer
238 views

Right way to configure memcache

I'm trying to change memcache memory size limit in my CentOS env. I've examined other questions and found out there SHOULD be a file, which is mostly under /etc/sysconfig/memcached and if not I should ...
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89 views

Memcache daemon error, how to restart it quickly

i have the memcached daemon failing with the following error: 2013-08-15 07:45:27 +02:00 --- error: Uncaught PHP Error: Memcache::set() [<a href='memcache.set'>memcache.set</a>]: Server ...
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1answer
107 views

Memcached ports and CSF

I've got a small / medium sized VPS powered by WHM and running a few personal websites alongside a Magento powered web-store. Not being a real expert when it comes to server configuration details I've ...
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1answer
83 views

Different memcached instance per user, with authentication

I am writing a script which will allow each and every cPanel user to run an instance of memcached on their own. The script at this point is starting the daemon for every user on a different port. ...
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3answers
2k views

Installing PHP 5.3 Pear on centos 5.8

I just created a VPS with 32 bit Centos 5.8 and installed php53 and a host of other php 5.3 packages. I would like to install memcached using yum but I get the following error Resolving Dependencies ...
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1answer
47 views

memcached number of threads showing more than what were set

I started memcached server using 8 threads. Then I checked threads using ps -eLf | grep memcached shantanu 2758 1 2758 0 10 11:17 ? 00:00:00 memcached -d -l 10.90.15.104 -p 11311 -t 8 ...
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1answer
51 views

Can I have nginx put stuff on memcached?

It is my understanding that nginx can query memcached for data that it serves, but you have to place them there using some other (homegrown) program. So the question is, can I have nginx fetch data ...
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2answers
540 views

Memcached status returning “memcached dead but pid file exists”

When I want to see the status of memcached I run service --status-all but I get this multiple times "memcached dead but pid file exists" when it lists memcached. It seems to me that this means ...
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254 views

How to find max connections used by memcached?

In our LAMP application we have increased the max connection value for memcached to very high to avoid error for max connection we were having. Now we want to set appropriate value to max connections ...
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64 views

Memcached dont start on boot

I've installed the memcached and configured /etc/init.d script. /etc/init.d/memcached: #!/bin/sh # # memcached Startup script for memcached processes # # chkconfig: - 90 10 # description: ...
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2answers
67 views

Can't get Memcached to use more than 300 MB for cache

I installed Memcached on a Debian 7 server with 32 GB of ram. In my /etc/memcached.conf file I have it set up to use up to 4 GB of ram: -m 4000 Yet, whenever I run 'top' I always see memcached using ...
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2answers
170 views

Can memcache invoke a script to reload itself after startup on Ubuntu?

Since memcache stores everything in ram, it will lose its store after a node recovers from failure. Does memcache offer a hook to invoke a script after it starts up? We want that script to do ...
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131 views

Memcached distribution

I have a question about memcached distribution across nodes. We have 20 memcached nodes with 200GB memcached on each. Our apps are PHP apps. $memcache->setOption(Memcached::OPT_DISTRIBUTION, ...