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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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 ...
0
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1answer
81 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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0answers
273 views

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 ...
14
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4answers
4k views

How well do nginx and memcached work together?

We have a Java EE-based web application running on a Glassfish app server cluster. The incoming traffic will mainly be RESTful requests for XML-based representations of our application resources, but ...
0
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1answer
353 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 ...
0
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0answers
124 views

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 ...
1
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1answer
153 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 ...
0
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1answer
102 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 ...
0
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1answer
34 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: ...
3
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1answer
237 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 ...
1
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1answer
891 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 ...
0
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0answers
242 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 ...
0
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1answer
114 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?
3
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1answer
230 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 ...
1
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1answer
1k views

upstream prematurely closed connection while reading response header from upstream, client

I'm using nginx and spawnf-cgi with apc and memcache enabled.I'm getting 502 bad gate way on browser and this error on error log. 2013/01/07 06:55:46 [error] 90799#0: *53 upstream prematurely closed ...
13
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3answers
20k views

How to increase the amount of memory memcache uses?

I am currently on a Xeon 7550 server running Redhat x86_64 es5 with 32gb RAM. I have memcache installed and the only step remaining in the configuration is to set how much memory it uses. I had done ...
7
votes
2answers
3k views

Add vs Set in Memcached

I don't understand the difference between ADD and SET Any clues? It seems as if ADD includes SET or that ADD returns false if something is there and SET just overwrites. Thanks! EDIT: My specific ...
0
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0answers
67 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 ...
0
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1answer
101 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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0answers
146 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 ...
1
vote
1answer
118 views

Should we increase local port range limit on busy memcached servers

nixcraft has a tutorial on configuring memcached server(link) at the end says: For busy memcached server you need to increase system file descriptor and IP port limits here is the code to do ...
1
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1answer
1k 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 ...
0
votes
2answers
3k 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 ...
6
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4answers
4k views

Slow Memcached: Average 10ms memcached `get`

We're using Newrelic to measure our Python/Django application performance. Newrelic is reporting that across our system "Memcached" is taking an average of 12ms to respond to commands. Drilling down ...
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0answers
262 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: ...
0
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2answers
390 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 ...
0
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1answer
190 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 ...
1
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1answer
590 views

Memcached cache doesn't flush

I would like to flush the memcached cache keys and values on my centos server. I have tried the telnet approach by telnetting to the port and then issuing: flush_all It doesn't work an my values are ...
0
votes
2answers
223 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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6answers
2k views

Dividing memcached between sites?

If I end up having 4 or 5 medium sites on one server, I want to be sure that each one that requires memcached has at least an allotted space. Is there a simple way to do this? The only ways that come ...
0
votes
2answers
366 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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0answers
430 views

Memcached and repcached not replicating 2 master servers

I have memcached-1.2.8-repcached-2.2 installed on memcached on centos. They install went great and when i start memcached i get: replication: connect (peer=192.168.1.2:11212) replication: marugoto ...
0
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1answer
379 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 ...
0
votes
1answer
122 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 ...
2
votes
3answers
910 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> ...
3
votes
1answer
130 views

Nginx with Memcached module

I'm running Wordpress website with "W3 Total cache plugin" for Memcached on Nginx. I know that there is a Nginx module available for Memcached and I'm wondering what's the preferred/recommended method ...
9
votes
1answer
24k views

Failed to connect to memcache host !

I'm totally new to memcached ! I sucessfully Installed and started memcached with this command in my host A (Ip 192.168.1.102) memcached -u memcached -d -m 30 -l 127.0.0.1 -p 11211 I also add these ...
0
votes
2answers
853 views

Timeouts somewhere on our stack (haproxy, nginx, rails, memcached)

We have some timeouts that are driving me crazy, under virtually no load (probably a couple people hitting the servers per minute). We use nginx to redirect non-SSL to SSL, terminate the SSL, and ...
2
votes
3answers
700 views

How to maximize parallel download from S3

I got a lot of images to load from Amazon S3 on a single page, and sometimes it takes quite some time to load all the images. I heard that splitting the images to load from different sub-domains would ...
16
votes
4answers
32k views

how to restart/clear memcache without restarting the whole web server?

/opt/eduserver/eduserver gives me options: Usage: /opt/eduserver/eduserver ...
0
votes
1answer
372 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 ...
31
votes
5answers
24k views

Which PHP (opcode) cache one should use and why?

I keep hearing about some PHP (opcode) caches like - APC, XCache, Memcache, eAccelerator, etc. But I couldn't ever figure out how to go about choosing one. Apart from performance benefit, which a ...
0
votes
1answer
793 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 ...
0
votes
0answers
144 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 ...
0
votes
1answer
203 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 ...
1
vote
1answer
155 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. ...
0
votes
3answers
4k 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 ...
14
votes
3answers
3k views

Unexpected(?) high 'wasted' memory in memcached

Updated, see bottom of the longish (sorry) question. Looking at our memcached stats I think I have found an issue I was not aware of before. It seems that we have a strangely high amount of wasted ...
5
votes
2answers
8k views

How to set up memcached to use unix socket?

While I could use memcached on Debian to use the default 11211 port, but I've had great difficulty setting up unix socket, Form what I'v read, I know that I need to create a memcache.socket and add ...
0
votes
1answer
54 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 ...