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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481 views

PHP Session Storage in Fault Tolerant Memcached Pool

I recently had the opportunity to move a web application from using a Nginx proxy "loadbalancer" to an F5 loadbalancer. Unfortunately during that migration it became clear that the memcached session ...
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234 views

CouchBase Client Fails to Cache Object less than 20mb. Time Out Error

I am caching my serialized POJO s(4mb-8mb size objects) concurrently into Couchbase server with CouchBase client (couchbase-client-1.4.3). for(upto 20 itertarions){ new Thread().start().. ...
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1answer
166 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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1answer
189 views

memcache and memcached session not persisting

so I am having a problem with sessions persisting in an application, that is using the memcached php driver, while another existing application is using the memcache driver. On the server, I see both ...
3
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1answer
2k views

How to replicate Memcache data among servers

A same question in SO can be found from here . But since I couldn't find any suitable answer, I am asking with additional info. I have many memcache clients but all of them access one memcache server ...
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2answers
184 views

Nginx and its caching systems. Are they all the same?

I'm a bit confuse about PageSpeed, Microcaching and Memcached. Are they just different tools that do the same job? I was initially thinking in use PageSpeed with Nginx. If I do that, do I need ...
0
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2answers
783 views

Apache Server with memcache, varnish and php slow request times

My issue is that these servers are taking rather long for request about 2 seconds on average just to serve files. When we had just one server doing everything it was noticeably faster even with the ...
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0answers
150 views

Memcached problems since upgrade from Ubuntu 12.04 to 14.04

I recently migrated to Ubuntu 14.04 with a Webprojekt (nginx,PHP5,MariaDB,memcached). All configs are exactly the same. But the cached sites sometimes don't load properly. I enabled the verbose mode ...
4
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2answers
2k 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 ...
0
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1answer
94 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
291 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 ...
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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
394 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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1answer
168 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
126 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
37 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: ...
4
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1answer
364 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
1k 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
294 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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1answer
122 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
254 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 ...
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3answers
22k 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 ...
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2answers
4k 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 ...
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0answers
73 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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1answer
109 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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159 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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1answer
125 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 ...
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1answer
2k 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
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
votes
4answers
5k 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
283 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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2answers
420 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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1answer
220 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
vote
1answer
690 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
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2answers
265 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
413 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
471 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
413 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
127 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
1k 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
136 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 ...
10
votes
1answer
26k 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 ...
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2answers
878 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
759 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 ...
17
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4answers
38k views

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

/opt/eduserver/eduserver gives me options: Usage: /opt/eduserver/eduserver ...
0
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1answer
426 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 ...
32
votes
5answers
26k 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
920 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 ...