A location or process for storing of transitory or temporary data in order to improve application or system performance.

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0
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1answer
911 views

htcacheclean doesn't seem to be cleaning the cache

I'm running mod_cache with apache 2 on a fairly high traffic'd site. I've set the htcacheclean to run in demon mode every 10 minutes to keep the cache at 4GB. It's currently at 15GB and doesn't seem ...
3
votes
1answer
62 views

Why does TTL sometimes re-increment between DNS queries?

I dig xkcd.com, and I get something like this back: ; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> xkcd.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: ...
0
votes
0answers
4 views

Cloudfront objects being ejected from edge locations too early?

Cloudfront does not guarantee that it will hold an object in it's edge locations for any duration, however, typically, if I set a Cache-Control:public, max-age=31550000, smax-age=31550000 or a ...
1
vote
0answers
18 views

Is it a good idea to use long max-age and changing urls instead of normal caching approaches [on hold]

I'm trying to improve the speed of some websites that I'm serving by setting appropriate caching headers. I've read in some tutorials that it is not a bad idea to have the URI of assets reflect their ...
1
vote
1answer
323 views

List of hosts in Varnish

I'm running a VPS with multiple different websites, and Varnish in front for caching. However, some websites should not be cached. Instead of making individual rules for each website, I would like ...
2
votes
1answer
47 views

Nginx cache not updating

So my coworker set us up a fancy new caching proxy system and then promptly went on vacation. Now I'm getting complaints from our developers/designers that many static resources are being cached for ...
1
vote
1answer
23 views

Joomla behind caching server with SSL

I'm having trouble getting a cache system to work with Joomla 3.x. This is especially a problem since the server should enforce HTTPS/TLS-connections. The Joomla system runs on Apache2 on Debian ...
0
votes
1answer
471 views

PHP APC not working

I just installed APC with PHP Handler FastCGI. But it seems the Cache never working. if(($t=apc_fetch('key_4321'))===FALSE){ $t=time(); apc_add('key_4321', $t, 24*60*60); } echo $t; Almost ...
0
votes
2answers
426 views

Wordpress feed does not update after APC and Cloudflare

I am running a Wordpress site on a Ubuntu server. I installed APC and setup Cloudflare. After that I started having a strange problem with the feed. When I check the feed on the browser, I can see ...
0
votes
2answers
326 views

Can zend opcode cache and APC cache run together on same server?

I am on a dedicated server - running multiple portals in respective virtual directories. Some of the previously loaded websites are using Zend opcode cache. While my new commerce portal uses an APC ...
-1
votes
2answers
1k views

PHP Warning: Module 'apc' already loaded in Unknown on line 0

I am on a dedicated server with my site hosted in a virtual directory. There are few other sites hosted in different virtual directories. I have APC and APCu installed. When i restart PHP-FPM i get ...
1
vote
0answers
184 views

Data Cache (XCache, APC, memcached, etc) on shared hosting / privacy considerations

I have one question. How appropriate is to use on shared hosting a cache system for data? I mean as far as I know the data is written in a shared data cache (not private for each user) across all ...
1
vote
0answers
50 views

Enabling APC cache takes down website

I have a VPS running on centos 5 with 2 GB ram. I run a IP.Board forum on that server. Recently my server was hacked and I had to format the disk and start again. I was using APC cache before and it ...
1
vote
1answer
2k views

PHP-APC is exceeding limit apc.shm_size often

I am implementing the apc on a shared server that currently has 1000 sites (using wordpress, moodle, etc.). I'm Looking for the admin page, and I see "Cache full count" is growing rapidly. I've tried ...
2
votes
1answer
386 views

Nginx Subdomain Wordpress Rewrite Rules - APC FPC - Slow as a turtle. why?

Running on Ubunty 10.04 Nginx (one of latest) with Wordpress subdomain multisite using the plugin. APC i have latest version same with php, I am running 4 websites with almost no traffic (30 hits ...
0
votes
2answers
925 views

Web server hits from Akamai IP addresses

I am getting a lot of hits to my web server from multiple IP addresses that are owned by Akamai. This stood out to me as the requests are for resources that are no longer available. These resources ...
5
votes
3answers
5k views

Akamai NetStorage vs. Akamai edge service

What's the difference between using Akamai NetStorage vs. Akamai's Edge Service? Below are the concepts that I believe differentiate them but I'd like more details from more experienced people. ...
5
votes
3answers
3k views

Akamai vs smaller CDN for small/medium-size ecommerce traffic? (caching, latency, NetStorage)

The small/medium sized online retail company I work for uses Akamai as our CDN for static images, but I'm wondering whether it might be hurting rather than helping and, if it's suboptimal, what we ...
0
votes
1answer
586 views

Cachefilesd (cachefiles) everything seems to be set up, still not working

I'm trying to set up cachefilesd to work with my network folder shared using NFS. I have seemingly everything set up, however cachefilesd starts normally, however caching isn't functioning. Here is ...
0
votes
1answer
22 views

Nginx Cache with PHP-FPM

I have the folowing niginx config file: server { listen 80; server_name pajilleros.com www.pajilleros.com; access_log off; location / { root ...
0
votes
0answers
14 views

Reverse proxy caching software, what to use? [closed]

I have LAMP installed on my servers. I was just wondering what reverse proxy or caching software do I have to use in order to improve the memory usage of Apache, PHP and MySQL? I have tried nginx yet ...
6
votes
4answers
6k views

What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?

Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power ...
0
votes
0answers
12 views

Python libraries slow to load from NFS mount point

Several of our computers are diskless, and they load their Python libraries from an NFS mount point across the network. This means it can take up to three minutes to start up a Python process that ...
0
votes
0answers
33 views

Accidentally set expires max in http block

Yesterday, I accidentally set max expires option in http block. What should I do to clear client cache ? I'm using nginx as a reverse proxy for my rails server (unicorn), rails has a asset digest at ...
0
votes
2answers
11 views

HyperDuo Not Caching

I have purchased a SATA Controller featuring Marvell HyperDuo. However for some reason I am unable to select the ProgramData folder for Caching. I cannot find any references as to why and have not ...
3
votes
1answer
3k views

Error headers: ap_headers_output_filter() after putting cache header in htaccess file

Receiving error: [debug] mod_headers.c(663): headers: ap_headers_output_filter() after I included this within the htaccess file: # 6 DAYS <FilesMatch ...
2
votes
1answer
32 views

Nginx doesn't decrement max-age

I'm trying to set up Nginx as a reverse proxy for my Rails application running on Unicorn. My app has some public pages that I'd like to cache for a duration for 60 minutes, so I set the max-age ...
1
vote
1answer
2k views

VCL - configuration for Magento and Varnish 3.0.2

I would like to kindly ask if there's someone who can help me configure Varnish for Magento to reach far more hits. My current ratio from varnishstat is: cache_hit=271 cache_miss=926 I'm kindly ...
3
votes
2answers
4k views

Squid refresh_pattern won't cache “Expires: …”

Background I frequent the OpenGL ES documentation site at http://www.khronos.org/opengles/sdk/1.1/docs/man/. Even though the content is completely static, it seems to force a reload on every single ...
0
votes
1answer
1k views

Nginx proxy cache (proxy_pass $request_uri;)

I need to create proxy web using nginx. If I access http://myweb.com/http://www.target.com/ the proxy_pass should be http://www.target.com/ Here is my configuration: location / { proxy_pass ...
52
votes
11answers
9k views

Why drop caches in Linux?

In our servers we have a habit of dropping caches at midnight. sync; echo 3 > /proc/sys/vm/drop_caches When I run the code it seems to free up lots of RAM, but do I really need to do that. ...
8
votes
3answers
29k views

How do I disable tomcat caching? I'm having weird static file problems

How do I prevent tomcat from caching? I have css and basic html files that I load and use via ajax, and unless I restart tomcat, the changes do not seem to reflect. Different machines, different ...
0
votes
0answers
46 views

Is it really possible to use PHP sessions for authentication with nginx fastcgi cache?

I have recently switched an opencart instance from Apache+mod_php to nginx+fastcgi+php-fpm. I have been trying to leverage caching for most pages through fastcgi-cache. Unfortunately, many users ...
0
votes
0answers
14 views

Cloudflare doesn't cache as expected

I'm wondering why Cloulflare would not cache a certain static js file. Given the reuqest: curl -I http://www.testlifeinuk.com/dist/lifeinuk.js the headers returned like: HTTP/1.1 200 OK Date: ...
0
votes
1answer
1k views

Cache Control Headers with IIS 7.5

I'm trying to wrap my head around client side (web browser) caching and how it works in relation to IIS 7.5 cache control headers. In particular: If we want to force clients to reload cached ...
0
votes
1answer
2k views

setting Expires date in iis6

i try to control my iis6 caching i was able to set Cache-Control public, max-age=1000000 but i can't set the Expires any help?
0
votes
0answers
17 views

Squid Cache.Log Anomality?

I have a cache.log full of forwarding loops like below. And this data fills my disk so rapidly. When I kicked the user 10.4.1.111 the logs stopped. What can be the reason? Host: 10.4.1.1:3128 Via: ...
1
vote
0answers
25 views

Script to verify/monitior HTTP caching headers [closed]

We'd like to verify that all our websites use the correct HTTP caching headers. Is there a script out there to make a request to a website, check its response headers and report whether it will be ...
1
vote
2answers
1k views

Squid not caching static content

By looking to Squid3 logs, I've found that Squid it's not caching static resources, for example: 1379041607.923 611 127.0.0.1 TCP_MISS/304 356 GET ...
3
votes
1answer
924 views

flashcache with mdadm and LVM

I am having trouble setting up flashcache on a system with LVM and mdadm, I suspect I am either just missing an obvious step or getting some mapping wrong and hoped someone could point me in the right ...
2
votes
1answer
3k views

Clearing Java certificates cache (force reload certificates)

A simple question here. One application gave me this exception when trying to access a website with a expired certificate: java.security.cert.CertificateExpiredException So, I renewed the ...
0
votes
0answers
5 views

Does WD My Cloud Android app cache photos and videos to the local device? [migrated]

The WD My Cloud Android app describes itself as "free up space on your mobile devices with direct photo and video uploads". If I have photos on my My Cloud, and I use the app to view them on my ...
2
votes
1answer
823 views

Nginx, memcached and cakephp: memcached module always misses cache

I've got a simple nginx configuration; server{ servername localhost; root /var/www/webroot; location / { set_md5 $memcached_key $uri; index index.php index.html; try_files $uri ...
-2
votes
1answer
47 views

Clearing Memory (RAM) Cache on CentOS

I know this has been asked in a similar way in the past but I'm just curious. If I made a script and made it run every midnight to check if my memory usage was higher than let's say, 80... would it ...
2
votes
5answers
3k views

Downloads pause and time out frequently

I'm a new systems and network admin. My experience has been in the hardware and software of systems and servers, the network part is pretty new to me. I'm familiar with plugging numbers into network ...
2
votes
0answers
35 views

400 bad request from a proxy cache

So we have an nginx proxy cache that is used to maintain uptime even if npm goes down. On occasion this server (noticeably once every few months) starts returning 400 bad request for every response ...
1
vote
2answers
8k views

Clear/Remove Exchange 2010 Outlook Web Access (OWA) Cached/AutoComplete Addresses

Does anyone know how to clear the autocomplete/cached addresses from a users mailbox in Exchange 2010 OWA? I've cleared the address from the N2K cache on their local machine, but it still shows via ...
3
votes
3answers
17k views

How can I clear the “authentication cache” in Windows 7 to a password protected samba share?

I have a Linux samba server and have explicitly listed users that can access the folder. I have successfully congfigured Samba to require a username and password when accessing the share from windows ...
6
votes
2answers
261 views

What effect does https traffic have on web cache proxy servers?

I just took two university courses on computer security and internet programming. I was thinking about this the other day: Web cache proxy servers cache popular content from servers on the web. This ...
2
votes
0answers
28 views

Do we get a access.log entry for content served from cache in nginx

For a configuration that looks like http { proxy_cache_path /etc/nginx/cache keys_zone=one:10m; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; server { ...