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

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6
votes
2answers
301 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
31 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 { ...
1
vote
0answers
80 views

Rewrite a url to a a new URL and then send the new URL to a PHP script

I have URLs that contain a cache busting string. I want to rewrite these URLs without the cache busting string, and then send the rewritten URLs that match a certain criteria (e.g. audio/video files) ...
1
vote
1answer
35 views

Number of previous logons to cache - is there any way to override the limit of 50?

The goal is to have over 100 users be able to log into an offline machine using their cached domain credentials. Is there any way to override the limit? Do I have any other options for storing ...
0
votes
0answers
54 views

Disable file content/data cache for NFS?

I'm using NFS to share a directory between host (nfs-serer) and guest (nfs-client) system. I did not want to use KVM's preferred module 9p due to slow transfer speeds - NFS, does yield about twenty ...
0
votes
1answer
239 views

Linux ZFS does not buffer writes to write buffer (SLOG/ZIL)?

When experiencing write I/O, the log column in zpool iostat -v does not show any ZIL activity, ever. This results in higher than expected wait times when writing data to disk (sometimes over 80ms ...
1
vote
1answer
61 views

IIS Output Caching with ISAPI extension

I have an application running in IIS via an ISAPI extension with outputs JSON files based on the input URL (it works with a RESTful interface - the URLs are of the form ...
0
votes
1answer
71 views

mod_expires does not affect caching

I have mod_expires installed in Apache on CentOS VPS. It is also listed in the loaded modules, I checked by this command /usr/local/apache/bin/httpd -l When I place the code in .htaccess, and then ...
1
vote
0answers
135 views

LSA SID cache keeps old entry for renamed domain user - why?

I have a question about LSA SID cache on a domain member server. Recently I run into the issue when some users after their name was changed in AD has difficulties accessing application I support, and ...
1
vote
0answers
28 views

NVA: rewrite before or after Varnish?

I'm planning an NVA server system (Nginx-Varnish-Apache), where request are routed through in that order. Apache would be serving WordPress CMS or similar. I'm wondering where to apply additional ...
0
votes
1answer
19 views

Nginx: Tracking try_files misses

We are using try_files as cache rather than hitting the UWSGI to serve the file. Using a rule like the following: try_files $uri @uwsgi_app; I was wondering what is the best way of logging the ...
0
votes
0answers
128 views

Apache + PHP (fast-cgi) + Wincache on Windows Server crashing

We have one PHP application that runs on Windows Server 2008 Apache 2.2.23 PHP-5.4.27 (FastCGI) Wincache 1.3.4.0 and crashes from time to time and I'm not able to figure out what's going on. ...
0
votes
1answer
131 views

NGiNX Custom Cache param based on regex match

My question(s) are as follows: How do I set custom variables based on regexp against a useragent? How do I set custom headers for the reverse-proxy request? How do I use these values as caching ...
0
votes
1answer
72 views

Force AWS CloudFront to refresh resources from origin without user requests

I'm deploying a CloudFront distribution for a widely distributed network. I'm using my own server as origin and I've configured the cache expiration to a custom value (say 24 hours). Everything works ...
1
vote
1answer
134 views

varnish is caching logged in users pages and serving those pages

I set logged_in cookie when user login. If logged_in cookie exists then varnish will not cache the request. This is my vcl_recv sub vcl_recv { if (req.backend.healthy) { set req.grace = ...
2
votes
3answers
105 views

Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens?

Is a BBU necessary when you have A+B power? Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens and you are forced to do a cold reset?
4
votes
1answer
70 views

Slab usage extremely high?

On a Centos 7 server with 32GB RAM memory I am running a few programs namely MySQL, Apache2, PHP. Recently I wanted to verify the amount of ram left as I was planning on installing a few more ...
1
vote
0answers
21 views

counter for availability of dedicated Azure cache

The following link have a list of Azure caching perf counters : http://msdn.microsoft.com/en-us/library/azure/hh914135.aspx#PerfCountersc2 we are interested in, to get the utilization of the cache ...
1
vote
0answers
72 views

Transparent data caching in multi-site environment

I need an advice on choice of the right technology for my problem. I have geographically distributed multi-site environment where there is one main site and a number of remote sites. Main site ...
0
votes
1answer
285 views

Tomcat 8 org.apache.catalina.webresources.Cache.getResource

I have just upgraded from 7.0.52 to 8.0.14. I am getting this for lots of static image files: org.apache.catalina.webresources.Cache.getResource Unable to add the resource at ...
0
votes
0answers
37 views

website has problems for one person but not for another

My partner and I run 2 websites that I can access fine in all 3 major browsers. He unfortunately can not. He gets "too many redirects" error in Chrome and 404 error in IE but only for the one website. ...
0
votes
0answers
56 views

NGINX: proxy_cache altering headers

I have been having trouble building a proxy between my server and s3 to cache requests. I finally boiled it down to a single point of failure... http{ proxy_cache_path /home/cache levels=1:2 ...
0
votes
1answer
76 views

NGINX and Node.js Caching returning the same results on all subfolders

We use NGINX to proxy a connection to a Node.js instance running on the same server. Without caching turned on for that location, at one level (i.e. /v1/streams/) it returns a 2MB json file. If an ...
1
vote
1answer
87 views

Nginx proxy cache invalidating request to s3

I have set up a proxy from my application server to a private s3 bucket to cache requests. I was having some trouble with it where s3 was rejecting my download requests (403 forbidden) and after some ...
0
votes
1answer
736 views

How to set Nginx ignore Pragma: no-cache

I'm setting up a Nginx server for a cache proxy server. I've noticed that cache not working when this header is in request: Pragma: no-cache Without this header, cache working ok. Can I make ...
0
votes
1answer
131 views

Nginx map cache rules does not work

I have created map rules for Nginx for avoid cache. However it does not works nocache_map.conf (included in http section. map $http_x_requested_with $nocache { default 0; ...
0
votes
0answers
168 views

Caching Docker (Cloudfront) images with Squid

I have a Squid server setup with ssl-bump caching SSL resources used by Docker but I'm having issues trying to get it to cache requests to Cloudfront, for example: 1415056176.733 190419 172.17.0.40 ...
0
votes
0answers
58 views

First steps in distributed cache and application

Background: We provide a client with a single server to which we provide a data dashboard site (ASP.NET/IIS7) feeding multiple MSSQL databases (OS: Windows Server 2012 / SQL: MSSQL 2008R2). One of the ...
0
votes
1answer
796 views

Nginx not processing proxy hide header and proxy ignore headers

I have trouble trying to make Nginx ignore and hide some headers from a proxied server. I want Nginx to hide and ignore "Cache Control" and "Server" headers but it didn't work, I don't know why. My ...
0
votes
1answer
300 views

Nginx: using X-Accel-Expires with Cache-Control

I'm using Nginx as a caching proxy server. I have problems with caching responses using both X-Accel-Expires and Cache-Control headers. My upstream returns some request body with headers to nginx: ...
-1
votes
3answers
6k views

How to flush DNS resolver cache on Linux (and FreeBSD)

I am admin for several Linux and FreeBSD servers and here is a problem I have: The servers run a tool that does a lot of DNS queries every minute for the entire network. When it does a query, the ...
-1
votes
1answer
88 views

Web caching to reduce bandwidth on low speed connections [closed]

On my company we have an ISA Server proxy we use to access internet, this server is managed by external administrators and we do not have access to modify its configurations. Lately we have been ...
2
votes
2answers
173 views

Solaris 10 ZFS ARC Maxed Out and CPU's Overloaded

We've been running ZFS for a couple years now on Solaris 10 on Oracle M5000 Enterprise server with 32 CPU cores and 256GB of memory. We are running a database/application on this server which appears ...
-1
votes
1answer
118 views

Varnish with PHP FastCGI / Change FastCGI server port

I want to run Magento with Varnish Cache. So far my PHP runs as FastCGI. I am now trying to set up Varnish. And have a probably pretty stupid question. So as I understand Varnish will listen on port ...
4
votes
1answer
199 views

Is this a case of a stale ISP DNS cache or did I fudge something up?

I am currently in the process of transferring a legacy website (from a legacy hosting service provider) to a modern solution. Due to my context-specific requirements (which include financial ...
1
vote
0answers
65 views

How cache OpenLDAP Meta database (for use with Websphere Application Server)?

I have configured Meta database directory on OpenLDAP server for two different Active Diretories and it's work. But now I'd like set cache for this OpenLDAP, but I don't know how. From my slapd.conf ...
1
vote
0answers
61 views

Does OPcache work when PHP is running in CGI mode?

Does PHP 5.5s OPcache work with PHP running in CGI mode? Or does that even make sense, since it forks and kills PHP for each request?
-1
votes
1answer
129 views

Debug Nginx caching

I want to determine when I am getting cache hits or misses. Preferably, this would be a header, like X-Cache: HIT or X-Cache: MISS How can I do this with Nginx (a reverse proxy for the upstream ...
-1
votes
1answer
67 views

Does Nginx respect maxage from upstream server?

I see the proxy_cache_valid directive, but that confuses me. In HTTP, doesn't the upstream server specify this with Cache-Control and maxage? How do I get Nginx's cache to use maxage ?
1
vote
0answers
78 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 ...
0
votes
0answers
25 views

Unexplained hostname on IIS on Test Server

The test environment is IIS/Windows Server 2008/ColdFusion10 My development environment is Apache2/Ubuntu14/ColdFusion10 Other developer uses ONLY IP Address to test the hosted website on the ...
1
vote
1answer
1k views

Nginx not caching data

I have a REST API behind an nginx proxy. Proxying works fine, however I am unable to cache any responses. Any help would be much appreciated: Nginx config: worker_processes 10; error_log ...
3
votes
2answers
632 views

Why does Apache send 200 OK while Last-modified matches If-modified-since?

I'm trying to have a basic behavior regarding my caching strategy: files should be cached, and revalidated with server each time. So I would like Apache to send a 304 back. Here is the dialog that ...
0
votes
1answer
83 views

Memory cache is full not sure what is using it and if it is normal [duplicate]

The situation is that amazon bots are download ~600k images off my server. My web app deployed on apache server is extremely slow probably because ram usage is 100% some statistics: ...
0
votes
1answer
26 views

Varnish 3 ignore the req.backend directive

Varnish3 is ignoring the req.backend directive. As explained on the documentation (here), I've set two backends, and the regex for redirecting the request to the correct one. By the way, seems liks ...
0
votes
1answer
118 views

Varnish cache with NGINX files not updating WordPress

It seems that Varnish is missing or not validating cache properly. When I try and purge my cache, I get 200 OK Cache successfully cleared, but my page does not update. I am simply making HTML changes ...
1
vote
1answer
47 views

Memcached Pool - Outtage causes increased lag in response time

I have multiple cache servers which are added to a virtual pool at the PHP layer via the Memcached::addServers() api. During fault tolerance testing I noticed that taking one of the memcached servers ...
1
vote
1answer
89 views

Varnish does not purge my requests sent by Plone

I have varnish 3.0.5 up and running, connecting to a Plone 4 backend. My requests are cached, but not purged reliably, actually only after expiration of the ttl. plone.app.caching is the addon, which ...
0
votes
1answer
85 views

How to read apache header in NGINX?

I've set up nginx to bypass ajax requests (wich have header): set $accel "0"; if ($http_x_requested_with) { set $accel "1"; } proxy_cache_bypass $accel; It works fine, but I want be able ...
0
votes
0answers
82 views

How can I configure Apache so clients cache images but still check for updates?

I'd like to set up an Apache vhost such that browsers will cache images locally but will check back against the server for updates each time prior to displaying images. I have this currently: ...