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

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2
votes
0answers
286 views

Using database for storing text files and images [closed]

I need to build a image/static file cache which would host maybe few hundred up to thousand static files from 1kb to ~200kb. I'd need super fast reads (I'm using redis, but it's one threaded and I'm ...
2
votes
1answer
159 views

Tool for linux file system cache inspection [closed]

I'm looking for a tool to show what portion of a file is in the file system cache. In the past I have used the fincore tool that is part of the linux-ftools package. linux-ftools isn't in any of the ...
0
votes
1answer
215 views

in-memory-cache of specific files from NFS

I have some diskless machines and they mount a disk through NFS4. I want the machines to maintain a cache of specific files in their own memory. The machines don't modify the files and only read them ...
2
votes
1answer
534 views

Nginx reverse proxy in nested locations

I'm using Nginx as a reverse proxy for multiple applications in multiple servers and I'm trying to add common cache directives to static files of each application. My original configuration is ...
0
votes
0answers
121 views

Enable cache headers on Nginx

I'm trying to make cache work on a Nginx which is a proxy for gunicorn or which serves directly static files. I tried to add: location ~* \.(?:ico|css|js|gif|jpe?g|png)$ { root /home/...
6
votes
0answers
148 views

Is there disk based file system with dedicated memory caching for Linux? [closed]

We have two (or more sometimes) applications battling for the OS page cache. In particular ElasticSearch is very dependent on the OS page cache. To the point that cache misses can make or break ...
1
vote
3answers
2k views

Caching OpenLDAP credentials for offline use on laptops

Our clients (Ubuntu 14.04) can login with there LDAP login. As soon as they have no network they cannot login with LDAP. Is there a way to cache those passwords and usernames, so that the laptops ...
0
votes
1answer
46 views

Is it possible to make nginx cache expires at certain time?

So basically what I want to do is make nginx's cache expires at 24:00 everyday. I know I could use tools like nginx-cache-purge or just manually delete cache files on disk, but I prefer to letting ...
5
votes
1answer
501 views

Linux: What application is using my ram cache

I am wondering if I can see which application is using my ram buffer and cache. Also is there any time specified in kernel, when data is dropped from cache. My Ram is being full used by buffer and ...
-1
votes
1answer
112 views

Control files fetched from upstream when using nginx proxy cache

we have a file sharing site in a local network and we trying to save links bandwidth usage to the max by caching static files in local nodes powered by nginx with caching enabled. Everything works ...
0
votes
2answers
248 views

How would using caching nginx template affect adsense?

I'm considering using the nginx template below for WP sites with adsense on them. Would that cache the adsense ads too and make the clicks invalid? server { listen %ip%:%proxy_port%; server_name ...
0
votes
1answer
167 views

If two videos with the same source stream at the same time will they have separate cache files?

I was resolving an issue on StackOverflow (see my answer too), where I might stream the same video on the same webpage in two separate video elements. I don't really understand web file caching very ...
1
vote
0answers
26 views

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

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 ...
0
votes
1answer
162 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 /home/website/...
3
votes
1answer
189 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
74 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
77 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 ...
2
votes
1answer
522 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 ...
2
votes
1answer
162 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
354 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 ...
2
votes
0answers
1k 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 ...
2
votes
2answers
2k 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: Mon,...
1
vote
0answers
38 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 ...
0
votes
1answer
247 views

Errors when enabling zend_opcache on php-fpm with apache 2.4 proxy

I'm setting up a webserver to host several small sites (mostly wordpress) by putting together php-fpm 5.5.9 and apache 2.4.10 on ubuntu. After reading a good amount of tutorials and post, I decided ...
-2
votes
1answer
2k 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
0answers
420 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 ...
8
votes
2answers
1k 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
71 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
163 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
83 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 ...
1
vote
1answer
1k 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
269 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 http://domain/path/to/resource....
0
votes
1answer
527 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 ...
4
votes
0answers
1k 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
84 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
41 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
1answer
487 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
436 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
558 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
308 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
410 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 programs,...
1
vote
0answers
22 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
148 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 ...
2
votes
1answer
4k 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 [/base/1325/WA6144-...
0
votes
0answers
94 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
292 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
152 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
4k 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 ...
1
vote
1answer
427 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; ...
1
vote
0answers
352 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 ...