Questions tagged [cache]
A location or process for storing of transitory or temporary data in order to improve application or system performance.
400
questions with no upvoted or accepted answers
6
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2
answers
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views
OpenLDAP proxy cache not retrieving entries
I need to set up a local LDAP proxy cache which connects to our central Active Directory server. OpenLDAP Proxy Cache looks just like the thing. But following the manpages as closely as possible, I am ...
5
votes
0
answers
1k
views
Client-side caching when using CSP with nonces in nginx - how do you use weak caching validators/etags?
I'm using nginx's expires directive; its etag directive as well as the Last-Modified header (if I understand correctly) are on by default.
In order to allow specific inline JavaScripts when using ...
4
votes
0
answers
780
views
Copy nginx cache between two servers
I have a nginx caching server with at least 2tb of cache files at any moment, i need to migrate this server to another hosting provider but none of my clients can handle that traffic without cache.
...
4
votes
0
answers
441
views
REQUEST CACHING IN NGINX
I am trying to cache my requests in nginx. I have connected my django server as upstream. Now, I am trying to cache my requests.
proxy_cache_path /var/cache/nginx/ keys_zone=one:10m;
location / {
...
4
votes
1
answer
2k
views
Linux - Disk / Filesystem as a LRU Cache (with transparent expiry)
I have a case where I'd want to use local disk as a LRU cache for (hot) files from a separate web service (something like S3). If the file doesn't exist on disk, the file is read over the internet, ...
4
votes
0
answers
550
views
slabtop command doesn't work
I've inherited Sys Admin duties on webserver and I'm a bit of out my element, but learning as I go. My newest issue is all the of the ram has been gobbled up and I'm not sure where it has gone.
free -...
4
votes
0
answers
2k
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 ...
4
votes
0
answers
5k
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 ...
4
votes
2
answers
1k
views
Caching DNS server returns invalid ip address for external lookups
I'm trying to resolve a DNS issue and am running short of ideas. Google doesn't seem to be helping, either.
When I use my local caching name server to resolve external host names, it always returns ...
4
votes
0
answers
1k
views
How do I clear cached SSL state data from schannel?
I'm trying to clear SSL state data for a normal TLS session (no client certs are involved) for Outlook when connecting to a SSL based CAS server.
How do I clear the SSL state of SChannel?
Does the ...
3
votes
0
answers
340
views
Why does Nginx's new files' permissions supersede my default ACL
I have issues setting up proper permission on cache directory on a site that run on Debian 10 with Nginx and php-fpm.
I have an user 'myuser' which home is /var/www/mydomain.tld
The strucure of the ...
3
votes
1
answer
2k
views
NGINX max_size and keys_zone, could not allocate node in cache keys zone
We have a very dynamic and high-traffic application and are using NGINX caching with dynamic URLS. We want to cache these URLs for repeated requests.
We have run into an issue a couple times while ...
3
votes
0
answers
265
views
Don't cache small responses with nginx
I am using nginx for reverse proxy with caching. And I have a backend that sometimes returns 200 HTTP code for failed requests, with just an empty set for a body. I'd like to configure nginx in a way ...
3
votes
0
answers
598
views
PrivateBytesLimit in web.config doesn't change cache EffectivePrivateBytesLimit
Our web-server has a worker process (w3wp.exe) that uses too much memory. Following this answer I tried to limit how much memory the process can use for caching in the web.config:
<system.web>
...
3
votes
0
answers
476
views
Create a public Windows 10 P2P update cache?
I work for a PK-12 public school district in the USA, in a very rural area with a large number of low-income families, and where many rural families only have 0.5 to 1.5 megabit DSL. In some cases ...
3
votes
0
answers
1k
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How can I ensure that Nginx will never cache certain error statuses?
I have been noticing some 406 statuses being cached in my Nginx proxy instance, and I want to be sure that this does not happen again.
I discovered one possible cause is that somebody had set a ...
3
votes
0
answers
1k
views
Which are possible hierarchies for bcache, mdadm RAID and LVM?
Assuming I want to use bcache for caching, mdadm for RAID (1) and LVM for partitioning (and that I don't care that there might be performance drawbacks due to many levels of I/O and device management ...
3
votes
0
answers
377
views
lvm PV on top of dm-cache
I am running a private cloud (opennebula, KVM) where I am running VMs both directly using LVM Logical Volumes and using disk images on a file system (one is faster, the other is easier to migrate), ...
3
votes
0
answers
854
views
Varnish cache objects expiring while in stale-while-revalidate grace period
I have added Varnish 4.0 to a CentOS 6 server running cPanel to cache a website I have developed. I am trying to implement stale-while-revalidate to ensure that all users are served a cached version ...
3
votes
1
answer
926
views
How do I download a new Ubuntu release without installing it?
I want to upgrade - in this case, from Ubuntu Trusty to Vivid (going through Utopic if necessary) but I'd really rather do the upgrade in two parts, doing a dry run to get all the packages locally ...
3
votes
2
answers
5k
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 ...
3
votes
0
answers
188
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 {
...
3
votes
1
answer
1k
views
squid doesn't cache anything at all
I have configured squid for anonymous search and cache proxy. Initially it was working well, after two weeks it becomes slow(loading web page become slow) then again I had to looked into squid. I saw ...
3
votes
0
answers
3k
views
NFS showing files in directory, but can't open or stat
I'm using a network of Linux (Debian Squeeze on kernel 2.6.32) machines, sharing files using NFS (v3). The scenario is that a process running on client A will create a file through NFS on file server ...
3
votes
1
answer
3k
views
IIS caches things, even when I disable output caching
I have an IIS web server on my local network for development purposes, and I want to disable all caching mechanisms. IIS seems to be caching everything, even when I disable output caching like so:
I ...
3
votes
0
answers
644
views
How to disable Nginx web pages caching to avoid ISP cache?
My problem is simple. I did some changes on a homepage this morning (add some sentence) and it did not appear in my browser. I cleared symfony cache, nginx cache, apc cache, restart apache, restart ...
3
votes
0
answers
942
views
How can I optimize the Windows file cache so flushing a file is faster?
I have a third-party, object-oriented database server running on a Windows Server 2003 x64 machine with 24 GB of RAM. Except for some system processes and monitoring tools, the database server is the ...
3
votes
1
answer
1k
views
mod_rewrite in .htaccess causes header not to be applied - why?
Excerpt from <VirtualHost *:80> section in httpd.conf (goal: set Cache-Control for all JavaScript files):
<LocationMatch "\.js">
Header set Cache-Control "max-age=290304000, public"
&...
3
votes
1
answer
122
views
Loading of Home taking too long
We have a shared storage from NetApp mounted onto about 80 systems (all running Ubuntu 10.04 64 bit). These days there is some problem with the loading of user homes onto the lab machines (...
3
votes
1
answer
472
views
Deploy a GWT app within IIS 7
I am currently trying to configure an ASP.net Web Application through Web.config, to host a GWT WebApp in a specific folder. I've managed to configure the mimeMap for the .manifest file extension in ...
2
votes
0
answers
148
views
Cache writes with cachefilesd (non-shared mode) on Linux
I'm using cachefilesd as a read-cache for an NFS share. This is simple to set up and does what is says.
However, I would like to also cache written files. I.e., if I write some.file, and then I read ...
2
votes
0
answers
443
views
cachefilesd - how to ensure file is copied from local cache?
I have setup cachefilesd and to check if it is correct I verified following:
cachefilesd service is running
NFS storage is mounted with -o fsc and able to see FSC set to yes in /proc/fs/nfsfs/volumes
...
2
votes
0
answers
159
views
Pagespeed delivers content with gzip header but not gzip content all out of nowhere?
All out of nowhere our website did not longer load CSS.
The Chrome browser console showed
Error 330 (net::ERR_CONTENT_DECODING_FAILED)
With the httpie tool a similar error:
$ http "https://www....
2
votes
0
answers
472
views
Data corruption after dmsetup suspend, reload, resume, and re-suspend
Consider the following series of events for a device-mapper crypt target, test, holding an ext4 filesystem. These three commands swap out the crypt target's table with a new (dummy) table. This ...
2
votes
1
answer
635
views
Nginx - disable rate limiting for cached resources
I have an application does full text search on my product database. Certain searches are suggested to the user and are much more common than other searches.
As full text searches are expensive, I'm ...
2
votes
1
answer
2k
views
How to automatically purge cache with nginx using the http-cache-purge module (ngx_http_cache_purge_module.so)
I am running an Ubuntu 20.04 LEMP server with wordpress installed on it.
I am using the nginx.org repository for nginx, but I compiled the cache-purge module (ngx_http_cache_purge_module.so) from ...
2
votes
1
answer
889
views
sssd credential chaching does not work
I set up an Centos7 using sssd as authentication system.
The user identies are provided by files (passwd/group, managed by ansible), auth is done via krb5 (provided by active directory).
The sssd.conf ...
2
votes
0
answers
422
views
preventing big HDD's to spinup by using (small) SSD's as cache
I want to build a NAS that is as quiet, efficient and cool as possible.
In this scenario, I have the following parts:
-4 SATA connections to the motherboard.
-2 Hard drives, one is 1TB, the other is ...
2
votes
1
answer
85
views
Predictive HTTP Caching
A bit of background
I have ~150 scripts that directly or indirectly pull data from an IBM Cognos instance that I have no control over. I do not have access to the Cognos API, so the eventual source of ...
2
votes
0
answers
272
views
Nginx to cache pages only for bots/spiders
Imagine we have an online store site. It contains list of items to sell, and prices associated with it. Due to messy math behind price (they used to offer discounts based on user history, and we can't ...
2
votes
2
answers
3k
views
Nginx proxy cache not working with php session
Server administration is absolutely not my domain - unfortunately I am stuck with setting up a server that has Nginx as static asset server and apache behind with php-fpm for serving PHP pages.
I'm ...
2
votes
2
answers
1k
views
nginx caches responses longer than max-age
I've configured Nginx to cache all responses from an upstream server that always returns Cache-Control: public, max-age=1 but nginx seems to cache the response for 2 seconds. How come?
More ...
2
votes
0
answers
1k
views
How can I match proxy_cache_key in nginx with the path in proxy_pass if multiple slashes are used?
I'm receiving request in the form http://host.example/foo/ or http://host.example/foo// The requests are send to a backend server with proxy_pass http://backend; and cached with the key ...
2
votes
0
answers
772
views
dnsmasq not caching for non-public dns servers
I tried to configure my dnsmasq to forward requests to different dns servers depending on the domain.
server=/a.example.org/192.168.a.a
server=/b.example.org/b.b.b.b
server=/c.example.org/8.8....
2
votes
1
answer
2k
views
nginx proxy_hide_header still caches header
I'm using nginx with proxy_cache to cache some pages, I have set up a separate refresh location block to use for refreshing a particular cache entry. I have tested this and it works fine for ...
2
votes
0
answers
925
views
nginx not returning updated headers from origin server on conditional GET
I have nginx and its cache working as expected apart from one minor issue. When a request is made for the first time it hits the origin server, returns a 200 and nginx caches that response. If I ...
2
votes
0
answers
744
views
cache git clone requests through squid
Our build/ci server and developer workstations need to clone lots of repositories so we need to reduce time of downloading these repos.
Is there any way to cache git clone request through squid or ...
2
votes
0
answers
969
views
BIND cache dump file format parsing
I'm trying to analyze the contents of BIND's cache by looking into dump files, the ones generated by rndc dumpdb -cachedb.
;
; Start view _default
;
;
; Cache dump of view '_default' (cache _default)
...
2
votes
1
answer
306
views
Troubleshooting nginx caching for static assets
I have a Django website where users post images for the whole community to see (kind of like 9gag).
I use Azure storage to save and serve the images. The webserver is an nginx reverse proxy + ...
2
votes
0
answers
42
views
Protect cached content in apache
I'm facing an issue where I have some cached contents in a disk and I want to protect it with a token url.
I can protect my files via htaccess, once they are not cached (direct access), but now I ...