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• Normalize Accept-Encoding via HAProxy for optimized Squid hit rate

  - by Matt Beckman

  Our website infrastructure uses HAProxy for load balancing, a Squid cluster for caching, and application data is on an IIS cluster. We load balance HAProxy by URI to optimize the Squid hit-rate, but we know that Squid is holding different copies of each page based on the Accept-Encoding header passed to it by the browser, and so IE (gzip, deflate) will have a different copy of a cached page than Firefox (gzip,deflate) or Chrome (gzip,deflate,sdch). We want to normalize the Accept-Encoding headers and I think the best place to do so would be in HAProxy. I'd appreciate it if someone could offer some ideas on how to accomplish this without breaking support for clients without gzip or deflate support.

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• RODC password replication and A/D sites and subnets

  - by Gregory Thomson

  I work at a school district with about 30 school sites. Windows 2008 A/D setup - all central at the district office. In A/D, all is under one site, and no subnets defined. One A/D forest and only one domain under that. We're now looking to start putting RODCs at the schools to put the authentication and DNS out there closer to them. I haven't worked with A/D sites and subnets, and only a little with RODC password replication. But just got an invite to a meeting to talk about this tomorrow... If we start breaking down the A/D pieces into sites/subnets, can we also use that as a way to help apply an RODC password replication policy in a way that matches so that only each school sites' users passwords are replicated/cached on their RODC?

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• IIS7 response size thresholds

  - by DanielM

  I have a customer who is attempting video playback via HTTP progressive download of very large files ( 1 GB). There is no problem once a file is cached at the edge via my CDN, but hits to my origin (first hits prior to edge-cache population) experience stalling and loss of sync between audio and video about an hour and a half into playback. This occurs pretty reliably at that point, suggesting that some threshold somehwere is getting hit. Are there IIS configuration knobs governing HTTP Response size? Other data points: I am unable to replicate this problem. I am looking at client bandwidth and last mile issues. I am looking at possible encoding recipe dependencies. But this problem never came up when we were using a "push" cache configuration (CDN-hosted origin), so something funky serverside at my origin seems like a likely culprit. Thanks ...

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• Varnish: User specific pages

  - by jchong0707

  I'm new to Varnish and am interested in using it to speed up my web application I wanted to know if Varnish can handle caching and serving user specific content. For example if I have a page say for example /welcome which is dynamically generated in the backend and is user specific So if User John Smith shows up to /welcome it'll show in the page itself 'Welcome John Smith' and if Bob Smith shows up to /welcome it'll show 'Welcome Bob Smith' Ideally both of those /welcome pages will be cached for each unique User, is this something Varnish can do? (is this even a good Use Case of Varnish?) Thanks!

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• Memory is free, but still swapping?

  - by japancheese

  Hello, I'm sure this is a pretty basic question, but I'm just trying to get a grasp of what's going on with my Ubuntu (Hardy Herron) server (running a Rails-based site). It seems that I have free memory available, yet the system is reporting that it is still swapping memory (unless I'm reading this incorrectly?). Here is the "free -m" output total used free shared buffers cached Mem: 1024 905 118 0 33 409 -/+ buffers/cache: 462 561 Swap: 2047 95 1952 Could anyone explain to me some possible reasons that it is maintaining 95mb of swap at all times (it is never less)? I'm just looking for some leads on things I could check out that would explain to me exactly how memory is utilized in Linux.

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• Passenger, Apache and avoiding page caching

  - by user38382

  I'm hosting a rack application with passenger and apache. The application is setup to cache the content of each request to the public directory after each request. This allows apache to serve the content directly as a static page for future requests. I would like to tell Apache, presumably through some rewrite rules that any requests with query parameters should not be cached, but instead passed down to the rack application. With a mongrel setup I would just redirect it to the balancer if it meets my rewrite conditions. How do you do the same with passenger?

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• How to install latest version of imagick on centos 5.8 64bit using bash

  - by user57221

  How can I download and install latest version of imagick on centos 5.8 64bit using bash for php 5.4. >yum info php Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.ellogroup.com * epel: mirror01.th.ifl.net * extras: mirror.ellogroup.com * updates: mirror.ellogroup.com Installed Packages Name : php Arch : x86_64 Version : 5.4.3 Release : 1.el5.remi Size : 8.8 M Repo : installed Summary : The PHP HTML-embedded scripting language. (PHP: Hypertext Preprocessor) URL : http://www.php.net/ License : PHP Description: PHP is an HTML-embedded scripting language. PHP attempts to make it : easy for developers to write dynamically generated webpages. PHP also : offers built-in database integration for several commercial and : non-commercial database management systems, so writing a : database-enabled webpage with PHP is fairly simple. The most common : use of PHP coding is probably as a replacement for CGI scripts. : : The php package contains the module which adds support for the PHP : language to Apache HTTP Server.

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• rsyslog appears to act on old configuration

  - by Jeff Lee

  I'm using a template to dynamically generate rsyslog filenames. I've made some changes from my original format, but rsyslog still appears to be using both the new template and the old after restarting. My filename template went from this: $template RemoteDailyLog,"/var/log/remote/%hostname%/%$year%/%$month%/%$day%.log" To this: $template RemoteDailyLog,"/var/log/remote/%hostname%/%fromhost-ip%/%$year%/%$month%/%$day%.log" I stopped rsyslogd using service rsyslog stop, deleted all of my log files using rm -rf /var/log/remote/*, and then restarted rsyslogd with service rsyslog start. The problem is rsyslog seems to be building folder structures of the type "/var/log/remote/%hostname%/%$year%/%$month%/%$day%.log" (i.e., without the remote IP), which no longer appears anywhere in my configuration. Is it possible that old log or config data have been cached somewhere and are being preserved through the server restart? This is creeping me out a little.

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• ISA caching with no cache-related info in response header

  - by Mike M. Lin

  From the documentation, I can't figure out what criteria an ISA server uses to figure out if a cached file is valid when no cache-related info is in the response header. Let's say I got this header in my response on Thu, 13 Jan 2011 18:43:35 GMT: HTTP/1.1 200 OK Date: Thu, 13 Jan 2011 18:43:35 GMT Server: Apache/2.2.3 (Red Hat) Content-Language: en X-Powered-By: Servlet/2.5 JSP/2.1 Keep-Alive: timeout=15 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html; charset=ISO-8859-1 There's no cache directive, no last-modified field, no expires field. How will the ISA server decide for how long to cache this response?

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• How to delete folder of owner/group 99 99

  - by Aakash Chakravarthy

  I am using wordpress with wp-super-cache plugin. This plugin automatically created a cache folder in my site for storing the cached files. But unusually it created folder with owner/group 99 99. It was created automatically. Due to this, i am not able to delete that folder or change the CHMOD of that folder. This really a headache. I searched google, but none gave me a good answer. Please help me delete or change the CHMOD of that folder ? I am on Linux server.

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• httpd service keep restarting. after 15-20 mins

  - by niraj

  I have recently purchased Dedicated Server which has 16bg ram and 1TB Harddisk. It has Cpanel and for firewall CSF Installd. I am mainly going to install it for File hosting service. Now the day i moved my httpd service keep restarting every 15-20 mins. It becomes unresponsive after that so have to manually restart it. My httpd settings are Start Servers = 5 Minimum Spare Servers = 5 Maximum Spare Servers = 10 Server Limit = 20000 Max Clients = 10000 Max Requests Per Child = 10000 Keep-Alive = On Keep-Alive Timeout = 5 Max Keep-Alive Requests = Unlimited Timeout 300 TOP is top - 14:53:41 up 1 day, 23:39, 2 users, load average: 0.10, 0.14, 0.09 Tasks: 1563 total, 1 running, 1562 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.6%sy, 0.0%ni, 98.1%id, 0.2%wa, 0.0%hi, 0.5%si, 0.0%st Mem: 16303780k total, 16142048k used, 161732k free, 135264k buffers Swap: 8224760k total, 868k used, 8223892k free, 14136616k cached Please help me in this its keep happning.

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• How are thumbnails stored on Mac OS X?

  - by Alberto Moriconi

  I have noticed that thumbnails on Mac OS X don't seem to be generated every time I open a folder, but to be somehow "cached" instead. I wasn't able, however, to find a folder where they clearly look to be stored. I thought then they could be saved as some kind of metadata; i found, however, that when deleting a file (e.g. from the Desktop) and saving immediately after a file by the same name, the preview for the previous file is showed for ~ a second. Are they stored separately from data? How and when are they invalidated (e.g. only when a file by the same name appears in the same directory)?

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• Cron Script to Delete Folder Contents Every 5 Minutes on Media Temple

  - by Brian Iannone

  I'm not familiar with server-side scripting, but I'm currently using a PHP application on Media Temple to cache JPEGs from four webcams hosted on a server located in the middle of the Indian Ocean. (Hence my reason for caching them in the US.) The webcams are updated every five minutes. The PHP application stores the cached images in http://static.rigic.co/cache/. I would like to create a cron script to automatically delete the contents of "cache" (not the folder itself; just the files inside) at a regular interval.

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• Running "ipconfig /displaydns" in cmd prompt still displays results even after I run "ipconfig /flushdns"

  - by 400_THE_CAT

  Whenever I run "ipconfig /displaydns" I get a long list of sites even after running "/flushdns." I thought my results should be empty considering /flushdns. Is this normal behavior? I also noticed that after I run /flushdns and browse the internet for a couple of hours, my list of cached sites doesn't really change. Google.com, for example isn't on the list but a bunch of sites I've never visited do show up in my DNS cache. Can someone explain this?

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• MySQL maintenance - how to clear the buffer?

  - by Dougal

  We have a server running our web app (PHP / MySQL) which is SLOW. My predecessor says that: "We use to do database maintenance, which use to clear the buffer, cached and unwanted variables." And I wonder what on earth he means with that statement? Does he mean a simple optimize of the tables? Or the query cache? I understand MySQL but don't really know what he is describing. I would appreciate any pointers. Thanks.

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• is there a way to automate changing filenames in <link> , <script> tags

  - by nepsdotin

  when we use Expires header for text files like js, css, contents are cached in the browser, to get new content we need to change in the html file the new names in the link and script tag. When we add changes. How can we automate it. I may have some bunch of html files in multiple folders also in subdirectories. There would be a text file filelist.txt OldName NewName oldfile1-ver-1.0.js oldfile1-ver-2.0.js oldfile2-ver-1.0.js oldfile2-ver-2.0.js oldfile3-ver-1.0.js oldfile3-ver-2.0.js oldfile4-ver-1.0.js oldfile4-ver-2.0.js The script should change all the oldfile1-ver-1.0.js into oldfile1-ver-2.0.js in the html, php files I would run this script before i start uploading. Finally the script could create a list of files and line number where it made the update. The solution can be in PERL/PHP/BATCH or anything thats nice and elegant

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• linux migration/N high cpu consumption

  - by Alexander

  on my linux appliance based on 3.0.0-14 kernel I got: RPN:/tmp# ps axuf | grep migration root 6 92.9 0.0 0 0 ? S Apr23 2788:33 \_ [migration/0] root 7 99.7 0.0 0 0 ? S Apr23 2993:20 \_ [migration/1] my top is RPN:/tmp# top -b -n1 top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73 Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers Swap: 0k total, 0k used, 0k free, 183168k cached My question: why processes "migration/N" take so much CPU?

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• Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

  - by Travis

  I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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• Exchange 2003 Event ID 9337 - Offline Address Book

  - by Creepycc

  I have a support issue with an Exchange 2003 SP2 server. Event ID: 9337 Description: OALGen did not find any recipients in address list '\Global Address List'. This offline address list will not be generated. - Default Offline Address List When you preview the Global Address list within Exchange Systems Manager all is fine. Turning off cached mode on Outllok clients still errors Public fiolders / System folders are fine OABINTEG detects no issues, Pfdavadmin has checked all DACL The GAL and OAB have been deleted / recreated several times (With differnt names) DCDIAG, NETDIAG, ExchangeBPA all run without error Exhausted Google links diagnosing this issue, any suggestions?

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• Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

  - by magneticMonster

  I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing. Why am I running out of lowmem and how do I increase it? Some details: $ cat /proc/sys/vm/lowmem_reserve_ratio 256 256 32 $ free -lm total used free shared buffers cached Mem: 32086 24611 7475 0 0 24012 Low: 464 407 57 High: 31621 24204 7417 -/+ buffers/cache: 598 31487 Swap: 2047 0 2047

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• Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

  - by George Bailey

  ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would perform better with compression turned on. This can be easily tested when writing files by measuring CPU and disk usage and throughput. (of course latency may exist,, but this would not be an issue for large files). But what about cache? If data will have to be decompressed every time it is read then this is probably less of a good idea. Is the cached data compressed?. Does anybody have some information on this?

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• Samba as a PDC and offline authentication

  - by Aimé Barteaux

  Say I have a Windows laptop which has been connected to a domain. The domain has a Samba server as a PDC. Now say that I move the laptop outside of the network (the network is completely inaccessible). Will I be able to logon into accounts I have accessed before on the laptop (through GINA)? Update: Looking at the smb.comf documentation I noticed the setting winbind offline logon: This parameter is designed to control whether Winbind should allow to login with the pam_winbind module using Cached Credentials. If enabled, winbindd will store user credentials from successful logins encrypted in a local cache.. To me it looks like this solves the issue but can anyone else confirm it and/or point out if any additional values need to be set?

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• CentOS - Yum doesn't update anymore?

  - by Xanathos

  I've been trying to use yum now, but for some reason, not even the search work anymore. I even tried putting packages I already downloaded in the search criteria and is the same. [root@AMDFX03 Downloads]# yum search glibc Loaded plugins: fastestmirror, refresh-packagekit, security Loading mirror speeds from cached hostfile epel/metalink | 22 kB 00:00 * base: centos.secrel.com.br * epel: archive.linux.duke.edu * extras: centos.secrel.com.br * rpmforge: apt.sw.be * updates: centos.secrel.com.br adobe-linux-x86_64/primary | 1.2 kB 00:00 http://linuxdownload.adobe.com/linux/x86_64/repodata/primary.xml.gz: [Errno -1] Metadata file does not match checksum Trying other mirror. Error: failure: repodata/primary.xml.gz from adobe-linux-x86_64: [Errno 256] No more mirrors to try. This error always appear no matter what I do. Please, can you tell me how to fix this, or at least how to reset yum's configuration?

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• Compilation of Etherpad fails in an OpenVZ VE

  - by ulf

  Hi everyone. I’m almost giving up, this will be my last try: I try to compile Etherpad on my OpenVZ server. It’s running a Debian 5.0 as the host system, in the VE I’ve got Ubuntu 10.04. I installed Etherpad in this VE with the instructions from the official Ubuntu Wiki: https://wiki.ubuntu.com/Etherpad. Everything runs fine until it comes to compilation. After calling bin/build.sh as described in the wiki the first steps are running fine. But then I’m running into a memory error: java.io.IOException: Cannot run program "cp": java.io.IOException: error=12, Cannot allocate memory Well, I understand the error message but don’t see the cause. The command free tells me that there’s plenty memory left in this VE: total used free shared buffers cached Mem: 2415236 1140872 1274364 0 0 0 -/+ buffers/cache: 1140872 1274364 Swap: 0 0 0 Beautiful. But even repeating the compilation process doesn’t bring me any further. Any help would be appreciated.

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• How can I diagnose cache misses when using Apache as a reverse proxy?

  - by johnstok

  I have set up Apache 2.2 as a reverse proxy with the following configuration: # jBoss proxying ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /foo http://localhost:9080/foo ProxyPassReverse /foo http://localhost:9080/foo ProxyPassReverseCookiePath /foo /foo # Reverse proxy caching CacheEnable disk /foo # Compression SetOutputFilter DEFLATE BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE\s(7|8) !no-gzip !gzip-only-text/html DeflateCompressionLevel 9 Header append Vary User-Agent env=!dont-vary However, in a number of cases where I expect a cached response to be returned the request is sent through to the origin server at localhost:9080. Responses have a HTTP Vary header of 'Accept-Encoding,User-Agent' which is to be expected given the mod_deflate configuration. How can I determine why Apache is unable to serve a response from the cache?

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