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  • nginx status code 200 and 304

    - by Chamnap
    I'm using nginx + passenger. I'm trying to understand the nginx response 200 and 304. What does this both means? Sometimes, it responses back in 304 and others only 200. Reading the YUI blog, it seems browser needs the header "Last-Modified" to verify with the server. I'm wondering why the browser need to verify the last modified date. Here is my nginx configuration: location / { root /var/www/placexpert/public; # <--- be sure to point to 'public'! passenger_enabled on; rack_env development; passenger_use_global_queue on; if ($request_filename ~* ^.+\.(jpg|jpeg|gif|png|ico|css|js|swf)$) { expires max; break; } } How would I add the header "Last-Modified" to the static files? Which value should I set?

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  • How do i restart my linux server in every 2 days via crontab?

    - by Barkat Ullah
    I have a Linux server containing the os version below: Linux 2.6.32-220.7.1.el6.x86_64 I want to restart it in every 2 days, please help me, I want to do it via crontab. Another help, I used a code below to drop my memory caches in every hour. 0 * * * * /root/clearcache.sh #!/bin/sh sync; echo 3 > /proc/sys/vm/drop_caches But 1st 15 in every hour my server remain so slow after cleaning the caches. My sites do not load during every hour in 1st 15 minutes. In another way if I restart my server then also caches are removed. So I decided to restart my server in every 2 days to drop my caches. Will it be helpful to restart? Or is there any other way to drop my memory caches that will not down my server?

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  • Increase memory to memcached

    - by Petrus
    I need to increase the memory size for memcached. I have done this before, but I cannot remember all the steps that I took. If I remember correctly, I downloaded /etc/sysconfig/memcached and changed CACHESIZE=64 to CACHESIZE=1024. However I am not sure if that is how it is supposed to be done. Anyone that could guide me into how I do this? Also a command that confirms the change would be useful. I am running RedHat x86_64 es5.

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  • Use Cherokee Instead of nginx in Front of Varnish to Get HTTP 1.1 Optimizations?

    - by espeed
    We have been running nginx - uWSGI, and now we are evaluating putting Varnish as a caching layer between nginx and uWSGI (similar to http://www.heroku.com/how/architecture). But, nginx only supports HTTP 1.0 on the back so it will have to create new connections with Varnish for each request. Many recommend running nginx in front of Varnish, but wouldn't it make much more sense to use something like Cherokee so that you eliminate the HTTP connection overhead since it supports HTTP 1.1 on the back?

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  • Nginx location to match query parameters

    - by Dave
    Is it possible in nginx to have a location {} block that matches query parameters. For example I want to pick up that "preview=true" in this url and then instruct it to do several different things, all possible in a location block. http://192.158.0.1/web/test.php?hello=test&preview=true&another=var The problem I'm having is that my test stuff doesn't seem to match, it seems like I can only match the URL itself? E.g. location ~ ^(.*)(preview)(.*)$ Or something aloong those lines?

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  • VCL - configuration for Magento and Varnish 3.0.2

    - by Tomas
    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 asking this because I've googled almost every site related to this theme, but 99.9% of configurations don't work because of outdated code. Details of my set-up: I use Varnish on port 80, Apache on port 81, PageCache as Magento varnish module, APC for PHP speed and Memcached for dynamic caching. Load speed is about 1.5s on home-page (Pingdom.com average results) USA ping & 2.5s Europe. Servers are located in Toronto, Canada. EDIT: This is my full VCL configuration http://pastebin.com/885BzHCs (I just use xxx.xxx.xxx.xxx for my IPs) This is the info from the command (varnishtop -i TxHeader -I Cookie): TxHeader Cookie: frontend=965b5...(*lots of numbers); adminhtml=3ae65...(*lots of numbers); EXTERNAL_NO_CACHE=1 "(*lots of numbers)" is just my adding to the info Any idea how to avoid Varnish hitting this cookies? (If I got correctly the idea about avoiding Vanrish hitting the cookie and not caching the home page). Thank you for any help!

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  • To what extent is size a factor in SSD performance?

    - by artif
    To what extent is the size of an SSD a factor in its performance? In my mind, correct me if I'm wrong, a bigger SSD should be, everything else being equal, faster than a smaller one. A bigger SSD would have more erase blocks and thus more leeway for the FTL (flash translation layer) to do garbage collection optimization. Also there would be more time before TRIM became necessary. I see on Wikipedia that it remarks that "The performance of the SSD can scale with the number of parallel NAND flash chips used in the device" so it seems throughput also increases significantly. Also many SSDs contain internal caches of some sort and presumably those caches are larger for correspondingly large SSDs. But supposing this effect exists, I would like a quantitative analysis. Does throughput increase linearly? How much is garbage collection impacted, if at all? Does latency stay the same? And so on. Would the performance of a 8 GB SSD be significantly different from, for example, an 80 GB SSD assuming both used high quality chips, controllers, etc? Are there any resources (webpages, research papers, presentations, books, etc) that discuss correlations between SSD performance (4 KB random write speed, latency, maximum sequential throughput, etc) and size? I realize this does not really sound like a programming question but it is relevant for what I'm working on (using flash for caching hard drive data) which does involve programming. If there is a better place to ask this question, eg a more hardware oriented site, what would that be? Something like the equivalent of stack overflow (or perhaps a forum) for in-depth questions on hardware interfaces, internals, etc would be appreciated.

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  • How to install a proxy LDAP

    - by Jean-Claude
    I have to install an LDAP proxy on a compute cluster frontend. The idea is to avoid the compute nodes to make too many requests on the campus LDAP server. How can I install this to make it work with the school's LDAP? The frontend OS is a RHEL 6.2. I found that I have to install the LDAP server and configure it as a proxy. But all I can find is examples of /etc/openldap/slapd.conf file configuration but after testing different configuration, no results. Furthermore, according to RHEL 6 - Deployment Guide, this config file is obsolete: OpenLDAP no longer reads its configuration from the /etc/openldap/slapd.conf file. Instead, it uses a configuration database located in the /etc/openldap/slapd.d/ directory. Any help is welcomed. Thank you

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  • High disk I/O activity in CentOS server

    - by triiim
    I have about 16 websites in a CentOS dedicated, and I am having some problems on high traffic hours, it seems to be a high disk I/O activity causing a general slowdown. I've installed atop and this is what I see on the bottom (the server has been restarted thats why the values are so low): *** system and process activity since boot *** PID RDDSK WRDSK WCANCL DSK CMD 1/18 2176 1.7G 7.3G 854.4M 39 mysqld 671 1248K 3.0G 0K 13 flush-8:0 566 0K 1.1G 0K 5 jbd2/sda2-8 2401 124.2M 529.1M 22408K 3 crond 2032 2.2G 502.0M 0K 12 nginx 2360 425.8M 115.3M 4188K 2 httpd flush-8:0 and jbd2/sda2-8 are the processes I see with iotop using 99% on the IO column, and they are the processes that write the most on the hdd (after mysql). From what I saw in google this could be caused by some ext4 related bug, the current kernel is: Linux srvr.com 2.6.32-71.29.1.el6.x86_64 #1 SMP Mon Jun 27 19:49:27 BST 2011 x86_64 x86_64 x86_64 GNU/Linux I asked the hosting support to update the kernel and they tried but they now say that the server wont boot with the new installed kernel and they had to go back to the previous, they are not helping very much. Does someone has any idea how could I solve the high disk usage caused by flush-8:0 and jbd2/sda2-8 processes?

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  • Squid closing the connection on long HTTP GET requests

    - by Rhys
    When running a database query on a specific external site we use, Squid seems to cut off the connection after a consistent period of time (just over a minute). The query is submitted through a standard web form is that uses GET to query their database. Firefox 3 just displays a blank page. Internet Explorer throws a 'Page Cannot Be Displayed' error (tested in v6 and v8). When we perform the same query on the same machine, but bypass the Squid proxy, it works fine. The query takes about two and a half minutes to complete. There are a few timeout settings in Squid, but I honestly don't know what one to be looking at. Any possible solutions would be much appreciated. Cheers

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  • High frequency, kernel bypass vs tuning kernels?

    - by Keith
    I often hear tales about High Frequency shops using network cards which do kernel bypass. However, I also often hear about them using operating systems where they "tune" the kernel. If they are bypassing the kernel, do they need to tune the kernel? Is it a case of they do both because whilst the network packets will bypass the kernel due to the card, there is still all the other stuff going on which tuning the kernel would help? So in other words, they use both approaches, one is just to speed up network activity and the other makes the OS generally more responsive/faster? I ask because a friend of mine who works within this industry once said they don't really bother with kernel tuning anymore-because they use kernel bypass network cards? This didn't make too much sense as I thought you would always want a faster kernel for all the CPU-offloaded calculations.

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  • nginx not returning 304 on cached content

    - by Don H
    I'm using nginx as a reverse proxy with an Apache back-end handling some PHP files. The files return the right expiry headers and proxy_cache does a good job of caching them, but I've noticed that the cached content returns a 200 on every refresh, when it might be more efficient to return a 304 on the cached files. The files in question are generated by PHP. The urls do not have .php in them as they've been prettified. Any idea why nginx might not be returning 304 on repeated visits to a cached PHP output? To clarify: It's using proxy_cache for caching dynamic PHP pages (not static html pages generated by PHP). I'm setting expires headers in the PHP file of time + 24 hours. With that in mind, I was hoping nginx would be able to then return 304s on its cached versions during that 24 hour window.

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  • Clearing Windows file share "memory"

    - by Tom Shaw
    I'm currently upgrading a Samba file server (from 3.0.23d to 3.4.3). I have a problem on the Windows client side: if the client was accessing a UNC path or mapped drive from the Samba server before the upgrade, then after the upgrade those paths or drives are not accessible. However, I can consistently resolve the client side problem for good by rebooting the client and then re-mapping all of the mapped drives. The problem appears to be related to the client's "memory" of the pre-upgrade Samba server, which the reboot and re-map clears. I have the same issue and same fix on Windows XP SP3 and Windows Server 2003 SP2. This question is specifically: is it possible to reproduce the benefits of the Windows reboot without actually rebooting the client? I have tried restarting various Windows services, disabling and enabling the network, logging out and back in again, but nothing except a reboot appears to do the trick.

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  • APC on PHP 5.4 does not seem to be installed after installation

    - by Burning the Codeigniter
    I've recently upgraded to PHP 5.4 from 5.3.6, I did the command apt-get upgrade php5 with the custom PHP 5.4 repo which I added to the apt-get repositories, now that I upgraded, I restarted php-fastcgi and php5-fpm the APC does not seem to be installed with it after I did pecl install apc it seems to configure and install with the details below: Configuring for: PHP Api Version: 20090626 Zend Module Api No: 20090626 Zend Extension Api No: 220090626 But in my phpinfo() I get this: PHP API 20100412 PHP Extension 20100525 Zend Extension 220100525 Which I don't understand, how can I configure PECL to install with PHP 5.4 with my version, my installation with apc.so is stored to /usr/lib/php5/20090626/ however in /usr/lib/php5/ I have two PHP versions: 20090626 20100525 How can I remove either one and leave PHP 5.4 and manage it to install apc in the correct PHP version? I'm running Ubuntu 11.04 on my server. I need help on this please.

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  • apc fragments and configuration

    - by Jourkey
    I have quite a bit of fragmentation. Is this a serious problem? How can I fix this? How can I make sure it doesn't happen again? Are there any other config recommendations for me? Thanks! http://i48.tinypic.com/zv5r4g.jpg

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  • Determining where a file is being cached

    - by RoadieRich
    I've got a debian webserver running apache, from which I regularly download an executable using IE 8 on an XP virtual machine (over LAN). However, I realised that somewhere along the line that I've been repeatedly running the same version (and wondering why my changes weren't being displayed). A Ctrl+F5 in IE will let me download the new version (although the page is always updated with a simple F5). This makes me suspect that the caching is happening in windows/IE, but I'm not certain. Wherever it's happening, is there an easy way to prevent it at the server? Eventually, we're hoping to offer the software to the entire company, and we'd like to avoid having to tell everyone to do a Ctrl+F5 every time there's an updated version.

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  • Computers with Small Capacity SSD - For caching?

    - by RXC
    Recently, in newsletters from websites, I have been seeing computers for sale from manufacturers that include an HDD and an SSD but the SSD has a small capacity like 24 GBs. I don't know if this still holds true, but I learned that when building a computer, you would want to install your OS on your fastest hard drive. I do a lot of PC gaming, so I install my OS and games on my SSD, because I learned that games and many applications make lots of system calls to the OS and performance can only be as fast as the slowest piece. Why these computers come with small capacity SSDs? Most OS's take up around 20 to 30 GBs of space, so what are the benefits of such a small SSD? Are these small size SSDs for caching? and what exactly does caching mean (what does it do and how does it help)?

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  • How to test whether an image is already in cache? [migrated]

    - by Evik James
    I am developing a web site that has a lot of large, high-quality images on the home page. On the home page, there is an image carousel that pulls ten high quality images from a database. The images can be 1 meg each. The carousel images aren't my problem (right now), but it has something to do with it. The problem I am trying to address right now is that I use a high quality background image that I want to continue using, it's about 180k. If I have the background in cache on the home page, I want to use it. If not, then I don't want to use it on the home page. I'll load it from a different page. When the user returns to the home page, and the background image is in cache, I want to use it. Can I test whether an image is already in cache and if so, dynamically load or NOT load based on that? You can see the home page here: http://flyingpiston2012-com.securec37.ezhostingserver.com/

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  • Is there some sort of CacheDependency in System.Runtime.Caching?

    - by Venemo
    I heard that .NET 4 has a new caching API. Okay, so the good old System.Web.Caching.Cache (which is, by the way, still there in .NET 4) has the ability to set so-called CacheDependency objects to determine whether a cached item is expired or not. One can also specify custom logic for determining whether a cached item is still useable or not by deriving a custom subclass from CacheDependency. I'm curious, is there a way to provide such a logic in the new API?

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  • Leverage browser caching

    - by Daniel
    I have a website and when I check page speed with Google plug-in, I receive: Leverage browser caching The following resources are missing a cache expiration Where can I change the settings for this?

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