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• MemCache-repcached compile error

  - by Ramy Allam

  I'm trying to install [memcached-1.2.8-repcached-2.2.1]( http://sourceforge.net/projects/repcached/files/latest/download?source=files) And I have the following error after running the make command: make all-recursive make[1]: Entering directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1' Making all in doc make[2]: Entering directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1/doc' make[2]: Nothing to be done for `all'. make[2]: Leaving directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1/doc' make[2]: Entering directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1' gcc -DHAVE_CONFIG_H -I. -DNDEBUG -g -O2 -MT memcached-memcached.o -MD -MP -MF .d eps/memcached-memcached.Tpo -c -o memcached-memcached.o test -f 'memcached.c' || echo './'memcached.c memcached.c: In function ‘add_iov’: memcached.c:697: error: ‘IOV_MAX’ undeclared (first use in this function) memcached.c:697: error: (Each undeclared identifier is reported only once memcached.c:697: error: for each function it appears in.) make[2]: * [memcached-memcached.o] Error 1 make[2]: Leaving directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1' make[1]: * [all-recursive] Error 1 make[1]: Leaving directory `/usr/local/src/pro/memcached-1.2.8-repcached-2.2.1' make: * [all] Error 2 OS : Centos5.7 64bit gcc-4.1.2-51.el5 gcc-c++-4.1.2-51.el5 libgcc-4.1.2-51.el5 Note : Memcached and memcache extension for php are already installed root@server[~]# memcached -h memcached 1.4.5 php ext http://pecl.php.net/get/memcache-2.2.6.tgz

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• Stop Windows Domain Environment Caching Old Passwords?

  - by Daryl Gill

  I have noticed on my domain environment; the old Administrator password (before password expire).. The client machines have cached the old password and have the ability to bypass the new password by entering the old one..? I have noticed on my domain environment; the old Administrator password (before password expire).. The client machines have cached the old password and have the ability to bypass the new password by entering the old one..? Basically; I'm running a UAC enabled domain, which needs the administrator password to continue basic stuff; installations and such. The password for the administrator account has been changed due to expiration of said accounts password. By accident a fellow administrator typed the old password and still bypassed the UAC with what should have been the incorrect password. Is this a bug with the environment? or something that needs to be tweaked in the server sided settings? Is this a bug with the environment? or something that needs to be tweaked in the server sided settings?

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• Youtube videos all appear transparent in Chrome (I can see through to my desktop -- see pic!)

  - by kalaracey

  MBP 6,2 :: Google Chrome 13.0.782.32 beta :: Adobe Flash Player 10,3,181,26 UPDATE: only Youtube is affected. Vimeo, other flash, etc. all works great. Hello. I recently had to hard reboot my MBP. After that, I could not watch Youtube videos or (I believe) other flash enabled content. The videos appear transparent, as if there were a "hole" in my browser (Chrome) such that I could see through the hole and see my desktop. I've attached a picture (just picked a random video) Thanks.

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• Squid 3 reloading makes it stop serving requests

  - by coredump

  So, we use Squid 3 here (3.0.STABLE8-3+lenny4), pretty standard configuration (no dansguardian or similar) + NTLM authentication with LDAP background, circa 1000 users on a busy day, and our acls reference some external files (allowed/blocked sites/ip addresses). On Squid 2.X we used to be capable of reloading it's configuration (to add or sites or addresses to rules, etc) and squid would not stop serving during the reload. Since we changed to 3.0, that seems to be impossible: everytime we use reload (or -k reconfigure) it stop serving requests for as long as 2 minutes, and clients receive a Configured proxy is not accepting connections message. I checked the documentation and got nothing about it, does anyone else suffer from this problem or is it a isolated case on my setup? Also, if you have Squid 3.0 and doesn't suffer from this problem, how is your squid configured?

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• Disable mod_cache to fix website

  - by Zach Russell

  I am working on a website that runs on WordPress. The an error occurs when accessing the blog page that it displays the RSS feed (in XML) rather than the posts. After some research I found out the when enabling mod_cache this error sometimes occurs. I see when looking at the apache2 modules enabled apache2ctl -M it shows that mod_cache, mod_mem_cache and mod_disc_cache are enabled. What should I disable in order to resolve this problem?

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• Are there any HTPC-optimized web browsers?

  - by smackfu

  Features that I would ideally include in "HTPC-optimized": Full-screen. Navigable using a remote or the keyboard arrows. Legible at couch distances. Or, to put it another way, imagine the design requirements for Hulu Desktop or XBMC or WMC, applied to a web browser. Opera on a Wii meets most of these criteria but not being HD wastes a lot of potential. If a single solution doesn't exist, is there some combination of Firefox add-ons that will get me there?

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• How can I get Opera speed-dial and password management features in other browsers?

  - by Howard Guo

  I heavily rely on Opera's speed dial and password management features. Lack of these two features is really stopping me from switching to another web browser such as Chrome or Firefox. Opera's password management has two unique characteristics which I rely on heavily: It saves passwords on all pages, (apparently) despite the page's meta data asking not to save passwords. It offers keyboard shortcut and button to automatically fill in username/passwords and all other fields in a login form, then automatically submit the form. (So I'm only one key/click away from logging into a website) How can I get those functions in other browsers? Thank you! Edit: Reason being that I use other web browsers at work and I wish they could have those functions.

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• Browsers with good keyboard support

  - by egon

  What browsers have good keyboard support? That means you don't have to use the mouse so much. Or what is a good setup for browser + keyboard interaction. I know the basic keyboard shortcuts (tab switching, new tabs etc.) but I don't know a good way to switch between links and search areas - usually that means TAB, Shift-TAB one at a time. Is there maybe some plugin that'll add numbers to links and I could just do something like 12 to go to the link 12?

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• Caching API Proxy Server

  - by edc1591

  I need to have a server that caches API responses and then forwards them along to a desktop app. I don't really have much experience with this, so I have a few questions. First of all, what kind of server should I get? I already use Linode for my websites, so ideally I'd like to go with them. I expect to get anywhere from 30 million to 40 million requests to my proxy server each month. Will a 512 Linode be able to support that? Also, is there any software out there that does this already, or will I have to write my own? The API responses are roughly 10 KB each on average, so doing the math, that's a lot of data each month. Should I just add more transfer to whatever server I buy, or can I somehow compress the API responses before sending them off to the user? Thanks for any help.

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• Ignoring GET parameters in Varnish VCL

  - by JamesHarrison

  Okay: I've got a site set up which has some APIs we expose to developers, which are in the format /api/item.xml?type_ids=34,35,37&region_ids=1000002,1000003&key=SOMERANDOMALPHANUM In this URI, type_ids is always set, region_ids and key are optional. The important thing to note is that the key variable does not affect the content of the response. It is used for internal tracking of requests so we can identify people who make slow or otherwise unwanted requests. In Varnish, we have a VCL like this: if (req.http.host ~ "the-site-in-question.com") { if (req.url ~ "^/api/.+\.xml") { unset req.http.cookie; } } We just strip cookies out and let the backend do the rest as far as times are concerned (this is a hackaround since Rails/authlogic sends session cookies with API responses). At present though, any distinct developers are basically hitting different caches since &key=SOMEALPHANUM is considered as part of the Varnish hash for storage. This is obviously not a great solution and I'm trying to work out how to tell Varnish to ignore that part of the URI.

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• Slow Memcached: Average 10ms memcached `get`

  - by Chris W.

  We're using Newrelic to measure our Python/Django application performance. Newrelic is reporting that across our system "Memcached" is taking an average of 12ms to respond to commands. Drilling down into the top dozen or so web views (by # of requests) I can see that some Memcache get take up to 30ms; I can't find a single use of Memcache get that returns in less than 10ms. More details on the system architecture: Currently we have four application servers each of which has a memcached member. All four memcached members participate in a memcache cluster. We're running on a cloud hosting provider and all traffic is running across the "internal" network (via "internal" IPs) When I ping from one application server to another the responses are in ~0.5ms Isn't 10ms a slow response time for Memcached? As far as I understand if you think "Memcache is too slow" then "you're doing it wrong". So am I doing it wrong? Here's the output of the memcache-top command: memcache-top v0.7 (default port: 11211, color: on, refresh: 3 seconds) INSTANCE USAGE HIT % CONN TIME EVICT/s GETS/s SETS/s READ/s WRITE/s cache1:11211 37.1% 62.7% 10 5.3ms 0.0 73 9 3958 84.6K cache2:11211 42.4% 60.8% 11 4.4ms 0.0 46 12 3848 62.2K cache3:11211 37.5% 66.5% 12 4.2ms 0.0 75 17 6056 170.4K AVERAGE: 39.0% 63.3% 11 4.6ms 0.0 64 13 4620 105.7K TOTAL: 0.1GB/ 0.4GB 33 13.9ms 0.0 193 38 13.5K 317.2K (ctrl-c to quit.) ** Here is the output of the top command on one machine: ** (Roughly the same on all cluster machines. As you can see there is very low CPU utilization, because these machines only run memcache.) top - 21:48:56 up 1 day, 4:56, 1 user, load average: 0.01, 0.06, 0.05 Tasks: 70 total, 1 running, 69 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.3%st Mem: 501392k total, 424940k used, 76452k free, 66416k buffers Swap: 499996k total, 13064k used, 486932k free, 181168k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6519 nobody 20 0 384m 74m 880 S 1.0 15.3 18:22.97 memcached 3 root 20 0 0 0 0 S 0.3 0.0 0:38.03 ksoftirqd/0 1 root 20 0 24332 1552 776 S 0.0 0.3 0:00.56 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0 5 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kworker/u:0 6 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 7 root RT 0 0 0 0 S 0.0 0.0 0:00.62 watchdog/0 8 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cpuset 9 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper ...output truncated...

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• How to analyze webalizer's dns_cache.db file under windows?

  - by flickaswitch

  Hi guys, I am trying to take a look at the dns_cache.db file that is generated by webalizer when doing DNS lookups to find out why some host files seem not to be resolved resolved properly. Is there any way I can do that under windows (wcmgr does not work there)? Thank you & regards, flickaswitch

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• SQL Service Broker enabled causes 100% CPU

  - by user40373

  I have new set of code for a website that is using SqlCacheDependencies based on sql commands. I have enabled SQL Service Broker and some triggers on update/insert/delete and it is causing 100% CPU. Any ideas if I am doing something wrong or suggestions to improve? Here are the SQLchanges I ran: alter database DATABASE_NAME set enable_broker WITH ROLLBACK IMMEDIATE grant subscribe query notifications to CONNECTION_USER_NAME grant send on service::sqlquerynotificationservice to CONNECTION_USER_NAME ALTER AUTHORIZATION ON DATABASE::DATABASE_NAME TO CONNECTION_USER_NAME;

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• Linux not buffering block I/O when the device is not "in use" (i.e. mounted)

  - by Radek Hladík

  I am installing new server and I've found an interesting issue. The server is running Fedora 19 (3.11.7-200.fc19.x86_64 kernel) and is supposed to host a few KVM/Qemu virtual servers (mail server, file server, etc..). The HW is Intel(R) Xeon(R) CPU 5160 @ 3.00GHz with 16GB RAM. One of the most important features will be Samba server and we have decided to make it as virtual machine with almost direct access to the disks. So the real HDD is cached on SSD (via bcache) then raided with md and the final device is exported into the virtual machine via virtio. The virtual machine is again Fedora 19 with the same kernel. One important topic to find out is whether the virtualization layer will not introduce high overload into disk I/Os. So far I've been able to get up to 180MB/s in VM and up to 220MB/s on real HW (on the SSD disk). I am still not sure why the overhead is so big but it is more than the network can handle so I do not care so much. The interesting thing is that I've found that the disk reads are not buffered in the VM unless I create and mount FS on the disk or I use the disks somehow. Simply put: Lets do dd to read disk for the first time (the /dev/vdd is an old Raptor disk 70MB/s is its real speed): [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 36.8038 s, 71.2 MB/s Buffers: 14444 kB Rereading the data shows that they are cached somewhere but not in buffers of the VM. Also the speed increased to "only" 500MB/s. The VM has 4GB of RAM (more that the test file) [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 5.16016 s, 508 MB/s Buffers: 14444 kB [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 5.05727 s, 518 MB/s Buffers: 14444 kB Now lets mount the FS on /dev/vdd and try the dd again: [root@localhost ~]# mount /dev/vdd /mnt/tmp [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 4.68578 s, 559 MB/s Buffers: 2574592 kB [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 1.50504 s, 1.7 GB/s Buffers: 2574592 kB While the first read was the same, all 2.6GB got buffered and the next read was at 1.7GB/s. And when I unmount the device: [root@localhost ~]# umount /mnt/tmp [root@localhost ~]# cat /proc/meminfo | grep Buffers Buffers: 14452 kB [root@localhost ~]# dd if=/dev/vdd of=/dev/null bs=256k count=10000 ; cat /proc/meminfo | grep Buffers 2621440000 bytes (2.6 GB) copied, 5.10499 s, 514 MB/s Buffers: 14468 kB The bcache was disabled while testing and the results are same on faster (newer) HDDs and on SSD (except for the initial read speed of course). To sum it up. When I read from the device via dd first time, it gets read from the disk. Next time I reread it gets cached in the host but not in the guest (thats actually the same issue, more on that later). When I mount the filesystem but try to read the device directly it gets cached in VM (via buffers). As soon as I stop "using" it, buffers are discarded and the device is not cached anymore in the VM. When I looked into buffers value on the host I realized that the situation is the same. The block I/O gets buffered only when the disk is in use, in this case it means "exported to a VM". On host, after all the measurement done: 3165552 buffers On the host, after the VM shutdown: 119176 buffers I know it is not important as the disks will be mounted all the time but I am curious and I would like to know why it is working like this.

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• Firefox extension to save tabs?

  - by emzero

  I'm looking for some Firefox (4 or 5) extension to save a group of tabs (better if can be done directly in Panorama view). What I mean by "Save tabs" is not to restore them when Firefox starts. I always have the browser opened and a LOT of tabs (work and personal life related) eating my RAM. So when I'm not working, I would want a way to save those tabs but keep them closed while I still use Firefox. So when I have to start working again, I will restore that saved tabs back again. I know I could use something like Read It Later, but I really need a way to say "hey, save this group of tabs and close them". RIL makes me do it per tab, which is annoying since I'm used to have A LOT.

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• postfix concurrency limit with round robin dns

  - by goose

  Take the following internal round robin dns setup mymta.com. IN A 172.31.1.1 mymta.com. IN A 172.31.1.2 mymta.com. IN A 172.31.1.3 mymta.com. IN A 172.31.1.4 mymta.com. IN A 172.31.1.5 mymta.com. IN A 172.31.1.6 mymta.com. IN A 172.31.1.7 mymta.com. IN A 172.31.1.8 mymta.com. IN A 172.31.1.9 mymta.com. IN A 172.31.1.10 Now assume the following postfix setup (assume these are the only tweaks from defaults in debian package) main.cf: smtp_connection_cache_destinations = mymta.com smtp_connection_cache_reuse_limit = 750 smtp_destination_concurrency_limit = 75 transport * :[mymta.com] I would expect 75 concurrent connections spread across the 10 A records I've set in DNS. However I'm seeing more than a few hundred connections to mymta.com and I'm wondering if Postfix is "smart" enough to set up 75 concurrent connections for each IP address. Thoughts?

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• Per-machine decentralised DNS caching - nscd/lwresd/etc

  - by Dan Carley

  Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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• Which browsers support Window's Low Integrity level?

  - by Ian Boyd

  Normally i like running ie, but it's rendering speed at high-dpi is poor. More recently i've switched to Chrome, but it does not support high-dpi displays. i'm interested in trying other browsers, but they must support protected mode. Are there any other browsers, besides IE and Chrome, that support Mandatory Integrity Levels (i.e. protected mode)? Browsers that i do know about: Browser Protected Mode High-dpi Aware ============== =============== ============== Internet Explorer Yes Yes Chrome Yes No Firefox No No Opera No No Are there any other? And just as an fyi, the clear, unambiguous, non-argumentative, non-subjective, question is: Are there any browsers, aside from Internet Explorer, available for Windows, that run at the Windows Low Mandatory integrity level, and support high-dpi (i.e. non-96 dpi) displays?

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• Automatically download files in Internet Explorer without getting prompted to Save / Cancel?

  - by dimbasint

  I am currently using IE7 with XP SP3. When a webpage download with unknown file type loads, I get a prompt asking me what I want to do with the file. My options are FIND SAVE CANCEL. How do I make it so that I don't get this popup prompt, but Internet explorer automatically downloads the file into a directory I choose without asking? PS. I have already tried Tools Internet Options Security Internet Custom Level Downloads Disable/Enable/Enable, but this doesn't help. Thanks for the reply. Unfortunately I have to use IE. I'm using it in connection with other proprietary software based on IE and its settings. And yes I'm aware it's not a great browser. (This is not for strictly personal use in the browsing sense. )

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• Dual boot new laptop win 7 / ubuntu 12.04 - 750gb + 32gb SSD

  - by Alex Waters

  I have just purchased a new HP dv7t-7000 and I would like to run Windows 7 / Ubuntu. How do I setup the dual boot? Can I install both operating systems with an 8gb USB drive? Can I still make use of the 32gb SSD? I'm unfamiliar with the efficacy of using an SSD for caching with a 750gb 7200rpm sata 3 drive. I can only see using it for windows 7 - which I have installed in order to play games. Thank you!

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• Squid closing the connection on long HTTP GET requests

  - by Rhys

  Hello, 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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• My browsers won't use my full screen resolution, IE different

  - by curtis

  My screen resolution is actually 3200x1800, but when I'm in a browser it acts like I have a smaller resolution. How do I get my browsers to use my full resolution? On Chrome it's using 1280x720, and on IE it's using 1600x900. According to whatismyscreenresolution.com, which is showing different values for different browsers. I took a screenshot of them and verified that my resolution is 3200x1800 as that is the pixels in the bitmap. I'm on a laptop with no monitor plugged in. My zoom in both browsers is at 100%. I've tried zooming out below 100% but then the text is unreadable and pixellated. I've tried restarting. Windows 8.1. I've tried the chrome extension OptiZoom and it does nothing. document.body.clientWidth gives 1247, and I want it to give 3200.

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• Chrome - SSL Security issue on Windows platforms?

  - by al nik

  Fortify.net is a service that displays what's the currently encryption key used by your browser in a https connection. If I browse this site with Chrome 4.1.249.1042 in WinXp SP3 the key used is RC4 cipher, 128-bit key This encryption is weak, and it's the one used by old browsers like IE6. Chrome works fine on Fedora9 and it uses AES cipher, 256-bit key as more modern browsers do (i.e.Firefox) I consider this a security issue. I'm considering to switch back to Firefox in Windows. Do you know if it's possible to change the default encryption key in Chrome?

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• How to configure squid for retrieving (and caching) directly my static resources?

  - by fabien7474

  I have an Apache/Tomcat/Spring tc Server running on CentOS EC2 VM. I would like to install squid on the same machine as a proxy for retrieving (directly i.e. without forwarding the request to Apache/Tomcat) and caching static content ONLY identified by URIs : /images, /css or /js. Other URIs should be forwarded to the normal Web Server and not cached. Since I am a newbie, I didn't find from squid documentation how to configure squid for this desired behavior (and if it is even possible). Could you please help me and tell me how should I configure squid for this purpose? Thank you.

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• Varnish + Tomcat vs Apache + mod_jk + Tomcat

  - by Adrian Ber

  Does anyone have some comparison data in terms of performance for using in front of Tomcat either Varnish or Apache with mod_jk. I know that AJP connector suppose to be faster than HTTP, but I was thinking that in combination Varnish which is lighter and highly optimized could perform better. There is also the discussion between static resources (which I think will perform faster with Varnish than Apache, even with mod_cache) and dynamic pages.

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