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• Are applications optimized for XenApp?

  - by damitamit

  Our IT dept are about to deploy virtualized apps using Citrix XenApp. One of these apps will be Dynamics AX 4.0 SP2, a ERP client (which I develop on). They have supposedly reached a roadblock because an external 'Dynamics AX Consultant' has told our IT Dept that Dynamics 4 will not work optimally on Citrix and will run very slow because it is not optimized for Citrix. We have it running in a Test environment now and seems ok. They have been told that the only 'solution' is to upgrade to Dynamics AX 2009 where supposedly this problem as been fixed. (not a small task for my team!) When I heard about this, I was quite surprised. From my brief knowledge of Citrix, I thought it would be application independent. How does the citrix app virtualization work, in that a particular app would work better than others on citrix? Would the speed of the virtualized app not just depend on the resources/network connection the citrix server has? FYI, Dynamics AX is a 3-tier client/server system, so the client will be accessing a AOS application server, which then accesses the database. Please enlighten me :)

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• Remote desktop connection to network printer

  - by andand

  I'm trying to print a document from a remote WinXP machine to a network printer I use on a local Win7 machine using Remote Desktop. The network printer does not appear in the list of those available on the WinXP box. In more detail, the local machine runs Windows 7 (no admin rights) and connects to a network printer managed by a print server (i.e. not using a local TCP/IP Port). I have access to a Windows XP host on a separate network which I access using Remote Desktop. I would like to have print requests from the remote XP box forwarded to the network printer I use on the Windows 7 machine. The XP machine cannot access the print server I use on the Win7 machine nor can it create a TCP/IP port to connect directly to the printer (network configuration issues). After having consulting the KB312135 I confirmed the "Printers" option was selected in the Remote Desktop Client, Local Resources Tab, yet the network printer does not appear on the list of available printers on the XP box. Is this a lost cause or is there something else I haven't managed to locate yet?

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• cPanel web servers mounting home partition to a NAS or SAN

  - by Scott

  I currently have 2 cPanel web servers that are little 1RU dual cpu quad core xeons. They have a lot of resources for processing and handling web requests, and never exceed more than 10% cpu usage. They also have plenty of RAM. The problem is though that they both have RAID 1 160Gb SAS hard disk drives in them that are 75% full, and growing by the day. I didnt think that the amount of disk usage would be so high, but due to the nature of the sites hosted, this has become an issue. The easy fix would be just to upgrade the hard drives to something bigger (probably not of the SAS variety), but I am thinking of keeping the current machines as "processing servers" and buying a central "storage server" with about 12TB of storage. The /home/ partition on each of the 1RU servers would be mounted to a NAS or SAN point on this central storage server. My questions are: - Has anyone got a cPanel setup where they mount /home/ to a NAS or SAN elsewhere? If so, can you provide details as to what you did and how it went :) - Any recommendations on networking? Is gigabit ethernet enough? Is TCP/IP going to be a noticable performance problem? Anyone used a TOE key? - Anyone benchmarked or had any performance issues with SAN over NAS? Any help greatly appreciated. Scott

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• Virtual Lan on the Cloud -- Help Confirm my understanding?

  - by marfarma

  [Note: Tried to post this over at ServerFault, but I don't have enough 'points' for more than one link. Powers that be, move this question over there.] Please give this a quick read and let me know if I'm missing something before I start trying to make this work. I'm not a systems admin professional, and I'd hate to end up banging my head into the wall if I can avoid it. Goals: Create a 'road-warrior' capable star shaped virtual LAN for consultants who spend the majority of their time on client sites, and who's firm has no physical network or servers. Enable CIFS access to a cloud-server based installation of Alfresco Allow Eventual implementation of some form of single-sign-on ( OpenLDAP server ) access to Alfresco and other server applications implemented in the future Given: All Servers will live in the public internet cloud (Rackspace Cloud Servers) OpenVPN Server will be a Linux disto, probably Ubuntu 9.x, installed on same server as Alfresco (at least to start) Staff will access server applications and resources from client sites, hotels, trains, planes, coffee shops or their homes over various ISP, using their company laptops or personal home desktops. Based on my Research thus far, to accomplish this, I'll need: OpenVPN with Bridging Enabled to create a star shaped "virtual" LAN http://openvpn.net/index.php/open-source/documentation/miscellaneous/76-ethernet-bridging.html A Road Warrior Network Configuration, as described in this Shorewall article (lower down the page) http://www.shorewall.net/OPENVPN.html Configure bridge addressesing (probably DHCP) http://openvpn.net/index.php/open-source/faq.html#bridge-addressing Configure CIFS / Samba to accept VPN IP address http://serverfault.com/questions/137933/howto-access-samba-share-over-vpn-tunnel Set up Client software, with keys configured for access (potentially through a OpenVPN-Sa client portal) http://www.openvpn.net/index.php/access-server/download-openvpn-as/221-installation-overview.html

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• How can I get an AdWords ad to show up for a specific term ASAP?

  - by Eric

  I have a very specific situation... I have a client who has a site, backed by a celebrity, selling a comment product.... so imagine my site is all about "Martha Stewart used cars" (that's not it-- but you get the idea). My client wants to see their site show up ASAP in Google search results. While I'm waiting for organic search to kick in and recognize my site, index it properly, etc, I want to buy some adwords for keywords like "Martha Stewart used cars" and "Martha Stewart used car" and so forth and have the ads show up on the 1st page of search results. I've done this. The problem is that many, many other advertisers have set up ads on the keyword "used cars" so my Martha-specific ads never are shown. Even when I bid specifically on the keyword phrase "Martha Stewart used cars" and I enter that directly into Google, it doesn't show my ad. SO MY QUESTION.... how/what can I do to get my ads to show... or really, can I do anything else to get my client's site to show on the result page? (I'm not interested in anything black-hat or illegal; I'm just trying to throw some resources at this situation so when those folks looking SPECIFICALLY for "Martha Stewart used cars" will get to the site quickly.) thanks-- Eric

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• Ubuntu xrandr rotate issue

  - by user83544

  I've just bought a second monitor for my PC which happens to be a pivot monitor. I've already read lots of forums related to my problem but haven't come across a solution - I have the same symptoms as dozens of posts but no matter whatever I try it just doesn't work. I've already changed the xorg.conf file and added in the device section just under Driver "nvidia" the following for my second monitor: Option "RandRRotation" "on" When I save and reboot I try to rotate my screen with the nvidia X server settings by choosing the second monitor and clicking either "left" or "right" for the rotation. It immediately exits the nvidia settings window and does nothing. I tried within the terminal by typing: xrandr -o right I get the following error: X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 154 (RANDR) Minor opcode of failed request: 2 (RRSetScreenConfig) Serial number of failed request: 14 Current serial number in output stream: 14 I actually manage to rotate it with Option "Rotate" "CCW" instead of "RandRRotation". The problem with this solution is that you get the second monitor in the right position, but any window you open on that screen is practically unchangeable. You can't change the size nor move it, making it useless for reading PDFs, which is the main reason why I bought this second screen to help me write my thesis. Any help is really appreciated. sudo lshw -c video hiram@hiram-linux:~$ sudo lshw -c video *-display description: VGA compatible controller product: nVidia Corporation vendor: nVidia Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller bus_master cap_list rom configuration: driver=nvidia latency=0 resources: irq:16 memory:f8000000-f9ffffff memory:d8000000-dfffffff memory:d4000000-d7ffffff ioport:dc00(size=12 memory:fbd80000-fbdfffff

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• cURL hangs trying to upload file from stdin

  - by SidneySM

  I'm trying to PUT a file with cURL. This hangs: curl -vvv --digest -u user -T - https://example.com/file.txt < file This does not: curl -vvv --digest -u user -T file https://example.com/file.txt What's going on? * About to connect() to example.com port 443 (#0) * Trying 0.0.0.0... connected * Connected to example.com (0.0.0.0) port 443 (#0) * SSLv3, TLS handshake, Client hello (1): * SSLv3, TLS handshake, Server hello (2): * SSLv3, TLS handshake, CERT (11): * SSLv3, TLS handshake, Server key exchange (12): * SSLv3, TLS handshake, Server finished (14): * SSLv3, TLS handshake, Client key exchange (16): * SSLv3, TLS change cipher, Client hello (1): * SSLv3, TLS handshake, Finished (20): * SSLv3, TLS change cipher, Client hello (1): * SSLv3, TLS handshake, Finished (20): * SSL connection using DHE-RSA-AES256-SHA * Server certificate: * subject: serialNumber=jJakwdOewDicmqzIorLkKSiwuqfnzxF/, C=US, O=*.example.com, OU=GT01234567, OU=See www.example.com/resources/cps (c)10, OU=Domain Control Validated - ExampleSSL(R), CN=*.example.com * start date: 2010-01-26 07:06:33 GMT * expire date: 2011-01-28 11:22:07 GMT * common name: *.example.com (matched) * issuer: C=US, O=Equifax, OU=Equifax Secure Certificate Authority * SSL certificate verify ok. * Server auth using Digest with user 'user' > PUT /file.txt HTTP/1.1 > User-Agent: curl/7.19.4 (universal-apple-darwin10.0) libcurl/7.19.4 OpenSSL/0.9.8l zlib/1.2.3 > Host: example.com > Accept: */* > Transfer-Encoding: chunked > Expect: 100-continue > < HTTP/1.1 100 Continue

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• java.lang.OutOfMemoryError: unable to create new native thread

  - by Brad

  I consistently get this exception when trying to run my Junit tests on my mac: java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:658) at java.util.concurrent.ThreadPoolExecutor.addIfUnderMaximumPoolSize(ThreadPoolExecutor.java:727) at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:657) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:197) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:184) at java.security.AccessController.doPrivileged(Native Method) at com.google.appengine.tools.development.ApiProxyLocalImpl.doAsyncCall(ApiProxyLocalImpl.java:172) at com.google.appengine.tools.development.ApiProxyLocalImpl.makeAsyncCall(ApiProxyLocalImpl.java:138) The same set of unit tests pass perfectly fine on ubuntu and windows. Some information about my system resources on the mac: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 266 virtual memory (kbytes, -v) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode) The reason I dont think this is an application issue is because the same tests pass in different environments. I have tried setting heap to 1024m, 512m and setting the stack to 64k and 128k (and each of these combinations) with no luck. My open files was originally 256 and I have bumped this to 1024. I have been googling around for a bit and all posts say to decrease heap size and increase stack size but that doesnt seem to help. Anyone have anymore ideas? EDIT: Here are is some environment information on my ubuntu box: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)

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• 16TB Volumes and SNMP On Windows

  - by John K

  As volumes larger than 16TB became more common, it was recognized that the 32 bit value used to report disk size and usage within the standard "HOST-RESOURCES" MIB in SNMP was not large enough to report the proper disk size. Net-SNMP seems to have addressed this issue by simply manipulating the value of "AllocationUnits" to maintain a 32 bit value for disk utilization (since total disk size/usage is equal to the 32 bit space value times the allocation unit), to allow for the calculation of a volume larger than 8/16TB. Presuming you don't have any reporting interest in the allocation unit, this seems like a fine solution. https://bugzilla.redhat.com/show_bug.cgi?id=654384 Window's built in SNMP service, however, seems to continue to suffer from this error, simply reporting the modulo of the used/assigned disk space, resulting in inaccurate disk size reporting. Is there a way to enable Windows to correctly report disk usage for volumes over 16TB? We attempted to simply install Net-SNMP 5.5 x64 and disable Windows SNMP service entirely, however this unfortunately did not fix our issue. I've seen people in the Cacti community mention simply scripting out a solution. Unfortunately, we're using Observium for quick and basic systems monitoring. If the issue can't be correct on the Window's side, can Observium be made to report custom MIBs?

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• Bare-metal virtualisation for the desktop

  - by Andrew Taylor

  Hi, Does anyone have any knowledge about bare-metal virtualisation products? I'm interested in building a new desktop machine for home, I've been looking at the Intel Quad Core processors and I'd like to put 8GB of RAM in there, but, it got me thinking about making the most out of the available resources. I thought if I could get a good 64bit machine, put some bare-metal virtualisation on, then have a primary system, I'd also be able to bring up some extra virtualised systems as and when I needed. I know most of the bare metal systems are designed for the server market, but, is there anything out there that works well for a desktop. What are the caveats? I presume I won't be able to make the most out of any video cards I could buy, what about just getting a decent screen resolution, will this be a problem? I run a single 24" screen. What about DVD/CD writing, is this possible? I'd like to re-rip my CD collection, I was hoping the quad 64Bit goodness would help me out with the encoding. I currently use a Mac and couldn't go back to windows so that leaves Linux, I was thinking a primary OS of ubuntu. Does this make a difference? Thanks Andrew

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• Eclipse: Slow startup time

  - by ct2k7

  Hello, I've got Eclipse 3.6.1 on my MacBook Air (2010), and I'm getting slowish startup times. Well, slow, compared to my Desktop, which is somewhat less powerful and a few years old). The startup generally takes 15 seconds, and of this, 4 is spent just on the Eclipse splash screen, before Eclipse loads anything. No projects are open at startup. Here's a copy of my eclipse.ini. -startup ../../../plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar --launcher.library ../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx.x86_64_1.1.1.R36x_v20100810 -showsplash org.eclipse.platform --launcher.XXMaxPermSize 512m --launcher.defaultAction openFile -vmargs -Xms256m -Xmx512m -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -Dosgi.requiredJavaVersion=1.6 -Xverify:none -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -XX:+UnlockExperimentalVMOptions -XX:+AggressiveOpts -XX:+StringCache -XX:+UseFastAccessorMethods -XX:+UseLargePages -XX:LargePageSizeInBytes=4m -XX:AllocatePrefetchLines=1 -XX:AllocatePrefetchStyle=1 -Dide.gc=true The problem doesn't seem to be related to plugins - I've disabled the ones which I don't need, and regardless of this configuration or whether all of them are selected on startup, it only takes 1second to load the plugins. I'm running Eclipse 3.6.1 Cocoa x64 build (vanilla) with the Zend Studio plugin. The machine has 4GB RAM, an SSD with over 64% free space, 1.6GHz (4MB L2 Cache). OS is Mac OS X 10.6.6, latest Java available, 1.6. For comparison, my Desktop, an old P4 3GHZ (512K L2 Cache) with a 7200RPM drive, under 40% free space, Eclipse (same config) loads in under 7 seconds, consistently. Note, this one is a Windows machine, with latest Java installed.

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• NFS high CPU usage

  - by user269836

  Hello, I have a very strange issue. I have next server: Intel(R) Xeon(TM) MP CPU 3.16GHz cat /proc/cpuinfo | grep proce | wc -l 8 free -m total used free shared buffers cached Mem: 28203 27606 596 0 10789 9714 -/+ buffers/cache: 7103 21100 Swap: 24695 0 24695 RAID card *-storage description: RAID bus controller product: MegaRAID vendor: LSI Logic / Symbios Logic physical id: 7 bus info: pci@0000:13:07.0 logical name: scsi2 version: 01 width: 32 bits clock: 66MHz capabilities: storage pm bus_master cap_list rom configuration: driver=megaraid latency=32 resources: irq:134 memory:d8ff0000-d8ffffff(prefetchable) memory:df600000-df60ffff(prefetchable) HDD: 10x148Gb SCSI U320 15k - RAID5 /dev/sdb1 807G 674G 93G 88% /storage /dev/sdb1 /storage ext4 defaults,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,noatime,nodiratime,noacl,errors=remount-ro 0 1 network cards ethtool -i eth0 driver: tg3 version: 3.116 firmware-version: 5704-v3.36, ASFIPMIc v2.36 bus-info: 0000:10:02.0 ethtool -i eth1 driver: tg3 version: 3.116 firmware-version: 5704-v3.36, ASFIPMIc v2.36 bus-info: 0000:10:02.0 ifconfig bond0 Link encap:Ethernet HWaddr 00:0f:1f:ff:d6:4d inet addr:192.168.15.71 Bcast:192.168.15.255 Mask:255.255.255.0 inet6 addr: fe80::20f:1fff:feff:d64d/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:1062818202 errors:0 dropped:3918 overruns:0 frame:0 TX packets:1041317321 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:10000 RX bytes:258867684559 (241.0 GiB) TX bytes:396569192650 (369.3 GiB) this server running only nfs-kernel-server uname -a Linux nas2-backup 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux Debian 6. What do I have, once per day or two, LA goes up, it can be reached around LA: 40 but if I do: nfs-kernel-server restart. Every thing is OK. But on the next day or a little bit later, LA goes up again. Servers are connected to d-link dgs 1016d with 24 GBits ports. I have tried everything to find out what the problem is. Why it's happening, but still I can not resolve this issue. Any ideas on what is happening here?

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• What could be causing SVCHost to leak handles?

  - by Goz

  I have a problem that has been causing me all sorts of grief recently. SVCHost appears to be leaking resources all over the shop. This is the SVCHost run with the arguments "-k netsvcs". At the moment it is sitting at around 5,700 Handles being used. Before I rebooted the machine it was sitting at around 33,000 handles! This higher number has been causing me large problems as my software, thus, fails to obtain the handles it needs (The software tries to create around 2000 handles). I'm totally at a loss as to what is going wrong. IF anyone could help me stop this happening it would be much appreciated. I'm running on XP with SP3. Edit: I tracked this problem down to the WMI system. I'm not sure why or how the problem was occurring. Basically I used "sc change" to move it into its own process and suddenly everything seems to be fine. I'm not entirely sure what is going on ...

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• Office 365 - Outlook shows Global Address List clicking "Rooms" during a meeting request

  - by TheCleaner

  This appears to be a "known" issue, but apparently no fix for it. However, I've been impressed before at the tenacity of the experts here to figure out an answer/fix. ISSUE When booking a New Meeting in Outlook (2013 or 2010) and choosing the Rooms button: The default list that opens is the Offline Global Address List: Which means a user has to change from the Offline Global Address List to the All Rooms list as shown here in order to easily pick from the list of actual rooms/resources: This isn't the default however for On-Premise Exchange servers. They default "correctly" to the All Rooms list when you click the Rooms button in the meeting request. While the option of using the Room Finder is there and does work, users have to know to click the Room Finder choice and it doesn't fix the actual root issue here. MY RESEARCH A few links I've found: http://community.office365.com/en-us/forums/158/t/41013.aspx http://community.office365.com/en-us/forums/148/p/24139/113954.aspx http://community.office365.com/en-us/forums/172/t/58824.aspx It was suggested that it might be that the "msExchResourceAddressLists attribute has incorrect value set". I checked my config by running: Get-OrganizationConfig | Select-Object ResourceAddressLists and the output was what it should be: ResourceAddressLists -------------------- {\All Rooms} QUESTION Does anyone have a fix that will make the All Rooms list be the default list when clicking the Rooms button in Outlook when using Office 365 / Exchange Online?

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• Compiling Gearman PHP Library for CentOS 5.8

  - by Andrew Ellis

  I've been trying to get Gearman compiled on CentOS 5.8 all afternoon. Unfortunately I am restricted to this version of CentOS by my CTO and how he has our entire network configured. I think it's simply because we don't have enough resources to upgrade our network... But anyways, the problem at hand. I have searched through Server Fault, Stack Overflow, Google, and am unable to locate a working solution. What I have below is stuff I have pieced together from my searching. Searches have told said to install the following via yum: yum -y install --enablerepo=remi boost141-devel libgearman-devel e2fsprogs-devel e2fsprogs gcc44 gcc-c++ To get the Boost headers working correctly I did this: cp -f /usr/lib/boost141/* /usr/lib/ cp -f /usr/lib64/boost141/* /usr/lib64/ rm -f /usr/include/boost ln -s /usr/include/boost141/boost /usr/include/boost With all of the dependancies installed and paths setup I then download and compile gearmand-1.1.2 just fine. wget -O /tmp/gearmand-1.1.2.tar.gz https://launchpad.net/gearmand/1.2/1.1.2/+download/gearmand-1.1.2.tar.gz cd /tmp && tar zxvf gearmand-1.1.2.tar.gz ./configure && make -j8 && make install That works correctly. So now I need to install the Gearman library for PHP. I have attempted through PECL and downloading the source directly, both result in the same error: checking whether to enable gearman support... yes, shared not found configure: error: Please install libgearman What I don't understand is I installed the libgearman-devel package which also installed the core libgearman. The installation installs libgearman-devel-0.14-3.el5.x86_64, libgearman-devel-0.14-3.el5.i386, libgearman-0.14-3.el5.x86_64, and libgearman-0.14-3.el5.i386. Is it possible the package version is lower than what is required? I'm still poking around with this, but figured I'd throw this up to see if anyone has a solution while I continue to research a fix. Thanks!

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• APACHE - PHP - Bounce emails

  - by user1179459

  I want to improve our mail server lists by handling all the bounces we get in our websites. I have a website which has over 8000+ users and another website which as over 1500+ users, they are emailed various notifications every second, ie. job alerts, email alerts, I am using POP connections with EXIM on APACHE server, most scripts are based on PHP language generates email on the fly. Problems i have But some users has registered long time ago and now quite few has bounce email address Some users register with dummy emails like [email protected] which never existed but a valid email address, any chance of stopping this without asking them login to the email account and clicking links which dont work most times.. (too annoying to the end user) Server is sending unnecessary emails can be avoided if i know they dont exists ? Solutions i need to have Is there a way i can download the bounce email list somewhere (WHM/Cpanel), i know exim mail has it but its not readable (i need a file like CSV or something similar to scan them over and write a php script to delete the users from the database ?) I need to know if there is any function in the PHP that can check the existence of the email address on the fly ? so that i can set the email send function in the mailer class to check before it sends out. On the server will bouncing emails are going to eatup lots of server resources ? like memory/cpu on processing them ? or are they are minimal where we dont have to worry about this at all ? May be a opensoruce or linux software to capture them and view them in a report basis and cleaning them up ? I am not a linux expert or server admin but i do lot of PHP coding, so please be descriptive of the solutions specially if they are linux commands Thank you!

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• Throughput; capacity planning help for C10K like design

  - by z8000

  I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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• Recommendations for colocation in the US

  - by Emil

  Hello serverfault I work for a European media company and we are currently looking for colocation in the US. I know the European market quite well unfortunately that is not the case for the US. I'm hoping for you guys to help me out a bit with a few questions, it would be much appreciated! I am looking for a data center that can deliver a high level of availability (tier 3 or better). The installation will be fairly large so capacity is important. Good internet connectivity/carrier presence. However most important is good customer support, skilled dedicated and responsive technical staff, since we won't have tech staff close by. I'm looking for a small and fast moving company that target internet businesses rather than big old enterprise hosting. What locations should we go for given that we want to reach all of the US from a single site and still maintain decent latency? (do we need east and west coast?) Where are the main internet hubs and should you try and get as close as possible? Are there any good online resources I should look at? Where do the large scale internet/media services colocate? Lastly I would be very happy to get some actual recommendations for companies to talk to P.S I'm happy to return the favor if anyone has question regarding data centers and colocation in Europe.

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• Can I get ethernet out of my Verizon FIOS set-top box?

  - by Tom Hughes

  Setup: my home network is long & skinny, and the FIOS-connected router is all the way at one of the apartment. At the other end, far away (and a floor higher) is my HD TV, which gets a cable-TV signal from a Verizon set-top box that is coax-connected back to the FIOS on-premises equipment. Wi-Fi won't work, the apartment is too stretched out, with old, thick walls and floors. Goal: I think there are three ways to get ethernet back to where the HD TV is: 1) run a cable! this isn't crazy but isn't cheap either (my building won't let me do it, it involves hiring an electrician because the cable would run partly through the public hallway ceiling) 2) split the coax near the TV and put in... a MoCA device? 3) somehow tease the set-top box, which has an RJ-11 (ethernet) port on the back, to give me network access. Question: any other choices? and, is one choice better than the others? #3 is by far the most desirable because it would involve the least wiring -- but I can't find any resources to help make it happen. #2 is a bit scary, I don't want to degrade service to the TV or anywhere else for that matter.

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• How to set up that specific domains are tunneled to another server

  - by Peter Smit

  I am working at an university as research assistant. Often I would like to connect from home to university resources over http or ssh, but they are blocked from outside access. Therefore, they have a front-end ssh server where we can ssh into and from there to other hosts. For http access they advise to set up an ssh tunnel like this ssh -L 1234:proxyserver.university.fi:8080 publicsshserver.university.fi and put the proxy settings of your browser to point to port 1234 All nice and working, but I would not like to let all my other internet traffic go over this proxy server, and everytime I want to connect to the university I have to do this steps again. What would I like: - Set up a ssh tunnel everytime I log in my computer. I have a certificate, so no passwords are needed - Have a way to redirect some wildcard-domains always through the ssh-server first. So that when I type intra.university.fi in my browser, transparently the request is going through the tunnel. Same when I want to ssh into another resource within the university Is this possible? For the http part I think I maybe should set up my own local transparent proxy to have this easily done. How about the ssh part?

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• Referencing groups/classes from Puppet dashboard in my site manifest

  - by Banjer

  I'm using Puppet Dashboard as my ENC and I'm not sure how to reference or use class and group classifications from /etc/puppet/manifests/site.pp. I have two groups defined in the dashboard: CentOS6 and SLES11. What should my site.pp look like if I want to include a certain list of modules in the CentOS6 group and a certain list of modules in the SLES11 group? I'm trying to do something like this: # /etc/puppet/manifests/site.pp node basenode { include hosts include ssh::server include ssh::client include authentication include sudo include syslog include mail } node 'CentOS6' inherits basenode { include profile } node 'SLES11' inherits basenode { include usrmounts } I have OS-specific case statements within my modules, but there are some modules that will only be applied to a certain distro. So I suppose I have two questions: Is this the best way to apply modules/resources in an OS-specific manner? Or does the above make you want to vomit? Regardless of #1, I'm still curious as how to reference classes, groups, and nodes from Dashboard within my manifests. I've read the External Nodes doc, but I'm not seeing how they correspond to manifests. Thanks all.

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• Identifying Hard Drive as performance bottleneck for desktop machines

  - by Programming Hero

  I'm working in a development team where we all use laptops so we can work in multiple locations. These laptops are proving notoriously slow for development work, but at a glance they all look to have the specification for a much faster experience: CPU - Intel Core 2 Duo T7500 Memory - 2GB of RAM We all experience the biggest delays when the hard-drives are being accessed, particularly when swap-files are being thrashed. After doing a little bit of profile, a colleague discovered that our HDDs are seeing Read/Write speeds of about 10MB/sec. This seems abnormally low and we believe it the cause of the problem. Sensibly (though somewhat annoyingly) our business wont blow money on faster drives just to see if it fixes the problem; we need to illustrate this is definitely the problem and that buying some solid-state drives will make it go away. I need some way of showing how 90% of the system resources aren't being used over the course of a day, and that whenever there is utilization, it's all in HDD reads or writes. Are there any tools I could use to provide this information? Does it seem likely the problem is going to be fixed by a faster drive? Should I be looking for alternatives?

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• how to maitain the authentication details/passwords in a 50 people company

  - by sabya

  What is the process that you guys follow to maintain authentication details like login ids and passwords? There will be definitely some shared passwords. So, the target is to minimize the impact when someone is leaving the company. By "shared password", I mean, the account, which is shared among multiple people in the company. The issues that the process should address are: - Affected areas. Quickly find the resources to which the leaving user was having access to. Forgetting password. What happens if a user forgets an authentication details? How does he get it? I think he shouldn't ask a team mate. I mean no-verbal communication. Find dependencies of a resource. Suppose I am changing the password for a mail account, which is getting used by some automated scripts to send mails. Here, the scripts are dependent on the mail account, so changing the password of the mail account means we have to change the password in the script too. So, how do find all the dependencies of a resource? I'd prefer a process which addresses these issues. But you can also recommend products which are open source and not hosted. I have gone through PassPack, but they don't solve #4. There is a similar question here. But that does not exactly answer my question.

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• Apache2: 400 Bad Reqeust with Rewrite Rules, nothing in error log?

  - by neezer

  This is driving me nuts. Background: I'm using the built-in Apache2 & PHP that comes with Mac OS X 10.6 I have a vhost setup as follows: NameVirtualHost *:81 <Directory "/Users/neezer/Sites/"> Options Indexes MultiViews AllowOverride None Order allow,deny Allow from all </Directory> <VirtualHost *:81> ServerName lobster.dev ServerAlias *.lobster.dev DocumentRoot /Users/neezer/Sites/lobster/www RewriteEngine On RewriteCond $1 !^(index\.php|resources|robots\.txt) RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L,QSA] LogLevel debug ErrorLog /private/var/log/apache2/lobster_error </VirtualHost> This is in /private/etc/apache2/users/neezer.conf. My code in the lobster project is PHP with the CodeIgniter framework. Trying to load http://lobster.dev:81/ gives me: 400 Bad Request Normally, I'd go check my logs to see what caused it, yet my logs are empty! I looked in both /private/var/log/apache2/error_log and /private/var/log/apache2/lobster_error, and neither records ANY message relating to the 400. I have LogLevel set to debug in /private/etc/apache2/http.conf. Removing the rewrite rules gets rid of the error, but these same rules work on my MAMP host. I've double-checked and rewrite_module is loaded in my default Apache installation. My http.conf can be found here: https://gist.github.com/1057091 What gives? Let me know if you need any additional info. NOTE: I do NOT want to add the rewrite rules to .htaccess in the project directory (it's checked into a git repo and I don't want to touch it).

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• SQL Server 2008 second instance times out when logging in -- but only the first time?

  - by Kromey

  This is a strange one that has plagued me for a while now. When logging in to the second instance of SQL Server 2008 on one of our database servers, we get a timeout error: Cannot connect to servername\mssqlserver2. Additional information: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. (Microsoft SQL Server)") (This is the error message when trying to connect with Microsoft SQL Server Management Studio; other tools experience the same error, but of course say it in different ways.) Immediately re-attempting to log in works just fine, so whatever the cause it's ephemeral! This happens regardless of user or authentication type (both Windows and SQL Server authentication methods are supported on this instance). What's even weirder, though, is that the first instance on this server has never once demonstrated this problem. Server is a Windows Server 2008 R2 virtual server, hosted in Microsoft Hyper-V (host is likewise Server 2008 R2). The server has 2GB of RAM, and seems to regularly be using 90% of that -- could low memory be the cause of this issue? I could see this second instance -- which is not used very often yet -- being swapped out to disk, and then taking too long to load back into memory to respond in time to the connection request, but I'd rather have more than just my own hunch before I go scheduling a downtime for this server (the first instance is used regularly) and then just throwing extra resources at it in the blind hope that the problem goes away.

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