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  • What "pieces" are needed in order to set up a cluster of physical servers?

    - by Chris Dutrow
    Background: Currently, we use Rackspace cloud servers. We have no intention to stop using them, but would like to look into setting up a cluster of physical servers (probably desktop computers in the $400 range with 8gb memory each) to offset some of our load and work as a secondary, more powerful, less reliable system. To put things in perspective, we can buy comparable desktop computers for the same price as we pay in one month to rent them on Rackspace Cloud. I understand that this is generally a dumb idea. However, in this particular instance, the server cluster is needed for its computation power. It is not mission-critical, it does not host a consumer-facing website, and if it goes down for a day or two, its not really a problem. Currently, we have access to business class verizon fios. If I understand correctly, we can get at least 25 dedicated IP addresses with this service, this should be enough. Requirements: Each server runs Linux Centos 6.3 Some of the servers run Python and execute processes from a task queue (Redis or RabbitMQ) Some of the servers are capable of serving static files and Python driven REST APIs Some of the servers host a Cassandra database cluster One or more of the servers are a Redis database servers One or more of the servers are PostgreSQL servers Questions: What kind of router or switch is needed? We would like the computers to be able to communicate effectively with each other via internal IP addresses. This is especially important for communicating with servers hosting Redis that need to be able to respond to requests very quickly. Are there special switches or routers that need to be used to connect the servers together? Are Desktop computers ok for this? We have found that we are mostly RAM-bottle necked, I understand that some servers have highly superior CPUs, but I'm not sure we need CPU power as much as we need RAM, which is cheap in Desktop computers. Will we have problems with the WIFI cards in the desktops or any other unexpected hardware limitation? What tools should be used to "image" the servers. For example, when we get an installation right for a Redis server or Cassandra node, are there tools that come with Linux Centos 6.3 to image the server to a USB drive or something like that? Or do we need to use some other software for this? What other things are we missing that we should be concerned about? Thanks so much!

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  • Awstats messaging non existant user causing exim4 to go nuts

    - by Chris
    I've taken over managing a server set up by someone else now uncontactable, while managing to work out most faults / changes needed this one is stumping me. Awstats is running on the machine and sending messages via exim4 to a user every time it runs an update. The user account has been deleted and so the exim4 main log files are filling up with message delivery errors, which firstly hinders meaningful log analysis for anything else and secondly uses up quite a lot of space (it grew to 22GB unattended, panic!) I've been through all the conf files in /etc/awstats and can't seem to find any mention of this user account. Google just turns up results about how to use awstats to parse exim4 log files. So the questions is where is this setting (on debian) likely to be? Cheers in advance

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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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  • Picking a linux compatible motherboard

    - by Chris
    Last time I bought a new computer (I build them myself) I got a motherboard that had really poor linux support for a long time. Specifically the audio. I had to wait months before the kernel supported the on board audio chipset. That is exactly the situation I'm trying to avoid this time around. I have some specific questions about "server motherboards" actually. I looked at a few models of server motherboards by intel, and some random models on newegg. I wasn't able to see much of a difference from regular desktop motherboard other than most had two sockets, and support for much more ram. These boards seem more popular with Linux users. Why? AMD and Intel both have server CPUs as well. Some question, what's the difference? To make this question more concrete, I was looking at this this motherboard. The main questions about it that I can't answer are: Can I get a motherboard without on board raid and audio? I wanted to get a hardware raid controller and a PCI audio card. I thought a server motherboard would be cheaper and not have these "extras", since who wants an audio card on a server? Where can I found out about Linux support for the components on this board? "Intel ICH10R", "Realtek ALC889", "Marvell 88E8056" I'm buying this computer to work as a Linux desktop for a lot of compiling, coding and audio/video work, but I don't want to rule out the possibility of installing windows and playing some games at one point. (even if the last game I got has been sitting in its box unopened for almost a year). Is it a good idea to buy a "server motherboard" and play games on it, or are desktop boards better value for this? The ultimate solution for me would be a motherboard that had GPL divers for onboard LAN, a single CPU socket, lots of PCI express and PCI. USB 3.0, and no fancy hard disk controllers since I'll be getting a separate one.

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  • IIS Logs not getting created

    - by Chris
    Hi I have a site running on IIS 6. I have turned on logging on the website tab of IIS and specified a directory for it to write to. Set it to an hourly schedule. However no logs are ever created. Have reset iis. checked disk space and permissions on the directory it is writing to but no logs are ever created. I can see this did work once, as there are logs created in the system32/logfiles directory from about a year ago. Even if I specify that directory nothing new gets created This is on a hosted service What else can I check? Is there any place that errors would be written to that might give me a clue as to what is going on? Have tried event viewer but nothing untoward in there Would appreciate any pointers on this

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  • Definitive download location for MBSA "wsusscn2.cab" file for offline mode scans?

    - by Chris W. Rea
    I'm running Microsoft Baseline Security Analyzer 2.1 against some servers that don't have outbound access to the Internet, by design of firewall restrictions, and therefore I'm wishing to run MBSA in offline mode. In order to do so, I need the list of updates in the file named "wsusscn2.cab". Is there a well-known page or URL at Microsoft for downloading the most up-to-date version of that file for MBSA offline mode? Thank you.

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  • OS X random, jumpy dragging behavior

    - by Chris
    This problem has been going on since I got 10.7, and is persisting or even getting worse since I updated to Mavricks. The best way to describe it is thru an example- Let's say I'm working in Safari. Everything is working fine. Then, I'll switch to another app by clicking on it's window, for example, I'll click on Messages to shoot back a reply. When I click back to Safari, keyboard and mouse inputs don't work! The only way I can regain control of the app (Safari) is by clicking on the apps top bar, which then causes the app to jump left or right. If I'm in Messages and I switch back to Safari by clicking said top bar, it works fine. Same with switching back and forth using command-tab. I've narrowed the problem down to this - the first app (Safari, in this example) is, for some reason, deciding that I'm in the process of dragging the window around. This could be just an oddly persistent glitch in my system, but has anyone else seen this before? Perhaps a misplaced default write... somewhere along the line? Update A PRAM reset did absolutely nothing

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  • avconv and ffmpeg - drawtext filter text_w evaluates as 0 in Ubuntu Precise

    - by Chris White
    I'm attempting to draw text onto a video using either the avconv or ffmpeg commands. When specifying x= for where on the final video to place the text, the 'text_w' value is evaluating to 0, rather than the width of the rendered text as it should. I'm using Ubuntu 12.04 I've got avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1 and ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1 Example command: avconv -i test.mov -vf "drawtext=fontfile='/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf':text='test text':x=text_w:y=50:fontsize=24:fontcolor=black" texted.mov This command causes the text to be printed as if x were set to 0. What I'd really like to be able to do is center the text horizontally using something like this: avconv -i test.mov -vf "drawtext=fontfile='/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf':text='test text':x=(main_w-text_w)/2:y=50:fontsize=24:fontcolor=black" texted.mov Using ffmpeg for to attempt the same ends with the same result ffmpeg -i test.mov -vf "drawtext=fontfile='/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf':text='test text':x=(main_w-text_w)/2:y=50:fontsize=24:fontcolor=black" texted.mov

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  • Query Execution Failed in Reporting Services reports

    - by Chris Herring
    I have some reporting services reports that talk to Analysis Services and at times they fail with the following error: An error occurred during client rendering. An error has occurred during report processing. Query execution failed for dataset 'AccountManagerAccountManager'. The connection cannot be used while an XmlReader object is open. This occurs sometimes when I change selections in the filter. It also occurs when the machine has been under heavy load and then will consistently error until SSAS is restarted. The log file contains the following error: processing!ReportServer_0-18!738!04/06/2010-11:01:14:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'., ; Info: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'AccountManagerAccountManager'. ---> System.InvalidOperationException: The connection cannot be used while an XmlReader object is open. at Microsoft.AnalysisServices.AdomdClient.XmlaClient.CheckConnection() at Microsoft.AnalysisServices.AdomdClient.XmlaClient.ExecuteStatement(String statement, IDictionary connectionProperties, IDictionary commandProperties, IDataParameterCollection parameters, Boolean isMdx) at Microsoft.AnalysisServices.AdomdClient.AdomdConnection.XmlaClientProvider.Microsoft.AnalysisServices.AdomdClient.IExecuteProvider.ExecuteTabular(CommandBehavior behavior, ICommandContentProvider contentProvider, AdomdPropertyCollection commandProperties, IDataParameterCollection parameters) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.AnalysisServices.AdomdClient.AdomdCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.DataExtensions.AdoMdCommand.ExecuteReader(CommandBehavior behavior) at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery() Can anyone shed light on this issue?

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  • How to split an m4v file?

    - by Chris
    I downloaded a TV season on iTunes (.m4v files), however the files are clustered into 3 episodes each. I'd like to chop these up so that each episode is in it's own file. Googling around a while didn't provide any promising leads. What's the easiest way to split these files up? Thanks in advance, Cheers!

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  • Client/server application RPC connection gets disconnected very frequently

    - by Chris Thompson
    I have a client/server application that uses RPC for the client to communicate with the server. Fairly regularly, I get an event in the Application log that the RPC connection was disconnected: Client callback failed ((0x80010108) ) I have the Windows Firewall disabled on both machines. I've even run the client on a second computer with a clean Windows XP install without any group policies. This has been going on for a long time and no one has been able to figure out why it's happening. The same client/server app works fine at other client locations. Any thoughts?

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  • squid will not listen on specific IP

    - by Chris
    I have a public subnet with squid installed. Let's say my subnet is from 1.2.3.2 to 1.2.4.254. When I set the following: http_port 50000 http_port 1.2.3.2:50000 it is working. But when I set: http_port 1.2.4.37:50000 it is not working. It is only working with my first public IP from my subnet. The error I get when it is not working is the following: commBind: Cannot bind socket FD 10 to 1.2.4.37:50000: (99) Cannot assign requested address What is wrong with my configuration? @Zoredache I have a dedicated server and the whole subnet is defined as IP Range. When I use only the port or the first IP and doing netstat -ntlp | grep 46555 I get the following: tcp 0 0 0.0.0.0:50000 0.0.0.0:* LISTEN 25532/(squid ) When I use my specific IP, then the netstat query will show nothing, as the server does not start. I don't want squid to listen on all or the first IP, it is just a specific one it should listen to.

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  • How do I get netcat to accept connections from outside the LAN?

    - by Chris
    I'm using netcat as a backend to shovel data back and forth for a program I'm making. I tested my program on the local network, and once it worked I thought it would be a matter of simply forwarding a port from my router to have my program work over the internet. Alas! This seems not to be the case. If I start netcat listening on port 6666 with: nc -vv -l -p 6666, then go to 127.0.0.1:6666 in a browser, as expected I see a HTTP GET request come through netcat (and my browser sits waiting in vain). If I go to my.external.ip.address:6666, however, nothing comes through at all and the browser displays 'could not connect to my.external.ip.address:6666'. I know that the port is correctly forwarded, as www.canyouseeme.org says port 6666 is open (and when netcat is not listening, that its closed). If I run netcat with -g my.adslmodem's.local.address to set the gateway address, I get the same behavior. Am I using this command line option correctly? Any insight as to what I'm doing wrong?

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  • How to browse Windows XP from Mac Finder when name disappears from finder

    - by Chris
    Occasionally, like right at this moment, I cannot access my windows share from my mac. Normally, it works, but every now and then, the computer name won't be displayed under SHARED in Finder. Rebooting the windows computer usually fixes this, but it's inconvenient. The Windows computer can see the Mac on the network. Is there a method of asking finder to poll for windows shares again, or "forcing" finder to look for "desktop"? I'm looking for the equivalent of \desktop in the address bar of a Windows computer. Thanks for the help.

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  • Cisco asa 5505 locks up / unresponsive

    - by Chris
    We have a cisco asa 5505 that's new (in service for about 2 months) running 7.2(4) software. Every day around 10a it locks up for approx 10 minutes. We're monitoring it via snmp with stg, and snmp doesn't respond during that time. There's no output in the 'show crash' output. Internet connectivity is also dropped. Wondering if anyone else has seen this and what the fix might be. Currently we're looking at upgrading software, but will need memory upgrade for that. We've forced the speed and duplex on the internal and external interfaces, but the problem is still occurring. It's connected on the internal lan to a netgear 724 gige switch.

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  • Moving SharePoint 2010 to a new domain

    - by Chris
    I have a small SharePoint 2010 farm (1 WFE / App Server & 1 SQL server) Our organisation is currently mirgrating to our holding company's global domain, so we now have a new local DC on site with trusts between the current domain and the new domain. I am going to need to move our SP Farm to the new domain and possibly rename servers to fit into the global naming convention (we are trying to avoid this at the moment, but might become a requirement) If there a way to script (stsadm / powershell) the user profiles and permission accross to the new domain? and on the server side, is it as simple as joining the servers to the new domain and updating all the service / farm accounts to accounts on new domain? I have googled this a bit, but everything I have found so far refers to MOSS 2007 or earlier. Any help / advise would be appreciated.

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  • Bluetooth not seeing mouse (Fedora)

    - by Chris
    I have a Lenovo S10 'netbook' that I've installed Fedora 17 ("LXDE spin") on. So far pretty much everything works great, except, the on-board Bluetooth. lsusb shows the controller present (0a5c:2101 Broadcom Corp. Bluetooth Controller), hcitool dev shows hci0 present, but when I put my mouse ("Lenovo Bluetooth Laser Mouse," which works perfectly paired with a MacBook Pro, MacBook Air, Mac mini, and Lenovo SL500 (with a USB dongle; running Windows 7)) into pairing mode and run hcitool scan (reports "Scanning ..." and, without further information or error message, returns to the shell prompt), blueman-manager, or bluetooth-wizard (from the gnome-bluetooth package) and try to detect the mouse, I get nothing... Frustrating! Thanks anyone who can point me in the right direction!

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  • SPF record for Gmail?

    - by Chris
    I have DNS, with a SPF TXT record, configured for a domain name. The primary user of the domain name now needs to be able to send both from our SMTP servers, and also from her GMail account. I've seen all the information about adding "include:_spf.google.com" to the SPF TXT record, but, as I look into it, it appears that record is outdated. In particular, I had the user send me a test message, and note that it was: Received: from mail-la0-f50.google.com (mail-la0-f50.google.com [209.85.215.50]) However, _spf.google.com doesn't list that IP address: $ dig +short _spf.google.com txt "v=spf1 ip4:216.239.32.0/19 ip4:64.233.160.0/19 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:209.85.128.0/17 ip4:66.102.0.0/20 ip4:74.125.0.0/16 ip4:64.18.0.0/20 ip4:207.126.144.0/20 ip4:173.194.0.0/16 ?all" (Note that a 209.85.21*8*.0 network is listed, but not 209.85.21*5*.0.) Is there a better way to enable sending from GMail? This user sends to at least one recipient with a strict SPF policy that bounces mail not from a designated host... Many thanks!

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  • Applications don't see mapped network drive after waking from sleep

    - by Chris
    I have a network share mapped as a drive letter on a Windows 7 PC that's part of a simple home network. When I wake the PC from sleep, Explorer sometimes says the drive is disconnected. Doubleclicking the drive connects it instantly, as far as Explorer is concerned. But some other applications don't see the drive unless I take additional steps (e.g., navigate to the drive in an "Open..." dialog). Is there any way to get the drive to be connected for all purposes immediately when resuming from standby? I've found the "Always wait for the network at computer startup and logon" item in Group Policy, but I'm not sure what the setting does or whether it would fix this problem. I have network discovery enabled and un-firewalled.

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  • Windows 7 - cancel mirror synchronisation

    - by Chris W
    I've got basic disk OS managed disk mirroring setup in Windows 7 for a couple of volumes. After a power failure the mirrors are currently resynching. These are only small volumes of data but the sync has not completed after more than 24 hours. Is there any way to stop this as it's driving me nuts? I need to get the machine back to a usable state to get some work done but it's a bit of a dog whilst this synch is going on. I've tried removing the mirrors but it won't let me do that whilst the re-sync is in progress.

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