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• How do I register a service with Bonjour?

  - by Roman

  I am trying to start to use Bonjour. Here I found a manual how to register a service with Bonjour. The following is written there: The network services architecture in Bonjour includes an easy-to-use mechanism for publishing, discovering, and using IP-based services. Well let's see how to register a service. In the very beginning it is written: To publish a service, an application or device must register the service with a Multicast DNS responder But how?!?! First of all I do not know what is the Multicast DNS responder. Second, it is not written how do I do it. Where and what should I type? Should I use command line? Should I use some programming languages? What exactly should I type... Is there an easy way to start to use Bonjour? Well, it was emphasized several times how easy it should be to use it. But I cannot start to use it for several day. So, can anybody, pleas, help me with that?

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• Removing resource limits on Solaris 10

  - by mikeydonkey

  How should one remove all potential artificial resource limitations for a process? I just saw a case where a server application consumed resources so that some limitation was hit. The other shells into the same server etc were all extremely slow (waiting for something to free up for them; ie. prstat starting 5 minutes). It wasn't CPU/memory related problem so I think it has got something to do with ulimits / projects. Already managed to set the maximum open files to 500 000 and it helped a little bit. However there is something else and I can not figure out what resource is maxed out. I can get some in-house administrator probably to check this but I would like to understand how I could make sure there shouldn't be any limitations! If you think I am going the wrong way (would be better to figure out what limitation should be specfically tuned etc) please feel free to point me to the correct way. I know technical stuff - it's just Solaris 10 that is giving me headache :/

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• Change Windows 7 Explorer's Details Pane limits

  - by Paul

  For some reason, MS decided to completely kill the status bar's functionality in Win7 (and maybe Vista, but I don't know for sure). I have tried all possible options such as Classic Shell and so on. Basically, the one thing I miss most is seeing at a glance the total size of my selected files. I know I can press Alt+Enter or whatever, but that's not the point. The point is that the so-called 'details' pane stops providing details if more than 15 files are selected! WTH? Cannot understand the reason behind such a stupid arbitrary limit, that doesn't seem to be user-configurable at all. Anyway, what I'm looking for is a way to change that limit, either via the registry or otherwise. If changing the limit isn't possible, would it be possible for some programming genius to create a very small optimized light-weight non resource-hungry (you get the idea!) program whose sole purpose will be to automatically click the "Show more details..." link in the details pane after every file selection? For bonus points, the program should wait for a second or two after file selection is complete to do this, so that selecting multiple files in quick succession doesn't hit the HDD repeatedly. Any takers for the challenge? :)

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• Remote mouse pointer not visible in VNC

  - by aef

  I used VNC desktops as a kind of collaboration server, as shared planning and pair programming environment for a long time. Now my latest iteration uses a KVM guest running Fedora 17 "Beefy Miracle", the Cinnamon desktop environment and an X11VNC server. The X11VNC server is automatically started with the desktop environment using the following command: x11vnc -localhost -many -shared -display :0 -bg My problem is that depending on the VNC client, the mouse pointer of the remote system which is shown through VNC is not synchronized to my client. I really need this, so I can see what my partner is doing on the desktop. When using Vinagre 3.2.1 on Ubuntu Oneiric Ocelot (11.10) or Vinagre 2.3.0.3 on Debian Squeeze (6.0) and I don't have my local mouse pointer inside the VNC view, I cannot see the mouse pointer of my remote system, nor its movement. When using TightVNC on Windows 7, I can recognize a mouse pointer trace for very short amounts of time after moving the mouse, but it is not clearly visible. Using UltraVNC on Windows 7 the mouse pointer is clearly visible all the time. With Gnome 2 I never had any problems with remote pointer synchronization, using exactly the same clients. I suspect this could have something to do with Cinnamon's dependency on 3D acceleration. On the other hand, it doesn't change anything to start Cinnamon's fallback environment Cinnamon 2D. Update: Same effect when I use Gnome 3.

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• How do I find my missing songs from last.fm?

  - by duality_

  My disk failed with all my music with it, lots of them. But luckily, I scrobbled every song to last.fm. I am looking for a way to scan my disk for my songs and check last.fm and tell me which songs are missing from my disk that are present on last.fm. So to recap: I would need to log into my last.fm account and compile a list of all the songs I have scrobbled and then scan my computer for missing songs. Is there a program or script that does this? I don't mind it being a shell script even. Edit: I know this is possible because I came close to this a little time ago. I created a PHP script (web page) that got all my songs through Last.fm API and then went through my files on disk and read their id3 tag. I got very close: the program showed missing songs, but there were many small issues (id3 reading was buggy, tags had different data, etc.) that required more programming time that I didn't have.

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• Sun Grid Engine (SGE) / limiting simultaneous array job sub-tasks

  - by wfaulk

  I am installing a Sun Grid Engine environment and I have a scheduler limit that I can't quite figure out how to implement. My users will create array jobs that have hundreds of sub-tasks. I would like to be able to limit those jobs to only running a set number of tasks at the same time, independent of other jobs. Like I might have one array job that I want to run 20 tasks at a time, and another I want to run 50 tasks at a time, and yet another that I'm fine running without limit. It seems like this ought to be doable, but I can't figure it out. There's a max_aj_instances configuration option, but that appears to apply globally to all array jobs. I can't see any way to use consumable resources, as I'd need a "complex attribute" that is per-job, and that feature doesn't seem to exist. It didn't look like resource quotas would work, but now I'm not so sure of that. It says "A resource quota set defines a maximum resource quota for a particular job request", but it's unclear if an array job's sub-tasks' resource requests will be aggregated for the purposes of the resource quota. I'm going to play with this, but hopefully someone already knows outright.

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• Access NFS share from cygwin?

  - by Jason Voegele

  We have a Windows 2003 Server on which we have installed Microsoft's Services for UNIX, and we have mounted a few NFS shares that contain shared resources that we need to access from this box. When I log in to this server with remote desktop, I am able to browse the contents of the NFS shares and everything works fine. However, one use case that we have is that we need to access this server using SSH, and still be able to access the NFS shares. We are running the Cygwin SSH daemon to provide SSH access to the server, but for some reason when we log in to the Windows 2003 server using SSH we can no longer access the NFS shares. To demonstrate, here is the output of the 'mount' command, first from a Cygwin shell when logged in with remote desktop: $ mount C:/cygwin/bin on /usr/bin type ntfs (binary,auto) C:/cygwin/lib on /usr/lib type ntfs (binary,auto) C:/cygwin on / type ntfs (binary,auto) C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto) O: on /cygdrive/o type nfs (binary,posix=0,user,noumount,auto) P: on /cygdrive/p type nfs (binary,posix=0,user,noumount,auto) Z: on /cygdrive/z type nfs (binary,posix=0,user,noumount,auto) And now, the same 'mount' command when logged in with SSH: $ mount C:/cygwin/bin on /usr/bin type ntfs (binary,auto) C:/cygwin/lib on /usr/lib type ntfs (binary,auto) C:/cygwin on / type ntfs (binary,auto) C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto) Notice the missing O: P: and Z: NFS shares in the latter. Can anyone tell me why I am unable to see these NFS shares when logged in with SSH? Thanks!

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• Hardware chose: ASUS Eee Pad Slider or ASUS Eee Pad Transformer for web development?

  - by JamesM

  I was just wondering out of the following Tablets which one seams better to get? I am a web-developer, Always using Unix/Linux/BSD, I want a tablet that has a keyboard. http://gdgt.com/asus/eee/pad/slider/ http://gdgt.com/asus/eee/pad/transformer/ http://www.tweaktown.com/news/18311/asus_eee_pad_slider_transformer_tablets_with_physical_keyboard/index.html I know both are similar, but not sure what one I should get. The Slider seems very nice but again the keyboard is fixed to the tablet unlike the Transformer. P.S: I'm going to use one of the above to showcase my programming work at school, as well as just being used as a cheaper notebook than the $300 Windows.7 locked down notebooks. By Locked down, I mean we pay $300 for them and after 3 years we can do what ever to them, they are Lenovo thinkpad mini-10 and What they have installed is all you get, they don't let us install what ever OS on them. And with the question on both of those links, I think that the transformer would be better but that is only taking in the fact of it being both a tablet and a notebook. What I really care about is power; which one is more powerful? It will be running kFreeBSD-Debian-Squeeze with Linux-Mint theme with several other packages. Though I'm not going to run Windows (which I feel is bloated), I still want power. To help keep my computer from slowing down with cache, I will have a cron.d/hourly script cleaning out the cache memory.

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• OpenVPN-based VPN server on same system it's "protecting": feasible?

  - by Johnny Utahh

  Scenario: hosted machine (typically a VPS) serving wiki, svn, git, forums, email lists (eg: GNU mailman), Bugzilla (etc) privately to < 20 people. People not on team not allowed access. Seeking VPN-restricted access to said server. Have good user experience with OpenVPN-based servers/clients, but have yet to server-admin such systems. Otherwise, experienced Linux sysadmin. Target system: Ubuntu, probably 12.04. Seeking to put an OpenVPN process on above server to "protect" all the above-mentioned services, enabling only OpenVPN-authorized clients/processes to access above services. (Can easily acquire additional IP address(es) as needed for this setup.) Option: if absolutely needed, can employ an additional, dedicated, "VPN server" VPS simply to be my VPN server "front end." But prefer to have all server processes (VPN server plus other server apps) all running on same machine, if possible. Will consider further if dedicated-VPN-machine setup enables 1. easier installation/administration, 2. better/easier end-user experience, and/or 3. makes system significantly more secure. Any of above feasible? The main intention: create a VPN from purely-hosted resources, and not spend all the effort to make a non-VPN, secure site--which typically means "SSL wrapping" + all the continual webserver-application-update management. Let the VPN server deal with access security, and spend list time pushing said security "down" in the other apps/Apache.

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• Membership in two domains

  - by imagodei

  Hello! I would your suggestions for an effective solution for a person, who needs to access resources in two Windows domains and wants to use one computer. It's about our CEO, who has accepted a second position in another company. Accessing files and folders isn't big problem. The greatest challenge I see is that he wants to conveniently access Exchange accounts in both companies; he would like to send and receive mail in single Outlook if possible (two profiles?) There is also a challenge with calendars: he would like to have one calendar for all activities from both Exchange accounts. Creating a POP3 account for accessing second Exchange server is a last resort, because obviously there is a problem with scheduling meetings and other calendar related tasks. Forwarding and receiving all mail/tasks on primary Exchange server is inconvenient because simple replying to original sender is disabled; and also when manually changing the recepient, he will receive mail from the wrong address. We were considering Virtualisation, that is setting up an instance of virtual machine inside existing installation and then joining this virtual computer to a second domain. Then installing another MS Outlook. This would of course mean two different Outlook accounts, two different calendars, but would at least enable our CEO to access all information from a single laptop. Does anyone have any other idea? I know setting up two domains on a single computer is a no-go (without much hacking at least), but effective workarounds are appreciate. The thing I am looking here is high usage/efficiency/productivity, but also as elegant solution from the administration point of view. Thank you very much (if you managed to read this through, this is a good sign ^_^ )

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• IIS7 ASP.NET application - 2 identical apps in 2 identical app pools, 1 is responsive and 1 is not

  - by Ben

  I have an ASP.NET (v4.0) web app that is installed in a virtual directory (as an application) and is hosted in it's own app pool. This is repeated for each instance of the app (i.e. per customer). The app pools are integrated (not classic) mode and LoadUserProfile is set to true. Otherwise, default settings. Each instance currently has it's own copy of the code/config, and it's own data folder (basic file read/writes). 1 instance of this app runs well (operation used for comparison takes ~4 seconds). Every other instance runs slowly (from 10-25 seconds for the same operation). If I move the slower instance to the "fastest" app pool that instance springs to life. If I move the faster instance into the slower app pool that instance slows to a crawl. The app pools were created in the same way initially - manually. I later used the powershell copy routine to ensure an exact copy of the faster app pool and still the same behaviour. Comparing the apppool.config files shows they are identical barring the virtual directory assignments. There are no shared resources that are being blocked, so far as I can tell, and I tested that by shutting down the performant app pool and restarting... slow is still slow, and then when I restart that app pool (so it's loaded last) it's still faster...

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• Trouble printing to local printer when connected to VPN with split-tunneling enabled

  - by Marve

  I'm a volunteer network admin for a multi-tenant non-profit office space. One of our new tenants uses a VPN to connect to remote resources using RRAS and Small Business Server 2008. They also have a local network printer for the workstations in our office. When connected to the VPN, they cannot print to the local printer. I informed their network admin that they need to enable split-tunneling to fix this. Their network admin enabled split-tunneling, but apparently printing still didn't work. He told me that I need to open port 1723 on our office firewall to allow it to work. I'm just a novice administrator and not familiar with RRAS, but this doesn't sound right to me and I haven't been able to find anything on the web to validate it. Additionally, my understanding of split-tunneling is that it is handled entirely by the VPN client and should work irrespective of firewall settings. Is my understanding of the situation incorrect? What steps should I take to resolve this problem?

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• How to bypass vpn talking to VMWare Guest?

  - by marc esher

  Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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• overriding default scheduler for blkio requests in cgroups

  - by Aamir Mushtaq

  I am trying to optimize a set of servers that have to reside on single machine. i.e. i can have multiple application server, a DB server and of course a samba server as well in same instance. Now I was looking into several optimizing options available to me. In my quest, i did my tuning of the network stack. coming to the CPU, MEMORY and the BLKIO tweaks, i am using CGROUPS. The problem i am facing is that for enhanced performance in the nature of the applications that i am running, the CFQ Scheduler that is implemented for the BLKIO subsystem is not optimal. I was looking more for a Deadline Scheduler because that will serve my purpose well. My question is whether it is possible for us to change the scheduler in the kernel compilation itself for the BLKIO to Deadline and it will reflect in my usage of [CGROUP hierarchies][3]? Since when running the service cgconf, a new fs is mounted and i dont want it to revert to CFQ scheduler. I also welcome any suggestions that will enable me to have more control over my resources.

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• I want my logs sent to my mail with logrotate

  - by lericson

  Not strictly a question about programming as such, more of a log handling question. Anyway. My company has multiple clients, and each of these clients have a set of logs that I'd rather much want to get sent to by e-mail to me. Now, another prerequisite is that they're hilighted by simple HTML. All that is very well, I've managed to make a hilighter for the given log types. So, what I do is I use logrotate's prerotate stuff to send the logs as an e-mail message. Example: /var/log/a.log /var/log/b.log { daily missingok copytruncate prerotate /usr/bin/python /home/foo/hilight_logs /var/log/{a,b}.log | /usr/sbin/sendmail -FLog\ mailer [email protected] [email protected] endscript } The problem with this approach is basically that logrotate sucks: it'll run the command for every log file specified in the specifier, and to my knowledge there's no way to know which of the log files is being handled. (Which wouldn't really help anyway.) Short of repeating the exact same logrotate up to 10 times on different machines, the only thing I can do is just to get bogged down with log spam every night. And I grew tired of it today, so I ask.

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• How to get rid of "Maxback Engine" for good?

  - by Jonik

  I used to have a Maxtor Shared Storage II network drive; it broke down long ago already. (Later I tried to recover some data from it, and partially succeeded, but haven't yet fully documented it on that question.) Anyway, I just noticed there are still some lingering bits remaining of the (thourougly crappy) software that came with the Maxtor device: a background process called "MaxBack Engine". I googled around a bit and found something related but not very useful: http://www.straitmac.com/jforum/posts/list/600.page http://discussions.apple.com/thread.jspa?threadID=725692 Under /Applications I found "Maxtor EasyManage.app" which I used to use for controlling the drive, and showed it some "rm -rf". Before deleting, I noted that the bundle did contain "MaxBack Engine.app" under Content/Resources. But still, after reboot, the "MaxBack Engine" process is back. I did notice though that it only appears when logging in with my usual user account; with another account it wasn't launched. So, dear Mac gurus, what could I do about this pest? I guess I could fall back to some Unix hackery and write a cronjob that kills any process with that name, but obviously it'd be nicer to be able to clean up from my computer everything left behind by Maxtor's piece of software.

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• IIS 7 and ASP.NET State Service Configuration

  - by Shawn

  We have 2 web servers load balanced and we wanted to get away from sticky sessions for obvious reasons. Our attempted approach is to use the ASP.NET State service on one of the boxes to store the session state for both. I realize that it's best to have a server dedicated to storing sessions but we don't have the resources for that. I've followed these instructions to no avail. The session still isn't being shared between the two servers. I'm not receiving any errors. I have the same machine key for both servers, and I've set the application ID to a unique value that matches between the two servers. Any suggestions on how I can troubleshoot this issue? Update: I turned on the session state service on my local machine and pointed both servers to the ip address on my local machine and it worked as expected. The session was shared between both servers. This leads me to believe that the problem might be that I'm not using a standalone server as my state service. Perhaps the problem is because I am using the ip address 127.0.0.1 on one server and then using a different ip address on the other server. Unfortunately when I try to use the network ip address as opposed to localhost the connection doesn't seem to work from the host server. Any insight on whether my suspicions are correct would be appreciated.

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• How to run Fujitsu P27T-7 LED monitor in its not native resolution and have perfect fonts rendering

  - by Ilia Rostovtsev

  My problem is completely opposite to anything I could find as I need to run my monitor in its NOT native resolution and have perfect font rendering. I recently got myself Ultra HD 2560x1440 27 inch monitor (Fujitsu P27T-7 LED) and I have an issue with this. I would call it personal but I'm afraid it's not as few people already agreed with me. I do programming and the text on UHD is way to small for comfortable usage. I changed the resolution to regular Full HD (1920x1080), it became just right but the text is looking slightly blur now, in comparison to both its natural UHD resolution and/or to my old 23 inch NEC. I am pretty frustrated and not sure what to do and how to make fonts look just as sleek as they should? I can't work in UHD resolution (my vision is 100% perfect), simply if calculated, picture size with Ultra HD (2560x1440) on 27 inch is around 30% smaller than Full HD (1920x1080) on 23 inch. In order to have same font size, if compared with Full HD 23 inch, 27 inch Ultra HD monitor must be around 32 inches in size. If I set my new monitor to regular Full HD 1920x1080, then the fonts' size are just perfect but the quality is not as it's blurry? Could anyone please help me out with an advise of how to solve this problem? Spec: nVidia 560 Ti with DVI-D port on Fedora 20. EDIT 1: Changing fonts doesn't really help as everything else doesn't look the way it should. EDIT 2: The monitor is buzzing on 2560x1440 so badly in case there are lots of lines on the screen, like file listing. If I type ls /usr/bin it makes such nasty irritating sound. When resolution goes to 1920x1080 it's a bit better. Any idea why?

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• KeePass lost password and/or corruption due to Dropbox/KeePassX

  - by GummiV

  I started using Keepass about a month ago to hold my passwords and online accounts info. Everything was stored in a single .kdb file, only protected with a password. I'm using Windows 7. Now Keepass can't open my .kdb file with the error "Invalid/wrong key". I'm fairly confident I have the right password. Altough I might have mixed up a few letters I've tried about two dozen different combinations to minimize that possibility - but can't rule it out though. My guess is however that the .kdb file got corrupted, either due to Dropbox syncing (only using it on one computer though) or because I edited the file using KeePassX on Ubuntu (dual boot on the same computer, accessing a mounted Win7 NTFS partition), or possibly a combination of both. I have tried restoring older versions(even the original one) from Dropbox and trying out all possible passwords without any luck. (which does seem to rule out KeePassX as the culprit, since oldest copies are before I edited the file from Ubuntu) I have tried opening the file with the "Repair KeePass Database file" which always gives the "0xA Invalid/corrupt file structure" (the same error for when a wrong password is typed). I was wondering if there was any way for me to salvage my hard-gathered data. I know generally that brute force cracking is not feasible, but since I can remember probably more than half of the usernames/passwords, any maybe the fact that one of them does come up fairly often (my go-to pass for trivial stuff), that might simplify the brute force process to a doable time frame. Maybe the brute-force thing might incorporate the fact that I know the password length and what characters it's made from. (If we assume corruption, not a password-blackout on my part) I could do some programming if there are any libraries or routines that I could use. Other people seem to have had a similar probem http://forums.dropbox.com/topic.php?id=6199 http://forums.dropbox.com/topic.php?id=9139 http://www.keepassx.org/forum/viewtopic.php?t=1967&f=1 So hopefully this question will become a suitible resource for people when searching the web. Feel free to tell me if you think this should rather be a community wiki.

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• Unable to connect to second name of Windows 2008 Server R2 machine from XP

  - by Tumba

  I used the command netdom computername /add:newname.domainname.com to add a second name to a server running Windows 2008 Server R2. After restarting the server, I had DNS "A" entries for both names. In addition, the second name was added to HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters\OptionalNames, which I believe should have taken care of any NetBIOS resolution. From my Windows 7 workstation, I can ping both names and running net view on both names reveals the same list of resources. From Windows XP, I can ping both names, but net view only works on the first name. Running net view on the second name returns: System error 52 has occurred. You were not connected because a duplicate name exists on the network. Go to System in Control Panel to change the computer name and try again. What do I need to do to make the second name usable from XP clients? Update: I was able to resolve the problem by adding the REG_DWORD key DisableStrictNameChecking = 1 to HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters, then restarting the Server service. However, I do not understand why this was necessary.

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• How can I stop IIS7 (integrated mode) from reporting a 404 before I get a chance to handle it?

  - by Gary McGill

  I have an ASP.NET MVC 2 application running on IIS7 in integrated mode. I'm trying to do my own 404 handling, but IIS7 seems to be intercepting the error and returning its own 404 message to the client before I get a chance to handle it. I'm not having much luck coming at the problem from a programming perspective over on Stack Overflow, so I wondered if maybe it's a configuration problem. Is there something I have to do to tell IIS to let me handle my own errors? (I'm trying to use Application_Error in my global.asax but it's not even getting there). There is a custom error page defined (at the machine level, I think) for 404 but when I tried removing that it didn't really help - it simply showed a bald one-liner message instead. My code still didn't get a look in. Is it perhaps something to do with the routing? Maybe the "mysite.com/nosuchpage" URL isn't being routed to me and that's why I don't get a chance to intercept it? Do I need to do something so that ALL requests get routed through my app?

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• Best way to build / implement a corporate developer Linux distro with multiple kernels?

  - by Garen

  At work we have Linux users who understandably prefer using Ubuntu. Problem is, we also have developer tools that only work with 'officially' supported Linux distributions that use much older 2.6.18 based kernels. (And even if they worked with newer ones, the vendors could always say they won't "support" the software unless it's on one of their 'officially' supported platforms.) We could of course just tell them to use CentOS or something else 2.6.18-based, and I'm sure their response would be something like: "you can take Ubuntu from our cold, dead hands." :) Which brings to me some questions--is there any good/easy/recommended way to run something like Ubuntu as a host VM and Centos 5.x as a guest OS (with which system--Xen,KVM,VMWare, ...?), and then roll that into our own custom internal distribution that could be easily installed? KVM looks like a good high-performance option just recently included in RHEL 5.4, but if hardware support for virtualization like Intel-VT or AMD-V is necessary, then I'd guess only those folks with fairly new PCs will be able to do it. Would be very interested to hear how anyone else has addressed this kind issue. EDIT: The target audience / users of this kind of system would be developers, each one needs to run locally licensed commercial software, so building out some separate beefy central machines isn't an option unfortunately due to license restrictions. Even if that weren't the case, a couple developers could quickly eat up the resources with parallel builds. :) Ideally, I was hoping there was some step-by-step guide out there to build your own pre-built distribution that had e.g. CentOS 5.x and Ubuntu Desktop as a guest.

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• Performance data collection for short-running, ephemeral servers

  - by ErikA

  We're building a medical image processing software stack, currently hosted on various AWS resources. As part of this application, we have a handful of long-running servers (database, load balancers, web application, etc.). Collecting performance data on those servers is quite simple - my go-to- recipe of Nagios (for monitoring/notifications) and Munin (for collection of performance data and displaying trends) will work just fine. However - as part of this application, we are constantly starting up and terminating compute instances on EC2. In typical usage, these compute instances start up, configure themselves, receive a job from a message queue, and then get to work processing that job, which takes anywhere from 15 minutes to over 8 hours. After job completion, these instances get terminated, never to be heard from again. What is a decent strategy for collecting performance data on these short-lived instances? I don't necessarily need monitoring on them - if they fail for whatever reason, our application will detect this and handle re-starting the job on another instance or raising the flag so an administrator can take a look at things. However, it still would be useful to collect information like CPU (user, idle, iowait, etc.), memory usage, network traffic, disk read/write data, etc. In our internal database, we track the instance ID of the machine that runs each job, and it would be quite helpful to be able to look up performance data for a specific instance ID for troubleshooting and profiling. Munin doesn't seem like a great candidate, as it requires maintaining a list of munin nodes in a text file - far from ideal for an environment with a high amount of churn, and for the short amount of time each node will be running, I'd rather keep the full-resolution data indefinitely than have RRD water down the data over time. In the end, my guess is that this will require a monitoring engine that: uses a database (MySQL, SQLite, etc.) for configuration and data storage exposes an API for adding/removing hosts and services Are there other things I should be thinking about when evaluating options? Perhaps I'm over-thinking this, though, and just ought to run sar at 1-minute intervals on these short-lived instances and collect the sar db files prior to termination.

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• How to handle files that don't need version control in mercurial

  - by richardh

  I am new to mercurial, and for the most part do LaTeX reports and statistical calculations in R using .csv and/or .sqlite files. Re LaTeX, all I really care is the .tex file. Re R, I don't need version control on the .csv or .sqlite files because they are static. When I do 'hg add' for a repo with a .csv and/or .sqlite file, I get a warning like: rev2.sqlite: up to 3070 MB of RAM may be required to manage this file (use 'hg revert rev2.sqlite' to cancel pending addition) So I revert and subsequently use adds like hg add -X *.sqlite. I guess I really have two questions: (1) Should I ignore these warnings? Because these large files are static, can I just add to the repo knowing that the diff files will always be empty and not worry about wasted resources? (2) If I should keep excluding these files from the repo, is there away that I can fix this option? I.E., add to my .hgrc file something that always appends an option like -I *.tex -I *.R to my 'hg add' commands? Thanks!

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• Poor write performance on Debian server running NFS with 22TB exported JFS filesystem

  - by user143546

  I am currently running a debian server that is exporting a large JFS filesystem (22TB) over NFS (nfs-kernel-server.) When attempting to write to the NFS share, the performance is very poor. The 22TB disk is sitting on a NAS mounted using iSCSI. It will bust for a moment near expected line speed, and then sit idle for several seconds. Very little traffic measured in the low kb/sec. The wait peeks on write. When reading from the NFS mount, the system operates at expected speeds (11MB/sec). The issue does not occur when using SFTP, rsync, or local coping (non-nfs). The issue persists between stable and testing releases. On the same machine I have a 14TB ext4 filesystem using the exact same export configuration that does not share the issue. This share is not in regular use and thus not consuming resources. NFS Server: cat /etc/exports /data2 10.1.20.86(rw,no_subtree_check,async,all_squash) cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /etc/default/nfs-kernel-server RPCNFSDCOUNT=8 RPCNFSDPRIORITY=0 RPCMOUNTDOPTS=--manage-gids NEED_SVCGSSD= RPCSVCGSSDOPTS= NFS Client: cat /etc/fstab 10.1.20.100:/data2 /root/incoming nfs rw,noatime,soft,intr,noacl 0 2 cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /proc/mounts 10.1.20.100:/data2/ /root/incoming nfs4 rw,noatime,vers=4,rsize=262144,wsize=262144,namlen=255,soft,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.1.20.86,minorversion=0,addr=10.1.20.100 0 0 This problem has me pretty stumped. Any help would be greatly welcomed. Thanks.

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