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• 1K incoming http post requests per second, each with a 10-50K file

  - by Blankman

  I'm trying to figure out what kind of server setup I will need to support: 1K http post requests per second each post will contain a xml file between 5-50K (average of 25 kilobytes) Even if I get a 100 Mb/s connection with my dedicated box (they usually give 10 Mb/s but you can upgrade), from my calculations that is about 12K kb/s which means about 480 25kb files per second. So this means I need around 3 servers then, each with 100 Mb/s connection. Would a single server running HAProxy be able to redirect the requests to other servers or does this mean I need to get something else that can handle more than 100 Mb/s to proxy things out to the other servers? If my math is off I'd appreciate any corrections you may have.

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• Solaris 10: Identify a PID and the CPU it's running on

  - by Marcus

  I have multiple instances of a database running on a Solaris system. I'd like to prove that each database process is being handled by a different CPU. Essentially, I want to be able to do something like a ps -ef | grep <process_name> to get the PIDs and then run another command (if required) to identify the CPU... Is prstat able to do this? I'm making an assumption that as each database instance is started each one uses a different CPU. I'm not sure if I'm understanding this correctly... The reason I want to do this is because Sun hardware has slow CPU's, but lots of them. Therefore, to get the best performance out of it, I need to try and spread the load among CPU's... Thanks

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• SQL Server Configuration Scripting Utility Release 9

  - by Bill Graziano

  There’s another update to my little utility to script a SQL Server’s configuration.  I use this for two purposes.  First, I use it to keep my database mirroring servers up to date.  Second, I capture the output in a version control system and keep that for historical reference. In release 3.0.9 I made the following changes: Rewrote the encrypted trigger scripting.  It will now list the encrypted triggers in a comment in the table script but can’t actually script them. It now scripts any server event notifications. You can script a single database using the /scriptdb flag.  Please note that it will also script the instance and system databases when it does this. It will script any user-defined endpoints.  This will capture your mirroring endpoints and more importantly any service broker endpoints. It will gracefully skip database mail on the Express Edition. It still doesn’t support SQL Server 2012.  I think that’s the next feature to add though.

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• What causes Remote Desktop Services Manager to crash in Server 2008 R2?

  - by milkmood

  I have this consistent problem of RDSM crashing in Server 2008 R2. It is either really slow to open, sometimes never opens, or after it's been open and working properly for a bit, stops working, and forces an unload of the snap-in. It's done this since the deployment of this server, new hardware, new instance of S2k8. Domain Administrator login. I am using it to manage 3 Terminal Servers, the other two are S2k3. I've used it without issues on other 2008 servers.

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• is there a linux equivalent of iTerm(mac) sending command to multiple tabs functionality?

  - by jabbertalker

  in iTerm, you can send a command to execute simultaneously on a set of already opened tabs. Is there a way to do this in linux (with gnome-terminal preferably)? for instance, supposed that I had 10 tabs already ssh'd into [email protected] and sudoed to root and wanted to send a command to run on all 10 tabs. The goal of this is to be able to stay within a set of tabs and command them, rather than having to use expect scripts to ssh and elevate and run commands. Basically, like how you could do in iTerm.

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• What is the best way to compare vhost traffic?

  - by Bob Flemming

  Recently one of my servers has been subjected to malicious ddos attacks. I have about 12 websites hosted on the server which uses name based v-hosting. I am trying to identify which virtual host(s) are getting bombarded with traffic. I have used tools such as iftop which is good for identifying hosts which are consuming lots of bandwidth, and also apachetop which is useful for identifying which resources are being requested on a single v-host. What I really need is a tool which allows me to see the amount of traffic being received by each v-host in real time so I can easily see which v-host is being targeted. Does such a tool exist?

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• Unable to sunchronize local and remote directories ("set times: Operation not permitted")

  - by Tom Auger

  I'm running into FTP errors using software like NetBeans or WinSCP: whenever I attempt to perform a synchronization or update of files from local -- server I get errors on the client saying "set times: Operation not permitted". This is clearly an issue with the way I've configured my Fedora installation. The user that I'm logging in with cannot touch -t any of these files, though he IS part of a group that has r/w access on the files. I do have root / sudo access to this server. What I would like to know is: a) is it likely that this problem would be solved by allowing my FTP user to "touch -t" these files b) how do I enable a certain user to be able to set timestamps on files without giving them ownership of the files (certain of these files need to be owned by Apache, for instance, so I don't want to chown them). Thanks in advance.

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• Fix X11 forwarding on OSX

  - by Such

  I am looking for a way to fix/debug a X11 forwarding session on OSX. Here is my situation: From my mac I connect to a Ubuntu workstation with ssh -X (tried ssh -Y as well). X11 forwarding works perfectly with firefox for instance, X11/Quartz is started automatically on OSX and firefox is displayed. X11 forwarding does not work with bat (Bacula graphical console): X11 is started but no window is displayed. There are no errors (/private/var/log/system.log). When I try doing the same from another Ubuntu workstation, it works perfectly for both firefox and bat. I guess the problem is on OSX side then. I tried switching some options in X11 but nothing works. Would you have any idea on how to move forward? Thanks!

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• Hooking up many different external HDs simultaneously

  - by cbizz

  I need a large amount of external storage for an upcoming project. I'm planning on purchasing 10 2TB external drives. I need them all hooked up to a single machine at the same time. What issues will I run into? I plan on using 2 power strips and having them all externally powered from the wall. I will use a USB hub to plug in all the drives. I need drive access time to be as fast as possible. I am using Ubuntu Linux(64 bit). Will I be able to mount 10 drives?

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• Can I use static routing to allow me to use my public IP from my LAN?

  - by jnm2

  I would like to be able to use the same hostname to connect to my computer from my phone whether I'm at home or away. Currently I have to maintain duplicate entries for remote desktop, for instance. My router doesn't seem to have a NAT loopback option. I have two routers in fact, a cable modem which goes straight to my main router which does wireless. I can add to the static routing tables on each. Can I use this to loopback the public IP or do I need different routers?

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• You cannot do cross joins in SQL Azure but there is a way around that....

  - by SeanBarlow

  So I was asked today how to do cross joins in SQL Azure using Linq. Well the simple answer is you cant do it. It is not supported but there are ways around that. The solution is actually very simple and easy to implement. So here is what I did and how I did it. I created two SQL Azure Databases. The first Database is called AccountDb and has a single table named Account, which has an ID, CompanyId and Name in it. The second database I called CompanyDb and it contains two tables. The first table I named Company and the second I named Address. The Company Table has an Id and Name column. The Address Table has an Id and CompanyId columns. Since we cannot do cross joins in Azure we have to have one of the models preloaded with data. I simply put the Accounts into a List of accounts and use that in my join.   var accounts = new AccountsModelContainer().Accounts.ToList(); var companies = new CompanyModelContainer().Companies; var query = from account in accounts             join company in                 (                       from c in companies                      select c                  ) on account.CompanyId equals company.Id             select new AccountView() {                                               AccountName = account.Name, CompanyName = company.Name,                                 Addresses = company.Addresses                         }; return query.ToList();   So as long as you have your data loaded from one of the contexts you can still execute your queries and get the data back that you want.

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• unable to format external drive to HFS+ for Mac

  - by dtlussier

  I have an external hard drive (1 TB Western Digital) that is currently formatted as FAT32 and I want to reformat it to a single partition of HFS+ for my Mac. I realize that I can read FAT32 from my Mac but want HFS as it has other feathers like permissions that I'd like to have. I have tried using Disk Utility to format the drive as I have done in the past, but when I go through the process it fails and throws out an error stating that it is unable to reformat the drive to HFS. What might be the reasons that this could happen? Are there any diagnostics I could run on the physical disk to check if it is running well?

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• Is it preferable to use POP or IMAP to check multiple google mail accounts from one?

  - by Adam Tuttle

  I have email accounts on several domains that use Google Mail, and thus far I've only ever used POP to send and receive mail from a single inbox. This is quite functional, and as long as I remember to select the appropriate FROM address when starting a new thread, mostly works without any additional thought: messages received on account A are replied to via account A, and so on. My only complaint is the lag -- I've seen sometimes as much as a half hour between messages arriving in an inbox before being imported into my primary inbox via POP. My question is this: Google also supports IMAP. Would that be in any way preferable over POP access? Reduced lag would be nice, but not at a general speed cost, if everything I do has to check another mailbox too.

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• Is there a way to get x-mouse-type scrolling under the cursor for child windows within one program window?

  - by eigor40

  I've been messing with X-mouse setups, to enable scrolling for whatever is under the cursor, regardless of whether it has the focus or not. I've found several ways to get this to work between various 'parent' windows (Win7's built-in mouse options, WizMouse, etc), but I've found nothing that will do the same thing with (for example) several child windows with spreadsheets, open at the same time in one parent Excel window. I have the spreadsheets set up so that two are visible in the window at the same time, but I always have to click on either one to scroll it up and down. I'd love to be able to scroll these just by moving the mouse and doing the scroll, without the extra focus-change-click. I am not a big fan of running separate parent windows for each spreadsheet, which I realize would be something of a workaround. I'd rather keep the single parent Excel window, but still have X-mouse functionality within it. Anyone know of any way to achieve this? I'd call it "XMouse for Child Windows".

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• Issue with corrupt 1tb volume: can we rescue SQL databases?

  - by Barrie Ashmore

  We have an instance where some how a 1tb volume has become corrupted. There are Event ID 55 errors in the system event viewer. When running chkdsk, it gets to 47% verifying indexes and returns to the command prompt. If we are unable to rescue the data on the drive then we have a full backup of the databases from some time ago. The logfiles of which are on a different volume which is intact. Would it be viable to restore the databases and somehow replay the log files? I have seen articles about replaying logfiles from a logfile backup (.trn), however we have the actual logfiles (.ldf) Any help would be appreciated.

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• Hard-drive will randomly fail to load GRUB. Booting a live USB/CD fixes the issue temporarily

  - by Usagi

  I am running 12.04 64-bit and am dual booting with Win7, for full disclosure, although I suspect that has nothing to do with my problem. Occasionally the boot-loader(GRUB) will fail to load and I will be presented with a black screen with a single blinking line. There is no apparent pattern although I suspect there is one and it is related to a program I am running. This has happened to me eight out of ten power cycles now and I can fix it consistently, however, I have no idea why it happens. My current fix is to boot a live CD (I've tried both KNOPPIX and Ubuntu with the same result) and that's it. Somehow booting with the live CD is enough to "wake-up" my hard drive. I then reboot and GRUB magically appears again. So what is going on? Is it possible that a program is corrupting my MBR and the live CD is restoring it? How can I narrow down the possibilities? Thanks. Additional: This is still a problem. I'm convinced now that it is not hardware related as I've spent the last month and several boot cycles on Windows without a hiccup. Recently when I started using Ubuntu again the problem started again. I am more interested in figuring out what is going on rather than actually fixing the problem. Are there any tools, logs, etc. I can use to unravel this mystery?

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• Set up router to vpn into proxy server

  - by NKimber

  I have a small network with a single LinkSys router connected to broadband in US via Comcast. I have a VPN proxy server account that I can use with a standard Windows connection, allowing me to have a geographic IP fingerprint in Europe, this is useful for a number of purposes. I want to setup a 2nd router that automatically connects via VPN to this proxy service, so any hardware that is connected to router 2 looks as though it is originating network requests in Europe, and any hardware connected to my main router has normal Comcast traffic (all requests are originating from USA). My 2nd router is a LinkSys WRT54G2, I'm having trouble getting this configured. Question, is what I'm trying to do even feasible? Should the WRT54G2 be able to do this with native functionality? Would flashing it with DD-WRT allow me to achieve my objectives?

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• Seek first to understand, then to be understood

  - by BuckWoody

  One of the most important (and most difficult) lessons for a technical professional to learn is to not jump to the solution. Perhaps you’ve done this, or had it happen to you. As the person you’re “listening” to is speaking, your mind is performing a B-Tree lookup on possible solutions, and when the final node of the B-Tree in your mind is reached, you blurt out the “only” solution there is to the problem, whether they are done or not. There are two issues here – both of them fatal if you don’t factor them in. First, your B-Tree may not be complete, or correct. That of course leads to an incorrect response, which blows your credibility. People will not trust you if this happens often. The second danger is that the person may modify their entire problem with a single word or phrase. I once had a client explain a detailed problem to me – and I just KNEW the answer. Then they said at the end “well, that’s what it used to do, anyway. Now it doesn’t do that anymore.” Which of course negated my entire solution – happily I had kept my mouth shut until they finished. So practice listening, rather than waiting for your turn to speak. Let the person finish, let them get the concept out, give them your full attention. They’ll appreciate the courtesy, you’ll look more intelligent, and you both may find the right answer to the problem. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• IEEE SRS documents: lightweight version when working with outside contractors?

  - by maple_shaft

  Typically we follow an Agile development process that tends not to put an emphasis on writing requirements and technical documents that nobody will read. We tend to focus our limited manpower to development and testing activities with collaborative design and whiteboarding as a key focus. There is a mostly standalone web component that will take quite a few weeks to develop, but this work can be mostly parallel with other project work going on. To try and catch up time I was given a budget for hiring a developer on oDesk to complete this work. While my team isn't accustomed to working off of a firm SRS document, I realize that with outsourced development that it is a good idea to be as firm and specific as possible so I realize that I need to provide a detailed Requirements and Technical Specification document for this work to be done correctly. When I do write a Requirements document I typically utilize the standard IEEE SRS document template but I think this is too verbose and probably overkill for what I need to communicate to a developer. Is there another requirements document that is more lightweight and also accepted by a major standards organization like the IEEE? Further, as what will be developed as a software module that will interact with other software modules, my requirements really need to delve into technical specifications for things to work correctly. In this scenario does it make sense to merge technical and requirements specifications into a single document, and if not, what is a viable alternative?

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• IIS7 application pool spawning worker processes

  - by scott_lotus

  IIS7 ASP.net 2.0 Number of worker processes growing out of control in single app pool. Appear to keep spawning upwards. Monitoring the w3wp.exe process i can see "current connections" to web service sometimes spawn out of control but not always , only worker processes are consistently growing when this issue occurs. Number of worker processes normally 0 - 20 , when spawning they can reach 1000 + This was deployed in: %windir%\Microsoft.NET\Framework64\v2.0.50727\aspnet.config maxConcurrentRequestsPerCPU="50000" maxConcurrentThreadsPerCPU="0" requestQueueLimit="50000" But issue still occurs. Have tried running PROCDUMP on the exe process but the mini dump isnt a great help. I understand this is 99% probable an app issue , what i need help with is tracking it down. Thank you for any tips. Scott

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• apache port number

  - by user983223

  For each development sites I want to have a unique port number. For instance, domain.com:1234 This is what I have in my httpd.conf file. After restart the page domain.com:1234 is not showing in the browser. Is there anything else that I need to do besides what I have already done to make this work? Listen *:1234 <VirtualHost *:1234> DocumentRoot /var/www/dev_sites/test ServerName domain.com:1234 </VirtualHost> It looks like if I go to my local hostname (kk.local:1234) it shows. Is there some sort of dns that I need to do? I really don't want to go into godaddy everytime I add a development site. Is there a way around that?

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• Simple Central Storage for HA mail server

  - by jtnire

  Hi Everyone, I will have 2 Postfix servers. One will be a backup of the other. What is the easiest method to provide central storage to both of these boxes? My infrastructure is very simple: Just a lot of Xen hosts, so there is no SAN or anything. Each Xen host does have RAID1 though. I don't mind mounting NFS shares on each of those mail servers, as long as the NFS server wasn't a single point of failure. Is there such a thing as redundant NFS? Any help would be appreciated Thanks

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• Does /boot safe on top of a lvm LV (logical volume)?

  - by fantoman

  Title already asked the question. More specifically, I read in some documents that logical volumes are nice in general but not for /boot in a linux system. They say that bootloaders don't understand LVM volumes, so create a separate partition for /boot out of lvm. I recently installed Ubuntu server (9.10) for my home server, but by default /boot is created in the LVM. Everything is fine now, but I am not sure it is safe to use /boot in LVM. Second question is do I really need a physical partition (volume)(pv) for /boot or is it equally fine if I put it into a logical volume (lv) on top of a single shared volume group. Thanks in advance.

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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