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• Stress test a server for simultaneous connection

  - by weston smith

  I am trying to figure out a practical way to stress test a server for 300 to 600 simultaneous connections. Any advice? Thank you everyone for the help. To be more specific (sorry I wasn't before) this is a Flash Media Server on AWS that will be streaming live video. I've been having problems with the video freezing/buffering for everyone and I need to verify if its on the user end, upload end, or server end. I mainly need help with stress testing the server with 300-600 multiple request before going live.

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• Squid - Selective reverse proxy and forward proxy

  - by Dean Smith

  I'd like to setup a squid instance to do selective reverse proxy for a configured list of URLs whilst acting as a normal forward proxy for everything else. We are building new infrastructure, parallel live as it where, and I want to have a proxy that people can use that will force selective traffic into the new platform whilst just acting as a forward proxy for anything else. This makes it very easy for people/systems to test the portions of the new platform we want without having to change too much, just use a proxy address. Is such a setup possible ?

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• My new favourite traceflag

  - by Dave Ballantyne

  As we are all aware, there are a number of traceflags.  Some documented, some semi-documented and some completely undocumented.  Here is one that is undocumented that Paul White(b|t) mentioned almost as an aside in one of his excellent blog posts. Much has been written about residual predicates and how a predicate can be pushed into a seek/scan operation.  This is a good thing to happen,  it does save a lot of processing from having to be done.  For the uninitiated though: If we have a simple SELECT statement such as : the process that SQL Server goes through to resolve this is : The index IX_Person_LastName_FirstName_MiddleName is navigated to find the first “Smith” For each “Smith” the middle name is checked for being a null. Two operations!, and the execution plan doesnt fully represent all the work that is being undertaken. As you can see there is only a single seek operation, the work undertaken to resolve the condition “MiddleName is not null” has been pushed into it.  This can be seen in the properties. “Seek predicate” is how the index has been navigated, and “Predicate” is the condition run over every row,  a scan inside a seek!. So the question is:  How many rows have been resolved by the seek and how many by the scan ?  How many rows did the filter remove ? Wouldn’t it be nice if this operation could be split ?  That exactly what traceflag 9130 does. Executing the query: That changes the plan rather dramatically, and should be changing how we think about the index seek itself.  The Filter operator has been added and, unsurprisingly, the condition in this is “MiddleName is not null” So it is now evident that the seek operation found 103 Smiths and 60 of those Smiths had a non-null MiddleName. This traceflag has no place on a production system,  dont even think about it

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• Evaluate cron expression

  - by Jake A. Smith

  Is there a command line tool that will simply evaluate a cron expression and return a bool response if it is supposed to be running right now? I'm looking for something I can use as a utility in another bash script. Something like so: run_script=$(/tools/evaluate-cron-expression "02 4 * * *") if [ "$run_script" -eq "1" ] # etc etc I know, I know, I could just setup a real cron job, but I'm playing with the idea of wrapping all of my scheduled scripts inside of another script.

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• How to reliably recieve message from AWS that my instance was rebooted / terminated / stopped?

  - by Andrew Smith

  I have Nagios, and I want it to stop monitoring instances when they are stopped from the console. The requirements are: The message passed from AWS is 100R% reliable, e.g. when Nagios is down, and the message cannot be delivered, it will be re-delivered promptly when Nagios is up The message will pass quickly There is no need to scan status of all instances via EC2 API all the time, but only once a while Many thanks!

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• Should I use "Raid 5 + spare" or "Raid 6"?

  - by Trevor Boyd Smith

  What is "Raid 5 + Spare" (excerpt from User Manual, Sect 4.17.2, P.54): RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is used as spare to rebuild the system as soon as a disk fails (Fig. 79). At least four disks are required. If one physical disk fails, the data remains available because it is read from the parity blocks. Data from a failed disk is rebuilt onto the hot spare disk. When a failed disk is replaced, the replacement becomes the new hot spare. No data is lost in the case of a single disk failure, but if a second disk fails before the system can rebuild data to the hot spare, all data in the array will be lost. What is "Raid 6" (excerpt from User Manual, Sect 4.17.2, P.54): RAID6: In RAID 6, data is striped across all disks (minimum of four) and a two parity blocks for each data block (p and q in Fig. 80) is written on the same stripe. If one physical disk fails, the data from the failed disk can be rebuilt onto a replacement disk. This Raid mode can support up to two disk failures with no data loss. RAID 6 provides for faster rebuilding of data from a failed disk. Both "Raid 5 + spare" and "Raid 6" are SO similar ... I can't tell the difference. When would "Raid 5 + Spare" be optimal? And when would "Raid 6" be optimal"? The manual dumbs down the different raid with 5 star ratings. "Raid 5 + Spare" only gets 4 stars but "Raid 6" gets 5 stars. If I were to blindly trust the manual I would conclude that "Raid 6" is always better. Is "Raid 6" always better?

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• Making Puppet manifests/modules available to a wide audience

  - by Kyle Smith

  Our team rolled puppet out to our systems over the last six months. We're managing all sorts of resources, and some of them have sensitive data (database passwords for automated backups, license keys for proprietary software, etc.). Other teams want to get involved in the development of (or at least be able to see) our modules and manifests. What have other people done to continue to have secure data moving through Puppet, while sharing the modules and manifests with a larger audience?

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• web based source control management software [closed]

  - by tom smith

  hi. not sure if this is the right place, but hopefully someone might have thoughts on a solution/vendor. Starting to spec out a project that will require multiple (50-100) developers to be able to manipulate source files/scripts for a large scale project. The idea is to be able to have each app go through a dev/review/test process, where the users can select (or be assigned) the role they're going to have for the given app. I'm looking for web-based, version control, issue tracking, user roles/access, workflow functionality, etc... Ideally, the process will also allow for the reviewed/valid app to then be exported to a separate system for testing on the test server/environment. This can be hosted on our servers, or we can do the colo process. I've checked out Alassian/Collabnet, but any thoughts you can provide would me appreciated as well. thanks

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• MySQL database Int overflow and can't login in.

  - by Ryan SMith

  I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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• Why can't I get out of display mirror mode?

  - by Roy Smith

  I've been running Ubuntu (10.04.1 LTS, 64-bit) for a while and just replaced my hardware with a faster machine with an ATI Radeon HD 5700 video card. I've got twin 1920 x 1080 displays. I downloaded the latest driver (ati-driver-installer-10-9-x86.x86_64.run) from the ATI web site and installed that. I've gone through a few rounds of playing with /etc/X11/xorg.conf, and can't get things right. At the moment, it's in display mirroring mode, and I can't figure out how to get it out of mirror mode. If I run Monitor Preferences, there's a "Same image in all monitors" checkbox. If I uncheck that, the little preview window switches to show two monitors. When I click Apply, it asks me to log out and log back in again. When I do that, I'm right back to mirrored mode. What's really weird is that I'm currently running a copy of xorg.conf from a coworker's machine. He's got identical hardware, and his display works fine. So, I'm inclined to think there's something else going on other than the conf file. Any ideas what might be wrong?

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• create vmware virtual machine via command line on linux system

  - by tom smith

  evaluating/investigating vmware, and how you create a "virtual machine" using the command line for rhel/centos. basically, i want to be able to create a test virtual machine and then be able to run the VM on another system using the virtual player. so, i'm looking for pointers/articles/instructions that detail what i need (in terms of tools/apps) and the steps needed to accomplish this. i've seen a few articles/sites that discuss creating virtual machines, but they all involve using the GUI. thanks update:: while vmware is the company. there are different tools/apps provided to create a Virtual Machine. Basically, I want to do a test, to ultimately have a Virtual Machine/Image that can be run on a separate server using the vmplayer app I've seen docs that discuss using the GUI to create the VM, but haven't found any (yet) that discuss how to accomplish this using the command line approach. thanks...

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• If i make a mail server can i send bulk email?

  - by Jake Smith

  I work for a small company and we have fallen into the fad of "email campains" a.k.a Junk mail. So far the company has gotten a subscriber list from our website, and paid a good chunk of change for a emailer program. The problem is, Our list has close to 4,000 people on it and growing. with gmail only allowing 100 emails per account through on SMTP and I am on a tight budget so I cant hire anyone else. I was thinking of doing a dedicated mail server off of the website server we have running in the office. Is it possible? to make emails on your own server, and then send it through your own SMTP? if it is, what software would I need and is if free or low cost at least. We run a WAMP server, i set it up just for information, but i could switch it to lamp or whatever if need be. Thank you for your time and youre answers

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• How to sort ps output by process start time ?

  - by Dean Smith

  Is there a way to sort ps output by process start time, so newest are either at the top or bottom ? On Linux ? On SysV5 ? On Mac ?

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• Why is my SSH session timing out in less than a minute?

  - by John Smith

  Within a minute of connecting to my remote Linux server through SSH, my session times out and I cannot contact the server until a few seconds have passed. Meanwhile, I'm connected to other servers without interruption. This is only happening when I establish connection from an hotel wireless AP. When I connect from my phone's Internet, the problem does not occur. Does anyone know what might be causing these unusual timeouts?

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• Puppet write hosts using api call

  - by Ben Smith

  I'm trying to write a puppet function that calls my hosting environment (rackspace cloud atm) to list servers, then update my hosts file. My get_hosts function is currently this: require 'rubygems' require 'cloudservers' module Puppet::Parser::Functions newfunction(:get_hosts, :type => :rvalue) do |args| unless args.length == 1 raise Puppet::ParseError, "Must provide the datacenter" end DC = args[0] USERNAME = DC == "us" ? "..." : "..." API_KEY = DC == "us" ? "..." : "..." AUTH_URL = DC == "us" ? CloudServers::AUTH_USA : CloudServers::AUTH_UK DOMAIN = "..." cs = CloudServers::Connection.new(:username => USERNAME, :api_key => API_KEY, :auth_url => AUTH_URL) cs.list_servers_detail.map {|server| server.map {|s| { s[:name] + "." + DC + DOMAIN => { :ip => s[:addresses][:private][0], :aliases => s[:name] }}} } end end And I have a hosts.pp that calls this and 'should' write it to /etc/hosts. class hosts::us { $hosts = get_hosts("us") hostentry { $hosts: } } define hostentry() { host{ $name: ip => $name[ip], host_aliases => $name[aliases] } } As you can imagine, this isn't currently working and I'm getting a 'Symbol as array index at /etc/puppet/manifests/hosts.pp:2' error. I imagine, once I've realised what I'm currently doing wrong there will be more errors to come. Is this a good idea? Can someone help me work out how to do this?

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• Diagnose remote desktop freezes in Windows 7 when no BSOD?

  - by Paul Smith

  Okay, I'm getting no joy from Asus or Microsoft on this, so hoping for some clues on how to narrow down the cause. I have very frequent OS freezes, always & only when running Remote Destkop Client (mstsc) in Windows 7 x64. I never have a bluescreen, and there is never a minidump. The display & input just freezes -- no keyboard, no mouse, and sound will just continue the last wavelength if any. So far, I can't find a way to trap the hang given that there's no bluescreen; advanced startup & recovery settings for system failure are "Write an event" checked, "Automatically restart" checked, and "Kernel memory dump". I've updated to the lasted BIOS, and tried a few different graphics drivers, both generic & ATI. I've also tried disabling Aero, and everything about the remote desktop experience (incrementally unchecked every box in the mstsc - options - experience tab), even disabled/unplugged external monitor to make sure it wasn't a dual-monitor issue. My specs are: Asus G73jh notebook 8GB RAM ATI Mobility Radeon HD 5800 Series graphics (recently tried driver versions 8.791.0.0, 8.801.0.0) American Megatrends G73jh.211 BIOS (7/27/2010) Windows 7 Home Premium x64 Windows Memory Diagnostic passed all of the following at least 3 times with no errors: MATS+ INVC LRAND Stride6 WMATS+ WINVC This notebook is better than most at removing heat (laudable vent design), so I'm not inclined to suspect thermal causes (especially since running 1080p video for hours has never caused a freeze, but mstsc does, reliably, within 5 minutes to an hour). This did seem to start happening after a Windows Update, but I've since reverted every patch applied since a week before the first occurrence, with no joy. (And I'd only had the PC for a couple weeks before that, so it could have been chance + less actual time spent remoting at the beginning.) I'm at my wits end, and I bought this laptop primarily as a remote terminal client (go figure, right?) Any ideas on how to identify the cause of this? Thanks!

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• MySQL database Int overflow and can’t login in.

  - by Ryan Smith

  I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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• Copying partial cell to another cell in OpenOffice Calc

  - by Justin

  Cell A1 says 0001 John Smith Cell A2 says 0002 Bill Snyder I want to basically split this, so one column just shows the numbers (0001, 0002, etc.) and then another column just shows the name. The first part is easy. Using the function "=LEFT(A1;4)" I can get 0001. How can I grab the name? Using "RIGHT(A1;99)", for example, will grab the entire string "0001 John Smith". Since each name is different in length, I'm not sure what to do. Can I somehow tell it to grab the whole string EXCEPT the first 4 characters? Or somehow tell it to grab the last 2 WORDS instead of a number of characters like it's asking?

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• Network monitoring library, or objects, for a cloud

  - by Andrew Smith

  I am looking for library to support server / switch monitoring, to actually be able to check with the device if it's working OK. However this requires some sort of auto-detection and device support. Basically I need to automatically detect a new device, start monitoring it like CPU and PING. So how do I auto-detect the machine remotely, this is something I need library for. Rackspace has something like this - "Cloud Monitoring API". But is there anything opensource which can be used same way? The Nagios and others doesnt have such API, and the big and expensive systems are too big to handle in public cloud, so there must be some other network monitoring engine with API, which can add a new servers automatically and support user isolation for example so I dont see other servers except mine.

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• What kind of hosting do I need? [closed]

  - by Robert Smith

  I have been trying to answer this question but I haven't found an specific answer to my situation. As I want to pay for what I need, I thought I could get a good answer here. I have custom made forum (rather than a built-in forum like the ones you can find as plugins, e.g. WP-Forum or phpBB type of software) in Django. I don't want to use Apache and modwsgi because it's usually very memory-hungry and I can't afford a big server. I prefer a combination of nginx and gunicorn which I think is very efficient (maybe you can also tell me what you think about that). I'm expecting to receive 10,000 to 20,000 visits each month with 15,000 to 30,000 page impressions. I have reviewed some cloud services like Amazon EC2 or Rackspace and other more traditional services (Linodo). This site won't use videos or big images and I certainly don't need a huge amount of bandwidth (200GB would be definitely too much). I need shell access so shared hosting is out of the question. What do I need to run a website like that without problems? What about RAM? 256MB would be enough (that's the amount of RAM offered by small instances in Amazon and Rackspace)? Do you know of any alternative to those I mentioned? If you need more information to provide a useful answer, please don't hesitate to ask. Thanks a lot.

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• Microsoft SQL Server Management Studio not working after installing .Net Framework 4

  - by smith watson

  Yesterday I installed .Net Framework 4 as it was required by Liquid XML Studio, but just after installing it, My SQL Server Management Studio stopped working. As soon as open the IDE I get package microsoft sql management studio package failed to load I tried pretty much all the solution posted on the internet but could not get it working, today when I removed the .Net Framework 4, SQL server management studio started working again. Then just to test, I installed the .Net Framework 4 back ... and I started getting the same problem in management studio. I want both on my machine ! how can i do it ? PS : OS is Windows 7

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• Windows 8 safe mode grub 2

  - by Adam Smith

  I need to boot into safe mode in Windows 8 Ultimate to un-install Avira as this is not supported in windows 8. The problem is I have also installed Ubuntu 12.04 and from the grub 2, I do not get the option to boot into windows 8 safe mode. I do not have the CD/DVD of windows 8. Also, "pressing f8 as soon as you press enter after selecting win8 kernel " or for that matter any other key (Shift+F8, F2, F12 ) did not help. Is there a way to get an option in the boot menu to boot into Windows 8 safe mode? Found some similar posts, but could not find any relevant answers. Thanks

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• Different configurations for ssh client depending on ip address or hostname

  - by John Smith Optional

  I have this in my ~/.ssh/config directory: Host 12.34.56.78 IdentityFile ~/.ssh/my_identity_file When I ssh to 12.34.56.78, everything works fine. I'm asked for the passphrase for "my_identity_file" and I can connect to the server. However, sometimes I'd also like to ssh to another server. But whatever the server, if I do: ssh [email protected] I'm also asked for the passphrase for "my_identity_file" (even though the server has a different ip address). This is very annoying because I don't have the public key for this file set up on all my servers. I'd like to connect to this other server (an old shared hosting account) with a password, and now I cant. How do I manage to use the key authentication only with one server, and keep using password by default for servers that aren't listed in my ~/.ssh/config ? Thanks for your help.

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• What is a good listserv replacement?

  - by David Smith

  A board I'm on has about 700 - 1300 members being served from a listserv maintained by a company one of our board members is on. This restricts the ability of other board members to use the listserv unless they are employees of the company. They want to move to a system where anyone can administer the list. I'm thinking of switching to Constant Contact or Google Groups. We want something that allows list members to manage their own contact preferences and enables anyone authorized to send emails to the list.

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• MacVim commands not working in insert mode

  - by paul smith

  The following shortcuts I have defined in my settings: "Select next/prev tabs noremap <C-Tab> :tabnext<CR> noremap <C-S-Tab> :tabprev<CR> are for going to the previous and next tabs of open files. The only annoying thing about it is anytime I want to switch tabs, I have to first get out of insert mode. How can I force MacVim to register these shortcuts even if I'm in insert mode?

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