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• How to know if my nginx is in good health?

  - by Howard

  I am running a nginx on EC2 (m1.small) for SSL termination. I am using 2 workers on Ubuntu, with latest nginx (stable), the network throughput is around 2Mbps and system load average is around 2 to 3. I am wondering if this system is in good health for now, e.g. what is the queue length (I know nginx can handle a lot of concurrent request, but I mean before the request is being served, how many of them need to wait before being served) what is the average queue time for a given request to be served. I want to know because if my nginx is cpu bounded (e.g. due to SSL), I will need to upgrade to a faster instance. My current nginx status Active connections: 4076 server accepts handled requests 90664283 90664283 104117012 Reading: 525 Writing: 81 Waiting: 3470

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• How to decide the optimal number of ruby thin/mongrel instances for a server, number of cores?

  - by Amala

  We are trying to deploy mongrel instances on a machine. What is the optimal number of mongrel instances for a server? Since an instance can handle concurrent connections, I do not see any benefit in starting more than 1 per core. Any more than that and the threads will just fight for CPU. Our predecessors have assigned 10 instances for 4 cores, but I think it will just cause CPU contention. Any definitive answers / opinions? I have seen this question: How many mongrel instances? But it is really not specific enough.

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• How do I securely store and manage 180 passwords?

  - by Sammy

  I have about 180 passwords for different websites and web services. They are all stored in one single password protected Excel document. As the list gets longer I am more and more concerned about its security. Just how secure, or should I say insecure, is a password protected Excel document? What's the best practice for storing this many passwords in a secure and easy manageable way? I find the Excel method to be easy enough, but I am concerned about the security aspect.

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• IRC Services with failover support?

  - by insertjokehere

  I run a single server (call it 'server A') IRC 'network', and thank to the generosity of some friends, I have been given a second server ('server B') that I can run an IRCd on in order to provide redundancy in case server A crashes. This is fine, I can set up a round-robin DNS with the servers linked. The problem I have is what to do about services? Does anyone know of a way to get the services to 'fail over' in case of a server failure? Eg, Server A starts off running the services, but suddenly crashes. Server B detects this and starts its own copy of the services (ideally with the same configuration and data as the services on Server B) One solution that comes it mind is to write a bot that each server runs, that sit in a channel periodically checking if the bot from the other server is in the channel. If it is, then all is well. If not, then failover. I would prefer not to have to code this myself though We are currently using Unreal IRCd and Anope services on Linux

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• what to do when ctrl-c can't kill a process?

  - by Dustin Boswell

  Ctrl-c doesn't always work to kill the current process (for instance, if that process is busy in certain network operations). In that case, you just see "^C" by your cursor, and can't do much else. What's the easiest way to force that process to die now without losing my terminal? Summary of answers below: Usually, you can Ctrl-z to put the process to sleep, and then do "kill -9 process-pid", where you find the process's pid with 'ps' and other tools. On Bash (and possibly other shells) you can do "kill -9 %1" (or '%N' in general) which is easier. If Ctrl-z doesn't work, you'll have to open another terminal and kill from there.

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• Select Data From XML in MS SQL Server (T-SQL)

  - by Doug Lampe

  So you have used XML to give you some schema flexibility in your database, but now you need to get some data out.  What do you do?  The solution is relatively  simple:   DECLARE @iDoc INT /* Stores a pointer to the XML document */ DECLARE @XML VARCHAR(MAX) /* Stores the content of the XML */   set @XML = (SELECT top 1 Xml_Column_Name FROM My_Table where Primary_Key_Column = 'Some Value')   EXEC sp_xml_preparedocument @iDoc OUTPUT, @XML   SELECT * FROM OPENXML(@iDoc,'/some/valid/xpath',2)                      WITH (output_column1_name varchar(50)  'xml_node_name1',                                                     output_column2_name varchar(50)  'xml_node_name2')   EXEC sp_xml_removedocument @iDoc   In this example, the XML data would look something like this:   <some>   <valid>     <xpath>       <xml_node_name1>Value1</xml_node_name1>       <xml_node_name2>Value2</cml_node_name2>     </xpath>   </valid> </some>   The resulting query should give you this:   output_column1_name    output_column2_name ------------------------------------------ Value1                 Value2   Note that in this example we are only looking at a single record at a time.  You could use a cursor to iterate through multiple records and insert the XML data into a temporary table.

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• How do I share a PHP 5.4 server between OS X and VMWare?

  - by Ben

  I'm running PHP 5.4 on OS X which allows me to set up a virtual server for any directory, using this Terminal command: php -S localhost:8000 This will then set up http://localhost:8000 which works great, but what I would like to do is share this server with the instance of Windows that I have running through VMWare in order to test in Internet Explorer. I was wondering if this is possible and if it is, how do I go about setting it up? Currently trying to visit http://localhost:8000 gives me 'This page cannot be displayed'. I'd really appreciate any help that you can give me on this as I don't have much experience with virtual machines/networking. Thanks in advance.

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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• One hard drive missing after converting from ide to ahci

  - by user700859

  I have two 500GB SATA HDD in my desktop running XP. After converting from IDE to AHCI, the HDD I use to store data can no longer be accessed from XP. It shows only the first partition as 150GB, and data type is listed as RAW. However, if I boot into a live linux environment or if I pull that HDD out and connect it using USB, I can still get to all my files again. So I completely formatted the HDD into one single partition. But XP still does not recognize it. It still shows the disk as the 150GB partition and data type is still RAW. What's going on and how do I fix this? Thanks in advance.

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• Insert escaped characters in seq command separator

  - by dhekir

  How do I insert a string containing escaped characters (\n, \t, etc) as separator for the seq command? The standard format includes a newline character: $ seq 3 1 2 3 But if I try to add something plus a newline, the backslash is escaped and a literal "\n" is used instead: $ seq -s "$\n" 3 1\n2\n3 The same happens using simple quotes, no quotes, or other escaped characters: $ seq -s "\t" 3 1\t2\t3 $ seq -s \t 3 1t2t3 This is not the standard behavior for commands such as echo, so I'm a bit confused here... Edit: Ideally, I'd like a somewhat portable solution (that works in tsch as well as bash, for instance), and without resorting to Perl or other languages.

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• Best way to lay-out the website when sections of it are almost identical

  - by Linas

  so, I have a minisite for the mobile application that I did. The mobile application is a public transport (transit) schedule viewer for a particular city (let's call it Foo), and I'm trying to sell it via that minisite. I publish that minisite in www.myawesomeapplication.com/foo/. It has the usual "standard" subpages, like "About", "Compatible phones", "Contact", etc. Now, I have decided to create analogue mobile application for other cities, Bar and Baz. These mobile applications (products) would be almost identical to the one for the Foo city, thus the minisites for those would (should) look very similar too (except for some artwork and Foo = Bar replacement). The question is: what do you think would be the most logical way to lay-out the website in this situation, both from the business and search engine perspective? In other words, should I just duplicate the /foo/ website to /bar/ and /baz/, or would it be better to try to create a single website under root path (/)? I don't want search engine penalties for almost-duplicate information under /foo/, /bar/ and /baz/, and also I don't want a messy, non-localized website (I guess the user is more likely to buy something if he/she sees "This-and-that is the application for NYC, the city you live in", not "This-and-that is the application for city A, city B, ..., NYC, ..., and city Z.")

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• Automatically change aspect ratio of WMC videos

  - by NeverwaY

  is there a way to automatically change the aspect ratio flag of a video so that it displays in 16:9 in all video players WITHOUT reencode? Quality loss is not a concern. I just need a quick and efficient way to convert several video files to 16:9 as quickly as possible. For instance, older tv show series. I use a plasma tv for my media center, and do not want black bars burnt into my screen when people that dont understand how to use the zoom function in WMC7 watch tv all day. thanks.

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• New Quiz! Is Your Business Set Up For Commerce Anywhere?

  - by Marie-Christin Hansen-Oracle

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 We have a fun new quiz available that allows you to test whether your retail business truly delivers commerce anywhere! (How do we define commerce anywhere, you ask? Have a look!) The quiz assesses how your retail business is set up across the four pillars we believe are essential in providing your customers the shopping experience they require. It will allow you to understand how you need to align your systems in order to succeed at commerce anywhere. A few questions we ask: Do you individualize the shopping experience for each customer? Do you empower your business users with the right tools and insight, so they in turn can serve your customers better? Is your platform flexible and does it, for example, support both B2C and B2B business models from a single solution? Take the quiz now and find out! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

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• Setting up Multiple Routers (as Hardware Firewalls) behind a Home Router

  - by Synetech

  I’ve currently got one computer behind a router with built-in firewall functionality, connected to a home cable-modem that has a single Ethernet port and one IP. I’m going to have to set up another computer for the rest of the family to use which of course will need to be connected to the Internet, probably wirelessly since the modem is in my room and the new system would not be. What I would like to do is to get two more small routers with firewall capability and connect each computer to a router, which would in turn connect to the main router which connects to the cable-modem. That way, both systems have a hardware firewall protecting them (particularly the wireless system) and the burden of blocking would be reduced on both the computer CPUs and the main router because the secondary routers would handle some of the workload. I’m trying to find out about the complexities inherent in this design and how I could set it up to work, specifically the IP handling and NAT aspect. Thanks a lot.

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• RAID 1 not performing as expected

  - by Faken

  I recently bought a new 320Gb hard drive for my computer to set up RAID 1 on it for some added security. Installation went as smooth as could possibly be (plug in power, plug in data cable, start up computer, Intel software recognized new drive, right click create RAID 1, done!). However, for some inexplicable reason, I seem to have strange test results when using BENCH32. On my old configuration, a single 7200 rpm drive, I achieved about 60 MB/s write and 70 MB/s read. With a new RAID 1 configuration, I would expect the write to be slightly diminished but read to be significantly improved (though not exactly double speed). However, with the new configuration, I am getting 90 MB/s write and only about 80 MB/s read. I should NOT be getting improved write performance, especially NOT better than read! What's going on? My system setup is: q6600 2.4ghz CPU 4Gb DDR2 667mhz RAM on board Intel ICH9R "RAID chip" 2x Seagate 7200 RPM 320GB drives in RAID 1 Widows 7 home premium 64-bit

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• Is it bad to have a very full hard drive on a high traffic database server?

  - by MikeN

  Running an Ubuntu server with MySQL for a high traffic production database server. Nothing else is running on the machine except the MySQL instance. We store daily database backups on the DB server, is there any performance hit or reason why we should keep the hard disk relatively empty? If the disk is filled up to 86%+ with the database and all of the backups, does it hurt performance at all? So would the DB server running with 86-90%+ full capacity perform less well in any way than the server running with only a 10% full disk? The total disk size on the server is over 1 TB so even 10% of the disk should be enough for basic O/S swapping and such.

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• Moving FederatedEmail/SystemMailbox from One Store to Another - Exchange 2010

  - by ThaKidd

  Hello all. Just upgraded from Exchange 2003 to 2010. Somehow, I have two mailbox databases on my single Exchange 2010 server. One database contains all of the mailboxes I had moved from the 2003 exchange server; the other contains two SystemMailboxes and one FederatedEmail box. I am just starting to get a grasp on the commands used in the EMS. I was wondering if someone could point me in the right direction to move these three "system" mailboxes into my actual mailbox database so I can eliminate the second database. Just trying to sure up this one server before I role out my backup Exchange server. Thanks in advance! Your help and ideas are greatly appreciated as I try to make this setup as simple as possible.

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• Where can I download Microsoft VC80.CRT version 8.0.50608.0 ?

  - by Leonel

  Hi, I've just installed Microsoft Office Home and Student 2007 in Windows XP SP3 When trying to run MS word or any other office app (Excel, PowerPoint), I get the following message: this application has failed to start because the application configuration is incorrect This also happens with other applications, for instance, Acrobat Reader. A bit of Googling around this error message suggests that this might be due to a mismatch of library versions. In fact, most of the articles and forum messages I found mention a programmer writing an application in Visual C++ and sending it to someone else, who then runs into that error. This is hardly my case ! I looked into Office's files and the manifest file for Excel suggests that Office is trying to use Microsoft VC80.CRT version 8.0.50608.0. However, in my Windows System folder, I can only find the assemblies for 8.0.50727.762 My next step will be trying to find version 8.0.50608.0. How can I find and download it ?

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• unable to properly execute binaries from PHP

  - by Lowgain

  I was building an app on a SUSE box, and had a binary called create_group for instance, which had a suid bit and allowed my PHP app to call exec('create group grpname'); and create a new group (there are others for users, etc). The binary was a small c script that calls setuid(0) and then runs the user creation stuff. This worked perfectly on the SUSE box I recently moved my project to Ubuntu and everything works fine except these binaries. I can run them from the shell and they work okay, but when I get the PHP app to run them it just does nothing. Is there anything Ubuntu would be doing differently that I'm missing?

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• Can we save image slices in sub folders in Photoshop?

  - by bobo

  I am using Photoshop CS5, by default, Photoshop saves image slices in a folder named images. This is fine but there are lots of images, saving them all in a single folder becomes quite messy. What I would like to do in Photoshop is, it allows me to specify which sub-folder a slice should go under the default images folder. For example, a website template PSD file, I would like to save image slices that appear in the header under images\header\. Maybe for the images in the footer, they should go images\footer\. Of course, I can group them manually after the slices are extracted. If possible, I would like to define them in Photoshop, so that every time the image slices are extracted, they each go to the specified sub-folder automatically. Is this possible in Photoshop?

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• does any sync software find files that have moved paths within a folder?

  - by kpierce8

  Say I have a pictures folder which I reorganized on one computer. I'd like to use that directory as the base and compare it with another version on a backup drive. Will any sync/compare program find that a file in one folder has moved locations within a compare folder. For instance say I reorganized my pictures from trips into folders by year with the trips folders inside each year folder. If I use a regular compare utility I wind up with two copies of everything that's moved in different locations.

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• PASS Summit Preconference and Sessions

  - by Davide Mauri

  I’m very pleased to announce that I’ll be delivering a Pre-Conference at PASS Summit 2012. I’ll speak about Business Intelligence again (as I did in 2010) but this time I’ll focus only on Data Warehouse, since it’s big topic even alone. I’ll discuss not only what is a Data Warehouse, how it can be modeled and built, but also how it’s development can be approached using and Agile approach, bringing the experience I gathered in this field. Building the Agile Data Warehouse with SQL Server 2012 http://www.sqlpass.org/summit/2012/Sessions/SessionDetails.aspx?sid=2821 I’m sure you’ll like it, especially if you’re starting to create a BI Solution and you’re wondering what is a Data Warehouse, if it is still useful nowadays that everyone talks about Self-Service BI and In-Memory databases, and what’s the correct path to follow in order to have a successful project up and running. Beside this Preconference, I’ll also deliver a regular session, this time related to database administration, monitoring and tuning: DMVs: Power in Your Hands http://www.sqlpass.org/summit/2012/Sessions/SessionDetails.aspx?sid=3204 Here we’ll dive into the most useful DMVs, so that you’ll see how that can help in everyday management in order to discover, understand and optimze you SQL Server installation, from the server itself to the single query. See you there!!!!!

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• How to make a text search template?

  - by Flipper

  I am not really sure what to call this, but I am looking for a way to have a "template" for my code to go by when searching for text. I am working on a project where a summary for a piece of text is supplied to the user. I want to allow the user to select a piece of text on the page so that the next time they come across a similar page I can find the text. For instance, lets say somebody goes to foxnews.com and selects the article like in the image below. Then whenever they go to any other foxnews.com article I would be able to identify the text for the article and summarize it for them. But an issue I see with this is for a site like Stack Exchange where you have multiple comments to be selected (like below) which means that I would have to be able to recursively search for all separate pieces of text. Requirements Be able to keep pieces of text separate from each other. Possible Issues DIV's may not contain ids, classes, or names. A piece of text may span across multiple DIVs How to recognize where an old piece of text ends and a new begins. How to store this information for later searching?

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• Windows DFS Limitations

  - by Phil

  So far I have seen an article on performance and scalability mainly focusing on how long it takes to add new links. But is there any information about limitations regarding number of files, number of folders, total size, etc? Right now I have a single file server with millions of JPGs (approx 45 TB worth) that are shared on the network through several standard file shares. I plan to create a DFS namespace and replicate all these images to another server for high availability purposes. Will I encounter extra problems with DFS that I'm otherwise not experiencing with plain-jane file shares? Is there a more recommended way to replicate these millions of files and make them available on the network? EDIT: I would experiment on my own and write a blog post about it, but I don't have the hardware for the second server yet. I'd like to collect information before buying 45 TB of hard drive space...

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