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• Architectural advice - websockets javascript/php integration

  - by Ewan Vaentine

  Myself and a friend have started making a game, he's likely to be using impact.js for the user interaction etc, but we need multiplayer functionality so some form of websockets for TCP connections etc. So we were thinking impact.js into socket.io and node.js. However, user accounts, ecommerce, session handling and social media integration will all be handled with Codeigniter (PHP), my question is, is it wise to have node.js running in parallel with Codeigniter, or if this is even possible? If not, if you were to create a multiplayer online game utilising ecomms to buy credits and user accounts, how would you go about this from a structural position and what engines/frameworks would you recommend? I'm new to this site so I apologise in advance if I'm posting something inappropriate. Cheers, Ewan

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• Make Sprite Jump Upon a Platform

  - by Geore Shg

  I have been struggling to make a game like Doodle Jump where the sprite jumps on a platform. So how do you make a sprite jump upon platforms in XNA? Th platforms are represented by a list of positions like Public platformList As List(Of Vector2) This is the collision detection under update() Dim mainSpriteRect As Rectangle = New Rectangle(CInt(mainSprite.Position.X), CInt(mainSprite.Position.Y), mainSprite.texture.Width, mainSprite.texture.Height) 'a node is simply a class with the texture and position' For Each _node As Node In _gameMap.nodeList Dim blockRect As Rectangle = New Rectangle(CInt(_node.Position.X), CInt(_node.Position.Y), _BlocksTexture.Width, _BlocksTexture.Height) If mainSpriteRect.Intersects(blockRect) Then 'what should I do here? For example velocity and position?' End If If (_node.Position.Y > 800) Then nodeList.Remove(_node) End If Next

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• Missed question in technical phone interview and the follow up letter

  - by Jacob

  I may have just bombed a C++ technical phone interview. The interviewer asked mostly about data structures and I was able to go into detail about each of the data structures he asked about. Score one for me I'm thinking. Wrong. Then he asks to join me on a collaboration website where he can see what I am typing. This was the same process as interview #1 which went well, not perfect, but well. So the question was: How do you reverse a linked list? he gave a function prototype similar to Node *reverse(Node *head) I struggled with this for about 10-15 minutes until the hour was up. I was able to get the general idea across but was not able to reverse the link list. My question is that after remembering the answer post interview do I mention this in the thank you letter, if I even should write one?

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• Is it possible to modify a video codec + distribute it?

  - by Nick

  this is my first question on this particular stackexchange node, not sure if it's the most appropriate place for this question (if not, guidance to the appropriate node would be appreciated). the abstract: I'm interested in modifying existing video codecs and distributing my modded codecs in such a way as to make them easily added to a users codec library... for example to be added to their mpeg streamclip, ffmpeg etc. some details: I've had some experience modifying codecs by hacking ffmpeg source files and compiling my hacked code (so that for ex: my version of ffmpeg has a very different h.263 than yours). I'm interested now in taking these modified codecs and somehow making them easily distributable, so others could "add them" to their "libraries." Also, I realize there are some tricky rights/patent issues here, this is in part my motivation. I'm interested in the patent quagmires, and welcome any thoughts on this as well. ctx link: if it helps (to gauge where I'm coming from) here's a link to a previous codec-hacking project of mine http://nickbriz.com/glitchcodectutorial/

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• Inheriting XML files and modifying values

  - by Veehmot

  This is a question about concept. I have an XML file, let's call it base: <base id="default"> <tags> <tag>tag_one</tag> <tag>tag_two</tag> <tag>tag_three</tag> </tags> <data> <data_a>blue</data_a> <data_b>3</data_b> </data> </base> What I want to do is to be able to extend this XML in another file, modifying individual properties. For example, I want to inherit that file and make a new one with a different data/data_a node: <base id="green" import="default"> <data> <data_a>green</data_a> </data> </base> So far it's pretty simple, it replaces the old data/data_a with the new one. I even can add a new node: <base id="ext" import="default"> <moredata> <data>extended version</data> </moredata> </base> And still it's pretty simple. The problem comes when I want to delete a node or deal with XML Lists (like the tags node). How should I reference a particular index on a list? I was thinking doing something like: <base id="diffList" import="default"> <tags> <tag index="1">this is not anymore tag_two</tag> </tags> </base> And for deleting a node / array index: <base id="deleting" import="default"> <tags> <tag index="2"/> </tags> <data/> </base> <!-- This will result in an XML containing these values: --> <base> <tag>tag_one</tag> <tag>tag_two</tag> </base> But I'm not happy with my solutions. I don't know anything about XSLT or other XML transformation tools, but I think someone must have done this before. The key goal I'm looking for is ease to write the XML by hand (both the base and the "extended"). I'm open to new solutions besides XML, if they are easy to write manually. Thanks for reading.

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• Change the output of the facebook like button [migrated]

  - by Mechaflash

  I've tied in the code for the facebook like button from the facebook dev site (I currently use the iframe version) directly into the html of a node (or content post). I want to be able to manipulate what text is sent when someone hits the like button. you can see the site and buttons here www.masteringmoneybasics.org I've tried both the iframe and html5 versions of the button and can't see where to alter what is sent. If there is no way to directly alter what is sent, does anyone know what it looks for in content to be sent so I can structure the node correctly? If you notice, when you like the page, it doesn't get the first sentence of the content, but all content after it, and I've tried putting different content in between the two lines (in its own <p>) and it still grabs the latter. Also how it figures out which image to grab from the page? Most times it doesn't take any image, however twice it's grabbed the middle school image.

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• Do I have to release the code of a MIT licensed software running a GPL library?

  - by Belohlavek

  Lets say I'm using Node-Webkit, an MIT licensed app runtime. Now, let's say I decide to include a Javascript library which is GPL licensed: while I do not modify the downloaded JS file, I do write my own code making use of the library's functions. I plan to sell the final obfuscated executable and I'm wondering: what's the final license of the complete software? Do I only have to release the GPL library or does the GPL license apply for all the code I wrote? What happens to Node-Webkit's MIT license?

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• UndoRedo on Nodes (Part 2)

  - by Geertjan

  After the recording of the latest API Design Tip for the upcoming NetBeans Podcast, Jaroslav Tulach helped me with the problem I blogged about yesterday. First he expressed surprise at seeing Undo/Redo work on Nodes, which was never the intention, i.e., that feature was always intended for documents, e.g., the Java editor. However, he then showed me where to find the Properties window in the NetBeans sources, where it is org.netbeans.core.windows.view.ui.NbSheet. It turns out that the Properties window does not have an activated node and hence the Node that implements UndoRedo.Manager is never put in the Lookup. Once we added, on line 303, "this.setActivatedNodes(nodes);", everything worked as expected, i.e., the Undo/Redo actions are now enabled, even when the Properties window is selected: Maybe it means I should file an issue to get that line added to NbSheet?

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• NeDB : la base de données légère écrite en JavaScript sort, simple et persistante, elle peut être utilisée « in-memory »

  NeDB : la base de données légère écrite en JavaScript sort Simple et persistante, elle peut être utilisée « in-memory »« Où pourrais-je trouver une base de données légère à utiliser dans mes projets Node.js ? » Cette question, un développeur du nom de Louis Chatriot se l'est posée. Ne trouvant rien de concret dans ses recherches qui répond à ses attentes, ce dernier a développé sa propre solution en JavaScript, qu'il a par la suite nommée NeDB.Le but de Chatriot n'est pas de rivaliser avec les caïds en place comme MongoDB ou Couch. En effet, NeDB dérive de MongoDB. Chatriot le compare à une sorte de SQL lite taillé pour les projets Node.js.NeDB prend en charge l'indexation. Le développeur...

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• Cocos2d push scene with parameter, the parameter is reset after push. How to troubleshoot? Thoughts?

  - by user72693

  In the helloWorldLayer.m, I push a scene with some parameter like this [[CCDirector sharedDirector] replaceScene:[CCTransitionFade transitionWithDuration:0.2 scene:[RootLayer sceneWithInt:123]]]; where the RootLayer I have a modified method +(CCScene *) sceneWithInt:(int) i{ CCScene *scene = [CCScene node]; GameplayLayer *layer = [[GameplayLayer node] retain]; [layer setTestInt:i]; [scene addChild: layer z:0 tag:100]; return scene; } In the above, the "GameplayLayer" has an Int property "TestInt" which I would like to set it before this layer is push. However, the moment the GameplayLayer is loaded, that TestInt property is reset to 0. It is not passing correctly. I remember in my last project this can be done. How to troubleshoot this?

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• ????Oracle EBS R12 on Exadata V2 ,MMA and Hight Performance

  - by longchun.zhu

  ???????? ?????,???, ????????hands-on ??? ??????: 1. Oracle EBS R12 on Database Machine MAA & Performance Architecture. 2. Oracle EBS R12 Single Instance Node Deployment Procedure. 2.Start Rapid Install Wizard. 3. Oracle EBS R12 Single Instance Node Chinese Patch Update. 4.Applying Patches. 5.Upgrade Application Database Version to 11g Release 2. 6.Database Upgrade 7. Deploy Clone Application Database to Sun Oracle Database Machine. 8.Migrate Application Database File System to Exadata ASM Storage. 9.Covert Application Database Single Instance to RAC.. 10.Configure High Availability & High Performance Architecture with Exadata.

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• ??1???????????????!???????????????|Oracle Coherence|??????

  - by ???02

  ????????????3????????????????????????????3??????????????????????????(?????????1?????????????????)????????????????????????RDBMS1?????????RDBMS??????????????????????????RDBMS????????????????RDBMS????????????????????????????????????SQL ????????????????????????????????????????RDBMS?????????????????????????????·???????????·??????????????????·???????????????????????????????(?????)????????????????????????????????????????????????????????????????????????????2??????????????????????????????????·??????????2?????????????????????????????·??????????????????????????????????????(?????????)???????????????????????????(????????)???????????????????·????????????????JBoss Cache??????????1????Java Map API????put/get?????????????????Java ?????????????????·??????????????????????????????????????????????1:JBoss Cache 3.0???????????????????????(Java Map API???????Java???????????????????????????)// ??????????Person????????????????// CacheFactory?DefaultCacheFactory?Cache?Fqn?Node?JBoss Cache????CacheFactory factory = new DefaultCacheFactory();// ????????Cache cache = factory.createCache();Fqn personData = Fqn.fromString("/person");// ???????????(?????·???)???Person???Node personNode = cache.getRoot().addChild(personData);// ??Person?????????????Person p1 = new Person(1234, "??", "??", "?????");// ?????·???????????personNode.put(1234, p1);?????·???·?????????·????????????????????????????????????·???·??????????????????????????·??????????????????2?????????????????????????????????????????????????????????????????????????????????????????????????????1????????RDBMS??????????????????????????2??????????????????Java API???????????????????????????????????????????????????????????·???·????????????????????????????·?????????·????????????????????????????????????????????·???·?????????????????????MapReduce???????????????????????????????????????????(?????)????????????????????·???·????????????????????????????????????????????????????????????·???????????????????????????????????????IT??????????????Web 2.0??????????????????????????????????????????????????????????????????????????????????????????????????????????????????2:??????????·???·???????Oracle Coherence?????????????????????(??????·?????JBoss Cache?????)// ??????????Person????????????????// CacheFactory?Oracle Coherence????// Person????????Map personCache = CacheFactory.getCache("person");// ??Person?????????????Person p1 = new Person(1234, "??", "??", "?????");// ?????·??????????personCache.put(1234, p1);??????????????????????3 ???????????????????????????????????·???????????????????????????·???·??????????????????????????????????·???????????????????12

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• VirtualBox Issue: virtualbox changed my Computer Name's ip address in Windows

  - by suud

  I had installed virtualbox 4.2.2 in Windows 7. My Computer Name is: MY-PC My IP address (using ipconfig /all command) is: 192.168.1.101 My IP is dynamic and I set DNS to google dns (8.8.8.8) When I ping MY-PC, I got this result: Pinging MY-PC [192.168.56.1] with 32 bytes of data: Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 Reply from 192.168.56.1: bytes=32 time<1ms TTL=128 My virtualbox was not running and I expected the ip adress of MY-PC is 192.168.1.101, not 192.168.56.1 Then I run command: nbtstat -a MY-PC and I got this result: VirtualBox Host-Only Network: Node IpAddress: [192.168.56.1] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- MY-PC <00> UNIQUE Registered WORKGROUP <00> GROUP Registered MY-PC <20> UNIQUE Registered MAC Address = 08-00-27-00-60-B3 Local Area Connection: Node IpAddress: [0.0.0.0] Scope Id: [] Host not found. Wireless Network Connection: Node IpAddress: [192.168.1.101] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- MY-PC <00> UNIQUE Registered WORKGROUP <00> GROUP Registered MY-PC <20> UNIQUE Registered MAC Address = 94-0C-6D-E5-6D-5D So it seems virtualbox caused this problem. I want to know how to change back my Computer Name's ip address to 192.168.1.101 (or any ip address that set by my internet connection)?

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• How to find cause of main file system going to read only mode

  - by user606521

  Ubuntu 12.04 File system goes to readonly mode frequently. First of all I have read this question file system is going into read only mode frequently already. But I have to know if it's not caused by something else than dying hard drive. This is server provided by my client and I am just runing there some node.js workers + one node.js server and I am using mongodb. From time to time (every 20-50h) system suddenly makes filesystem read only, mongodb process fails (due read-only fs) and my node workers/server (which are started by forever) are just killed. Here is the log from dmesg - I can see there some errors and messages that FS is going to read-only, and there is also some JOURNAL error but I would like to find cause of those errors.. http://speedy.sh/Ux2VV/dmesg.log.txt edit smartctl -t long /dev/sda smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.5.0-23-generic] (local build) Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net SMART support is: Unavailable - device lacks SMART capability. A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options. What I am doing wrong? Same is for sda2. Morover now when I type any command that not exists in shell I get this: Sorry, command-not-found has crashed! Please file a bug report at: https://bugs.launchpad.net/command-not-found/+filebug Please include the following information with the report:

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• route propogation using OSPF in a network

  - by liv2hak

  I am using Juniper J-series routers to emulate a small telco and VPN customer.The internal routing will be configured with OSPF,MPLS including a default and backup path,RSVP for distributing labels withing the telco,OSPF for distributing routes from the customer edge (CE) routers to the VRF's in the adjacent PE's and finally iBGP for distributing customer routes between VRF's in different PEs. The topology of the network is shown below. The Addressing scheme for the network is as follows. UOW-TAU ******* ge-0/0/0 192.168.3.1 TAU-PE1 ******* ge-0/0/0 10.0.1.0 ge-0/0/1 10.0.2.0 ge-0/0/2 192.168.3.2 TAU-P1 ****** ge-0/0/0 172.16.1.0 ge-0/0/1 172.16.3.1 ge-0/0/2 10.0.2.2 HAM-P1 ****** ge-0/0/0 172.16.3.2 ge-0/0/1 172.16.2.1 ge-0/0/3 10.0.3.2 ACK-P1 ****** ge-0/0/0 172.16.1.2 ge-0/0/2 172.16.2.2 ge-0/0/3 10.0.1.2 HAM-PE1 ******* ge-0/0/0 10.0.3.1 ge-0/0/2 192.168.4.2 UOW-HAM ******* ge-0/0/0 192.168.4.1 I also set up loopback address for each node. I want to setup OSPF so that path to each internal subnet and router loopback address is propogated to all PE and P nodes.I also want to select a single area for PE and P nodes,and on each node I should add each interface that should be propogated. How do I accomplish this.? With my understanding below is the procedure to achieve this.Is the below explanation correct? I set up OSPF on UOW-TAU ge-0/0/0 interface and ge-0/0/1 interface and UOW-HAM ge-0/0/0 interface and ge-0/0/1 interface. let me call this Area 100. Once I have done this I should be able to reach each node from others using ping and traceroute. Any help is highly appreciated.

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• sql server 2008 cluster hang when a heavy load is run

  - by Billy OT

  we have a sql server 2008 active/active cluster running on wondows 2008R2 O/S. 14GB RAM, 4xCPU. we have set a ceiling of 12GB for sql server. We're running an agent job which loads 3 million records to a database. during this load the job fails and the cluster seems to attempt to fail over to the other node but unsuccessfully i.e., the cluster address is no longer accessible. we have to manually fail the cluster node back. during the load on viewing task manager we can see that memory usage hits a max of 12.5GB and CPU at times hits 100% on all 4 CPU, but for the most part fluctuates at an average of about 60%. I suppose my question is, will a cluster try to fail over if memory or CPU are taking a heavy hit? or am i barking up the wrong tree? also any ideas why it wouldn't fully fail over? we've crawled through logs, of which there are a lot, and can't find anything useful. we've also tried recreating the issue but it ran successfully at a later time. Also 3 million rows doesn't seem like a lot but in terms of resources should 14GB RAM and 4xCPU not be sufficient? Further information on this, we ran the load again today and corrupted the database! We received the error message : LogWriter: Operating system error 170. It looks like, under the heavy load, the sql cluster attempted to fail over and in doing so migrated a lun (or drive) which meant the disk was no longer reachable. (this is just our theory). The database is now 'suspect' and requiring restoration. The 170 error above also indicates that on failing over to the other node, the sql service could not start as it was already in use, therefore it couldn't fail over fully?? But I'm wondering why would it need to fail over in the first place? My assumptions could be completely wrong on this, so any ideas would be appreciated.

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• Ubuntu 12.04 glusterfs volume failed to mount at boot time

  - by user183394

  I have just setup 7 KVM guests, all running Ubuntu 12.04 LTS 64bit Minimal server to test out glusterfs 3.2.5 from the Ubuntu official repo. Two of them form a mirrored pair (i.e. replica 2), and five of them are clients. I am still new to this file system and would like to gain some "hands-on" experience. The setup was mostly uneventful, until I put in the following into each glusterfs client's /etc/fstab: 192.168.122.120:/testvol /var/local/testvol glusterfs defaults,_netdev 0 0, where 192.168.122.120 is the IP address of the first "glusterfs server". If I issue either a manaul mountall or a mount.glusterfs 192.168.122.120:/testvol /var/local/testvol on CLI, a mount shows that the volume is successfully imported. But once a client is rebooted, after it comes back up, the volume is not mounted! I searched the Internet, and found this article, but since I am not running both client and server on the same node, IMHO it's not strictly applicable. So, as a kludgy "get-around", I put in a sleep 3 && mount.glusterfs 192.168.122.120:/testvol /var/local/testvol into each client node's /etc/rc.local. It seems to be able to get the volume mounted on each node, as far as I can tell. But this is quite ugly, and I would appreciate a hint as to how to resolve this glusterfs-non-boot-time-mounting issue correctly. Note that I used the IP address of the first "glusterfs server" although the /etc/hosts of all nodes have been populated with their hostnames. I figured that the use of IP address is more robust. --Zack

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• Object Not found - Apache Rewrite issue

  - by Chris J. Lee

  I'm pretty new to setting up apache locally with xampp. I'm trying to develop locally with xampp (Ubuntu 11.04) linux 1.7.4 for a Drupal Site. I've actually git pulled an exact copy of this drupal site from another testing server hosted at MediaTemple. Issue I'll visit my local development environment virtualhost (http://bbk.loc) and the front page renders correctly with no errors from drupal or apache. The issue is the subsequent pages don't return an "Object not found" Error from apache. What is more bizarre is when I add various query strings and the pages are found (like http://bbk.loc?p=user). VHost file NameVirtualHost bbk.loc:* <Directory "/home/chris/workspace/bbk/html"> Options Indexes Includes execCGI AllowOverride None Order Allow,Deny Allow From All </Directory> <VirtualHost bbk.loc> DocumentRoot /home/chris/workspace/bbk/html ServerName bbk.loc ErrorLog logs/bbk.error </VirtualHost> BBK.error Error Log File: [Mon Jun 27 10:08:58 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/node, referer: http://bbk.loc/ [Mon Jun 27 10:21:48 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/sites/all/themes/bbk/logo.png, referer: http://bbk.$ [Mon Jun 27 10:21:51 2011] [error] [client 127.0.0.1] File does not exist: /home/chris/workspace/bbk/html/node, referer: http://bbk.loc/ Actions I've taken: Move Rewrite module loading to load before cache module http://drupal.org/node/43545 Verify modrewrite works with .htaccess file Any ideas why mod_rewrite might not be working?

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• Mysql cluster strange behaviour

  - by Champion

  Hi Guys, I have 2 mysql clusters on two different servers with management node on each of them. It went down someway. I ran following commands to start the cluster: Start the management node on srv1: srv1: mysqlc/bin/ndb_mgmd --initial -f my_cluster/conf/config.ini --configdir=/home/mysql_cluster/my_cluster/conf Start the management node on srv2: srv2: mysqlc/bin/ndb_mgmd --initial -f my_cluster/conf/config.ini --configdir=/home/mysql_cluster/my_cluster/conf Start the ndbd nodes on srv1: srv1: mysqlc/bin/ndbd --initial -c localhost:1186 Start the ndbd nodes on srv2: srv2: mysqlc/bin/ndbd --initial -c localhost:1186 Start mysqld server on srv1: srv1: mysqlc/bin/mysqld --defaults-file=my_cluster/conf/my.cnf --user=root & and here is the problem. mysql server not loading the data. Only database names are present. All the tables which are ENGINE=ndbcluster are not being loaded. Tables with ENGINE=myisam are being loaded. Backup scripts helped me load the data. But this way I can't use cluster setup. Similar issue appeared when i started srv2. How can I resolve this issue ?

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• How do you setup FTP with IIS Manager Users in an NLB environment with shared IIS configs?

  - by William Jens

  I've setup a 2 node NLB cluster and used the following to share IIS configs between them. http://blogs.technet.com/b/meamcs/archive/2012/05/30/configuring-iis-7-5-shared-configuration.aspx The IIS configs and content is located on a network share via a UNC path. This works - updating IIS settings on one node, is visible in another node and my website works on the individual nodes and the cluster as whole. I'm able to setup an FTP site and successfully connect with my Windows login. However, I want to use IIS Manager Authentication as defined in: http://www.iis.net/learn/publish/using-the-ftp-service/configure-ftp-with-iis-manager-authentication-in-iis-7 I've tried using "Network Service" with the FTP COM object as well as a dedicated user account that exists on all three hosts, but every time I try to login with an IIS user I get something like the following: IISWMSVC_AUTHENTICATION_UNABLE_TO_READ_CONFIG An unexpected error occurred while retrieving the authentication information. Exception:System.Runtime.InteropServices.COMException (0x8007052E): Filename: Error: at Microsoft.Web.Administration.Interop.AppHostWritableAdminManager.GetAdminSection(String bstrSectionName, String bstrSectionPath) at Microsoft.Web.Administration.Configuration.GetSectionInternal(ConfigurationSection section, String sectionPath, String locationPath) at Microsoft.Web.Management.Server.ConfigurationAuthenticationProvider.GetSection(ServerManager serverManager) Process:dllhost User=NT AUTHORITY\NETWORK SERVICE Can anyone point me in the right direction here?

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• Referencing groups/classes from Puppet dashboard in my site manifest

  - by Banjer

  I'm using Puppet Dashboard as my ENC and I'm not sure how to reference or use class and group classifications from /etc/puppet/manifests/site.pp. I have two groups defined in the dashboard: CentOS6 and SLES11. What should my site.pp look like if I want to include a certain list of modules in the CentOS6 group and a certain list of modules in the SLES11 group? I'm trying to do something like this: # /etc/puppet/manifests/site.pp node basenode { include hosts include ssh::server include ssh::client include authentication include sudo include syslog include mail } node 'CentOS6' inherits basenode { include profile } node 'SLES11' inherits basenode { include usrmounts } I have OS-specific case statements within my modules, but there are some modules that will only be applied to a certain distro. So I suppose I have two questions: Is this the best way to apply modules/resources in an OS-specific manner? Or does the above make you want to vomit? Regardless of #1, I'm still curious as how to reference classes, groups, and nodes from Dashboard within my manifests. I've read the External Nodes doc, but I'm not seeing how they correspond to manifests. Thanks all.

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• Upstart: cannot run as root

  - by Ronni Egeriis

  I have made this upstart script, which starts a Node.js service. But all of the sudden the service has stopped, and upstart has failed to restart it. Now that I am trying to start it manually, it fails to recognize my service: start: Unknown job: queue The script is properly placed in /etc/init, and should have the correct rights: -rw-r--r-- 1 root root 200 Aug 7 13:30 queue.conf When I check the config file with init-checkconf however, it says that it is not able to run as root: root@production1:~# init-checkconf /etc/init/queue.conf ERROR: cannot run as root What causes this error and how do I solve it? Debug info: Ubuntu 12.04.3 LTS root@production1:~# service --version service ver. 0.91-ubuntu1 Edit Here's queue.conf: description "Echo.it command queue" author "Ronni Egeriis Persson <[email protected]>" stop on shutdown respawn respawn 20 5 exec sudo -u beanstalk /usr/bin/node /var/www/queue/index.js >> /var/log/queue.log 2>&1 The command sudo -u beanstalk /usr/bin/node /var/www/queue/index.js >> /var/log/queue.log 2>&1 works fine when run manually.

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• Virtual machines with failover setup

  - by kimmmo

  We have three servers and our plan is to run a number of virtual machines on them in such manner, that if one of the nodes blow up, we can either quickly or seamlessly get a spare running on another node. In addition to the normal networking, they're interconnected via dual 10Gbit NIC's, so networked raid/mirroring shouldn't be a problem. The guest VM's are mostly going to be running text mode linux, but of course it wouldn't hurt to be able to spin up a non-mission critical windows guest for running Visual Studio or checking IE compatibility of a web app. We've spent some time trying to get some magical cloud setup running using Stackops and Crowbar but it started to look like they were offering way too much and were too complicated for our needs. The next candidate, I think, is Ubuntu 11.04 server + KVM + Ganeti + Drbd, unless you can come up with a suggestion for a better solution that we have missed. Requirements: Installation should be simple or at least understandable without being in the dev team A browser interface for creating and managing VM's is a nice bonus Single node's hardware failure should cause minimal downtime for VM's that were running on that node Adding more nodes should be possible without shutting down the VM's.

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• master-slave datastore replication, automatic failover, and wackamole

  - by z8000

  I have 2 dedicated servers provisioned for my next project's datastores. The datastores are configured for master-slave replication. There's no inherent automatic failover but I of course want this. That is, I'd love for access to the master datastore to always just work without having to configure a client library to detect when a master is down and failover to the slave. I've seen Wackamole which is based on the Spread Toolkit. You provide Wackamole with a set of IPs and a bunch of nodes, and regardless of the up/down state of any of the nodes, those IPs will stay available/up. Wackamole detects when a node goes down and ARPs the IP(s) that were up on the now-down node. It's pretty neat actually. So, my thought was to use Wackamole to keep the 2 virtual private IPs available/up. Clients would then just always use the same private IP to access the master datastore and the same but distinct IP for the slave datastore, even if those IPs were hosted on the same node. My datastore servers are accessed over a private network. I am unsure if this messes with Wackamole though. Is this lunacy? How do you generally handle automatic failover of private services like a datastore. FWIW, it shouldn't matter but the datastore is Redis. I don't want to hear "use mySQL" please :) Thanks.

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• 10GE network: Is it still deadly expensive? Any options?

  - by BarsMonster

  Hi! I am building home cluster where I going to have about 16 nodes which can live with 1G ports, but I really want to have 10GE on file server & central node. It's all local, so no need for cabels longer than 3-5m. And ofcourse I want to spend as little money as possible (not going to spend more than whole cluster costs) :-) What are my options? 1) Legacy solution is to take some 24-48 port 1GE switch, and connect to file/central nodes via 4-8 aggregated links. This will work I guess, cost is very acceptable, but I am not sure if it's ok to use that much aggregated links. And ofcourse it would be hard to double bandwidth when needed... :-D 2) Switch with several 10GE uplink 'ports'. As far as I see, they all require modules which costs about 1000$, so I will need 4 10G modules, and 2 10GE cards... Smells like way more than 5000$+... 3) Connect file & central node via 2 10G cards directly, and put 4 quadport 1GE NICs on fileserver. I am saving on 2 10G modules and a switch, fileserver will have to do packet routing, but it's still gonna have alot of CPU's left :-) 4) Any other options? Infiniband? 5) Are MyriNet adaptors works fine? I guess there are no cheaper options? 6) Hmm... Scrap fileserver, put it all on central node and provide dedicated 1GE port for each of the nodes... This is sad...

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