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• DNS problems on CentOS fresh install

  - by Rick Koshi

  I'm having some DNS issues on a new box I'm installing with CentOS 6.2. I am able to look up names using nslookup, dig, or host. I am able to ping machines by name or by IP address. However, when I try other tools, such as ssh, wget, or yum, they are unable to resolve names. For example: # wget http://www.google.com --2012-03-08 14:48:06-- http://www.google.com/ Resolving www.google.com... failed: Name or service not known. wget: unable to resolve host address `www.google.com' # ssh www.google.com ssh: Could not resolve hostname www.google.com: Name or service not known # ping -c 1 www.google.com PING www.l.google.com (74.125.113.106) 56(84) bytes of data. 64 bytes from vw-in-f106.1e100.net (74.125.113.106): icmp_seq=1 ttl=46 time=43.6 ms --- www.l.google.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 59ms rtt min/avg/max/mdev = 43.665/43.665/43.665/0.000 ms # host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.113.99 www.l.google.com has address 74.125.113.103 www.l.google.com has address 74.125.113.104 www.l.google.com has address 74.125.113.105 www.l.google.com has address 74.125.113.106 www.l.google.com has address 74.125.113.147 My /etc/nsswitch.conf file is the default, including this (standard) line: hosts: files dns /etc/resolv.conf is as set up by DHCP: ; generated by /sbin/dhclient-script nameserver 192.168.1.254 192.168.1.254 is a working DNS server (my DSL modem, working for years with other machines) Anyone know why ping would work, but ssh/wget would fail? Per NcA's suggestion, I tried changing /etc/resolv.conf to point to 8.8.8.8. Oddly enough, this does make it work. Obviously, my DSL modem is responding to DNS requests in some way that some parts of Linux's resolution system don't like. Looking at the tcpdump, I am unable to see what the difference is. Certainly, both servers are sending the same addresses. Here's the output from tcpdump -nn -X with the server set to the DNS server on the DSL modem. It's clearly replying with the correct addresses, but ssh/wget don't seem happy with it for some reason: 15:53:52.133580 IP 192.168.1.254.53 > 192.168.1.2.54836: 33157 7/0/0 CNAME www.l.google.com., A 74.125.115.105, A 74.125.115.106, A 74.125.115.147, A 74.125.115.99, A 74.125.115.103, A 74.125.115.104 (148) 0x0000: 4500 00b0 e33a 0000 ff11 53b1 c0a8 01fe E....:....S..... 0x0010: c0a8 0102 0035 d634 009c 7528 8185 8180 .....5.4..u(.... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0007 acd0 0008 0377 7777 016c c010 .........www.l.. 0x0050: c02c 0001 0001 0000 0001 0004 4a7d 7369 .,..........J}si 0x0060: c02c 0001 0001 0000 0001 0004 4a7d 736a .,..........J}sj 0x0070: c02c 0001 0001 0000 0001 0004 4a7d 7393 .,..........J}s. 0x0080: c02c 0001 0001 0000 0001 0004 4a7d 7363 .,..........J}sc 0x0090: c02c 0001 0001 0000 0001 0004 4a7d 7367 .,..........J}sg 0x00a0: c02c 0001 0001 0000 0001 0004 4a7d 7368 .,..........J}sh 15:53:52.135669 IP 192.168.1.254.53 > 192.168.1.2.54836: 65062- 0/0/0 (32) 0x0000: 4500 003c e33b 0000 ff11 5424 c0a8 01fe E..<.;....T$.... 0x0010: c0a8 0102 0035 d634 0028 98f9 fe26 8000 .....5.4.(...&.. 0x0020: 0001 0000 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 gle.com..... I'm not enough of an expert to know if this is malformed in some way, but ping seems to do the right thing with it. For comparison, here's the same thing when querying 8.8.8.8: 15:57:27.990270 IP 8.8.8.8.53 > 192.168.1.2.49028: 59114 7/0/0 CNAME www.l.google.com., A 74.125.113.105, A 74.125.113.103, A 74.125.113.106, A 74.125.113.147, A 74.125.113.104, A 74.125.113.99 (148) 0x0000: 4500 00b0 5530 0000 2f11 6453 0808 0808 E...U0../.dS.... 0x0010: c0a8 0102 0035 bf84 009c 39f8 e6ea 8180 .....5....9..... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 516a 0008 0377 7777 016c c010 ....Qj...www.l.. 0x0050: c02c 0001 0001 0000 0116 0004 4a7d 7169 .,..........J}qi 0x0060: c02c 0001 0001 0000 0116 0004 4a7d 7167 .,..........J}qg 0x0070: c02c 0001 0001 0000 0116 0004 4a7d 716a .,..........J}qj 0x0080: c02c 0001 0001 0000 0116 0004 4a7d 7193 .,..........J}q. 0x0090: c02c 0001 0001 0000 0116 0004 4a7d 7168 .,..........J}qh 0x00a0: c02c 0001 0001 0000 0116 0004 4a7d 7163 .,..........J}qc 15:57:28.018909 IP 8.8.8.8.53 > 192.168.1.2.49028: 31984 1/1/0 CNAME www.l.google.com. (102) 0x0000: 4500 0082 7b1b 0000 2f11 3e96 0808 0808 E...{.../.>..... 0x0010: c0a8 0102 0035 bf84 006e c67e 7cf0 8180 .....5...n.~|... 0x0020: 0001 0001 0001 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 517f 0008 0377 7777 016c c010 ....Q....www.l.. 0x0050: c030 0006 0001 0000 0258 0026 036e 7334 .0.......X.&.ns4 0x0060: c010 0964 6e73 2d61 646d 696e c010 0016 ...dns-admin.... 0x0070: 91f3 0000 0384 0000 0384 0000 0708 0000 ................ 0x0080: 003c .< I still don't know why the server's reply is adequate for ping but not for ssh/wget. If anyone has ideas, I'd be happy to hear them. For now, though, I can either refer to an outside DNS server or set up my own server on the new box. It's a workaround that seems like it should be unnecessary, but will allow me to proceed.

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• mercurial hg - pushing to a cloned repositor via APACHE errors with "repository is unrelated"

  - by Ash

  Two scenarios, one work one doesn't when they both should: Scenario #1: (DOES NOT work via apache) 2 repos on Server SERVER: Repo "A", Repo "B" cloned from repo A via http://SERVER/HG/A On client: Repo A cloned from http://SERVER/HG/A Repo B cloned from http://SERVER/HG/B Added a file to repo A from client and commited & pushed it up to http://SERVER/HG/A ...WORKS Added a file to repo B from client and commited & pushed it up to http://SERVER/HG/B ...ERROR with abort: repository is unrelated, it only works if I -f (force) the push Scenario #2: (works via file system) On Server SERVER: Repo "A", Repo "B" cloned from E:/HG/A On client: Repo A cloned from E:/HG/A Repo B cloned from E:/HG/B Added a file to repo A from client and commited & pushed it up to E:/HG/A ...WORKS Added a file to repo B from client and commited & pushed it up to E:/HG/B ...WORKS Conclusion:...Something in the apache configuration or in the integration between apache & mercurial is making the repo "unrelated".... Any ideas??? Why do I need to force in the first scenario but do not have to in the second?? ...and i tried both scenarios via tortoisehg as well as command line.

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• How to access different domain data using Java script

  - by shoaibmohammed

  Hello there, Here is the issue. Suppose there is a DOMAIN A which is going to be the server containing a PHP Script file. The data from Domain A is to be accessed by a Client at DOMAIN B. I know it cannot be accessed directly using JavaScript. So what I did is, in Domain A I created a a JavaScript file as front-end for the PHP Script which AJAXes the PHP and returns the data. But unfortunately it din't work I came across an example having PHP as a Middle Man in the client side. But I donot want to keep any server side PHP code as a middle man in the client side. I just want to give out the Javascript to the client domain. http://stackoverflow.com/questions/578095/how-to-get-data-with-javascript-from-another-server DOMAIN A PHP - data.php <?php echo "Server returns data"; ?> JS - example.js Does the Ajax to the PHP function getData() { //assume ajax is done for data.php and data is retrieved, now return the data return ajaxed_data; } Domain B JS Client includes the example.js file from Domain A in his HTML <script type="text/javascript" src="http://www.DomainA.com/example.js"></script> <script type="text/javascript"> alert(getData()); </script> I hope I have made myself understandable ! Can this be established ? Its something like Google friend connect, what I mean is, just provide JavaScript to the client and thats it. Every thing carried out in server side Thankx for providing this forum

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• How to correctly waitFor() a saveScreenShot() end of execution.

  - by Alain

  Here is my full first working test: var expect = require('chai').expect; var assert = require('assert'); var webdriverjs = require('webdriverjs'); var client = {}; var webdriverOptions = { desiredCapabilities: { browserName: 'phantomjs' }, logLevel: 'verbose' }; describe('Test mysite', function(){ before(function() { client = webdriverjs.remote( webdriverOptions ); client.init(); }); var selector = "#mybodybody"; it('should see the correct title', function(done) { client.url('http://localhost/mysite/') .getTitle( function(err, title){ expect(err).to.be.null; assert.strictEqual(title, 'My title page' ); }) .waitFor( selector, 2000, function(){ client.saveScreenshot( "./ExtractScreen.png" ); }) .waitFor( selector, 7000, function(){ }) .call(done); }); after(function(done) { client.end(done); }); }); Ok, it does not do much, but after working many hours to get the environement correctly setup, it passed. Now, the only way I got it working is by playing with the waitFor() method and adjust the delays. It works, but I still do not understand how to surely wait for a png file to be saved on disk. As I will deal with tests orders, I will eventually get hung up from the test script before securely save the file. Now, How can I improve this screen save sequence and avoid loosing my screenshot ? Thanks.

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• Where should I store shared resources between LocalSystem and regular user with UAC?

  - by rwired

  My application consists of two parts: A Windows Service running under the LocalSystem account and a client process running under the currently logged in regular user. I need to deploy the application across Windows versions from XP up to Win7. The client will retrieve files from the web and collect user data from the user. The service will construct files and data of it's own which the client needs to read. I'm trying to figure out the best place (registry or filesystem, or mix) to store all this. One file the client or service needs to be able to retrieve from the net is an update_patch executable which needs to run whenever an upgrade is available. I need to be sure the initial installer SETUP.EXE, and also the update_patch can figure out this ideal location and set a RegKey to be read later by both client and server telling them the magic location (The SETUP.EXE will run with elevated privileges since it needs to install the service) On my Win7 test system the service %APPDATA% points to: C:\Windows\system32\config\systemprofile\AppData\Roaming and the %APPDATA% of the client points to: C:\Users\(username)\AppData\Roaming Interestingly Google Chrome stores everything (App and Data) in C:\Users\(username)\AppData\Local\Google\Chrome Chrome runs pretty much in exactly the way I want my suite to run (able to silently update itself in the background) What I'm trying to avoid is nasty popups warning the user that the app wants to modify the system, and I want to avoid problems when VirtualStore doesn't exist because the user is running XP/2000/2003 or has UAC turned off. My target audience are non-tech-savvy general Windows users.

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• Nohup & Sass: Process keeps running but, after a while, *.scss files do not get compiled

  - by maurits

  I am using Sass on a CentOS 5.8 server and want it to keep running after SSH logout, so that other users can edit *.scss files for days or even weeks to come without any need to start the program each time they login (in fact, they don't even have SSH access). I have used the following command from this question/answer: $ nohup sass --watch path/to/scss/files:path/to/css/output/files & Then, I log out of the SSH session and the process keeps running. It all works fine (logging in again and using touch to create a test file (test.scss) correctly triggers the creation of the corresponding test.css file) for the first few minutes, but after a while the *.scss files stop getting compiled... However, ps aux | grep 'sass' Shows that the process is still running. Anybody knows what am I doing wrong?

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• How to push to github from a server account with multiple users?

  - by kirdie

  We have a web server which contains a web application stored as a github project. Now all of us can push from our local machines to github and then pull on the server but sometimes we want to make small changes and immediately see the effect so it would be great to be able to push at the server too. Now I created an ssh key for the server but I don't want to add the servers ssh key to my github account because then all github actions done from the server are counted to my account. Is it possible to add the ssh key to the github web application project without creating a new user for the server and what is the best practice for this situation? I also don't want to copy my private key to the server obviously.

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• how do use Ninject with class libraries I am developing?

  - by Greg

  Hi, If I am working on a class library how do I make use of Ninject here? Ie from the internal class library point of view and also from the client code? For example: should the class library have it's own IOC set up, or should it always assume the client code will supply? if no (ie it's upto the client to have the IOC in place) then where is the mapping data stored here'. Is this mapping of the class library's functionality to be places in the client? have a reusable library that is available, that uses interfaces with classes that use the getInstance concept to create concrete classes for you to use, then in this case would that make sense on the client side to use the IOC container to create instances of these classes? Or is that really applying a double layer of abstraction? Q2 Or in the cases where I'm building the reusable library myself and want the client to use an IOC container, then in my reusable library would I then dispense with any overhead of having factories or "getInstance" methods to instantiate the classes in the client? (i.e. as the IOC container would do this no?)

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• Yii CGridView and dropdown filter

  - by Dmitriy Gunchenko

  I created dropdown filter, it's display, but don't worked right. As I anderstand trouble in search() method view: $this->widget('zii.widgets.grid.CGridView', array( 'dataProvider'=>$model->search(), 'filter' => $model, 'columns'=>array( array( 'name' => 'client_id', 'filter' => CHtml::listData(Client::model()->findAll(), 'client_id', 'name'), 'value'=>'$data->client->name' ), 'task' ) )); I have to tables, and they relations are shown down model: public function relations() { // NOTE: you may need to adjust the relation name and the related // class name for the relations automatically generated below. return array( 'client' => array(self::BELONGS_TO, 'Client', 'client_id'), ); } public function search() { // Warning: Please modify the following code to remove attributes that // should not be searched. $criteria=new CDbCriteria; $criteria->with = array('client'); $criteria->compare('task_id',$this->task_id); $criteria->compare('client_id',$this->client_id); $criteria->compare('name',$this->client->name); $criteria->compare('task',$this->task,true); $criteria->compare('start_date',$this->start_date,true); $criteria->compare('end_date',$this->end_date,true); $criteria->compare('complete',$this->complete); return new CActiveDataProvider($this, array( 'criteria'=>$criteria, )); }

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• sending mail in contact information with c#.net problem? help please..

  - by ilkdrl

  protected void Button2_Click(object sender, EventArgs e) { string ad = TextBox1.Text; string firma = TextBox2.Text; string mail = TextBox3.Text; string tel = TextBox4.Text; string tel2 = TextBox5.Text; string fax = TextBox6.Text; string fax2 = TextBox7.Text; string web = TextBox8.Text; string mesaj = TextBox9.Text; try { string fromAddress = "[email protected]"; string fromName = "user"; string toMail = "[email protected]"; string toNme = "Mr."; string msgSubject = "Contact"; string sifre = "userpassword"; string msgBody = "you have a message; \n" + "\n" + "\n" + "Mesaji Gönderenin Adi :" + ad + "\n" + "Mesaji Gönderen Firma :" + firma + "\n" + "Mesaji Gönderenin Maili :" + mail + "\n" + "Mesaji Gönderenin Tel. Numarasi :" + tel + tel2 + "\n" + "Mesaji Gönderenin Fax Numarasi :" + fax + fax2 + "\n" + "Mesaji Gönderenin Web Adresi :" + web + "\n" + "\n" + "\n" + "" + mesaj + "" + "\n" + "\n" + "=======================================" + "\n"; SmtpClient client = new SmtpClient(); client.Credentials = new System.Net.NetworkCredential(fromAddress, sifre); client.Host = "smtp.gmail.com"; client.Port = 1772; client.EnableSsl = false; MailAddress from = new MailAddress(fromAddress, fromName); MailAddress to = new MailAddress(toMail, toNme); MailMessage message = new MailMessage(from, to); message.Subject = msgSubject; message.Body = msgBody; client.Send(message); Response.Redirect("iletisim.aspx"); } catch (Exception ex) { } AND WEB.CONFIG http://go.microsoft.com/fwlink/?LinkId=169433 -- iam trying to send email but i cant give. Where is my problem. Please help me.

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• Increase the compression performance of VPN

  - by Martin

  I am currently switching from a system with HPN-SSH tunnels and enabled compression to something VPN based. I have tried tinc and n2n so far, hamachi requires a library I do not have. In my primitive benchmarks I am not satisfied with the achievable bandwidth compared to the SSH tunnels. In tinc the low LZO setting performed best, but compression is only available in UDP mode. Ideally I would like to have a TCP-based VPN with a multi-threaded compression. Can you suggest me some ideas how to increase the performance? Would it be possible to somehow put a compression filter in front of the tun interface? Or are there any VPN implementations that might be better suited for my needs (fast compression, TCP-based, switch mode, does not have to be super-secure)? I would consider tunnelling Ethernet over SSH, but according to some articles it is not advisable.

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• Enabling SFTP Access within PLESK

  - by spelley

  I have a client who wants to ensure his upload is secure, so we are trying to enable SFTP for him on our Linux PLESK server. I have enabled SSH access to bin/bash for FTP accounts, and created a new user. When I attempt to SFTP using either the IP address or the domain name, this is the error FileZilla is giving me: Error: Authentication failed. Error: Critical error Error: Could not connect to server Here is some basic information regarding the server: Operating system Linux 2.6.24.5-20080421a Plesk Control Panel version psa v8.6.0_build86080930.03 os_CentOS 5 I had read in some places that I should reboot the SSH Service in Server - Services, however, there is no SSH Service within the list. I'm not really a server guy so it's quite possible I'm missing something obvious. Thanks for any help that you guys can provide!

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• c# Sending emails with authentication. standard approach not working

  - by Ready Cent

  I am trying to send an email using the following very standard code. However, I get the error that follow... MailMessage message = new MailMessage(); message.Sender = new MailAddress("[email protected]"); message.To.Add("[email protected]"); message.Subject = "test subject"; message.Body = "test body"; SmtpClient client = new SmtpClient(); client.Host = "mail.myhost.com"; //client.Port = 587; NetworkCredential cred = new NetworkCredential(); cred.UserName = "[email protected]"; cred.Password = "correct password"; cred.Domain = "mail.myhost.com"; client.Credentials = cred; client.UseDefaultCredentials = false; client.Send(message); Mailbox unavailable. The server response was: No such user here. This recipient email address definitely works. To make this account work I had to do some special steps in outlook. Specifically, I had to do change account settings - more settings - outgoing server - my outgoing server requires authentication & use same settings. I am wondering if there is some other strategy. I think the key here is that my host is Server Intellect and I know that some people on here use them so hopefully someone else has been able to get through this. I did talk to support but they said with coding issues I am on my own :o

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• Problem with Boost::Asio for C++

  - by Martin Lauridsen

  Hi there, For my bachelors thesis, I am implementing a distributed version of an algorithm for factoring large integers (finding the prime factorisation). This has applications in e.g. security of the RSA cryptosystem. My vision is, that clients (linux or windows) will download an application and compute some numbers (these are independant, thus suited for parallelization). The numbers (not found very often), will be sent to a master server, to collect these numbers. Once enough numbers have been collected by the master server, it will do the rest of the computation, which cannot be easily parallelized. Anyhow, to the technicalities. I was thinking to use Boost::Asio to do a socket client/server implementation, for the clients communication with the master server. Since I want to compile for both linux and windows, I thought windows would be as good a place to start as any. So I downloaded the Boost library and compiled it, as it said on the Boost Getting Started page: bootstrap .\bjam It all compiled just fine. Then I try to compile one of the tutorial examples, client.cpp, from Asio, found (here.. edit: cant post link because of restrictions). I am using the Visual C++ compiler from Microsoft Visual Studio 2008, like this: cl /EHsc /I D:\Downloads\boost_1_42_0 client.cpp But I get this error: /out:client.exe client.obj LINK : fatal error LNK1104: cannot open file 'libboost_system-vc90-mt-s-1_42.lib' Anyone have any idea what could be wrong, or how I could move forward? I have been trying pretty much all week, to get a simple client/server socket program for c++ working, but with no luck. Serious frustration kicking in. Thank you in advance.

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• USER_LOGIN audit log with incorrect auid value?

  - by hijinx

  We have a CentOS 6.2 x86_64 system that's logging what looks to be erroneous audit information. We were receiving alerts for failed logins by a user who wasn't actually trying to log in. After some diagnosis, we figured out that the source of the events is our tool that periodically checks to see if SSH is answering. When that happens, we see this log this entry: type=USER_LOGIN msg=audit(1340312224.011:489216): user pid=28787 uid=0 auid=501 ses=8395 subj=unconfined_u:system_r:sshd_t:s0-s0:c0.c1023 msg='op=login acct=28756E6B6E6F776E207A01234567 exe="/usr/sbin/sshd" hostname=? addr=127.0.0.1 terminal=ssh res=failed' This is the entry we get whenever there is an incomplete ssh connection, but usually the auid is the same as the ses= value. For some reason, on this system, it's using a particular user's auid, regardless of the login user. For example, ssh'ng to this system as [email protected] and cancelling before providing a password generates this error. Attempting to log to an unrelated account with a bogus password will also create an entry with the incorrect auid value.

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• Rails: Multiple "types" of one model through related models?

  - by neezer

  I have a User model in my app, which I would like to store basic user information, such as email address, first and last name, phone number, etc. I also have many different types of users in my system, including sales agents, clients, guests, etc. I would like to be able to use the same User model as a base for all the others, so that I don't have to include all the fields for all the related roles in one model, and can delegate as necessary (cutting down on duplicate database fields as well as providing easy mobility from changing one user of one type to another). So, what I'd like is this: User -- first name -- last name -- email --> is a "client", so ---- client field 1 ---- client field 2 ---- client field 3 User -- first name -- last name -- email --> is a "sales agent", so ---- sales agent field 1 ---- sales agent field 2 ---- sales agent field 3 and so on... In addition, when a new user signs up, I want that new user to automatically be assigned the role of "client" (I'm talking about database fields here, not authorization, though I hope to eventually include this logic in my user authorization as well). I have a multi-step signup wizard I'm trying to build with wizardly. The first step is easy, since I'm simply calling the fields included in the base User model (such as first_name and email), but the second step is trickier since it should be calling in fields from the associated model (like--per my example above--the model client with fields client_field_1 or client_field_2, as if those fields were part of User). Does that make sense? Let me know if that wasn't clear at all, and I'll try to explain it in a different way. Can anyone help me with this? How would I do this?

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• Is it effective installing firewall within same machine which offering service?

  - by Eonil

  I'm a starting a small service practically. And I have single server currently. No money to purchase separated/dedicated firewall equipment now. Is it effective installing firewall software on same machine which offering internet service? My server will offer HTTP, NFS, and SSH, and custom made server software on a several ports. (edit) All services (except NFS) should be open to internet. Not internal services. I guess my machine (virtualized within Xen) is connected to the internet directly because I can connect to my machine SSH with only IP address. (edit) NFS is not open to internet. Sorry for my mistake. NFS will be served via SSH only.

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• Where are the network boundaries in the Java Connector Architecture (JCA)?

  - by Laird Nelson

  I am writing a JCA resource adapter. I'm also, as I go, trying to fully understand the connection management portion of the JCA specification. As a thought experiment, pretend that the only client of this adapter will be a Swing Java Application Client located on a different machine. Also assume that the resource adapter will communicate with its "enterprise information system" (EIS) over the network as well. As I understand the JCA specification, the .rar file is deployed to the application server. The application server creates the .rar file's implementation of the ManagedConnectionFactory interface. It then asks it to produce a connection factory, which is the opaque object that is deployed to JNDI for the user to use to obtain a connection to the resource. (In the case of JDBC, the connection factory is a javax.sql.DataSource.) It is a requirement that the connection factory retain a reference to the application-server-supplied ConnectionManager, which, in turn, is required to be Serializable. This makes sense--in order for the connection factory to be stored in JNDI, it must be serializable, and in order for it to keep a reference to the ConnectionManager, the ConnectionManager must also be serializable. So fine, this little object graph gets installed in the application client's JNDI tree. This is where I start to get queasy. Is the ConnectionManager--the piece supplied by the application server that is supposed to handle connection management, sharing, pooling, etc.--wholly present on the client at this point? One of its jobs is to create ManagedConnection instances, and a ManagedConnection is not required to be Serializable, and the user connection handles it vends are also not required to be Serializable. That suggests to me that the whole connection pooling machinery is shipped wholesale to the application client and stuffed into its JNDI tree. Does this all mean that JCA interactions from the client side bypass the server-side componentry of the application server? Where are the network boundaries in the JCA API?

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• How the reading from and writing to sockets are synchronized?

  - by Roman

  We create a socket. On one side of the socket we have a "server" and on another side there is a "client". Both, the server and client, can write to and read from the socket. It is what i understand. I do not understand the following things: If a server reads from the socket, does it see in the socket only those stuff which was written to the socket by the client? I mean if server writes something to the socket and than reads from the socket, will it (server) see in the socket the stuff it (server) wrote there? I hope not. Let's consider the following situation. A client write something to the socket and then it writes something new to the socket and then server reads from the socket. What will the server see there? Only the "new" stuff written by the client or both "new" and "old" one? If a client (or server) writes to the socket, can it see if the written information was received by other side? For example out.println("Hello, Server!") will return true it server received this message.

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• Install multiport module on iptables

  - by tarteauxfraises

  I'am trying to install "fail2ban" on Cubidebian, a Debian port for Cubieboard (A raspberry like board). The following rule failed due to "-m multiport --dports ssh" options (It works, when i run manually the command without multiple options). $ iptables -I INPUT -p tcp -m multiport --dports ssh -j fail2ban-ssh" iptables: No chain/target/match by that name. When i make a cat on "/proc/net/ip_tables_matches", i see that multiport module is not loaded: $ cat /proc/net/ip_tables_matches u32 time string statistic state owner pkttype mac limit helper connmark mark ah icmp socket socket quota2 policy length iprange ttl hashlimit ecn udplite udp tcp What can i do to compile or to enable the multiport module? Thanks in advance for your help

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• I am using a regex snippet query string path

  - by Shelby Poston

  Using the following to load images base on two ids one is the and bookid and the out is the client. My folder structures is this. root path = flipbooks subfolders under flipbooks are books and clients in subfolder books I have and .net page title tablet. the tablet code behind checks the bookid of client and render a the tablet page with images in a flipbook fashion. because we have over 15000 records and flipbooks already created and stored in the database. I don't move the client folder under the books subfolders. I need the code below to get to the client subfolder in the query string and help to change this would be helpful. The result now is http://www.somewebsite.com/books/client/images/someimage1.jpg[^] I need the results to be http://www.somewebsite.com/client/images/someimage1.jpg[^]. I tried moving the tablet.aspx file to the root flipbooks and it works but i have provide a user name and password each time. This need to be access by the public and my root is protected. Don't want to have to change permission. I am trying to remove the /books function getParameterByName(name) { var results = RegExp('[?&]' + name + '=([^&]*)').exec(window.location.search); return results ? decodeURIComponent(results[1].replace(/\+/g, ' ')) : null; } Thanks Mission Critical

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• Chef command to create new ec2 instance with second ebs volume attached and mounted instead of the default ephemeral volume?

  - by runamok

  We currently use this command to create a new ec2 instance with chef: knife ec2 server create --node-name=prod-apache-1 --availability-zone us-east-1c --image ami-3d4ff254 --distro ubuntu12.04-gems --groups "default" --ssh-key foo --identity-file ~/.ssh/id_rsa --ssh-user ubuntu --flavor m1.small After this command we then run further chef commands to finish provisioning the server. I was wondering if it would be possible while first setting up the instance I wanted a 100 gb volume created and mounted at /mnt and to have the ephemeral storage mounted at /tmp or /mnt-ephemeral instead. If not what further commands in chef would you advise running? I know how to do this via the aws console and can probably figure out how to do it via the ec2 command line tools but I am knew to chef and a bit overwhelmed.

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• Remote viewing on a Linux server?

  - by Zeno

  I have a Slackware Linux server that doesn't have a monitor. It doesn't run any GUIs. Is there a way to remotely access the screen? I always use SSH, but there are times where the SSH services fails and I can't do anything (nor even tell what the problem is). I use Teamviewer from my Windows computer to other PCs, but is there anything I can use to remotely view this from a Windows machine? I also want to see what it's doing at boot, before the SSH service starts.

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• Wildcard subdomain setup ... want to change host IP throws off client A records... what to do...

  - by Joe

  Here is the current set up (in a nutshell). The site is set up with a wildcard subdomain, so *.website.com is accessible. Clients can then domain map their own domains with an A record to the server IP address and it will translate the to appropriate *.website.com with re directions and env variables in htaccess. Everything is working perfect... but now comes the problem. The site has grown larger than a single DQC Xeon server can handle at peak times. Looking at cloud options seems tempting, but clients are pointing their domains to a single IP address with the A record (our server). Now, this was probably bad planing from the start, but the question is, if this was to be done today, how would we set it up so that clients use a CNAME perhaps to point their domains to our server rather than an A record. And, if that is not possible for the root domain, how can we then use multiple IP addresses on our side to translate the incoming http request? Complex enough? Hope I've explained it well!

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• Nested Routes Show Action: What objects does it expect?

  - by NoahClark

  Here is the relevant line from my rake routes: client_note GET /clients/:client_id/notes/:id(.:format) notes#show When I try passing in the objects like <%= client_note_path([client, @notes.first]) %>> I get: No route matches {:action=>"show", :controller=>"notes", :client_id=>[#<Client id: 5, ... , #<Note id: 9, ...]} Which made me think to try a client ID. So, I tried: <%= client_note_path([client.id, @notes.first]) %> which gives me: No route matches {:action=>"show", :controller=>"notes", :client_id=>[5, #<Note id: 9,content: "He just bought a brand new bobcat, be sure to charg...", client_id: 5, created_at: "2012-06-11 16:18:16", updated_at: "2012-06-11 16:18:16">]} Which, made me want to try just passing in a client ID. <%= client_note_path(client.id) %> No route matches {:action=>"show", :controller=>"notes", :client_id=>5} Still not what I'm looking for. I want to be able to show an individual note which can normally be found at a url like looks like: http://localhost:3000/clients/2/notes/3/

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