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Articles indexed Wednesday December 19 2012

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• Why do the usable sizes differ

  - by Raigex

  Again, dont really know how to phrase the question so I will explain. I have a video recorder application. I open my camera with cameraRecorder = Camera.open(1); //(this is the front facing camera) And get the camera parameters and all supported preview sizes CameraParameters tmpParams = cameraRecorder.getParameters(); List<Camera.Size> tmpList = tmpParams.getSupportedPreviewSizes(); one of the preview sizes on the Galaxy Tab 10.1 running ICS (4.0.4) is 800x600 but when I try to set the Video size in my media Player mediaRecorder.setVideoSize(800,600); I get this error: 12-19 17:27:55.035: E/CameraSource(110): Video dimension (800x600) is unsupported 12-19 17:27:55.035: E/StagefrightRecorder(110): cameraSource do not init 12-19 17:27:55.035: E/StagefrightRecorder(110): setupCameraSource failed. (-19) 12-19 17:27:55.035: E/StagefrightRecorder(110): setupMediaSource is failed. (-19) 12-19 17:27:55.035: E/StagefrightRecorder(110): setupMPEG4Recording is failed. (-19) 12-19 17:27:55.035: E/MediaRecorder(30119): start failed: -19 Does anyone know why this discrepancy might exist (I know one of the supported record sizes is 1280x720 but that is too big for me).

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• Convert Object Hierachey to Object Array

  - by Killercam

  All, I want to create an object array foo[], where the constructor for Foo is public Foo(string name, string discription){} I have a database object which has a structure (not incuding stored procedures, functions or views for simplicity) like public class Database { public string name { get; set; } public string filename { get; set; } public List<Table> tables { get; set; } public Database(string name, string filename) { this.name = name; this.filename = filename; } } protected internal class Table { public string name { get; set; } public List<Column> columns { get; set;} public Table(string name, List<Column> columns) { this.name = name; this.columns = columns; } } protected internal class Column { public string name { get; set; } public string type { get; set; } public Column(string name, string type, int maxLength, bool isNullable) { this.name = name; this.type = type; } } I would like to know the quickest way to add Column and Table information to the Foo[] object array? Clearly I can do List<Foo> fooList = new List<Foo>(); foreach (Table t in database.tables) { fooList.Add(new Foo(t.Name, "Some Description")); foreach (Column c in t.columns) fooList.Add(new Foo(c.Name, "Some Description")); } Foo[] fooArr = fooList.ToArray<Foo>(); But is there a quicker way? Clearly LINQ is likely to be slower for a query that does a simalar operation, but I care allot about speed here so any advice would be appreciated. Perhaps the use of a HashSet would be the way to go as there will not be duplicate entries... Thanks for your time.

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• MySQLDB query not returning all rows

  - by RBK

  I am trying to do a simple fetch using MySQLDB in Python. I have 2 tables(Accounts & Products). I have to look up Accounts table, get acc_id from it & query the Products table using it. The Products tables has more than 10 rows. But when I run this code it randomly returns between 0 & 6 rows each time I run it. Here's the code snippet: # Set up connection con = mdb.connect('db.xxxxx.com', 'user', 'password', 'mydb') # Create cursor cur = con.cursor() # Execute query cur.execute("SELECT acc_id FROM Accounts WHERE ext_acc = '%s'" % account_num ) # account_num is alpha-numberic and is got from preceding part of the program # A tuple is returned, so get the 0th item from it acc_id = cur.fetchone()[0] print "account_id = ", acc_id # Close the cursor - I was not sure if I can reuse it cur.close() # Reopen the cursor cur = con.cursor() # Second query cur.execute("SELECT * FROM Products WHERE account_id = %d" % acc_id) keys = cur.fetchall() print cur.rowcount # This prints incorrect row count for key in keys: # Does not print all rows. Tried to directly print keys instead of iterating - same result :( print key # Closing the cursor & connection cur.close() con.close() The weird part is, I tried to step through the code using a debugger(PyDev on Eclipse) and it correctly gets all rows(both the value stored in the variable 'keys' as well as console output are correct). I am sure my DB has correct data since I ran the same SQL on MySQL console & got the correct result. Just to be sure I was not improperly closing the connection, I tried using with con instead of manually closing the connection and it's the same result. I did RTFM but I couldn't find much in it to help me with this issue. Where am I going wrong? Thank you. EDIT: I noticed another weird thing now. In the line cur.execute("SELECT * FROM Products WHERE account_id = %d" % acc_id), I hard-coded the acc_id value, i.e made it cur.execute("SELECT * FROM Products WHERE account_id = %d" % 322) and it returns all rows

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• Another thread safe queue implementation

  - by jensph

  I have a class, Queue, that I tried to make thread safe. It has these three member variables: std::queue<T> m_queue; pthread_mutex_t m_mutex; pthread_cond_t m_condition; and a push and pop implemented as: template<class T> void Queue<T>::push(T value) { pthread_mutex_lock( &m_mutex ); m_queue.push(value); if( !m_queue.empty() ) { pthread_cond_signal( &m_condition ); } pthread_mutex_unlock( &m_mutex ); } template<class T> bool Queue<T>::pop(T& value, bool block) { bool rtn = false; pthread_mutex_lock( &m_mutex ); if( block ) { while( m_queue.empty() ) { pthread_cond_wait( &m_condition, &m_mutex ); } } if( !m_queue.empty() ) { value = m_queue.front(); m_queue.pop(); rtn = true; } pthread_mutex_unlock( &m_mutex ); return rtn; } Unfortunately there are occasional issues that may be the fault of this code. That is, there are two threads and sometimes thread 1 never comes out of push() and at other times thread 2 never comes out of pop() (the block parameter is true) though the queue isn't empty. I understand there are other implementations available, but I'd like to try to fix this code, if needed. Anyone see any issues? The constructor has the appropriate initializations: Queue() { pthread_mutex_init( &mMutex, NULL ); pthread_cond_init( &mCondition, NULL ); } and the destructor, the corresponding 'destroy' calls.

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• C++. How to define template parameter of type T for class A when class T needs a type A template parameter?

  - by jaybny

  Executor class has template of type P and it takes a P object in constructor. Algo class has a template E and also has a static variable of type E. Processor class has template T and a collection of Ts. Question how can I define Executor< Processor<Algo> > and Algo<Executor> ? Is this possible? I see no way to defining this, its kind of an "infinite recursive template argument" See code. template <class T> class Processor { map<string,T> ts; void Process(string str, int i) { ts[str].Do(i); } } template <class P> class Executor { Proc &p; Executor(P &p) : Proc(p) {} void Foo(string str, int i) { p.Process(str,i); } Execute(string str) { } } template <class E> class Algo { static E e; void Do(int i) {} void Foo() { e.Execute("xxx"); } } main () { typedef Processor<Algo> PALGO; // invalid typedef Executor<PALGO> EPALGO; typedef Algo<EPALGO> AEPALGO; Executor<PALGO> executor(PALGO()); AEPALGO::E = executor; }

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• Could not load SWT library on Windows 32-bit

  - by Firzen

  I am almost done with one Java project that I have been developing on Linux. Now I need to build and test it on Windows. So I have installed Eclipse on Windows XP 32-bit, and imported my project. All dependencies of project are in jar files in lib folder, and on Linux everything works well, but on Windows XP I get following error: Exception in thread "main" java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons: no swt-pi-gtk-4234 in java.library.path no swt-pi-gtk in java.library.path Can't load library: C:\Documents and Settings\firzen\.swt\lib\win32\x86\swt-pi-gtk-4234.dll Can't load library: C:\Documents and Settings\firzen\.swt\lib\win32\x86\swt-pi-gtk.dll at org.eclipse.swt.internal.Library.loadLibrary(Library.java:331) at org.eclipse.swt.internal.Library.loadLibrary(Library.java:240) at org.eclipse.swt.internal.gtk.OS.<clinit>(OS.java:22) at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63) at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54) at org.eclipse.swt.widgets.Display.<clinit>(Display.java:133) at gui.Frontend.<init>(Frontend.java:51) at Fighter.main(Fighter.java:18) I have searched for these DLLs, but I have failed to find them. Where can I download these DLL files? Thanks in advance.

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• Prolog singleton variables in Python

  - by Rubens

  I'm working on a little set of scripts in python, and I came to this: line = "a b c d e f g" a, b, c, d, e, f, g = line.split() I'm quite aware of the fact that these are decisions taken during implementation, but shouldn't (or does) python offer something like: _, _, var_needed, _, _, another_var_needed, _ = line.split() as well as Prolog does offer, in order to exclude the famous singleton variables. I'm not sure, but wouldn't it avoid unnecessary allocation? Or creating references to the result of the split call does not count up as overhead? EDIT: Sorry, my point here is: in Prolog, as far as I'm concerned, in an expression like: test(L, N) :- test(L, 0, N). test([], N, N). test([_|T], M, N) :- V is M + 1, test(T, V, N). The variable represented by _ is not accessible, for what I suppose the reference to the value that does exist in the list [_|T] is not even created. But, in Python, if I use _, I can use the last value assigned to _, and also, I do suppose the assignment occurs for each of the variables _ -- which may be considered an overhead. My question here is if shouldn't there be (or if there is) a syntax to avoid such unnecessary attributions.

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• Using Angularjs with server side templates

  - by codecollision

  For SEO purposes the server renders out the full html template for a given URL on initial load. The site uses angularjs which detects the URL route and renders a client template from the JSON API. For example, you navigate to: /blog/post-title Server responds with post-title content. Angular loads, detects route: /blog/:post_slug and begins to load JSON and render client side template from response. Obviously what Angular does is fine when links are followed after the initial load, but on first load it duplicates effort. My question is if there is a clean way to prevent this situation.

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• CSV file download ignored in ie8/9

  - by JBB

  I have some code in a button click event which gets a csv string from a hidden input and writes it to the response as a CSV file. This work fine in Chrome, Firefox, ie7, ie9 in quirks mode. However it does not work in ie8 or ie9 default. Looking at this in fiddler the csv is being written to the response but the another get request is being made immediately after and the page reloads. No file saving dialog appears. protected void btnCsvHidden_Click(object sender, EventArgs e) { var csv = csvString.Value; var filename = "Reporting"; Response.Clear(); Response.ClearHeaders(); Response.AddHeader("Cache-Control", "no-store, no-cache"); Response.AddHeader("content-disposition", "attachment; filename=\"" + filename + ".csv\""); Response.ContentType = "text/csv"; Response.Write(csv); Response.End(); }

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• How to get OCI lib to work on red hat machine to work with R Oracle?

  - by Matt Bannert

  I need to get OCI lib working on my rhel 6.3 machine and I am experiencing some trouble with OCI headers files that can't be found. I have installed (using yum install) oracle-instantclient11.2-basic-11.2.0.3.0-1.x86_64.rpm because this official page it's all I need to run OCI. To test the whole thing in general I've installed sqplus64, which worked after I set export LD_LIBRARY_PATH=/usr/lib/oracle/11.2/client64/lib. Unfortunately the headers files couldn't be found after setting LD_LIBRARY_PATH. Actually I am not surprised because there is no include directory in any of these oracle paths. So the question is: Where do I get these missing header files from? Are they actually already there and I just can find them? Btw: I am doing this whole exercise because I want to use ROracle on my R Studio server and this R package depends on the OCI library. Once I am back in R territory the road gets much less bumpier for me. EDIT: this documentation helped me a little further. However, I guess I found some header files now in: "/usr/include/oracle/11.2/client64". But which variable do I have to set to this location?

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• joomla and allow_url_fopen [closed]

  - by liz

  so i have been reading of the pros and cons of allowing: allow_url_fopen. but i am still confused. after a recent hacking incident (which i believe had nothing to do with allow_url_fopen) my host turned allow_url_fopen off. so the thing i dont get is, in joomla 2.5.x there is an updating feature.you can search for new versions and be notified if things are out of date. there is a big security hole if joomla or its extensions get out of date. But the catch it needs allow_url_fopen turned on. so why did joomla build a security risk into a feature to improve security??is it okay to turn allow_url_fopen on and have the updating feature? to clarify: my question is. i have Joomla installed. I have CURl installed. when i run the discover updates through NATIVE joomla i get a request for fopen. shouldn't i not need to enable a security risk? i am running version 2.5.8 of joomla.

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• finding out memory allocation hotspots in java

  - by Zamir

  Our GC is working hard and we have some pauses that we want to decrease. We have some memory allocation issues that we want to solve before or while we are tweaking with the actual JVM GC args. I would like to know which objects are making the GC sweat: is there a way to know which objects are evacuated every time the GC is working? is there a way to know which objects are moved between areas every time the GC is working? Is there a way to know which objects are in Eden area? I am working extensively with Jprofiler and Memory Analyzer. I would like to get this information on a running application in my staging environment.

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• How to automatically read in calculated values with PHPExcel?

  - by Edward Tanguay

  I have the following Excel file: I read it in by looping over every cell and getting the value with getCell(...)->getValue(): $highestColumnAsLetters = $this->objPHPExcel->setActiveSheetIndex(0)->getHighestColumn(); //e.g. 'AK' $highestRowNumber = $this->objPHPExcel->setActiveSheetIndex(0)->getHighestRow(); $highestColumnAsLetters++; for ($row = 1; $row < $highestRowNumber + 1; $row++) { $dataset = array(); for ($columnAsLetters = 'A'; $columnAsLetters != $highestColumnAsLetters; $columnAsLetters++) { $dataset[] = $this->objPHPExcel->setActiveSheetIndex(0)->getCell($columnAsLetters.$row)->getValue(); if ($row == 1) { $this->column_names[] = $columnAsLetters; } } $this->datasets[] = $dataset; } However, although it reads in the data fine, it reads in the calculations literally: I understand from discussions like this one that I can use getCalculatedValue() for calculated cells. The problem is that in the Excel sheets I am importing, I do not know beforehand which cells are calculated and which are not. Is there a way for me to read in the value of a cell in a way that automatically gets the value if it has a simple value and gets the result of the calculation if it is a calculation? Answer: It turns out that getCalculatedValue() works for all cells, makes me wonder why this isn't the default for getValue() since I would think one would usually want the value of the calculations instead of the equations themselves, in any case this works: ...->getCell($columnAsLetters.$row)->getCalculatedValue();

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• difference between ObservableCollection and BindingList

  - by Azhar

  I want to know the difference between ObservableCollection and BindingList because I've used both to notify for any add/delete change in Source, but I actually do not know when to prefer one over the other. Why would I choose one of the following over the other? ObservableCollection<Employee> lstEmp = new ObservableCollection<Employee>(); or BindingList<Employee> lstEmp = new BindingList<Employee>();

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• Saving Data to Relational Database (Entity Framework)

  - by sheefy

  I'm having a little bit of trouble saving data to a database. Basically, I have a main table that has associations to other tables (Example Below). Tbl_Listing ID UserID - Associated to ID in User Table CategoryID - Associated to ID in Category Table LevelID - Associated to ID in Level Table. Name Address Normally, it's easy for me to add data to the DB (using Entity Framework). However, I'm not sure how to add data to the fields with associations. The numerous ID fields just need to hold an int value that corresponds with the ID in the associated table. For example; when I try to access the column in the following manner I get a "Object reference not set to an instance of an object." error. Listing NewListing = new Listing(); NewListing.Tbl_User.ID = 1; NewListing.Tbl_Category.ID = 2; ... DBEntities.AddToListingSet(NewListing); DBEntities.SaveChanges(); I am using NewListing.Tbl_User.ID instead of NewListing.UserID because the UserID field is not available through intellisense. If I try and create an object for each related field I get a "The relationship between the two objects cannot be defined because they are attached to different ObjectContext objects." error. With this method, I am trying to add the object without the .ID shown above - example NewListing.User = UserObject. I know this should be simple as I just want to reference the ID from the associated table in the main Listing's table. Any help would be greatly appreciated. Thanks in advance, -S

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• Where I can find SQL Generated by Entity framework?

  - by Jalpesh P. Vadgama

  Few days back I was optimizing the performance with Entity framework and Linq queries and I was using LinqPad and looking SQL generated by the Linq or entity framework queries. After some point of time I got the same question in mind that how I can find the SQL Statement generated by Entity framework?. After some struggling I have managed to found the way of finding SQL Statement so I thought it would be a great idea to write a post about  same and share my knowledge about that. So in this post I will explain how to find SQL statements generated Entity framework queries. Read More on dotnetjalps.com

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• Applications are now open for the Microsoft Accelerator for Windows Azure - 2013

  - by ScottGu

  In October, I introduced the finalists for the Microsoft Accelerator for Windows Azure, powered by TechStars. Over the past couple of months, these startups have been mentored by business and technology leaders, met with investors, learned from each other, and, most importantly, been building great products. You can learn more about the startups in the first class and how they’re using Windows Azure here. As the first class approaches Demo Day on January 17th, I’m happy to announce that today we are opening applications for the second class of the Microsoft Accelerator for Windows Azure. The second class will begin on April 1,, 2013 and conclude with Demo Day on June 26, 2013. If you are currently working at a startup or considering founding your own company, I encourage you to apply. We’re accepting applications through February 1st, 2013. You can find more information about the Accelerator and the application process here. It’s been truly inspiring to work with the current class of startups. This inaugural class has brought with them incredible energy and innovation and I look forward to reviewing the applications for this next class. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• How do I remove a printer connection without the user's intervention?

  - by 1.618

  Here's the situation: We're replacing 11 printers with newer models, and we'll be installing them on our print server and sharing them out. The plan is to share the new printers under different names than the ones they're replacing, and un-share the old ones. So I need to come up with a way to remove the client connections to old printers automatically. Clients are mostly Windows 7 with a few XP. My first idea was to call prnmngr.vbs from the login script to remove each old printer explicitly by name. The problem is that some users don't log out when they're done for the day, so I can't count on their login script running before they next need to print. I could remotely run prnmngr.vbs using SCCM, but if it's not 'impersonating' the user, I don't think it will remove their printers. Any ideas? Could I lookup how to access WMI using c# code and write a "trojan" to remove specific printers without requiring the user to do anything? (I'm only half joking). I'm open to any suggestion! Thanks!

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• Understanding how IE's SmartScreen works

  - by Kevin Donn

  Today I downloaded an update to our mail server on my dev machine using IE9 on Win7 Pro. I directed IE to save the file on our server's shared drive so I could install it later. When the download finished, IE showed a red banner at the bottom and said that, ".exe is not commonly downloaded and could harm your computer." There were three buttons, "Delete", "Actions", and "View downloads". I selected "Actions" just because I had never seen this before. It showed a "SmartScreen Filter" dialog basically giving three choices: "Don't run this program (recommended)", "Delete program", and "Run anyway". I just canceled the dialog because I didn't want to run it in the first place; I just wanted to download it so I could run it later on the server. So when I did try to run it, it would blow up immediately saying, "Setup was unable to create the directory - Error 5: Access is denied." I tried unblocking the file, "Run as Administrator" even though I already was Administrator, turning off UAC, etc. Cutting to the chase, I finally downloaded the file again, ran WinMerge on the two and it showed they were identical, except the new one ran fine. I went back to my dev machine, downloaded the file through Firefox and then ran it on the server, again fine. But when I tried again through IE, again SmartScreen showed its red banner and somehow clobbered the file even though it was stored on another machine, and WinMerge can't tell the difference between it and a good file. I've looked around on the web for how SmartScreen works, but they all give user-level descriptions of it. What I want to know is, what does it do to that file to make it unrunnable on another machine? Thanks

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• amplified reflected attack on dns

  - by Mike Janson

  The term is new to me. So I have a few questions about it. I've heard it mostly happens with DNS servers? How do you protect against it? How do you know if your servers can be used as a victim? This is a configuration issue right? my named conf file include "/etc/rndc.key"; controls { inet 127.0.0.1 allow { localhost; } keys { "rndc-key"; }; }; options { /* make named use port 53 for the source of all queries, to allow * firewalls to block all ports except 53: */ // query-source port 53; /* We no longer enable this by default as the dns posion exploit has forced many providers to open up their firewalls a bit */ // Put files that named is allowed to write in the data/ directory: directory "/var/named"; // the default pid-file "/var/run/named/named.pid"; dump-file "data/cache_dump.db"; statistics-file "data/named_stats.txt"; /* memstatistics-file "data/named_mem_stats.txt"; */ allow-transfer {"none";}; }; logging { /* If you want to enable debugging, eg. using the 'rndc trace' command, * named will try to write the 'named.run' file in the $directory (/var/named"). * By default, SELinux policy does not allow named to modify the /var/named" directory, * so put the default debug log file in data/ : */ channel default_debug { file "data/named.run"; severity dynamic; }; }; view "localhost_resolver" { /* This view sets up named to be a localhost resolver ( caching only nameserver ). * If all you want is a caching-only nameserver, then you need only define this view: */ match-clients { 127.0.0.0/24; }; match-destinations { localhost; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; /* these are zones that contain definitions for all the localhost * names and addresses, as recommended in RFC1912 - these names should * ONLY be served to localhost clients: */ include "/var/named/named.rfc1912.zones"; }; view "internal" { /* This view will contain zones you want to serve only to "internal" clients that connect via your directly attached LAN interfaces - "localnets" . */ match-clients { localnets; }; match-destinations { localnets; }; recursion yes; zone "." IN { type hint; file "/var/named/named.ca"; }; // include "/var/named/named.rfc1912.zones"; // you should not serve your rfc1912 names to non-localhost clients. // These are your "authoritative" internal zones, and would probably // also be included in the "localhost_resolver" view above :

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• Linux Experts Riddle: Network output of 10MB/s on 10GB/s NIC

  - by user150324

  I have two CentOS 6 servers. I am trying to transfer files between them. Source server has 10GB/s NIC nd destination server has 1GB/s NIC. Regardless to the command used nor the protocol, the transfer speed is ~1 Mega byte per second. The goal is at least couple dozens MB per second. I have tried: rsync (also with various encryptions), scp, wget, aftp, nc. Here's some testing results with iperf: [root@serv ~]# iperf -c XXX.XXX.XXX.XXX -i 1 ------------------------------------------------------------ Client connecting to XXX.XXX.XXX.XXX, TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 3] local XXX.XXX.XXX.XXX port 33180 connected with XXX.XXX.XXX.XXX port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 1.0 sec 1.30 MBytes 10.9 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 1.0- 2.0 sec 1.28 MBytes 10.7 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 2.0- 3.0 sec 1.34 MBytes 11.3 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 3.0- 4.0 sec 1.53 MBytes 12.8 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 4.0- 5.0 sec 1.65 MBytes 13.8 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 5.0- 6.0 sec 1.79 MBytes 15.0 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 6.0- 7.0 sec 1.95 MBytes 16.3 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 7.0- 8.0 sec 1.98 MBytes 16.6 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 8.0- 9.0 sec 1.91 MBytes 16.0 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 9.0-10.0 sec 2.05 MBytes 17.2 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.68 MBytes 14.0 Mbits/sec I guess HD is not the bottleneck here.

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• Problems sending SMTP email to large systems such as Gmail

  - by Martel

  I maintain a mail server. Recently messages sent to valid recipients on gmail, yahoo, and now roadrunner email addresses are bounced with similar messages: Here's one from gmail: The message, sent by [email protected], can not be delivered to following recipient(s): *recipient*@gmail.com There was a fatal SMTP error. Fatal DNS error: exchanger alt4.gmail-smtp-in.l.google.com. does not exist Delivery History Follows: [DLVR 000020 19-12-12 14:21:21] Delivering item 5573 [DLVR 000020 19-12-12 14:21:21] Resolving MX records for domain gmail.com [DLVR 000020 19-12-12 14:21:21] Retrieved 5 MX records for domain gmail.com [DLVR 000020 19-12-12 14:21:21] Delivering mail to 1 recipient(s) at domain gmail.com using exchanger gmail-smtp-in.l.google.com. [DLVR 000020 19-12-12 14:21:33] Host gmail-smtp-in.l.google.com. does not appear to exist... [DLVR 000020 19-12-12 14:21:33] Will try next exchanger [DLVR 000020 19-12-12 14:21:33] Delivering mail to 1 recipient(s) at domain gmail.com using exchanger alt1.gmail-smtp-in.l.google.com. [DLVR 000020 19-12-12 14:21:45] Host alt1.gmail-smtp-in.l.google.com. does not appear to exist... [DLVR 000020 19-12-12 14:21:45] Will try next exchanger [DLVR 000020 19-12-12 14:21:45] Delivering mail to 1 recipient(s) at domain gmail.com using exchanger alt2.gmail-smtp-in.l.google.com. [DLVR 000020 19-12-12 14:21:57] Host alt2.gmail-smtp-in.l.google.com. does not appear to exist... [DLVR 000020 19-12-12 14:21:57] Will try next exchanger [DLVR 000020 19-12-12 14:21:57] Delivering mail to 1 recipient(s) at domain gmail.com using exchanger alt3.gmail-smtp-in.l.google.com. [DLVR 000020 19-12-12 14:22:09] Host alt3.gmail-smtp-in.l.google.com. does not appear to exist... [DLVR 000020 19-12-12 14:22:09] Will try next exchanger [DLVR 000020 19-12-12 14:22:09] Delivering mail to 1 recipient(s) at domain gmail.com using exchanger alt4.gmail-smtp-in.l.google.com. [DLVR 000020 19-12-12 14:22:21] Host alt4.gmail-smtp-in.l.google.com. does not appear to exist... [DLVR 000020 19-12-12 14:22:21] Fatal error - host alt4.gmail-smtp-in.l.google.com. does not exist. Will bounce... [DLVR 000020 19-12-12 14:22:21] Bouncing to sender using bounce address [email protected]... Sometimes these emails get through, other times not. I'm at a loss to explain it.

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• UFW: force traffic thru OpenVPN tunnel / do not leak any traffic

  - by hotzen

  I have VPN access using OpenVPN and try to create a safe machine that does not leak traffic over non-VPN interfaces. Using the firewall UFW I try to achieve the following: Allow Access from LAN to the machine's web-interface Otherwise only allow Traffic on tun0 (OpenVPN-Tunnel interface when established) Reject (or forward?) any traffic over other interfaces Currently I am using the following rules (sudo ufw status): To Action From -- ------ ---- 192.168.42.11 9999/tcp ALLOW Anywhere # allow web-interface Anywhere on tun0 ALLOW Anywhere # out only thru tun0 Anywhere ALLOW OUT Anywhere on tun0 # in only thru tun0 My problem is that the machine is initially not able to establish the OpenVPN-connection since only tun0 is allowed, which is not yet established (chicken-egg-problem) How do I allow creating the OpenVPN connection and from this point onward force every single packet to go thru the VPN-tunnel?

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• Editing remotely the PHP files on a Centos server

  - by Alex2012

  I have a intranet web server (Centos 6, Apache, PHP) to which I would like to give access to a developer. He will connect by remote desktop from Windows 7 to Ubuntu 12.4 and from here by SSH to /var/www/html folder where it has to create and edit the files. This solution was chosen because: - I could not make a remote desktop connection from Windows to Centos - The web developer need some editor for PHP files and is not allowed to install software on Windows 7 machine - it is more a test solution ( we are all learning to use Linux). When the developer is connected from Ubuntu to Centos by SSH (SFTP) he could save the changes only if on Centos the account used to connect has ownership to that folder. Can you please tell how can I give all required rights. I tried different solutions found on Internet but without to much success. Are there other way to connect to Centos server?

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• How to do client side NFS failover in Linux?

  - by Doug

  I have a CentOS 6.3 client that needs to access NFS storage. There are two NFS servers that serve up the same content stored on a SAN with a clustered filesystem. How do I set up CentOS to failover to the backup NFS server if needed? When I Google, I keep reading that Linux does not support this, but that would be strange since there is plenty of information out there on how to set up a clustered Linux NFS server farm...

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