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• The Top 5 MDM Sessions You Can’t Miss at OpenWorld

  - by Mala Narasimharajan

  Sessions, Demo pods, Hands On Labs, and much more – but where should you focus?  MDM has some excellent sessions planned for OOW –  here is a top 5 list to identify the sessions you just can’t afford to miss. October 3, 2012  1:15 PM - 2:15 PM    Moscone West - 3002/3004     What's There to Know About Oracle’s Master Data Management Portfolio and Roadmap? Hear about product strategy our vision for the future and how Oracle MDM is positioned to excel in helping organizations make the most of their customer,      partner, supplier or product data. October 3, 2012  5:00 PM - 6:00 PM   Westin San Francisco – Metropolitan I Oracle Customer MDM Applications: Implementation Best Practices, Data Governance, and ROI       Customers successes provide solid examples of technology at work and how organizations derive value from it. Attend this session and hear from our customers on how they built a business case, established governance and are realizing the benefits of Oracle Customer Hub. October 2, 2012  10:15 AM - 11:15 AM   Moscone West – 3001 Mastering Product Data: Strategies for Effective Product Information Management                                                                      Product data is vital for any enterprise in being able to provide a consolidated representation of products to their partners, customers and suppliers.  Hear how our customers leverage product information to be a leader in their respective area and how Oracle is critical to achieving this. October 2, 2012  11:45 AM - 12:45 PM   Moscone West – 2022 Enabling Trusted Enterprise Product Data with Oracle Fusion Product Hub                                                                                       Learn how Oracle Fusion Product Hub is paving the way for providing organizations with trusted product data as well as helping organizations make the most of the information and infrastructure they already possess. October 1, 2012  4:45 PM – 5:45 PM   InterContinental - Ballroom A Oracle Hyperion Data Relationship Management: Enabling Enterprise Transformation                                                                         Hear how Data Relationship Management drives enterprise transformation and why any organization embarking on an master data management initiative needs it, plus hear from our customers best practices as well as lessons learned.  Check out the Master Data Management Focus On document for all our sessions at OpenWorld 2012. 

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• how to use serial port in UDK using windows DLL and DLLBind directive?

  - by Shayan Abbas

  I want to use serial port in UDK, For that purpose i use a windows DLL and DLLBind directive. I have a thread in windows DLL for serial port data recieve event. My problem is: this thread doesn't work properly. Please Help me. below is my code SerialPortDLL Code: // SerialPortDLL.cpp : Defines the exported functions for the DLL application. // #include "stdafx.h" #include "Cport.h" extern "C" { // This is an example of an exported variable //SERIALPORTDLL_API int nSerialPortDLL=0; // This is an example of an exported function. //SERIALPORTDLL_API int fnSerialPortDLL(void) //{ // return 42; //} CPort *sp; __declspec(dllexport) void Open(wchar_t* portName) { sp = new CPort(portName); //MessageBox(0,L"ha ha!!!",L"ha ha",0); //MessageBox(0,portName,L"ha ha",0); } __declspec(dllexport) void Close() { sp->Close(); MessageBox(0,L"ha ha!!!",L"ha ha",0); } __declspec(dllexport) wchar_t *GetData() { return sp->GetData(); } __declspec(dllexport) unsigned int GetDSR() { return sp->getDSR(); } __declspec(dllexport) unsigned int GetCTS() { return sp->getCTS(); } __declspec(dllexport) unsigned int GetRing() { return sp->getRing(); } } CPort class code: #include "stdafx.h" #include "CPort.h" #include "Serial.h" CSerial serial; HANDLE HandleOfThread; LONG lLastError = ERROR_SUCCESS; bool fContinue = true; HANDLE hevtOverlapped; HANDLE hevtStop; OVERLAPPED ov = {0}; //char szBuffer[101] = ""; wchar_t *szBuffer = L""; wchar_t *data = L""; DWORD WINAPI ThreadHandler( LPVOID lpParam ) { // Keep reading data, until an EOF (CTRL-Z) has been received do { MessageBox(0,L"ga ga!!!",L"ga ga",0); //Sleep(10); // Wait for an event lLastError = serial.WaitEvent(&ov); if (lLastError != ERROR_SUCCESS) { //LOG( " Unable to wait for a COM-port event" ); } // Setup array of handles in which we are interested HANDLE ahWait[2]; ahWait[0] = hevtOverlapped; ahWait[1] = hevtStop; // Wait until something happens switch (::WaitForMultipleObjects(sizeof(ahWait)/sizeof(*ahWait),ahWait,FALSE,INFINITE)) { case WAIT_OBJECT_0: { // Save event const CSerial::EEvent eEvent = serial.GetEventType(); // Handle break event if (eEvent & CSerial::EEventBreak) { //LOG( " ### BREAK received ###" ); } // Handle CTS event if (eEvent & CSerial::EEventCTS) { //LOG( " ### Clear to send %s ###", serial.GetCTS() ? "on":"off" ); } // Handle DSR event if (eEvent & CSerial::EEventDSR) { //LOG( " ### Data set ready %s ###", serial.GetDSR() ? "on":"off" ); } // Handle error event if (eEvent & CSerial::EEventError) { switch (serial.GetError()) { case CSerial::EErrorBreak: /*LOG( " Break condition" );*/ break; case CSerial::EErrorFrame: /*LOG( " Framing error" );*/ break; case CSerial::EErrorIOE: /*LOG( " IO device error" );*/ break; case CSerial::EErrorMode: /*LOG( " Unsupported mode" );*/ break; case CSerial::EErrorOverrun: /*LOG( " Buffer overrun" );*/ break; case CSerial::EErrorRxOver: /*LOG( " Input buffer overflow" );*/ break; case CSerial::EErrorParity: /*LOG( " Input parity error" );*/ break; case CSerial::EErrorTxFull: /*LOG( " Output buffer full" );*/ break; default: /*LOG( " Unknown" );*/ break; } } // Handle ring event if (eEvent & CSerial::EEventRing) { //LOG( " ### RING ###" ); } // Handle RLSD/CD event if (eEvent & CSerial::EEventRLSD) { //LOG( " ### RLSD/CD %s ###", serial.GetRLSD() ? "on" : "off" ); } // Handle data receive event if (eEvent & CSerial::EEventRecv) { // Read data, until there is nothing left DWORD dwBytesRead = 0; do { // Read data from the COM-port lLastError = serial.Read(szBuffer,33,&dwBytesRead); if (lLastError != ERROR_SUCCESS) { //LOG( "Unable to read from COM-port" ); } if( dwBytesRead == 33 && szBuffer[0]=='$' ) { // Finalize the data, so it is a valid string szBuffer[dwBytesRead] = '\0'; ////LOG( "\n%s\n", szBuffer ); data = szBuffer; } } while (dwBytesRead > 0); } } break; case WAIT_OBJECT_0+1: { // Set the continue bit to false, so we'll exit fContinue = false; } break; default: { // Something went wrong //LOG( "Error while calling WaitForMultipleObjects" ); } break; } } while (fContinue); MessageBox(0,L"kka kk!!!",L"kka ga",0); return 0; } CPort::CPort(wchar_t *portName) { // Attempt to open the serial port (COM2) //lLastError = serial.Open(_T(portName),0,0,true); lLastError = serial.Open(portName,0,0,true); if (lLastError != ERROR_SUCCESS) { //LOG( "Unable to open COM-port" ); } // Setup the serial port (115200,8N1, which is the default setting) lLastError = serial.Setup(CSerial::EBaud115200,CSerial::EData8,CSerial::EParNone,CSerial::EStop1); if (lLastError != ERROR_SUCCESS) { //LOG( "Unable to set COM-port setting" ); } // Register only for the receive event lLastError = serial.SetMask(CSerial::EEventBreak | CSerial::EEventCTS | CSerial::EEventDSR | CSerial::EEventError | CSerial::EEventRing | CSerial::EEventRLSD | CSerial::EEventRecv); if (lLastError != ERROR_SUCCESS) { //LOG( "Unable to set COM-port event mask" ); } // Use 'non-blocking' reads, because we don't know how many bytes // will be received. This is normally the most convenient mode // (and also the default mode for reading data). lLastError = serial.SetupReadTimeouts(CSerial::EReadTimeoutNonblocking); if (lLastError != ERROR_SUCCESS) { //LOG( "Unable to set COM-port read timeout" ); } // Create a handle for the overlapped operations hevtOverlapped = ::CreateEvent(0,TRUE,FALSE,0);; if (hevtOverlapped == 0) { //LOG( "Unable to create manual-reset event for overlapped I/O" ); } // Setup the overlapped structure ov.hEvent = hevtOverlapped; // Open the "STOP" handle hevtStop = ::CreateEvent(0,TRUE,FALSE,_T("Overlapped_Stop_Event")); if (hevtStop == 0) { //LOG( "Unable to create manual-reset event for stop event" ); } HandleOfThread = CreateThread( NULL, 0, ThreadHandler, 0, 0, NULL); } CPort::~CPort() { //fContinue = false; //CloseHandle( HandleOfThread ); //serial.Close(); } void CPort::Close() { fContinue = false; CloseHandle( HandleOfThread ); serial.Close(); } wchar_t *CPort::GetData() { return data; } bool CPort::getCTS() { return serial.GetCTS(); } bool CPort::getDSR() { return serial.GetDSR(); } bool CPort::getRing() { return serial.GetRing(); } Unreal Script Code: class MyPlayerController extends GamePlayerController DLLBind(SerialPortDLL); dllimport final function Open(string portName); dllimport final function Close(); dllimport final function string GetData();

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• DTracing TCP congestion control

  - by user12820842

  In a previous post, I showed how we can use DTrace to probe TCP receive and send window events. TCP receive and send windows are in effect both about flow-controlling how much data can be received - the receive window reflects how much data the local TCP is prepared to receive, while the send window simply reflects the size of the receive window of the peer TCP. Both then represent flow control as imposed by the receiver. However, consider that without the sender imposing flow control, and a slow link to a peer, TCP will simply fill up it's window with sent segments. Dealing with multiple TCP implementations filling their peer TCP's receive windows in this manner, busy intermediate routers may drop some of these segments, leading to timeout and retransmission, which may again lead to drops. This is termed congestion, and TCP has multiple congestion control strategies. We can see that in this example, we need to have some way of adjusting how much data we send depending on how quickly we receive acknowledgement - if we get ACKs quickly, we can safely send more segments, but if acknowledgements come slowly, we should proceed with more caution. More generally, we need to implement flow control on the send side also. Slow Start and Congestion Avoidance From RFC2581, let's examine the relevant variables: "The congestion window (cwnd) is a sender-side limit on the amount of data the sender can transmit into the network before receiving an acknowledgment (ACK). Another state variable, the slow start threshold (ssthresh), is used to determine whether the slow start or congestion avoidance algorithm is used to control data transmission" Slow start is used to probe the network's ability to handle transmission bursts both when a connection is first created and when retransmission timers fire. The latter case is important, as the fact that we have effectively lost TCP data acts as a motivator for re-probing how much data the network can handle from the sending TCP. The congestion window (cwnd) is initialized to a relatively small value, generally a low multiple of the sending maximum segment size. When slow start kicks in, we will only send that number of bytes before waiting for acknowledgement. When acknowledgements are received, the congestion window is increased in size until cwnd reaches the slow start threshold ssthresh value. For most congestion control algorithms the window increases exponentially under slow start, assuming we receive acknowledgements. We send 1 segment, receive an ACK, increase the cwnd by 1 MSS to 2*MSS, send 2 segments, receive 2 ACKs, increase the cwnd by 2*MSS to 4*MSS, send 4 segments etc. When the congestion window exceeds the slow start threshold, congestion avoidance is used instead of slow start. During congestion avoidance, the congestion window is generally updated by one MSS for each round-trip-time as opposed to each ACK, and so cwnd growth is linear instead of exponential (we may receive multiple ACKs within a single RTT). This continues until congestion is detected. If a retransmit timer fires, congestion is assumed and the ssthresh value is reset. It is reset to a fraction of the number of bytes outstanding (unacknowledged) in the network. At the same time the congestion window is reset to a single max segment size. Thus, we initiate slow start until we start receiving acknowledgements again, at which point we can eventually flip over to congestion avoidance when cwnd ssthresh. Congestion control algorithms differ most in how they handle the other indication of congestion - duplicate ACKs. A duplicate ACK is a strong indication that data has been lost, since they often come from a receiver explicitly asking for a retransmission. In some cases, a duplicate ACK may be generated at the receiver as a result of packets arriving out-of-order, so it is sensible to wait for multiple duplicate ACKs before assuming packet loss rather than out-of-order delivery. This is termed fast retransmit (i.e. retransmit without waiting for the retransmission timer to expire). Note that on Oracle Solaris 11, the congestion control method used can be customized. See here for more details. In general, 3 or more duplicate ACKs indicate packet loss and should trigger fast retransmit . It's best not to revert to slow start in this case, as the fact that the receiver knew it was missing data suggests it has received data with a higher sequence number, so we know traffic is still flowing. Falling back to slow start would be excessive therefore, so fast recovery is used instead. Observing slow start and congestion avoidance The following script counts TCP segments sent when under slow start (cwnd ssthresh). #!/usr/sbin/dtrace -s #pragma D option quiet tcp:::connect-request / start[args[1]-cs_cid] == 0/ { start[args[1]-cs_cid] = 1; } tcp:::send / start[args[1]-cs_cid] == 1 && args[3]-tcps_cwnd tcps_cwnd_ssthresh / { @c["Slow start", args[2]-ip_daddr, args[4]-tcp_dport] = count(); } tcp:::send / start[args[1]-cs_cid] == 1 && args[3]-tcps_cwnd args[3]-tcps_cwnd_ssthresh / { @c["Congestion avoidance", args[2]-ip_daddr, args[4]-tcp_dport] = count(); } As we can see the script only works on connections initiated since it is started (using the start[] associative array with the connection ID as index to set whether it's a new connection (start[cid] = 1). From there we simply differentiate send events where cwnd ssthresh (congestion avoidance). Here's the output taken when I accessed a YouTube video (where rport is 80) and from an FTP session where I put a large file onto a remote system. # dtrace -s tcp_slow_start.d ^C ALGORITHM RADDR RPORT #SEG Slow start 10.153.125.222 20 6 Slow start 138.3.237.7 80 14 Slow start 10.153.125.222 21 18 Congestion avoidance 10.153.125.222 20 1164 We see that in the case of the YouTube video, slow start was exclusively used. Most of the segments we sent in that case were likely ACKs. Compare this case - where 14 segments were sent using slow start - to the FTP case, where only 6 segments were sent before we switched to congestion avoidance for 1164 segments. In the case of the FTP session, the FTP data on port 20 was predominantly sent with congestion avoidance in operation, while the FTP session relied exclusively on slow start. For the default congestion control algorithm - "newreno" - on Solaris 11, slow start will increase the cwnd by 1 MSS for every acknowledgement received, and by 1 MSS for each RTT in congestion avoidance mode. Different pluggable congestion control algorithms operate slightly differently. For example "highspeed" will update the slow start cwnd by the number of bytes ACKed rather than the MSS. And to finish, here's a neat oneliner to visually display the distribution of congestion window values for all TCP connections to a given remote port using a quantization. In this example, only port 80 is in use and we see the majority of cwnd values for that port are in the 4096-8191 range. # dtrace -n 'tcp:::send { @q[args[4]-tcp_dport] = quantize(args[3]-tcps_cwnd); }' dtrace: description 'tcp:::send ' matched 10 probes ^C 80 value ------------- Distribution ------------- count -1 | 0 0 |@@@@@@ 5 1 | 0 2 | 0 4 | 0 8 | 0 16 | 0 32 | 0 64 | 0 128 | 0 256 | 0 512 | 0 1024 | 0 2048 |@@@@@@@@@ 8 4096 |@@@@@@@@@@@@@@@@@@@@@@@@@@ 23 8192 | 0

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• Sorting a Linked List [closed]

  - by Mohit Sehgal

  I want to sort a linked list. Here Node is class representing a node in a Linked List I have written a code to bubble sort a linked list. Program does not finishes execution. Kindly point out the mistakes. class Node { public: int data; public: Node *next; Node() { data=0;next=0; } Node(int d) { data=d; } void setData(int d) { data=d; } void print() { cout<<data<<endl; } bool operator==(Node n) { return this->data==n.data; } bool operator >(Node d) { if((this->data) > (d.data)) return true; return false; } }; class LList { public: int noOfNodes; Node *start;/*Header Node*/ LList() { start=new Node; noOfNodes=0;start=0; } void addAtFront(Node* n) { n->next=(start); start=n; noOfNodes++; } void addAtLast(Node* n) { Node *cur=(start); n->next=NULL; if(start==NULL) { start=n; noOfNodes++; return; } while(cur->next!=NULL) { cur=cur->next; } cur->next=n; noOfNodes++; } void addAtPos(Node *n,int pos) { if(pos==1) { addAtFront(n);return; } Node *cur=(start); Node *prev=NULL; int curPos=0; n->next=NULL; while(cur!=NULL) { curPos++; if(pos==curPos+1) { prev=cur; } if(pos==curPos) { n->next=cur; prev->next=n; break; } cur=cur->next; } noOfNodes++; } void removeFirst() { Node *del=start; start=start->next; delete del; noOfNodes--; return; } void removeLast() { Node *cur=start,*prev=NULL; while(cur->next!=NULL) { prev=cur; cur=cur->next; } prev->next=NULL; Node *del=cur->next; delete del; noOfNodes--; return; } void removeNodeAt(int pos) { if(pos<1) return; if(pos==1) { removeFirst();return;} int curPos=1; Node* cur=start->next; Node* prev=start; Node* del=NULL; while(curPos<pos&&cur!=NULL) { curPos++; if(curPos==pos) { del=cur; prev->next=cur->next; cur->next=NULL; delete del; noOfNodes--; break; } prev=prev->next; cur=cur->next; } } void removeNode(Node *d) { Node *cur=start; if(*d==*cur) { removeFirst();return; } cur=start->next; Node *prev=start,*del=NULL; while(cur!=NULL) { if(*cur==*d) { del=cur; prev->next=cur->next; delete del; noOfNodes--; break; } prev=prev->next; cur=cur->next; } } int getPosition(Node data) { int pos=0; Node *cur=(start); while(cur!=NULL) { pos++; if(*cur==data) { return pos; } cur=cur->next; } return -1;//not found } Node getNode(int pos) { if(pos<1) return -1;// not a valid position else if(pos>noOfNodes) return -1; // not a valid position Node *cur=(start); int curPos=0; while(cur!=NULL) { if(++curPos==pos) return *cur; cur=cur->next; } } void reverseList()//reverse the list { Node* cur=start->next; Node* d=NULL; Node* prev=start; while(cur!=NULL) { d=cur->next; cur->next=start; start=cur; prev->next=d; cur=d; } } void sortBubble() { Node *i=start,*j=start,*prev=NULL,*temp=NULL,*after=NULL; int count=noOfNodes-1;int icount=0; while(i->next!=NULL) { j=start; after=j->next; icount=0; while(++icount!=count) { if((*j)>(*after)) { temp=after->next; after->next=j; prev->next=j->next; j->next=temp; prev=after; after=j->next; } else{ prev=j; j=after; after=after->next; } } i=i->next; count--; } } void traverse() { Node *cur=(start); int c=0; while(cur!=NULL) { // cout<<"start"<<start; c++; cur->print(); cur=cur->next; } noOfNodes=c; } ~LList() { delete start; } }; int main() { int n; cin>>n; int d; LList list; Node *node; Node *temp=new Node(2123); for(int i=0;i<n;i++) { cin>>d; node=new Node(d); list.addAtLast(node); } list.addAtPos(temp,1); cout<<"traverse\n"; list.traverse(); temp=new Node(12); list.removeNode(temp); cout<<"12 removed"; list.traverse(); list.reverseList(); cout<<"\nreversed\n"; list.traverse(); cout<<"bubble sort\n"; list.sortBubble(); list.traverse(); getch(); delete node; return 0; }

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• Mac OS X Server Configure DHCP Options 66 and 67

  - by Paul Adams

  I need to configure Mountain Lion (10.8.2) OS X Server BOOTP to provide DHCP options 66 and 67 to provide PXE booting for PCs on my network. I have tried following the bootpd MAN pages, but they are not specific enough. I have also read conflicting information on the net, but nothing definitive for Mountain Lion DHCP. From bootpd man page: bootpd has a built-in type conversion table for many more options, mostly those specified in RFC 2132, and will try to convert from whatever type the option appears in the property list to the binary, packet format. For example, if bootpd knows that the type of the option is an IP address or list of IP addresses, it converts from the string form of the IP address to the binary, network byte order numeric value. If the type of the option is a numeric value, it converts from string, integer, or boolean, to the proper sized, network byte-order numeric value. Regardless of whether bootpd knows the type of the option or not, you can always specify the DHCP option using the data property list type <key>dhcp_option_128</key> <data> AAqV1Tzo </data> My TFTP server is 172.16.152.20 and the bootfile is pxelinux.0 I have edited /etc/bootpd.plist and added the following to the subnet dict: <key>dhcp_option_66</key> <data> LW4gLWUgrBCYFAo= </data> <key>dhcp_option_67</key> <data> LW4gLWUgcHhlbGludXguMAo= </data> According to the man page, the data elements are supposed to be Base64 encoded, but no matter what I try, I cannot get PXE clients to boot. I have tried encoding 172.16.152.20 using various methods: echo "172.16.152.20" | openssl enc -base64 returns MTcyLjE2LjE1Mi4yMAo= DHCP Option Code Utility (http://mac.softpedia.com/get/Internet-Utilities/DHCP-Option-Code-Utility.shtml) generating a string from 172.16.152.20 yields: LW4gLWUgMTcyLjE2LjE1Mi4yMAo= (used in the above example) DHCP Option Code Utility generating an IP Addresss from 172.16.152.20 yields: LW4gLWUgrBCYFAo= Encoding pxelinux.0 with the above methods likewise yields different encodings. I have tried using all three methods of encoding the data elements, but nothing seems to work i.e. my PXE boot clients do not get directed to my TFTP server. Can anyone help? Regards, Paul Adams.

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• How can I create proportionally-sized pie charts side-by-side in Excel 2007?

  - by Andrew Doran

  I have a pivot table with two sets of data as follows: 2011 2012 Slice A 45 20 Slice B 33 28 Slice C 22 2 I am trying to present two pie charts side-by-side, one with the 2011 data and one with the 2012 data. I want the relative size of each pie chart to reflect the totals, i.e. the pie chart with the 2011 data (totalling 100) should be twice the size of the pie chart with the 2012 data (totalling 50). The 'pie of pie' chart type seems to be closest to what I am looking for but this breaks out data from one slice and presents it in a second diagram so it isn't appropriate here.

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• 500 internal server error on certain page after a few hours

  - by Brian Leach

  I am getting a 500 Internal Server Error on a certain page of my site after a few hours of being up. I restart uWSGI instance with uwsgi --ini /home/metheuser/webapps/ers_portal/ers_portal_uwsgi.ini and it works again for a few hours. The rest of the site seems to be working. When I navigate to my_table, I am directed to the login page. But, I get the 500 error on my table page on login. I followed the instructions here to set up my nginx and uwsgi configs. That is, I have ers_portal_nginx.conf located i my app folder that is symlinked to /etc/nginx/conf.d/. I start my uWSGI "instance" (not sure what exactly to call it) in a Screen instance as mentioned above, with the .ini file located in my app folder My ers_portal_nginx.conf: server { listen 80; server_name www.mydomain.com; location / { try_files $uri @app; } location @app { include uwsgi_params; uwsgi_pass unix:/home/metheuser/webapps/ers_portal/run_web_uwsgi.sock; } } My ers_portal_uwsgi.ini: [uwsgi] #user info uid = metheuser gid = ers_group #application's base folder base = /home/metheuser/webapps/ers_portal #python module to import app = run_web module = %(app) home = %(base)/ers_portal_venv pythonpath = %(base) #socket file's location socket = /home/metheuser/webapps/ers_portal/%n.sock #permissions for the socket file chmod-socket = 666 #uwsgi varible only, does not relate to your flask application callable = app #location of log files logto = /home/metheuser/webapps/ers_portal/logs/%n.log Relevant parts of my views.py data_modification_time = None data = None def reload_data(): global data_modification_time, data, sites, column_names filename = '/home/metheuser/webapps/ers_portal/app/static/' + ec.dd_filename mtime = os.stat(filename).st_mtime if data_modification_time != mtime: data_modification_time = mtime with open(filename) as f: data = pickle.load(f) return data @a bunch of authentication stuff... @app.route('/') @app.route('/index') def index(): return render_template("index.html", title = 'Main',) @app.route('/login', methods = ['GET', 'POST']) def login(): login stuff... @app.route('/my_table') @login_required def my_table(): print 'trying to access data table...' data = reload_data() return render_template("my_table.html", title = "Rundata Viewer", sts = sites, cn = column_names, data = data) # dictionary of data I installed nginx via yum as described here (yesterday) I am using uWSGI installed in my venv via pip I am on CentOS 6 My uwsgi log shows: Wed Jun 11 17:20:01 2014 - uwsgi_response_writev_headers_and_body_do(): Broken pipe [core/writer.c line 287] during GET /whm-server-status (127.0.0.1) IOError: write error [pid: 9586|app: 0|req: 135/135] 127.0.0.1 () {24 vars in 292 bytes} [Wed Jun 11 17:20:01 2014] GET /whm-server-status => generated 0 bytes in 3 msecs (HTTP/1.0 404) 2 headers in 0 bytes (0 switches on core 0) When its working, the print statement in the views "my_table" route prints into the log file. But not once it stops working. Any ideas?

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• heimdal kerberos in openldap issue

  - by Brian

  I think I posted this on the wrong 'sister site', so here it is. I'm having a bit of trouble getting Kerberos (Heimdal version) to work nicely with OpenLDAP. The kerberos database is being stored in LDAP itself. The KDC uses SASL EXTERNAL authentication as root to access the container ou. I created the database in LDAP fine using kadmin -l, but it won't let me use kadmin without the -l flag: root@rds0:~# kadmin -l kadmin> list * krbtgt/REALM kadmin/changepw kadmin/admin changepw/kerberos kadmin/hprop WELLKNOWN/ANONYMOUS WELLKNOWN/org.h5l.fast-cookie@WELLKNOWN:ORG.H5L default brian.empson brian.empson/admin host/rds0.example.net ldap/rds0.example.net host/localhost kadmin> exit root@rds0:~# kadmin kadmin> list * brian.empson/admin@REALM's Password: <----- With right password kadmin: kadm5_get_principals: Key table entry not found kadmin> list * brian.empson/admin@REALM's Password: <------ With wrong password kadmin: kadm5_get_principals: Already tried ENC-TS-info, looping kadmin> I can get tickets without a problem: root@rds0:~# klist Credentials cache: FILE:/tmp/krb5cc_0 Principal: brian.empson@REALM Issued Expires Principal Nov 11 14:14:40 2012 Nov 12 00:14:37 2012 krbtgt/REALM@REALM Nov 11 14:40:35 2012 Nov 12 00:14:37 2012 ldap/rds0.example.net@REALM But I can't seem to change my own password without kadmin -l: root@rds0:~# kpasswd brian.empson@REALM's Password: <---- Right password New password: Verify password - New password: Auth error : Authentication failed root@rds0:~# kpasswd brian.empson@REALM's Password: <---- Wrong password kpasswd: krb5_get_init_creds: Already tried ENC-TS-info, looping kadmin's logs are not helpful at all: 2012-11-11T13:48:33 krb5_recvauth: Key table entry not found 2012-11-11T13:51:18 krb5_recvauth: Key table entry not found 2012-11-11T13:53:02 krb5_recvauth: Key table entry not found 2012-11-11T14:16:34 krb5_recvauth: Key table entry not found 2012-11-11T14:20:24 krb5_recvauth: Key table entry not found 2012-11-11T14:20:44 krb5_recvauth: Key table entry not found 2012-11-11T14:21:29 krb5_recvauth: Key table entry not found 2012-11-11T14:21:46 krb5_recvauth: Key table entry not found 2012-11-11T14:23:09 krb5_recvauth: Key table entry not found 2012-11-11T14:45:39 krb5_recvauth: Key table entry not found The KDC reports that both accounts succeed in authenticating: 2012-11-11T14:48:03 AS-REQ brian.empson@REALM from IPv4:192.168.72.10 for kadmin/changepw@REALM 2012-11-11T14:48:03 Client sent patypes: REQ-ENC-PA-REP 2012-11-11T14:48:03 Looking for PK-INIT(ietf) pa-data -- brian.empson@REALM 2012-11-11T14:48:03 Looking for PK-INIT(win2k) pa-data -- brian.empson@REALM 2012-11-11T14:48:03 Looking for ENC-TS pa-data -- brian.empson@REALM 2012-11-11T14:48:03 Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ 2012-11-11T14:48:03 sending 294 bytes to IPv4:192.168.72.10 2012-11-11T14:48:03 AS-REQ brian.empson@REALM from IPv4:192.168.72.10 for kadmin/changepw@REALM 2012-11-11T14:48:03 Client sent patypes: ENC-TS, REQ-ENC-PA-REP 2012-11-11T14:48:03 Looking for PK-INIT(ietf) pa-data -- brian.empson@REALM 2012-11-11T14:48:03 Looking for PK-INIT(win2k) pa-data -- brian.empson@REALM 2012-11-11T14:48:03 Looking for ENC-TS pa-data -- brian.empson@REALM 2012-11-11T14:48:03 ENC-TS Pre-authentication succeeded -- brian.empson@REALM using aes256-cts-hmac-sha1-96 2012-11-11T14:48:03 ENC-TS pre-authentication succeeded -- brian.empson@REALM 2012-11-11T14:48:03 AS-REQ authtime: 2012-11-11T14:48:03 starttime: unset endtime: 2012-11-11T14:53:00 renew till: unset 2012-11-11T14:48:03 Client supported enctypes: aes256-cts-hmac-sha1-96, aes128-cts-hmac-sha1-96, des3-cbc-sha1, arcfour-hmac-md5, using aes256-cts-hmac-sha1-96/aes256-cts-hmac-sha1-96 2012-11-11T14:48:03 sending 704 bytes to IPv4:192.168.72.10 2012-11-11T14:45:39 AS-REQ brian.empson/admin@REALM from IPv4:192.168.72.10 for kadmin/admin@REALM 2012-11-11T14:45:39 Client sent patypes: REQ-ENC-PA-REP 2012-11-11T14:45:39 Looking for PK-INIT(ietf) pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 Looking for PK-INIT(win2k) pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 Looking for ENC-TS pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ 2012-11-11T14:45:39 sending 303 bytes to IPv4:192.168.72.10 2012-11-11T14:45:39 AS-REQ brian.empson/admin@REALM from IPv4:192.168.72.10 for kadmin/admin@REALM 2012-11-11T14:45:39 Client sent patypes: ENC-TS, REQ-ENC-PA-REP 2012-11-11T14:45:39 Looking for PK-INIT(ietf) pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 Looking for PK-INIT(win2k) pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 Looking for ENC-TS pa-data -- brian.empson/admin@REALM 2012-11-11T14:45:39 ENC-TS Pre-authentication succeeded -- brian.empson/admin@REALM using aes256-cts-hmac-sha1-96 2012-11-11T14:45:39 ENC-TS pre-authentication succeeded -- brian.empson/admin@REALM 2012-11-11T14:45:39 AS-REQ authtime: 2012-11-11T14:45:39 starttime: unset endtime: 2012-11-11T15:45:39 renew till: unset 2012-11-11T14:45:39 Client supported enctypes: aes256-cts-hmac-sha1-96, aes128-cts-hmac-sha1-96, des3-cbc-sha1, arcfour-hmac-md5, using aes256-cts-hmac-sha1-96/aes256-cts-hmac-sha1-96 2012-11-11T14:45:39 sending 717 bytes to IPv4:192.168.72.10 I wish I had more detailed logging messages, running kadmind in debug mode seems to almost work but it just kicks me back to the shell when I type in the correct password. GSSAPI via LDAP doesn't work either, but I suspect it's because some parts of kerberos aren't working either: root@rds0:~# ldapsearch -Y GSSAPI -H ldaps:/// -b "o=mybase" o=mybase SASL/GSSAPI authentication started ldap_sasl_interactive_bind_s: Other (e.g., implementation specific) error (80) additional info: SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information () root@rds0:~# ldapsearch -Y EXTERNAL -H ldapi:/// -b "o=mybase" o=mybase SASL/EXTERNAL authentication started SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth SASL SSF: 0 # extended LDIF <snip> Would anyone be able to point me in the right direction?

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• CIFS(Samba) + ACL = not working

  - by tst

  I have two servers with Debian 5.0. server1: samba 2:3.2.5-4lenny9 smbfs 2:3.2.5-4lenny9 smb.conf: [test] comment = test path = /var/www/_test/ browseable = no only guest = yes writable = yes printable = no create mask = 0644 directory mask = 0755 server1:~# mount | grep sda3 /dev/sda3 on /var/www type ext3 (rw,acl,user_xattr) # getfacl /var/www/_test/ # file: var/www/_test/ # owner: www-data # group: www-data user::rwx group::rwx other::r-x default:user::rwx default:user:www-data:rw- default:user:testuser:rw- default:group::rwx default:mask::rwx default:other::r-x server2: samba-common 2:3.2.5-4lenny9 smbfs 2:3.2.5-4lenny9 server2:~# mount.cifs //server1/test /media/smb/test -o rw,user_xattr,acl server2:~# mount | grep test //server1/test on /media/smb/test type cifs (rw,mand) server2:~# getfacl /media/smb/test/ # file: media/smb/test/ # owner: www-data # group: www-data user::rwx group::rwx other::r-x default:user::rwx default:user:www-data:rw- default:user:testuser:rw- default:group::rwx default:mask::rwx default:other::r-x And there is the problem: server2:~# su - testuser (reverse-i-search)`touch': touch 123 testuser@server2:~$ touch /media/smb/ testuser@server2:~$ touch /media/smb/test/123 touch: cannot touch `/media/smb/test/123': Permission denied Whats wrong?!

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• Why is a ZFS pool not persisting over server restart?

  - by Chance

  I have a ZFS pool with 4 drives. It also has a 3gb ZIL and a 20GB L2ARC that are each partitions on an SDD that doubles as my Linux Mint (ver. 13) boot drive. The pool is mounted to /data. The problem I am running into is that when I restart the server the pool/directory is completely wiped despite having data in it prior. I'm afraid I'm doing something wrong in the setup, which leads me to the following questions: What would cause this? Is there anyway to get the data back? How do I stop it from happening in the future? Thank you in advance! pool: data state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM data ONLINE 0 0 0 raidz2-0 ONLINE 0 0 0 sda1 ONLINE 0 0 0 sdb1 ONLINE 0 0 0 sdc1 ONLINE 0 0 0 sdd1 ONLINE 0 0 0 logs sde4 ONLINE 0 0 0 cache sde3 ONLINE 0 0 0 errors: No known data errors

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• NFS Client reports Permission Denied, Server reports Permission Granted

  - by VxJasonxV

  I have two RedHat 4 Servers. The client is 4.6, the server is 4.5. I'm attempting to mount a share from the server, onto the client via NFS. The /etc/exports configuration is as follows: /opt/data/config bkup(rw,no_root_squash,async) /opt/data/db bkup(rw,no_root_squash,async) exportfs returns these (among other) shares, nfs is running according to ps output. I've been attempting to use autofs on the client, but have opted to just mount the share manually considering the issues I'm having. So, I issue the mount request: mount dist:/opt/data/config /mnt/config mount: dist:/opt/data/config failed, reason given by server: Permission denied Ok, so let's see what the server has to say for itself. May 6 23:17:55 dist mountd[3782]: authenticated mount request from bkup:662 for /opt/data/config (/opt/data/config) It says it allowed the mount to take place. How can I diagnose why the client and server are disagreeing on the result?

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• Accessing through VPN, which internet connection would be used

  - by Sriram

  I've a data card which has a limit of 2 GB up/download traffic per month. I've an office internet line which has an unlimited up/download. I've successfully connected to VPN using my data card and by changing certain configurations like DNS etc., have also been able to use my office line for internet (verified by doing a IP check - returns the static IP of our office). Now to my question - is it just a NAT which is happening or am I actually using my office line for all communication. Which one would reflect the usage/trace. The data card usage log at this moment does not reflect any usage (which is confusing since the VPN is over the data card connection). Further more (theoretically), would the net be any faster if my office line is let us say 8Mbps and the data card is 512kbps by doing this as against directly connecting the internet using the data card.

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• Concatenate cells that change daily automatically?

  - by Harold

  I use concatenate to pull data together from different cells in my spreadsheet. Since my data changes daily, I want the formula to also change daily without having to manually input the new cell in the concatenate formula. I am looking for a way to do this but not sure how. Can anyone out there help me out please!? I appreciate the assistance in advance! Maybe this will help to explain what I need. I have a row of data from D4:AH4 that I insert daily based on the new day. When I use the concatenate and us the following formula: =CONCATENATE(TEXT('Raw Data'!B4,"m/d")," ",TEXT('Raw Data'!C4,"")," ", TEXT('Raw Data'!E4,"0.0%"))... E4 being the cell that changes daily where next day would be F4, G4, etc... All other parts of the formula will stay the same. I hope this helps! Thanks! :)

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• Linux software raid robustness for raid1 vs other raid levels

  - by Waxhead

  I have a raid5 running and now also a raid1 that I set up yesterday. Since raid5 calculates parity it should be able to catch silent data corruption on one disk. However for raid1 the disks are just mirrors. The more I think about it I figure that raid1 is actually quite risky. Sure it will save me from a disk failure but i might not be as good when it comes to protecting the data on disk (who is actually more important for me). How does Linux software raid actually store raid1 type data on disk? How does it know what spindle is giving corrupt data (if the disk(subsystem) is not reporting any errors) If raid1 really is not giving me data protection but rather disk protection is there some tricks I can do with mdadm to create a two disk "raid5 like" setup? e.g. loose capacity but still keep redundancy also for data!?

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• rename/delete a folder from multipart rar file

  - by kikio

  Hello. I've a question: (I sent it in past) I have multipart rar file. Their contents are: file.part01.rar: myfolder (is a folder) data.cab -- file.part02.rar: myfolder (is a folder) data.cab <- file.part03.rar: myfolder (is a folder) data.cab <- file.part04.rar: difffolder (is a folder) anfolder (is a folder) data.cab <- file.part05.rar: myfolder (is a folder) data.cab <-- I want to extract it, so I right-click on "file.part01.rar" and select "Extract to ...". It extract 3 files, but in part 4, WinRAR said: "CRC. This file is currput." I think it problem is in the folders name in part04.rar. Is there anyway to rename folders in part04.rar? and cut "data.cab" from "afolder" to "difffolder". I really need it!! it is very emergency!!!!!!!! Thank you .....

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• Good set of web hosting permissions?

  - by Jorge Israel Peña

  Hey guys, I just got a linode and I'm in the process of configuring it. It's running nginx with php-fpm and passenger. nginx was compiled and is running as user nginx. php-fpm (php with fastcgi process manager) is running as www-data (in group www-data). My sites are currently in /var/www, so for example /var/www/test.com I'm just wondering what the general 'flow' of things is. So for example, /var/www is owned by root, should I chown of /var/www/test.com to nginx or www-data? Or should I put nginx in the www-data group? How should site uploading work, I just transfer files to the /var/www/test.com directory as root (sudo) and then chown -R www-data:www-data .? Thanks. I'm capable of figuring things out on my own, I'm just wondering what the typical/general way of handling users/groups/permissions/site-files is on linux with a webserver.

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• Is there still a place for tape storage?

  - by Jon Ericson

  We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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• How to have 2 windows machines on the same network with the same IP address

  - by Stu

  I have a custom made ADC device that is spitting out data by addressed UDP packets. I have that device plugged into a 4 port switch. I have one windows embedded standard 7 machine which is the normal recipient of that data. To be able to receive the data (Using LabVIEW) the windows network adapter IPv4 settings must have a static IP address that corresponds to the UDP packet destination. I would like to add a second windows machine (This one is just regular Win 7 Pro) to simultaneously catch the data, however with all devices connected to the switch, the Win 7 Pro machine recognizes an IP address conflict and will not take the setting for the required static IP address. (The network adaptor settings show that the correct value has been entered but ipconfig shows that it is not actually set.) Neither windows machine needs to transmit network data, they only need to be able to receive the UDP data from the ADC device. Is there any way to disable this IP address conflict detection 'feature' of windows networking?

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• Needing to concatenate between cells that change daily. I want to be able to automate this vs manual

  - by Harold

  I use concatenate to pull data together from different cells in my spreadsheet. Since my data changes daily, I want the formula to also change daily without having to manually input the new cell in the concatenate formula. I am looking for a way to do this but not sure how. Can anyone out there help me out please!? I appreciate the assistance in advance! Maybe this will help to explain what I need. I have a row of data from D4:AH4 that I insert daily based on the new day. When I use the concatenate and us the following formula: =CONCATENATE(TEXT('Raw Data'!B4,"m/d")," ",TEXT('Raw Data'!C4,"")," ",TEXT('Raw Data'!E4,"0.0%"))... E4 being the cell that changes daily where next day would be F4, G4, etc... All other parts of the formula will stay the same. I hope this helps! Thanks! :)

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• Can't read directory owned by my group

  - by Jonathan

  I moved the postgres data directory to a separate partition and it works great. The directory is owned by postgres user and postgres group. d-wx------ 11 postgres postgres 4.0K 2010-06-11 08:28 data/ I added myself to the group > sudo addgroup me postgres > groups me me : me adm dialout cdrom plugdev lpadmin admin sambashare postgres And gave the group read and execute permissions to everything in the directory. sudo chmod -R g+rx ./data d-wxr-x--- 11 postgres postgres 4.0K 2010-06-11 08:28 data/ But I still can not CD or LS the directory. > ls data ls: cannot open directory data: Permission denied What beginner mistake am I making?

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• Copy only remaining rows after filter to new Excel Workbook

  - by Joel Coehoorn

  I have an Excel file with an external data connection set up. It pulls data in directly from a database, and gives us about 450 rows. The header row allows us to filter the data in the sheet, and we use this as a general purpose tool... I will use the filters to narrow down what I'm looking at based on criteria that change depending on the circumstance. Often, after filtering the data, I want to send just the filtered records to another person. I'd like to copy/paste just the remaining rows into a new Workbook to send via e-mail. Unfortunately, this doesn't work. When I paste the data, it still pastes all the data. The filtered rows are still in the workbook... they're just hidden. I want them gone from the new file completely. How can I do this?

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• Less daunting front end for SQL Server

  - by Martin

  We currently have a few users who have been using Access very succesfully to throw around large amounts of data. We've now got to the point where the data is just too large to be held in Access, as well as wanting to hold it in a single place where multiple users can access it. We have therefore moved the data over to SQL Server. I want to provide a general tool that they can use to view the data on the server and do some simple things like run queries and filters and export the data for offline manipulation. I don't want the support headaches that might come with rolling out SQL Management Studio, and neither do I want to have to create an Access database with links for each current database or ones that are created in the future. Can anyone recommend a simple tool that will connect to a server, list all the databases and allow a user to drill into a table and look at the data. Many thanks.

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• How to make a dropdown list such that... (see details)

  - by daysandtimes

  I want to plot the stock prices of certain companies VS the S&P500. I have all the price data downloaded in my excel sheet already. I want to create a line graph in Excel. One line is fixed and that would be the S&P500, and the other would be the company I select. I know how to use data validation to create a dropdown list, but how could I make it in such a way that when I select company A, I would only see company A's price data but not company B, C, etc. Then when I select company B, I would only see company B's price data & the S&P price data. And so on. The S&P line will be visible all the time, but the various company's price line will only appear if it is selected. Is there any easy way to normalize all sets of data in a way such that the starting point is always 100?

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• How can I keep persistent cookies from certain domains only?

  - by Mike L.

  This question is similar this one which covers Firefox, but I want to know how to do it in Chrome: I want Chrome to clear cookies from all sites accept those from certain domains. In the Cookies section of the *Content Settings I've made following selections: (*) Allow local data to be set (recommended) ( ) Allow local data to be set for the current session only ( ) Block sites from setting any data [ ] Block third-party cookies and site data [x] Clear cookies and other sites and plug-in data when I close my browser After logged in to my preferred website(s), I find the required domains listed when I click at All cookies and site data. Let's say, I find some cookies for mysite.comand www.mysite.com. Now I click at Manage exceptions and enter these items: Hostname Pattern Behavior ------------------------------------------- mysite.com Allow www.mysite.com Allow Unfortunately, this does not seem to work, because when I close Chrome and reopen it, all cookies are gone, even those from the configured mysite.com hosts.

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• C# powershell output reader iterator getting modified when pipeline closed and disposed.

  - by scope-creep

  Hello, I'm calling a powershell script from C#. The script is pretty small and is "gps;$host.SetShouldExit(9)", which list process, and then send back an exit code to be captured by the PSHost object. The problem I have is when the pipeline has been stopped and disposed, the output reader PSHost collection still seems to be written to, and is filling up. So when I try and copy it to my own output object, it craps out with a OutOfMemoryException when I try to iterate over it. Sometimes it will except with a Collection was modified message. Here is the code. private void ProcessAndExecuteBlock(ScriptBlock Block) { Collection<PSObject> PSCollection = new Collection<PSObject>(); Collection<Object> PSErrorCollection = new Collection<Object>(); Boolean Error = false; int ExitCode=0; //Send for exection. ExecuteScript(Block.Script); // Process the waithandles. while (PExecutor.PLine.PipelineStateInfo.State == PipelineState.Running) { // Wait for either error or data waithandle. switch (WaitHandle.WaitAny(PExecutor.Hand)) { // Data case 0: Collection<PSObject> data = PExecutor.PLine.Output.NonBlockingRead(); if (data.Count > 0) { for (int cnt = 0; cnt <= (data.Count-1); cnt++) { PSCollection.Add(data[cnt]); } } // Check to see if the pipeline has been closed. if (PExecutor.PLine.Output.EndOfPipeline) { // Bring back the exit code. ExitCode = RHost.ExitCode; } break; case 1: Collection<object> Errordata = PExecutor.PLine.Error.NonBlockingRead(); if (Errordata.Count > 0) { Error = true; for (int count = 0; count <= (Errordata.Count - 1); count++) { PSErrorCollection.Add(Errordata[count]); } } break; } } PExecutor.Stop(); // Create the Execution Return block ExecutionResults ER = new ExecutionResults(Block.RuleGuid,Block.SubRuleGuid, Block.MessageIdentfier); ER.ExitCode = ExitCode; // Add in the data results. lock (ReadSync) { if (PSCollection.Count > 0) { ER.DataAdd(PSCollection); } } // Add in the error data if any. if (Error) { if (PSErrorCollection.Count > 0) { ER.ErrorAdd(PSErrorCollection); } else { ER.InError = true; } } // We have finished, so enque the block back. EnQueueOutput(ER); } and this is the PipelineExecutor class which setups the pipeline for execution. public class PipelineExecutor { private Pipeline pipeline; private WaitHandle[] Handles; public Pipeline PLine { get { return pipeline; } } public WaitHandle[] Hand { get { return Handles; } } public PipelineExecutor(Runspace runSpace, string command) { pipeline = runSpace.CreatePipeline(command); Handles = new WaitHandle[2]; Handles[0] = pipeline.Output.WaitHandle; Handles[1] = pipeline.Error.WaitHandle; } public void Start() { if (pipeline.PipelineStateInfo.State == PipelineState.NotStarted) { pipeline.Input.Close(); pipeline.InvokeAsync(); } } public void Stop() { pipeline.StopAsync(); } } An this is the DataAdd method, where the exception arises. public void DataAdd(Collection<PSObject> Data) { foreach (PSObject Ps in Data) { Data.Add(Ps); } } I put a for loop around the Data.Add, and the Collection filled up with 600k+ so feels like the gps command is still running, but why. Any ideas. Thanks in advance.

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