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  • php cron jobs overlapping

    - by naveen gupta
    Hi I wrote few months back a script in perl for checking overlapping of jobs use Fcntl ':flock'; INIT { my $waitcount=12; # possible attemtps to run script my $waitseconds=300; # wait for $waitseconds each attempt my $lockstatus=0;#no lock was attained while ($waitcount > 0){ if (open LH, $0){ while ($waitcount > 0){ if (flock LH, LOCK_EX|LOCK_NB){ $waitcount=0;#signal end of waiting $lockstatus=1;#lock was attained } else{ --$waitcount;#decrement waitcount print "waiting to be able to lock $0\n"; sleep $waitseconds; }#end else }#end while }#end if else{ --$waitcount;#decrement waitcount print "waiting to be able to open $0\n"; sleep $waitseconds; }#end else }#end while if ($lockstatus == 0){ die "no lock was attained\n"; }#end if } I wanted to know if we can do similar thing in php .. How to integrate with your current php code which is running a part of php jobs?

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  • Error using iif in ms access query

    - by naveen
    I am trying to fire this query in MS Access SELECT file_number, IIF(invoice_type='Spent on Coding',SUM(CINT(invoice_amount)), 0) as CodingExpense FROM invoice GROUP BY file_number I am getting this error Error in list of function arguments: '=' not recognized. Unable to parse query text. I tried replacing IIF with SWITCH to no avail. What's wrong with my query and how to correct this?

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  • Flash+PHP+cookie

    - by naveen
    I want an animation play only once in the browser. If any user seen the movie and if goes to any other page or refresh(F5) and then come back on the animation page then animation should not play from start. I want to play it from another frame. I think it can be done by set cookie or somthing using javascript or php. Please anybody help me. Thanks in advance. I will appreciate ,if some code help please

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  • Is 'bool' a basic datatype in C++ ?

    - by Naveen
    I got this doubt while writing some code. Is 'bool' a basic datatype defined in the C++ standard or is it some sort of extension provided by the compiler ? I got this doubt because Win32 has 'BOOL' which is nothing but a typedef of long. Also what happens if I do something like this: int i = true; Is it "always" guaranteed that variable i will have value 1 or is it again depends on the compiler I am using ? Further for some Win32 APIs which accept BOOL as the parameter what happens if I pass bool variable?

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  • Does the compiler optimize the function parameters passed by value?

    - by Naveen
    Lets say I have a function where the parameter is passed by value instead of const-reference. Further, lets assume that only the value is used inside the function i.e. the function doesn't try to modify it. In that case will the compiler will be able to figure out that it can pass the value by const-reference (for performance reasons) and generate the code accordingly? Is there any compiler which does that?

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  • Java scripts conflict on my home page

    - by naveen
    <script type="text/javascript" src="jquery-1.js"></script> <script type="text/javascript" src="mootools.js"></script> <script type="text/javascript" src="slideshow.js"></script> <script type="text/javascript"> //<![CDATA[ window.addEvent('domready', function(){ var data = { '1.jpg': { caption: 'Volcano Asención in Ometepe, Nicaragua.' }, '2.jpg': { caption: 'A Ceibu tree.' }, '3.jpg': { caption: 'The view from Volcano Maderas.' }, '4.jpg': { caption: 'Beer and ice cream.' } }; var myShow = new Slideshow('show', data, {controller: true, height: 400, hu: 'images/', thumbnails: true, width: 500}); }); //]]> </script> <script type="text/javascript"> $(document).ready(function() { //slides the element with class "menu_body" when paragraph with class "menu_head" is clicked $("#firstpane p.menu_head").click(function() { $(this).css({backgroundImage:"url(down.png)"}).next("div.menu_body").slideToggle(300).siblings("div.menu_body").slideUp("slow"); $(this).siblings().css({backgroundImage:"url(left.png)"}); }); //slides the element with class "menu_body" when mouse is over the paragraph $("#secondpane p.menu_head").mouseover(function() { $(this).css({backgroundImage:"url(down.png)"}).next("div.menu_body").slideDown(500).siblings("div.menu_body").slideUp("slow"); $(this).siblings().css({backgroundImage:"url(left.png)"}); }); }); </script> <!--[if lt IE 7]> <script type="text/javascript" src="unitpngfix.js"></script> <![endif]-->

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  • log file not generated while accessing a jar having log4j support.

    - by naveen garimella
    I have a x.jar which is being used by some client y.jar. Both x.jar and y.jar are at the same package level. i have put the log4j.xml at the same package level. But the log file is never generated. Can i know why? I have tried few other options as well but no luck till now. i have added log4j-1.2.16.jar to ClassPath: variable in manifest files of both x.jar and y.jar. Put log4j.xml at the class level of y.jar which actually calls the x.jar classes. package structure is as follows: x.jar --manifest.mf has a entry ClassPath:log4j-1.2.16.jar y.jar --manifest.mf has a entry ClassPath:log4j-1.2.16.jar log4j-1.2.16.jar log4j.xml --has a RollingFileAppender. Can any one suggest whether i am missing anything?

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  • download iphone sample code from apple

    - by Naveen
    the iphone sdk documentation has links to sample code, but you have to download them individually from the web. Is there a bundle you can download all at once from apple ? For example, reading the first iphone tutorial at switchonthecode, the first new word I came across was UIApplication. There are 5 samples on the web...

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  • Is new int[10]() valid c++?

    - by Naveen
    While trying to answer this question I found that the code int* p = new int[10](); compiles fine with VC9 compiler and initializes the integers to 0. So my questions are: First of all is this valid C++ or is it a microsoft extension? Is it guaranteed to initialize all the elements of the array? Also, is there any difference if I do new int; or new int();? Does the latter guarantee to initialize the variable?

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  • Date difference in SQL Server 2005

    - by naveen
    Hi, I have two dates of the form Start Date: 2007-03-24, End Date: 2009-06-26 Now I need to find the difference between these two in the below form: 2 years, 3 months and 2 days Can someone please … in SQL Server 2005

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  • grails services :: multiple projects

    - by naveen
    PROBLEM : I have multiple grails projects (lets say appA, appB and appC) : services to be precise I want to run them in a single grails-app.. probably a war deployment, how can i do this? REQUIREMENTS : I want this to be a single app since i am deploying it on cloud and i don't have enough memory to hold all these service instances individually. The reason for multiple grails project is scalability. So that if later on i want to run 10 instance of appA, 3 instance of appB, and 1 instance of aapC; i should be able to do that. EDIT : Can i use something like 0mq, will that be helpful in keeping the services separated from each other. How will i package my service? And reading the docs of 0mq seems that it can work with both inprocess and external process. Will async grails requests on HTTP work with 0mq in process/ external mq calls. Haven't used 0mq, but from the initial doc it seems to work. Need some experience calls in this scenario. Are there any other alternatives or mq alternatives?

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  • Java-Counting occurrence of word from huge textfile

    - by Naveen
    I have a text file of size 115MB. It consists of about 20 million words. I have to use the file as a word collection, and use it to search the occurrence of each user-given words from the collection. I am using this process as a small part in my project. I need a method for finding out the number of occurrence of given words in a faster and correct manner since i may use it in iterations. I am in need of suggestion about any API that i can make use or some other way that performs the task in a quicker manner. Any recommendations are appreciated.

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  • DNS lookup failed --- dig: couldn't get address for 'ns1.p34.dynect.net': failure

    - by Udit Gupta
    I am a Network Admin from India, managing a large University Network of more than 15000 users. Here goes my problem - My DNS is unable to get ip address for ns1.p34.dynect.net. when i use dig +trace twitter.com on my DNS Server i get this messages:- dig: couldn't get address for 'ns1.p34.dynect.net': failure and this is happening with all those sites listed with dynect.net like twitter,linkedin,quora etc. Find the attached screen shot for the same message. Right now I have temporally fixed (not actually fixed) the problem using Google DNS (8.8.8.8) What could be the issue as It is able to resolve all other sites perfectlly. Thanks Edit: As suggested in answer, I am attaching one more screen shot.

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  • HTTP response time profiling

    - by Sparsh Gupta
    Hello I have a nginx reverse proxy. The server is close to serving 600-700 requests per second. I have a Munin HTTP load time plugin which is outputting this: http://monitor.wingify.com/munin/visualwebsiteoptimizer.com/lb1.visualwebsiteoptimizer.com-http_loadtime.html Now, the problem is I am seeing some spikes in the graph. Expected response times should always be under 200ms. I am keeping an eye on syslog and messages but I am unable to figure out the actual cause of this. I was wondering if there is any good HTTP response time profiling system which I can install / embed with this nginx server and get a detailed reports / logs on the breakup of time taken by different things and what exactly is the cause of the spikes. The profiling system would also help me understand bottlenecks and how can I further optimize the latency. Most important right now is to investigate the cause of the spikes in the HTTP load time graphs (similar pattern is reported by external monitors - Pingdom) and to fix it to get consistent response times Thanks

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  • Restarting Haproxy Gracefully

    - by Anand Gupta
    As per various blogs, HAproxy can be gracefully restarted using the following command: sudo haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -sf $(cat /var/run/haproxy.pid) TO verify this, I had set up a apache bench script which contiguously sent message to haproxy. Ideally, whenever I restarted my server the script should not have an affect on the apache bunch execiton. But, it seems that whenever Haproxy is restarted apache bench scripts terminate and the connection to load balancer is lost. Here is the details of my HaProxy configuration file : global nbproc 4 log 127.0.0.1 local0 log 127.0.0.1 local1 notice #log loghost local0 info maxconn 4096 #chroot /usr/share/haproxy user haproxy group haproxy daemon pidfile /var/run/haproxy.pid stats socket /home/ubuntu/haproxy.sock #debug #quiet defaults log global mode http option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 listen webstats bind 0.0.0.0:1000 stats enable mode http stats uri /lb?stats stats auth anand:aaaaaaaa #stats refresh listen web-farm 0.0.0.0:80 mode http balance roundrobin option httpchk HEAD /index.php HTTP/1.0 server server2.com 1.1.1.1:80 server serve1.com 1.1.1.2:80 ~ Please let me know what am I missing here.

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  • possible SYN flooding on port 80. Sending cookies

    - by Sparsh Gupta
    I recently had a server downtime. I looked everywhere and the only thing I found in my log files is: Feb 17 18:58:04 localhost kernel: possible SYN flooding on port 80. Sending cookies. Feb 17 18:59:33 localhost kernel: possible SYN flooding on port 80. Sending cookies. Can someone give me more information about it. WHat is it, How can I debug the cause and how can I fix the same. I also posted ipconntrack suddenly became toooo large which has another data point I found unusual, wondering if the two things is connected as they occured exactly at the same time but at different servers. One at reverse proxy and other at actual backend Varnish server) Thanks

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  • Uknown nginx Error Messages

    - by Sparsh Gupta
    Hello, I am getting some nginx errors as I can see them in my error.log which I am unable to understand. They look like: ERRORS: 2011/03/13 21:48:21 [crit] 14555#0: *323314343 open() "/usr/local/nginx/proxy_temp/0/95/0000000950" failed (13: Permission denied) while reading upstream, client: XX.XX.XX.XX, server: , request: "GET /abc.jpg 2 HTTP/1.0", upstream: "http://192.168.162.141:80/abc.jpg", host: "example.com", referrer: "http://domain.com" 2011/03/13 22:00:07 [crit] 14552#0: *324171134 open() "/usr/local/nginx/proxy_temp/1/95/0000000951" failed (13: Permission denied) while reading upstream, client: XX.XX.XX.XY, server: , request: "GET mno.png HTTP/1.1", upstream: "http://192.168.162.141:80/mno.png", host: "example.com", referrer: "http://domain2.com" I also looked at these locations but found that there is no file by this name. root@li235-57:/var/log/nginx# /usr/local/nginx/proxy_temp/1/ 00/ 01/ 02/ 03/ 04/ 05/ 06/ 07/ 08/ 09/ 10/ 11/ 12/ 13/ 14/ 15/ 16/ 17/ 18/ 19/ 20/ 21/ 22/ 23/ 24/ 25/ 26/ 27/ 28/ 29/ 30/ 31/ 32/ 33/ 34/ 35/ 36/ 37/ root@li235-57:/var/log/nginx# ls /usr/local/nginx/proxy_temp/0/ 01/ 02/ 03/ 04/ 05/ 06/ 07/ 08/ 09/ 10/ 11/ 12/ 13/ 14/ 15/ 16/ 17/ 18/ 19/ 20/ 21/ 22/ 23/ 24/ 25/ 26/ 27/ 28/ 29/ 30/ 31/ 32/ 33/ 34/ 35/ 36/ 37/ Can someone help me whats going on / how can I debug this more and better fix this Thanks

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  • Upgrade MySQL on Plesk on Windows

    - by Cyril Gupta
    I just got a nasty surprise when I installed a website in Unicode Hindi (Indian language) on a server, all freshly entered unicode data is turning into question marks on the server. On my dev machine it works perfectly. I found that I have MySQL version 5.0.45 (installed in default by Plesk I guess). On my dev machine i have version 5.1.33. I believe the problem could be due to the version difference. The new version of MySQL apparently has better support for Unicode than the older one. I want to upgrade MySQL on my Windows Server machine with Plesk installed on it I am reluctant to just install the new version using the mysql installer because Plesk maintains some custom settings for mysql and I am afraid the new version could change those settings and break my db. Can anyone tell me do I have to do anything special to install MySQL on plesk on windows or can I just use the new version installer?

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  • Server Configuration / Important Parameter for 500Req/Second

    - by Sparsh Gupta
    I am configuring a server to be used as nginx server for a very heavy traffic website. It is expected to receive traffic from a large number of IP addresses simultaneously. It is expected to get 500Req/Second with atleast 20Million unique IPs connecting it. One of the problems I noticed in my previos server was related to iptables / ipconntrack. I am not aware of this behaviour and would be glad to know which all parameters of a ubuntu / debian (32/64) bit machine should I tweek to get maximum performance from the server. I can put in a lot of RAM on the server but mission critical task is the response times. We ideally dont want any connection to be hanging / timing out / waiting and want as low as possible overall response times. P.S. We are also looking for a kick ass freelancer system admin who can help us figuring / setting this all up. Reach me incase you have some spare time and interested in working on some very heavy traffic website servers.

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  • DHCP request error. Send_packet now permitted, How to debug, What does it mean

    - by Sparsh Gupta
    Hello I recently installed CSF firewall and have made live a new server which is accepting around 600req/second. Its basically a reverse proxy and I found in pingdom and munin that for a particular time, the response times of the server increased by 3 folds. I looked into logs and exactly at that point, I found loads of entries like this: Feb 27 15:22:09 li235-57 dhclient: DHCPREQUEST of <My IP address> on eth0 to 207.192.68.72 port 67 Feb 27 15:22:09 li235-57 dhclient: send_packet: Operation not permitted Can you help me understand what went wrong and what exactly happened. Is there any settings I should change in CSF or any pointer to debug this further Thanks

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  • Upgrade MySQL on Plesk on Windows

    - by Cyril Gupta
    I just got a nasty surprise when I installed a website in Unicode Hindi (Indian language) on a server, all freshly entered unicode data is turning into question marks on the server. On my dev machine it works perfectly. I found that I have MySQL version 5.0.45 (installed in default by Plesk I guess). On my dev machine i have version 5.1.33. I believe the problem could be due to the version difference. The new version of MySQL apparently has better support for Unicode than the older one. I want to upgrade MySQL on my Windows Server machine with Plesk installed on it I am reluctant to just install the new version using the mysql installer because Plesk maintains some custom settings for mysql and I am afraid the new version could change those settings and break my db. Can anyone tell me do I have to do anything special to install MySQL on plesk on windows or can I just use the new version installer?

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  • Sql Server 2005 database lost, How to recover all records. MDF/LDF size is same as it should be

    - by Shantanu Gupta
    Few months back, I installed a sql server 2005 on one of my client machine. I gave him a backup option to take backup timely but he never took any backup. Today he called me that "i m not able to see any record of mine." I visited at my clients system and saw that none of the record was present on the tables. There was not even a single row in any of the tables. Then I checked if he has any backup file which i found to be absent. I asked him the reason what could be the possible cause. He said it might be due to virus. After this I checked the size of mdf and ldf file and found it should be what it is. when i created his server mdf ldf file had 2MB of database now it is 83 MB and 193Mb mdf/ldf respectively. This shows the data is still present in it but it is not being displayed. What could be the possible cause and how can i restore all data back to my tables ?

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  • iptables forward rule not working in openwrt

    - by Udit Gupta
    I am trying to apply some iptables forwarding rules in openwrt. Here is my scenario - My server has two cards ath0 and br-lan. br-lan is connected to internet and ath0 to private network. The other m/c in n/w also has ath0 that connects with this server's ath0 and they are able to ping each other. Now, I want other m/c in network to use internet using br-lan of server so I thought of using iptables forwarding rule- Here is what I tried - Server : $ ping 1.1.1.6 // <ath0-ip of client> works fine $ iptables -A FORWARD -i ath0 -o br-lan -j ACCEPT $ /etc/init.d/firewall restart Client : $ ping 1.1.1.5 // <ath0-ip of server> works fine $ ping 132.245.244.60 // <br-lan ip of server> (not working) I am new to iptables stuff and openwrt. What I am doing wrong here ?? Any other help if anyone could suggest for my scenario Edit- m/c - machine n/w - network

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