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Search found 206 results on 9 pages for 'muahammad yousuf saif'.

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  • What is the difference between yum, apt-get, rpm, ./configure && make install

    - by Saif Bechan
    I am new to Linux and am running CentOs. When I want to update or install certain software I came across three ways. Sometimes it's: yum install program rpm -i program.rpm wget program.tar.gz unpack ./configure make make install That last one is a real pain, esp when you come from windows where a program install is usually one click and then a nice guide. Now can someone please explain to me: Why are there so many different ways to do this? Which one do you recommend to use and why? Are there any other ways for installing programs?

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  • Setting up Amazon Cloudwatch to get an alert when you server is down

    - by Saif Bechan
    I have an instance running on Amazon EC2 that I turned into a webserver. Now I have been looking at cloudwatch, but I do not know if it is the correct tool for the job. Basically I want to get informed when the server is down, for whatever reason. Maybe the server got hacked, or the server shut down for whatever reason, I want to get a notification on that. I have enabled clouwatch, and tried to set up a alert, but I only see things like network in-out or cpu usage, an d metrix. Now I do not know if these will do the trick.

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  • Two way SSH authentication

    - by Saif Bechan
    I have installed ASL and it recommends me that I implement a two way SSH authentication. I have some questions about it. I understand the general idea that you need to login with both a key and a password. I am working from a laptop, what will happen if my laptop get's stolen. Will I never be able to login again??

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  • How to uploads to the web work on local networks

    - by Saif Bechan
    Let's say I have two computers hooked up as a home network. They both use the same router, and the router is hooked up to the to the net. Now lets say I am working on computer A, and I can access files on computer B. Computer A has a drive that is mounted on computer A as a network drive. Now I want to upload a file to a website. In the browser of computer A I open a browser, and go the website. On the website I select 'upload file', now in the file browser I go to the network drive, and select a file on computer B to upload. What happens in this case. Is the file uploaded directly from computer B to the website, or is the file first transferred to computer A, and then to the website.

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  • Do you think Microsoft is finally on the right track with its Windows 7?

    - by Saif Bechan
    It has been a while now since Windows 7 has been released. So far I didn't hear of many major complaints about it. I can remember the time that Windows Vista hist the shelves. There were major complaints from both experts and just regular users. I do a lot of OS installs for just regular users. These are mostly family and friends, and sometimes there are some customers. Up till now I mostly still use Windows XP SP3, because it is stable and most people are familiar with it. I did Vista for some users but they always call me back with all sorts of questions and in the end I had to downgrade them to XP. Do you think it is safe now to recommend Windows 7 as a good operating system? Offcourse their hardware has to support it, but let's say that is the case. If you install Windows 7 a lot for people, what are the complaints about if you get them?

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  • Redirecting traffic to a https site

    - by Saif
    In our mail server there are multiple virtual email domain hosted. User can use webmail.example.com (this is the first apache virtualhost) to check mail or they can use mail.THEIR-DOMAIN.com. If the put mail.THEIR-DOMAIN.com apache shows the webmail.example.com as it is the first virtualhost and mail.THEIR-DOMAIN.com doesn't exist. Recently we imposed https for webmail.example.com and added this mod_rewrite rule: RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} But now users not getting the default webmail page as they were getting before. How can we redirect all request coming to the URL "mail.ANY-DOMAIN.com" to "https://webmail.example.com"? I've tried the following but it didn't work: RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (mail.*) https://webmail.example.com Thanks for your help in advance.

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  • How and where do you manage your domain names?

    - by Saif Bechan
    In the past several years doing web development I often times needed to buy new domain names. I changed registrars a lot also so over the years I have multiple domain names scattered over different registrars all over the world. Now I want to bring a little structure into my business, and I am at the point that I want to be able to have easy control over my domain names in a convenient way. Does anyone have an idea on what the best way is to give structure on this. I have made some suggestions maybe you can comment on them for me. 1) Just leave it as it is I can leave everything as it is. To make adjustments I have to log into different panels, and for some registrars I have to email the changes. 2) Transfer all the domains to one registar This will cost a lot, about 10 usd per domain name. But if I can find a registar where I have full control over DNS this is worth looking at. Can you give me some comments on how you are doing things now. Maybe also which registrar you prefer on doing things.

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  • Which guide do you recommend on setting up Nginx

    - by Saif Bechan
    I am setting up an LEMP (Nginx, MySQL, PHP on Linux) from scratch. There are a lot of guides available online in all different forms. Now I want a setup with virtual hosts, and only serve dynamic content (PHP). My static files(images,css,js) are on a CDN. Do you know of a good guide on setting up the LEMP installation.

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  • Are there free FTP serer backup repositories

    - by Saif Bechan
    I was wondering if there is a free service that provides a repository for your backups. These are backups of my server, there are usually about 200mb. I want to FTP the last 2 or 3. I am looking for a service that maybe provide some gigs of space and with FTP access. Looking at email providers such as gmail and hotmail that give you a couple of gigs of free space, this should also be possible or am i horribly wrong.

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  • Which DNS settings are used when setting up server

    - by Saif Bechan
    I have a server and want to run my own name server service. Now I have set it up already and it works not, but I do not know where the exact settings are stored. On my server I use Plesk. When I edit DNS settings there I think it is stored in named.conf. Named is installed on the server, and BIND. Now I also have a panel from my registrar. This is separate from my server. Both places I can add the normal MX,A,CNAME, etc records. Now where is the best way to place this settings. Currently I have the same records on both places, on the server and at the registrar panel. I am correct to just add all the records at the registrar panel, and remove everything from within PLESK, and just don't run DNS on my server, because it is already done in the registrar panel. Or should I add the records in both places.

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  • Shell script to block proftp failled attempt

    - by Saif
    Hello, I want to filter and block failed attempt to access my proftp server. Here is an example line from the /var/log/secure file: Jan 2 18:38:25 server1 proftpd[17847]: spy1.XYZ.com (93.218.93.95[93.218.93.95]) - Maximum login attempts (3) exceeded There are several lines like this. I would like to block any attempts like this from any IP twice. Here's a script I'm trying to run to block those IPs. tail -1000 /var/log/secure | awk '/proftpd/ && /Maximum login/ { if (/attempts/) try[$7]++; else try[$11]++; } END { for (h in try) if (try[h] > 4) print h; }' | while read ip do /sbin/iptables -L -n | grep $ip > /dev/null if [ $? -eq 0 ] ; then # echo "already denied ip: [$ip]" ; true else logger -p authpriv.notice "*** Blocking ProFTPD attempt from: $ip" /sbin/iptables -I INPUT -s $ip -j DROP fi done how can I select the IP with "awk". with the current script it's selecting "(93.218.93.95[93.218.93.95])" this line completely. But i only want to select the IP.

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  • where is this SPF problem occuring

    - by Saif Khan
    Hi, Inbound mail to a specific user is been forwarded to his external mailbox at another domain. Add mails are routed correctly with the exception of one domain. When mail are sent to users of my domain, including that user, the mails are delivered to everyone except him...as the mail admin I am getting the message The following recipient(s) cannot be reached: usermailbox on 1/10/2011 1:27 PM There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. email.speedimpex.com #5.5.0 smtp;587 [email protected] sender domain does not match SPF records I am sure this has nothing to do with my mail server, however, can someone confirm?

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  • Choose default program to open the shortcut in Windows 7

    - by Saif Bechan
    Is there a way to specify which program should open the shortcut. Take browsers for example. My default browser is Firefox. I have some important shortcuts on my desktop that don't perform well in Firefox, so I want them to open in Internet Explorer. Important ! I know there are other ways of doing this. Such as creating favorites. But I need this feature also for other files, not only internet shortcuts. I like to work with specific programs for specific files. So please try to help me with the problem of opening different files in different programs.

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  • ?????

    - by user758881
    ????lumosity.com???????“?????”????????????????????????????????????????,???????????,??????????????????????????? ??,??????????????????——?????????????????IT????????????????????????????????????,????????????????,????????????? ?????????????——????????????????????????????????????????,??????,????????????????????? ?????,“??????????????:????????????”?,76%??????,???????????????????,????????????(54%)?????IT???????????IT?????????? ????,Oracle??????????????????????,Denovo????????IT?????????2009???????????Oracle JD Edwards??????????Denovo??????????????ERP??????Oracle?????????????????????? “????????????????????,”Denovo????????????????Paul Herbka???“?????????????????????????????????????????????????????????????????”   ??Denovo??????????????????,??????????????????ERP?????????????????????????????????????,?????????????? “????????????????,”Herbka???“?????????????????????IT???????????????????????????????????????????,????????????????????????????????” ??????????: “?????:?????????????????????,” ???Deloitte & Touche????????????????,Irfan Saif,?????Oracle Profit Online ?? Jim Lein ?????????????Oracle??????????1999???JD Edwards,???????Oracle15?????????Evergreen,Colorado,????????????????????????????????????????,????Oracle???

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  • [PHP] Making a good singleton registry class structure which hold your objects

    - by Saif Bechan
    I am working on a web application in PHP. I have a singleton class called registry. This class will hold all the objects i need throughout my application, such as loader classes, template classes, database, classes, etc. When an object of the registry class is created I send it an array with the classes it need to load: // Create the registry $registry = registry::singleton(); // Store those core objects $registry->storeObjects(Array('session','db','page','template','errors')); In this example I only put some of the classes, to get the basic idea. Now I have some classes in the registry that use each other. For example the 'errors' object uses the 'page' object. Now I was wondering if it is a good practice to make an instance of the registry object in the errors object. Like this; class errors{ private $registry; public function __construct(){ $this->registry = registry::singleton(); } } So there is an instance of the registry object, inside an object of the registry object. This does not sound like a good idea to me. Anyone have a suggestion how to model such a thing?

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  • [PHP] Singleton class and using inheritance

    - by Saif Bechan
    I have am working on a web application that makes use of helper classes. These classes hold functions to various operation such as form handling. Sometimes I need these classes at more than one spot in my application, The way I do it now is to make a new Object. I can't pass the variable, this will be too much work. I was wondering of using singleton classes for this. This way I am sure only one instance is running at a time. My question however is when I use this pattern, should I make a singleton class for all the objects, this would b a lot of code replication. Could I instead make a super class of superHelper, which is a singleton class, and then let every helper extend it. Would this sort of set up work, or is there another alternative? And if it works, does someone have any suggestions on how to code such a superHelper class. Thank you guys

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  • Need help with setting up comet code

    - by Saif Bechan
    Does anyone know off a way or maybe think its possible to connect Node.js with Nginx http push module to maintain a persistent connection between client and browser. I am new to comet so just don't understand the publishing etc maybe someone can help me with this. What i have set up so far is the following. I downloaded the jQuery.comet plugin and set up the following basic code: Client JavaScript <script type="text/javascript"> function updateFeed(data) { $('#time').text(data); } function catchAll(data, type) { console.log(data); console.log(type); } $.comet.connect('/broadcast/sub?channel=getIt'); $.comet.bind(updateFeed, 'feed'); $.comet.bind(catchAll); $('#kill-button').click(function() { $.comet.unbind(updateFeed, 'feed'); }); </script> What I can understand from this is that the client will keep on listening to the url followed by /broadcast/sub=getIt. When there is a message it will fire updateFeed. Pretty basic and understandable IMO. Nginx http push module config default_type application/octet-stream; sendfile on; keepalive_timeout 65; push_authorized_channels_only off; server { listen 80; location /broadcast { location = /broadcast/sub { set $push_channel_id $arg_channel; push_subscriber; push_subscriber_concurrency broadcast; push_channel_group broadcast; } location = /broadcast/pub { set $push_channel_id $arg_channel; push_publisher; push_min_message_buffer_length 5; push_max_message_buffer_length 20; push_message_timeout 5s; push_channel_group broadcast; } } } Ok now this tells nginx to listen at port 80 for any calls to /broadcast/sub and it will give back any responses sent to /broadcast/pub. Pretty basic also. This part is not so hard to understand, and is well documented over the internet. Most of the time there is a ruby or a php file behind this that does the broadcasting. My idea is to have node.js broadcasting /broadcast/pub. I think this will let me have persistent streaming data from the server to the client without breaking the connection. I tried the long-polling approach with looping the request but I think this will be more efficient. Or is this not going to work. Node.js file Now to create the Node.js i'm lost. First off all I don't know how to have node.js to work in this way. The setup I used for long polling is as follows: var sys = require('sys'), http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/html'}); res.write(new Date()); res.close(); seTimeout('',1000); }).listen(8000); This listens to port 8000 and just writes on the response variable. For long polling my nginx.config looked something like this: server { listen 80; server_name _; location / { proxy_pass http://mydomain.com:8080$request_uri; include /etc/nginx/proxy.conf; } } This just redirected the port 80 to 8000 and this worked fine. Does anyone have an idea on how to have Node.js act in a way Comet understands it. Would be really nice and you will help me out a lot. Recources used An example where this is done with ruby instead of Node.js jQuery.comet Nginx HTTP push module homepage Faye: a Comet client and server for Node.js and Rack To use faye I have to install the comet client, but I want to use the one supplied with Nginx. Thats why I don't just use faye. The one nginx uses is much more optimzed. extra Persistant connections Going evented with Node.js

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  • How do you protect against specific CSRF attack

    - by Saif Bechan
    I am going trough the OWASP Top 10 list of 2007 and 2010. I stumbled upon Cross Site Request Forgery (CSRF) this is often called session riding as you let the user usee his session to fulfill your wishes. Now a solution to this is adding a token to every url and this token is checked for every link. For example to vote on product x the url would be: 'http://mysite.com?token=HVBKJNKL' This looks like a solid solution to because a hacker can not guess the token. But I was thinking of the following scenario(I do not know if it is possible): You create a website with an hidden iFrame or div. After that you can load my website in it either using just the normal iFrame or ajax. When you have my website loaded hidden inside your website, and the user has a stored session, the following can be done. You can retrieve the token from the URLS, and still do all the actions needed. Is it possible to do something like this. Or is it not possible to do this cross domain.

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  • CSRF (Cross-site request forgery) attack example and prevention in PHP

    - by Saif Bechan
    I have an website where people can place a vote like this: http://mysite.com/vote/25 This will place a vote on item 25. I want to only make this available for registered users, and only if they want to do this. Now I know when someone is busy on the website, and someone gives them a link like this: http://mysite.com/vote/30 then the vote will be places for him on the item without him wanting to do this. I have read the explanation on the OWASP website, but i don't really understand it Is this an example of CSFR, and how can I prevent this. The best thing i can think off is adding something to the link like a hash. But this will be quite irritating to put something on the end of all the links. Is there no other way of doing this. Another thing can someone maybe give me some other example of this, because the website seems fairly fugue to me.

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  • Serving static content from cookie less domain and mod_deflate

    - by Saif Bechan
    I have two domain. One domain with my main website and the other with js/css/etc.. files, static content. mod_deflate is enabled for both domains, but when i run ySlow in FireFox it says none of my static content is compressed. When i bring back the js or css file to my normal domain it gets compressed right. Only when its served from the other domain is it not compressed. Do i have to do some more configuration for this to work? I am using this line in my .htaccess file AddOutputFilterByType DEFLATE application/x-javascript text/css text/html text/xml text/plain application/x-httpd-php I tried to but the line in my httpd.conf file but it gives me the same results. PS. If this is more of a serverfault question i am sorry for this. But i see a lot of questions here concerning mod_deflate and ySlow

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  • Is there a difference between long-polling and using Comet

    - by Saif Bechan
    I am implementing a system where I need real-time updates. I have been looking at certain scenarios and among all was Comet. Implementing this I do not see any way this is different from traditional long-polling. In both cases you have to send a request, and then the server send a response back. In the browser you interpret the response and then you start a new request. So why should I use comet if in both cases I need to open and close connections.

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