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  • How to secure postfix to find out whether the emails are coming really from the sender?

    - by codeworxx
    Is it possible to secure postfix in a way, that incoming emails are checked on whether the email comes really from the sender? Is that possible to write php script and chose a sender, like the mail is really coming from the sender and what are the possibilities for postfix to find out that this mail is not actually coming from the real sender? What I have found out and activated are the options smtpd_sender_restrictions = reject_unknown_sender_domain unknown_address_reject_code = 554 smtpd_client_restrictions = reject_unknown_client unknown_client_reject_code = 554 Please mention, whether I have missed out on any points!

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  • using web proxies - safe to enter passwords?

    - by bergin
    Hi Wanted to check something on a local site and see how the outside world sees it. however, using a web proxy im not sure that when i enter my credentials the proxy wont record this and give the proxy owner access to my site. is there another way to see my own site as though I was on the other side?

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  • Initrd and Initramfs

    - by nitins
    I have read about the differences between the two from stackoverflow. But I am still finding it difficult to understand tmpfs and the real advantages of initramfs over initrd. I find that on RedHat EL 5 or Ubuntu 12.04, I have only initrd files in /boot. However RedHat EL 6 has both intird and intramfs files. Does that mean only Redhat 6 has implemented intiramfs and we still have initrd image there?

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  • MySQL database Int overflow and can’t login in.

    - by Ryan Smith
    I have a MySQL database on my server and I"m pretty sure it's an int over flow on one table with an auto_increment field that's crashing it. I can delete the table, it's not very important, but I can't get into the server. Is there anyway to delete that database from the file system or without logging into MySQL? HELP! THE WORLD IS ENDING!

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  • Is it possible/advisable to run VMware Server ESX/ESXi on a laptop?

    - by cletus
    The idea of having a small footprint hypervisor as the primary OS on a laptop or desktop where every "real" OS is a guest appeals to me. Now I realize this software is more typically used on blades and the other servers but can it be done on a normal PC? Should it be? What requirements are there (eg hardware/BIOS/chipset)? Is there a performance impact for doing so? Is it a good/bad idea?

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  • How do I mirror a MySQL database?

    - by user45745
    I'm running two load balanced servers for one website, and I'd like the databases to be synchronized. Queries may be run on either of the two servers because they are both production sites, so the replication can't just work one way. It doesn't have to be in real-time, just fairly accurate so people don't notice a difference when they get switched to a different server.

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  • Always route a keypress to an application regardless of focus

    - by George Mauer
    I have to transcribe some audio (not enough to download dedicated software but enough to put my hacker hat on) and flipping back and forth between vlc and my text editor every time I want to pause is really annoying. Is there a way to always route a key-press (for example F10) to vlc regardless of what window has focus. Bonus - I have a Makey Makey so if I can get this working I can create a pedal and it will be my first real use of it!

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  • Ubuntu hardware compatability

    - by CT
    I have only previously played with ubuntu using virtual machines with VMware Fusion. So everything just sort of worked. I've never had to install any drivers. I'm considering putting it on some real hardware and using it as a media center. What should I be looking for as far as checking hardware compatibility? How does installing drivers work? Any quick and easy recommendations / guides?

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  • GUI tool to extract iso file contents on Linux (KDE)

    - by extropy
    I have an ISO CD image file and want to extract it's contents to a folder. I know there are ways to mount the image and stuff, but it's complicated. I'm looking for a GUI tool to open up the contets and extract needed files. On windows I would use WinRar to do this. K3B only allows me to burn the stuff, Arch does not work with ISO files :( Is there a similar tool on Linux, preferably from KDE world?

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  • What's the most durable netbook

    - by Keyslinger
    I'm about to spend more than two years in Latin America and I know from experience that not all computer equipment can handle the shifts temperature, air moisture, and other atmospheric variables as well as the generally greater number of shocks and jostles presented by developing-world transportation and unstable infrastructure/power grid. Is there any particular manufacturer, brand, or model of netbook or notebook that stands above the rest in terms of durability and ability to survive in harsh environments?

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  • Vulnerability research. Is it really research?

    - by Benjamin
    IT security people often say they do "vulnerability research". They defend the idea that they actually are doing some kind of "research". But is searching for vulnerabilities in software real research? A geologist looking for mines in the desert is doing "exploration", not "research".

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  • Will spreading your servers load not just consume more recourses

    - by Saif Bechan
    I am running a heavy real-time updating website. The amount of recourses needed per user are quite high, ill give you an example. Setup Every visit The application is php/mysql so on every visit static and dynamic content is loaded. Recourses: apache,php,mysql Every second (no more than a second will just be too long) The website needs to be updated real-time so every second there is an ajax call thats updates the website. Recourses: jQuery,apache,php,mysql Avarage spending for single user (spending one minute and visited 3 pages) Apache: +/- 63 requests / responsess serving static and dynamic content (img,css,js,html) php: +/- 63 requests / responses mysql: +/- 63 requests / responses jquery: +/- 60 requests / responses Optimization I want to optimize this process, but I think that maybe it would be just the same in the end. Before implementing and testing (which will take weeks) I wanted to have some second opinions from you guys. Every visit I want to start off with having nginx in the front and work as a proxy to deliver the static content. Recources: Dynamic: apache,php,mysql Static: nginx This will spread the load on apache a lot. Every Second For the script that loads every second I want to set up Node.js server side javascript with nginx in te front. I want to set it up that jquery makes a request ones a minute, and node.js streams the data to the client every second. Recources: jQuery,nginx,node.js,mysql Avarage spending for single user (spending one minute and visited 3 pages) Nginx: 4 requests / responsess serving mostly static conetent(img,css,js) Apache: 3 requests only the pages php: 3 requests only the pages node.js: 1 request / 60 responses jquery: 1 request / 60 responses mysql: 63 requests / responses Optimization As you can see in the optimisation the load from Apache and PHP are lifted and places on nginx and node.js. These are known for there light footprint and good performance. But I am having my doubts, because there are still 2 programs extra loaded in the memory and they consume cpu. So it it better to have less programs that do the job, or more. Before I am going to spend a lot of time setting this up I would like to know if it will be worth the while.

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  • Automake thumbnail

    - by Webmaster
    What I need to do is a program that given (as a command line argument) a directory with more directoreies inside, and 4 Pics inside of each dir, the program makes a thumbnail of the 4 files and glues them together (2 rows, 2 columns) and renames that image to the name of the directory. I think it could be done with a combination of a program and shell scripting (I'm experienced in M$, but new to linux). Some real examples would be great. Thanx in advance

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  • How could I make a bash script to execute apt-get?

    - by poz2k4444
    I'm trying to automatize some configurations I have with bash script, I've never done this before so I tried with something easy like a Hello World! and everything works just fine, but then I tried something like this: #!/bin/bash sudo su apt-get purge postfix and it doesn't do anything, I check and postfix is still installed, and at any time it asks for any entry of mine, I just tried with apt-get but I'll do things like ssh-keygen or even write files I guess with cat or something, how could I do the script working and also seeing what's going on?

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  • Looking for a way to diff many server's filesystem

    - by Itai Ganot
    There's a motivation in my office to make sure that all file systems on all servers in the production environment (It's a Windows environment) are identical until the last file and i'm looking for a program/tool which can help me achieve this goal. What i actually look for is a tool that will allow me to diff server's file systems by connecting them remotely (as they are spreaded around the world). Anyone knows a tool which allows it?

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  • Create and manage child name servers (glue records) within my domain?

    - by basilmir
    Preface I use a top level domain provider that only allows me to add "normal" third-party name servers (a list where i can add "ns1.hostingcompany.com" type entries... nothing else) AND "child name servers" which i can later attach to my parent account ( ns1.myowndomain.com and an ip address). They do not provide other means of linking up. I want to host my own server and dns, even with just one name server (at first). My setup: Airport Extreme - get's a static ip address from my ISP Mac Mini Server - sits behind the Airport and get's a 10.0.1.2 My problem is that i can't seem to configure DNS correctly. I added a "child nameserver" with my airport's external static ip address at the top level provider, so to my understanding i should have all DNS traffic redirected to my Airport. I've opened port 53 UDP to let the traffic in. Now, what i don't get is this. My Mini Server is sitting on a 10.0.1.2 address and i have setup dns correctly, with an A record to point and resolve my server AND a reverse lookup to that 10.0.1.2. So it's ok for "internal stuff". Here is the clicker... How, when a request comes from the exterior for a reverse lookup, does the server "know" ... well look i have everything in 10.0.1.2 but the guy outside needs something from my real address. I can't begin to describe the MX record bonanza... How do i set this "right"? Do i "need" my Mini Server to sit on the external address directly (i can see how this could be the preferred solution, being close to a "real" server i have in my mind). If not... do i need a PTR record on the 10.0.1.2 server but with the external address in there? My dream: I will extend this "setup" with multiple Mini's in different cities where i work. I want a distributed something (Xgrid comes to mind). PS. Be gentle, i've read 2 books and the subject, and bought both the Lynda Essentials and DNS and Networking to boot, still i'm far from being on top of things.

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  • Network Switch fast eneogh for Dlink DIR-655

    - by Recursion
    I am setting up a server and want to keep it outside of my local network which is inside of the Dlink 655 router. I originally bought the dlink router mainly because it is fast, much faster than any other consumer router I have tried. The only router which is capable of real 10MB/s d download speed. I need a switch which will not cause a bottle neck to the router. The switch will connect the to the server and the dlink router.

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  • Change the title of a terminal (Gnome)

    - by Kevin
    I would like to customize the name of the tab in Tilda (I guess that it doesn't change anything from the Gnome-terminal's behavior), but I can't find the exact sequence ... so far, I figured out that Bash does it when displaying my PS1 prompt: echo $PS1 \[\e]0;HELLO\a\]\[\033[01;32m\]\u\[\033[00m\]@\[\033[1;35m\]\h\[\033[00m\]:\[\033[01;34m\]\[\033[00m\] I guess that \[\e]0;HELLO\a\] is responsible for the title to be set to 'HELLO', but when I start echo -ne "\[\e]0;HELLO WORLD\a\]" only writes '[]' what's wrong with my command ?

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  • Is there extensible structured file analyzer, like network analysis tools?

    - by ???
    There are many network analysis tools like Wireshark, Sniffer Pro, Omnipeak which can dump the packet data in structured manner. I'm just writing my own file analyzer for general purpose, which can dump JPEG, PNG, EXE, ELF, ASN.1 DER encoded files, etc. in tree style. There are so many file formats in the world that I can't handle them all. So I'm wondering if there's some software already there, with pluggable architecture and a large established file format repository?

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  • JBoss naming service port conflict

    - by Kramer
    I am having trouble getting JBoss started. I am running JBoss 5.1.0 on Mac OSX (yes, I know it is an old version, but that’s what the application is certified on for now). I am using Apple’s JVM 1.6.0_37. I get the following error when trying to use JBoss (there are some more exceptions, but these are the first few): Error installing to Start: name=jboss:service=Naming state=Create mode=Manual requiredState=Installed java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:218) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:383) 16:57:15,596 ERROR [AbstractKernelController] Error installing to Real: name=vfsfile:/Users/home/server/jboss-5.1.0.GA/server/myserver/conf/jboss-service.xml state=PreReal mode=Manual requiredState=Real org.jboss.deployers.spi.DeploymentException: Error deploying: jboss:service=Naming at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:118) at org.jboss.system.deployers.ServiceDeployer.deploy(ServiceDeployer.java:46) Caused by: java.rmi.server.ExportException: Port already in use: 1098; nested exception is: java.net.BindException: Can't assign requested address at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:310) Caused by: java.net.BindException: Can't assign requested address at java.net.PlainSocketImpl.socketBind(Native Method) Now I know what you are thinking, that I am running something that conflicts with that port, but I have used lsof and there is nothing listed on that port. I have tried changing the port in conf/bindingservice.beans/META-INF/bindings-jboss-beans.xml: <bean class="org.jboss.services.binding.ServiceBindingMetadata"> <property name="serviceName">jboss:service=Naming</property> <property name="bindingName">RmiPort</property> <property name="port">5098</property> <property name="description">Socket Naming service uses to receive RMI requests from client proxies</property> </bean> Unfortunately, I then get the name errors with the new port number. I also installed a network monitoring tool on my box and it doesn't look like any ports are being opened when I start jboss, but it is possible, that the tool might be missing a port that is opened and then closed quickly. Any ideas what could be the problem or how to fix it?

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  • how to check if your isp does video throttling?

    - by bbaja42
    I've recently changed isp; and noticed that I no longer can watch video sites like youtube in real time; I need to wait for buffering first. In both ISPs, my speed was same 5 megabits per second. I've checked normal download of files, and torrents, and they all work fine. Also, checked other video sites, same problem. Used other pc, same problem

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  • How to disable auto recover?

    - by user70010
    I've tried disabling "Save AutoRecover information" option, but to no avail. The window "Excel has recovered the following files" still pops up at the start. Any other ideas? UPD Auto-recover window is shown each start after I terminate Excel during my debug session. All file entries Excel shows in the auto-recover window are dated by year 1601. I checked Excel auto-recover folder, and there is no any real file there.

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