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• How to forward traffic using iptables rules?

  - by ProbablePattern

  I am new to iptables and I have been doing Google searches for a few days now without finding a good solution to this problem. I have computer A with a public ip address (say 192.0.2.1) that can access the Internet unrestricted. I have another computer B with a private ip address (192.168.1.1) that can only access computer A. How do I use iptables to forward network traffic from B through A to the Internet? I need to use http, ftp, and https in order to use apt-get with sudo. Both computers run Ubuntu linux. I have tried using Squid but I think it is far too complicated for what I need to do.

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• syslog facilities

  - by user65971

  Hi, I have an application (in java) running in a windows PC and I want to send logging messages to a syslog server running in a linux box somewhere in the network. The problem I have is, that it is not clear to me what should I use as facility in this case. I.e. can I (/should I) send the logging info as one of LOCAL0-LOCAL7? Or are they not supposed to be used by remote applications? It is not clear to me if they are usable or not. Should I use USER instead? Could anyone help me on this please? Thank you

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• Hide the ports in the url of a tomcat application

  - by S.M.09

  I have setup tomcat 6 on a server with several different instances which run on different ports For Eg: http://10.XXX.XXX.XXX:8080/myAPP1 http://10.XXX.XXX.XXX:8088/myAPP2 http://10.XXX.XXX.XXX:8082/myAPP3 and so on... These urls are available two the users using these and other applications Now I want to hide the ports on which each of the applications are running... So that the user could see only something like this http://10.XXX.XXX.XXX/myAPP1 http://10.XXX.XXX.XXX/myAPP2 http://10.XXX.XXX.XXX/myAPP3 What is needed to be done for this I have achieved this for one url (i.e. one port) using the firewall rules and redirect the request on HTTP 80 port to the port that tomcat is listening.. But I want such patter to appear for all the urls... How can I go about this? Specs HOST M/C : 64 bit OS: Linux Redhat Tomcat : 6.0

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• Doing "text mode 'splash' game" during boot.

  - by Vi

  Sometimes I want to do something (for example, playing a simple text-mode game) while the system is booting up. This is especially useful when lengthy reiserfs transaction replays are happening. Current hacky way of doing it is: Put the program on initramfs. Before running /sbin/init, "openvt 2 /my/program". Turn off messages from kernel (sysrq 0) Override /dev/console with /dev/null (to prevent boot messages). The problems are: There are STILL some messages interfering with program output. I can't see boot messages by switching to that virtual terminal back. After finishing the boot sequence, /dev/tty2 ends up being attached both to getty and my program. How to do it properly without of running graphical splashes? The system is Linux Debian Squeeze, no dependency based sysv scripts.

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• Hard drive partition size wrong. How do I resize without loss of data?

  - by BreezyChick89

  $ fsck fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) The filesystem size (according to the superblock) is 610471680 blocks The physical size of the device is 536870911 blocks Either the superblock or the partition table is likely to be corrupt! It should be 1 partition but it now shows 2.2tb partitioned and .3tb unpartitioned How do I make the first partition correctly be 2.5tb without destroying whatever is in either partition? I did not raid or anything. My devices have been getting repeatedly corrupt by thunderstorms. Looks like people recommend doing something like in other places. sudo resize2fs /dev/sdc1 610471680

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• df -h overreports disk space on VPS

  - by Rincewind42

  When I run the command df -h on my new Ubuntu linux vServer I get the following: # df -h Filesystem Size Used Avail Use% Mounted on /dev/hdv1 466G 33G 434G 7% / none 16M 0 16M 0% /tmp Running du -sh gives # du -sh du: cannot access `./proc/13624/task/13624/fd/4': No such file or directory du: cannot access `./proc/13624/task/13624/fdinfo/4': No such file or directory du: cannot access `./proc/13624/fd/4': No such file or directory du: cannot access `./proc/13624/fdinfo/4': No such file or directory 952M . The VPS should only have 5Gb of disk space but df reports 466Gb. How can I view the correct amount of disk space?

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• X11 forwarding through SSH

  - by martinjlowm

  I have been playing around with X11 forwarding the past few hours and so far I've managed to forward my desktop pc's X Server to my laptop, using X11VNC as server and X2VNC as client. X2VNC uses Xinerama to provide a dual-screen-like behavior between my laptop and my desktop pc. It's actually really great! I know that most Linux systems run Xorg and desktop environments on TTY7. Therefore I was thinking, is it in any way possible to have the VNC-tunnel tied to it's own TTY? It would be great to be able to switch forth and back between two TTY's in order to choose which machine to manage. And I would like this approach more than using Xinerama or a GUI.

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• Boot Loop contiues [closed]

  - by user1894750

  I am facing boot loop. My backend Linux works flawlessly, But the Zygote and System server does not workout. I can still use ADB and LIVE cat .. ps show that both Zygote and system_server process are there, But boot animation remains forever !! I have : 1 Wiped Data + Cache Partition 2 System Partition has been RESTORED.. There is NO PERMISSION problem... I think that there is *problem with Zygote and System_server ..* my device: Karbonn A9+ Dual Core Snap Dragon 1.2 Ghz Ram 386MB OS : ICS 4.04 Any suggestions ??

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• Running Debian as a Virtual Machine Host

  - by Tone

  I have a need to run a linux server to host subversion, bugzilla over Apache and also act as a file and print server. I also have a need to host Windows Server 2008 virtual machines for development purposes (I'm a .NET guy). The machine I have is a dual core AMD 2.5 Ghz w/2GB RAM. So here are my questions: 1) Should I run Debian (or some other distro) as the base AND create a Debian VM to host subversion, bugzilla and be my file/print server? or is it ok to use Debian as both my VM host and for those other reasons? 2) VMWare has a free server edition, Virtual Box also is another free option. Which one of these is better suited for what I need to do? Are there any other free (or inexpensive) alternatives out there? 3) Will I need a GUI with Debian in order to manage my VMs? 4) Can I run VMs without a GUI to conserve system resources?

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• Video streaming over multi display units

  - by ramdaz

  We have to share video across around 4/8 terminals at a public facility where we need to display live video from within the facility, as well as display messages(advertisements), and also play videos(not live) which need to be controlled centrally from another location. We can do central location handling over Internet, over ssh. What we want to do is connect cameras to a computer, and use the computer to display over multiple display units. We need to do live titling if possible. Once the live local telecast which usually takes about an hour or two a day, we would like to play other videos locally off the PC server. Preferably everything should run off Linux, since budgets are very constrained.... Addendum -- Its not over WAN, it's over a local area. I prefer not using LAN, we would rather use co-axial cable if possible. The reason is if it's LAN, I need some kind of an Networking device, at least a thin client

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• Is GPU active when there are not any monitors?

  - by Mixer

  Does GPU render anything when there is no monitor plugged in? Today I turned my old PC into some kind of a "server" which means that I want it running 24/7. I don't need any display (I will operate through ssh) so when everything was set up I removed my monitor. After a hour I checked my graphic card's cooling system and it was still hot. My graphic card is GeForce 8600 (with DVI connector), OS is Debian Linux. What is the best solution in this situation (standalone server) if GPU is active and I don't want it to waste power?

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• adding ftp user on ubuntu

  - by user46250

  I followed this tut http://www.trainsignal.com/blog/how-to-set-up-safe-ftp-in-linux to setup an ftp server with user account sudo mkdir -p /home/ftp/ftpuser sudo useradd ftpuser -d /home/ftp/ftpuser -s /bin/false sudo passwd ftpuser when I tried to connect with login ftpuser remotely it didn't work. It didn't work even with root UNLESS I removed root from ftpusers. I am confused ftpusers are the users NOT allowed to do ftp ? Where are the list of users allowed then and why can't I connect with ftpuser I created ?

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• How do I prevent my swf files being hotlinked, downloaded etc.

  - by undefined

  I have swf files that are embedded in a PHP page using SWFObject. These swf files are in the same directory as my PHP files. for example www.myurl.com/index.php embeds www.myurl.com/flashfile.swf, index.php and flashfile.swf are in the same directory. However I want to prevent people from being able to type in www.myurl.com/flashfile.swf and viewing the swf. I want the browser to deny access to this file unless it has been embedded by the PHP file. Should I move my swfs to another folder and protect this folder somehow - is this with the .htaccess file? I am running Apache on a linux machine. While my main concern is for swf files I would like to protect graphics used on the site too. all help appreciated thanks

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• What is the best way to shutdown hard disk?

  - by Sunil

  Right Now I'm using hdparm command in unix to shut down the hard disk but there are few issues with it. when it wakes back up it consumes lots power. Is there any other way to do it? Many times when I put my hard disk to sleep, I can see few bursts at the beginning and then after a while it goes to sleep. I think its because of the journaling system in ubuntu (which I use) Have anybody encountered that? What would be the best linux/unix operating system (eg: ubuntu/centos/redhat) to work on extensive hard disk operations? I would highly appreciate if you could share the problems you encountered while doing this operation.

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• Entries in `/etc/inittab` below last line - possible hack? [closed]

  - by Danijel

  Possible Duplicate: My server's been hacked EMERGENCY My Linux machine has been hacked lately. There are a few entires in /etc/inittab below the #end of /etc/inittab Something like: #Loading standard ttys 0:2345:once:/usr/sbin/ttyload I also have serveral of the following lines: 2:2345:respawn:/sbin/mingetty tty2 3:2345:respawn:/sbin/mingetty tty3 . . . I know that my /usr/sbin/ttyload has been hacked, and I have removed it, but I don't know if I need this is inittab, nor whether I had ttyload before. Is this file common? Should I remove this line?

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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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• What are the methods of separating network spaces in a LAN?

  - by dash17291

  Please detail me the methods. My thoughts: put the servers in separate (sub)networks the servers are forced to go through the firewall but no NAT is required assign more IP addresses to the internal interface of the server choosing gateway addresses from the clients and servers IP address ranges split DNS Netfilter/{iptables, ipset} could be heavily involved, I'm talking about Linux servers. See for example: Destination NAT Onto the Same Network from internal clients Please do not explain what is NAT or DNS. This is a theoretical question, but my poor English knowledge prevent me to describe it in a fancy fashion.

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• Missing kernel on debian-testing-amd64-DVD-1

  - by Kyrol

  I want to install the Debian testing linux version. But at a certain point of the installation, an error occurs: Impossible to install kernel. a compatible kernel version is missing... … or something like that. I see that the image ISO of the DVD is less than 4GB, but is impossible that there is no compatible kernel version for the system. I have an Asus X53Sc with Intel core I7-2630QM, Geforce GT 520MX.

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• who deleted my files?

  - by akalter

  I have some linux servers. On two of our server we have MySQL. We have daily backup on both machine. But the scripts are different. I saw both scripts. On one of them I saw the "delete older files" algorithm, but in the other this is happening but not from the script. I am trying to discover who deletes my files, because of that I want to use same script on both machine because of that in the script with the deletion I also copy the files to the another server, and I want to do that in both servers. Who have an idea who deleted my older backups? Thank you!

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• ASUS N550 laptop not charging on ubuntu after updating kernel

  - by OBY Trance

  I'm using Ubuntu 13.10 on a pretty new ASUS N550jv laptop. When I was using kernel linux-image-3.11.0-11 everything was quite well (kinda..), however, when I updated the kernel using the automatic update, the kernels which were released afterwards (12+) were faulty on my machine, and caused the battery not to be charged and only stay at their current charging level (even when the machine was off!) The only fix I had was to roll-back to the '..11' version (on boot screen - advanced options), and hard-reboot (AC cord disconnected and reconnected) but now version 14 was released and "pushed away" the good old version 11. How can I fix that?? Please help me...

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• Can't connect Tomcat via JMX

  - by Icarokun

  I couldn't connect to one Tomcat server via JMX in a Linux virtual machine. There was no firewall running. All seemed ok. By searching on the web I found out that I have to use the -Djava.rmi.server.hostname property to fix it. It worked, but I don't understand why. My machine has five Tomcat servers running, all of them have JMX enabled in consecutive ports (8008, 8018, 8028...), all of them have the same configuration and only one of them had this issue connecting JMX. No firewall, no -Djava.rmi.server.hostname property in any Tomcat. I understand the problem, but I don't understand why four of my Tomcat servers worked and one of them not. Why is this?

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• OpenVPN and brouting issue

  - by JavierMartinz

  I have a Guest XEN Machine in which I want to connect by OpenVPN to other network. But I have this problem: when I want to connect to that OpenVPN I get a lot of TLS handshake errors because I think that the packages did not come rightly. When, at the end, the guest machine achieve to connect (after several tries) I can't ping the other machines of the OpenVPN network. Except sometimes, where if I ping 20 times MAYBE i get ping-answer in 1-2 times. I think that this problem is related about how the HOST Xen machine 'filters' the packages to the bridge. I mean, I think that all the outgoing guest machines packages are good but the incoming traffic to the guests is not recognized well. How could I detect/solve the problem? Im using Debian Linux in both machines

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• Best 'free' option for alert notifications other than email/SMS

  - by Eureka Ikara

  Looking for a Linux script solution that can send alerts to a service such as Twitter, Skype or Google Talk and sends to Android and iPhone clients. Have found twurl for Twitter with previous Bash scripts using curl no longer supported. But twurl looks promising. But haven't seen how to get Android Twitter client to make a distinctive sound when a tweet arrives. Found some info about Skype4Py from several years ago that supports Skype Chats. But doesn't look like it is currently supported. Have tried a few CLI clients for XMPP/Google Talk including xmpp4r-simple and freetalk, but found xmpp4r-simple buggy and freetalk succeeded in sending one chat message, but most never arrived. Whatever is used needs to support Android and iPhone clients. Reason why email is problematic is that Gmail gets very upset when emails start flooding in every minute as a result of alerts. Any suggestions?

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• minimum required bandwidth for remote database server

  - by user66734

  I want to build a small warehousing application for my company. We have a central warehouse which distributes to 8 sales points across the country. They insist on an in-house solution. I am thinking to setup a central mySQL db Linux server and have the branches connect to it to store sales. Queries to the db from the branches will be minimum, maybe 10 per hour. However I need all the branches to be able to store each sale data ( product ID, customer ID ) in the central db at peak time at most once every five minutes. My question is can I get away with simple 24mbps/768kbps DSL lines? If not what is the bandwith requirement? Can I rely on a load balancing router to combine additional lines if needed? Can you propose some server hardware specs?

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• Is it possible to have Grub2's boot.img in the MBR and have it load core.img from a separate boot partition?

  - by wesley

  I have a multiboot system that I would like to use Grub to manage. The version of Grub shipping with my Linux distro is Grub2, and it installs its equivalent of stage 1.5-2, core.img, into the remaining sectors on the first track after the MBR but before the first partition. Unfortunately, those sectors are needed by another program. I have a separate primary /boot partition. If I could only keep boot.img as my MBR but have it look in the /boot partition for core.img rather than the embedded one in the sectors immediately following the MBR, everything would work fine. Is this possible with grub2?

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