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• Is that possible to route all mails sent to a mailbox to another server's mailbox

  - by Chau Chee Yang

  I have a Linux server that has local mail service. There are few user accounts on this server. User may send the mail to each other but that only restrict to LAN environment only. For example, I may # mail user1 to send mail to user1. User are not able to send mail to public. Some service like hylafax using this local mail service to send notification of fax status. I don't want to manage and maintain local mail service anymore. I have subscribed a package from ISP to host a public domain of my own. I wish to have my hylafax service to able to send the notification mails to public mail server, is that possible to do it? It is great if all mails that send to local mail server may forward to public mail server. That makes the local mail service serve mail forward only.

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• How can I tell if ZFS (zfs-fuse) dedup/compression is applied to a particular file?

  - by asari

  I have a zfs formatted partition using zfs-fuse for linux (Ubuntu). I had used it for a while, and then enabled dedup and compression on it (zfs set compression=on/dedup=on). Now I think I have some files that are dedup'ed and compressed, and file that are not yet. It was OK, but sometimes I was confused. Let's see, following command would consume almost 4GB of my zfs storage: cp oldfile.4GB newfile.4GB .. and this would consume almost zero: cp newfile.4GB newfile.4GB.2 This is because the old file is not yet compressed, so dedup not happened, I think. My idea is -- if I can find old files that are not yet dedup/compressed, I can perform batch copy/rename/remove them to eliminate duplicity and redundancy. But how I can check that? I know I can re-copy whole contents of my storage should work (even better with checking the time stamp of each file), but I'd be happier if I have zfsstat-like tool that shows some file properties.

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• Fix superblock size after dd?

  - by TreyK

  I've recently installed Linux Mint 11, and somehow my partition table ended up so that both it and the unallocated space for Windows 7 were inside an extended partition, which Windows didn't like when I tried to install. So, because I had spent a few hours configuring Mint already, I backed it up to my external hard drive using dd. I have restored it to the new partition I made for Mint, but new the partition isn't the same size as the one I dd'd from, so I'm getting yelled at for having a bad superblock size. Is there any way that I can fix this while keeping the new, smaller partition? -Trey

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• Can't find my.cnf on my VPS

  - by dan

  Ok i am a total noob when it comes to servers (but eager to learn). I am renting a VPS so i can host a magento store. The VPS is using Centos5 and DirectAdmin and XEN virtualization. I've read a bit about how to optimize magento and one suggestion is to edit 'my.cnf'. However i can't find this file anywhere from within DirectAdmin. I also can't connect to the VPS via console as my host has a console access via their website but it won't let me enter my root password it just hangs...(how do people normally connected to their linux VPS?) Please help? ThankYou.

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• How can i resolve all external addresses to internal address?

  - by Darian

  I am currently setting up a Linux server for a WIFI access-point. When ever someone who is connected to the hotspot/access-point? tries to reload a page they get forced onto the one page. Note: this wont have internet access! ie: user tries accessing www.google.com = it returns 192.168.1.200 or example.domain I've read that "dnsmasq" can be used to redirect any external addresses to an internal address. but haven't had any luck. Anyone have an example of a config for "dnsmasq"? I have also read that this can be done through a proxy?

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• For virtual machines, when SMP is available on the host, should guest also have SMP setup?

  - by supercheetah

  I'm trying to find out the best "bang for my buck" so to speak in regards to virtual machines, and SMP. I have an Intel Core 2 Duo, which of course has two cores and the VT extensions, and I'm running Ubuntu Linux (host) on it with VirtualBox, which has Windows Vista (guest). Currently I've got the guest machine setup for two processors to give Windows a chance to manage its own parallelism, but I'm not certain that it's any faster. I've tried it with just one processor, but it's hard to tell if it's any better. Any thoughts? Should the guest have two processors setup?

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• DPMS, keep screen off when lid shut

  - by Evan Teran

  I have a laptop running linux. In my xorg configuration, I have DPMS setup so that the screen automatically turns off during several events. In addition to that I have to the following script tied to ACPI lid open/close events: #!/bin/sh for i in $(pidof X); do CMD=$(ps --no-heading $i) XAUTH="$(echo $CMD | sed -n 's/.*-auth \(.*\)/\1/p')" DISPLAY="$(echo $CMD | sed -n 's/.* \(:[0-9]\) .*/\1/p')" # turn the display off or back on export XAUTHORITY=$XAUTH /usr/bin/xset -display $DISPLAY dpms force $1 done Basically, this script takes one parameter ("on" or "off") then iterates through all of my running X sessions and either turns on or turns off the monitor. Here's my issue. When I close the lid of the laptop, the screen goes off as expected, but if a mouse event occurs (like if something bumps into the table...) then the screen turns back on even though it is closed (I can see the light through the side of the laptop). Is there a way to prevent the screen from turning on during a mouse event if the lid is closed?

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• Which FLOSS text editor is most like kwrite without being KDE-based?

  - by darenw

  Among text editors on Linux, I usually prefer KWrite. I like that I can quickly turn on/off line numbers and line wrap in the View menu. Other settings are easy to change. Other text editors I've used in the past, such as Gnome's gedit, bury line numbering and wrapping checkboxes deeper into the menu system, making it more distracting to change while concentrating on real work. However, KWrite is a KDE app. On Ubuntu it drags in over a dozen other packages, which I suspect I don't really need. Why would a text editor need all that? It's slower to start up than some other editors I've tried. I'm also trying to run an all-gnome system w/o any KDE, just to see how far I get with it. So, what GUI text editor isn't KDE-based, has few dependencies and quick start-up, easy to change line wrap and numbering, and general similarity to KWrite? What comes closest?

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• Nearest PC equivalent to Mac Target Disk Mode?

  - by username

  Mac firmware has a special boot mode that allows you to offer its internal hdd to another computer as an external disk (you just connect the two machines via an IEEE 1394 cable). Only the second machine needs a functioning OS installed. Any good suggestions for something similar on the PC side of things? Block level access isn't important to me, I'd just like to be able to copy files off it. It doesn't matter to me if it uses Ethernet, IEEE 1394, or wifi - I just like having a quick way to access files on a client PC. Is there any single-purpose Linux distro specially designed to do this? It'd be nice to have something super simple, quickbooting, and small that I could install on a USB drive. I used to use Knoppix, but it's overkill as a Target Mode replacement.

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• Calculate data transferred in a local LAN

  - by ramdaz

  How do you calculate the data flown between a computer and the gateway computer. I have a Linux router/gateway running IP Tables which routes internet traffic in a LAN. I have individual users with IP/MAC Address mapped who access Interet through the gateway computer. I would like to find out the traffic utilized by individual users. Is it possible for us to find out what kind of traffic was HTTP, SMTP, FTP etc. Is it also possible to pool the information on hourly basis, and get specific info so that I can store information in a database? I have heard of IP Accounting? Is that the right way

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• Unable to write into character device file in Ubuntu

  - by Surjya Narayana Padhi

  I just written a linux character driver. I created one character device file named X. I can see that file in /dev folder. Now I want to do some read/write operation into this file. I opened the filed in VI editor and write some text into it. I used :wq and exited. It didn't show any error. Now when I do cat on that same file I am not able to see any content. I tried it several times. The same situation. Please let me know If I am doing something wrong....

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• Apache is running; however, it reports that it is not, and it will not restart.

  - by solo

  Apache is running; however, it reports that it is not, and it will not restart. # /etc/init.d/httpd status httpd.worker is stopped # /usr/sbin/lsof -iTCP:80 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME httpd.wor 1169 root 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1211 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1213 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1215 daemon 3u IPv6 2974 TCP *:http (LISTEN) httpd.wor 1352 daemon 3u IPv6 2974 TCP *:http (LISTEN) #/etc/init.d/httpd restart Stopping httpd: [FAILED] Starting httpd: [Wed Mar 24 10:33:51 2010] [warn] module proxy_ajp_module is already loaded, skipping (98)Address already in use: make_sock: could not bind to address [::]:80 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available, shutting down Unable to open logs [FAILED] OS: Linux DISTRO: CENTOS 5 Restarting the server didn't help, nor did killing apache and starting it. Any idea what is causing this inconsistency?

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• Ask a DNS server what sites it hosts - and how to possibly prevent misuse

  - by Exit

  I've got a server which I host my company website as well as some of my clients. I noticed a domain which I created, but never used, was being attacked by a poke and hope hacker. I imagine that the hacker collected the domain from either hitting my DNS server and requesting what domains are hosted. So, in the interest of prevention and better server management, how would I ask my own DNS server (Linux CentOS 4) what sites are being hosted on it? Also, is there a way to prevent these types of attacks by hiding this information? I would assume that DNS servers would need to keep some information public, but I'm not sure if there is something that most hosts do to help prevent these bandwidth wasting poke and hope attacks. Thanks in advance.

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• Running make for Nginx throws a “multiple target patterns” error

  - by Justin Meltzer

  When I run make inside my installed nginx directory I get the output: make -f objs/Makefile make[1]: Entering directory `/home/ec2-user/nginx/nginx-1.2.4' objs/Makefile:110: *** multiple target patterns. Stop. make[1]: Leaving directory `/home/ec2-user/nginx/nginx-1.2.4' make: * [build] Error 2 I am on an Amazon Linux AMI. The steps I took from the beginning was wget /path/to/nginx/tarball tar xvf nginx-1.2.4.tar.gz cd nginx-1.2.4 ./configure --prefix=/nginx --a-bunch-of-other-options Then I ran make. Also I installed make by running sudo yum install make Please let me know if there's any other information I should be providing.

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• How difficult is it to setup a mailserver?

  - by Jacob R

  I want a secure mail solution, as I am looking to move away from Google and other parties looking into my private data. How much of a PITA is it to setup my own mailserver? Should I go for an external provider with a good privacy policy and encrypted data instead? I have a VPS running Debian (with a dedicated IP + reverse DNS), and I'm a fairly capable Linux administrator, having setup a couple of webservers, home networks, and looking over the shoulder of sysadmins at work. The security I currently have on the VPS is limited to iptables and installing/running the bare minimum of what I need (currently basically irssi and lighttpd). When setting up a mail server, is there a lot of stuff to take into consideration? Will my outgoing mail be marked as spam on other servers if I don't implement a number of solutions? Will reliable spam filtering be difficult to setup? Can I easily encrypt the stored mail?

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• How can I send a Wake on Wireless LAN (WoWLAN) / Wake on Demand request manually?

  - by pioto

  This is similar to, but not the same as, http://serverfault.com/questions/1721/is-wireless-wake-on-lan-possible. I know it is supposed to be possible. The question is, how do I do whatever the AirPort Basestation will do? All I can find so far is that supposedly I need to send something with Wireless Multimedia Extensions (WMM): Basically, I want to be able to wake up my Mac Mini remotely, probably using my Linux laptop. Does anyone know of a tool to do this? Basic Wake on LAN tools do not seem to be the right thing. I don't need the Sleep Proxy Service bit, because I already know the MAC address of the system I want to wake up.

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• Apache - setting up a subdomain

  - by Adam

  I'm having trouble getting a subdomain working for an Apache Linux Install. Following is what I've configured: DNS: connect.goneglobal.com. CNAME 54.251.35.112 Apache httpd.conf: <VirtualHost *:80> DocumentRoot /var/www/html/connect.goneglobal.com ServerName connect.goneglobal.com </VirtualHost> restart httpd - this ip is registered to this server - works for other sites on this apache. (first time I've tried a subdomain). Appears the issue is with DNS potentially and it doesn't seem to get to the site. Note: I have an index.php in the Documentroot. Note: there is an A record for goneglobal.com. which goes to a different hosting provider. thx

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• How to setup a simple self-hosted dynamic DNS server

  - by Cerin

  I have a small internal network of physical machines running hypervisors, which in turn run several KVM Ubuntu virtual machines. How would I setup an internal dynamic DNS server so that when I run a script to create a new virtual machine, that VM could automatically register itself in the DNS server? Bind seems to be the standard DNS server for Linux, but it seems designed for a much more "static" DNS model. Dynamically updating this would require a complicated script that would have to SSH into the DNS server, edit configuration files, and then restart the server. This doesn't seem like a very elegant solution. Are there better options? I saw a similar question, although they're asking for a solution for a public setting on Amazon. My servers are entirely private, and I don't want to rely on an external VM host or Dynamic DNS provider.

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• Why do strace/truss sometimes 'fix' stuck processes?

  - by Emmel

  Sometimes you have a stuck process that's been stuck for a while, and as soon as you go to poke at it with strace/truss just to see what's going on, it gets magically unstuck and continues to run! So from merely 'observing' these programs have some impact in the running of the stuck programs .. what's happening here? Did strace (I guess via ptrace(2)?) send a signal, causing the program to cease blocking, or such? I've seen this several times -- most recently on Linux RHEL 4 (and a Perl script mucking with processes and doing some network IO in that case), but in a few other contexts as well. Unfortunately, I can't reproduce this, as it times to happen ... in times of crisis. But my curiosity remains. :-) Any elucidation appreciated.

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• Is Centos legal?

  - by Jim B

  I'm trying to figure out if centos is legal (or simply grey). Here's what makes me wonder: They seem to go to great pains not to mention that they are based on redhat in the FAQ they mention a policy about using the redhat trademark, but the link no longer exists. When installing it it's not hard to find a lot of redhat code. I don't bother much with the linux world anymore but I had a client that was wondering about it as his auditors picked up on it and wanted to know where his license was.

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• Ubuntu to Ubuntu VNC over SSH tunnel

  - by rxt

  I have a Linux Ubuntu desktop at home, ssh enabled, vnc server installed, router rule configured. It all works, and at home I can connect via the local network from my Mac. From the outside I can login via ssh. I've configured putty as follows: session: host name and port number connection ssh tunnel: forwarded ports: L5900|192.168.0.23 the local address is: 192.168.1.45 When I make the connection I can login to the remote machine. Then I open Remote Desktop Viewer. I click connect protocol: vnc host: ? use host as ssh tunnel: ? I don't know what to use for the last two options. Which ip-addresses should I use?

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• Symlink - Permission Denied

  - by John Smith

  I'm facing an interesting problem with plenty of Permission Denied outputs when using SymLinks Linux: Slackware 13.1 Directory with Symlink: root@Tower:/var/lib# ls -lah drwxr-xr-x 8 root root 0 2012-12-02 20:09 ./ drwxr-xr-x 15 root root 0 2012-12-01 21:06 ../ lrwxrwxrwx 1 ntop ntop 21 2012-12-02 20:09 ntop - /mnt/user/media/ntop6/ Symlinked Directory: root@Tower:/mnt/user/media# ls -lah drwxrwx--- 1 nobody users 1.4K 2012-12-02 19:28 ./ drwxrwx--- 1 nobody users 128 2012-11-18 16:06 ../ drwxrwxrwx 1 ntop ntop 320 2012-12-02 20:22 ntop6/ What I have done: I have used chown -h ntop:ntop on the ntop directory in /var/lib Just to be sure, I have chmod 777 to both directories Permission denied actions: root@Tower:/var/lib# sudo -u ntop mkdir /var/lib/ntop/test mkdir: cannot create directory `/var/lib/ntop/test': Permission denied Any ideas?

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• "Target the specific user you will be using and assign it user id 0/group 0"

  - by Jeremy Holovacs

  I am trying to virtualize an Ubuntu machine using VMWare vCenter Converter, but ran into permissions issues. I followed the instructions of part 1 and 2 on this page but when I got to "For Ubuntu operating systems further configuration is needed" I started running into trouble. I'm decent at Linux, but I'm not an experienced sysadmin. How do I Target the specific user you will be using and assign it user id 0/group 0? How do I Ensure that you also still enable Allow root to ssh even though you are not using the root account? Thanks for your help.

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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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