Linux is the generic term for a UNIX-like open source operating system based on the Linux kernel.

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120 views

Linux server memory upgrade partially invisible

Yesterday, I replaced two 256MB DIMMs in a server of mine (dating from 2006 or 2007, I think) by two new 1GB DIMMS. I also upgraded the Linux kernel from 2.6.30 to 2.6.35. Now, top and free report I ...
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1answer
86 views

Creating users/groups via PHP

I'm creating an internal tool that needs a bit of cpanel/webmin type functionality, but this isn't a situation where I could use one of those Right now I need to be able to create linux users, ...
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1answer
988 views

SSH to server with xargs

I have a pretty easy problem I'm trying to resolve here. I'm constantly running the (host) command on domains, to get their IPs, then (host) again on those IPs to get their PTRs, then I'm SSHing to ...
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1answer
58 views

Software to drive remote output (audio + video)

I am looking for a way to send my laptop's video and audio outputs to another machine on the network, which is itself connected to a TV and audio amplifier unit. The idea is to be able to switch to ...
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1answer
3k views

How do I replace a disk marked as removed from a linux md raid-5 array?

I had some recent computer issues and somehow one of my disks ended up not being recognized in my array anymore. It identifies fine, and both smart and some other disk checking utils all say its fine, ...
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1answer
159 views

Linux I/O buffering reference

Can someone point me to a fairly complete reference on the Linux I/O system, primarily how all the buffers and caches are handled and flushed? My understanding so far is that there are Application ...
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1answer
115 views

bind9 configuration problem

I just set up a bind9 dns server on a linux machine in my local network, responsible for the "intern" zone. I have two problem left to be solved, however. The first one is the output of dig -t a ...
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1answer
563 views

tcpdump and congestion window

Sniffing http traffic to my (linux) server it seems like it always responds advertising a window size of 14. It isn't affected if I change the default initcwnd size (with ip route), and it doesn't ...
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5answers
437 views

Methods to transfer files from Windows server to linux server

I need to transfer webserver-log-like-files containing periodically from windows production servers in the US to linux servers here in India. The files are ~4 MB in size each and I get about 1 file ...
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1answer
399 views

IPTables SNAT + OpenVPN problem on reboot

I am trying to create a LAN to LAN VPN using OpenVPN and two RHEL5 machines. I have everything working, except that it fails after I reboot the client side(until I restart iptables). The relevant ...
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2answers
5k views

Linux bridge responding to arp on wrong interface?

I'm trying to build a silent bridge for monitoring purpose. My computer is running linux 2.6, brctl 1.4 and has 3 NIC: eth0, with an assigned IP, used for SSH maintenance eth1, and eth2 , the 2 ...
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5answers
2k views

List of debian services

I'm looking for explanation of services installed with debian so i would know which ones i can shut down and which ones are critical. I had no luck in searching the net.
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1answer
293 views

How to install gChartPhp (Google Charts) at CentOS 5 machine

I've copied gChartPhp into /var/www/html on my CentOS 5 Linux machine and it works ok, but I wonder if there is maybe a better way to install and maintain that code. I'm asking this because gChartPhp ...
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1answer
1k views

Using udev to create a character device based on a driver being loaded

I'm in the process of setting up RAID monitoring for a number of Dell servers that use the PERC 6i integrated card. We're using Nagios at present and the check_megasasctl plugin seems to fit the bill. ...
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4answers
1k views

Can I manage Windows 7 machines with an open source server?

Can I manage a small office of Windows machines with an open source solution? (~15 users) (XP Pro, but will be moving to Windows 7 Pro as we get new computers over the next few months... as budget ...
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2answers
761 views

Linux: Invalid TCP Flags

It is often recommended in tutorials and books to filter invalid TCP flags with iptables. I wonder if those aren't already filtered by the kernel itself or the iptables state module. Does anyone have ...
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3answers
632 views

Linux media streaming server?

we need to implement a media/video streaming solution on Linux, a-la youTube but for our internal use. Any decent open source tools for this?
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3answers
5k views

How to integrate RADIUS with Kerberos?

We've got properly configured LDAP+Kerberos on our wired network. Now we want our users to log in to our WiFi network by using their normal credentials. I've found lots of HOWTOS about LDAP+RADIUS ...
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4answers
4k views

Choosing 10GbE switch: 10Gb uplink module on 1GbE switch means it can act at 10Gb bandwidth?

confused between choosing a switch with 10Gb ports vs 1Gb layer3 switch which has optional 10Gb uplink port. are they same? that means I want to have a 10Gb pipe between storage server and the two ...
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2answers
575 views

Migrating the SAN lun in Linux

How to perform LUN migration in Linux (using LVM and native multipath) from one storage device to another storage device
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1answer
306 views

Remote Linux Installation

i will try to install a Linux-System to a remote System where i dont have a Monitor or Keyboard. I can access the machine with ssh. I found following Document that describe a serial connection via ...
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2answers
2k views

Is it possible to use ebtables to filter traffic by MAC-addresses on simple ethernet interface, without bridging?

I have a linux machine (my workstation). From there I can ping other local machines, let's say 192.168.1.22. Let's say I want to prohibit communication with 192.168.1.22 by it's MAC address. I'm ...
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3answers
1k views

Autodetect/mount SDCards and run script for them on Linux

I'm currently running SME Server, and need to have a script run upon the attachment of SD Cards to my server. The script itself works fine (it copies the contents of the cards), but the automounting ...
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1answer
2k views

Upgrading Debian Etch to Lenny stuck on kernel/libc issue

I have a Debian Etch (4.0) system, currently still running kernel 2.4.27-2-386. I'd like to upgrade it to Lenny, but I'm running into what seems to be a circular dependency between the kernel and ...
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1answer
173 views

What Plug Computer to use for a stats screen?

For our office I'd like to build a "screen" that shows realtime statistics of an online game we developed. It'll have graphs, charts, numbers and all that stuff showing full screen, and I'd prefer to ...
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1answer
521 views

Edit stage2.img

I need to edit the stage2.img file to fix a glitch where kickstart wont allow you to select network or hostname options. But I cant for the life of me get the damn thing mounted. mount -o loop,ro -t ...
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5answers
312 views

Monitoring whether a file has been changed on a remote web server

What's the best method for monitoring whether a file has been changed on a remote web servers given the following preconditions? Servers are running different operating system but most are some ...
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2answers
5k views

How do I change a password directly in the PhpBB3 SQL database?

I have inherited a PhpBB3 installation from an uncontactable previous admin who didn't leave me the password, or any mechanism to retrieve it. It runs on a MySQL database, which I have logged into ...
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2answers
106 views

running a command automatically everyday

I want a command to run automatically on my NAS control station which is linux based. nas_pool -size -a to run everyday at 12 AM . I have my Control station IP added to exchange server and getting ...
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2answers
552 views

Advice for IMAP failover to secondary server

I've recently been given the task of configuring an IMAP based e-mail server solution that incorporates failover to a backup server. I have experience in this area, but it's all been single server ...
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1answer
306 views

Memcached failing to get data (nuked by expire)

currently I have three different running memcached instances, each one for an environment (dev, test and live) All three environments are running the same memcached version (1.4.5) and configurations ...
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1answer
133 views

virtual system admin

We are a small team of developers that are developing a bunch of different applications. We are constantly struggling with the server setups and configuration. We are investigating if we need to ...
2
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1answer
3k views

Setup RHEL/CentOS 5 to use SUDO in command line and X

How do I make CentOS/RHEL prompt me for my password (and not roots) when I run a privileged command. I have found many guides that detail how to do this for the command line but I want it to work ...
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2answers
1k views

Migration from Xen to KVM

I have Xen domU virtual machines running Windows. Each of them are installed in their own LVM logical volumes. I want to migrate them to another server with KVM on lvm to. How can I do this faster ...
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5answers
2k views

Creating a 80GB image with dd on a FAT32 drive

I have a question concerning the creation of an drive image with dd. Normally i would simply type: "dd if=/dev/foo of=/dev/bar". But in this case i only have a fat32 formatted drive at hand, which ...
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1answer
92 views

What are some of the pitfalls of reusing a user name in Ubuntu?

First, let me state, this was an IT goof up. They deleted an account, went "oops" and created a new account with the same credentials. I can't fathom why. Regardless, I've got a Linux (Ubuntu ...
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1answer
394 views

Howto getting started with User Mode Linux using rootstrap?

I have Ubuntu 10.10 installed and would like to create some instances of User Mode Linux (UML) using bootstrap, but all information I can find seems out-dated, and my simple attempts fails. Any one ...
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1answer
308 views

Virtualization Hardware and Software Advice; Terminal Services; Active Directory

Here's what I have in mind, understand I am ignorant: A core OS running virtual machine software - Linux (which distro?) with VMWare? A Terminal Services virtual machine for up to 50 thin clients - ...
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3answers
2k views

how to do dos2unix to *.tpl recursively in linux?

Is there such an option so that dos2unix can be applied recursively to matching files ?
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5answers
11k views

How to get pid of just started process

I want to start process (eg. myCommand) and get its pid (to allow to kill it later). I tried ps and filter by name, but I can not distinguish process by names myCommand ps ux | awk ...
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1answer
479 views

How to setup a VPN server that could used for proxy?

I'm using CentOS and Debian. I want to have a VPN server that could be used as proxy server, cos I need that for gaming purpose. I don't want to use OPENVPN, because that needs to install a client ...
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0answers
64 views

IP migration by filtering

I'm looking for a solution to use virtual IPs between 2 hosts, but in a specific way. I would like to have the addresses bound to both hosts at once, but filtered out on the inactive one (arp ...
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4answers
207 views

What Hypervisors support non-homogenous clusters?

I've been using Citrx Xenserver for awhile on a few machines that don't support Hardware Virtualization as a test for various small servers. I recently have been experimenting with moving the PV Vms ...
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3answers
136 views

Determining if a remote linux server has CD drive

I want to find out if there is a CD drive on a remote server running Red Hat Linux release 7.3 (Valhalla). Based on what I can see in fstab, /proc/devices, /proc/ide/ide0/ it seems like there is a CD ...
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5answers
1k views

Is there any browser utility I can use in SSH for Linux

Is there a text-based browser available for Linux (CentsOS) which I can use when I SSH to my server. I use CentOS release 5.5. My server do not have graphic interface. It would be nice if it ...
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3answers
3k views

How to Specify outgoing HELO with sendmail?

How do you specify the FQDN (Host and Domain Name) that a mail server presents itself as in HELO/EHLO when sending outgoing email with sendmail?
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1answer
325 views

Arp tries on various *nix based systems

Does anyone know what determines the amount of arp tries a router will make? I have different behaviors with two devices, if I try to traceroute to a non-existent host on a subnet that belongs to an ...
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2answers
218 views

What are my options for running cross platform NFS in the cloud (AWS), similar to dropbox but without the vendor lock in?

We're using Dropbox but in order to share files >2gb, each sharer must have premium Dropbox account. I resent this pricing model as it is unfair and am resolved to finding a more open solution.
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6answers
481 views

Enterprise grade file sharing

Can anybody suggest any web based application ( enterprise grade) that will allow my internal users to share files with the outside world. Maybe something like yousendit, but I want to be able to host ...
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2answers
151 views

DBD::mysql for bugzilla installation

I was installing bugzilla 3.6.3 i have a dependency for DBD::mysql 4.0 currently DBD::mysql installed on the system is 3.0.This is a centos machine and if any one let me know how to install this ...