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• Spam is Killing Me - Can I use GMail as a spam filter?

  - by kirkouimet

  I'm getting at least 50 Viagra ads a day and it's driving me insane. I currently have a hosted MS Exchange account and a Gmail account. My Gmail account forwards to my Exchange account. Both of my addresses are used evenly, and it has been really nice to have all of my e-mail end up in my Exchange box. I like replying from one address consistently, which is my Exchange address. Spam sent to my Gmail address is always caught, where spam sent to my Exchange is getting passed straight through to me. I don't want to have two spam filtration systems that have quarantines that I need to check frequently for false positives. Here is my question: Can I setup my MX records such that all e-mail sent to my Exchange address is forwarded to my Gmail account, which will then forward it to my Exchange account? Kind of like using Gmail as the middle man.

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• Turn off write barriers on ext4 whiche FS is mounted

  - by user462982

  I am doing some IO intensive DB imports that run for several days now and the IO performance has dropped tremendously over times. The DB data files (log files) are on an ext4 formatted logical volume which is mounted with default options (did not specify something special in fstab). Since I just learned that ext4 enables write barriers by default: Q: Is there some way to disable write barriers online (i.e. while the file system is in use), because I cannot interrupt the import and don't want to restart it again. I am aware that write barriers might not be the only thing impeding performance it is a bad idea to have write barriers disabled on journalling file systems if data safty is important (e.g. on a production system)

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• /etc/environment and cron

  - by clorz

  Hi, I've got two machines: Fedora and CentOS. And a cronjob 0-59 * * * * env > /home/me/env.log On CentOS I can see that /etc/environment is affecting the output while on Fedora it does not. I want Fedora to be like CentOS. What do I need to make it happen? /etc/pam.d/crond on Fedora auth sufficient pam_rootok.so auth required pam_env.so auth include system-auth account required pam_access.so account include system-auth session required pam_loginuid.so session include system-auth /etc/pam.d/crond on CentOS auth sufficient pam_env.so auth required pam_rootok.so auth include system-auth account required pam_access.so account include system-auth session required pam_loginuid.so session include system-auth /etc/security/pam_env.conf is the same on both systems and consists of commented out lines. Even if I make /etc/pam.d/cron.d files the same, problem still persists.

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• Squid3 not working. Access denied.

  - by Nitish

  I installed SQUID3 on a Linux machine with two ethernet interfaces (eth0 and eth1). I used the default settings in the squid.conf file and uncommented the two lines acl localnet src 192.168.0.0/16 and http_access allow localnet. eth0 is connected to a router, which provides Internet access. It is assigned an IP 192.168.1.2 by the router. I manually configured eth1 to have an IP address 192.168.5.1. It is connected to a switch. Systems having IP addresses 192.168.5.x are connected to this switch. I ran these two commands for NAT: iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192.168.5.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128 But when I try to access internet from a system having IP 192.168.5.2 through the proxy I get an error that says "Access denied". What is wrong with my configuration?

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• Word document can not open on user's system

  - by Malyadri

  I try to open a word document in my web application. It opens fine on localhost, but now I am publishing my web application on a server. Users that access the published web application (like http://10.0.23.57/StandardOperatingProcedure/Default.aspx) can not open the word document on their system. winword.exe opens on the server but can not open the word document. Access my system to author systems also same problem is coming. (Word document does not open on user's system. The word instance opens on my system.)

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• Does a modern PC require a graphics card to run?

  - by ArtM

  As I can remember, on old systems (Pentium II or III) it was not possible to boot and run the PC if the graphics card was missing (AGP cards were used in those days). Many years from then, I'm using motherboards with integrated graphics and I have no experience related to this subject, the "graphics card" always was present. Currently I intend to build a home/private "server" for my purposes and most of the motherboards I want to buy have no integrated graphics (AMD 870 or 970). I can take a normal graphics card from my firends for a few hours/days and use it when installing the necessary software. The question is: can I boot and run the PC without problems after I install everything I need and the graphics card is removed? if a general answer cannot be given, at least some examples of manufacturers/MB series/MB models will be helpfull I think it's obvious, but for completeness: I mean cheap desktop components, not real servers.

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• not able to make entry of ubuntu 10.04 grub.cfg into redhat 5.1 menu.lst file to run 2 linux os and

  - by Deepak Narwal

  Hello friend... In my computer there are three operating systems.. First i installed Windows 7 then i installed ubuntu 10.04 and in last i installed redhat 5.1 NOw i know one thing as i installed redhat then grub installed by ubuntu will be overwritten by redhat grub..and i know that to see all three operating syetm at the startup i have to make entry of /boot/grub/cfg into /boot/grub/menu.lst file.. Now the problem is like this In te previous version it was very easy to play with ubuntu grub file but now this file is modified..NOw i dont know what is to be picked up from ubuntu /grub/grub.cfg file so that i can make entry in redhat /boot/grub/menu.lst file.. In short i am not able to put entry of grub.cfg file into redhat menu.lst file.. will u help me plz i want to work on these thre eOS..

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• Application deployment with Puppet

  - by michaeltwofish

  I'm new to Puppet and while I've been using *nix systems for many years, I've never worked as a sysadmin or in ops. I'm currently writing Puppet manifests for hosting a set of (PHP/MySQL/MongoDB, code in git) web applications. Clearly Puppet needs to have some knowledge of the actual applications because I'll set up a virtual host for each one, but I'm not sure whether Puppet should be managing things like code deployment and database creation. Is Puppet an appropriate tool for application deployment? If not, can you recommend a more appropriate tool?

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• Expertise Location [closed]

  - by Alexey Shatygin

  Is there some really working implementations of the expertise location systems exist? It is very hard to find anything about it. What sources to use, what to read, where to look? I've started with reading David W. McDonald's, Mark S. Ackerman's overview "Just talk to me" and now need just something more detailed. For those, who voting this question to be closed for off-topic: it is connected to IT sphere, if you don't know what it is - why ever vote? http://en.wikipedia.org/wiki/Expertise_finding http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.40.4654&rep=rep1&type=pdf

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• What is the best resource or method for learning more about servers and networking?

  - by kaleidomedallion

  I can get around a server to some degree, but everything I have learned has been as I have needed to learn it. Every once in a while I will learn about some new command that will revolutionize how I think about systems and networking, and realize how I could have been using it this whole time if only I had known about it. Anything to bring someone from novice to some kind of fluency? Do I just need to earn the battle scars bit by bit over the course of years? (I mean of course I do but what can I do to help it be not quite so painful?) For instance, I am still fuzzy on all of networking. Any help would be greatly appreciated.

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• Simple server status page hosted externally available for users

  - by Chris

  I am looking for any kind of script - can be asp or php or any other web language - that gives me the ability to log outages and the current state of the network for our organisation. This would be similar to any major Telco's "Network Status" page, but I just want to tell the user's out there if the systems are up and running and have a history of recent outages. This would be for our remote user's so they could go to a webpage (externally hosted from our main site) and see that we are currently having problems with our network. What are other people out there using?

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• Unreliable resume from suspend?

  - by dsimcha

  My desktop PC (home-built) resumes from suspend somewhat unreliably. I'd say that it resumes successfully about 85-90% of the time and hangs with a blank screen 5-10% of the time. As far as I can tell, the success or failure of the resume is completely random. I doubt it's a software problem because I triple boot Windows 7, Windows XP and Ubuntu and it's similar under all 3 operating systems. If it matters, my system is overclocked, though other than the resume-from-suspend issue, it's definitely rock stable. What are some of the obvious suspects that would cause random, sporadic failures to resume from suspend?

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• Why is only one domU giving me the "time went backwards"?

  - by Paul Tomblin

  I'm setting up a replacement server for one that was working ok but is having hardware issues. The original server is i686 (Pentium III), but the new one is amd64 (Xeon). Everything is working fine, except one of the three domUs is giving me the "clocksource/0: Time went backwards" error. The Debian Wiki says what to do if all your domUs are getting this error, but not what to do if only one of them has. The "tenants" on my domUs have done some messing about with the systems I configured for them. I don't know what the user of that particular domU might have done.

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• Ubuntu Linux -- create custom burnable/bootable DVD image?

  - by ashgromnies

  I recently developed some kiosk software that runs on Ubuntu Linux, and my client needs me to set up ten more computers with the complete software package(and that number will only grow in the future). So I'm looking for a way to make this less of a pain in the neck and prevent me from shooting myself in the foot -- I had to disable some things on the installations of the operating systems like screensavers, automatic updates, etc. that would pop up and disrupt the kiosk operation. I don't feel comfortable doing that by hand across 10 computers, it seems stupid. Does anybody have recommendations for software that would let me burn an installable DVD with a complete image of the hard drive from one of the devices? I've looked at Clonezilla, G4L, and PartImage and I'm still not quite sure if any of them offer what I need. I know PartImage for sure won't work, because it doesn't support Ext4.

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• Storage replication/mirror over WAN

  - by galitz

  Hello, We are looking at storage replication between two data centers (600km apart) to support an active-passive cluster design for disaster recovery. The OS layer will be mostly Windows Server 2003/2008 with some OpenSuSE Linux used for performance monitoring on VMWare or possibly XenServer. The primary application service to replicate is Nvision. Datacenter 1 will have two storage systems for local active-passive or perhaps active-active replication with Datacenter 2 used as a last resport disaster recovery site. We have a handle on most aspects, but I am looking for specific recommendations on storage platforms that can handle remote replication cleanly. Thanks.

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• Do I have a bad SD card?

  - by User1

  I'm trying to copy data from my computer to an SD card. After a few hundred megs, I keep getting the following errors in dmesg: [34542.836192] end_request: I/O error, dev mmcblk0, sector 855936 [34542.836284] FAT: unable to read inode block for updating (i_pos 13694981) [34542.836306] MMC: killing requests for dead queue [34542.836310] end_request: I/O error, dev mmcblk0, sector 9280 [34542.837035] FAT: unable to read inode block for updating (i_pos 148486) [34542.837062] MMC: killing requests for dead queue [34542.837066] end_request: I/O error, dev mmcblk0, sector 1 [34542.837074] FAT: bread failed in fat_clusters_flush [34542.837085] MMC: killing requests for dead queue These were all files I copied from a smaller SD card. I just want to transfer them to my new, larger card for my phone. I tried the same experiment with different files on a different machine and the card failed again. Reading data from the old card went fine. My systems are older and the new SD card is new (16GB Class 4). Could this be that my computers are too old? Is there a definitive test to verify if my SD card is bad?

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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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• Gnome+NX clipboard behavior; auto-copy on select?

  - by threecheeseopera

  I am having issues with the Gnome(/Linux/Debian+Ubuntu) clipboard when connected remotely; it's default behavior appears to be to automatically add text to a clipboard buffer when that text is selected. This is not usually a problem, until I need to log into one of these systems remotely (w/ GUI), and attempt to use a shared clipboard. If I 'copy' text on the local machine (destined to replace some text on the remote machine), that copy buffer is overwritten as soon as I select the text on the remote machine to be replaced. Is there some way around this? It sort of drives me nuts. Thanks! UPDATE: This is really an NX server issue; X11 supports multiple clipboards ("selections": clipboard, primary. secondary; see this excellent article) that behave differently, and it appears that my problem is related to how NX server translates this over to the host machine.

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• Windows Media Player functionality for Ubuntu

  - by Xeoncross

  I have way to many music files to bother with setting up playlists. Especially since my files locations keeps changing as I move stuff around and swap between different computers, different mount points, and even different Operating Systems! So managing my media with any application is doomed to failure. However, since I still want to listen to the music I usually just select all the files I want to play at a time and then right-click to open them in a media player. Works great in windows media player and places all the tracks in a temp playlist on the sidebar. Fails in ubuntu using Rhythmbox since it doesn't understand "temp" playlists and just keeps adding files to your FULL listing of all sings on your whole computer. I have over three copies of some tracks now in my audio collection - and all of them are now invalid because the location of the files has changed. So what media player (for Ubuntu) works well with just temporary playlists and will allow me to open up my files without adding them to a collection?

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• How to install GRUB command-line tools on OSX?

  - by beakr

  I need access to grub-mkrescue for a project I'm working on. I know that the GRUB command-line tools come builtin to Linux, but how do I get them on OSX? Is there a package? Is it built into the system somewhere? Is there an installer? CLARIFICATION: The question is not about installing GRUB as a bootloader on the Mac. The question is about installing the GRUB command line tools to do things like create bootable disk images of other operating systems.

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• What domain names are served by a host?

  - by pjmorse

  For a set of VPSes operated by my company, I'd like to get a list of domain names hosted by each. The list of names has grown in an ad-hoc way for a few years. Is there a simple way to query the Apache and/or Nginx configurations to see what domains the server answers to on port 80? It is safe to assume (a) that I have sudo on these systems, and (b) they aren't using wildcards, although a solution which acknowledged that a wildcard was in use would be useful too if it also provided a list of explicit domains.

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• xen 4.0 squeeze fails to start guests with: launch_vm: SETVCPUCONTEXT failed

  - by mcr

  As Chris Benninger says over at: http://www.benninger.ca/?p=58 lots and lots of people have the problem with Squeeze and xen4.0 telling them: launch_vm: SETVCPUCONTEXT failed (rc=-1) but nobody seems to know what the solution is. I don't know either, but at least here, a solution might get recorded. In my case, I can start one guest machine. An identical configuration for a second machine fails. Whichever one I start first, is the one that runs, the other gets the error. I've got at least a dozen other systems (at my work) running great with Squeeze and 64-bit XEN, but not this new machine at home.

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• Development environment clean installation

  - by ruigoncalves

  Hi there! I'm about to install a new and clean development environment. To accomplish that, I would like a Windows operating system (possibly Windows 7) and a Ubuntu one (possibly the most recent, 10.04). To allow sharing data between the two operating systems, I'm thinking to create a partition (workspace, for example) with using NTFS to format it and that be automatically mounted by Ubuntu. In terms of the partitioning schema, how would be better to organize the previous mentioned partitions? Thanks in advance, Best regards!

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• SQL 2008 R2 Mirroring Issue

  - by CWL

  Windows 2008 R2 with SQL 2008 R2 - Using Mirroring of a Database across the WAN in a HA setup with one witness. One issue I am having is during a failure (ever so often) the system fails over or tries, but leaves both databases in a Restoring State. My guess is the failover issue happens when there is a WAN bouncing and the systems get confused. The usual fix is to reboot the sql servers. Has anyone seen this type of failure? While this does not happen often it does causes an issue and concern with HA not being trusted fully.

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• Dependency diagramming / mapping tool [closed]

  - by Lars

  I am looking for a tool that allows me to easily create and maintain dependency maps of our mission critical servers, apps, processes, etc. It needs to be intuitive and easy to work with and be able to generate diagrams that clearly show the dependencies graphically. What would be some good tools for this? I have looked at videos for AssetGen Sysmap and BluePrint from Pathwaysystems.com, and they both seem to fit my needs, but there has got to be more good systems like them that I can look at. I want to make sure I pick the best system for our needs (and limited budget).

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