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• How to setup a virtual machine in Ubuntu desktop to run Debian Server

  - by stickman

  I want to run a virtual machine in my Ubuntu desktop that runs a Debian server. The purpose of this is to generate Debian packages. I have some C++ applications that were originally developed on my Ubuntu machine, and I need to (re)compile them on a Debian server in order to: build Deb packages for deployment on a Debian server make sure that the applications will definitely work on a debian server The idea is so that I can do 90% of my development on Ubuntu (where I am more comfortable), and deploy a binary package that definitely works on Debian. BTW, I am developing on Karmic Kola (Ubuntu 9.10). [Edit] Following the advice I got so far, I have installed debootstrap and Debian 'Lenny' on /srv/chroot/debian_lenny on my machine. I am not sure this is the server version, but in any case I dont think that matters for my purposes (though it would be useful to know how to specifically install the server version). At the moment though, I am like a fish out of water, since there is no GUI, and it is only a console that I have in the chroot jail. I had a look in the home folder (I cheated, by using the KNavigator in Ubuntu), and there are no folders there - which presumably mean that no users have been set up as yet in the Debian "system". I would like to know how to do the following: Download and install the dev tools needed for (re)compiling my C++ apps Copy my projects from the Ubuntu "system" to the Debian "system" After building the binaries, I would like to create a debian binary package containing all of my binaries, so that I can install the package on a Debian server (my remote server)

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• Building vs buying a server for an academic lab [closed]

  - by Roy

  I'm looking for advice on the classic build vs buy question. We need a new linux server to run Matlab computation on in our lab (academic). Matlab parallel computing toolbox licence allows up to 12 local workers so we are aiming at a 12 core server with 4GB memory per core (total of 48gb). The system will have an SSD for the OS and a raid-5 (4x2tb) for data. I looked around and found a (relatively) cheap vendor, Silicon Mechanics, that offers a system to our liking (specs below) for $6732. However, buying the components from newegg cost only $4464! The difference is $2268 which is 50% of the base cost. If buying from a company can be thought of as a sort of insurance, basically my premiums are of 50% of the base cost which to me sounds like a lot. Of course any downtime is bad, but the work is not "mission critical", i.e. if it takes a few days to fix it when it breaks its no the end of the world. If it takes weeks to months then its a problem. If it breaks 2-3 times in 3 years, not too bad. If it breaks every month not good. In term of build experience, I set up a linux cluster in grad school (from existing computers) and I build my home pcs but I never built a server before. The server components I'm thinking about: 1 x SUPERMICRO SYS-7046T-6F 4U Tower Server Barebone Dual LGA 1366 Intel 5520 DDR3 1333/1066/800 ($1,050) 12 x Kingston 4GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) ECC Unbuffered Server Memory ($420) 2 x Intel Xeon E5645 Westmere-EP 2.4GHz LGA 1366 80W Six-Core ($1,116) 4 x Seagate Constellation ES 2TB 7200 RPM SATA 6.0Gb/s 3.5" ($1,040) 1 x SAMSUNG Internal DVD Writer Black SATA ($20) 1 x Intel 520 Series 2.5" 180GB SATA III MLC SSD $300 1 x LSI LSI00281 PCI-Express 2.0 x8 MD2 Low profile SATA / SAS MegaRAID SAS 9260CV-4i Controller Card, $695

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• Running Flash on a headless Solaris box

  - by Marty Pitt

  Our build server is a Solaris box, and I'm trying to run a suite of FlexUnit tests as part of the automated build process. This works by compiling a swf movie with a suite of automated unit tests. The build script launches this movie, which automatically begins running the tests. Results of each test are sent back to the launching script across a port, and written out to a local xml file. Once the tests are completed, the movie closes down, and the build script interrogates the results to see if all the tests passed. The FlexUnit wiki provides information about how to to acheive this on a Unix server, by using Xvnc to provide a virtual space for the flash movie to run its tests in. I've provided this information through to our sys admin team, (along with the link to the article), and I've been told that because this is a Solaris box, we can't use that approach - Xvnc isn't supported on Solaris. Unfortunately, I know very little about servers, *nix vs Solaris, or Xvnc. Can someone please provide some advice about how we can achieve the same outcome on a Solaris box?

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• vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

  - by Graphics Noob

  So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "vmmon" device present. When I try running: sudo /etc/init.d/vmware start I get the output: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [FAILED] which shows that the Virtual Machine Monitor fails to load. I tried following the advice on this site and ran vmware-modconfig --console --install-all I notice during the compilation there are no errors, but at the end I get the message: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [ OK ] Unable to start services Out of curiousity I tried: sudo /sbin/insmod /lib/modules/2.6.18-238.9.1.el5xen/misc/vmmod.ko But got the error message: insmod: error inserting 'vmmon.ko': -1 Invalid module format I have a feeling this may be the root of the problem, but I don't know what could be causing it or how to fix it.

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• Struggling with proper way to setup Permissions on Linux/Apache Web Server

  - by Dr. DOT

  Your expert experience and assistance is great, greatly appreciated here. I have been running a LAMP server for a long time, yet I still struggle with the best way to set file & directory permissions for FTP and WWW protocol activity. My Control panel is WHM/cPanel (not that it makes a difference), and out-of-the box: files are owned by the user account setup in WHM (eg, "abc") files have a group setting of "abc" as well file permissions are created with 644 directories are owned by "abc" directories have a group setting of "abc" directories permissions are created with 0755 Again, these are the default permission settings. Now everything is fine with FTP activity, but please advise me if any of these file/directory settings create issues, especially with security. Here's where my struggle comes into play. I have PHP apps that allow a visitor to create, edit, rename, delete, etc. sub-directories and files in certain selected directories. PHP runs as "nobody" on my server. So in order to get my PHP/Web apps to work, I have had to: chown nobody * chgrp nobody * chmod 0777 * to everything in these certain & selected sub-directories. I know this is probably a huge security whole (so don't ask me for any links :) but how should I set all the permissions to allow my FTP user to do his thing while allowing the PHP apps to do their thing will also "minimizing" any security risks and exposures? I know that big CMS systems like Drupal, Joomla, WordPress and so on, handle this. Thanks ahead of time for reading through this and offering your expert advice!

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• Zpool disk failure - Where am I at?

  - by JT.WK

  After checking the status of one of my zpools today, I was faced with the following: root@server: zpool status -v myPool pool: myPool state: ONLINE status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-9P scrub: resilver completed after 3h6m with 0 errors on Tue Sep 28 11:15:11 2010 config: NAME STATE READ WRITE CKSUM myPool ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c6t7d0 ONLINE 0 0 0 c6t8d0 ONLINE 0 0 0 spare ONLINE 0 0 0 c6t9d0 ONLINE 54 0 0 c6t36d0 ONLINE 0 0 0 c6t10d0 ONLINE 0 0 0 c6t11d0 ONLINE 0 0 0 c6t12d0 ONLINE 0 0 0 spares c6t36d0 INUSE currently in use c6t37d0 AVAIL c6t38d0 AVAIL errors: No known data errors From what I can see, c6t9d0 has encountered 54 write errors. It seems as though it has automatically resilvered with the spare disk c6t36d0, which is now currently in use. My question is, where exactly am I at? Yes the 'action' tells me to determine whether or not the disk needs replacing, but is this disk currently still in use? Can I replace / remove it? Any explanation would be much appreciated as I'm quite new to this stuff :) update: After following the advice from C10k Consulting, ie detaching: zpool detach myPool c6t9d0 and adding as a spare: zpool add myPool spare c6t9d0 It appears as though all is well. The new status of my zpool is: root@server: zpool status -v myPool pool: myPool state: ONLINE scrub: resilver completed after 3h6m with 0 errors on Tue Sep 28 11:15:11 2010 config: NAME STATE READ WRITE CKSUM muPool ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c6t7d0 ONLINE 0 0 0 c6t8d0 ONLINE 0 0 0 c6t36d0 ONLINE 0 0 0 c6t10d0 ONLINE 0 0 0 c6t11d0 ONLINE 0 0 0 c6t12d0 ONLINE 0 0 0 spares c6t37d0 AVAIL c6t38d0 AVAIL c6t9d0 AVAIL errors: No known data errors Thanks for your help c10k consulting :)

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• Migrating to AWS Cloud with auto-scaling - where to put Redis and ElasticSearch?

  - by RobMasters

  I've been trying to research this topic but haven't found anywhere that recommends where to install services such as Redis and ElasticSearch when migrating to a cloud framework. I'm currently running a Symfony2 application on 2 static servers - one is running MySQL and the other is the public facing web server, which also has Redis and ElasticSearch running on it. Both of these servers are virtualised, but they're static in terms of not being able to replicate at present (various aspects are still dependent on the local filesystem). The goal is to migrate to AWS and use auto-scaling to be able to spin up and kill web servers as required, but I'm not clear on what I should put on each EC2 instance. Should they be single-responsibility only? i.e. Set up individual instances for the web server(s), Redis, and ElasticSearch and most likely an RDS instance for MySQL and only set up auto-scaling on the web server(s)? I don't foresee having to scale the ElasticSearch server anytime soon as it's only driving the search functionality, but it's possible that Redis may need to be replicated at some point - but should this be done manually? I'm not sure of how this could be done automatically as each instance needs to be configured to know about it's master/slave(s) as far as I know. I'd appreciate advice on this. One more quick question while I'm here - how would I be able to deploy code changes when there are X web servers currently active? I'm using a Capifony deployment script (Symfony2 version of Capistrano), which I think can handle multiple servers easily enough by specifying an array of :domain addresses...but how can should this be handled when the number of web servers can vary?

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• Two hosts on same subnet can't see each other

  - by Joey Hewitt

  I've got two routers with two separate public IP addresses on the same subnet, but I can't get them to talk to each other. Both are connected to the internet (ISP-provided gateway) via Ethernet ports provided by the landlord, but I don't have access to or knowledge of how those are physically connected or the protocols used to get back to the ISP. I can ping either from the outside, but they can't ping each other. Traceroutes in and out look the same, and they receive the same gateway over DHCP. I can ping other IPs on the subnet, so I assume this is not any sort of intentional isolation for security/privacy. Since I'm in a setup where my landlord provides internet and we don't have contact with the ISP, I can't really ask the ISP for help (doubt the landlord would know much either.) The situation is similar to the diagram at this question, but instead of the two servers, there's another router coming off the (presumed) switch, and I don't have access to the switch. I've tried giving them static routes to each other with the ISP internet gateway as the gateway, but that's not working. One is a Linksys WRT54GL running DD-WRT, the other is a Netgear WGR614v7, although I could get something more capable if necessary. I'd like to keep them each connected directly to the ISP on their WAN ports, but I can have an ethernet cable between them if necessary - I'm wondering if there's a way without that, and if there isn't, I'd appreciate advice on how to get that working. Sorry this is so nitpicky; there are reasons for all the constraints, but they don't apply to the real question, so I left them out. ;) Thank you!

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• tmpreaper, --protect and a non-root user

  - by nsg

  Hi, I'm a little confused. I have a download directory that I want to remove all files older then 30 days with tmpreaper. Just one problem, the directory in question is a separate partition with a lost+found directory, of course I need to keep it so I added --protect 'lost+found', the problem is that tmpreaper outputs: error: chdir() to directory 'lost+found' (inode 11) failed: Permission denied (PID 30604) Back from recursing down `lost+found'. Entry matching `--protect' pattern skipped. `lost+found' I have tried with other pattern like lost* and so on... I'm running tmpreaper as a non-root user because there is no reason for superuser privileges because I own all files (except lost+found). Are I'm forced to run tmpreaper as root? Or are my shell-skills not as good as I thought? I guess the problem is: tmpreaper will chdir(2) into each of the directories you've specified for cleanup, and check for files matching the <shell_pattern> there. It then builds a list of them, and uses that to protect them from removal. Any thought and/or advice? Edit: The command I'm trying to run is something like $ /usr/sbin/tmpreaper -t --protect 'lost+found' 30d /mydir 1> /dev/null error: chdir() to directory `lost+found' (inode 11) failed: Permission denied Edit 2: I read the source code for tmpreaper-1.6.13 and found this if (safe_chdir (dirname)) exit(1); and if (chdir (dirname)) { message (LOG_ERROR, "chdir() to directory `%s' (inode %lu) failed: %s\n", dirname, (u_long) sb1.st_ino, strerror (errno)); return 1; } So it seems tmpreaper needs to be able to chdir in to all directories, ignored or not. I see two options left Run tmpreaper as root Move the download directory Find a alternative tool (tmpwatch?) I will give it some more research before i make a choice.

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• iptables -- OK, **now** am I doing it right?

  - by Agvorth

  This is a follow up to a previous question where I asked whether my iptables config is correct. CentOS 5.3 system. Intended result: block everything except ping, ssh, Apache, and SSL. Based on xenoterracide's advice and the other responses to the question (thanks guys), I created this script: # Establish a clean slate iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -F # Flush all rules iptables -X # Delete all chains # Disable routing. Drop packets if they reach the end of the chain. iptables -P FORWARD DROP # Drop all packets with a bad state iptables -A INPUT -m state --state INVALID -j DROP # Accept any packets that have something to do with ones we've sent on outbound iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # Accept any packets coming or going on localhost (this can be very important) iptables -A INPUT -i lo -j ACCEPT # Accept ICMP iptables -A INPUT -p icmp -j ACCEPT # Allow ssh iptables -A INPUT -p tcp --dport 22 -j ACCEPT # Allow httpd iptables -A INPUT -p tcp --dport 80 -j ACCEPT # Allow SSL iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Block all other traffic iptables -A INPUT -j DROP Now when I list the rules I get... # iptables -L -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- any any anywhere anywhere state INVALID 9 612 ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT all -- lo any anywhere anywhere 0 0 ACCEPT icmp -- any any anywhere anywhere 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:ssh 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:http 0 0 ACCEPT tcp -- any any anywhere anywhere tcp dpt:https 0 0 DROP all -- any any anywhere anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 5 packets, 644 bytes) pkts bytes target prot opt in out source destination I ran it and I can still log in, so that's good. Anyone notice anything major out of wack?

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• How to install Windows 7 on a MacBook with HDDs and no optical drive, without rEFIt

  - by user1238528

  I just removed the SuperDrive on my MacBook Pro and replaced it with an SSD. So now my laptop has a SSD, and a HDD, but no optical drive. I have Lion on the SSD and I want to install Windows 7 on the HDD. Unfortunately, Boot Camp only will install Windows off of the Windows DVD. I have made a bootable Windows 7 thumb drive but my MacBook Pro won’t boot off it. So my question is how can I install Windows on the other HDD? I have thought about maybe using Oracle VirtualBox to install it on that hard drive, but I don’t know if that would allow me to boot directly into Windows. I really don't want to go down the whole virtualization route. I know I could just take out the SSD, put back in the optical drive, run the Windows 7 DVD, take the optical drive back out, put the SSD back in. But that sounds like a nightmare. Also, I really don’t want to use things like rEFIt. Any advice?

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• How can something relevant to graphics completely kill a motherboard?

  - by leladax

  I was coding something in OpenGL and after a bug there was an 'OS slowed down' situation. After a few seconds the screen went blank and the laptop shutdown. Now not even a led turns on battery or not. It doesn't appear to be the AC or the battery since there was some battery when it died and when it's connected to the AC the laptop produces near the AC connection a very slight 'clicking' noise (very faint, one has to be very careful to notice it, I don't know if it was there forever tbh). I suspect the motherboard died, as in something from the point it gets AC or battery power and the point it actually feeds itself. But I can't figure out how that effect was produced by the OpenGL bug or graphics overheating. If the graphics died alone, it should at least give some indication that the laptop is barely alive, at least a led, a sound, anything, the laptop is instead completely dead (other than faint 'clicking' I mentioned). Does anyone have expert advice on this? I'm especially interested in any ideas connected to "graphics overheated/bugged ---- they killed motherboard". I have a very lengthy experience in that stuff as a hobbyist and it really puzzles me. It's not just a "AC died" situation I can easily google.

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• Choose a VPN software on CentOs 6.5

  - by loyCossou

  We are installing a SMS gateway with Kannel, on a CentOs 6.5 server, which is supposed to connect via SMPP to our local operators. Kannel is working fine and no probleme there. Now 2 operators are asking to connect via a VPN for obvious security reasons; actually they asked for or VPN details so they can connect to it... Now, I am looking for a free VPN that I can setup and configure on our server... I saw Open VPN that I already started configuring, no issue... But just saw on Wikipedia (http://en.wikipedia.org/wiki/OpenVPN#Platforms) that OpenVPN is not compatible with other VPN packages. Now my question is: 1- I am absolutely new to VPN technologies. Is OpenVPN a good choice in my situation? 2- If I configure OpenVPN on my server, will it be possible to any client to connect to my server? 3- Anyone have any advice for me? Thank you for this great community.

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• Users and Groups management on 7 Home Premium

  - by AviD

  Recently upgraded the home pc from XP pro, to Windows 7 Home Premium. I'm looking for a solution for a few things that seem to be missing from this edition... Since Local Users and Groups is blocked on Home Premium, I can't figure out how to manage groups, or even do anything even slightly advanced to users (basically, create/group/picture is it). net localgroup, net users, net etc dont seem to work - getting "system error 5". While I'm on the topic, I cant activate (what was once) "Local Security Policy"... Looking for any help, advice, or even a new direction cuz things is differ'nt on Winnows7... To clarify, I'm looking to do some of the following, which were simply back in XP-land: remote user only (i.e. no local logon) Grant special privileges for specific user grant access to e.g. C$ share for specific remote user create custom groups for users, to be able to separate privileges of say, my wife's from my kids define quite specifically what each user can do (beyond just standard users) Harden OS (hmm, i guess maybe what i'm looking for is security hardening guide for 7...?)

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• is a wildcard SSL the only option in this multiple VHOST/1IP setup?

  - by solsol

  I have a web app set up that needs the following SSL encryption: secure.myapp.com -> SSL www.myapp.com/login -> SSL www.myapp.com/signup -> SSL If I'm correct, I could run one SSL certificate for my whole www.myapp.com/* pages. The problem is that I have a subdomain called secure.myapp.com that either needs to be on a separate IP address to work with SSL. Right now I have one server, one public IP and a number of Virtual Hosts in apache to make this work. I'd rather not buy an expensive Wildcard SSL certificate to secure just one subdomain. What is your advice on this? If it IS the only solution any tips on getting a price worthy wildcard SSL cert is appreciated. I have read about SNI that allows the use of multiple SSL certs, but not all browsers (IE6!) support this. Since we are building a web app for the public, we cannot have IE6 to run on unencrypted connections. Thanks for you help

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• Client unable to access OWA website after temporarily changing SSL certificate on the server

  - by Lorenz Meyer

  I have the following issue: One client computer (Windows XP) cannot access the OWA website. All other client computers can (Except another one in the same remote office). How this happened: I temporarily changed the SSL certificate on the Exchange Server yesterday. After a few minutes, I reverted back, an now the same certificate that was installed for years is back again. During these few minutes, they were in OWA on this computer and got a certificate error. What exactly happens: Internet Explorer displays the error Internet Explorer cannot display the webpage, Firefox displays The connection was reset and Crome shows This webpage is not available. The connection to ... was interrupted. What I already did to try to get this working: Restart the client computer Restart the exchange server Deleted Internet Explorer browsing history In IE, Internet Options, tab Content, under Certificates deletes SSL cache Restored Internet Explorer to the default parameters I looked into certmgr.msc, but did not find a certificate related to the issue What could I do else to narrow down the origin of this problem (or better: resolve it) ? Can you give any advice ?

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• IPTABLE & IP-routed netwok solution for HOST net and VM's subnet

  - by Daniel

  I've got ProxmoxVE2.1 ruled KVM node on Debian and bunch of VM's guests machine. That is how my networking looks like: # network interface settings auto lo iface lo inet loopback # device: eth0 auto eth0 iface eth0 inet static address 175.219.59.209 gateway 175.219.59.193 netmask 255.255.255.224 post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp And I've got two working subnet solution auto vmbr0 iface vmbr0 inet static address 10.10.0.1 netmask 255.255.0.0 bridge_ports none bridge_stp off bridge_fd 0 post-up ip route add 10.10.0.1/24 dev vmbr0 This way I can reach internet, to resolve outside hosts, update and download everything I need but can't reach one guest VM out of any other VM's inside my network. The second solution allows me to communicate between VM's: auto vmbr1 iface vmbr1 inet static address 10.10.0.1 netmask 255.255.255.0 bridge_ports none bridge_stp off bridge_fd 0 post-up echo 1 > /proc/sys/net/ipv4/ip_forward post-up iptables -t nat -A POSTROUTING -s '10.10.0.0/24' -o vmbr1 -j MASQUERADE post-down iptables -t nat -D POSTROUTING -s '10.10.0.0/24' -o vmbr1 -j MASQUERADE I can even NAT internal addresses: -t nat -I PREROUTING -p tcp --dport 789 -j DNAT --to-destination 10.10.0.220:345 My inexperienced mind is ready to double VM's net adapters: one for the first solution and another - for second (with slightly different adresses) but I'm pretty sure that it's a dumb way to resolve the problem and everything can be resolved via iptables/ip route rules that I can't create. I've tried a dozen of "wizard manuals" and "howto's" to mix both solution but without success. Looking for an advice (and good reading links for networking begginers).

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• What games work well on MacBook Pro (i7/GeForce GT 330M) within VMWare Fusion?

  - by webworm

  I have a 15" MacBook Pro (2.66 i7 with 8 GB RAM) with the GeForce GT 330M 512 MB graphics card. I use it primarily for development (Mac/Web/Windows) though I would like to play the occasional game with my son who uses a desktop PC system at home. I prefer to use VMWare Fusion for virtualization rather than BootCamp for a number of reasons. Heat/Fan issues with i7 under BootCamp Prefer to retain virtual machine as single file rather than dedicated partition (easier to move a nd backup) I have heard that Windows support of the GeForce GT 330 in BootCamp is not all that good. So that being said I was wondering what sort of games I would be able to play within the Fusion environment running Windows 7. I have 8 GB RAM and usually dedicate 4 GB to the virtual machine. I don't expect to be able to play the latest FPS games such as BattleField: Bad Company 2 or Call of Duty, rather I am looking at games such a Total War II, Civilizations IV, Supreme Commander, and other RTS type games. I should mention the native screen resolution of my MacBook Pro is 1680x1050, which is what I would be most likely running the VM at (fullscreen). Thank you for any advice.

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• Unable to connect to server after a certain amount of time

  - by Troy

  I am a business FIOS subscriber with 5 static IPs. I have the following network setup: Verizon provided ONT Dlink switch Dell server running Ubuntu 12.04 with iptables enabled and a static IP address. The makes/models of hardware are: FIOS ONT Alcatel-Lucent I-211M-H ONT D-Link D-Link Web Smart Switch DES-1228P Server Dell Optiplex 755 (Ubuntu 12.04 Server) I have iptables running on the server with http, https and ssh ports open. I can connect to a website on the server from an external computer, but after a certain amount of time (mins to hours), I can no longer connect. All I have to do to re-enable connectivity is connect to the server via SSH from a computer INSIDE the network. I don't have to actually login, I just have to establish a connection. I can then access the website externally again. I did some googling and it seems some of verizon's equipment had an ARP bug where the ARP entries would expire after a certain time period, but those issues all seem to be from back in 2009 - 2010. I know the switch has an 'auto learning Mac address' feature, but I'm not sure if that could be the problem or not. Does anyone have any ideas or advice on how I can troubleshoot this? Thanks!

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• connecting to server with multiple nics in other vlan

  - by Thierry

  I have a windows 2003 server with 3 nics on 3 vlan's (this is in domain 1). nic 1 has a default gateway to my router/firewall (sonicwall). In nic 2 and 3 I have left it empty, because it is advised like that everywhere. Within this domain and VLAN's 1-3 everything works fine. BUT... I have a second domain (domain 2) with a 4th Vlan (all 4 VLAN's connected to the same router/firewall) from which my clients need to access the 2003 server in domain 1 (it's my antivirus management console for both domains). when i ping the server from my vlan4 by it's FQDN, it randomly chooses ip from nic 1, 2 or 3 from my 2003 server. (logically because that server is know in DNS with it's 3 IP-addresses. And that is needed for my VLAN's 1-3) I don't really have a problem with that. BUT, I only get an answer of NIC1 (which sounds logically to me, because it's the only one with a gateway). It is not a router problem, because I'm testing in this phase and ping from vlan4 to any machine in vlan1, 2 or 3 that has 1 nic works just fine. If i add a gateway to nic2 and nic3, I get answer from all 3 nics and this works fine. But I know it's adviced to not do that. Can anyone give me advice in this particular case? Would it really be a problem to add a gateway to nic 2 and 3? They would be pointing to the same router/firewall (only with different ip-address, based on the vlan). Or is there another good solution to fix this problem? Thank's in advance, Thierry.

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• How to manage unprivileged administration of system services using Debian?

  - by ypnos

  At our lab, we have several services handled by different phd students (like myself). Fluctuation is high and people do the job next to their research duties. Until now, services were running on different machines, with different OS setups that can result in administration hell quickly. We want to consolidate our service setup. Our main idea is that the guys responsible for the services should not meddle with the underlying system anymore. Apart from core systems like NFS and kerberos, a typical service is able to run as non-root already. I'm talking about apache, mysql, subversion, mail with openxchange, and so on. Redirecting privileged ports is also no issue (source). What is left is the configuration of the service and its payload. One scenario we envisioned is that every service has its own user and home directory, accessable by the corresponding admins. Backup and fallback of the service is easy, as everything needed for the service to run is found in one place. Are there established ways to create such a setup? Does a mostly unique method exist to make services find their files (other than in system directories) while still using the corresponding debian packages? Are there any catches with our idea that we may have overlooked? Would you maybe claim that virtualization is the answer to our problem? (In our POV, it wouldn't help us keeping system setup strictly separated from service setup.) Thank you for any advice!

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• How to backup a large FreeNAS?

  - by Ze'ev

  We have a 12TB FreeNAS box in the office, and are looking for a way to keep a backup of it offsite. We're considering (1) tape; (2) a bunch of bare drives (popped into a spare hotswap bay); (3) external drives. Any advice on which solution is best? (Online backup is not an option because our internet connection is too slow.) And, is there some software that will keep track of which files have been backed up and which haven't? So that when one backup unit fills up, we can continue the backup on the next? (We don't want to have to back up to a 12TB device.) This software could run, preferably, on the NAS itself; or from one of our Mac clients. Our goal is a situation where we attach some backup device; it automatically fills up with stuff from the server; the contents of this unit are catalogued somewhere something prompts us to replace with a fresh drive/tape; backup continues until full, including any files that have changed since being backed up.

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• Sending email with exim and external sender address

  - by Tronic

  hi. i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you!

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• Desktop Provisioning for a Small Linux Software Development Team

  - by deakblue

  Goal: Get a small team using a standard development image rather than 4 software devs setting up their own environments. Why: it takes a day or days to install a distro, build-specific libraries, tools like editors and IDEs, mysql, couchdb, java, maven, python, android-sdk, etc. It's a giant PITA that when repeated 4 times by 4 developers (not sys admins) wastes time and generates annoying divergences that crop up later (it-builds-on-my-box syndrome). There's no sharing of productivity, settings, tricks, scripts, set-ups. Some of this is helped by segregating the build systems into headless virtualbox images. This doesn't really address tooling though or the GUI-desktop dev that needs doing. So I see three basic strategies, ghosting, virtualization, and finally creating a kind of in-house linux distro (I guess Google does something like this). The target dev environment is based on Debian OpenBox and must allow a mix of 3rd gen Core i7 notebooks 8GB-minimum to work both single and multihead. Important, the lappies are not the same, but a mix of 2012 macbooks and PCs. So: virtualization: is doing all of your work within a VM, like VirtualBox, practical on this hardware or annoying. ghosting: will laptops from different manufacturers make this impractical. DIY distro: short of scripting a bunch of package installs, I don't know if there's any "distro-maker" that could keep this from being an epic project of scripting package installs. So any advice?

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• Performance decrease in every game and application

  - by Márk Vincze

  When I start a game, initially it runs smoothly, but after a couple of minutes, the performance gradually decreases to the point of being unplayable (1-2 FPS). The sound also starts to lag at this point. This does not happen every time I start my PC, usually exiting the game, rebooting, then starting the game again solves the problem, and I can play with perfect FPS for as long as I want. I could not find any deterministic reason when this happens and when doesn't. It happens in every game I tried (SWTOR, Diablo 3, Skyrim), and not even games, but simple applications like a browser or the Control Panel can get unusably slow. This is a brand new PC I bought three months ago, and this problem occurs since the first day I've been using it. Could you provide any advice how to further diagnose the problem? I tried to reinstall Windows, and tried different video card drivers, but it did not help. It would be important to know whether this is a hardware or software problem, because I can use the warranty if it is a hardware issue. (I did not want to return the PC yet, because I can't reproduce the issue deterministically.) Spec of the pc: Motherboard: ASROCK H61M-HVS CPU: INTEL Core i3-2120 3.30GHz 1155 BOX Memory: KINGMAX 4096MB DDR3 1333MHz KIT Video card: GIGABYTE GV-R685OC-1GD HD6850 1GB GDDR5 PCIE HDD: SEAGATE 500GB Barracuda 7200rpm 16MB SATA3 ST500DM002 I am using Windows 7 64 bit. Thanks a lot in advance!

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