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  • Large file copy from NFS to local disk performance drop

    - by Bernhard
    I'm trying to copy a 200GB file from an NFS mount to a local disk. The local disk is an XFS filesystem on a LVM on top of a RAID 5 system (hardware RAID controler). I'm using rsync to monitor the transfer speed. At the beginning the IO speed is about 200MB/s, stable for the first 18GB. But then the performance drops by a factor of 10-20 and never recovers to the initial rate. Sometimes it reaches about 50-100MB/s but just for a few seconds and then the process seems to hang for a bit. At the same time all file-stat operations on the target filesystem are blocking for a long time (minutes). Also interrupting the copy process blocks for several minutes, a sub-sequent delete of the partly copied file takes also several minutes. Any ideas what could be causing this?

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  • Why won't apache load a symlinked file from conf.d?

    - by kdt
    I have an apache configuration file which works fine when it's placed directly in /etc/httpd/conf.d/foo.conf. However, when I move the same file somewhere else (for example, move it to /tmp/foo.conf) and then create a symlink with ln -s /tmp/foo.conf /etc/httpd/conf.d then apache fails on startup with: httpd: could not open document config file /etc/httpd/conf.d/foo.conf I've tried making the file and the symlink mode 777, and tried changing them to be owned by the apache user. It seems like apache is failing to load the file purely on the basis of it being a symlink, but I'm sure I've used symlinks successfully on other machines. Is there something I'm missing? Does apache have an option for refusing to load config files if they're symlinks? The operating system is CentOS 4.4, apache version 2.0.52.

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  • VPN on a ubuntu server limited to certain ips

    - by Hultner
    I got an server running Ubuntu Server 9.10 and I need access to it and other parts of my network sometimes when not at home. There's two places I need to access the VPN from. One of the places to an static IP and the other got an dynamic but with DynDNS setup so I can always get the current IP if I want to. Now when it comes to servers people call me kinda paranoid but security is always my number one priority and I never like to allow access to the server outside the network therefor I have two things I have to have on this VPN. One it shouldn't be accessiable from any other IP then these 2 and two it has to use a very secure key so it will be virtually impossible to bruteforce even from the said IP´s. I have no experience what so ever in setting up VPNs, I have used SSH tunneling but never an actuall VPN. So what would be the best, most stable, safest and performance effiecent way to set this up on a Ubuntu Server? Is it possible or should I just set up some kind of SSH Tunnel instead? Thanks on beforehand for answers.

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  • How can I get Gnome-Do to open in multiple X Screens?

    - by btelles
    Hi, I LOVE Gnome-Do (the Ubuntu version of QuickSilver). The only thing is that I have several monitors, which are all completely separate X Screens (I.E. I can't move windows between them), and Gnome-Do will only open in ONE of those monitors. If I go to Monitor/Screen #2 and press Super+Space, the Gnome-Do window appears in the first monitor. Is it possible to get a separate Instance of Gnome-Do on each Screen? P.S. Using profiles may be a work-around...I've managed to get multiple instances of Firefox by using "firefox -P my_first_screen"...anything like that available in Gnome-do?

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  • Fedora 15: em1 recently dissapeared and hostapd no longer serves internet to wirelessly connected devices

    - by Daniel K
    I have a laptop running hostapd, phpd, and mysql. This laptop uses an Ethernet connection to connect to the internet and acts as a wireless access point for my workplace's wifi devices. After installing some software and reconnecting my Ethernet elsewhere, my "em1" device is no longer present and wirelessly connected devices can no longer reach the internet. The software I recently installed is: pptp, pptpd, and updated some fedora libraries. I have also recently moved my desk and laptop to another location and thus had to reconnect the Ethernet elsewhere. Wifi devices no longer have access to the internet. Wirelessly connected devices are able to successfully log into the laptop, showing full strength, correct SSID, and uses the proper password. However, when I tried to connect to a site like google, the request times out. The device "em1" also no longer appears on my machine. Running: # ifup em1 will give me the following output: ERROR : [/etc/sysconfig/network-scripts/ifup-eth] Device em1 does not seem to be present, delaying initialization. And running: # dhclient em1 has the following output: Cannot find device "em1" When I run # dmesg|grep renamed, I get the following: renamed network interface eth0 to p4p1. I've tried to connect to the internet through p4p1 directly from the laptop and was successful. However, my wireless devices connected to my laptop are not able to connect to the internet. I have uninstalled pptp and pptpd using # yum erase ... but the problem still persists. To install pptp I used: # yum install pptp To install pptpd I did the following: # rpm -Uvh http://poptop.sourceforge.net/yum/stable/fc15/pptp-release-current.noarch.rpm # yum install pptpd To update my fedora libraries I used: # yum check-update # yum update EDIT: Running # route produces the following results: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.11.200.1 0.0.0.0 UG 0 0 0 p4p1 10.11.200.0 * 255.255.252.0 U 0 0 0 p4p1 172.16.100.0 * 255.255.255.0 U 0 0 0 wlan0

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  • La préversion du pilote ODBC SQL Server pour Linux disponible, avec des outils pour SQLCMD et pour importer et exporter des données

    La préversion du pilote ODBC SQL Server pour Linux disponible avec des outils pour importer, exporter des données et exécuter des requêtes et scripts Comme l'avait annoncé Microsoft lors de son salon Pass Summit 2011, la préversion (CTP1) de son pilote ODBC (Open Database Connectity) SQL Server pour les systèmes d'exploitation Linux est disponible. Ce driver devrait permettre aux développeurs C et C++ de se connecter à SQL Server à partir des plateformes Linux et fournir un mécanisme pour que les applications et bibliothèques d'exécution (runtimes) puissent accéder à SQL Server. Pour l'instant, cett...

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  • how're routing tables populated?

    - by Robbie Mckennie
    i've been reading "tcp/ip illustrated" and i started reading about ip forwarding. all about how you can receive a datagram and work out where to send it next based on the desination ip and your routing table. but what confused me is how (in a home network setting) the table itself is populated. is there a lower layer protocol at work here? does it come along with dhcp? or is it simply based on the ip address and netmask of each interface? i do know (from other books) that in the early days of ethernet one had to set up routing tables by hand, but i know i didn't do that.

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  • A short but intense GCC Gathering in London

    - by user817571
    About one week ago I joined in London many long time GCC friends and acquaintances for a gathering organized by Google (in particular I guess should be thanked Diego and Ian). Only a weekend, and I wasn't able to attend on Sunday morning, but a very good occasion to raise some issues in a very relaxed way, in particular those at the border between areas of competence, which are the most difficult to discuss during the normal work days. If you are interested in a general overview and some notes this is a good link: http://gcc.gnu.org/wiki/GCCGathering2011 As you may easily guess, the third topic is mine, which I managed to have up quite early on Friday morning thanks to the votes of some good friends like Dodji (the ordering of the topics resulted from democratic voting on Friday evening!). I learned a lot from the discussion: for example that certainly the new C++11 'final' should be exploited largely in the c++ front-end; the various reasons why devirtualization can be quite trick (but I'm really confident that Martin and Honza are going to make a good progress also basing on a set of short testcases which I promised to collect); that, as explained by Ian, the gold linker already implements the nice --icf (Identical Code Folding) facility, which some friends of mine are definitely going to like (however, see: http://sourceware.org/bugzilla/show_bug.cgi?id=12919). I also enjoyed the observations made by Lawrence, where he remarked that in C+11 we are going to see more pointer iterations implicitly produced by the new range-based for-loop and we really want to make sure the loop optimizers are able to deal with those as well as loops explicitly using a counter. All in all, I really hope we are going to do it again!

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  • password protect a VPS account?

    - by Camran
    I ordered a VPS today, and am about to upload my website. It uses java, mysql, php etc... However, I need to password protect the site at first... I use Ubuntu 9.10 and have installed LAMP just now. How can I easiest do this? Thanks PS: Have problem with the serverfault website, thats why I am posting this here. sorry.

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  • non greedy grep command on ubuntu?

    - by ChrisRamakers
    Hi all, I'm building a script which filters out all our translatables from our template system. the problem i'm facing is the occasion where 2 translatables are on one line. These are 2 example lines from a template file which both hold one or more translatables <img src="/captcha/generate.jpg" alt="[#Captcha#]" /> <span>[#Velden met een * zijn verplicht in te vullen#]</span> <button type="submit" name="frm_submit" class="right">[#Verzend#] And when i set loose the following regexp egrep "\[#(.*)#\]" . -Rohis I get this output [#Captcha#]" [#Velden met een * zijn verplicht in te vullen#]</span> <button type="submit" name="frm_submit" class="right">[#Verzend#] While the desired output is [#Captcha#] [#Velden met een * zijn verplicht in te vullen#] [#Verzend#]

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  • Who keeps removing that file?

    - by mgerdts
    Over the years, I've had many times when some file gets removed and there's no obvious culprit.  With dtrace, it is somewhat easy to figure out:  #! /usr/sbin/dtrace -wqs syscall::unlinkat:entry /cleanpath(copyinstr(arg1)) == "/dev/null"/ {         stop();         printf("%s[%d] stopped before removing /dev/null\n", execname, pid);         system("ptree %d; pstack %d", pid, pid); } That script will stop the process trying to remove /dev/null before it does it.  You can allow it to continue by restarting (unstopping?) the command with prun(1) or killing it with kill -9.  If you want the command to continue automatically after getting the ptree and pstack output, you can add "; prun %d" and another pid argument to the system() call.

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  • How to show a warning message when entering a folder?

    - by Valter Henrique
    I don't know if this is possible, but, I have a folder which I would like to show some warning message when the user enters in it. In my case would say that the folder could be deleted without previous warning to save some disk space. I already create a file inside the folder with the warning message: WARNING! ########################################################################################################################################################## Please, be advised, that the folder /company-backup/amazon-s3 can be deleted without previous WARNING to save disk space as the INFRASTRUCTURE TEAM judge necessary. Best regards, Infrastructure Team. ########################################################################################################################################################### Is that possible ? Any idea ?

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  • Disadvantages of not having a swap partition

    - by Bo Tian
    I recently installed Ubuntu 10.04 on my laptop. Due to space constraint of the SSD, I did not set a swap partition for the OS, and I have 1.5GB of RAM. There's a warning during installation, but I think it's not a big deal since everything went smoothly. For the long term, would there be any drawbacks of not having a swap partition?

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  • How can I port forward with iptables?

    - by stu
    I want connections coming in on ppp0 on port 8001 to route to 192.168.1.200 on eth0 on port 8080 I've got these two rules -A PREROUTING -p tcp -m tcp --dport 8001 -j DNAT --to-destination 192.168.1.200:8080 -A FORWARD -m state -p tcp -d 192.168.1.200 --dport 8080 --state NEW,ESTABLISHED,RELATED -j ACCEPT and it doesn't work, what am I missing?

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  • The State of the Internet -- Retail Edition

    - by David Dorf
    Over at Business Insider, there's a great presentation on the State of the Internet done in the Mary Meeker style.  Its 138 slides so I took the liberty of condensing it down to the 15 slides that directly apply to the retail industry.  However, I strongly recommend looking at the entire deck when you have time.  And while you're at it, Business Insider just launched a retail portal that's dedicated to retail industry content.  Please check it out as well.  My take-aways are below after the slide show. &amp;amp;amp;amp;lt;span id=&amp;amp;amp;amp;quot;XinhaEditingPostion&amp;amp;amp;amp;quot;&amp;amp;amp;amp;gt;&amp;amp;amp;amp;lt;/span&amp;amp;amp;amp;gt; [Source: Business Insider] Here are a few things I took away from the statistics: Facebook and Twitter are in their infancy.  While all retailers should have social programs, search is still the driver and therefore should receive the lions share of investment.  Facebook referrals are up 92% year-over-year, but Google still does 80% of the referrals. E-commerce continues to grow at breakneck speed, but in-store commerce is still king. Stores are not showrooms yet.  And social commerce pure-plays like Gilt and Groupon are tiny but worthy of some attention. There are more smartphones than PCs on the internet, and the disparity will continue to grow. PC growth will be flat and Tablet use will continue to grow. Mobile accounts for 12% of all internet traffic. A quarter of smartphone sales come from China, so anyone with a presence there better have a strong mobile strategy. 38% of people have used their smartphone to make a purchase, and many use their smartphones inside stores.  Smartphones are a critical consumer tool for shopping. Mobile is starting to drive significant traffic to e-commerce sites, especially tablets.  Tablet strategies are crucial for retailers. Mobile payments from the likes of Paypal and Square are growing quickly.  It will be interesting to see how NFC plays in this area. Mobile operating systems are losing market share to iOS and Android.  I wonder in Microsoft can finally make a dent? The internet is being dominated by mobile devices, and retailers had better have a strong mobile strategy to meet consumer demand.

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  • Debian Testing installs Iceweasel ESR (severely outdated)?

    - by Lucas Phillips
    I just reinstalled Debian Testing, and for some reason, instead of Iceweasel 25, I have 17. The installed and candidate versions are both 17.0.9esr-1~deb7u1. apt-get update && apt-get upgrade does nothing, and it seems that version 17 is the latest for this install. I was on Debian Testing before, and Iceweasel was at the latest version. Even Debian Stable had an Iceweasel version 20. Why would it be trying to install ESR now?

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  • Tomato/DD-WRT router to act as switch & only NAT some port

    - by fseto
    BACKGROUND: I have a device that must use a real IP address. Currently, my ISP uses DHCP and I can have up to 4 real IP address assigned. However, the cable modem only have 1 ethernet port and it's connected to my router (running Tomato, but can run DD-wrt or other Openwrt if required). Question stems from how I can connect the additional device, requiring a real IP? EASY SOLUTION: would be to get a switch and connect to the CM, Router, and Device. But alas, I want to avoid this route, since: my wiring cabinet in my home is drawing lots of power and heat already Device will be unprotected by any firewall unable to monitor the traffic to/from device. Besides, what would be the FUN in that? =) IDEA: So what I want to do is to configure the router, so that one of the switchport is removed from the normal br0 bridge. Instead, I want to make it behave like a switch on the WAN port. What's the best way of doing this? Should I create another bridge on the WAN & the device port? Can a single port belongs to two bridges? or would I need to create a subinterface first? Would I need a DHCP-relay? Am I expecting too much from my poor cheapie router? +------+ | CM | +--++--+ || +----WAN---------------+ | / \ Router | | BR1? BR0 | | | \ | | | {NAT} | | | / | | \ | +-P0----P1-P2-P3-Wifi--+ | +------+ |Device| +------+

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  • fstab line for auto mount drive that all users can read/write

    - by evilblender
    I have installed a cable that connects from the CPU's SATA motherboard connection to a removable drives' ESATA connection. I would like to be able to swap drives on the ESATA connection and have all users be able to read and write to these drives. I have created the directory /archive/ where I would like the drive(s) to mount. The drives are all formatted Fat 32 - but in the future I may use HFS for formatting. When I used the command (as root): mount /dev/sdc1 /archive the drive was mounted (but read only) What can I use in my /etc/fstab file that will allow drives to be mounted and unmounted by all users on the system? (both reading and writing) Also, will I be able to mount and unmount these drives without shutting down? or will I need to reboot every time I want to change drives? Thank you. Jeff

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  • File corruption when copying different file on raid 1

    - by Stephan
    I have a RAID 1 configuration of 2 1TB drives on a Fedora 12 box. Most of what is stored there are video files that are numerical labeled. The problem I'm having is that I had one of the video files get corrupted. I copied a replacement from a backup and replaced the bad file and now it works fine. However, after doing this the next numbered file goes from 350MB to 200KB and all but about .5 second of video disappears. If I then replace that file it happens to the next one down the line. Ex: Replace corrupt file 1.avi and file 2.avi shrinks to 200KB. Replace now corrupted 2.avi and it works but 3.avi gets screwed up. I have run SMART tests on the drives and they report fine. Does anyone have any tests I can run to try to figure out what is going on? EDIT: It is a two disk software RAID 1 with an ext4 filesystem

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  • RPM with RHEL: install 2 version of same package / different arch

    - by Nicolas Tourneur
    I think the title is pretty self explanatory :) Is it possible, under RHEL (v 5) to install 2 instances of the same packages with 32 bit support for one and 64 bits support for the other one? Obviously, the running host has a 64 bit kernel and has the compatibility libraries required. (in this case, we would need a 64 bits JDK and a 32 bits one). If yes, are there any special rpm flag to use (change of installation directory for instance)? Thanks in advance,

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  • iptables question

    - by RubyFreak
    i have a small network, with one valid IP and a firewall with 3 network interfaces (LAN, WAN, DMZ). I want to enable PAT on this valid IP to redirect http traffic to a server in my DMZ. (done) I want to enable MASQ on this ip from traffic that comes from my LAN (done) I want from my LAN as well to access my http server at DMZ. (partially) Question: in the above scenario, i cannot from my LAN, to access my http server in the DMZ, since it has the IP used by the MASQ (the only valid ip that i have). What would be the best option to solve this problem? network interfaces: eth0 (WAN) eth1 (DMZ) eth2 (LAN) /sbin/iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE /sbin/iptables -A FORWARD --o eth1 -d 2.2.2.2 -p tcp --dport 80 -j ACCEPT /sbin/iptables -t nat -A PREROUTING -i eth0 -d 1.1.1.1 -p tcp --dport 80 -j DNAT --to 2.2.2.2 /sbin/iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT /sbin/iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT /sbin/iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT

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