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• How to move Mdadm RAID drive (EBS based) to different AWS Instance

  - by Stanley

  We have a media-rich web application that is hosted on AWS. We have several Web Servers and we have an NFS server. On the NFS server (Linux server) we have several EBS volumes that are mounted and we've used mdadm to implement the different mounted volumes as a single RAID volume. The Web Servers simply access the NFS storage through a mount point. Amazon has now let us know that they will be performing power maintenance on this server in a couple of days time. Since all our media is on here it would render our site unusable for the hours while Amazon is working on it. We want to try and prevent this downtime. I was thinking that we can prevent server downtime by perhaps setting up a new server temporarily and attaching the EBS drives (raid volume) to that server and have our web servers point there during maintenance. This is a very high risk operation since this involves several terabytes of our production data. What would be the safe way to move over our logical raid drive (md0) to a new amazon instance? I was hoping that I could start with building the new server, mounting the ebs volumes and assembling the RAID partition using mdadm --assemble --scan before unmounting from the existing instance so that I can first test that everything works and thus having it mounted on two instances at the same time, but I don't believe that is possible with the way that filesystems work. How do I move a Linux software RAID to a new machine? suggests a way to move drives, but isn't really a cloud-based question. Perhaps there are simpler ways to prevent system downtime with our solution being hosted on the cloud? I have considered taking an EBS snapshot, but that tries to replicate all the many terabytes of mounted storage, so this is not a practical solution. Any ideas?

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• Gmail undo yellow notification area disappears too rapidly on Chrome

  - by stephf0716

  I'm having trouble with the Gmail yellow notification area disappearing too quickly in Google Chrome. For reference, I am talking about the notification that appears at the top of Gmail after archiving or deleting a message from a web browser. I tried it on IE9 and it works fine. I have also cleared the cache and cookies on Chrome and the issue persists. Has anybody run into this on Chrome and know of a solution?

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• How to print a rendered website to pdf or vector graphics?

  - by Lo Sauer

  This is a crucial question to many: Searching the web, I have found several command line tools that allow you to convert a HTML-document to a PDF-document, however they all seem to use their own, and rather incomplete rendering engine, resulting in poor quality How can you print the rendered output of a modern web-browser to pdf, (and/or svg) whilst retaining as much vector graphics as possible? There is a solution called: webkit-pdf (which renders everything to bitmap graphics) I am looking for options, alternatives, suggestions perhaps even a printer-driver or webservices? Thanks

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• firefox restarting problem

  - by Arun

  i'm using firefox 3.0.13 in ubuntu 8.10 and i got a problem that it suddenly disables back,forward,refresh,stop options.After updating firefox using following commands sudo apt-get update sudo apt-get install firefox it always ask me restart the browser new version found . how to fix it ? How to reinstall properly?

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• autologin on webpage?

  - by blackjack

  hi i need to type in my username and pass to connect to internet through a captive portal provided by my isp is there a automatic way(any software/script) to type in info(in username and pass fields) and login without me typing and pressing that %$^& login button every time on my browser(chrome)?

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• Google Reader - How do I increase the size of the text in the reading pane?

  - by Chris Ballance

  This may be either something obvious I have missed not not possible. I'd rather not have to adjust the size of the text in my browser. Any way to do this? Something to size the text as I can do with Readability would be ideal

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• Looking for a host based network monitor solution

  - by Ole Martin Handeland

  Hi all! Problem So, my hosting company has a network usage graph for my dedicated server. It seems that one day earlier this month, my network usage suddenly spiked with several hundred megabytes transferred (usually it's in the tens, not hundreds). It was probably me, but i just can't be sure who or what it was. Question So my question is; does anyone know of any host based solution for monitoring network usage that would tell me the client's IP-address, the port/service he/she used? What I don't want I'm just guessing that someone will suggest i use nagios, munin, zabbix, cacti, mrtg - I've also looked at those, but a graph over network usage will not give me the answers I'm looking for. :-) Almost there I've already looked at a lot of monitoring solutions, and I've tried [ntop][http://www.ntop.org/], [darkstat][http://unix4lyfe.org/darkstat/] and others. Darkstat just didn't give me the answers. Although it listed a lot of statistics, and i could list the clients - it doesn't show me the network usage for a particular period. Ntop is by far the best I've seen so far - but i think it mostly shows current network usage, not the historical part. I could run apt-get upgrade and download a whole bunch of software, but not see it in the log afterwards.

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• Solution for secure online remote presentation?

  - by Greg Joshner

  Hello, what is your (subscription free) solution to share a presentation with a number of users (below 50) that works without plug-ins in a browser and allows the presentation to be centrally controlled (and thus prevents participating users from "flipping forward")? I won't need print, save as or offline features, just showing and controlling a presentation centrally. Thanks a lot for your help!

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• How to setup NTFS ACL with Acces Based Enumeration

  - by Patrick Pellegrino

  We're in the process of migrating from Novell Netware to Windows 2K8 R2 infrastructure (AD, File server, print server... etc) My question is about ACL. While Netware and Windows are totally different, I want to be sure my thnking is good before screwing everything up! There's a scenario : F: | +-- DATA <= Shared as DATA with Access based enumeration | +-- Folder 1 +-- Team 1's Folder +-- Team 2's Folder ... In that case, by default, rights are herited from the F: to the deepest folders. What we want : Administrators group have full control top - down. From DATA, ABE list only folders that users have access. (ex. : I'm in group Team 2, I see Team 2's Folder). From what I understand, at DATA I remove all NTFS ACL to be herited (ex. Users Group), be sure to keep Administrators Group and SYSTEM user. After that, grant Full control (or any right needed) on each folder to Groups or Users that have to have access. Does I'm wrong ? Anything I should take care of ? Any help to my understanding will be very appreciated. Regards.

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• trouble shooting ntfs-loop-xen combination in wubi based grub of Ubuntu

  - by Registered User

  Here is a situation I installed Ubuntu on a laptop using Wubi in Windows 7 drive.*The laptop is not mine.*I have installed and things worked by now perfectly without any problem.We are trying to set up a Xen (virtualization)environment in this laptop. After setting up every thing cleanly.When I needed to boot with following grub entries menuentry "Xen Linux 2.6.32.27" { insmod ntfs set root='(hd0,2)' loopback loop0 /ubuntu/disks/root.disk set root=(loop0) multiboot /boot/xen.gz module /boot/vmlinuz-2.6.32.27 dummy=dummy root=/dev/sda2 loop=/ubuntu/disks/root.disk ro console=tty0 module /boot/initrd.img-2.6.32.27 } I got error file not found error unknown command 'multiboot' error unknown command 'module' error unknown command 'module' Now to dig this issue further I reboot the machine and go to grub command prompt and manually pass on each of the above parameters which you see in the grub entry when I reached grub> insmod multiboot then I got following message on screen error:file not found. It looks like this wubi+ grub setup has just enough modules to use loopback file on ntfs, but the ACTUAL /boot directory is on the loopback NOT ntfs (hd0,2). Therefore any attempt to read any files from (hd0,2) simply wont work, cause there's no file there.I need to use insmod multiboot and command multiboot and module which are available in grub on a normal install without Wubi.But since the laptop is not mine so I am not allowed to partition it and have to make it work in this situation only. While a normal Kernel is still booting? How can I get module multiboot in this Wubi based install.

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• Setting cfengine3 class based on command output

  - by gnomie

  This question is very similar to How can I use the output of a command in cfengine3 but the answer does not apply in my case I believe. I want to update a git repository via "git pull" and based on whether that lead to changes trigger some follow up action. Simplified, if there was something like "match output and set class" via some body if_output_matches I would want to use something like this: bundle agent updateRepo { commands: "/usr/bin/git pull" contain => setuidgiddir_sh("$(globals.user)","$(globals.group)","$(target)"), classes => if_output_matches("Already up-to-date.","no_update"); reports: no_update:: "nothing updated"; } body contain setuidgiddir_sh(owner,group,folder) { exec_owner => "$(owner)"; exec_group => "$(group)"; useshell => "true"; chdir => "$(folder)"; } So, is it possible to use the output of a - possibly expensive command - and base some decision on that? The execresult function is no good choice for me as a) the pull may become expensive at times (not recommended following the cfengine3 reference) and b) does not allow to specify user, group, working dir - which is important in my case. The repository is in user space and not owned by root.

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• How can I make Google Chrome display a plain text HTTP response, rather than downloading it in a fil

  - by ttIla

  There's a web site I visit that includes a document which is returned with content type text/plain and my version of Google Chrome used to display it in the browser window, as plain text. I like it that way. However, it has started to download the document now when I visit it, instead, meaning I have to open it with a text editor to view it. How can I make Chrome return to the old behaviour?

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• Firefox or IE crashes when I try to print

  - by Vidar

  When I try to print a web page in either IE or Firefox - it just crashes? Any ideas? Printer works with other applications fine - like Word etc. It's only browser related for some strange reason. I am running XP SP3 - the printer is a Canon Laser Shot LBP 1120

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• Unicode support between different OS and browsers

  - by Martin Trigaux

  I would like to develop a web application that uses unicode. The problem is that I don't know if the user supports or not the full unicode set. First question : is the unicode support depends on the browser or the operating system ? Second question : how well main browsers/OS behave ? To goal is to find big subsets of mainly supported unicode characters (with the fact that I accept to not support old tech) Thank you

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• Looking for a tool to expand shortened urls

  - by Rich Seller

  The interwebs seem to be infested with shortened urls (Twitter I'm looking at you). I'm always reluctant to click these as it is a leap into the unknown. Are there any browser plugins or Greasemonkey scripts that will auto-expand the shortened URL or give me a tooltip with the resolved target? I've seen LongUrl.org, which has an API I could use to roll my own, but I'd like to avoid the effort if this is a solved problem.

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• How to get Google Chrome on my TV for under $100

  - by pattern86

  How can I get the Google Chrome web browser on my TV for under $100? ($200 MAX) I have a TV with HDMI and component inputs (but no bluetooth so firmware modding is out.) I want the solution to work with bluetooth peripherals--I already have a wireless Apple keyboard and Magic Mouse. I don't want a laptop or a desktop computer, unless it's in the general form factor of an HTPC or Mac Mini. Is there a way to make this happen?

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• Make Excel 2007 open hyperlinks in Firefox

  - by skypecakes

  In Excel 2007, when I click a hyperlink, it opens in IE. I'm running XP Professional SP3. Firefox is set as my default browser. Links in Word and Outlook open in Firefox. But Excel opens them in IE. Anyone know how to fix it? Edit: Process Explorer shows the command line for IE to be "C:\Program Files\Internet Explorer\IEXPLORE.EXE" -Embedding Thanks!

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• apache adress based access control

  - by stijn

  I have an apache instance serving different locations, eg https://host.com/jira https://host.com/svn https://host.com/websvn https://host.com/phpmyadmin Each of these has access control rules based on ip adres/hostname. Some of them use the same configuration though, so I have to repeat the same rules each time: Order Deny,Allow Deny from All Allow from 10.35 myhome.com mycollegueshome.com Is there a way to make these reusable so that I don't have to change each instance everytime something changes? Ie, can I write this once, then use it for a couple of locations? Using SetEnvIf maybe? It would be nice if I could do something like this pseudo-config: <myaccessrule> Order Deny,Allow Deny from All Allow from 10.35 myhome.com mycollegueshome.com </myaccessrule> <Proxy /jira*> AccessRule = myaccessrule </Proxy> <Location /svn> AccessRule = myaccessrule </Location> <Directory /websvn> AccessRule = myaccessrule </Directory>

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• Need help finding a program to split PDFs based on text in specific areas

  - by Sean

  I reeeeally need help with this. I work for a University in the admissions office and we get large PDFs of every document that an applicant uploads to us. What I need to do is split these PDFs into separate documents. Each of the separate documents has a head at the top of what type of document it is (Statement of Purpose, Transcript, etc). I found a program a few weeks ago that at first seemed to work great (A-PDF Splitter). It would look for every type of document in a combined PDF (eg. Statement of Purpose), and if it saw that heading it would create a new PDF named "ORIGINALFILENAME-Statement of Purpose". I soon discovered though that the program breaks for no reason on certain PDFs, and I have to take the time to take that PDF out of the queue and start the splitting over again (and we get 250 a day). I contacted their support and they basically told me I was SOL. So please, if you can find me a program to split PDFs into smaller PDFs based on if it finds particular text in a region, then I would be forever in dept to you. If I don't find one soon then I'm going to be spending the entire day splitting PDFs by hand and my boss isn't going to be happy.

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

  - by SteveCB

  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. However, the plugin relies upon the existence of: /dev/megaraid_sas_ioctl_node This device node doesn't exist by default, you have to create it by hand using something like: mknod /dev/megaraid_sas_ioctl_node c 253 0 Now, to make the existence of this device node persistent across reboots, I thought I could write a udev rule, but as usual, I'm missing something. I thought I could create a file such as /etc/udev/rules.d/10-local/rules that contained: DRIVER=="megasas" NAME="megaraid_sas_ioctl_node" MODE="0600" But this doesn't work - no device node after a reboot. Dmesg output indicates the megasas driver is loaded and functional: megasas: 00.00.04.01-RH1 Thu July 10 09:41:51 PST 2008 megasas: 0x1000:0x0060:0x1028:0x1f0c: bus 1:slot 0:func 0 megasas: FW now in Ready state Further, I don't see any means to instruct udev on which type of device node to create: character or block. I suspect I'm failing to understand exactly how udev is meant to work. I realise I could just cheat and run MegaCLI in /etc/rc.local, redirecting output to /dev/null; it creates the megaraid_sas_ioctl_node device node as part of its execution. I just thought using udev rules would be a) cleaner and b) a useful learning exercise. Perhaps I should just dump the above mknod command in /etc/rc.local... So how do I get udev to create the /dev/megaraid_sas_ioctl_node device node based on the presence of the megasas driver? Cheers Steve

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• Lazarus Form Recovery for Safari?

  - by Cawas

  I use Lazarus a lot on Chrome and FireFox. Well, not a lot, but it's great for crashing when you're writing something online in a form that doesn't automatically save what you're writing. Plus, this should be default in every browser ANYway, and not built-in any web site (such as gmail). So, is there any such option for Safari? Does Saft do that? Just by looking at the home page, it seems to me like bloatware to Safari 4.

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• Best console based text editor not only for programmers [closed]

  - by robo

  I need console based text editor for writing both source codes and human readable texts such as emails. I need it to be user friendly. It mean for me: You can use it the same way as the notepad or gedit. You can use mouse there. If you need your mother of girlfriend or somebody to edit your text they will know what to do, they will not realize it is a console and will have only a feeling it is something like a notepad. copy, paste, undo works as usual with usual key combinations (Ctrl-C, Ctrl-V, Ctrl-Z). shift and arrows works as usual. They select the text. And when I return to the computer I want to use the text editor for programming. I expect: Syntax highliting auto indenting replacing spaces with tabs keyboard shortcuts for compiling possibility to configure it to use a debugger autocompletions for c#, java, c++ and other languages other things I expect from IDE's. I was working and configuring vim for a few years. But It never fulfilled all of my expectations (but it almost did). I thing I could get vim configured perfectly if I had few more weeks time for configurating it. Unfortunately I cannot afford to be configuring vim forever. Is there other alternative? Hopefully some editor I once set up and it will works forever? What do you use? I often hear people are using emacs. Is it worth learning?

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• Linux port-based routing using iptables/ip route

  - by user42055

  I have the following setup: 192.168.0.4 192.168.0.6 192.168.0.1 +-----------+ +---------+ +----------+ |WORKSTATION|------| LINUX |------| GATEWAY | +-----------+ +---------+ +----------+ 192.168.150.10 | 192.168.150.9 +---------+ | VPN | +---------+ 192.168.150.1 WORKSTATION has a default route of 192.168.0.6 LINUX has a default route of 192.168.0.1 I am trying to use the gateway as the default route, but route port 80 traffic via the VPN. Based on what I read at http://www.linuxhorizon.ro/iproute2.html I have tried this: echo "1 VPN" >> /etc/iproute2/rt_tables sysctl net.ipv4.conf.eth0.rp_filter = 0 sysctl net.ipv4.conf.tun0.rp_filter = 0 sysctl net.ipv4.conf.all.rp_filter = 0 iptables -A PREROUTING -t mangle -i eth0 -p tcp --dport 80 -j MARK --set-mark 0x1 ip route add default via 192.168.150.9 dev tun0 table VPN ip rule add from all fwmark 0x1 table VPN When I run "tcpdump -i eth0 port 80" on LINUX, and open a webpage on WORKSTATION, I don't see the traffic go through LINUX at all. When I run a ping from WORKSTATION, I get this back from some packets: 92 bytes from 192.168.0.6: Redirect Host(New addr: 192.168.0.1) Vr HL TOS Len ID Flg off TTL Pro cks Src Dst 4 5 00 0054 de91 0 0000 3f 01 4ed3 192.168.0.4 139.134.2.18 Is this why my routing is not working ? Do I need to put GATEWAY and LINUX on different subnets to prevent WORKSTATION being redirected to GATEWAY ? Do I need to use NAT at all, or can I do this with routing alone (which is what I want) ?

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• Denying access to website via htaccess based on http header

  - by neekster

  I've been trying for ages to get this to work and I can't put my finger on it. What I'm trying to do is block access to a site from a number of countries, based on the CF-IPCountry header added by CloudFlare. I figured htaccess was a suitable way to do this. We are running LiteSpeed 4.2.4 on top of DirectAdmin for a control panel. The problem we having is the htaccess rule doesn't seem to do anything. Here's the rule we tried: SetEnvIf CF-IPCountry AU UnwantedCountry=1 Order allow,deny Deny from env=UnwantedCountry Allow from all That makes no difference at all, connections are still accepted. Just to check that the rule was at least being processed, I changed Allow from all to Deny from all, and connections were refused. So it appears to be a problem wit the variable. Here's the relevant headers that come in with the request. Connection: Keep-Alive Accept-Encoding: gzip CF-Connecting-IP: xx.xx.xx.xx CF-IPCountry: AU X-Forwarded-For: xx.xx.xx.xx.xx CF-RAY: c9062956e2d04b6 X-Forwarded-Proto: http CF-Visitor: {"scheme":"http"} Zone-Name: xx.com.au Hopefully someone can help me out, this has been driving me nuts for too long. Thanks

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• In a Shell scripts, check version of installed package, make a decision based on output

  - by DJDarkViper

  Looking to write a cross distro / cross version shell script that makes sure a forced version of PHP is installed Example: Ubuntu 12.04 has 5.3, Ubuntu 13.10 has 5.5, Debian 7 has 5.4 I need this script, when run on a distro that has an old version of PHP, to update the repo to point to a package for 5.4, and if the distro has too new of a version, can downgrade to 5.4 appropriately. Im still not entirely comprehensive of Shell/Terminals technical limit of what you can do with it, but ill be perfectly frank that im still not totally used to existing tools The best I can think at the moment is: php -v | grep "PHP 5" but that returns a bunch of potentially changeable granular characters (PHP 5.4.4-14+deb7u5 (cli) (built: Oct 3 2013 09:24:58) ). Im not sure what to pipe to after this to extract out the characters im interested in Im not sure if im being totally clear, im not sure how to ask this.. Basically, in an automated shell script for Linux distros, how do I extract the PHP version (and just the PHP version number preferably) and make a decision based on that output EDIT This line ended up doing pretty dang good php -v | grep "PHP 5" | sed 's/.*PHP \([^-]*\).*/\1/' | cut -c 1-3 Bit long in the tooth, but gives me "5.3", "5.4", and "5.5" which is exactly what I need to work with

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