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• Unix LVM: how to resize root lvm

  - by Hussein Sabbagh

  I took over a virtual server at work after a co-worker left. He, however, setup the server incorrectly at multiple stages and im cleaning them up as I run into them... Currently I realized that the file system is broken in half onto 2 logical volumes both at 50gb. One is mounted as the root directory and the other as the /home directory. Saddly, the server has taken up 46gb of the root lv and i need to expand it. I have already shrunk and remounted the home lv. I resized the root lv, but I can't figure out how to unmount the root directory while the computer is on. Obviously this needs to be done before I can finalize the expansion, but I don't know how. I'd appreciate any help or pointing in the right direction. Thanks in advance. PS this is on a CentOS server.

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• Good book for a software developer doing part-time (Linux) system administration work

  - by Tony Meyer

  In many smaller organisations, developers often end up doing some system administration work (for obvious reasons). A lot of the time, they have great developer skills, but few system administration skills (perhaps all self-taught), and so have to learn as they go, which is fairly inefficient. Are there canonical (or simply great) books that would help in this situation? More advanced than just using a shell (presumably a developer can do that), but not aimed at someone that hopes to spend many years doing this work. Ideally, something fairly generic (although specific to a distribution would be OK), covering databases, networking, general maintenance, etc, not just one specific task. For the most part, I'm interested in shell-based work (i.e. no GUI installed), although if there's something outstanding I'm missing, please point it out. (As an analogy, replace "system administration" with C, and I'd want K&R, with C++ and I'd want Meyers' "Effective C++").

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• iis not listening on port 80

  - by user57467

  We have server 2003 and ISA 2004 with IIS 6 on same machnie. Everything worked well till yesterday, when we try to make some new rule in ISA..but this is a long story... Unfortunatelly something happend with our intranet site. Our site is on the port 80, but if we try to open on this client machines then we got and error page (which error page is our provider): 403-forbidden; Remote host not listening, the remote host is not prepared to acceppt the connection request. On the server i can open the site with port 80. If i change the port number in the iis and try to open the site with the port, then works well. I try to shut down IIS and start apache with a simple page. On the server works well but in clients the problem is the same, so i think this is not an IIS related problem. In the ISA we have a web pub rule, with port 80, no auth. Im pulling out my hair, please help. after uninstall and reinstall ISA, de sites work well, till i configure the upstream proxy in the conf/network/web chaining menu and then everything went same... So something wrong with the web-proxy / upstream function... (all my http request forward to my upstream proxy). That was the set long time ago...but a few day ago somehing went wrong... I think maybee our ISP spoiled something..tomorrow i try to figure out... But one more thing: I make a new rule before the default rule in the conf/network/web chaining menu. Every request go to the server not redirected.. Redirect to upstream server.... So if the request goes to our server (our site) then handled locally, and if not then go to upstream proxy and voilllaaa....i tougth... But unfortunatelly: our website work well, but internet work extreamly slowly..:( Maybee with single adapter i can made this? I have to handle all request locally or i have to send all to upstream? I cant filter it?

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• Program for drawing with pen tablet, like Salman Khan's one.

  - by Halst

  Hi, I do a lot of sketching with my pen-tablet. I use MS Paint in Windows 7, and it is just perfect except for anti-aliasing. I found some videos of Salman Khan, where his sketching is really smooth and anti-aliased. Do you know what program he might use? You can see a bit of its interface here: http://www.khanacademy.org/press/chronicle.html and some more: http:/www.khanacademy.org/ http:/khanexercises.appspot.com/video?v=GW8ZPjGlk24 Else, you can recommend me something else. I hope to find something like MS Paint in Windows 7, but anti-aliased, or whatever. PS. Sorry for awkward links - newbies are allowed only 1 link per post

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• Error starting nginx and passenger 3 for Rails app on Suse Linux

  - by thesis

  I have configured passenger on SuSe Linux using simple configuration procedure (calling passenger command and then installing all libraries wich are needed), but now it throws an error.. Is there any solutions how to fix it? test@linux-p1g4:~/test_app/myapp> passenger start *** ERROR *** Could not start Passenger Nginx core: [alert]: could not open error log file: open() "/tmp/passenger-standalone.22737/logs/error.log" failed (2: No such file or directory) [alert]: Unable to start the Phusion Passenger watchdog because its executable (/var/lib/passenger-standalone/3.0.2-x86_64-ruby1.8.7-linux-gcc4.5.0-1002/suppor t/agents/PassengerWatchdog) does not exist. This probably means that your Phusion Passenger installation is broken or incomplete, or that your 'passenger_root' directive is set to the wrong value. Please reinstall Phusion Passenger or fix your 'passenger_root' directive, whichever is applicable. (-1: Unknown error 18446744073709551615) Stopping web server... done

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• aliasing "git" ssh login to "gitolite"

  - by Randal Schwartz

  I'm installing gitolite from CentOS packages for my client. The package creates a gitolite user, which will be visible explicitly during a "git clone" operations. The client wants to use "git" and not "gitolite", in case we change to something more fancy later. I'm not very familiar with CentOS, so I don't want to try to build the package myself from source. I'm wondering if there's a way to do one of the following: Trick sshd into treating "git" as "gitolite". Somehow "alias" a new git username to be the same in all ways as the existing gitolite username (perhaps through some complex combinations of useradd). Rename the "gitolite" username to "git" without upsetting later yum update operations Something else that I hadn't thought of I'd appreciate detailed instructions or pointers.

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• Free web based FTP storage

  - by asksuperuser

  Is there something equivalent to WebDrive but free or open source?

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• MySQL, replacing &nbsp; with... nothing (delete those, please!)

  - by javipas

  I'm trying to purge my WordPress content from "false" carriage return (CR). These are caused after a migration of my content, that now presents from time to time a &nbsp; code that makes the web rendering engine to "paint" a CR where I would like to be nothing. The paragraphs seem to have a double CR because of this, and look too far apart. I'd like to be able to make a MySQL query in order to get rid of that strings, but at the moment I haven't found the key. What I've tried is UPDATE wp_posts set post_content = replace (post_content,'&nbsp;',' '); But i get <p> </p> where before were the &nbsp; strings. This seems not the answer at all. Could it have to be with the ampersand, and in that case, should I use something like &amp;nbsp; or something similar?

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• Why would Firefox not be able to visit Google anymore?

  - by Edward Tanguay

  Lately I've noticed that my Firefox Browser was taking a long time when I would search Google, e.g. 3 seconds before I would see any results. If I search for a three-word phrase, it just hangs trying to connect: I removed all add-ons but it still does this. I thought it might be something with my router, but Chrome, Safari, Opera and Internet Explorer all work fine. Bing works fine in Firefox. Here's my Firefox version information: Otherwise I can still use Firefox, e.g. I'm using it to post this question, but I do notice that when I browse with it, images are often "broken" for a split second before they appear, as if it is having a hard time pulling them from a remote server. Other browsers don't do this. What could be causing Firefox to hang when searching Google?

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• CakePHP: trouble configuring .htaccess for user directories enabled server

  - by bullettime

  I've placed the CakePHP files in a directory in /home/user/public_html/cakephp. When I try to reach localhost/~user/cakephp with my browser, there's an error message. In my case, since I'm using Chrome, it is 'Oops! This link appears to be broken.". Looking for a solution on Google, I found a few articles saying that I have to edit the .htaccess files that came with CakePHP, since it was made to work out of the box in /var/www/htdocs. Apparently I have to add a 'RewriteBase' statement to the .htaccess files. I added 'RewriteBase /' to it but it didn't work. If I change the RewriteBase statement in my user web directory to 'RewriteBase /cakephp' and then try to access localhost/~user/cakephp, the browser then shows not the copy in /home/user/public_html/cakephp but the copy in /var/www/htdocs/cakephp. What can I do to fix this?

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• People Pane in Outlook 2010 doesn't show any emails, or does

  - by Eduardo Molteni

  People Pane in Outlook 2010 either does not show any emails, or only shows some emails for other folders. I've tried re-indexing and recreating the profile, to no avail. I really like the new People Pane in Outlook 2010. Not for the "Social" features, but for finding related emails and attachments. But it just does not work. It is totally broken. Do you know some trick to make it work? Using 32-bit Outlook local version, without Exchange.

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• Getting USB boot to work in SmartOS on HP ProLiant N40L

  - by user126579

  I recently downloaded SmartOS and tried running it on my HP ProLiant N40L, but it always fails on boot. After dd'ing the image to the USB stick, I plug it into the internal USB header and turn the machine on. After selecting from GRUB, it displays the following: , bss=0x0 It sits there for 2-4 minutes, then finally boots the OS and displays the following: WARNING: Couldn't read ACPI SRAT table from BIOS. lgrp support will be limited to one group. SunOS Release 5.11 Version joyent_20120614T184600Z 64-bit Copyright (c) 2010-2012, Joyent Inc. All rights reserved. WARNING: kvm: no hardware support After that, it hangs. I've tried this with two different USB sticks. I've seen some mentions on the SmartOS website about people running it on an N40L, booting from USB, so maybe it's just broken hardware? Has anyone gotten this working?

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• Since updating to today's version of Skype on Win8, Skype won't even log in

  - by Warren P

  I am using the desktop (win32 not appstore) Skype on Windows 8. I accepted an auto-update today which now will not let me log into skype at all. I wiped out the AppData\Roaming\Skype folder because that's how you get Skype back in the past when it has gone stupid, but that didn't help either. I do not get any error message, just the circular progress indicator that lasts forever. (Okay, so far it's been 30 minutes. It may eventually time out yet.) Other ideas please? I tried the Windows 8 App Store Skype app (WinRT), which I hate, I guess I'll go back and install that for now. Update Skype 6.0.126 seems to be completely broken on my Win8 machine.

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• What's required to configure Ubuntu to use a specific DNS server?

  - by ks78

  I've setup two Amazon EC2 instances, both running Ubuntu Server. One is configured as a DNS server running bind9, which will be used to allow EC2 instances to communicate with each other based on hostname rather than IP, since their private IPs may change. I think I have the DNS server setup correctly. I want to use the second EC2 instance to test the DNS server. Using Webmin, I've added the DNS server's private IP to the client's DNS Servers list and added the domain to the Search Domains list. I did have to edit /etc/dhcp3/dhclint.conf to make my changes stick. After reboot, I expected I'd be able to ping or nslookup the DNS server from the test client, but it can't seem to find the server. Is there something I'm missing? What's required to configure an Ubuntu client to use a DNS server? I just want to make sure I'm not missing something before I assume the server's the problem.

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• How to export all wordpress.com post to windows live writer

  - by Ieyasu Sawada

  Is is possible to export existing wordpress post to windows live writer? I have to edit some post and I need to make use of the code snippet plugin that is only available on live writer. There is actually a feature which allows me to do that. But it only allows 1 post at a time. And every time I go to this screen, it always fetches the blog post from wordpress again. Which makes it very slow. What I need is something that will allow me to cache the posts retrieved to make it faster. Or something that will allow me to export wordpress post into live writer documents

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• coordinating a script to run on only one of identical load-balanced servers

  - by Amos Shapira

  I have two identically configured CentOS 5 servers (possibly more in the future). I need to run a cron job on any one of them and that it'll run only on one of them. I know about RedHat Cluster Suite (we use it on other servers), but it's a too big a gun to use for this task, plus it doesn't really behave well for less than three nodes. Is there anything light-weight I can use for that? The servers can communicate with each other directly. I suppose I can develope something over ssh or nrpe (two server which are already installed on these servers), but I was wondering whether there is something already available.

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• IIS7 failover cluster across datacenters

  - by Scott

  Hello, I have servers in two different datacenters with each datacenter getting static IPs. What I would like to do is setup the servers as IIS7 servers and allowing them to failover from datacenter to datacenter with little (or preferably) no interruption. Servers on both sides are running Windows Server 2008 x64 with IIS7 (or 7.5 if needed). I am interested in how to point DNS traffic to the new datacenter without manual human intervention. For example: Datacenter A: IP: 192.168.1.115 Servers: Server 2008 x64 w/ IIS 7 Datacenter B: IP: 192.168.1.220 Servers: Server 2008 x64 w/ IIS 7 Other information: Domain Name: Example.org Domain DNS: 192.168.1.115 If Datacenter A connectivity went down (broken service line, etc.) how does the traffic know to route to Datacenter B on 192.168.1.220? Thanks, Scott

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• Make my git user and apache user have read/write/delete access

  - by Mr A

  I am having permission problems on my server. I use user developer to pull my git repository on the server. Then apache uses its own apache user to do write and execute code. I always have the problems when the app wants to write something in the directory (i.e: log files, and cache ...) if I execute a cron job and it uses my developer rights and wants to add something to the folders that is written by apache. My question is how to have my developer have the same write/delete access as my apache and avoid permission conflicts with each other? I am not fluent on linux command so, it would help if you could provide links or simply examples of doing so. thanks.

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• clone of webdrive but free

  - by asksuperuser

  Is there something equivalent to webdrive but free or opensource ? http://www.webdrive.com/products/webdrive/index.html

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• Make PATH variable changes permanent on openSuse

  - by Marlon

  Okay, so I'm trying to do something that should be rather simple but for some reason I can't quite seem to make it work. All I simply want to do is add a path to the PATH environment variable in openSuse. So far, I've edited the following line in /etc/default/su : PATH=/usr/local/bin:/bin:/usr/bin with this line : PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/php/bin:/usr/local/mysql/bin Basically, all I want to do is have access to php and mysqld regardless of how I log in directly from the command prompt without having to type trailing /usr/local/php/bin/ every time. Am I even editing the right file? I'm a bit of a Linux newbie and to achieve something as trivial as this is eluding me. Server gods out there, drop be a crumb, please? :-)

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• Requiring SSH-key Login Via PAM From Specific IP Ranges

  - by Sean M

  I need to be able to access my server (Ubuntu 8.04 LTS) from remote sites, but I'd like to worry a bit less about password complexity. Thus, I'd like to require that SSH keys be used for login instead of name/password. However, I still have a lot to learn about security, and having already badly broken a test box when I was trying to set this up, I'm acutely aware of the chance of screwing myself while trying to accomplish this. So I have a second goal: I'd like to require that certain IP ranges (e.g. 10.0.0.0/8) may log in with name/password, but everyone else must use an SSH key to log in. How can I satisfy both of these goals? There already exists a very similar question here, but I can't quite figure out how to get to what I want from that information. Current tactic: reading through the PAM documentation (pam_access looks promising) and looking at /etc/ssh/sshd_config.

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• Easy Server Monitoring/Logging point in time solution?

  - by Andre Jay Marcelo-Tanner

  I managed my company's servers and I need to know if load spiked at 3am on the web or mysql server, what processes were active in apache or what queries were going on in mysql at that point in time and maybe any other information that will help me. I know all of that is in log files all over and its literally a PITA to look it all up and correlate data. isnt there 1 solution thats been invented. i know we have pingdom to monitor uptime and responsiveness. like if it has taken 30 seconds to load a page or an error was given by apache or php or mysql to the browser, i want to know that and what mysql processes were running at the time, the apache full status and maybe top output also. stuff like that also would be looking for a SAAS like cloudkick, something i dont have to spend an entire month of work hours setting up when we can pay for something cheaper.

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• DVD-RW Drive not recognizing a DVD+R disc

  - by unknown (yahoo)

  Hi everyone, I am having trouble burning DVD+R disc's. My OS is vista and i have used this burner and these same discs in the past. I haven't had the need to do so in months and now that i come back to create some backups my DVD/RW drive doesn't recognize a brand new DVD+R disc. These disc are the same ones i have used in the past(Same Pack even). Anyone have any idea what this might be. Maybe a vista upgrade or something that i downloaded in the last few months that could have thrown something off? Thanks in advance.

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• How can I expire non-active sessions on my Netscreen SSG140?

  - by David Mackintosh

  I have a Juniper Netscreen SSG-140. While experimenting with a VoIP service, I defined a custom policy that was to be used to permit the possible ports in use to be sent back to the VoIP server from systems connecting across the internet. Because I'd had problems in the past with VoIP systems getting broken when their UDP sessions were expired out faster than their keep-alives were generated, I set the timeout on this custom service to be 'never'. After much experimentation, I happened to notice that my session count on the firewall has grown from a couple thousand to over 36000. After discussion with the VoIP "expert", I set the timeout to be 30 minutes; however, all the sessions set up during the experimentation process are still there, more than 3 days later. Is there a way I can force these old sessions to get expired and removed from the session table, or am I looking at resetting my firewall? (Both firewalls, actually -- they are in a cluster.)

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• Why my computer working without harddisc with livecd, but with hardisk not working - computer not response to any signals?

  - by Yosef

  Hi, History of problem: I formated computer (HP Pavalion Desktop). When I restart computer - computer come to first screen before boot and not response to any signals (f2, f10, ESC, etc..) I take out motherboad battery return after time back and power computer - result : as before I disconnect wires of hard-disk and insert livecd UBUNTU to cd and power coputer: result: works without hard-disk. What is the root of problem: hard-disk broken? hard-disk wires not working well? BIOS? other reason How can I fix the problem?(Buy new hard disk etc...) Thanks, Yosef

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