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• UEC - Can the Cluster Controller and Storage Controller be seperate systems?

  - by Jeremy Hajek

  My department is implementing an Ubuntu Enterprise Cloud. I have done the testing and am quite comfortable with the 4 pieces, CC/SC, CLC, WS, NC. Looking at various documents below it appears the the Storage Controller and Cluster Controller (eucalyptus-sc and eucalyptus-cc) are always installed on the same system. My question is this: can I install the storage controller and the cluster controller on separate systems? http://open.eucalyptus.com/wiki/EucalyptusAdvanced_v2.0 the picture indicates that cc and sc are two different machines http://www.canonical.com/sites/default/files/active/Whitepaper-UbuntuEnterpriseCloudArchitecture-v1.pdf P.10 1st paragraph uses the word "machine(s)" http://software.intel.com/file/31966 P. 8 indicates the same separate architecture BUT... https://help.ubuntu.com/community/UEC/PackageInstallSeparate indicates below that the SC and CC are to be on the same system.

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• NGINX : Proxy pass intercepting 5xx errors - Possible to differentiate between ones fired by backed vs ones fired by nginx itself?

  - by anonymous-one

  We use proxy_intercept_errors ( http://wiki.nginx.org/HttpProxyModule#proxy_intercept_errors ) with our backends. We intercept a number of status codes, including a few 5xx ones. Our 5xx (each 500 has its own) handler has an access_log so we can see all the 5xx errors returned to the user in a nice clean logged format. The issue with this is that as it stands now, we cannot tell weather a 5xx was returned to the user by nginx or intercepted from our backend. Is there any way to differentiate between the two? Thanks.

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• Restore more than 250 files using DPM 2010 and PowerShell

  - by toryan

  I've got what should be a fairly simple task: restore the following files from DPM: D:\inetpub\wwwroot\*\index.* I followed the instructions in this TechNet wiki and pretty much thought I had it. Unfortunately, the New-SearchOption commandlet can only return 250 results, and this search would generate way more results than that. So actually only the first 250 files were restored, which is no use to anybody. Does anyone know of any way to get around the 250 search results limit? I guess it would be possible to get the subdirectories of D:\inetpub\wwwroot and loop through them in turn, but I kind of want to keep this fairly simple as it is only for this task.

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• Apache Server access log shows another domain's request and got redirected

  - by user3162764

  I found my apache2 access log (debian) includes some entries not related to my domain and got '301' redirection: ,-,-,[19/Aug/2014:10:09:54 +0800],"GET /admin.php HTTP/1.0",301,493,,, ,-,-,[19/Aug/2014:10:09:55 +0800],"GET /administrator/index.php HTTP/1.0",301,521,,, ,-,-,[19/Aug/2014:10:09:55 +0800],"GET /wp-login.php HTTP/1.0",301,499,,, Obviously those requests are not to my domain, but from this source, debian will default deny all proxy request: https://wiki.apache.org/httpd/ClientDeniedByServerConfiguration Besides, I cannot find there is mod_proxy under /etc/apache2/mods-enabled. I am anxious about: 1. is the server acting as open proxy? 2. why http 301 is returned? Thx.

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• How to create a readonly root linux: Can be mounted as writeable for persistent changes?

  - by Mr Anderson

  I'd like a read only file system that runs almost entirely in RAM but the compact flash or hardrive can be mounted and made writeable to make persistent changes. How do I do this on Linux? I've looked at several tutorials but none really explain how to create such a system with the option of being able to mount the storage device and make persistent changes. I looked at this so far: http://chschneider.eu/linux/thin_client/ I also looked on the old gentoo wiki but the article was very specific to Gentoo. I'll be using a debian based Linux but it would be nice I've someone could explain to me how to do this in pretty generic instructions ,that would work on any Linux distro. Thanks.

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• Manual Duplex printing for Mac (and/or Linux)

  - by chris_l

  My printers don't support automatic duplex printing. I'm looking for a solution for my Mac and Linux computers that I've seen with most Windows printer drivers: Check "Manual duplex" in the printer screen Printer starts printing one side A dialog appears, asking me to flip the pages Printer prints the other side. One thing I can do, is print odd pages, then reopen the dialog and print even pages, but this is very inconvenient, especially when I only want to print a certain page range of the document as the Mac dialog forgets my previous page range every time. It gets even more inconvenient, when printing 2-up double sided, or when changing additional settings for this one printout. Is there maybe some tool, that can do this? Or maybe a "virtual printer driver" that can sit somewhere between the dialog and the actual printer driver, which manages these steps? (The Windows tool http://en.wikipedia.org/wiki/FinePrint can do something like that, but I don't need all of its features - and I need it on Mac/Linux) Thanks, Chris

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• WYSIWYG editor for structured text (suitable for SVN versioning)

  - by chris_l

  I'm looking for an open source cross platform WYSIWYG editor that I can use to write documentation. I'm not looking for a web based solution - i.e. it should work without a web server, and I want to save my files directly to disk. The result could be any structured format, like Wiki markup, ReStructuredText, DocBook, or a small subset of HTML, ... But it's important, that Subversion diff can be used to see differences between the versions easily (this wouldn't work with .odt or .rtf files for example) I'm currently thinking about using Open Office, and saving the files as HTML, but is there a better solution?

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• Why is my firewall preventing me from accessing some websites

  - by nosx

  I have an old Belkin router and when I enable the firewall I cannot access certain websites. For example: http://www.avisynth.org With Firewall Enabled: Main page loads and begins to do a meta refresh which never finishes. With Firewall Disabled: Main page loads and the meta refresh completes as normal and I am taken to the wiki page. I have not setup any rules in my firewall that would prevent this site from loading, yet it refuses to load unless I have the firewall disabled completely. My router has a hidden page with advanced settings on it for the firewall which I was able to acccess and take a screenshot of, but I did not want to mess with these values unless I absolutely have to do so: What might be causing this problem and how would I go about fixing it?

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• creating proper vpn tunnel, when both LANs have the same addressing

  - by meta

  I was following this tutorial http://wiki.debian.org/OpenVPN#TLS-enabled_VPN and this one http://users.telenet.be/mydotcom/howto/linux/openvpn.htm to create openvpn connection to my remote LAN. But both examples assumed that both LANs have different addresses (ie 192.168.10.0/24 and 192.168.20.0/24, check out this image i.stack.imgur.com/2eUSm.png). Unfortunately in my case both local and remote lan have 192.168.1.0/24 addresses. I am able to connect directly on the openvpn server (I can ping it and log in with ssh), but I can't see other devices on the remote LAN (not mentioning accessing them via browser which was the point from the first place). And don't know if the addressing issue may be the reason of that? If not - how to define routes, so I could ping other devices in remote LAN?

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• How to Diagnose a Pre-Operating System Load or Hardware Issue

  - by soandos

  How can I find out if my problem is hardware based? If it is, how can I figure out what component is to blame How can I fix other pre-operating system issues? As an aside, what are all of these components responsible for, and if they break, what can go wrong? (This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive, most comprehensive answer possible. Feel free to add your contributions via edits.)

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• Messages released from MailScanner quarantine are marked as DUPLICATEDELIVER in Exchange 2007

  - by kdl

  I have installed Postfix with MailScanner on CentOS 5.4 as a smarthost for Exchange 2007. When a message gets quarantined and I later release it (http://wiki.mailscanner.info/doku.php?id=documentation%3Aconfiguration%3Amta%3Apostfix%3Ahow%5Fto%3Arelease%5Fquarantined%5Fmail), it gets delivered to the Exhcange box but does not appear in a user's mailbox. Exchange message tracking log shows the message is marked as DUPLICATEDELIVER and therefore dropped. How can I work around this situation? Maybe changing a message ID somehow while at the Postfix box or some other way? Thanks.

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• Making a Live Thumb drive boot with Persistent files, settings AND *drivers* that load on boot?

  - by Luke Stanley

  I have seen https://wiki.ubuntu.com/LiveUsbPendrivePersistent but it's a mess. What methods support persistent drivers as well as files and settings and don't screw up lifespan of the flash drive? I'd like to see your personal recommendations on say, Portable Linux, USB Creator, Remastersys + Unetbootin, etc Backstory: I have a Inspiron 1525 that's hard drive has been slowly dying. I want to switch to a live USB/CD/DVD system until I can get it repaired but my laptops internal wifi device requires a network connection by another means for Xubuntu to let it work, and then I have to enter my Wifi key again, and THEN I have to reinstall Skype etc... I'd be damned every time I have to shut the laptop down. I'm ok with making a shell script for installing apps and copying settings as required but a good persistent install should make this old hat and slow and it doesn't take care of drivers. The last time I tried making an ISO with Remastersys it didn't seem to copy all the required settings.

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• does heartbeat v3 support same resource agent types of pacemaker?

  - by Emre He

  As we know, Pacemaker supports three types of Resource Agents, ? LSB Resource Agents, ? OCF Resource Agents, ? legacy Heartbeat Resource Agents http://www.linux-ha.org/wiki/Resource_Agents does heartbeat v3 support above 3 types resource agent? or it only support LSB and legacy heartbeat resource agents? because we have only virtual ip and one service need to switch in ha cluster, so we decide not involve pacemaker, so we come to this question, for example we cannot monitor the application service by heartbeat, heartbeat only can handle to start it on active node. thanks, Emre

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• Free IP address management software

  - by TiFFolk

  We are choosing a system for managing our IP address space. So we are looking for a special free software like IPPlan. So what we have nowadays: Ipplan (Beta IPv6 support) SolarWinds IP address tracker (IPv6 support unknown ) IP module of The NOC Project (BTW, take a look of it, seems to be very promising project) (IPv6 support unknown ) phpIP (Does not support IPv6) IP management from RackTables (Does not support IPv6) Do you know about any other special software, like written above? But: No Wiki No DNS No DHCP No spreadsheet Software should provide: Clear view of available addresses Detail listing of all addresses by subnets/search pattern/owners/additional info It must support adding additional info like owner of IP, domain-name, contacts, etc Multi user support Easy interface Software has to be specially written for address management. Scalability Any OS: win, lin, sol, web

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• Xen 4.0.1 on Ubuntu 10.10 not booting

  - by Disco

  I'm trying to get Xen 4.0.1 run as dom0 on a fresh/clean install of 10.10 desktop (x64). Followed the step by step tutorial at http://wiki.xensource.com/xenwiki/Xen4.0 I have the pvops kernel in /boot, also included the ext4 fs support by recompiling the kernel by : make -j6 linux-2.6-pvops-config CONFIGMODE=menuconfig make -j6 linux-2.6-pvops-build make -j6 linux-2.6-pvops-install Here's my grub entry : menuentry 'Xen4' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod part_msdos insmod ext2 insmod ext3 set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set 2bf3177a-92fd-4196-901a-da8d810b04b4 multiboot /xen-4.0.gz dom0_mem=1024M loglvl=all guest_loglvl=all module /vmlinuz-2.6.32.27 root=UUID=2bf3177a-92fd-4196-901a-da8d810b04b4 ro module /initrd.img-2.6.32.27 } blkid /dev/sda1 gives the : /dev/sda1: UUID="2bf3177a-92fd-4196-901a-da8d810b04b4" TYPE="ext3" My partition shemes is : /boot (ext3) / (ext4) Whatever option i've tried i end up with : mounting none on /dev failed: no such file or directory And message complaining that it cannot find the device with uuid ... It's taking my hairs out, if somone has a clue ...

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• Error in Installing MediaWiki for Ubuntu, Posgres 8.3

  - by Masi

  How can you solve the error message at the last line? .... # Installing MediaWiki with php file extensions # Environment checked. You can install MediaWiki. # Generating configuration file... # Database type: PostgreSQL # Loading class: DatabasePostgres # Attempting to connect to database "wikidb" as "wikiuser"... error: No database connection # Checking the version of Postgres... Warning: pg_version(): supplied argument is not a valid PostgreSQL link resource in /var/www/wiki/includes/db/DatabasePostgres.php on line 1078 FAILED. Required version is 8.1. You have 7.3 or earlier I am using Postgres 8.3 which makes the error message strange. The file "LocalSettings.php" was not created to the directory config so I cannot continue the installation without solving the problem.

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• Interview questions to ask employer for tech support role

  - by Kernel Panic

  Possible Wiki question. What questions should I ask a potential employer for a position as an intern in a tech support role? This is the first interview offer I have had after 18 months of unemployment. I don't have a background in tech support or sysadmining. What are some metrics a tech support person would want to know about the position. What questions would flesh out more of the job description, without making me look like the impostor I obviously am? Thank you kindly.

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• Good fractal visualizer

  - by Gnoupi

  Each time it's the same thing, I find one, then I forget the name of it the next time I want to "dive" into such things. I'm looking for a good fractal "visualizer". The kind in which you just select a well-known fractal model (or variations on it), and in which you can then "dive" into, just zooming in or out smoothly, for the cheer pleasure of losing yourself in it. I'm looking for an executable, preferably for Windows, but any OS accepted. Keep to one program per answer (and one answer per program), as this is community wiki.

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• Free IP address management software

  - by TiFFolk

  We are choosing a system for managing our IP address space. So we are looking for a special free software like IPPlan. So what we have nowadays: Ipplan (Does not support IPv6) SolarWinds IP address tracker (IPv6 support unknown ) IP module of The NOC Project (BTW, take a look of it, seems to be very promising project) (IPv6 support unknown ) phpIP (Does not support IPv6) IP management from RackTables (Does not support IPv6) Do you know about any other special software, like written above? But: No Wiki No DNS No DHCP No spreadsheet Software should provide: Clear view of available addresses Detail listing of all addresses by subnets/search pattern/owners/additional info It must support adding additional info like owner of IP, domain-name, contacts, etc Multi user support Easy interface Software has to be specially written for address management. Scalability Any OS: win, lin, sol, web

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• Fatal error on "mode 120000" file during git -> svn migration

  - by Oliver

  Following instructions from the following website: http://code.google.com/p/support/wiki/ImportingFromGit I'm trying to migrate a git repository to svn, but during the "git rebase master tmp" step it fails with the following error after apply the first few patches: $ git rebase master tmp First, rewinding head to replay your work on top of it... Applying: Imported Applying: Cleaned up the readme file Applying: fix problem with versions fatal: unable to write file foobar mode 120000 Patch failed at 0003 fix problem with versions When you have resolved this problem run "git rebase --continue". If you would prefer to skip this patch, instead run "git rebase --skip". To restore the original branch and stop rebasing run "git rebase --abort". I understand that 120000 may refer to a symlink, but Subversion has supported symlinks for a long time now. Subversion installed is 1.6.5, Git is 1.6.3.3. Running on Ubuntu Linux. The system is not running out of disk space and this operation is taking place within my home directory so permissions should not be an issue.

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• Manual Duplex for Mac (and/or Linux)

  - by chris_l

  Hi, my printers don't support automatic duplex printing. I'm looking for a solution for my Mac (BTW, also for Linux) that I've seen with most Windows printer drivers: Check "Manual duplex" in the printer screen Printer starts printing one side A dialog appears, asking me to flip the pages Printer prints the other side. One thing I can do, is "print odd pages", then reopen the dialog and "print even pages", but this is very inconvenient, especially when I only want to print a certain page range of the document (the Mac dialog forgets my previous page range every time). It gets even more inconvenient, when printing 2-up double sided, or when changing additional settings for this one printout. So is there maybe some tool, that can do this? Or maybe a "virtual printer driver" that can sit somewhere between the dialog and the actual printer driver, which manages these steps? (The Windows tool http://en.wikipedia.org/wiki/FinePrint can do something like that, but I don't need all of its features - and I need it on Mac/Linux) Thanks, Chris

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• How can I configure MediaWiki to display numbers in titles?

  - by Wikis

  We would like to display numbers in the titles in our MediaWiki wiki. Specifically: in the table of contents numbers are shown like this: 1 Title 1.1 Subtitle 2 Another title However, on the page the titles (that map to the table of contents) appear like this: Title text Subtitle text Another title text That is, no numbers are shown. How can we show numbers in the page contents? There are three possible ways that this could be answered (that I can think of). In our order of preference, they are: Setting per user Setting per page Global setting (for all users)

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• Ubuntu VPS - email and webserver

  - by xZero

  I have a VPS based on Ubuntu, it has installed whole LAMP, everything needed for a web server and it works perfectly, but I'm still not able to configure it as a mail server.... I have configured MX record for my domain mail.mydomain.com and this part is OK, I also installed Postfix, Dovecot and Roundcube, configured it using this tutorial: http://ubuntuguide.org/wiki/Mail_Server_setup And after hours of configuring it doesn't work. I have experience with Linux and web hosting, but I successfully configured mail server once in past on Debian 6, and that with help from there. When I try to send email to me my gmail says: Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain mydomain.com by dc147738a1117e4c12273.mydomain.com. [MY_SERVER_IP]. The error that the other server returned was: 554 5.7.1 <[email protected]>: Relay access denied Also I have Webmin control panel which works perfectly, how to configure postfix and dovecot from there? Thanks in advance.

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• Next generation of command shells?

  - by ignatius

  I am curious about if there is any project about a replacement for the current unix-shells (like bash, ash, rsh ...), at least adding some new ideas or paradigm in this area. I was searching but i found very few information, this project http://en.wikipedia.org/wiki/Friendly_interactive_shell seems interesting, but not so diferent from the nowadays solutions. What do you think? Do you imagine a linux-distribution on 2020 that still having bash? How can be an evolution of this programs? Br To be clearer, about new ideas, i was talking of something like: control-Z functionality Colaboration features (like remote desktop) so you can invite someone to join and participate on your shell session Possibility to see the result of a command before to really apply it to your system (this is closely related with the 1st point ctl-Z) etc...

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• foswiki: use genPDF extension with topic templates?

  - by Mica

  I have a foswiki installation for keeping ISO and other documents. I would like to create a PDF from each page. How can I create a topic template with different headers and footers for each topic template? More info: When a user creates a new topic, they can choose a template. I've made several templates for Functional and Programming specs. The functional spec and programming spec require different document numbers. I would like for the software engineers to be able to create a new topic, choose the template, then be able to generate a PDF from the wiki page, pulling the appropriate document number, and some other text into the headers and footers. I am not very familiar, and haven't been able to find any examples on doing this. Any help would be appreciated!

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