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• So i ran sudo apt-get install kubuntu-full on my Ubuntu... and saw all the apps...now I want it off...help?

  - by Alex Poulos

  I'm running 12.04 - I installed kubuntu to try it out and realized that with all the bloatware applications that I didn't want it anymore - I was able to uninstall the kubuntu-desktop but there are still packages left over... How can I make sure I get rid of EVERYTHING Kubuntu installed - even the kde leftovers? Here's some of what's left when I ran sudo apt-get autoremove kde then "tab" it displayed this: kdeaccessibility kdepim-runtime kdeadmin kde-runtime kde-baseapps kde-runtime-data kde-baseapps-bin kdesdk-dolphin-plugins kde-baseapps-data kde-style-oxygen kde-config-cron kdesudo kde-config-gtk kdeutils kde-config-touchpad kde-wallpapers kdegames-card-data kde-wallpapers-default kdegames-card-data-extra kde-window-manager kde-icons-mono kde-window-manager-common kdelibs5-data kde-workspace kdelibs5-plugins kde-workspace-bin kdelibs-bin kde-workspace-data kdemultimedia-kio-plugins kde-workspace-data-extras kdenetwork kde-workspace-kgreet-plugins kdenetwork-filesharing kde-zeroconf kdepasswd kdf kdepim-kresources kdm kdepimlibs-kio-plugins kdoctools Those are all installed by kubuntu... correct? I just want to go back to my Ubuntu 12.04LTS with Gnome2-classic and without all the kubuntu extras. I started it off by just removing unnecessary apps that came with kubuntu-full - then realized I didnt want the whole thing at all and uninstalled kubuntu-full but it still says I have these as well: alex@griever:~$ sudo apt-get --purge remove kubuntu- kubuntu-debug-installer kubuntu-netbook-default-settings kubuntu-default-settings kubuntu-notification-helper kubuntu-firefox-installer kubuntu-web-shortcuts

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• Help with a simple incremental backup script

  - by Evan

  I'd like to run the following incomplete script weekly in as a cron job to backup my home directory to an external drive mounted as /mnt/backups #!/bin/bash # TIMEDATE=$(date +%b-%d-%Y-%k:%M) LASTBACKUP=pathToDirWithLastBackup rsync -avr --numeric-ids --link-dest=$LASTBACKUP /home/myfiles /mnt/backups/myfiles$TIMEDATE My first question is how do I correctly set LASTBACKUP to the the the directory in /backs most recently created? Secondly, I'm under the impression that using --link-desk will mean that files in previous backups will not will not copied in later backups if they still exist but will rather symbolically link back to the originally copied files? However, I don't want to retain old files forever. What would be the best way to remove all the backups before a certain date without losing files that may think linked in those backups by currents backups? Basically I'm looking to merge all the files before a certain date to a certain date if that makes more sense than the way I initially framed the question :). Can --link-dest create hard links, and if so, just deleting previous directories wouldn't actually remove linked file? Finally I'd like to add a line to my script that compresses each newly created backup folder (/mnt/backups/myfiles$TIMEDATE). Based on reading this question, I was wondering if I could just use this line gzip --rsyncable /backups/myfiles$TIMEDATE after I run rsync so that sequential rsync --link-dest executions would find already copied and compressed files? I know that's a lot, so many thanks in advance for your help!!

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• Dependent on CVS tagging for automated builds

  - by OMG Ponies

  My current work relies on using tags in CVS for an automated build process (ANT currently) to build for respective environments (development, QA, production). From our research, neither Git or Subversion support tagging in the same manner. If we use Subversion or Git, they don't support tags (in the same manner - please correct me?). So how would ANT or Maven know what to pick up for the respective build? Example: For a webapp, when viewing our repository say for the web.xml file -- the history would look like: web.xml v1 ... web.xml v1.2.3 Tag: Prod web.xml v1.2.4 web.xml v1.2.5 Tag: QA web.xml v1.2.6 web.xml v1.2.7 Head The ANT build scripts are run as CRON jobs, at different times & intervals for different environments. The environment build is based on the repository checkout, based on the tag. Development continues, and eventually the respective tags are moved: web.xml v1 ... web.xml v1.2.3 web.xml v1.2.4 web.xml v1.2.5 web.xml v1.2.6 Tag: Prod web.xml v1.2.7 Tag: QA web.xml v1.2.8 Head

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• Remote reboot over ssh does not restart

  - by Finn Årup Nielsen

  I would like to remotely reboot my Ubuntu 12.04 LTS server via ssh. I do sudo reboot and I loose connection and the server connection does not reappear. It does not ping. When I go the the physical computer with a screen attached I see a black screen and hear that the server is still on. I do a hard power off (press power on button for a few seconds) and the server halts. After I press power on the server boots with no problem. As far as I remember the remote reboot has previously worked on that server. I wonder if sudo reboot & will help? I suppose I could also try sudo shutdown -r and see if that does any difference. I have listed an excerpt of /etc/log/syslog below. The last thing it records is the stopping of the logging. Oct 24 10:14:49 servername kernel: [1354427.594709] init: cron main process (1060) killed by TERM signal Oct 24 10:14:49 servername kernel: [1354427.594908] init: irqbalance main process (1080) killed by TERM signal Oct 24 10:14:49 servername kernel: [1354427.595299] init: tty1 main process (1424) killed by TERM signal Oct 24 10:14:49 servername kernel: [1354427.637747] init: plymouth-upstart-bridge main process (20873) terminated with status 1 Oct 24 10:14:49 servername kernel: Kernel logging (proc) stopped. Oct 24 10:14:49 servername rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="876" x-info="http://www.rsyslog.com"] exiting on signal 15. Oct 24 10:25:34 servername kernel: imklog 5.8.6, log source = /proc/kmsg started. Oct 24 10:25:34 servername rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="862" x-info="http://www.rsyslog.com"] start

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• Google bots are severely affecting site performance

  - by Lynn

  I have an aggregate site on a linux server that pulls in feeds from a universe of about 2,000 blogs. It's in Wordpress 3.4.2 and I have a cron job that is staggered to run five times an hour on another server to pull in the stories and then publish them to the front page of this site. This is so I didn't put too much pressure all on one server. However, the Google bots, which visit a few times every hour bring the server to its knees in the morning and evenings when there is an increase in traffic on the site. The bots have something like 30,000 links to follow at this point. How do I throttle the bots to simply grab the new stories off the front page and stop there? EDIT- Details of my server configuration: The way we have this set up is the server that handles all the publishing is an unmanaged instance via AWS. It mounts the NFS server and connects to the RDS to update content, etc. You get to this publishing instance via a plugin that detects the wp-admin link and then redirects you into there. The front end app server also mounts the NFS and requests data from the RDS. It is the only one that has the WP Super Cache on it.... The OS is Ubuntu on the App server and the NFS runs CentOs. The front end is Nginx and the publishing server is Apache.

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• basic beginning emacs questions - install latest version and pick appropriate UI

  - by MountainX

  I'm running the latest Kubuntu (12.04 beta 2) and I would like to run the latest emacs (currently v24). The repos are one version behind. What's the best way to install v24 or later (and avoid future version conflicts)? Also, is there any reason not to aways use the GUI version of emacs if X is running? For example, could I set the GUI emacs version as the default text editor and use it to edit cron jobs (crontab -e)? I'm assuming the answer is yes, but since I haven't done that yet (my default editor is nano), I want to check if there are reasons I should leave nano as the default editor. Usually when I'm working on the command line I end up using nano. Now that I think about it, I have no idea why I keep doing that. Is there any downside to calling a GUI editor when working in an X terminal? EDIT: I briefly tested these two versions GNU Emacs 24.0.94.1 (x86_64-pc-linux-gnu, GTK+ Version 3.3.20) from GNU Emacs 23.3.1 (x86_64-pc-linux-gnu) installed by default in Kubuntu. This post explains some of the differences between versions. Unfortunately (for me) the defaults installed version (23.3.1, 23.3+1-1ubuntu9) is the nox version. Package: emacs23-nox Status: install ok installed Version: 23.3+1-1ubuntu9 Replaces: emacs23, emacs23-gtk, emacs23-lucid The package with version 24 opens in GUI mode by default. That's what I prefer. Some of the version 24 changes that interest me are listed in the references below. But there appear to be a multitude of different packages and versions I could install. References: What’s New In Emacs 24 (part 1) | Mastering Emacs http://www.masteringemacs.org/articles/2011/12/06/what-is-new-in-emacs-24-part-1/ " shell-mode uses pcomplete rules, with the standard completion UI. Yowzah! There’s a lot of cool, new functionality hidden away in this gem of a change." EmacsWiki: Recent Changes http://www.emacswiki.org/emacs/?action=rc;showedit=0

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• Entry / JR Php Programmer - What do I learn next?

  - by dtj

  I got very interested in programming toward the end of college. Took a few classes, but learned most everything on my own via books and such. Its mostly been Php and MySQL. Right out of school, I got a job working at a company for 2 years (web media) and ended up learning a lot of stuff and programming some things for them. I am no longer at that company but I am looking for my next steps as a programmer. I really enjoy Web Development and Php and MySQL seems to be my thing. Basically, I know how to do CRUD operations, i am mediocre at OOP and still have more to learn, I know HTML and CSS quite well, I know my way around a Unix terminal and can access MySQL through it and set up cron jobs and such. I know some basic Javascript. Whats a good next step? I don't anything about 3rd party services, PDO, APIs (twitter, facebook, etc), Drupal / Joomla, Unit Testing, E-Commerce, PECL, PEAR ....in other words A LOT I get easily overwhelmed by the amount of stuff there is to learn, so I'm sort of trying to find a path. Right now, I'm digging into OOP more, as that seems like a good conceptual first-step. Any suggestions?

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• How can I check Internet connectivity in a console?

  - by Ashfame

  Is there an easy way to check Internet connectivity from console? I am trying to play around in a shell script. One idea I seem is to wget --spider http://www.google.co.in/ and check the HTTP response code to interpret if the Internet connection is working fine. But I think there must be easy way without the need of checking a site that never crash ;) Edit: Seems like there can be a lot of factors which can be individually examined, good thing. My intention at the moment is to check if my blog is down. I have setup cron to check it every minute. For this, I am checking the HTTP response code of wget --spider to my blog. If its not 200, it notifies me (I believe this will be better than just pinging it, as the site may under be heavy load and may be timing out or respond very late). Now yesterday, there was some problem with my Internet. LAN was connected fine but just I couldn't access any site. So I keep on getting notifications as the script couldn't find 200 in the wget response. Now I want to make sure that it displays me notification when I do have internet connectivity. So, checking for DNS and LAN connectivity is a bit overkill for me as I don't have that much specific need to figure out what problem it is. So what do you suggest how I do it?

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• Why is sudo bash different from regular bash

  - by cyberjar09

  Problem description : I am using something called play framework in my development which requires me to make the python script play available in the path. Hence I create a symbolic link in /usr/local/bin ... Now I have written a shell script (call it status.sh) which calls this python script as follows : play status <some values here related to my app> &> /tmp/xyz.txt and this shell script then sends me the file via email. This works perfectly when I execute the script as follows ./script.sh. However when the script is executed as a cron expression everyday I get an output from stderr saying 'play: command not found'. Hence I did some digging on my own and here are my findings : echo $PATH when I am on the shell shows that I have /usr/local/bin available to me hence I can successfully execute the command play status however when I type in sudo bash and then echo $PATH I do not have the path /usr/local/bin anymore. It is a limited set of folders (one of them being /usr/bin). Q : Why this behavior ?! I fail to understand why the path is different. Also as a workaround would you suggest I do : new symbolic link from /usr/bin to /usr/local/bin (what are the side effects of this?) remove /usr/local/bin sym link altogether and only use /usr/bin is there a convention that I am not following here for linking new programs and executing them from $PATH ? Thanks.

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• login takes long time

  - by Arkaprovo Bhattacharjee

  I am using Ubuntu 12.04 from past 12 days. In the beginning login was fast enough after I put the password it hardly takes 3 to 4 sec to enter in desktop, but now its taking like more that 40 sec to show desktop after entering password. whats the problem, is there any solution? P.S there is only two programs (psensor and jupiter) that starts automatically after login. boot.log fsck from util-linux 2.20.1 /dev/sda6: clean, 254544/3325952 files, 2133831/13285632 blocks * Stopping Userspace bootsplash[164G[ OK ] * Stopping Flush boot log to disk[164G[ OK ] * Starting mDNS/DNS-SD daemon[164G[ OK ] Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox * Starting bluetooth daemon[164G[ OK ] * Starting network connection manager[164G[ OK ] * Starting AppArmor profiles [170G [164G[ OK ] * Stopping System V initialisation compatibility[164G[ OK ] * Starting CUPS printing spooler/server[164G[ OK ] * Starting System V runlevel compatibility[164G[ OK ] * Starting Bumblebee supporting nVidia Optimus cards[164G[ OK ] * Starting LightDM Display Manager[164G[ OK ] * Starting save kernel messages[164G[ OK ] * Starting anac(h)ronistic cron[164G[ OK ] * Starting ACPI daemon[164G[ OK ] * Starting regular background program processing daemon[164G[ OK ] * Starting deferred execution scheduler[164G[ OK ] speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Starting CPU interrupts balancing daemon[164G[ OK ]

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• check what process was causing the problem of high cpu load

  - by linuxk

  I'm running nginx wordpress server in KVM using 12.04 server x86. It was running very well about 4 month until 2 hours ago. I found that my website is down and no ping response. Virt-manager logged high cpu load(plz see the picture below) before unexpected shut down. I want to know what process caused unexpected shutdown. The following log files make me think my server is attacked. Any suggestions and help would be appreciated. kern.log and syslog showed me same output. Nov 11 03:54:11 www kernel: [1344541.156239] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=0.0.0.0 DST=224.0. 0.1 LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2 Nov 11 03:54:11 www kernel: [1344541.156315] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=0101:080a:2334:c90 0:0100:0000:0000:0000 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1 FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0 /nginx/access.log showed me 119.235.237.17 - - [11/Nov/2012:03:45:29 +0900] "GET /blog HTTP/1.1" 200 30493 "-" "Yeti/1.0 (NHN Corp.; http://help.naver.com/robots/)" my-server-ip - - [11/Nov/2012:11:05:30 +0900] "POST /wp-cron.php?doing_wp_cron=13 HTTP/1.0" 499 0 "-" "WordPress/3.4.2; http://mywebsite.com" Server turned on in here. 119.235.237.16 - - [11/Nov/2012:11:05:30 +0900] "GET /blog HTTP/1.1" 200 32935 "-" "Yeti/1.0 (NHN Corp.; http://help.naver.com/robots/)"

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• How to spread XML Sitemaps over several webservers behind AWS loadbalancer?

  - by Jurik

  We have a web portal with almost a million products and way more other urls. I wrote a script that checks database. If there is a new url needed or an old one update, this script will update/create the XML Sitemaps. But we have several servers behind the load balancer at our rented AWS space. Further this script checks database for each url if there was an update so that it updates the appropriate xml file too. My question is how to spread those XML Sitemaps over all webservers behind this AWS load balancer? Our approaches/ideas: we could just generate them on one server with a cron job and copy them to the other servers, but this could be difficult because of automatic raising numbers of servers and so on. we put them on our S3 - but this one is not avaible thru our domain, so I guess google will have a problem with it I let my script run on every webserver but change it in a way that it will generate each time all xml files if they do not exist. But then I would have conflicts with updated URLs in my database, where I saved timestamp of last changed value of every url Is there another - better - solution that I do not know? Are there any special services by amazon for such cases?

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• UPDATE MANAGER UNABLE TO UPDATE

  - by muguro

  Requires installation of untrusted packages The action would require the installation of packages from not authenticated sources. i get this error every time i try updating. the system shows that it has 466 updates but fails after clicking update more details have this accountsservice apparmor apport apport-gtk apt apt-transport-https apt-utils aptdaemon aptdaemon-data at-spi2-core bamfdaemon base-files bcmwl-kernel-source bind9-host compiz compiz-core compiz-gnome compiz-plugins-default cron cups cups-bsd cups-client cups-common cups-filters cups-ppdc dbus dbus-x11 dconf-gsettings-backend dconf-service desktop-file-utils dmsetup dnsutils empathy empathy-common eog evince evince-common evolution-data-server evolution-data-server-common firefox firefox-globalmenu firefox-gnome-support firefox-locale-en fontconfig fontconfig-config fonts-liberation fonts-opensymbol foomatic-filters gcalctool gdb ghostscript ghostscript-cups ghostscript-x ginn gir1.2-atspi-2.0 gir1.2-dbusmenu-glib-0.4 gir1.2-dbusmenu-gtk-0.4 gir1.2-gst-plugins-base-0.10 gir1.2-gtk-3.0 gir1.2-gtksource-3.0 gir1.2-gudev-1.0 gir1.2-javascriptcoregtk-3.0 gir1.2-launchpad-integration-3.0 gir1.2-pango-1.0 gir1.2-rb-3.0 gir1.2-totem-1.0 gir1.2-ubuntuoneui-3.0 gir1.2-unity-5.0 gir1.2-webkit-3.0 glib-networking glib-networking-common glib-networking-services gnome-accessibility-themes gnome-control-center gnome-control-center-data gnome-desktop3-data gnome-games-data gnome-icon-theme gnome-media gnome-orca gnome-settings-daemon gnome-sudoku gnomine gnupg google-talkplugin gpgv grub-common grub-pc grub-pc-bin grub2-common gstreamer0.10-alsa gstreamer0.10-plugins-base gstreamer0.10-plugins-base-apps gstreamer0.10-x gvfs gvfs-backends gvfs-bin gvfs-common gvfs-daemons gvfs-fuse gvfs-libs gwibber gwibber-service gwibber-service-facebook gwibber-service-identica gwibber-service-twitter hdparm hplip hplip-data indicator-sound initscripts isc-dhcp-client isc-dhcp-common jockey-common jockey-gtk krb5-locales landscape-client-ui-install language-pack-en language-pack-en-base language-pack-gnome-en language-pack-gnome-en-base launchpad-integration libaccountsservice0 libapt-inst1.4 libapt-pkg4.12 libart-2.0-2 libasound2 libatspi2.0-0 libbamf0 libbamf3-0 libbind9-80 libc-bin libc-dev-bin libc6 libc6-dev libcairo-gobject2 libcairo2

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• django & postgres linux hosting (with SSH access) recommendations

  - by Justin Grant

  We're looking for a good place to host our custom Django app (a fork of OSQA) and its postgresql backend. Requirements include: Linux Python 2.6 or (ideally) Python 2.7 Django 1.2 Postgres 8.4 or later DB backup/restore handled by the hoster, not us OS & dev-platform-stack patching/maintenance handled by the hoster, not us SSH access (so we can pull source code from GitHub, so we can install python eggs, etc.) ability to set up cron jobs (e.g. to send out dail email updates) ability to send up to 10K emails/day good performance (not ganged up with a zillion other sites on one CPU, not starved for RAM) FTP or SCP access to web logs dedicated public IP SSL support Costs under $1000/month for a relatively small site (<5M pageviews/month) Good customer service We already have a prototype site running on EC2 on top of a Bitnami DjangoStack. The problem is that we have to patch the OS, patch postgres, etc. We'd really prefer a platform-as-a-service (PaaS) offering, like Heroku offers for Rails apps, where all we need to worry about is deploying our code instead of worrying about system software patching and maintenance. Google App Engine is closest to what we're looking for, but they don't offer relational DB access (not yet at least). Anyone have a recommendation?

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• Is there any way to kill a zombie process without reboot?

  - by Pedram

  Is there any way to kill a zombie process without reboot?Here is how it happens: I wanted to download a 12GB torrent.After adding the .torrent file, transmission turned into a zombie process.I tried ktorrent too.Same behavior.Finally I could download the file using µTorrent but after closing the program, it turns into a zombie as well. I tried using kill skill and pkill with different options and -9 signal but no success. In some answers in web I found out killing the parent can kill the zombie, but killing wine didn't help either. Is there another way? Edit: ps -o pid,ppid,stat,comm PID PPID STAT COMMAND 7121 2692 Ss bash 7317 7121 R+ ps pstree output: init---GoogleTalkPlugi---4*[{GoogleTalkPlug}] +-NetworkManager---dhclient ¦ +-{NetworkManager} +-acpid +-apache2---5*[apache2] +-atd +-avahi-daemon---avahi-daemon +-bonobo-activati---{bonobo-activat} +-clock-applet +-console-kit-dae---63*[{console-kit-da}] +-cron +-cupsd +-2*[dbus-daemon] +-2*[dbus-launch] +-desktopcouch-se---desktopcouch-se +-explorer.exe +-firefox---run-mozilla.sh---firefox-bin---plugin-containe---8*[{plugin-contain}] ¦ +-14*[{firefox-bin}] +-gconfd-2 +-gdm-binary---gdm-simple-slav---Xorg ¦ ¦ +-gdm-session-wor---gnome-session---bluetooth-apple ¦ ¦ ¦ ¦ +-fusion-icon---compiz---sh---gtk-window-deco ¦ ¦ ¦ ¦ +-gdu-notificatio ¦ ¦ ¦ ¦ +-gnome-panel ¦ ¦ ¦ ¦ +-gnome-power-man ¦ ¦ ¦ ¦ +-gpg-agent ¦ ¦ ¦ ¦ +-nautilus---bash ¦ ¦ ¦ ¦ ¦ +-{nautilus} ¦ ¦ ¦ ¦ +-nm-applet ¦ ¦ ¦ ¦ +-polkit-gnome-au ¦ ¦ ¦ ¦ +-2*[python] ¦ ¦ ¦ ¦ +-qstardict---{qstardict} ¦ ¦ ¦ ¦ +-ssh-agent ¦ ¦ ¦ ¦ +-tracker-applet ¦ ¦ ¦ ¦ +-trackerd ¦ ¦ ¦ ¦ +-wakoopa---wakoopa ¦ ¦ ¦ ¦ ¦ +-3*[{wakoopa}] ¦ ¦ ¦ ¦ +-{gnome-session} ¦ ¦ ¦ +-{gdm-session-wo} ¦ ¦ +-{gdm-simple-sla} ¦ +-{gdm-binary} +-6*[getty] +-gnome-keyring-d---2*[{gnome-keyring-}] +-gnome-screensav +-gnome-settings- +-gnome-system-mo---{gnome-system-m} +-gnome-terminal---bash---ssh ¦ +-bash---pstree ¦ +-gnome-pty-helpe ¦ +-{gnome-terminal} +-gvfs-afc-volume---{gvfs-afc-volum} +-gvfs-fuse-daemo---3*[{gvfs-fuse-daem}] +-gvfs-gdu-volume +-gvfsd +-gvfsd-burn +-gvfsd-http +-gvfsd-metadata +-gvfsd-trash +-hald---hald-runner---hald-addon-acpi ¦ ¦ +-hald-addon-cpuf ¦ ¦ +-hald-addon-inpu ¦ ¦ +-hald-addon-stor ¦ +-{hald} +-hotot---xdg-open ¦ +-3*[{hotot}] +-indicator-apple +-indicator-me-se +-indicator-sessi +-irqbalance +-kded4 +-kdeinit4---kio_http_cache_ ¦ +-klauncher +-kglobalaccel +-knotify4 +-modem-manager +-multiload-apple +-mysqld---10*[{mysqld}] +-named---10*[{named}] +-nmbd +-notification-ar +-notify-osd +-pidgin---{pidgin} +-polkitd +-pulseaudio---gconf-helper ¦ +-2*[{pulseaudio}] +-rsyslogd---2*[{rsyslogd}] +-rtkit-daemon---2*[{rtkit-daemon}] +-services.exe---plugplay.exe---2*[{plugplay.exe}] ¦ +-winedevice.exe---3*[{winedevice.exe}] ¦ +-3*[{services.exe}] +-smbd---smbd +-snmpd +-sshd +-timidity +-trashapplet +-udevd---2*[udevd] +-udisks-daemon---udisks-daemon ¦ +-{udisks-daemon} +-upowerd +-upstart-udev-br +-utorrent.exe---8*[winemenubuilder] ¦ +-{utorrent.exe} +-vnstatd +-winbindd---2*[winbindd] +-2*[winemenubuilder] +-wineserver +-wnck-applet +-wpa_supplicant +-xinetd System monitor and top screenshots which show the zombie process is using resources:

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• Using Google App Engine to Perform World Updates vs an Authoritative Server

  - by Error 454

  I am considering different game server architectures that use GAE. The types of games I am considering are turn-based where the world status would need to be updated about once per minute. I am looking for an answer that persuades me to either perform the world update on the google servers OR an authoritative server that syncs with the datastore. The main goal here would be to minimize GAE daily quotas. For some rough numbers, I am assuming 10,000 entities requiring updates. Each entity update would require: Reading 5 private entity variables (fetched from datastore) Fetching as many as 20 static variables (from datastore or persisted in server memory) Writing 5 entity variables Clients of the game would authenticate and set state directly against GAE as well as pull the latest world state from GAE. Running the update on GAE would consist of a cron job launched every minute. This would update all of the entities and save the results to the datastore. This would be more CPU intensive for GAE. Running the update on an authoritative server would consist of fetching entity data from the GAE datastore, calculating the new entity states and pushing the new state variables back to the datastore. This would be more bandwidth intensive for the datastore.

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• Help parsing long (3.5mil lines) text file, line by line and storing data, need a strategy

  - by Jarrod

  This is a question about solving a particular problem I am struggling with, I am parsing a long list of text data, line by line for a business app in PHP (cron script on the CLI). The file follows the format: HD: Some text here {text here too} DC: A description here DC: the description continues here DC: and it ends here. DT: 2012-08-01 HD: Next header here {supplemental text} ... this repeats over and over for a few hundred megs I have to read each line, parse out the HD: line and grab the text on this line. I then compare this text against data stored in a database. When a match is found, I want to then record the following DC: lines that succeed the matched HD:. Pseudo code: while ( the_file_pointer_isnt_end_of_file) { line = getCurrentLineFromFile title = parseTitleFrom(line) matched = searchForMatchInDB(line) if ( matched ) { recordTheDCLines // <- Best way to do this? } } My problem is that because I am reading line by line, what is the best way to trigger the script to start saving DC lines, and then when they are finished save them to the database? I have a vague idea, but have yet to properly implement it. I would love to hear the communities ideas\suggestions! Thank you.

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• Setting up a shared media drive

  - by Sam Brightman

  I want to have a shared media drive be transparently usable to all users, whilst also sticking to FHS and Ubuntu standards. The former takes priority if necessary. I currently mount it at /media/Stuff but /media is supposed to be for external media, I believe. The main issue is setting permissions so that access to read and write to the drive can be granted to multiple users working within the same directories. InstallingANewHardDrive seems both slightly confused and not what I want. It claims that this sets ownership for the top-level directory (despite the recursion flag): sudo chown -R USERNAME:USERNAME /media/mynewdrive And that this will let multiple users create files and sub-directories but only delete their own: sudo chgrp plugdev /media/mynewdrive sudo chmod g+w /media/mynewdrive sudo chmod +t /media/mynewdrive However, the group writeable bit does not seem to get inherited, which is troublesome for keeping things organised (prevents creation inside sub-folders originally made by another user). The sticky bit is probably also unwanted for the same reason, although currently it seems that one userA (perhaps the owner of the mount-point?) can delete the userB's files, but not vice-versa. This is fine, as long as userB can create files inside the directory of userA. So: What is the correct mount point? Is plugdev the correct group? Most importantly, how to set up permissions to maintain an organised media drive? I do not want to be running cron jobs to set permissions regularly!

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• How should I architect a personal schedule manager that runs 24/7?

  - by Crawford Comeaux

  I've developed an ADHD management system for myself that's attempting to change multiple habits at once. I know this is counter to conventional wisdom, but I've tried the conventional for years & am now trying it my way. (just wanted to say that to try and prevent it from distracting people from the actual question) Anyway, I'd like to write something to run on a remote server that monitors me, helps me build/avoid certain habits, etc. What this amounts to is a system that: runs 24/7 may have multiple independent tasks to run at once may have tasks that require other tasks to run first lets tasks be scheduled by specific time, recurrence (ie. "run every 5 mins"), or interval (ie. "run from 2pm to 3pm") My first naive attempt at this was just a single PHP script scheduled to run every minute by cron (language was chosen in order to use a certain library, but no longer necessary). The logic behind when to run this or that portion of code got hairy pretty quick. So my question is how should I approach this from here? I'm not tied to any one language, though I'm partial to python/javascript. Thoughts: Could be done as a set of scripts that include a scheduling mechanism with one script per bit of logic...but the idea just feels wrong to me. Building it as a daemon could be helpful, but still unsure what to do about dozens of if-else statements for detecting the current time

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• What's the canonical process for backing up a website?

  - by Walkerneo

  This is going to sound terrible, but bear with me. I currently have a cron job that does a mysql dump, a git add all and commit, and a git push to bitbucket. I set this up almost a year ago, when I didn't know much about git, backups, and general web development and administration. I haven't had the time to fix this and do it properly, but the repo has now grown quite big from accumulating large temporary files from my forum, so now I have to do something and I want to do it properly this time around. What processes do semi-large websites and personal site admins use for backing up server content? Based on what I've learned since I set this up, what I'm currently think of doing is: Making changes on a development domain and committing the code frequently Archiving the entire site after a successful deployment from the development domain Having automatic daily database and user-content backups. I still like the idea of backing up sqldumps with git, though. I know git isn't a backup tool and that this is beyond its purpose, but the textual queries that are exported would be easily managed by git and would save a lot of space in archives.

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• Looking for a way to give acces to some programs for a limited period of time

  - by R. L.

  I install Linux on computers and add to the base installation some other programs. This computer then is sold to a customer as a larger instrument. Now, I am looking for a way to implement some kind licence for this computer so the user can use it for a year and then he would need to "renew" the licence. It is not my intention to lock the whole computer , blocking or deleting some folders should be enough. The only way I could think of was to setup a cron job that deletes my programs, or a second way would be to set the user account to expire after a year. But I give the computer with sudo privilages so the above solutions wouldn't be 100% safe. It is not my intention to encrypt any code, I just want block the possibility to execute certain programs. Is there a way or a program that would "licence the computer" ? Ideally it should be invisible to the user. After one year the program stops working and "he doesn't know why."

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• Is there a schematic overview of Ubuntu's architecture?

  - by joebuntu

  Hi there, as enthusiastic, advanced Linux learner, I'd love to get an overview about Linux' architecure/structure in general. You know, like "the big picture". I'm thinking of a large schematic graphic showing what is what, who is who, what system (e.g. X) comprises which subsystems (GDM/Gnome/Compiz) on the way from a to z, from boot to interactive desktop, including the most important background services (auth, network, cron, ...). Maybe a bit like this: http://www.flickr.com/photos/pgc/140859386/ but way more detailed. There's bootchart, which produces very comprehensive charts, but they again are too detailed and difficult to get the "big picture" from. Is there such a thing? Possibly not for the whole System, but maybe for single subsystems? I had trouble searching for this, because using search terms like "scheme" or "architecture" pointed to the wrong direction (a tool called "scheme" or CAD software for linux). I appreciate any links. If there's interest in those schematic overviews and links, maybe someone could turn this post into a wiki post? Cheers, joebuntu

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• Synchronizing 3 servers over IP

  - by user93078

  I'm setting up a medical server for a hospital that has doctors located in 3 different locations, meaning there would be 3 servers (1 in each location). All 3 servers would just have the following software: Ubuntu Server 12.04 minimal MySQL, PHP 5, Apache The medical software which would read/write to the MySQL database Remote admin apps like Nagios & Webmin Rsync for backup (rsync-over-ssh) as a cron job and the doctors at each location would access patient & billing data from their respective servers. What I'd like is, that each of these servers all have synchronized info (especially the mySQL database's) - let's say on an hourly basis each of these servers synchronize data to a common remote server and the data is then brought down to each of the servers. I know an easier way would be to have the medical app running on a remote web server, but since this is medical that we're talking about and knowing how common it is in our area for the net to go gown, I wouldn't like a web based scenatio. Is such a setup possible? Would this be the right way to do things or is there a better way to this? Would really appreciate views and comments (or how to set this up) on this.

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• Sending Emails from existing SMTP host from Ubuntu Server

  - by ezgoodnight

  I feel like my problem is very simple, but I've been trying for quite some time and haven't cracked it. You experienced server guys will probably laugh at this, but I'm finally at the point I need help or I'll never get anywhere. I have a little box running 12.04 LTS and I've wanted to script some status checks and have the server send me an email and schedule this with cron. I basically want a command line mail client that I can set up as easily as Thunderbird to send through my existing SMTP through the command line. Something that can easily be rolled into my bash scripts. I already have a remote host handling our email, SMTP, MTA, all that garbage. I don't particularly want to set up a relay just to send email when I have one that everyone else in the company already uses. I've tried, but there are too many aspects I don't understand AND I don't see why I should set up something local when we already pay for a remote host to do these things. If I absolutely have to set up sendmail or postfix, then so be it, but I'd appreciate a simple alternative. I'm open to practically anything at this point.

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• Is text-only mode a saving or a problem for battery savings?

  - by Robottinosino

  A friend is flying to the US from Europe and asked me a very thought-provoking question, which I am not remotely able to answer with substance so I am asking it here: How to absolutely maximise battery life on an Ubuntu (laptop) install? do not rush to mark this as duplicate, there is an important point here: does -GNOME- help or worsen battery life? Let me provide some context: The only task he needs to perform is: edit text files in Vim. He is unsure whether running GNOME will drain his battery life more or actually save him some battery life given the smarts of GNOME's power management features like "switch this peripheral to -power save- after X minutes..." (GNOME might just be a configuration front-end for settings that are governed by command-line utils for all I know?) He could perfectly well boot the system in text-only mode and use the automatic 6 virtual consoles for his needs, if that's a saving at all over running tmux (I think so because of all the smart buffering/history/etc the latter does by default?) Exactly how would you advise him to run his laptop during his flight? What I told him already: power off WiFi in the BIOS, not from the "GUI" power off Bluetooth switch off the courtesy light and use low monitor brightness play music off of his phone, not mp3blaster do not use his tiny portable mouse (and do not attach any other USB gimmicks like "screen light", etc) stop development services he will not be using, especially apache2, tomcat, dovecot, postgresql, etc. Potentially: - switch off his cron jobs? (he does an rsync + tar + 7za of his "work in progress" every so often) I think the above is standard stuff one could get off StackExchange, and with many duplicates... the core of this question is, I think: __ will running Ubuntu in text-only mode be a saving in terms of battery life or a problem? why? (provide some technical arguments) __ I think it will be a saving but I am also scared about "other things" detecting and enabling advanced chipset power management features only when some services are started.. and fear these "services" may be off in text-only mode?

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