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• Good ways to restart all the computers in a remote cluster?

  - by vgm64

  I have a cluster that I manage and from time to time I get emails from each node (and head node) begging to be restarted after an automatic upgrade. Currently, my best solution so far is a shell script like: $> cat cluster_reboot.sh ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot ssh [email protected] reboot I end up just typing the root password six times, but it works, I guess. Is there a better way? Can I force the head node to reboot the computers for me?

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• Vi on Linux: show ^M line endings for DOS-format files

  - by sss

  On Solaris, if you open a file in vi that has Windows line endings, this shows up as ^M at the end of every line. On Linux, vi is cleverer and understands the Windows file format, and does not display ^M. Is there a setting to make Linux vi behave the same as Solaris in this respect? A common problem for us is copying a shell script off a (Windows) dev box and forgetting to dos2unix it, and then being confused when it doesn't work properly. On Solaris the problem is obvious as soon as you vi the file, but not on Linux. Thanks.

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• How to ensure full path in Windows batch FOR loop

  - by palswim

  I've created a generic batch (or Windows Command) file that lets me loop through the contents of a directory and call a command for each item. IF a%1==a ( set _DIR="%CD%") ELSE ( set _DIR="%~1") IF a%2==a ( set _COMMAND=rem) ELSE ( set _COMMAND=%2) IF a%3==a ( set _FILTER=*.*) ELSE ( set _FILTER=%3) set _OPTS=%4 FOR /F "delims=" %%f IN ('dir %_DIR%\%_FILTER% %_OPTS% /b') DO ( %_COMMAND% "%%f" ) But, I'm trying to determine how to ensure that I call %_COMMAND% on the correct file. I've tried pre-pending the directory variable onto the front, like %_COMMAND% %_DIR%\"%%f", but this leaves a quotation mark in the parameter I pass. For example, if I call my batch file exec_dir.bat, and call it with the following echo_test.bat, I see that all of the files have a quotation mark when echo_test.bat runs. echo %~dpn1.mp4 That batch script produces: > exec_dir.bat "C:\Users\User\Desktop\Test Folder" echo_test.bat *.txt C:\Users\User\Desktop\Test Folder\"Test File.txt C:\Users\User\Desktop\Test Folder\"Test2.txt My thought is that it has something to do with the \ as an escape character, but I can't seem to work around it.

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• Can't bind spawn-fcgi to address

  - by Xeoncross

  Following some nice instructions I am almost through setting up PHP to run on nginx. However, every time I try to start spawn-fcgi I get an error message demo@desktop:/usr/bin$ sudo /etc/init.d/php-fastcgi start spawn-fcgi: bind failed: Cannot assign requested address My /etc/init.d/php-fastcgi startup script is: #!/bin/bash PHP_SCRIPT=/usr/bin/php-fastcgi FASTCGI_USER=demo RETVAL=0 case "$1" in start) su - $FASTCGI_USER -c $PHP_SCRIPT RETVAL=$? ;; stop) killall -9 php5-cgi RETVAL=$? ;; restart) killall -9 php5-cgi su - $FASTCGI_USER -c $PHP_SCRIPT RETVAL=$? ;; *) echo "Usage: php-fastcgi {start|stop|restart}" exit 1 ;; esac exit $RETVAL console output which loads /usr/bin/php-fastcgi #!/bin/sh /usr/bin/spawn-fcgi -a 127.0.0.1 -p 9000 -C 6 -u demo -f /usr/bin/php5-cgi One thing to note is that I am running the PHP cgi as the user "demo" which is my account.

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• opennebula VM submission failure

  - by user61175

  I am new to OpenNebula, the cloud is up and running but the VM is failed to be submitted to a node. I got the following error from the log file. ERROR: Command "scp ubuntu:/opt/nebula/images/ttylinux.img node01:/var/lib/one/8/images/disk.0" failed. ERROR: Host key verification failed. Error excuting image transfer script: Host key verification failed. The key verification keeps failing. I need to know what is going wrong ... thanks :)

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• Manage Upload Permissions, SFTP & Linux

  - by John R

  I'm new to Linux. I am working with a Redhat 5.5 server and am using a Java-based SFTP script that will allow multiple users to upload text files to a server. I am undecided if each user will have a separate directory or if I will use a naming convention that includes their customer ID. The files include some personal information about their LAN settings, so I prefer to use SFTP as apposed to FTP. It is my understanding that SFTP is encrypted (Also, I have a Java class configured to upload via SFTP, so I prefer not to switch protocols unless their is a very-good reason). The prototype is for a system that will support large numbers of customers and the thought of continually adding and removing clients through the command line seems highly impractical. (Again, I am new_to/learning Linux and Redhat). What are normal conventions for giving multiple users permission to SFTP upload files with a unique username and password for each.

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• Mac Homebrew and Wireshark

  - by miku8

  I've installed Wireshark(.org) using Homebrew. brew install wireshark at the end the script says ==> ./configure --prefix=/usr/local/Cellar/wireshark/1.2.7 --disable-dependency-tracking --disable-wireshark ==> make ==> make install ==> Caveats We don't build the X11 enabled GUI by default ==> Summary /usr/local/Cellar/wireshark/1.2.7: 167 files, 50M, built in 5.4 minutes I'm not able to find the 'wireshark' GUI. Any idea of how to build it? Thanks

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• Numerous Unexpected Obstacles Ruining any Project Plans

  - by Libor

  I am working as software developer and struggling with this problem time and time again for almost thirteen years. There seems not to be any way out of the following problem. And it happens with small projects as well. For example, I plan to write an extension for Microsoft Visual Studio. I dowload learning materials, get some book on the topic and allocate time for learning and development. However, during the development, many seemingly trivial problems arise, for example: Why the script refuses to delete the file? Why Visual Studio does not register the extension? (after two days) OK, it registers it, but now it got broken. How to fix it? each of these "small" obstacles usually take 1-5 days to resolve and the project finally consumes several times more man-hours than planned. Maybe it happens only because I am working on Microsoft platform and many of their Frameworks and architectures are bit confusing and badly documented. I would like to have most problems resolved by finding answer in a book or official documentation (MSDN), but the only answer I usually find is on some weird forum or personal blog googled after desperately searching for any relevant information on the topic. Do you have the same struggles? Do you have techniques on how to prevent these problems? I was thinking of simply multiplying projected time for a given project by some factor, but this does not help. Some projects get done briskly and some take months and the guiding factor here are these small "glitches" which take programmers whole weeks to resolve. I have to admit that lots of these obstacles demoralizes me and drains me of focus and joy of work (who likes to get back to work when he have to resolve some stupid registry problem or weird framework bug instead of doing creative work?) After the project is finally done, I am feeling like dying from thousand cuts.

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• Tools for retrieving and modifying multi-value attributes in Microsoft ActiveDirectory

  - by Justin

  Most attributes in MSAD are single-valued and pose no problem. I am familiar with the dsquery user -samid jdoe | dsmod -webpg "http://some.url/" method. However, some attributes are multi-valued, such as telephone number and webpage. These values can be managed through the Active Directory Users & Computers Microsoft Console (dsa.msc) via the dialogue shown by clicking on the "Other..." button, but I'd really rather script the modifications. It seems to me that dsmod & dsget do not support multi-value retrieval and editing; only the first value of the set seems to be accesible. Am I correct? If I am not correct, I would appreciate a syntax example. If I am correct, would you please recommend an alternative scriptable tool that can handle multi-value attributes? The more "official and supported" the tool, the better.

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• problem installing mysql on ubuntu server 10.10 machine

  - by badperson

  Hi, I tried installing mysql a couple of times and I'm having problems. First of all, when I install it gives me a message that it's setting up and it just hangs. I can't ctl + c out of it, so I reboot the server and try to log into the db with sudo mysql -u root -p I enter my password and then get ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) I restart the server: sudo /etc/init.d/mysql start Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service mysql start Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the start(8) utility, e.g. start mysql ~$ I try this: aptitude search mysql | grep ^i i A libdbd-mysql-perl - Perl5 database interface to the MySQL data i libmysql-java - Java database (JDBC) driver for MySQL i A libmysqlclient16 - MySQL database client library i mysql-client-5.1 - MySQL database client binaries i A mysql-client-core-5.1 - MySQL database core client binaries i mysql-common - MySQL database common files, e.g. /etc/mys i mysql-embedded - MySQL - embedded library i mysql-server-core-5.1 - MySQL database server binaries When I navigate to the folder to see if the *.sock file exists: '/var/run/mysqld/mysqld.sock' it does not. I also try this: service mysql status status: Unable to connect to system bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory Any ideas? On my other machines installing mysql has been a snap, not sure what the problem is here. bp

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• Google Analytics setting cookies on static content despite being on entirely separate domain

  - by Donald Jenkins

  I recently decided to comply with the YSlow recommendation that static content is hosted on a cookieless domain. As I already use the root of my domain (donaldjenkins.com) to host my website—on which Google Analytics sets a few cookies—that meant I had to move the CNAME URL for the CDN serving the static files from cdn.donaldjenkins.com to an entirely separate, dedicated domain. I purchased cdn.dj (yes, it's a real Djibouti domain name), hosted the files on the root (which contains nothing else, other than a robots.txt file) and set a CNAME of e.cdn.dj for the CDN. This setup works, but I was rather surprised to find that YSlow was still flagging the static files for not being cookie-free: here's a screenshot: The cdn.djdomain was new, and was never used for anything other than hosting these static files. Running httpfox on the site shows the _utma and _utmz Google Analytics cookies are being set on the static files listed above—despite their being hosted on an entirely separate, dedicated domain. Here's my Google Analytics code: //Google Analytics tracking code var _gaq=[['_setAccount','UA-5245947-5'],['_trackPageview']]; (function(d,t){var g=d.createElement(t),s=d.getElementsByTagName(t)[0]; g.src=('https:'==location.protocol?'//ssl':'//www')+'.google-analytics.com/ga.js'; s.parentNode.insertBefore(g,s)}(document,'script')); // [END] Google Analytics tracking code I'm not obsessing about this issue—I know it's not really affecting server performance—but I'd like to just understand what is causing it not to go away...

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• Can it be harmful to grant jackd realtime priority?

  - by SuperElectric

  I am apt-get installing Ardour, a sound mixing program, just to try it out. Installing Ardour also installs JACK, a dependency. As part of the JACK installation script, I get the following dialog: If you want to run jackd with realtime priorities, the user starting jackd needs realtime permissions. Accept this option to create the file /etc/security/limits.d/audio.conf, granting realtime priority and memlock privileges to the audio group. Running jackd with realtime priority minimizes latency, but may lead to complete system lock-ups by requesting all the available physical system memory, which is unacceptable in multi-user environments. Enable realtime process priority? I'm installing on my laptop, which never has multiple simultaneous users. I still have concerns: is JACK something that'll be used by the system itself to play any sound (i.e. will it replace ALSA)? If so, does that mean that if I enable realtime priority for JACK, I'll run a slight risk of freezing the machine whenever any sound is played? Or is JACK only going to be used by Ardour for now (until I install some other JACK-dependent program)? Thanks, -- Matt

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• Windows 2008R2 blocks outbound LDAP for non-admins?

  - by Jon Bailey

  I've got a Windows 2008R2 terminal server with ~30 users on it. It's joined to a Samba-based domain. During the login script, we connect directly to the LDAP server to pull out certain profile information. This used to work just fine. Now, it doesn't, but only for non-local-admin accounts. Local admins work fine. As a non-local-admin: Connection to ports 389 or 636 just terminate (wireshark on the LDAP server reveals no connection attempt) Connection to other ports on the same server work fine Same thing on multiple LDAP servers Windows firewall is disabled Can't find any other rules/policies that may block this I suspect since this used to work, it came down during an update, but for the life of me, I can't find what. EDIT: I just ran Wireshark on the machine and didn't see anything when connecting to the LDAP server in question (or any LDAP server for that matter). I can, however, see traffic when I connect to that server on another port.

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• NIC models for HVM guests in Xen 4.0

  - by Jed Daniels

  Is there a list of NIC models that I should use with various HVM guests in Xen 4.0? Is there even a list of possible choices for the model=field? I'm planning on running both Windows and FreeBSD guests on the particular Xen box that I'm configuring now, and ideally I'd like a setting that can work on both of them and get me gigabit speeds without a lot of extra hassle loading special drivers (similar to VMware's e1000 NIC option). Any suggestions? The vif line I'm currently using in my config is: vif = [ 'type=ioemu,bridge=eth0,model=ne2k_pci,script=vif-ovs' ] This works in my Windows XP SP3 VM, but is only recognized as a 10Mbit interface. Changing to model=e1000 or model=i82557b resulted in Windows not being able to find a driver for the NIC.

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• Any Way to monitor JMX Servers with NetIq ?

  - by Carlos

  I ask this question after a search in the site, there's many JMX questions but I think no one with a NetIq involved. In the documentation of NetIq, There's no "module" to check JMX, but I have seen that u can make "custom" modules and "custom" scripts, in Perl and VbScript. The question is if anyone with more experience than me on NetIq, has made any custom script or module to check JMX. I look on technet too, for a JMX Api for Windos Shell or Powershell with no luck. Of course, JMX is much more powerfull, but what I really need is to "monitor" some values inside NetIq, because we cant install Nagios, Cacti, Hyperic or any other monitor software but NetIq. Thanks.

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• Slow performance by PHP directory operations on virtual machine (Ubuntu libvirt)

  - by thonixx

  Some days ago I installed an Ubuntu server and two running virtual machines with libvirt. Everything works fine except one performance problem. Everytime when I call a PHP script with directory operations the operations are very slow and not performant. Here is an example: http://zother.white-tiger.ch/ And here you see an example without a directory operation and how fast it is: http://michaeltanner.ch/ It's all on the same virtual server. The virtual machine uses 6 cores (8 are available) and 7500 megabytes RAM (8 Gigabyte are available). The disk image format is qcow2. How can I improve the performance?

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• Replicate / SYNC / Copy thousands of files

  - by rihatum

  Windows 32BIT Box (Server OS) 4GB RAM a 800GB LUN Mapped to the above box as a local drive Around 700GB of text files (Yes text files and a few thousand word documents) nested in thousands of directories. I need to move this to a new storage and map another server to it. What would be the best way to go about it ? What I did was mapped the existing LUN to our new box and mapped a LUN from the New storage to the new box too, and tried copying (windows copy) but that wasn't good / fast enough considering the downtime. I am now looking for either a script which will do this or a utility (prefer opensource / free) to move this size of data at a good speed. 2 x 1GB Nics teamed ether channel 2GBPs Any suggestions or pointers would be off great help Thanks !

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• MySQL open files limit

  - by Brian

  This question is similar to set open_files_limit, but there was no good answer. I need to increase my table_open_cache, but first I need to increase the open_files_limit. I set the option in /etc/mysql/my.cnf: open-files-limit = 8192 This worked fine in my previous install (Ubuntu 8.04), but now in Ubuntu 10.04, when I start the server up, open_files_limit is reported to be 1710. That seems like a pretty random number for the limit to be clipped to. Anyway, I tried getting around it by adding a line like this in /etc/security/limits.conf: mysql hard nofile 8192 I also tried adding this to the pre-start script in mysql's upstart config (/etc/init/mysql.conf): ulimit -n 8192 Obviously neither of those things worked. So where is the hoop that has been added between Ubuntu 8.04 and 10.04 through which I must jump in order to actually increase the open files limit?

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• Command-line access to remote MySQL server

  - by Jerry Krinock

  I administer a website on a remote, shared host. My web host offers MySQL, and I am able to access this from my Mac OS X computer using a GUI program, Sequel Pro. That works great. But I want to script some queries, and Sequel Pro is not scriptable. What should I do? I've read about tunneling to mysql via SSH. I have shell access to the server, with an SSH key on my Mac, so ssh [email protected] -p 7978 gets me in. Should tunneling the MySQL port 3306 work? Like this? ssh [email protected] -L 3306:127.0.0.1:3306 (It "times out" after a minute.) Do I need to install mysql on my Mac?

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• Quick Outline: Navigating Your PL/SQL Packages in Oracle SQL Developer

  - by thatjeffsmith

  If you’re browsing your packages using the Connections panel, you have a nice tree navigator to click around your packages and your variable, procedure, and functions. Click, click, click all day long, click, click, click while I sing this song… But What if you drill into your PL/SQL source from the worksheet and don’t have the Tree expanded? Let’s say you’re working on your script, something like - Hmm, what goes next again? So I need to reacquaint myself with just what my beer package requires, so I’m going to drill into it by doing a DESCRIBE (via SHIFT+F4), and now I have the package open. The package is open but the tree hasn’t auto-expanded. Please don’t tell me I have to do the click-click-click thing in the tree!?! Just Open the Quick Outline Panel Do you see it? Just right click in the procedure editor – select the ‘Quick Outline’ in the context menu, and voila! The navigational power of the tree, without needing to drill down the tree itself. If I want to drill into my procedure declaration, just click on said procedure name in the Quick Outline panel. This works for both package specs and bodies. Technically you can use this for stand alone procedures and functions, but the real power is demonstrated for packages.

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• How to start/stop service with Apache2 on Ubuntu

  - by user142512

  Using Apache, I'd like to be able to start and stop a service on the same server. Essentially, I'm looking for a way to allow Apache (or some script called by Apache) to call sudo service XXXX start. I realize there are severe security implications with this, and I'm looking to minimize the possible effects. There is only a single service that I need to do this for. I've seen some solutions that involve "hacking" the setuid (C/Perl wrapper), others involved editing the /etc/sudoers file. Is there a better way? many thanks, S.

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• PostgreSQL has no service name on CentOS

  - by Kyle MacFarlane

  I installed PostgreSQL in a pretty standard way on CentOS 5.5: rpm -ivh http://yum.pgrpms.org/reporpms/9.0/pgdg-centos-9.0-2.noarch.rpm yum install postgresql90-server postgresql90-contrib chkconfig postgresql-90 on /etc/init.d/postgresql-90 initdb But for some reason I can't use it with the service command because it has no name, .e.g if I do service --status-all I get back the following: master (pid 3095) is running... (pid 3009) is running... rdisc is stopped Or even just /etc/init.d/postgresql-90 status: (pid 3009) is running... So how can I give it a name so that I don't have to type out the whole init script path each time?

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• OSX 10.6 Give Apache2 read&write access to mounted windows share

  - by JohEngstrom

  On Mac OS X Snow Leopard I'm trying to give the apache2 user _www full rights to a mounted hidden windows server share. I've used Connect to Server with smb://servername/share$ and saved the username/password in the keychain. The domain username used for the mount got full rights to the share on the windows server. It all works this far. I can browse and edit the files in the share from the Mac. However I can't find a way to give the apache2 user _www rights to write to the mounted share. I have a perl script that is supposed to create a file in the mounted folder but only get permission denied. I've tried all kinds of chmod and chown but it doesn't change the permissions of the share. Does anyone know how this can be done please?

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• bash completion with aliases

  - by dstarh

  I have a bunch of bash completion scripts set up (mostly using bash-it and some manually setup). I also have a bunch of aliases setup for common tasks like gco for git checkout. Right now I can type git checkout d tab and develop is completed for me but when I type gco d tab it does not complete. I'm assuming this is because the completion script is completing on git and it fails to see gco. Is there a way to generically/programmatically get all of my completion scripts to work with my aliases? Not being able to complete when using the alias kind of defeats the purpose of the alias.

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• Progressive Enhancement vs. Single Page Apps

  - by SeanPlusPlus

  I just got back from a conference in Boston called An Event Apart. A really popular theme amongst the speakers was the idea of progressive enhancement - a site's content should go in the HTML, and JavaScript should only be used to enhance behavior. The arguments that the speakers gave for progressive enhancement were very compelling. Not only is it a solid pattern for supporting older browsers, and devices on a network with low bandwidth, but HTML fails much more gracefully than JavaScript (i.e. markup that is not supported is just ignored, while if a browser throws an exception while executing your script - you are hosed). Jeremy Keith gave a particularly insightful talk about this. But what about single page web apps like Backbone and Angular? The whole design behind these frameworks seems to push the developer toward moving content out of the HTML, and into something like a JSON API. I can not seem to gel these two design patterns: progressive enhancement vs. single page web apps. Are there instances when one is better than the other? Or are they not even antagonistic technologies, and I am missing something here with my mental model?

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