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• Recommended programming language for linux server management and web ui integration

  - by Brendan Martens

  I am interested in making an in house web ui to ease some of the management tasks I face with administrating many servers; think Canonical's Landscape. This means doing things like, applying package updates simultaneously across servers, perhaps installing a custom .deb (I use ubuntu/debian.) Reviewing server logs, executing custom scripts, viewing status information for all my servers. I hope to be able to reuse existing command line tools instead of rewriting the exact same operations in a different language myself. I really want to develop something that allows me to continue managing on the ssh level but offers the power of a web interface for easily applying the same infrastructure wide changes. They should not be mutually exclusive. What are some recommended programming languages to use for doing this kind of development and tying it into a web ui? Why do you recommend the language(s) you do? I am not an experienced programmer, but view this as an opportunity to scratch some of my own itches as well as become a better programmer. I do not care specifically if one language is harder than another, but am more interested in picking the best tools for the job from the beginning. Feel free to recommend any existing projects that already integrate management of many systems into a single cohesive web ui, except Landscape (not free,) Ebox (ebox control center not free) and webmin (I don't like it, feels clunky and does not integrate well with the "debian way" of maintaining a server, imo. Also, only manages one system.) Thanks for any ideas! Update: I am not looking to reinvent the wheel of systems management, I just want to "glue" many preexisting and excellent tools together where possible and appropriate; this is why I wonder about what languages can interact well with pre-existing command line tools, while making them manageable with a web ui.

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• Bash - read as a fallback to $@

  - by user137369

  I have a working bash script (working on OSX) that takes files and directories as input and does something like for inputFile in $@ do [someStuff] done but I want to provide a “fallback”, meaning, if the script is started with no arguments (double-clicked, for example), it can take input at that time, by letting the user drop the files directly on the terminal (possibly through read but not mandatory, I'm open to better/different solutions). I'm guessing I should use some kind of if statement, but I'm not sure how. I'd like to not have to essentially duplicate the script's size by two by repeating [someStuff] for each case. Thank you.

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• 'ttest' function not working in Matlab

  - by Harpreet

  When I am using this statement in Matlab in my computer then its giving error as follow: [h,p,ci]=ttest(randn(100,1),0.1) Error: ??? Error using ==> nanmean Too many input arguments. Error in ==> ttest at 104 xmean = nanmean(x,dim); However if I use the same statement in Matlab in another computer, then its working fine and giving results. Do you know what could be the problem? I am posting this question here suspecting it to be some software problem with Matlab. Correct me if I am wrong.

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• Properties!Details (run-time length)

  - by user33666

  When you take clips and turn them into computer playable files, whether .TS or .MOV or .MPG, .MP4, .VOB, etc., do you as the producer actually manually write into some field in a "Details" section of your video editor what the video length is, so that it can be read by the eventual user's video player? Or is this activity performed automatically by the video editor? I'm asking because: when a mouse is passed over a file line item in Windows 7 Shell (Windows Explorer) a little box is displayed where the mouse meets the file line item and provides simple name and size properties, one of which (if it's a media file) is run length. How does that figure get there into the file (later to be read be Windows or OS X)? Thanks for any info.

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• Django + gunicorn + virtualenv + Supervisord issue

  - by Florian Le Goff

  Dear all, I have a strange issue with my virtualenv + gunicorn setup, only when gunicorn is launched via supervisord. I do realize that it may very well be an issue with my supervisord and I would appreciate any feedback on a better place to ask for help... In a nutshell : when I run gunicorn from my user shell, inside my virtualenv, everything is working flawlessly. I'm able to access all the views of my Django project. When gunicorn is launched by supervisord at the system startup, everything is OK. But, if I have to kill the gunicorn_django processes, or if I perform a supervisord restart, once that gunicorn_django has relaunched, every request is answered with a weird Traceback : (...) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/__init__.py", line 77, in connection = connections[DEFAULT_DB_ALIAS] File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 92, in __getitem__ backend = load_backend(db['ENGINE']) File "/home/hc/prod/venv/lib/python2.6/site-packages/Django-1.2.5-py2.6.egg/django/db/utils.py", line 50, in load_backend raise ImproperlyConfigured(error_msg) TemplateSyntaxError: Caught ImproperlyConfigured while rendering: 'django.db.backends.postgresql_psycopg2' isn't an available database backend. Try using django.db.backends.XXX, where XXX is one of: 'dummy', 'mysql', 'oracle', 'postgresql', 'postgresql_psycopg2', 'sqlite3' Error was: cannot import name utils Full stack available here : http://pastebin.com/BJ5tNQ2N I'm running... Ubuntu/maverick (up-to-date) Python = 2.6.6 virtualenv = 1.5.1 gunicorn = 0.12.0 Django = 1.2.5 psycopg2 = '2.4-beta2 (dt dec pq3 ext)' gunicorn configuration : backlog = 2048 bind = "127.0.0.1:8000" pidfile = "/tmp/gunicorn-hc.pid" daemon = True debug = True workers = 3 logfile = "/home/hc/prod/log/gunicorn.log" loglevel = "info" supervisord configuration : [program:gunicorn] directory=/home/hc/prod/hc command=/home/hc/prod/venv/bin/gunicorn_django -c /home/hc/prod/hc/gunicorn.conf.py user=hc umask=022 autostart=True autorestart=True redirect_stderr=True Any advice ? I've been stuck on this one for quite a while. It seems like some weird memory limit, as I'm not enforcing anything special : $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited Thank you.

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• What steps can you take to ensure sane build environments when compiling software?

  - by Chris Adams

  Hi guys, I've been stuck with a compilation problem when building a standardised virtual machine on CentOS 5.4, and I'm in the dark here as to a) why this error is occurring, and b) how to fix it, and in the hope that someone else stumbles across this problem too, I'm hoping someone can help me find the solution here. I'm getting a configure: error: newly created file is older than distributed files! error when trying to compile Ruby Enterprise like below when I try to run the installer, and the solutions offered to on the forums (of checking the tine, and touching the files to update the time associated with them) don't seem to be helping here. What steps can I take to work out what the cause of this problem? [vagrant@vagrant-centos-5 ruby-enterprise-1.8.7-2009.10]$ sudo ./installer Welcome to the Ruby Enterprise Edition installer This installer will help you install Ruby Enterprise Edition 1.8.7-2009.10. Don't worry, none of your system files will be touched if you don't want them to, so there is no risk that things will screw up. You can expect this from the installation process: 1. Ruby Enterprise Edition will be compiled and optimized for speed for this system. 2. Ruby on Rails will be installed for Ruby Enterprise Edition. 3. You will learn how to tell Phusion Passenger to use Ruby Enterprise Edition instead of regular Ruby. Press Enter to continue, or Ctrl-C to abort. Checking for required software... * C compiler... found at /usr/bin/gcc * C++ compiler... found at /usr/bin/g++ * The 'make' tool... found at /usr/bin/make * Zlib development headers... found * OpenSSL development headers... found * GNU Readline development headers... found -------------------------------------------- Target directory Where would you like to install Ruby Enterprise Edition to? (All Ruby Enterprise Edition files will be put inside that directory.) [/opt/ruby-enterprise] : -------------------------------------------- Compiling and optimizing the memory allocator for Ruby Enterprise Edition In the mean time, feel free to grab a cup of coffee. ./configure --prefix=/opt/ruby-enterprise --disable-dependency-tracking checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... configure: error: newly created file is older than distributed files! Check your system clock This is a virtual machine running on virtualbox, and the time of the host and the virtual machine are identical, and up to date. I've also tried running this after updating time with an ntp-client, so no avail. I tried this after reading this post here of someone having a similar problem [vagrant@vagrant-centos-5 ruby-enterprise-1.8.7-2009.10]$ date Tue Apr 27 08:09:05 BST 2010 The other approach I've tried is to touch the top level the files in the build folder like suggested here, but this hasn't worked either (an to be honest, I'm not sure why it would have worked either) [vagrant@vagrant-centos-5 ruby-enterprise-1.8.7-2009.10]$ sudo touch ruby-enterprise-1.8.7-2009.10/* I'm not sure what I can do next here - the problem seems to be the bash configure script that returns this error error: newly created file is older than distributed files!, at line :2214 { echo "$as_me:$LINENO: checking whether build environment is sane" >&5 echo $ECHO_N "checking whether build environment is sane... $ECHO_C" >&6; } # Just in case sleep 1 echo timestamp > conftest.file # Do `set' in a subshell so we don't clobber the current shell's # arguments. Must try -L first in case configure is actually a # symlink; some systems play weird games with the mod time of symlinks # (eg FreeBSD returns the mod time of the symlink's containing # directory). if ( set X `ls -Lt $srcdir/configure conftest.file 2> /dev/null` if test "$*" = "X"; then # -L didn't work. set X `ls -t $srcdir/configure conftest.file` fi rm -f conftest.file if test "$*" != "X $srcdir/configure conftest.file" \ && test "$*" != "X conftest.file $srcdir/configure"; then # If neither matched, then we have a broken ls. This can happen # if, for instance, CONFIG_SHELL is bash and it inherits a # broken ls alias from the environment. This has actually # happened. Such a system could not be considered "sane". { { echo "$as_me:$LINENO: error: ls -t appears to fail. Make sure there is not a broken alias in your environment" >&5 echo "$as_me: error: ls -t appears to fail. Make sure there is not a broken alias in your environment" >&2;} { (exit 1); exit 1; }; } fi ### PROBLEM LINE #### # this line is the problem line - this is returned true, sometimes it isn't and I can't # see a pattern that that determines when this will test will pass or not. test "$2" = conftest.file ) then # Ok. : else { { echo "$as_me:$LINENO: error: newly created file is older than distributed files! Check your system clock" >&5 echo "$as_me: error: newly created file is older than distributed files! Check your system clock" >&2;} { (exit 1); exit 1; }; } fi the thing that makes this really frustrating is that this script works sometimes, when the VM has been running for an hour or so it works, but not at boot. There's nothing I see in the crontab that suggests any hourly tasks are run that might change the state of the system enough make a difference to this script working. I'm totally at a loss when it comes to debugging beyond here. What's the best approach to take here? Thanks

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• How to set password for phpMyAdmin with default install of WAMP2?

  - by Danjah

  I just installed it fresh, previously there would be no password at all and I'd be prompted to set one for security purposes, this time I'm just hit with an error: "Cannot connect: invalid settings. phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server." I've changed nothing, but I did install over the top of an older version of WAMP2. That older install did not have a root password. Please don't hit me, but if there's a text fie I can update somewhere instead of getting a cmd line action wrong... I'd really like to be pointed in that direction. I've just tried editing 'my.ini' and uncommented the password line out, so password is blank, but no luck. I don't mind setting a password and such, but right now I just want to get up and running, password or no.

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• Search for and print only matched pattern

  - by Ayman

  I have some huge xml text files. I need to write a script to find and print a specific tag only. I tried sed and grep but they both return the whole line. Using SunOS 5.x, so not all linux commands may work. grep -o is not available. The 'xml' file is not actually one huge xml document, but each line is a separate xml document, with just a few tags, not even nested. And the structure is fairly easy, so full xml parsers is not needed, and probably would not work. I was looking for sed, awk, or some other one liners, but could not get them to work, and they are both relatively new to me.

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• Using LDAP to store customer data

  - by mechcow

  We wish to store some data in 389 Directory Server LDAP that doesn't fit that well into the standard set of schema's that come with the product. Nothing too amazing, things like: when the customer joined are they currently active customer certificate[1] which environment they are using My question is this: should we register with OID and start writing up our own custom schema OR is there a standard schema definition not provided by Directory Server that we can download and use that would fit our needs? Should we munge/hack existing attributes and store the data among there (I'm strongly opposed to this, but would be interested in arguments about why its better than extending)? [1] I know there is a field for this userCertificate but we don't want to use it to authenticate the user for the purposes of binding Using CentOS 5.5 with 389 Directory Server 8.1

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• How do I use postfix aliases in cyrus?

  - by Nick

  I have a cyrus mailbox called user/nrahl. If I use the 'mail' command, from the server itself, and type: mail nrahl to send a message, the message magically shows up in my Thunderbird IMAP inbox. But I need to get message from a POP3 account into Cyrus for delivery, and the messages comming in are addressed to "[email protected]". I have fetchmail setup and running, and it's downloading messages from the POP3 account, and passing them into Postfix. Postfix (now that I've got aliases set up in /etc/alias) is accepting the message, and passing it to the Cyrus socket. But here's the problem: Cyrus is rejecting the message with a 550 - mailbox unknown error. The actual message in /var/log/mail.log is: Apr 17 16:56:57 IMAP cyrus/lmtpunix[5640]: verify_user(user.fetchmail) failed: Mailbox does not exist Apr 17 16:56:57 IMAP postfix/lmtp[5561]: CFFD61556BD: to=, relay=localhost[/var/run/cyrus/socket/lmtp], delay=0.08, delays=0.07/0/0/0.01, dsn=5.1.1, status=bounced (host localhost[/var/run/cyrus/socket/lmtp] said: 550-Mailbox unknown. Either there is no mailbox associated with this 550-name or you do not have authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command)) It looks like it's trying to forward all of nrahl's mail to postfix@localhost, instead of nrahl@localhost, and I don't know why. I need it to forward mail addressed to [email protected] into Cyrus's "nrahl" mailbox.

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• Powershell: Execute exe on remote server and capture output

  - by user364825

  I am trying to script the execution of an installer on remote web servers. The installer in question is also a Windows Service that hosts NServiceBus. If RDP'd into the server, the application is installed by the following command: &"$theInstaller" /install /serviceName:TheServiceName The installer prints output about its progress registering the service and connecting to the database to stdout, among other things. This works fine from an RDP session, but when I execute it remotely via PS, I get a you-can't-do-this-over-the-network message if I execute it directly or via Invoke-Command -computername $theRemoteServer: System.IO.FileLoadException: Could not load file or assembly 'file://\\theRemoteServer\c$ \thePath\AutoMapper.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) --- System.NotSupportedException: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information. (Note: I added an additional "\" to the path in the first line in order to get it to show up correctly in the preview on this site.) This, and other DLLs, are loaded by the service, and the service's execution context cannot, apparently, be remotified. I have also tried using Invoke-WmiMethod, which does something, but it's not clear what, and the output from the installer is lost: Invoke-WMIMethod win32_process create '"$theInstaller" /install /serviceName:TheServiceName' -ComputerName $server (with and without cmd.exe /k before the intaller reference): __GENUS : 2 __CLASS : __PARAMETERS __SUPERCLASS : __DYNASTY : __PARAMETERS __RELPATH : __PROPERTY_COUNT : 2 __DERIVATION : {} __SERVER : __NAMESPACE : __PATH : ProcessId : ReturnValue : 9 How does one remotely execute such an EXE and capture the output? Thanks!

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• Drop database on DB2 9.5 - SQL1035N The database is currently in use

  - by Tommy

  I've never got this working the first time, but now I can't seem to do i at all. There is a connection pool somewhere using the database, so trying to drop the database when an application is using the database should give this error. The problem is there are no connection to the database when I issue these commands: db2 connect to mydatabase db2 quiesce database immediate force connections db2 connect reset db2 drop database mydatabase This allways give: SQL1035N The database is currently in use. SQLSTATE=57019 running this command shows no connections/applications DB2 list applications I can even deactivate the database, but still can't drop it. db2 => deactivate database mydatabase DB20000I The DEACTIVATE DATABASE command completed successfully. db2 => drop database mydatabase SQL1035N The database is currently in use. SQLSTATE=57019 db2 => Anyone got any clues? I'm running the cmd-windows as the local administrator (windows 2008) and this is also the admin for DB2. The connectionpool-user cannot connect during quiesce-state.

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• How do I stop MSYS from transforming my compiler options?

  - by Carl Norum

  Is there a way to stop MSYS/MinGW from transforming what it thinks are paths on my command lines? I have a project that's using nmake & Microsoft Visual Studio 2003 (yeecccch). I have the build system all ported and ready to go for GNU make (and tested with Cygwin). Something weird is happening to my compiler flags when I try to compile in an MSYS environment, though. Here's a simplified example: $ cl /nologo Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 13.10.6030 for 80x86 Copyright (C) Microsoft Corporation. All rights reserved. /out:nologo.exe C:/msys/1.0/nologo LINK : fatal error LNK1181: cannot open input file 'C:/msys/1.0/nologo.obj' As you can see, MSYS is transforming the /nologo compiler switch into a windows path, and then sending that to the compiler. I really don't want this to happen - in fact I'd be happy if MSYS never transformed any paths - my build system had to take care of all that when I first ported to Cygwin. Is there a way to make that happen? It does work to change the command to $ cl -nologo Which produces the expected results, but this build system is very large and very painful to update. I really don't want to have to go in and change every use of a / for a flag to a -. In particular, there may be tools that don't support the use of the - at all, and then I'll really be stuck. Thanks for any suggestions!

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• Puppetmaster don't notice changes to site.pp

  - by tore-

  I've just setup a new production environment with puppet. Using 0.25.4 in client/server. Ruby is at 1.8.5, CentOS 5.4. I've made a simple manifest for configuring yum-updatesd, but the puppetmaster doesn't seem to notice changes done to site.pp: err: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 err: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not parse for environment production: Could not match 'node' at /etc/puppet/manifests/site.pp:1 Notice, it says line 1. But line 1 contains an import statement: # cat -n /etc/puppet/manifests/site.pp 1 import "update-notification" 2 3 node default { 4 include update-notification 5 update-notification::configure() 6 } I've tried to reboot the server, delete and recreate site.pp, start and stop puppetmaster and puppet, with no luck. What am I missing?

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• Understanding what needs to be in place for a server to send outgoing email from a linux box

  - by Matt

  I am attempting to configure an openSuse 11.1 box to send outgoing email for a domain that the same server is hosting. I don't understand enough about smtp servers and the like to know what needs to be in place and working. The system already had Postfix installed, and I confirmed it was running via a > sudo /etc/init.d/postfix status I examined the Postfix config file in /etc/main.cf and configured a couple of items regarding the domain/host name and such, but left it largely default. I attempted to send an email from the command line with the following command: > echo "test 123" | mail -s "test subject" [email protected] Where differentdomain.com was not the same domain as the one best hosted on the server. However, the email never reaches the target account. Any suggestions? EDIT: In the postfix log, (/var/log/mail.info, there's nothing in .err) I see that postfix is trying to connect to what appears to be a different smtp server on our network, with a connection refused: connect to ourdomain.com.inbound15.mxlogic.net[our ip address]:25: Connection refused However, I can't figure out why it is 1) trying to connect to that server and 2) not just sending the messages itself... I mean, isn't postfix an smtp server? I did a grep -ri on ourdomain from /etc and see no configuration files anywhere telling it to do this. Why is it?

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• Mac Port error installing gsoap

  - by Kevin

  Hi All, I have installed Mac Ports V1.8.1 no worries. I ran sudo port -v selfupdate no worries. I ran sudo port install gsoap And get the following error message. --- Computing dependencies for gsoap --- Fetching gsoap --- Attempting to fetch gsoap_2.7.13.tar.gz from http://optusnet.dl.sourceforge.net/gsoap2 --- Verifying checksum(s) for gsoap --- Extracting gsoap --- Applying patches to gsoap --- Configuring gsoap Error: Target org.macports.configure returned: configure failure: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_gsoap/work/gsoap-2.7" && ./configure --prefix=/opt/local --enable-samples " returned error 77 Command output: checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... no checking for mawk... no checking for nawk... no checking for awk... awk checking whether make sets $(MAKE)... no checking build system type... i386-apple-darwin10.2.0 checking host system type... i386-apple-darwin10.2.0 checking whether make sets $(MAKE)... (cached) no checking for C++ compiler default output file name... configure: error: C++ compiler cannot create executables See `config.log' for more details. Error: Status 1 encountered during processing. Any ideas as to why it is failing. Regards Kevin

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• Port-forwarding on livebox to router

  - by Yusuf

  Hello, At home, I have two routers, one Livebox and a Netgear. The reason why I need the Livebox is that the phone line cannot be connected to the Netgear router. So I have the Livebox connected to the phone line, the Netgear connected to the Livebox, and all PCs connected to the Netgear. My issue is that for every application or port that I want to give external access, I have to create entry in both the Livebox and the Netgear routers; so I would like to know if there's a way to automatically forward all requests to the Netgear router, from which I will then forward to the required IP:port. Thanks in advance.

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• os x 10.4 server enable mail for account via terminal

  - by Chris

  Hello- I have an account on an OS X 10.4 server that I don't have physical access to (must use SSH). For arguments sake, let's call the account 'Bob'. Bob's account exists and appears to be fully functional, however he does not have email. How do I enable, via terminal, email for Bob's account, such that he can receive email at [email protected]? I already have the mail server all set up with several working accounts in it, I just need to add Bob. I have searched all over Google for over six hours now, but can't seem to find an answer that fits my situation. Any help is appreciated. P.S. - I am not adverse to just deleting the account and starting over, if that would make things easier...

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• Routing WIFI and LAN for specific traffic

  - by jakebird451

  I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2.10 as a static IP. Does not connect to a router, only a switch for direct routing connection. I have 4 IP addresses I need to access on the LAN: 192.168.2.1 192.168.2.21 192.168.2.20 192.168.2.30 The rest of the traffic needs to go to WIFI. I have tried setting up a routing table for the specific ip addresses, but I only managed to mess up my network. I do not venture out into the world of networking too often, but this was the latest command I have been trying: sudo route add -host 192.168.2.30 -interface en0 This command killed my ability to use ping. It told me that ping could not allocate memory (is that even possible)? It also killed my wifi access. Logging out and back in fixed the issue. I really do not mind to make this solution permanent, so I am fine with a temporary routing. EDIT: If I currently have been trying: sudo route flush sudo route add default 192.168.19.1 This gets everything to work for about a minute. But after such minute it "forgets" the routing to WiFi while retaining LAN's (en0) routing. If I unplug and replug my LAN (en0) cable, the process works for another minute.

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• Create Windows AMI with instance storage

  - by Jonathan Oliver

  I have a business use case and workflow where local/instance/ephemeral storage for an EC2 instance is ideal. Unfortunately I'm coupled to a Windows platform for this particular task and the EC2 Windows offering appears to have some deficiencies related to AMI creation. In essence, I'm trying to figure out if there's a way to attach local instance storage to a Windows EC2 instance using the typical command line interface (because the Amazon Website GUI doesn't support it) and then to somehow create an AMI based upon that. I've tried creating a snapshot and then creating a Windows AMI based upon the snapshot, but of course the docs say this is unsupported and makes an unbootable AMI. In short, here's what I'm trying to do: Be able to run a Windows instance (EBS/S3 instance doesn't matter) Attach local instance storage as drive D: Persist that configuration as an AMI such that I can start lots of them as necessary from either the GUI, command line, or REST API. Be able to take a launched instance, update software, shutdown, and create another AMI based upon that. Wash, rinse, repeat. One other potential option which isn't horrible, but isn't ideal is to create an AMI which has 2 EBS volumes already attached (system+apps and data). Essentially, every time I startup an instance based upon the AMI it'll create 2 new EBS volumes of pre-determined size. I'm trying to avoid that scenario if possible.

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• Squid - Active Directory - permissions based on Nodes rather than Groups

  - by Genboy

  Hi, I have squid running on a gateway machine & I am trying to integrate it with Active Directory for authentication & also for giving different browsing permissions for different users. 1) /usr/lib/squid/ldap_auth -b OU=my,DC=company,DC=com -h ldapserver -f sAMAccountName=%s -D "CN=myadmin,OU=Unrestricted Users,OU=my,DC=company,DC=com" -w mypwd 2) /usr/lib/squid/squid_ldap_group -b "OU=my,DC=company,DC=com" -f "(&(sAMAccountName=%u)(memberOf=cn=%g,cn=users,dc=company,dc=com))" -h ldapserver -D "CN=myadmin,OU=Unrestricted Users,OU=my,DC=company,DC=com" -w zxcv Using the first command above, I am able to authenticate users. Using the second command above, I am able to figure out if a user belongs to a particular active directory group. So I should be able to set ACL's based on groups. However, my customer's AD setup is such that he has users arranged in different Nodes. For eg. He has users setup in the following way cn=usr1,ou=Lev1,ou=Users,ou=my,ou=company,ou=com cn=usr2,ou=Lev2,ou=Users,ou=my,ou=company,ou=com cn=usr3,ou=Lev3,ou=Users,ou=my,ou=company,ou=com etc. So, he wants that I have different permissions based on whether a user belongs to Lev1 or Lev2 or Lev3 nodes. Note that these aren't groups, but nodes. Is there a way to do this with squid? My squid is running on a debian machine.

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• Time not propagating to machines on Windows domain

  - by rbeier

  We have a two-domain Active Directory forest: ourcompany.com at the root, and prod.ourcompany.com for production servers. Time is propagating properly through the root domain, but servers in the child domain are unable to sync via NTP. So the time on these servers is starting to drift, since they're relying only on the hardware clock. WHen I type "net time" on one of the production servers, I get the following error: Could not locate a time-server. More help is available by typing NET HELPMSG 3912. When I type "w32tm /resync", i get the following: Sending resync command to local computer The computer did not resync because no time data was available. "w32tm /query /source" shows the following: Free-running System Clock We have three domain controllers in the prod.ourcompany.com subdomain (overkill, but the result of a migration - we haven't gotten rid of one of the old ones yet.) To complicate matters, the domain controllers are all virtualized, running on two different physical hosts. But the time on the domain controllers themselves is accurate - the servers that aren't DCs are the ones having problems. Two of the DCs are running Server 2003, including the PDC emulator. The third DC is running Server 2008. (I could move the PDC emulator role to the 2008 machine if that would help.) The non-DC servers are all running Server 2008. All other Active Directory functionality works fine in the production domain - we're only seeing problems with NTP. I can manually sync each machine to the time source (the PDC emulator) by doing the following: net time \\dc1.prod.ourcompany.com /set /y But this is just a one-off, and it doesn't cause automated time syncing to start working. I guess I could create a scheduled task which runs the above command periodically, but I'm hoping there's a better way. Does anyone have any ideas as to why this isn't working, and what we can do to fix it? Thanks for your help, Richard

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• Is there any way to detect when nginx has completed a graceful shutdown?

  - by Daniel Vandersluis

  I have a ruby on rails application which is running on passenger and nginx, with one main webserver and multiple application servers. I am trying to update my deployment process in order to minimize (or ideally, remove) any downtime caused by the deployment. The main roadblock right now is that passenger takes some time to restart (ie. reload the application), so in order to get around this, I want to stagger my restarts so that only one app server gets restart at a time. In order to do this without losing any long running passenger processes, I am thinking I need to gracefully shutdown the app server's nginx instance, which will cause it to no longer accept new connections but continue to process the existing ones; as well, HAProxy will detect that the app server is down and route new requests to the other server. However, assuming that there is a long-running process, I am not sure how to detect when the graceful shutdown has completed so that I can start it back up. Since the shutdown is caused by sending a signal (ie. kill -QUIT $( cat /var/run/nginx.pid )), and the kill command will return immediately, I cannot combine commands (ie. kill ... && touch restarted), as the touch command will execute immediately, even if nginx hasn't completed its shutdown. Is there any good way to do this?

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• Batch file reads in text file and replaces quotes with variables into new file?

  - by John

  I have customer Pizza lists that i have saved into 5 seperate txt files from my database in this format: Filename = 25Percent.TXT "555-1211" "555-1212" "555-1223" ... ect Each list is a phone number in quotes and each list varies in length. Part 1: I have two sets of variables that i would like to replace with each quote in the 5 text files. The two variables would be like: Var A = < Discount Pizza price for phone number is " Var B = " 25 % So i would like to run a batch file that reads each line in the text file and writes into another text file the following, replacing the quotes with the variables: New Filename = 25Percentfinished.TXT < Discount Pizza price for phone number is "555-1211" 25 % < Discount Pizza price for phone number is "555-1212" 25 % < Discount Pizza price for phone number is "555-1223" 25 % Then I would repeat for 30percent.txt, then 35percent.txt, 40percent.txt, and then finally 50percent.txt file. Part II: I would also like to append the 5 new files together, with the append command? I am assuming that the SET Var command would also be used? Not sure what to do here.

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• Extract large zip file (50 GB) on Mac OS X

  - by chingjun

  I was trying to move the files to another hard drive. So I archived all my photos in one large ZIP file using the Mac OS X built-in compress function. But the file failed to extract. I've tried many programs, but none of the programs I tried were able to extract the file. I've tried Mac OS X's extract utility, StuffIt Expander, 7-Zip (command line), all failed. Mac's archive utility and StuffIt don't seem to support large files, and 7-Zip's command line version gave an error stating unsupported archive. I have no luck in Windows either as many of my files have Chinese filenames, and couldn't extract to the correct name under Windows. Are there some programs that can support large files, can handle files compressed using Mac OS X's compress function, and can support UTF-8 filename? With or without GUI is fine. Update Well, I had made the wrong decision to compress the files, and it's already too late. I thought I should be able to extract the file if I could compress it. It's too late, the original copies are gone, only a large ZIP file left here. I have tried using 'unzip', but it says End-of-central-directory signature not found. I guess it doesn't have large file support as well. I would try the Windows Vista method as stated by SuperMagic, but I need to borrow a computer for that. Anyway, thank you everyone, but please provide more suggestions on what software that could possibly extract that file.

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