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• Fake serial communication under Linux

  - by kigurai

  I have an application where I want to simulate the connection between a device and a "modem". The device will be connected to a serial port and will talk to the software modem through that. For testing purposes I want to be able to use a mock software device to test send and receive data. Example Python code device = Device() modem = Modem() device.connect(modem) device.write("Hello") modem_reply = device.read() Now, in my final app I will just pass /dev/ttyS1 or COM1 or whatever for the application to use. But how can I do this in software? I am running Linux and application is written in Python. I have tried making a FIFO (mkfifo ~/my_fifo) and that does work, but then I'll need one FIFO for writing and one for reading. What I want is to open ~/my_fake_serial_port and read and write to that. I have also lpayed with the ptymodule, but can't get that to work either. I can get a master and slave file descriptor from pty.openpty() but trying to read or write to them only causes IOError Bad File Descriptor error message.

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• Why are my USB 2.0 devices hanging Windows XP?

  - by BenAlabaster

  Background on the machine I'm having a problem with: The machine was inherited and appears to be circa 2003 (there's a date stamp on the power supply which leads me to this conclusion). I've got it set up as a Skype terminal for my 2 year old to keep in touch with her grandparents and other members of the family - which everyone loves. It has a generic ATX motherboard with no identifying markings other than one stamp that says "Rev.B". CPU-Z identifies the motherboard model as VT8601 but doesn't provide me with any manufacturer name. On board it has 1 x 10/100 LAN, 2 x USB 1.0, VGA, PS/2 for KB and mouse, parallel port, 2 x serial ports, 2 x IDE, 1 x floppy, 2 x SDRAM slots, 1 x CPU housing that is seating a 1.3GHz Intel Celeron CPU, 3 x PCI, 1 x AGP - although you can only use 2 of the PCI slots if you use the AGP slot due to the physical layout of the board. It's got 768Mb PC133 SDRAM - 1 x 512Mb & 1 x 256Mb installed as well as a D-LINK WDA-2320 54G Wi-Fi network card and a generic USB 2.0 expansion board containing 3 x external + 1 x internal USB connectors - it has a NEC uPD720102 chipset. It has a DVD+/-RW running as master on IDE1 and a 1.44Mb 3.5" floppy drive connected to the floppy connector. It has an 80Gb Western Digital hard drive running as master on IDE0. All this is sitting in a slimline case. I don't know the wattage of the PSU, but can post this later if this proves to be helpful. The motherboard is running a version of Award BIOS for which I don't have the version number to hand but can again post this later if it would be helpful. The hard disk is freshly formatted and built with Windows XP Professional/Service Pack 3 and is up to date with all current patches. In addition to Windows XP, the only other software it's running is Skype 4.1 (4.2 hangs the whole machine as soon as it starts up, requiring a hard boot to recover). It's got a Daytek MV150 15" touch screen hooked up to the on board VGA and COM1 sockets with the most current drivers from the Daytek website and the most current version of ELO-Touchsystems drivers for the touch component. The webcam is a Logitech Webcam C200 with the latest drivers from the Logitech website. The problem: If I hook any devices to the USB 2.0 sockets, it hangs the whole machine and I have to hard boot it to get it back up. If I have any devices attached to the USB 2.0 sockets when I boot up, it hangs before Windows gets to the login prompt and I have to hard boot it to recover. Workarounds found: I can plug the same devices into the on board USB 1.0 sockets and everything works fine, albeit at reduced performance. I've tried 3 different kinds of USB thumb drives, 3 different makes/models of webcams and my iPhone all with the same effect. They're recognized and don't hang the machine when I hook them to the USB 1.0 but if I hook them to the USB 2.0 ports, the machine hangs within a couple of seconds of recognizing the devices were connected. Attempted solutions: I've seen suggestions that this could be a power problem - that the PSU just doesn't have the wattage to drive these ports. While I'm doubtful this is the problem [after all the motherboard has the same standard connector regardless of the PSU wattage], I tried disabling all the on board devices that I'm not using - on board LAN, the second COM port, the AGP connector etc. through the BIOS in what I'm sure is a futile attempt to reduce the power consumption... I also modified the ACPI and power management settings. It didn't have any noticeable affect, although it didn't do any harm either. Could the wattage of the PSU really cause this problem? If it can, is there anything I need to be aware of when replacing it or do I just need to make sure it's got a higher wattage than the current one? My interpretation was that the wattage only affected the number of drives you could hook up to the power connectors, is that right? I've installed the USB card in another machine and it works without issue, so it's not a problem with the USB card itself, and Windows says the card is installed and working correctly... right up until I connect a device to it. The only thing I haven't done which I only just thought of while writing this essay is trying the USB 2.0 card in a different PCI slot, or re-ordering the wi-fi and USB cards in the slots... although I'm not sure if this will make any difference - does anyone have any experience that would suggest this might work? Other thoughts/questions: Perhaps this is an incompatibility between the USB 2.0 card and the BIOS, would re-flashing the BIOS with a newer version help? Do I need to be able to identify the manufacturer of the motherboard in order to be able to find a BIOS edition specific for this motherboard or will any version of Award BIOS function in its place? Question: Does anyone have any ideas that could help me get my USB 2.0 devices hooked up to this machine? Edit: Updated the USB 2.0 info with reference to actual card - http://www.xpcgear.com/lpnec4u.html

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• How to run django on localhost with nginx and uwsgi?

  - by user2426362

  How to run django on localhost with nginx and uwsgi? This im my config but not works. nginx: server { listen 80; server_name localhost; access_log /var/log/nginx/localhost_access.log; error_log /var/log/nginx/localhost_error.log; location / { uwsgi_pass unix:///tmp/localhost.sock; include uwsgi_params; } location /media/ { alias /home/user/projects/zt/myproject/myproject/media/; } location /static/ { alias /home/user/projects/zt/myproject/myproject/static/; } } uwsgi: [uwsgi] vhost = true plugins = python socket = /tmp/localhost.sock master = true enable-threads = true processes = 2 wsgi-file = /home/user/projects/zt/myproject/myproject/wsgi.py virtualenv = /home/user/projects/zt chdir = /home/user/projects/zt/myproject touch-reload = /home/user/projects/zt/myproject/reload This config work on my ubuntu server with normal domain (not localhost) but on localhost not working. If I run localhost in web browser I have Welcome to nginx!

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• Harvesting Dynamic HTTP Content to produce Replicating HTTP Static Content

  - by Neil Pitman

  I have a slowly evolving dynamic website served from J2EE. The response time and load capacity of the server are inadequate for client needs. Moreover, ad hoc requests can unexpectedly affect other services running on the same application server/database. I know the reasons and can't address them in the short term. I understand HTTP caching hints (expiry, etags....) and for the purpose of this question, please assume that I have maxed out the opportunities to reduce load. I am thinking of doing a brute force traversal of all URLs in the system to prime a cache and then copying the cache contents to geodispersed cache servers near the clients. I'm thinking of Squid or Apache HTTPD mod_disk_cache. I want to prime one copy and (manually) replicate the cache contents. I don't need a federation or intelligence amongst the slaves. When the data changes, invalidating the cache, I will refresh my master cache and update the slave versions, probably once a night. Has anyone done this? Is it a good idea? Are there other technologies that I should investigate? I can program this, but I would prefer a configuration of open source technologies solution Thanks

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• Hard Drive upgrade advice for a Dell PowerEdge 1950

  - by user8185

  My setup is a Dell PowerEdge 1950 with 2x 140Gb Hard drives in a RAID 1 configuration. The OS is Windows 2003 Web Edition and disk is partitioned into to two, a 12Gb C: partition and the remainder is the D: drive. Both are very close to full capacity. Ideally I want to replace those drives with 2x 1Tb drives while retaining all data. First of all is this possible without rebuilding the server? If so, will I need any 3rd party software, Symantec Ghost, Partition Master for e.g., to do this? Any general advice as to how to go about doing this?

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• No longer able to run photo software on XP

  - by Peter

  I have Olympus Master 2 and Photoimpression 6 on my system which is running with XP Pro. Both programmes ran fine till recently and neither now works. I have run Avira and AVG anti virus (only one loaded at a time), Superantispyware, Spybot and Malwarebytes and removed the usual dross but no help. I have also uninstalled and reinstalled both several times but again no help. Both programmes load but the Olympus one immediately passes to the usual 'its met a problem and needs to close'...Photoimpression loads fully but as soon as I go to the edit screen it gives the same message. I have tried another profile to no avail. Any idea why this is and what the solution is??

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• PHP-FPM runs PHP scripts as root

  - by fwalch

  I have a web server setup using nginx and PHP-FPM listening on a Unix socket. In my php-fpm.conf, I have specified user = www group = www When I run ps aux, I can see that the php-fpm worker processes run as www; the php-fpm master process runs as root. However, I noticed that PHP scripts are executed as root; at least that's the output of echo get_current_user(); What can I do to run scripts as the www user? How can this even happen if the worker processes run as www?

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• Looking for internet traffic manager software for Windows 7

  - by Semyon Perepelitsa

  I have 128 KB/s (1 Mbit/s) internet connection. Not quite fast for downloading big files, but it is okay for internet browsing. When I start big file dowload, I cannot surf the web normally: pages appears slowly, especially pictures there. Therefore I pause downloading, but I'm regularly spending much time on reading articles or leaving the computer alone, when I can allow the file being dowloaded. Is there any software that can automize the process of pausing and resuming download or simply automatically regulate internet speed for each application using Internet? I download files using different software and protocols (Download Master for http, ftp; uTorrent for torrents; many other programs for updating themselves), so I don't want to be tied to particular program for downloading.

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• uWSGI and python virtual env

  - by user27512

  I'm trying to use uWSGI with a virtual env in order to use the Trac bug tracker on it. I've installed system-wide uwsgi via pip. Next, I've installed trac in a virtualenv $ virtualenv venv $ . venv/bin/activate $ pip install trac I've then written a simple uWSGI configuration script: [uwsgi] master = true processes = 1 socket = localhost:3032 home = /srv/http/trac/venv/ no-site = true gid = www-data uid = www-data env = TRAC_ENV=/srv/http/trac/projects/my_project module = trac.web.main:dispatch_request But when I try to launch it, it fails: $ uwsgi --http :8000 --ini /etc/uwsgi/vassals-available/my_project.ini --gid www-data --uid www-data ... Set PythonHome to /srv/http/trac/venv/ ... *** Operational MODE: single process *** ImportError: No module named trac.web.main unable to load app 0 (mountpoint='') (callable not found or import error) I think uWSGI isn't using the virtual env. When inside the virtual env, I can import trac.web.main without having an ImportError. How can I do that ? Thanks

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• Tracking the linux config with git: how?

  - by Pierre

  I'd like to track my linux configurations with git. My idea is to have a branch for each server. /etc is not the only one directory to be tracked (I won't git init in '/etc' ) As far as I could see, it is possible to init a git for a distant directory. I tried this: # mkdir -p /git/.git # cd /git # git --work-tree=/ --git-dir=/git/.git init Initialized empty Git repository in /git/.git/ 1) Creating a new branch before everything is not possible # git branch server1 fatal: Not a valid object name: 'HEAD'. 2) adding a file in master/HEAD is not possible # touch README.md # git add README.md fatal: Unable to create '//.git/index.lock': No such file or directory how should I properly setup git to track my system-config ? Thanks. P.

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• Postfix configuration w.r.t. port 25

  - by Monkey Boson

  After a considerable amount of research, I have configured my postfix server to use dovecot to accept SMTPS connections over port 465 and everything works swimmingly. Unfortunately, I forgot that, unless I listen to port 25, I'm not going to receive any e-mail from the net. I'm hoping somebody knows off the top of their head how to open up port 25 on Postfix for anonymous users, but disallow relaying and any other bad things on that port. And to leave the port 465 the way it is. As to my current configuration, I changed the master.cf file: smtps inet n - n - - smtpd and the main.cf file: # Use our SSL certificates smtpd_tls_cert_file = .....cer smtpd_tls_key_file = .....key smtpd_tls_security_level = may # Use Dovecot for SASL authentication smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_sasl_authenticated, reject_unauth_destination Any help is appreciated!

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• How do I join two worksheets in Excel as I would in SQL?

  - by Joel Coehoorn

  I have two worksheets in two different Excel files. They both contain a list of names and addresses. One is a master list that includes other fields, and the other is a list that only includes name and address and an id column that was pared down by another office. I want to use the 2nd list to filter the first. I know how I could do this very easily with a database inner join, but I'm less clear on how to do this efficiently in Excel. How can join two worksheets in Excel? Bonus points for showing how to do outer joins as well, and I would greatly prefer konwing how to do this without needing a macro.

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• Making audio CDs en mass - Linux based solutions?

  - by The Journeyman geek

  My mom's sings and gives away cds to people. Invariably it falls to me to have to burn cds for her, and burning 50-100 cds on a single drive is a pain. I DO have a handful of cd burners and a slightly geriatric old PIII 450. This is what i want to be able to do - either point an application at a folder of WAV or MP3s, say how many copies i need on CLI (since then i can SSH into the system and use it headless) feed 2 or more CD burners cds until its done, OR pop in a single CD into a master drive and have its contents duplicated to 2 or more burners. I'd rather have it running on linux, be command line based, and be as little work as possible - almost automatic short of telling it how many copies i want would be ideal. I'm sure i'll have people wondering about legality - My mom sings her own music, and its classical, and older than copyright law, so, that's a non issue. I just want a way to make this chore a little easier, short of telling my mom to do it herself.

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• DNS propagation

  - by Paddington

  I have 1 primary DNS server (ns1.mydomain.com) running on Fedora and 2 secondary ones (ns2 and ns3). DNS changes made on my web servers first goes to the primary name server and then propagates to the secondary servers. After making a DNS change on a domain on the web server, I can't see the new dns information on my ns1 when I perform: dig @ns1 A blahblah.com I then went to the master records on the names server (uses named) in the directory /var/named/run-root/var/named/masters and I see the A record has been updated appropriately. Tailing the logs /var/log/messages is not showing any errors. What could be the issue?

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• Setting Rails up on a Linode - Nginx Issue

  - by rctneil

  I am extremely new to this so please don't shoot me down: I have set up a Linode running Ubuntu, It is all sort of working except Nginx. I am following this guide: http://rubysource.com/deploying-a-rails-application/ And this for nginx: http://library.linode.com/web-servers/nginx/installation/ubuntu-10.04-lucid When I go to my IP, I get a 500 internal server error. I have tried starting nginx and it looks like it starts fine. I run this: ps awx | grep nginx and I get: 308 ? Ss 0:00 nginx: master process /usr/sbin/nginx 2309 ? S 0:00 nginx: worker process 2311 ? S 0:00 nginx: worker process 2312 ? S 0:00 nginx: worker process 2313 ? S 0:00 nginx: worker process 2850 pts/0 S+ 0:00 grep --color=auto nginx I really am not sure what else to do to get it running. Any help? Neil

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• Resolving host names to their domain name in an internal BIND domain

  - by Adam Plumb

  I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain (plumbnicoll.family), and can do forward and reverse lookups from other computers in my LAN. For example, host office2.plumbnicoll.family correctly returns office2.plumbnicoll.family has address 192.168.1.3. What I'd like is to be able to resolve just office2 to its address, without needing to put .plumbnicoll.family at the end. Is this possible, or even desirable to do? I'm running a mixed environment at home with both Linux and Windows computers.

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• Replicate portion of an LDAP directory to external server

  - by colemanm

  We're in the process of setting up a Jabber server on Amazon EC2 right now, and we'd like to have our internal users authenticate via LDAP so we don't have to create/manage a separate set of user accounts than the master directory in the office. My question is: is there a way to copy, unidirectionally, a segment of our internal LDAP directory (the user accounts OU) to an external LDAP server and authenticate Jabber against that? We're trying to work around having our externally hosted machines out in the cloud accessing our internal network directly... If we can replicate in one direction only a subset of the user accounts, then if that gets compromised we don't necessarily have a critical security breach into our internal network.

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• Can't Read/Write the Hard disk used in NAS

  - by mgpyone

  I've lately purchased a Synology DS212j and I intended to use my two 3.5" HDs into it. One of them was in used as an external HD. Thus when I install these two unit in NAS, it asked me to formatted in order to used with its format (I think it's ext3?) . I installed the Disks and omit the formatting option. I just got another 3.5" Hard Disk now. I've installed it in the NAS. everything's fine. However, when I take out the (used) HD from the NAS and install back in the standalone casing, I found out that it can't be read from both OSX an Windows 7. I've tried with ext2sd and I only found 2GB portion of the whole 1.5 TB Hard Disk. Here's another reference from EASEUS Partition Master

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• Control cell reference increment when dragging a forumula in Libre Office Calc (3.5)

  - by Chuck

  Using Libre Office Calc (3.5) and have a question. When copying a formula that references cells into multiple empty cells the default is to increment each cell reference by one column or row, depending on the direction that the formula is being drug. A formula '= 1 + A1' drug horizontally changes to '= 1 + B1' when pulled one cell to right and '=1 + A2' when pulled one cell down. Is there a way to control increase the increment of the referenced cell? Is is possible to have a formula '= 1 + A1' that effectively changes to '= 1 + A3' when drug down one cell, '= 1 + A5' when drug down two cells, etc? If it matters, I am trying to take a constantly updating master list of data that is organized by dates (Wednesdays and Saturdays) and create separate spread sheets for each day of the week that can be updated by only pulling down the formula into the next cell. My attempts at using the 'lookup' function, 'offset' function, and creating a sort column in Libre Office Calc are thwarted by my inability to figure out how to get around the single step increment when pulling a formula down into the next cell. Thanks

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• How to use postfix header_checks with zarafa outgoing mail

  - by olvrlrnz

  I'm using zarafa as MDA with postfix. For privacy reasons I want to filter client internal IP-addresses and stuff like this. To do so I've added the following to master.cf: submission inet n - - - - smtpd [...] -o cleanup_service_name=subcleanup [...] and further down the file: subcleanup unix n - - - 0 cleanup -o header_checks=pcre:/etc/postfix/smtp_header_checks which works perfectly for clients delivering their mail through the submission port. But my zarafa is of course not using the submission port to send mail, hence it doesn't hit the subcleanup routine and outgoing mails contain a very nice X-Mailer: Zarafa-exact_version header which is rather unsatisfying. Is there any way to make zarafa use the subcleanup routine? Any help is much appreciated.

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• Simple Windows+Linux server provisioning? Chef/Puppet/Ansible etc

  - by Andrew

  I'm primarily a developer, part time devops; and manage servers here and there for my projects. I want to automate provisioning of web/app/database servers going forward for my projects I manage a mixture of both Windows and Linux servers (VPS, cloud and dedicated) I've looked at investigated Chef/Puppet/Ansible briefly; and I am wanting to find something that: Is easy to learn and understand. I don't want to invest weeks into understanding a complicated piece of tech. Ideally does not require a server ("master server") to hold the configurations Supports provisioning of Windows and Linux servers Comes with suitable documentation to get started Does anyone have any advice on what tool is best suited? Thanks

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• Updating ATI HD 5970 Graphics card - version errors?

  - by user55406

  I'm having an issue...My system specs is: Intel i7 960 6GM Corair XMS RAM ATI HD5970 graphics card Intel dx58so motherboard Cooler Master HAF 922 case 1.5TB Seagate hard drive Windows Vista x86 (32-bit). Here is my issue: when I go to AMD/ATI website to update my graphics card - it doesn't. when I type DxDiag and then click on display it tell me my version is 8.17.0 and its on 10.10.0 for the latest version. How can I get 8.17.0 too 10.10.0? I figure it would have done that after I updated the driver for my graphics card. Thanks.

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• VMWare - Windows XP guest licensing

  - by jcooper

  Hi, If I have a VMWare ESXi server with 4 Windows XP guests running on it, I understand that I need a separate license for each guest. Is there a way to simplify license compliance on these VMs? For example, I want to create a master VM image and boot it 4 times. By default those 4 VMs will have the same Windows activation key installed. Is there a simple solution for this? Or is it ok to do what I've described above provided I have 4 unique license keys on hand in case of audit? thanks!

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• How can I set up an FTP user with a home directory inside another user's home folder?

  - by simon180

  Hi I have an Ubuntu (Hardy) server which I am using to host multiple websites. All of the sites are stored in subfolders of a public_html folder for my main login to the server and accessed via a single SSH account. I now have a website user who wants FTP (or similar) access to enable them to upload various files etc to the directory where their website is situated, however I still need the SSH account to have access to this directory as I may need to make changes using my master account. Basically I want to create an FTP account (I have VSFTPD installed) for a user with the home directory inside my own user account but they should only be able to read/write to this folder or its subfolders but not go further up the directory tree. How can I achieve this? Thanks

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• wifi connection turns off oll the time

  - by er-v

  Hello! I realy need help with one strange problem. I have a wifi network in my appartment with wireless N home router Trendnet tew-652BRP. Everething work fine for three of my laptops, but I have one PC with D-Link DWA-140 adapter. It looses connection 2-3 times in 5 minutes. There is following messages in my system log when it does so: The browser has forced an election on network \Device\NetBT_Tcpip_{9537A5C1-3B43-4C56-B94C-CE69A257C3AD} because a master browser was stopped. The TCP/IP NetBIOS Helper service was successfully sent a stop control. The reason specified was: 0x40030011 [Operating System: Network Connectivity (Planned)] Comment: None The TCP/IP NetBIOS Helper service entered the stopped state. in order of appearence. How can I stop it? I have the latest driver installed.

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