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• Why doesn't Linode ever have to shut down for updates?

  - by Tom Marthenal

  I've been using Linode for over a year now, and, unlike some lesser-known VPS hosts I've used, I've never been required to shut down my VPS by Linode. The only restarts have been ones I've initiated. How do they go for years on end without requiring restarts and with no downtime? Isn't downtime inevitable when upgrading some parts of the host system? Do they simply perform as few updates as possible? This isn't meant to be a Linode-specific question; I am only using them as an example because I have experience with them.

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• username and password for rsync in script

  - by sims

  I'm creating a cron job to keep two dirs in sync. I'm using rsync. I'm running an rsync daemon. I read the manual and it says: RSYNC_PASSWORD Setting RSYNC_PASSWORD to the required password allows you to run authenticated rsync connections to an rsync daemon without user intervention. Note that this does not supply a password to a shell transport such as ssh. USER or LOGNAME The USER or LOGNAME environment variables are used to determine the default username sent to an rsync daemon. If neither is set, the username defaults to 'nobody' I have something like: #!/bin/bash USER=name RSYNC_PASSWORD=pass DEST="server::module" /usr/bin/rsync -rltvvv . $DEST I also tried exporting (dangerous, I know) USER and RSYNC_PASSWORD. I also tried with LOGNAME. Nothing works. Am I doing this correctly?

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• pnp4nagios does not generate perfdata

  - by gonvaled

  I am running nagios2, pnp4nagios-0.6.16 and php 5.2.4-2ubuntu5.19. In my setup, pnp4nagios is correctly generating perfdata, which can be seen via the web interface in graphical form for lots of services. The perfdata directory contains entries of the kind: /usr/local/pnp4nagios/var/perfdata/zeus/Disk_Space_Home.rrd /usr/local/pnp4nagios/var/perfdata/zeus/Disk_Space_Home.xml I have activated performance data for a new nagios service: define serviceextinfo { host_name zeus service_description 450average action_url /pnp4nagios/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$ } This service is generating monitoring data in the format: status_info|perf_data as required for performance gathering. But somehow the performance data related to this service is not being collected by pnp4nagios (no related entries in /usr/local/pnp4nagios/var/perfdata) Are there any pnp4nagios scripts or settings which I could use to debug this?

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• OpenLDAP server logs filled with "TLS negotiation failure"

  - by WildVelociraptor

  I recently migrated an old OpenLDAP setup to a newer server, with a more robust certificate setup. Currently, most hosts are required to verify the cert matches the host: tls_checkpeer yes TLS_REQCERT always In the server logs, there are multiple occurences of: Nov 6 10:45:08 <servername> slapd[1773]: conn=2785646 fd=35 closed (TLS negotiation failure) These errors appear from multiple hosts, but there don't seem to be any issues actually logging into those servers with an LDAP account. Does anyone know what would cause these errors? The server is running Ubuntu 12.04.2, and OpenLDAP version 2.4.28. The cert was generated using GnuTLS.

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• reiserfsck --rebuild-tree failed: Not enough allocable blocks

  - by mojo

  I have a reiserfs volume that required a --rebuild-tree, but is currently failing to complete when I pass it --rebuild-tree. Here is the output that I receive when running it: reiserfsck 3.6.19 (2003 www.namesys.com) # reiserfsck --rebuild-tree started at Mon Oct 26 13:22:16 2009 # Pass 0: # Pass 0 The whole partition (7864320 blocks) is to be scanned Skipping 8450 blocks (super block, journal, bitmaps) 7855870 blocks will be read 0%....20%....40%....60%....80%....100% left 0, 9408 /sec 287884 directory entries were hashed with "r5" hash. "r5" hash is selected Flushing..finished Read blocks (but not data blocks) 7855870 Leaves among those 6105606 Objectids found 287892 Pass 1 (will try to insert 6105606 leaves): # Pass 1 Looking for allocable blocks .. finished 0%....20%....40%....60%....80%....Not enough allocable blocks, checking bitmap...there are 1 allocable blocks, btw out of disk space Aborted I can't mount it, and I can't fsck it. I've tried extending the volume, but that hasn't helped either.

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• Any way to void document upload when user cancels?

  - by Michael Broschat

  We have developed a set of metadata fields for the user to complete during the file upload process (MOSS). What happens is that the user chooses Upload, then specifies the file on his system. Sometimes, when he sees what metadata data is required, he clicks Cancel, knowing that he cannot supply the data at that time. The file uploads, anyway, and is in the library without any attached metadata. Our client finds this unacceptable, but I haven't found a way to cancel the actual upload when the user tells us he no longer wants to do so.

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• Calculate minimum ext3 partition size for certain amount of data

  - by Daniel Beck

  These following ext3 partitions contain identical data. As we can see, the larger the partition size, the more space is required for the same files: Filesystem 1K-blocks Used Available Use% Mounted on /dev/loop11 3965777 561064 3199964 15% [...] /dev/loop19 573029 543843 29186 95% [...] Filesystem Size Used Avail Use% Mounted on /dev/loop11 3.8G 548M 3.1G 15% [...] /dev/loop19 560M 532M 29M 95% [...] Filesystem Inodes IUsed IFree IUse% Mounted on /dev/loop11 1024000 1656 1022344 1% [...] /dev/loop19 1024000 1656 1022344 1% [...] I start with a partition of fixed size that possibly wasted a lot of space and I want to create a partition that is able to hold that data but with (almost) minimal size. How can I reliably calculate that minimal partition size needed for storing a certain amount of data? The amount of data changes over time, and I need to automate these calculations.

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• Proxy Methods for Hosting a Low-Bandwidth Dynamic Website

  - by Casey

  I am building a webcam w/ HTTP server that will be running from a low-bandwith connection. The content on the site will be changing every 5 to 10 minutes. Instead of serving files directly from this connection, are there hosting companies that can act as a public proxy for my site? Therefore, if nobody is using the site, the local internet connection remains idle. And if I receive 1000 hits all at the same time, only one HTTP GET is required, and the hosting company (on a fat pipe) continues serving the other 999 requests? This doesn't sound like a very common usage model, but I feel like this would be the optimal solution to my situation.

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• What contributes to smooth online video streaming?

  - by Wesley

  I had a general question about streaming videos online; in particular, on YouTube. What really is required to smoothly stream videos at 360p or 480p? Then for that HD goodness, what really allows a computer to smoothly stream 720p and 1080p? I'm not too sure whether it's to do with the CPU (speed, # cores, cache size), GPU (chipset, VRAM, memory type) or even HDD (IDE vs SATA). What contributes to the ability to stream regular videos and, furthermore, high-definition videos online?

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• Wireless technology - which is better: more single radio APs or less dual radio APs?

  - by gert_78

  We are currently talking to vendors of wireless solutions for a wireless deployment in a university campus with some 5000 students. One vendor is offering us a Cisco solution with a WLC 5508 controller and 69 2x2 MIMO Dual-band/Dual radio APs (Aironet AP 1042 model) The other vendor is offering us an Aruba solution with a 3600 controller and 96 2x2 MIMO dual band BUT single radio APs (Aruba AP93) Both vendors are charging 82.000 US$ (support, 3y service contracts, switches and additional required options all included of course) The Aruba vendor is trying to convince me that 96 single radio APs will give us more connection/users/capacity then the 69 dual radio APs. I have my doubts about that and since it is my core competence-domain I wanted to ask here the opinion of people that have a more profound knowledge and experience in this area. When you talk to vendors it's often hard to get objective information. So try to answer only if you are sure and please mention it if you are affiliated with one of the vendors. I appreciate all useful help and want to thank you in advance for the effort!

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• Reasonable Location to Install Web Service on Server

  - by Mr. Disappointment

  Firstly, I'm a software developer and not qualified as any kind of system or server expert so I'm looking for advice in order to help me prevent faults on our server. I've written a modular system to carry out certain tasks for us autonomously to prevent us from writing the same old code over and over again. This consists of a Windows Service (.NET), a Web Service (WCF), a shared Class Library, and a Database which will run on a Windows Server 2003. The problem comes, for me, in deployment. Specifically the web service - naturally the local service (and required shared library) are persisted (by default and convention) in the Program Files folder, but storing the web service here just seems absurd to me (even though we'd lock it down to appropriate use only). Should the files be stored some place else all together? Or split them up and store the web service elsewhere?

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• Driver problems with rerunning WIM capture

  - by Tim Brigham

  How do I handle driver problems associated with creating a new WIM file using a previously created image as a base? I am using a custom MDT image which installs Windows 7, Office 2010, etc which was created from a previously deployed base image of Windows 7 + SP 1 + updates. When the driver injection is enabled I receive a group of messages (collected from different logs, screens, etc). If I turn the preinstall driver injection off things work as expected. If I leave it on I receive the following messages. windows cannot install required files 0x80004005 8004004 non zero return code ltiapply rc=31 Unhandled error returned by LTIApply: a device attached to the system is not functioning. (-2147024865 0x8007001F)

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• CentOS (rel6) with default python 2.6, but seperate 3.3.5 installation

  - by Silvertiger

  I have a CentOS server (rel6) that had python installed (2.6), but I needed a few features in 3.3+. I installed 3.3 into a seperate folder and made a symbolic link to execute it: I installed setup tools: yum install python-setuptools I installed a needed module"pandas" easy_install pandas I executed my pyton script, which encountered an error that required i use a newer version I downloaded and installed Python 3.3.5 to it's own folder so as to not override my default python wget http://www.python.org/ftp/python/3.3.5/Python-3.3.5.tar.xz tar xJf ./Python-3.3.5.tar.xz cd ./Python-3.3.5 ./configure --prefix=/opt/python make make install Made s symbolic link to allow me to execute this new python: ln -s /opt/python3.3/bin/python3.3 ~/bin/py The problem is that when I execute the python script with my new py alias, it does not have all the addons needed (explicitly MySQLdb) which the default install does. How do i go about installing the MySQLdb module, or any for that matter, to be reachable or useable for the new Python 3.3.5 installation? Or is there a way to make the current modules in 2.6 available to 3.3.5 as well?

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• How to require a cell input if another cell has a value

  - by Connor

  I'm trying to edit the VBA for one of my workbooks so that If there is a value in column A, then a value for column C is required or else the file won't save, but i'm having some trouble with this. I can get excel to check a cell for any input and require it have input, but I need it to check if a different cell has an input before requiring input. This is because not all of the lines in my spreadsheet will be used all of the time, but some people forget to put very important pieces of information in the spreadsheet which throws some of our balances off. An SKU is entered on the sheet when we switch to a new one, and I want the program to make sure there is an amount of product in a given cell every time a new SKU is entered onto the sheet. Thanks.

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• What is an SSH key?

  - by acidzombie24

  I signed up for github and notice the ssh key option which looked interesting. I originally expected something like an ssl key (name, co name, etc). After going through it i notice i only put a password and it is always myuser@comp-name (this is windows). Why? I thought it was a user/pass id and i can create separate keys for separate purpose for privacy reasons. Now i see i am required to use one to create a repository. Also i see something about a 'private key file' when looking at options. What exactly is an SSH Key and how can i create a separate user without creating a separate login in windows.

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• Bridging a Windows 7 and Ubuntu dual boot inside an OS

  - by matsko

  I have Windows 7 and Ubuntu installed on my local PC. They're both installed on separate partitions on the same machine, and when the computer boots up the user is given the option to choose which one they want to boot use as the OS. This all works fine, but I want to use Windows 7 instead of Ubuntu, I am required to restart the computer and boot up the other OS. Is is possible to use an "inline" tool that will allow to change between both OSs as if they were windows in Windows 7? Which tool would that be? Does anyone know of anything else than Parallels? Also are there any free tools that would do this?. Many Thanks.

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• Which is generally considered faster or best practice: symlinks or Apache aliases?

  - by Christopher W. Allen-Poole

  I'm curious as to what most people's views are on this subject. Personally, I will almost always prefer symlinks unless I have no other option -- I find that it is far more obvious when someone is navigating the file system, but, on the other hand aliasing is more platform independent. Windows XP, for example, doesn't have anything remotely comparable to symlinks (NTFS junctions are not interpreted correctly by at least some environments), which means that anything which relies on symlinks in a *nix based system cannot be transferred. (I know that Windows 64x OS's have symlinks, but I've not seen if they can be read correctly by the environments previously mentioned) In addition to this, I was also wondering which is considered faster. Is this even possible to know? Do you have a conjecture? I would imagine that since symlinks are generally more low-level than Apache it would make sense that they would be referenced faster, but, on the other hand, I would guess that Apache is required to do a lookup in either case so it would be disk read dependent.

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• What email providers have extremely high reliability and robust SLAs?

  - by Benjamin Manns

  My dad is a professor who does part-time law practice. He had been using his university email address for professional correspondence, when he found out that the university had permanently lost 16 business-related emails in their spam filter (with no apology, notification, or compensation). What I am looking for now is an email provider (preferably with Exchange, but not required) with very high reliability and a SLA that is basically an insurance policy. I have looked at Google Apps's SLA, but this will not suit. I am looking for a provider who will take $X per month in registration fees, and will: Alert me when there is any downtime. Promptly fix the issue Pay me a fee ($Y) whenever there is downtime. I want a significant, contractual reason for them to be diligent in their service. Free service for me is not enough.

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• Oracle Hangs on Responses Intermittently

  - by Ryan Cook

  I want to preface this with the fact that I am a developer and I am not even close to a DBA, plus I am new to Oracle. OK, here it goes: I have a Java application which uses spring and hibernate. Its a simple CRUD app and I will leave the details out as I don't think they are the issue. I have noticed that my app runs fine when I use MySql, but when I use an Oracle 10.2 server every 7th-10th hangs for 5-10 seconds. My Oracle installation was done by me using all defaults, same as the mysql install. I don't even know where to start looking. Any ideas? Thanks in advance and sorry that I lack the details that are most likely required for help.

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• How to increase max FD limit for a daemon process running under a headless user?

  - by Ameliorator

  To increase the FD limit for a daemon process running under a headless user on a Ubuntu Linux machine we did following changes in /etc/security/limits.conf soft nofile 10000 hard nofile 10000 We also added session required pam_limits.so in /etc/pam.d/login. The changes got reflected for all the users who logged out and logged in again. Whatever new processes are starting under those users are getting new FD limits. But for the daemon which is running under a headless user the changes are not getting reflected. what is the way by which the changes can be reflected for the daemon which is running under headless user ?

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• WinXP Movie Maker Codec Error

  - by Bob Rivers

  I'm trying to use Windows XP Movie Maker, but when I try to import an AVI video, it shows an error telling me that it wasn't import due to an the fact that the codec wasn't available (I'm able to see the video using the windows media player) First, the error message suggested to enable the option "download codecs automatically" under "tools options general". I did it. But know the error tells me that the codec wasn't available and, if I already installed it, I should reinitialize movie maker. I also already did it... The error msg is: The file D:\movie1.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again. Any hints?

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• Java application crashes my computer. How do I troubleshoot?

  - by Oded

  I am using NetBeans 4.1 for my university course (this is an older version, but is the required version for the course - I can't use a newer version). Whenever I use it for longer than several minutes, my computer crashes - it either reboots or I need to reset it. I have tried running with all startup items disabled (to rule out other applications interfering with the app), but it did no good. I have used Sysinternals procmon logging and the logs are corrupt - the only way I was able to get a good log was by enabling boot logging. However these are huge and I don't know what to look for. I am using Windows XP SP3, fully patched up and this is the only application that I have any kind of problem with. Can anyone suggest troubleshooting steps that will help me pinpoint the cause of these crashes and fix them?

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• Will unbinding a server to an Open Directory Master remove its own file shares

  - by scape

  According to this article: http://support.apple.com/kb/TS3180?viewlocale=en_US I am required to remove the ldap binding of my second Mac OS X Lion server before I set it up as a replica server. I initially set the server up as a replica, or so I thought, and created file shares (it refers to the first server's ACL) before I realized it was never promoted as a replica server. So as of now it's running and shares files with correct ACL permissions but if the Master goes down all the file shares seize up. I want to set it up as a replica so this is not an issue; however, I don't want to lose the file shares and their permissions as I remove the binding and restart the server-- apparently I must remove the ldap binding to the OD Master (also a Mac OS X Lion server) before setting it up as a replica.

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• OS X Server - setting up a share for network home directories + fast user switching

  - by sohocoke

  I'm nearly finished setting up my Open Directory master to allow users to be managed centrally and logged in on any of the client machines at home. I found discussion suggesting that using an AFP share for the 'Users' automount would result in network users (cf. users defined locally, or Portable Home Directory users) are unable to use fast user switching, as the first user logging in would trigger the automount and mount the 'Users' share with his permissions, preventing further users from using the mount. I've also found some suggestions to configure autofs such that the 'Users' share is mounted prior to any user logging in, but not great amounts of details along these lines. I'd greatly appreciate some instructions to set up autofs - ideally, on the OpenDirectory server rather than each client's etc/fstab or equivalent location, so that it isn't required per every client machine - to get fast user switching working with network users.

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• sSMTP Configuration Question

  - by SevenCentral

  I've installed sSMTP on Ubuntu 10.04 via: sudo apt-get install ssmtp My configuration file is: # # Config file for sSMTP sendmail # # The person who gets all mail for userids < 1000 # Make this empty to disable rewriting. [email protected] # The place where the mail goes. The actual machine name is required no # MX records are consulted. Commonly mailhosts are named mail.domain.com mailhub=smtp.gmail.com:587 # Where will the mail seem to come from? #rewriteDomain= # The full hostname hostname=somedomain.com # Are users allowed to set their own From: address? # YES - Allow the user to specify their own From: address # NO - Use the system generated From: address #FromLineOverride=YES [email protected] authpass=**** usestarttls=yes Am I transmitting my credentials in clear text? Is calling ssmtp a secure operation? Thanks.

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