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• Get off greylisting (the reason why our emails bounced back)

  - by user34402

  Hello, I'm system administrator in online store. We send several emails to our clients after purchase: confirmation, invoice and sale notification to our staff. Recently we got most of emails bounced back and some bounces describes a reason as greylisting, others - just general failure. It is ruining our business because clients are calling that they didn't get the emails with confirmation and invoices. How to get off greylisting, and to not be greylisted? What actions should we do? Mailserver is dedicated machine using Mailenable on Win 2003. Thanks.

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• Make emacs aware of files externally moved/renamed on Mac os x

  - by Gyom

  I've been using mac os x for several years, and I realize that I've now gotten used to all applications transparently "following" files as I rename or move them (either via mv on the console or within the Finder's GUI), and emacs is pretty much the only program that does not. This is a shame though, because most of my time in front a screen is actually spent in front of emacs :-) Would anyone have any ideas or pointers about what measures I could take to get that behaviour in emacs ? (yes I know this is "impossible" to acheive in general, but when I just rename a simple file, or move it to a directory nearby, it's a shame I have to close/reopen it for emacs to notice. oh and no, I'm not going to use 'dired' as a file manager :-)

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• An international mobile app - Should I set up EC2 instances in multiple regions?

  - by ashiina

  I am currently trying to launch an mobile app for users around the world. It is not a spectacular launch which will get millions of users in weeks - just another individual developer releasing an app. I know enough about the techniques of managing timezones, internationalizing string, and what not ( the application layer ). But I cannot find any information on how I should manage my EC2 instances... Should I be setting up EC2 instances in different regions around the world? Is that a must-do, or is it an overkill? I'm aware that it's the ideal solution in terms of performance, but it becomes very tough managing servers in multiple regions. DB issues, AMI management, etc... I'd much rather NOT do so. So I would like to know the general best practice when launching an international app/website. Note: For static contents, I know it's better to use a CDN, so I'm planning on doing so.

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• What TLDs should I use for my NS records for redundancy? (DNSSEC support required)

  - by makerofthings7

  Question As a general practice, is it a good idea to use multiple TLDs for the name servers? How should I choose between which TLD would be a good candidate for being the root server for my NS name? More Info I am switching over 800 DNS zones to an outsourced DNS provider. I originally planned on setting the zone names to nsX.company.com, but think it would be best to have multiple TLDs such as .net , .org and .info Since I plan on supporting DNSSec at company.com I think all the 1st tier Name servers must support it as well. Part of the inspiration for this question came from our provider UltraDNS. In their configuration screen for our domains, they actively verify and alert us if our name servers aren't exactly: pdns1.ultradns.net pdns2.ultradns.net pdns3.ultradns.org pdns4.ultradns.org pdns5.ultradna.info pdns6.ultradns.co.uk

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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• How to delete previous revisions with svn?

  - by apache

  I want to clear all all previous revisions and leave only the current revision. Is there a way to do this? I don't find a possible command to do this: [secret@vps303 ~]# svnadmin --help general usage: svnadmin SUBCOMMAND REPOS_PATH [ARGS & OPTIONS ...] Type 'svnadmin help <subcommand>' for help on a specific subcommand. Type 'svnadmin --version' to see the program version and FS modules. Available subcommands: crashtest create deltify dump help (?, h) hotcopy list-dblogs list-unused-dblogs load lslocks lstxns pack recover rmlocks rmtxns setlog setrevprop setuuid upgrade verify

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• Does /boot safe on top of a lvm LV (logical volume)?

  - by fantoman

  Title already asked the question. More specifically, I read in some documents that logical volumes are nice in general but not for /boot in a linux system. They say that bootloaders don't understand LVM volumes, so create a separate partition for /boot out of lvm. I recently installed Ubuntu server (9.10) for my home server, but by default /boot is created in the LVM. Everything is fine now, but I am not sure it is safe to use /boot in LVM. Second question is do I really need a physical partition (volume)(pv) for /boot or is it equally fine if I put it into a logical volume (lv) on top of a single shared volume group. Thanks in advance.

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• Using git with cgit for decentralized/centralized development

  - by polemon

  I plan to use git for hosting my projects on my server. I've read about cgit, git-daemon, and I more or less decided to use those tools. But general use is still kind of confusing for me. What do I need to set up on the server, to push my files onto it. And when the files on the server are newer as the files on my computer, how do I merge them? Also, I use, say, two computers where I develop. How do I merge from one computer to the other? Also, when two people are working on the same project, how do they merge their local repos from one another? As you probably can tell by now, I come from SVN, but I've worked with Mercurial and now I'd like to test git.

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• Memcached clustered alternative

  - by Johan Kooijman

  I'm looking to replace memcached. We have a LOT of traffic to our central memcached node which I'd like to split. There's only so much trunking networks I can do. My general idea is to install a memcached-type daemon on every webserver and have the daemons replicate set/delete/updates over all the daemons, so that each webserver connects to a socket or on localhost. All data should be available on all nodes. The alternatives: - repcached (max 2 masters) - redis (single master) - couchdb/mongodb/handlersocket - persistent data on disk, I'd like to remove the disk part to gain more performance. Any hints?

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• Is it preferable to use POP or IMAP to check multiple google mail accounts from one?

  - by Adam Tuttle

  I have email accounts on several domains that use Google Mail, and thus far I've only ever used POP to send and receive mail from a single inbox. This is quite functional, and as long as I remember to select the appropriate FROM address when starting a new thread, mostly works without any additional thought: messages received on account A are replied to via account A, and so on. My only complaint is the lag -- I've seen sometimes as much as a half hour between messages arriving in an inbox before being imported into my primary inbox via POP. My question is this: Google also supports IMAP. Would that be in any way preferable over POP access? Reduced lag would be nice, but not at a general speed cost, if everything I do has to check another mailbox too.

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• Is it safe/wise to run Drupal alongside bespoke business web apps in production?

  - by Vaze

  I'm interested to know the general community feeling about the safety of running Drupal alongside bespoke, business critial ASP.NET MVC apps on a production server. Previously my employer's Drupal based 'visitor website' was hosted as a managed service with a 3rd party. While the LoB sites were hosted in-house. That 3rd party is no longer available so I'm considering my options: Bring Drupal in-house Find another 3rd party My concern is that I have little experience with Drupal administration (and no experience securing it) and that the addition of PHP to my IIS server poses a security risk. Is there a best practice that I can follow in this situation?

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• Why are the prices for broadband bandwidth at data centers much higher than consumer/small business offerings?

  - by odemarken

  The prices for broadband bandwidth at data centers are sometimes as much as 10x higher than for a typical small business/consumer connection, at least where I live. Now, I understand those are two differend kind of products, but what exactly are the differences? Is it mainly because the bandwidth you get at a data center is guaranteed (CIR), while a consumer offer lists maximal bandwidth (EIR/MIR)? Or are there other factors as well? (Note: my previous, much more specific question on the same general topic was closed as not constructive. I tried to extract the core issue and present it in a way that can be answered objectively. If you feel that this question is still bad and should be closed, please care to comment and explain why.)

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• Adding Command-Line Switches To Windows Shortcuts

  - by jaytea

  Is there a way to, in general, create a Windows shortcut to a file and instruct Windows to pass certain switches to the application before passing the filename? For example: I have an Excel file, abc.xlsx. If I want to create a shortcut to open this file read-only, I would change the target to "C:\Program Files\Microsoft Office\Office12\EXCEL.EXE" /r abc.xlsx, but this fails when another person on my network opens the shortcut and their EXCEL.EXE is not in that same folder. Surely there's a way to tell Windows to pass the /r switch without supplying the path/filename of the application that is supposed to open the file?

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• getting started automating virtualization with powershell on windows

  - by fschwiet

  What are some good books or resources for learning automate virtual PCs on Windows DataCenter? I want to be able to build VPCs with both automated installs and from images, preferably via powershell. I would like to be able to setup an IIS environment for automated testing, and configure end user installs of different versions of Windows. I am not interested in corpnet type scenarios (active directory, domains, etc) so much for now. I'm comfortable with powershell and programming in general. I haven't yet installed Windows DataCenter, maybe once I install it will be clear enough. But looking for resources on how to managed virtual PCs programmatically I haven't found anything.

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• How to force "Windows Explorer" to open new folders in the same window

  - by yoshiserry

  I have been searching for an answer to this question for a very long time. I have checked the "open folders in the same window" radio button in the general tab of folder options. I have also been told to uncheck the launch as seperate processes button in the view tab of folder options. I'm thinking some how this must be a registry issue. Anyone know a registry hack that will fix this problem and force windows explorer to open folders in the same window. I'm sick to death of having so many windows open. Im running Windows 7 Ultimate Beta 7100.

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• Does a modern PC require a graphics card to run?

  - by ArtM

  As I can remember, on old systems (Pentium II or III) it was not possible to boot and run the PC if the graphics card was missing (AGP cards were used in those days). Many years from then, I'm using motherboards with integrated graphics and I have no experience related to this subject, the "graphics card" always was present. Currently I intend to build a home/private "server" for my purposes and most of the motherboards I want to buy have no integrated graphics (AMD 870 or 970). I can take a normal graphics card from my firends for a few hours/days and use it when installing the necessary software. The question is: can I boot and run the PC without problems after I install everything I need and the graphics card is removed? if a general answer cannot be given, at least some examples of manufacturers/MB series/MB models will be helpfull I think it's obvious, but for completeness: I mean cheap desktop components, not real servers.

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• How can I fully automate the creation and configuration of a SharePoint virtual machine?

  - by vnat

  I typically require multiple SharePoint virtual machines for development purposes. I currently manually build these every time I need one, either starting from a fresh OS install or using sysprep when working with SharePoint 2010 and SQL Server 2008 R2. I currently use VMWare, but am open to VirtualBox or Hyper-V. I'd like to be able to go from zero to a working VM with SharePoint, SQL and Visual Studio all through script. Is this a feasible task? Or are there more practical methods which would start from a VM with a fresh installation of an OS, and then use more standard unattended installs. Although general, I'd like to know which direction to focus my efforts. Thanks in advance, vnat

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• Asus V1S screen dimming randomly

  - by Bill

  I have an Asus V1V, which is the same as the Asus V1S except for the video card. I have a problem where the screen will randomly lose brightness or flicker between being lit and not lit. The picture below is of the left hinge, with the cover removed. Pressing one of these cables affects this behaviour, and pressing it in place will resolve the issue for a few hours. My guess means the inverter cable is damaged, based on previous experience. As the picture shows, there are two cables, an LCD cable and what I assume is an inverter cable. I purchased an LCD cable for my model of laptop, but have been unable to find an inverter cable. It seems not to exist. I would like some input on if an inverter cable actually exists, if it is likely the problem, or solutions in general to resolve this problem permanently.

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• Compression for custom mime type works on IIS 7.5, but not IIS 7.0?

  - by Doogal

  I've managed to set up compression for a custom mime type on IIS 7.5 with no problem. Add the mime type to IIS then add it to the httpCompression element in applicationHost.config. But when I do the same thing on IIS 7, the particular mime type is never compressed. This isn't a problem with compression in general since other mime types are compressed correctly. As far as I can tell, IIS 7 and IIS7.5 are configured in exactly the same way. Does IIS7 behave differently and do I need to do something else to get it working? I've setup failed request tracing and get a NO_MATCHING_CONTENT_TYPE error during compression but I can't figure out what else I need to do to tell IIS about my mime type

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• Can I rent exclusive time on a powerful server running linux? [closed]

  - by Mark Borgerding

  My company is involved in a proposal that requires speed estimates of our software on a server with the latest & greatest processors. This is not the first time we've been in this situation. The servers themselves are too expensive to buy a new one every time, so we end up extrapolating from what we have. There are so many variables: processor generation & speed, memory speed, memory channels, cache configurations; it makes extrapolation difficult and error-prone. Is there a business that rents time on the newest servers? At least part of the time we'd need exclusive access to an otherwise quiescent system either via ssh shell access or unattended batch jobs. I am not looking for general cloud computing services. I don't need much time on the server, but it needs to be exclusive. And the server needs to be pretty cutting edge for a solid basis of estimate.

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• NFSv4 with idmap

  - by HTF

  The following errors appear on the NFS server, could you please advise how I can fix this? Details: System: CentOS release 6.4, NFS: nfs-utils-1.2.3-36 # cat /etc/idmapd.conf [General] Domain = domain.com [Mapping] Nobody-User = nobody Nobody-Group = nobody [Translation] Method = nsswitch Sep 3 08:25:28 snode1 rpc.idmapd[1382]: nss_getpwnam: name '0' does not map into domain 'domain.com' Sep 3 08:25:29 snode1 rpc.idmapd[1382]: nss_getpwnam: name '500' does not map into domain 'domain.com' EDIT: 03 Sep 2013 10:41 Please note that I'm using NFSv4 and these errors appear on NFS server only (not NFS clients). Server: # cat /etc/sysconfig/nfs MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" ... RPCNFSDARGS="-N 2 -N 3" Clients: # cat /etc/fstab server:/ /data nfs4 defaults,hard,intr,timeo=15,_netdev,noatime,nodiratime,nosuid 0 0

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• Finding a way to enter gmail in Company

  - by stckvrflw1

  Hello all, I am entering network over DNS's of my company. Here my company blocks lots of IP's for reasons like entertainment, sports, music, messaging boards etc. General e-mail is also one of those topics and I can't enter gmail.com. The proxy sites are also blocked in the company and the one's I have found (by spending much afford) are not accepting cookies. Also I am not able to enter the gmail from Igoogle too, this is also blocked. How can I enter gmail ? Thanks.

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• What are semaphores and how are they caused?

  - by tharkun

  I recently started having the problem that my Apache crashed and could not be restarted. The hosting company then told me that it has to do with 'semaphores' and sent me this snipped with which they solved the problem: /usr/bin/ipcrm sem $(/usr/bin/ipcs -s | grep www-data | awk '{print$2}') Now that's nice to have a command to execute that solves my problem but then again I have no clue what this is all about. What are semaphores and who the heck puts them, where they are and how do they crash my apache? I'd be really glad for some general explanations!

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• Certain websites do not open. Instead a 1*1 image gets displayed

  - by Ranjith - SR2GF

  When I try to visit certain websites like www.bidvertiser.com, www.buysellads.com, a white page shows up, the title bar displays the site name followed by (1x1) in brackets. When I right click, 'View Source' option appears disabled. The Save As.. option shows the file type to be gif. However, when I preview the site in Google search results ( by moving the mouse over ) the screenshot of the site displays well. This happens on all the three browsers on my computer: Chrome, Firefox and IE. What is the problem and how can it be resolved? EDIT: At some point of time, they probably worked on my computer! I think it is a more general problem. The same happens when I click on certain links in Google search results.

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• What is Slotted and pure aloha?

  - by caspert

  So I am having a really hard time understanding slotted and pure aloha. I have understood CSMA/CD fairly well, but that is it. I have the book: Computer networking - a top down approach, but I find the explanation very cryptic and hard to understand. Wikipedia did not help me. Does anyone have a brief "aloha for dummies" explanation? or perhaps a video tutorial? I think I need something visual. I don't need to be able to create the protocol, I just need a general understanding of it.

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