Search Results

Search found 9254 results on 371 pages for 'approach'.

Page 259/371 | < Previous Page | 255 256 257 258 259 260 261 262 263 264 265 266  | Next Page >

• Where can I find comprehensive documentation on the various aspects of Linux?

  - by Fsando

  Whenever a problem pops up in my use of Linux (full time user for 6 years) I start by googling. The simplest (or most common) issues will usually be cleared right away. If it's not in one of those two categories the advise I find tend to be wrong, misguided, obsolete, and if you ask a question here on "ask" you risk being "duplicated" to some superficially similar question. Some issues have haunted me for years until I suddenly hit on the actual developer's documentation (or equivalent) which in a few lines explains how to solve my issue, the correct and consistent way. Whenever that happens I'm always kicking myself: why didn't I just go here to begin with? And the obvious answer is: "I had no idea this was what I was looking for". And for the issues that this hasn't yet happened I'm banging my head: "This ought to be either straight forward or someone tell me it's not doable" So my question is: Are there projects out there trying to collect or list this documentation in a searchable/browseable way. I know there are many very good "if you want this do that" tutorials on Ubuntu but I'm looking for actual documentation. That either are or could be collected in one place (at least conceptually) so that search for information could start in one place. I'm fully aware this is a broad question but if you approach it as: Does gnome have a comprehensive documentation project - where do I find it? Does Ubuntu have a comprehensive documentation project - where do i find it? For example: how exactly does the mime-type association work in Ubuntu and in xubuntu? How exactly are menus created (in Ubuntu: quicklists, xubuntu/gnome: the main menu) How exactly does the rendering process work for compiz/x? (I'm having this issue where windows randomly stops updating until somehow forced to resume (I guess). So for instance where do I look for logs that may indicate the problem. How may I change randr or other settings that may influence this issue. So my point is to organize exact documentation or preferably to find projects that do this already. Thanks! If answers to this question get me started I'm hoping to collect such a list.

  Read the article

• Windows web server and SQL Server on same dedicated server

  - by asinc

  I'm currently trying to decide on the best approach to handle hosting a few moderate traffic websites for production e-commerce and online applications. We'd like to move to a dedicated server and are looking at this as the most likely machine: Quad Core Intel Core2Quad Q9550 Processor, 2.83 Ghz X 4, 4 GB Kingston Ram This would run Windows Web Server 2008 R2 x64 and potentially also Sql Server Web 2008 and SmarterMail server. Given that we already pay for a high-end VPS for development, testing, shared version control we'd like to avoid going with two servers for production. We'd like to avoid using shared sql server hosting and have thought of using the development server as the database server as an option too - but potentially a security risk due to use for development by internal and contract users. The questions are: - Do you feel there would be performance degradation by running this on the same machine? - Are there significant issues to be concerned about if we do this? We understand that best practice would be to run separate db and app servers but the volume of traffic is currently not that high and adding another server just for database is currently too costly. - What are others doing out there? Alternatively, would you recommend instead going with two separate VPS servers with 2GB RAM each on Hyper-v which would be about the same cost as the single dedicated server above? Thanks!

  Read the article

• How do you install/configure JBoss on Linux/Unix?

  - by mafro

  I'm currently working on how install and configure multiple (30+) JBoss EAP 5 configurations (both standalone and clusters) for development, test and production at a client's site (running SuSE). I'm not to fancy about the jboss way of storing application/configuration together with system files, so I have tried to split things up (ie moving server config out of the jboss installation directory). I also would like minimize the amount of configuration needed when upgrading/patching jboss - but I'm not done thinking about that... It would be great to hear how you've done and what you think about my approach. This is how my installations look like (for the moment): Standard JBoss EAP install (minus server configs): /opt/jboss/jboss-eap-5.0/jboss-as /opt/jboss/jboss-eap-5.0/jboss-as/bin/ /opt/jboss/jboss-eap-5.0/jboss-as/lib/ /opt/jboss/jboss-eap-5.0/jboss-as/server/ [server configs removed to avoid starting them by mistake] /opt/jboss/jboss-eap-5.0/jboss-as/.../ Application (some jboss folders has been omitted - you'll get the point anyway): /app/<project>/ [$app.dir - application specific base folder] /app/<project>/jboss/ [$jboss.home] /app/<project>/jboss/bin/ -> /opt/jboss/jboss-eap-5.0/jboss-as/bin /app/<project>/jboss/lib/ -> /opt/jboss/jboss-eap-5.0/jboss-as/lib /app/<project>/jboss/server/<cfg>/ [project specific config based on 'production'] /app/<project>/jboss/server/<cfg>/log/ -> /log/<project>/<cfg> /app/<project>/jboss/server/<cfg>/... /app/<project>/jboss/.../ -> /opt/jboss/jboss-eap-5.0/jboss-as/.../ /app/<project>/bin/ [application specific scripts for start/stop etc - wraps jboss supplied scripts] /app/<project>/deploy/ [application deploy folder] /app/<project>/etc/ [application specific config] Questions: How do you install JBoss (on linux/unix systems)? Where do you put JBoss and what modifications do you do? Where do you put your applications and application specific files? Do you share JBoss instances between applications or run one instance/cluster per application? How do you manage configuration changes (i.e. your modifications of jboss standard config)?

  Read the article

• Multiple Users use Script to Access Remote Server via Passwordless SSH

  - by jinanwow

  I am currently setting up a linux box that is tied into Active Directory. This box will allow users to SSH into it with their AD username and password to gather information (Box A). The issue is I am trying to create a function in /etc/bash.bashrc so the users has to do is type "get_info" for example, the function will SSH into a remote machine (Box B) run a command and output the information back to the user. The issue with this is, I have generated a rsa key on Box A, added it to the Box B authorized_keys and it works fine. The issue I am running into is, how do I set this up one time for the current users and any new user who logs into Box A. Is there a better approach than what I am currently doing. Essentially I just need to connect to the remote box, run a command, output the information back to the user and that is it. How can I allow new users to connect via a script to the remote box without having to generate RSA keys for them. The get_info fuction will be supplied a value 'get_info 012345' and returns the results.

  Read the article

• Stop Outgoing Spam Already Tagged as Spam

  - by me

  Hi, I run a Postfix server with Amavis and Spamassassin among other things. Postfix receives mail from the outside world and passes it on to Amavis. Amavis has Spamassassin rate the mail, and then tags it as spam if necessary. Then Postfix relies on each users' procmailrcs to deal with the mail as they will. I believe this is the correct approach because I believe each user should have the ability to choose what to do with their spam. Unfortunately, we also have some users with foregin domains in our virtual alises list. Because these addresses don't have user accounts with our servers, the spam that is forwarded to them is never put through a procmailrc and we end up forwarding spam, already tagged as spam, to other servers. Is there a way to stop outgoing mail already tagged as spam? Or is there any other way to fix this? EDIT: I only wish to delete the messages that are both spam AND being forwarded to other servers. I don't want to delete all mails marked as spam. Is there a way to distinguish between the two?

  Read the article

• How can I capture output from LFTP? (Output not written to STDOUT or STDERR?)

  - by jondahl

  I would like get access to progress information from lftp. Currently, I'm using curl like so: curl http://example.com/file -o file -L 2> download.log This writes curl's progress information to the download.log file, which I can tail to get real-time progress. But the same approach doesn't work with lftp, either with stdout or stderr. I end up with an empty download.log file, until the transfer is complete. lftp -e 'get http://example.com/file;quit' 2> download.log lftp -e 'get http://example.com/file;quit' 1> download.log When I don't redirect output, I see progress on the screen. When I do redirect output, I stop seeing progress on the screen, but nothing shows up in download.log. After the file transfer is complete, I see the final result, like this - but nothing before: 97618627 bytes transferred in 104 seconds (913.1K/s) Is lftp doing something unusual with its output - printing to screen without printing to stdout/stderr? Are there other ways of capturing screen output than redirecting stdout/stderr?

  Read the article

• How does a web server/the http protocol handle version control and compression?

  - by Sune Rasmussen

  When a client browser requests a file from the web server, I know that some kind of check is performed, because the files needed to serve the web page may already be cached by the web browser. So, if a file exists in the cache, no files are sent. But if the file on the server has changed since the file was cached in the browser, the file is sent and updated anyhow. Then, if you have compression like gzipping enabled on the server, the files that are to be provided to the client must be gzipped on the way, requiring some amount of server side processing. But how is this managed? The logical approach seems to me, that the web server should have a cache as well, containing the newest version of all files that have been requested within a certain time span, thus a compressed version of these files, so that compression would not have to be done each time a files is requested. And also, how are files eventually requested? Does the browser ask for files, each time it encounters one in the HTML code and the specific file is not stored in the local cache, or does it sum all the files that are needed up and ask for the whole bunch at the same time? But that's only guessing from a programming point of view, and I don't really know. If the answers are very different among web server systems, I'm primarily interested in Apache, but other answers are appreciated, too.

  Read the article

• No internet connection using Edimax routers

  - by idan315

  I have two computers connected to a router, connected to my ADSL modem by PPPoE. One of those computrs use Windows XP, the other uses Windows 7. The computer using Windows 7 keeps getting limited or no connectivity, and I can't use it to connect to the internet. Connecting the computer to the modem without the router 'in the way' worked, and I was able to use the internet - which led me to believe that the problem is with my router. However, I have changed my router, and the problem persists. I am really lost on how to approach this problem. Possible leads: when I view the network information, I see that my computer is connected to 'Multiple Networks'. One of those is "Network 4" (probably my router), and the other is Unidentified network. I don't know how to make the "Unidentified Network" disappear, or why is it even there in the first place. When I try using "ipconfig", I have two default gateway IPs. The first is 0.0.0.0, and the second is the IP of my router (192.168.2.1). The first router was Edimax BR-6204Wg. The second one I've tried connecting is BR-6424n. Any ideas?

  Read the article

• IMAP proxy as a POP3 hub?

  - by mailman stan

  Simple scenario, complicated technology: One family receiving mail from five email addresses via POP3 into one Outlook inbox on a single PC. Now we'd like to be able to replicate that single inbox across multiple devices (eg. desktop PC, laptop, netbook, smartphone). If we continue using POP3 as the mail transfer protocol, messages will be downloaded to one device and will not be visible to the others; replies will likewise be isolated on the sending machine. If we switch to IMAP, I understand that we can have multiple devices maintaining a shared view of an inbox hosted at the server end, but what about multiple accounts? I tried changing the account configuration in Outlook to fetch from the mail providers' IMAP service instead of POP3, which does give a shared view across multiple devices but also causes Outlook to create a separate inbox and PST for each account. This is awkward because it means there are five separate folders that need to be checked, and Outlook tools like search filters and rules don't seem to work across accounts. To get what I want (five accounts delivered into one shared mailbox) it seems that I would need some sort of intervening server that collects mail (using POP3) from all our accounts into a single inbox while preserving the original destination addresses, and then serves it up to all our devices using IMAP. Is this workable? Is it a good approach? Is there an easier way?

  Read the article

• How should I fix problems with file permissions while restoring from Time Machine?

  - by Andrew Grimm

  While restoring files from a Time Machine backup, I got the error message "The operation can’t be completed because you don’t have permission to access some of the items." because of problems with files in one folder. What's the safest way to deal with this? The folder in question has permissions like: Andrew-Grimms-MacBook-Pro:kmer agrimm$ pwd /Volumes/Time Machine Backups/Backups.backupdb/Andrew Grimm’s MacBook Pro/2010-12-09-224309/Macintosh HD/Users/agrimm/ruby/kmer Andrew-Grimms-MacBook-Pro:kmer agrimm$ ls -ltra total 6156896 drwxrwxrwx@ 19 agrimm staff 680 18 Jan 2008 Saccharomyces_cerevisiae -r--------@ 1 agrimm staff 60221852 4 Aug 2009 hs_ref_GRCh37_chrY.fa -r--------@ 1 agrimm staff 157488804 4 Aug 2009 hs_ref_GRCh37_chrX.fa (snip a few files) -r--------@ 1 agrimm staff 676063 27 Oct 2009 NC_001143.fna -rw-r--r--@ 1 agrimm staff 6148 23 Mar 2010 .DS_Store drwxr-xr-x@ 3 agrimm staff 1530 23 Mar 2010 . drwxr-xr-x@ 30 agrimm staff 1054 20 Nov 14:43 .. Is it ok to do sudo chmod, or is there a safer approach? Background: Files within the original folder on my computer also had weird permissions - I suspect I may have used sudo to copy some files from a thumbdrive onto my computer.

  Read the article

• Have powershell zip the contents of a bunch of folders, individual zip for each folder

  - by WebDevHobo

  Recently, I asked how to do this with a .bat file and an answer was provided. for /D %%d in (*.*) do "C:\Program Files\7-Zip\7z\7za.exe" a -tzip %%d.zip %%d However, this proved useful only for folders that have no spaces in their name. The reason being that batch will do the following: if the folder name is "jef's vacation pics", the variables will be: %%d = jef's %%e = vacation %%f = pics And then it tries to pass only %%d to the 7-zip program, which will not find such a folder and therefor will not create a zip file. I've tried looking up some tutorials, documentation sites and such, but I haven't been able to come up with an answer. There may be an answer, but I want to take this opportunity to try my hand at powershell. I was thinking that a function with 1 argument, that being the parent-folder of the sub-folders that need to be zipped, would be the best approach. So here's what I have, which doesn't work, probably due to my general in-experience with powershell: function zipFolders($parent) { $zip = "C:\Program Files\7-Zip\7z\7za.exe"; $parents | ForEach-Object $zip a -tzip }

  Read the article

• DNAT to 127.0.0.1 with iptables / Destination access control for transparent SOCKS proxy

  - by cdauth

  I have a server running on my local network that acts as a router for the computers in my network. I want to achieve now that outgoing TCP requests to certain IP addresses are tunnelled through an SSH connection, without giving the people from my network the possibility to use that SSH tunnel to connect to arbitrary hosts. The approach I had in mind until now was to have an instance of redsocks listening on localhost and to redirect all outgoing requests to the IP addresses I want to divert to that redsocks instance. I added the following iptables rule: iptables -t nat -A PREROUTING -p tcp -d 1.2.3.4 -j DNAT --to-destination 127.0.0.1:12345 Apparently, the Linux kernel considers packets coming from a non-127.0.0.0/8 address to an 127.0.0.0/8 address as “Martian packets” and drops them. What worked, though, was to have redsocks listen on eth0 instead of lo and then have iptables DNAT the packets to the eth0 address instead (or using a REDIRECT rule). The problem about this is that then every computer on my network can use the redsocks instance to connect to every host on the internet, but I want to limit its usage to a certain set of IP addresses only. Is there any way to make iptables DNAT packets to 127.0.0.1? Otherwise, does anyone have an idea how I could achieve my goal without opening up the tunnel to everyone? Update: I have also tried to change the source of the packets, without any success: iptables -t nat -A POSTROUTING -p tcp -s 192.168.1.0/24 -d 1.2.3.4 -j SNAT --to-source 127.0.0.1 iptables -t nat -A POSTROUTING -p tcp -s 192.168.1.0/24 -d 127.0.0.1 -j SNAT --to-source 127.0.0.1

  Read the article

• How to register an agent with launchd

  - by Konrad Rudolph

  I’m unable to schedule a periodic launch with launchctl/launchd on OS X (Leopard). Basically, I’m unable to find a step-by-step list of instructions on the web and the intuitive approach doesn’t work. The sync.plist file: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>net.madrat.utils.sync</string> <key>Program</key> <string>rsync</string> <key>ProgramArguments</key> <array> <string>-ar</string> <string>/path/to/folder/</string> <string>/path/to/backup/</string> </array> <key>StartInterval</key> <integer>7200</integer> </dict> </plist> I’ve put this script inside the path ~/Library/LaunchAgents. Next, I’ve registered the script using launchctl load ~/Library/LaunchAgents/sync.plist Finally, to test that it works, I started the job: launchctl start net.madrat.utils.sync – Nothing happened. Manually executing the rsync command in the terminal yields the expected result. I’m fairly sure that the job was registered correctly because if I try to start a non-existing job, I get an error message (which I didn’t get in the above command). What did I do wrong?

  Read the article

• How to push changes from Test server to Live server?

  - by anonymous

  As a beginner, I finally noticed the issue with making changes to the live server I've been working on, now that I have a couple users on it, since I bring it down so often. I created an EC2 image of my live server and set up a separate instance on EC2, so now I have 2 EC2 instances, Stage and Production. I set up GitHub and push changes to stage and test my code there, and when it's all done and working, I push it to the production branch, and everything is good. And there is a slight issue here since I name my files config_stage.js and config_production.js and set up .gitignore on each server, and in my code, I would have it read the ENV flags and set up the appropriate configs, is this the correct approach? And my main question is: how do you keep track of non-code changes to the server? For example, I installed HAProxy, Stunnel, Redis, MongoDB and several other things onto the Stage server for testing and now that it's all working and good, how do I deploy them to production? Right now, I'm just keeping track of everything I installed and copying configuration files over, which is very tedious and I'm afraid I may have missed a step somewhere. Is there a better way to port these changes over from my test server to my live server?

  Read the article

• Iverter, inverter cable, or a display cable?

  - by krebshack

  I was recently hired at a small repair shop. I work indoors while my boss does on site calls for small businesses. I have to troubleshoot and fix laptop screens a few times a week and this is why I'm posting this question. I'm having trouble figuring out how to stream line the troubleshooting process. For example, how do I determine whether the inverter is broken while also determining that the inverter cable is not. How can I quickly decide that the inverter cable is broken while knowing that the inverter is most likely not broke. Or how do I know that it's just the display cable? It seems like this is a good way to approach things: "It could be the inverter, backlight, or the LCD panel itself. Backlight failure is usually hinted at by a pink hue to everything. Inverter failure usually results in the dimming of images on the screen to the point where the backlight is not even on (the inverter provides power to the backlight)" Source. While remembering that things "like flickering, screen freeze in dark image and [a] corner starts to get brighter" point to a "failure in the LCD panel itself, though it could just as easily be a loose data cable connected to the back of the LCD." Source. In short, I'm soliciting advice that anyone might have on how to quickly make the best decision about what's causing problems with laptops display. Thank you.

  Read the article

• Trojan Horse Generic.15.apnz Virus Impossible to get rid of?!

  - by DaveDev

  Hi Guys I'm new to this forum so I'm unsure whether this is the right place for a question like this. I have a Trojan Horse infection that lives in memory and seems to be impossible to get rid of. I've tried a vew AntiVirus products (Norton, Windows Essentials & AVG Free) all to no avail & I've recently tried a few bootable antivirus solutions I found here: http://www.techmixer.com/free-bootable-antivirus-rescue-cds-download-list/ Kaspersky Rescue Disk 2008 (failed - it wouldn't even load the UI, is there a newer one out there?) F Secure Rescue Disk (Updates & Scanner ran, found 10 infections, said it was going to delete or repair them, but didn't get rid of them) Avira found a load of infections but it froze when I tried to interact with the UI after the scan. Every time I run these I'll load Windows after & run AVG, and it still finds Trojan Horse Generic.15.apnz (in Services.exe) & Trojan Horse Generic.16.ARSU (in svchost.exe) Is anyone familiar with a virus like this? Can anyone suggest how to approach a solution? Thanks Dave

  Read the article

• Configuration for a two machine ESXi cluster using VSA to present local storage to VMs

  - by MDMarra

  I'm designing a little vSphere 5 cluster for one of our remote sites. We have some IBM x3650s that have 6x 300GB 10K RPM drives in them, along with dual quad core CPUs and 24GB RAM. Because we use HP P4500 G2s at our primary site, we have licenses available for HP P4000 VSAs. I thought that this would be the perfect opportunity to use them. Below is a basic drawing of what I want to accomplish: I want to run a P4000 VSA on each server and run them in a Network RAID-10 (Lefthand speak for network mirroring, think of it as RAID 1 across nodes or as an active/active storage cluster). I will then present this storage to guests that will run on this mini-cluster. It will be managed by a vCenter Server on our main site. All connections will be GbE with two dedicated to storage. Management and Data will share a pair of connections, since I don't expect there to be high load. These servers are just there to provide directory services, dhcp, printing, etc. Does anyone see anything potentially wrong with this approach? Is this the best way to do this without adding additional dedicated storage heads? Are there any pitfalls in this design, besides the lack of dedicated Data/Mgmt interfaces?

  Read the article

• Vserver: secure mails from a hacked webservice

  - by lukas

  I plan to rent and setup a vServer with Debian xor CentOS. I know from my host, that the vServers are virtualized with linux-vserver. Assume there is a lighthttpd and some mail transfer agent running and we have to assure that if the lighthttpd will be hacked, the stored e-mails are not readable easily. For me, this sounds impossible but may I missed something or at least you guys can validate the impossibility... :) I think basically there are three obvious approaches. The first is to encrypt all the data. Nevertheless, the server would have to store the key somewhere so an attacker (w|c)ould figure that out. Secondly one could isolate the critical services like lighthttpd. Since I am not allowed to do 'mknod' or remount /dev in a linux-vserver, it is not possible to setup a nested vServer with lxc or similar techniques. The last approach would be to do a chroot but I am not sure if it would provide enough security. Further I have not tried yet, if I am able to do a chroot in a linux-vserver...? Thanks in advance!

  Read the article

• Chroot jail of Nginx and php

  - by sqren

  I'm hosting multiple websites on one VPS, and want to chroot each website, eg. /chroot/website1 /chroot/website2 I'm using makejail, which is a highlevel tool, for creating the jails, and copying the libraries and dependencies. Easy peasy. Each website will need nginx, php and mysql. For php I'm using php5-fpm which actually supports chroot by configuration, however I'm not using this (maybe I should?) My question is which approach of the following three is the better: 1) Every website will have its own seperated instance of nginx, php and mysql. The downside is, that each webserver + php has to listen to a different port. I also need a "master" nginx web server in front of them, reverse proxying to the chrooted servers behind it. Probably most secure, but also most advanced. 2) I don't make any chroot jails manually. I setup one nginx web server, that proxies php requests to php-fpm, on different ports. I can have multiple php-fpm configurations each with is own chroot'ed folder. This is quite managable - however only php will be chrooted. Not the actual webserver. Is this secure enough. Also, I tried this option out, and it seems I will need to use TCP instead of sockets for connecting to MySQL. 3) You tell me ;) I'm quite new to chroot jailing, so please correct me if I'm wrong in my assumptions. I've been reading all the tutorials I could find, however, I find the market for chroot guides very scarce. Any help or inputs much appreciated!

  Read the article

• Map a domain to another subdomain - Rackspace

  - by Gorgi Rankovski

  I am using a subdomain as a parameter to an ASP.NET MVC 4 application. It's working well. Now I need to test my approach, so I have the application hosted on appharbor. It works well with subdomains here too. Our DNS registers are on Rackspace, but I have no control over it. Another guy is responsible for that. So, myapp.apphb.com can be accessed through myapp.com. Also abc.myapp.com is working as expected. I use abc as a parameter. So, now I want abc.com to be mapped in those Rackspace DNS registers to abc.myapp.com Is this possible at all? Can you explain to us how to do that? Will I have some problems with it? Anything that I should be aware of? Please have in mind that I am newbie when it comes to DNS. And no experience with Rackspace. Thanks.

  Read the article

• Backing up VMs to a tape drive

  - by Aljoscha Vollmerhaus

  I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can store and retrieve files like a charm using tar, both tar cf /dev/st0 somedirectory and tar xf /dev/st0 work flawless. However, what I really would like to backup are LVM LVs. They contain entire virtual machines with varying partition layouts, so using mount and tar is not an option. I've tried using something like dd if=/dev/VG/LV bs=64k of=/dev/st0 to achieve this, but there seem to be various problems associated with this approach. Firstly, I would like to be able to store more than 1 LV on a single tape. Now I guess I could seek to concatenate the data on the tape, but I think this would not work very well in an automated scenario with many different LVs of various sizes. Secondly, I would like to store a small XML file along with the raw data that contains some information about the VM contained in the LV. I could dump everything to a directory and tar it up - not very desirable, I would have to set aside huge amounts of scratch space. Is there an easier way to achieve this? Thirdly, from googling around it seems like it would be wise to use something like mbuffer when writing to the tape, to prevent what wikipedia calls "shoe-shining" the tape. However, I can't get anything useful done with mbuffer. The mbuffer man page suggests this for writing to a tape device: mbuffer -t -m 10M -p 80 -f -o $TAPE So I've tried this: dd if=/dev/VG/LV | mbuffer -t -m 10M -p 80 -f -d 64k -o /dev/st0 Note the added "-d 64k" to account for the 64k block size of the tape. However, reading data back from a tape written in this way never seems to yield any useful results - dd has been running for ages now, and managed to transfer only 361M of data from the tape. What's wrong here?

  Read the article

• How to configure amavisd-new for only scanning on particular senders/servers?

  - by mailq

  I'd like to know how to configure amavisd-new to only scan for Spam on particular clients (IPs, CIDRs or hostnames) or alternatively sender's email domain. I know that it is possible to do it on a recipient's mail address but not on how to do it for the sender's mail address. It is even possible to do it on a recipient's IP address with policy banks. But my approach should be to be independent of recipient and only relay on the sender. What I want to accomplish is to only scan mails originating from Yahoo, Google, Hotmail and the other big senders. So it is easier to configure which senders should be observed than the ones that shouldn't. I known that it is easier to achieve on the MTA side, but that is not part of the question because I already go a solution on the MTA side. I want to do it on amavisd-new. And it doesn't help to know how to put senders on a whitelist, as this still means that the mail goes through all the scanning but then gets a high negative score. The mail shouldn't be scanned at all unless sent by the big players. So which parameters in amavisd-new is the right one to enable scanning for particular senders and only for these?

  Read the article

• Permission denied when running Rails app in VirtualBox Ubuntu guest with files on Windows host

  - by Ola Tuvesson

  I think I'm close to having my dev environment set up exactly the way I want, but one final snag remains. I'm running VirtualBox on a Windows 7 64bit host, with my dev enviroment inside a Ubuntu 12.04 guest. I want to keep the files for my projects on the host filesystem - partly so I can access them when the Ubuntu guest is not running, but also so I can use Tortoise and other Windows based tools (cough Photoshop), and it also eases my backup scheme somewhat. So I've got a folder "Rails" on my NTFS drive, which I've shared (Samba) from the host with a user specifically created for the Ubuntu guest. The mount point has been set up and an entry added to fstab (cifs), using a credentials file and the options iocharset=utf8,mode=0777,dir_mode=07??77 This mounts fine and my Ubuntu user has both read and write permissions to the contents. But when I try to start my Rails app I get permission errors on any files the app needs to write to (e.g. the log file) - why is that? Are there any major conceptual flaws with this approach? Would I be better off using the VBox "shared folders" function?

  Read the article

• Black screen appears when booting new install of Ubuntu 11.10 on my desktop, cannot access Grub menu to fix

  - by izn

  I installed 11.10 on my desktop PC but get a black screen after the BIOS screen when I try to boot it. I was able to run 10.04.04 on my hard drive before installing 11.10 and I am also able to use 11.10 on my usb pendrive and CD ROM. I've tried unplugging all USB devices before booting and also upgrading from 11.10 to 11.10. Holding the shift key from the BIOS screen doesn't allow me to access the GRUB menu to try: Highlight the first entry, press “e” to edit it. Navigate to words “quiet splash”, delete them and type “nomodeset” in their place (without quotes). Press Ctrl + X to continue boot. Once on the desktop, go to System Administration Additional Drivers and activate the recommended drivers. So running 11.10 on my pendrive, I tried editing /etc/default/grub, commenting out the GRUB_HIDDEN_TIMEOUT setting by putting a '#' in front of it to display the grub menu and setting GRUB_TIMEOUT setting to a value greater than or equal to 1 e.g. GRUB_TIMEOUT=10. However, when I run sudo update-grub, I get: /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?) I get the same error with update-grub after: sudo mount /dev/sda1 /mnt and after: sudo grub-install --root-directory=/mnt /dev/sda reboot sudo update-grub Other suggestions to fix the update-grub problem: Open synaptic, then purge all the related grub installed packages and reinstall grub-pc then and finally: sudo update-grub Or use Grub Customizer http://ubuntuforums.org/showthread.php?t=1195275 What would be the best way to approach this? I'm concerned about purging "all the related grub installed packages" but if it's true some files are corrupted this would seem necessary. Also, was I executing the correct commands i.e. with mount and grub-install, before running grub-update?

  Read the article

• How does enterprise failover, such as with google.com, actually work?

  - by Alex Regan

  We have a few fedora systems that are configured for web, FTP, and email services. We'd like to mirror these services, so that we can provide near 100% reliability for our users. I'm a fairly experienced Linux administrator, but don't have much experience with redundant systems. What is the best way to do this? How does google and amazon do it? Google.com resolves to multiple IP addresses, but if my local desktop caches one of the IPs that are unreachable, I'm going to get a failed connection message. How do they prevent that from happening? If one of their servers goes down, how is it automatically redirected to another system, without the end-user ever knowing it? I understand there are failover devices, but they're only for failing over the system itself, not a complete network. Let's say we have the worst-case scenario, such as my primary system becomes inaccessible. What are the fundamental components that are used on Linux systems to provide this capability? I'm looking for concepts, or approaches, not answers like "check out openstack". What are the actual pieces that make up the solution? What has to be done to implement this capability? Hopefully my question is clear. I'd like to know what the pieces are that make up a failover system and what approach is taken by successful organizations that implement it. Thanks again, Alex

  Read the article

< Previous Page | 255 256 257 258 259 260 261 262 263 264 265 266  | Next Page >