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  • redundant/multi-site terminal server

    - by Adam
    Hi We have a Hyper-V cluster running 5 virtual terminal servers using HA. We need to be able make this system redundant and so if this site was to fail our users could log into the backup system at another location and access their data via the terminal servers. Any ideas? We were thinking of maybe using a NAS which replicated the data to the other location in real-time(pass-through disks)? and having a similar Hyper-V cluster setup in the backup location. However we would need to create the users in both location and create a virtual mirror without the data ie applications, directories, settings etc. Is this the best way to achieve this? We have read that using Hyper-v pass through disks is a big performance de-grade.

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  • I know how to program, and how to learn how to program, but how/where do you learn how to make systems properly?

    - by Ryan
    There are many things that need to be considered when making a system, let's take for example a web based system where users log in and interact with each other, creating and editing content. Now I have to think about security, validation (I don't even think I am 100% sure what that entails), "making sure users don't step on each others feet" (term for this?), preventing errors in many cases, making sure database data doesn't become problematic through unexpected... situations? All these things I don't know how or where to learn, is there a book on this kind of stuff? Like I said there seems to be a huge difference between writing code and actually writing the right code, know what I mean? I feel like my current programming work lacks much of what I have described and I can see the problems it causes later, and then the problems are much harder to solve because data exists and people are using it. So can anyone point me to books or resources or the proper subset of programming(?) for this type of learning? PS: feel free to correct my tags, I don't know what I am talking about. Edit: I assume some of the examples I wrote apply to other types of systems too, I just don't know any other good examples because I've been mostly involved in web work.

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  • Configure spamassassin to mark very similar messages as spam

    - by Caleb Gray
    Users on my server have been receiving spam, consistently, for some time now. I have most of spamassassin's plugins enabled, and I have made sure to enable verbose logging, where I can see that all of the plugins are working. Why is it, then, that my users are able to receive the same exact junk mail several times in a day without the message being flagged in some way? Here are the relevant headers of an email that I personally have received several copies of: X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on sub.domain.tld X-Spam-Level: *** X-Spam-Status: No, score=3.0 required=4.0 tests=BAYES_50,FSL_HELO_NON_FQDN_1, HELO_NO_DOMAIN,HTML_MESSAGE,RCVD_IN_BRBL_LASTEXT,RDNS_NONE autolearn=no version=3.3.1 Have I accidentally missed the plugin that can see that I, and others, have received the same message multiple times in a short period of time?

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  • Generalist Languages: Dying or Alive and Well?

    - by dsimcha
    Around here, it seems like there's somewhat of a consensus that generalist programming languages (that try to be good at everything, support multiple paradigms, support both very high- and very low-level programming), etc. are a bad idea, and that it's better to pick the right tool for the job and use lots of different languages. I see three major areas where this is flawed: Interfacing multiple languages is always at least a source of friction and is sometimes practically impossible. How severe a problem this is depends on how fine-grained the interfacing is. Near the boundary between the two languages, though, you're basically limited to the intersection of their features, and you have to care about things like binary interfaces that you usually wouldn't. Passing complex data structures (i.e. not just primitives and arrays of primitives) between languages is almost always a hassle. Furthermore, shifting between different syntaxes, different conventions, etc. can be confusing and annoying, though this is a fairly minor complaint. Requirements are never set in stone. I hate picking a language thinking it's the right tool for the job, then realizing that, when some new requirement surfaces, it's actually a terrible choice for that requirement. This has happened to me several times before, usually when working with languages that are very slow, very domain specific and/or has very poor concurrency/parallelism support. When you program in a language for a while, you start to build up a personal toolbox of small utility functions/classes/programs. The value of these goes drastically down if you're forced to use a different language than the one you've accumulated all this code in. What am I missing here? Why shouldn't more focus be placed on generalist languages? Are generalist languages as a category dying or alive and well?

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  • How should I structure my database to gain maximum efficiently in this scenario?

    - by Bob Jansen
    I'm developing a PHP script that analyzes the web traffic of my clients websites. By placing a link to a javascript on the clients website (think of Google Analyses), my script harvests information like: the visitors IP address, reference link, current page link, user agent, etc. Now my clients can view these statistics via a control panel that I have build. These clients can also adjust profile settings, set firewall rules, create support tickets and pay invoices. Currently all the the traffic is stored in one table. You can imagine that this tabel would become very large as some my clients receive thousands of pageviews per day. Furthermore, all the traffic data of each client would be stored in the same table, creating a mess. This is the same for the firewall rules currently, and the invoice and support system. I'm looking for way to structure my database in a more organized way to hold large amounts of data of multiple users. This is the first project that I'm developing that deals with so much data, and would like to hear suggestions and tips. I was thinking of using multiple databases to structure the data. The main database will store users data (email,pass,id,etc) admin/website settings. Than each client will have an unique database labeled prefix_userid, which carry tables holding their traffic, invoice, and support ticket data. Would this be a solution, and would it slow down or speed up overall performances (that is spreading the data over muliple databases). I have a solid VPS, but would like to safe and be as effient as possible.

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  • CPU?: Not responding

    - by James
    I'm attempting to build a system for co-location. I've been running into issues while trying to install CentOS 6.3 System Specs: Motherboard: ASUS m5a99x Process: AMD FX-8120 (8-core Bulldozer) Memory: 2x 4gb G-Skill 2133 running at 1600 I keeps giving me an error message: CPU1: Not Responding. CPU2: Not Responding. CPU3: Not Responding. CPU4: Not Responding. CPU5: Not Responding. CPU6: Not Responding. Then it instantly restarts. I have tried installing it from USB, Multiple DVDs, Multiple Distros. I have also in the bios attempted to disable cores. I was able to disable 2/3 4/5 6/7. I have also ensured that there is zero overclocking. The system works fine in a windows environment. I'm out of ideas.

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  • Does LDAP fit the role of a user database for an application?

    - by Spredzy
    I (my company) run a webservice that integrates pieces of few entreprisey-level software. Most of them offer different type of authentication but all offers at least LDAP. I was wondering if storing my application users directly in an LDAP directory would be a good idea. This way all the application I am using could rely on it for authentication purpose. I am aware that LDAP is not a database per se, but it is a datastore. I am also aware that there is no kind of constraints thus deleting a user on the LDAP directory won't do anything on my actual data, but this case would be taken care of with an extra process. My main question here is : is there any reason why I shouldn't use LDAP as my users database ?

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  • Handling UTF-8 with BOM in HTTP

    - by Alois Mahdal
    Say I have a script which at some point serves a plain text file as a content (right after "\n\n"). These files are provided by users, but I can expect they will be UTF-8. So I hard-wire Content-Type: text/plain; charset=UTF-8. But while I can teach users to save everything in UTF-8, I can't be very sure that the files will be without BOM ("\xEE\xBB\xBF"), as at least on Windows, this is not very clearly distinguished in common plain text editors and not every one of them uses the same default. So what about these files created on Windows, where they may/may not start with BOM? Should/will server or UA get rid of this debris for me? Or is it my task to prepare clean UTF-8, i.e. open each file and check whether BOM needs to be removed?

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  • What would be better in my case - apache, nginx or lighttpd ?

    - by The Devil
    Hey everybody, I'm writing a php site that's expected to get about 200-300 concurrent users browsing it. When initializing the application will load about 30 php classes, some 10 maybe 15 images and a couple of css files. So my question is what else can I do (except optimizing my code and using apc/eaccelerator for php) to get as close as possible to those numbers of concurrent users ? Currently we haven't chosen a server for the site to be hosted on but most probably it'll be a VPS Dual core + 2 or maybe 4gb ram. Is it possible for such a server to handle that load ? Also how could I test it myself and be sure that it'll be able to handle it ? Thanks in advance, Me

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  • How do I increase the open files limit for a non-root user?

    - by iCode
    This is happening on Ubuntu Release 12.04 (precise) 64-bit Kernel Linux 3.2.0-25-virtual I'm trying to increase the number of open files allowed for a user. This is for an my ecplise java application where the current limit of 1024 is not enough. According to the posts I've found so far, I should be able to put lines into /etc/security/limits.conf like this; soft nofile 4096 hard nofile 4096 to increase the number of open files allowed for all users. But, that's not working for me, and I think the problem is not related to that file. For all users, the default limit is 1024, regardless of what is in /etc/security/limits.conf (I have been rebooting after changing that file) $ ulimit -n 1024 Now, despite the entries in /etc/security/limits.conf I can't increase that; $ ulimit -n 2048 -bash: ulimit: open files: cannot modify limit: Operation not permitted The weird part is that I can change the limit downwards, but can't change it upwards - even to go back to a number which is below the original limit; $ ulimit -n 800 $ ulimit -n 800 $ ulimit -n 900 -bash: ulimit: open files: cannot modify limit: Operation not permitted As root, I can change that limit to whatever I want, up or down. It doesn't even seem to care about the supposedly system-wide limit in /proc/sys/fs/file-max # cat /proc/sys/fs/file-max 188897 # ulimit -n 188898 # ulimit -n 188898 So far, I haven't found any way to increase the open files limit for a non-root user, and I really don't want to be running my application as root. How should I properly do this? I have looked at all the posted and tried the given options but no luck!

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  • IF commands in a batch file

    - by Rossaluss
    I'm writing a small batch file to replace users' themes and charts in Office and I have the below batch file that works just fine. cd c:\documents and settings\%username%\application data\microsoft\templates echo Y|rmdir charts /s mkdir charts echo Y|del "c:\documents and settings\%username%\application data\microsoft\templates\document themes\*.*" net use o: \\servername\sms copy "o:\ppt themes\charts\*.*" "c:\documents and settings\%username%\application data\microsoft\templates\charts" copy "o:\ppt themes\Document Themes\*.*" "c:\documents and settings\%username%\application data\microsoft\templates\document themes" c: net use o: /delete Now what I want is the above to only run if it hasn't run before as we'll be pushing this out to all users for around 2 weeks to catch people that aren't in every day. Is there any way to begin the command with something to look for one of the new themes/charts already pushed down, and if it's present, then have it not run? Any help on this would be greatly appreciated as I'm pretty new to these batch files.

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  • RDS Replication across regions

    - by Bryan Migliorisi
    We are using Amazon AWS for our web services but given the recent instabilities in their infrastructure, we are trying to figure out how to run our application across multiple regions for additional redundancy. Ideally, we would run our entire app in a active-active configuration in multiple regions but our main concern is that we are using RDS, which I understand cannot replicate across regions. One possible solution (though we have not tried or proven it would work) would be to do mysqldump or EBS snapshots every hour or so but this would mean that we would be forced to run in an active-passive configuration. Our data would be at most an hour behind. This carries its own issues around data synchronization when we failover and the master comes back up, so its not the best solution. Are there any proven solutions for replicating RDS across regions?

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  • Creating floppy drive special devices under Quantal

    - by JCCyC
    First, I'd like for the various special devices for different floppy capacities (like /dev/fd0u720 etc.) to be available. I tried to adapt some udev rules I found online. I tried this, which I saved as /etc/udev/rules.d/70-persistent-floppy.rules: # change floppy device ownership and permissions # default permissions are 640, which prevents group users from having write access # first fix primary devices (/dev/fd0, /dev/fd1, etc.) # also change group ownership from disk to floppy SUBSYSTEM=="block", KERNEL=="fd[0-9]*", GROUP="floppy", MODE="0660" # next recreate secondary devices (/dev/fd0u720, /dev/fd0u1440, etc.) SUBSYSTEM=="block", KERNEL=="fd[0-9]*", ACTION=="add", RUN+="create_floppy_devices -c -t $attr{cmos} -m %M -M 0660 -G floppy $root/%k" But to no avail. It seems the create_floppy_devices script isn't provided with 12.10. How do I obtain it? Second: I'm using MATE, and whenever I log in I get a message box saying it tried to mount the drive but failed. How do I disable this? Third (which is probably related to the second): Whenever there's a disk in the drive, the motor won't stop spinning. If I do a mdir of it, after it returns, the motor stops, and then starts again. I suspect there's some process in MATE doing this. UPDATE: For CentOS 6 (who does have a create_floppy_devices program) the following rules file worked. Saved as /etc/udev/rules.d/98-floppy.rules: # change floppy device ownership and permissions # default permissions are 640, which prevents group users from having write access # first fix primary devices (/dev/fd0, /dev/fd1, etc.) # also change group ownership from disk to floppy KERNEL=="fd[0-9]*", GROUP="floppy", MODE="0660" # next recreate secondary devices (/dev/fd0u720, /dev/fd0u1440, etc.) # drive A: is type 4 (1.44MB) - add other lines for other drives KERNEL=="fd0*", ACTION=="add", RUN+="/lib/udev/create_floppy_devices -c -t 4 -m %M -M 0660 -G floppy $root/%k"

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  • usb device in dual mode on gentoo linux

    - by Idlecool
    i am having a flip flop usb modem which has two modes 1 usb mass storage mode: root@devbox:/media/F872F0FD72F0C184/Users/idlecool/Downloads# lsusb Bus 006 Device 003: ID 19d2:fff5 ONDA Communication S.p.A. 2 usbserial mode: root@devbox:/media/F872F0FD72F0C184/Users/idlecool/Downloads# lsusb Bus 006 Device 003: ID 19d2:fffe ONDA Communication S.p.A. by default whenever i plug the modem to the usb port.. the linux machine recognize it as a usb mass storage device.. how can i make it load as usbserial device i have been using a package usb_modeswitch in the past on ubuntu 10.04 but i cannt install the same package on gentoo live cd.. even udev is not installed on live cd.. how to change the product-id of the usb device on gentoo live disc without udev.

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  • how to find the clientname of an remote desktop session?

    - by Hemal Pandya
    We have servers on which we run tests and all users connect using the same credentials. The server allows 2 connections. What happens often is that one user is already active and the other two users keep hijacking the remaining session. Using query session, I can find out what are the active connections. But it does not list the client machine from where the session originates, which taskmanager displays. How do I get this information from a remote machine? I prefer a command line solution. Thanks in advance.

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  • How to 301 redirect from old query string urls to CakePHP Canonical urls?

    - by Daniel Bingham
    I currently have a .htaccess file that looks like this: RewriteCond %{QUERY_STRING} ^action=view&item=([0-9]+)$ RewriteRule ^index\.php$ /index.php?url=item/%1 [R=301] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] It is meant to 301 redirect my old query string based URLs to new CakePHP urls. This will successfully send users to the correct page. However, Google doesn't seem to like it (see below). I previously tried doing this: RewriteCond %{QUERY_STRING} ^action=view&item=([0-9]+)$ RewriteRule ^index\.php$ /item/%1 [R=301] RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?url=$1 [QSA,L] But that fails. The second rewrite rule doesn't seem to catch the rewritten URL. It goes straight through. Using the first version wouldn't be a problem, except that I suspect that is what is choking up Google. It hasn't indexed my sitemap full of the new URLs. My old sitemap had been fully indexed and all the URLs are in Google's index. But it isn't following the redirects from the old URLs to the new. I have a 'not followed' error for every one of the query urls that was in my old sitemap. Am I properly using a 301 redirect here? Is it the weird rewrite rule? What can I do to send both Google and users to the proper page and save my page rank?

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  • Java JRE 7 Automatic Upgrade and Demantra Requirements - Action Required

    - by user702295
    The following applies to ALL Demantra, EBS and Demantra Oracle Integrations: All EBS desktop administrators must disable JRE Auto-Update for their end-users immediately. See this externally-published article:     URGENT BULLETIN: Disable JRE Auto-Update for All E-Business Suite End-Users     https://blogs.oracle.com/stevenChan/entry/bulletin_disable_jre_auto_update Why is this required? If you have Auto-Update enabled, your JRE 1.6 version will be updated to JRE 7.     This may happen as early as July 3, 2012.     This will definitely happen after Sept. 7, 2012, after the release of 1.6.0_35 (6u35).  Oracle Forms is not compatible with JRE 7 yet.  JRE 7 has not been certified with Oracle E-Business Suite yet. Oracle E-Business Suite functionality based on Forms -- e.g. Financials -- will stop working if you upgrade to JRE 7. Related News Java 1.6.0_33 is certified with Oracle E-Business Suite.  See this externally-published article:     Java JRE 1.6.0_33 Certified with Oracle E-Business Suite     https://blogs.oracle.com/stevenChan/entry/jre_1_6_0_33

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  • DataContractSerializer truncated string when used with MemoryStream,but works with StringWriter

    - by Michael Freidgeim
    We've used the following DataContractSerializeToXml method for a long time, but recently noticed, that it doesn't return full XML for a long object, but  truncated it and returns XML string with the length of  multiple-of-1024 , but the reminder is not included. internal static string DataContractSerializeToXml<T>(T obj) { string strXml = ""; Type type= obj.GetType();//typeof(T) DataContractSerializer serializer = new DataContractSerializer(type); System.IO.MemoryStream aMemStr = new System.IO.MemoryStream(); System.Xml.XmlTextWriter writer = new System.Xml.XmlTextWriter(aMemStr, null); serializer.WriteObject(writer, obj); strXml = System.Text.Encoding.UTF8.GetString(aMemStr.ToArray()); return strXml; }   I tried to debug and searched Google for similar problems, but didn't find explanation of the error. The most closed http://forums.codeguru.com/showthread.php?309479-MemoryStream-allocates-size-multiple-of-1024-( talking about incorrect length, but not about truncated string.fortunately replacing MemoryStream to StringWriter according to http://billrob.com/archive/2010/02/09/datacontractserializer-converting-objects-to-xml-string.aspxfixed the issue.   1: var serializer = new DataContractSerializer(tempData.GetType());   2: using (var backing = new System.IO.StringWriter())   3: using (var writer = new System.Xml.XmlTextWriter(backing))   4: {   5:     serializer.WriteObject(writer, tempData);   6:     data.XmlData = backing.ToString();   7: }v

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  • Port numbers in Visual Studio projects and IIS

    - by aspdotnetuser
    I have a few questions about localhost and port numbers as this is an area where I do not have a lot of knowledge, and because I recently had to work with setting up Visual Studio projects and IIS and there are things I'm not clear on. I have the following questions on the things I find confusing. I thought it made more sense to include them all in one question instead of making separate questions. I have noticed a random port number is generated with projects I have worked on in the past, but I recently saw a project where the port number was fixed. What is the purpose of having a fixed/default localhost port number? i.e is it particularly useful on projects that have many programmers working on the project? If a solution contains multiple projects (for example, WCF services, Domain, MVC/Web pages), is it possible to setup a different localhost port for each of them? If so, what is the benefit of this? If a solution contains multiple projects and has different localhost urls/port numbers, must there be a corresponding website (and application pool) for each project in IIS? Or just for the project that contains the actual web pages?

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  • OpenSSH SFTP server with chroot() + File Permissions

    - by HannesFostie
    I am currently setting up an SFTP server but there is one detail I can't seem to figure out. When I add a user, I would like him to connect using his client and be able to write in his "root dir" right away. My Match case for the SFTP-users group currently has ChrootDirectory set as "/home/%u", and inside that directory I have to have a subdirectory owned by the user, while /home/%u itself is owned by root. Next to that, the "root dir" also has a couple files, .bashrc to name one. Is it possible to put these files somewhere else, remove them, or at least make them invisible to the user? Thanks EDIT: One more little thing I'd like to implement is for one account to have read (or rw, not sure yet) access to all other users' home directories. What is the easiest way to implement this?

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  • How can I setup a group writeable directory?

    - by meder
    $ whoami meder $ cd /var/www $ sudo mkdir html $ sudo groupadd web $ sudo usermod -a -G web meder $ sudo usermod -a -G web medertest $ sudo chown meder:web html $ sudo chmod -R g+rwx html The problem is, anytime I create a new file in /var/www/html even though the group is set to web, it is only writeable by the original user. I was given the advice of setting the umask to be 002 because the default is what causes the problems. But I would have to do this for all users in that group, and as far as I know it would be tedious having all of them modify ~/.bashrc to have umask 002. Even if I can do it myself with a shell command for all of those users, it still seems too tedious. Can anyone offer any advice on having a group writeable directory?

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  • Kill xserver from command line (init 3/5 does not work)

    - by John Smith
    Hi, I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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  • iTunes Sync erasing Exchange calendar / contacts

    - by Garrett
    We have had a handful of instances where corporate iPhone users will be syncing Calendar/Contacts/etc in their iTunes settings, and we would like to prevent this. Unfortunately, when they sync their empty home Outlook calendars it then overwrites everything in their iPhone calendar. This has the unpleasant side effect up "updating" Exchange and wiping out every meeting they have. Luckily, our backups have bailed us out in each case - there seems to be no recovering from it any other way as the data is gone. We prefer to allow our users to continue loading media on their phones, which we believe requires iTunes. Is there a way, through Exchange ActiveSync or iOS mobile management, to prevent this from happening?

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