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  • Apache mod_jk replacing mod_rewrite rules

    - by organicveggie
    We have a slightly complex Apache 2.2 setup in front of a Tomcat 6.0 instance. The main Tomcat webapp is deployed in: /opt/tomcat/webapps/ROOT But we also have static content that we update semi-regularly. We didn't want to force a new build and deploy of the webapp, so that's stored separately in folders like: /opt/tomcat/webapps/css /opt/tomcat/webapps/foo /opt/tomcat/webapps/bar To handle this from Apache, we use mod_rewrite and rules look something like the following: RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^/css/(.*)$ - [L] RewriteCond ROOT/%{REQUEST_FILENAME} -f RewriteRule ^/css/(.*)$ ROOT/$1 [L] RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^(.*)\.(jpg|png|html|js)$ - [L] RewriteCond ROOT/%{REQUEST_FILENAME} -f RewriteRule ^(.*)\.(jpg|png|html|js)$ - [L] RewriteRule ^/(.*)$ http://localhost:8080/$1 [P,L] ProxyPassReverse / http://localhost:8080/ I now think I might want to start using mod_jk and I have two questions: Is it even worth using mod_jk? I don't need load balancing. Is it even possible to handle the cases I outlined where the static content is referenced as "http://www.example.com/css/foo.css", but we don't know if it's located in the Tomcat webapp or in one of the static folders.

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  • Turn off the Linux OOM killer by default?

    - by Peter Eisentraut
    The OOM killer on Linux wreaks havoc with various applications every so often, and it appears that not much is really done on the kernel development side to improve this. Would it not be better, as a best practice when setting up a new server, to reverse the default on the memory overcommitting, that is, turn it off (vm.overcommit_memory=2) unless you know you want it on for your particular use? And what would those use cases be where you know you want the overcommitting on? As a bonus, since the behavior in case of vm.overcommit_memory=2 depends on vm.overcommit_ratio and swap space, what would be a good rule of thumb for sizing the latter two so that this whole setup keeps working reasonably?

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  • Should websites live in /var/ or /usr/ according to recommended usage?

    - by nbolton
    According to a guide on the Linux directory structure, /usr/ is for application files, and /var/ is for files that change (I assume this means "files that belong to the applications"). Is this correct? If this is the case then I'm a little torn between using either. A website is an application (if it's dynamic, so to speak), but in other cases it is just a collection of files used by Apache. The default www dir lives in /var/www/, so should we follow suit by using /var/websites/ (or something similar), or choose /usr/websites/ since they could be applications? This is a very trivial question, but it's bugging me nonetheless. For our case, I'm leaning toward /usr/web or something like that, since our websites are all applications. Update: This is for our company websites; it's not a shared hosting server, so we don't need to worry about separating them in /home/ or anything like that.

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  • database replication for new user signup

    - by Jeff Storey
    I have a database that stores the users of my application. When a new user signs up, a record is inserted into the database for that user. I have a replicated version (slave) of this database (using mysql for now). What I'm concerned about is this scenario: step 1: user signs up and user record is inserted into the database step 2: user then tries to login, and the login process queries the database for the user. however, this query hits the slave database, but the user record has not yet been replicated in the slave and it returns an error that the user does not exist. This is a pretty trivial example, but I can see how it can apply to a lot of cases. Is there a strategy for configuring replicated databases to help prevent this situation?

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  • How can I grant read-only access to my SQL Server 2008 database?

    - by Adrian Grigore
    Hi, I'm trying to grant read-only access (in other words: select queries only) to a user account on my SQL Server 2008 R2 database. Which rights do I have to grant to the user to make this work? I've tried several kinds of combinations of permissions on the server and the database itself, but in all cases the user could still run update queries or he could not run any queries (not even select) at all. The error message I always got was The server principal "foo" is not able to access the database "bar" under the current security context. Thanks for your help, Adrian

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  • VoIP Tunnel Implementation for SIP Client

    - by Mahendra
    I am planning to provide an option for tunneling in my SIP client. I have tried to search on web for open-source implementation of this, but couldn't find one. My questions are: 1) If I go writing down my own custom code for implementing the feature - What are the different parameters / cases that I should consider & what should be my approach to start it? 2) Is there any open source implementation for SIP Tunneling already available? Any inputs are appreciated. Thanks.

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  • IDN and HTTP_HOST

    - by Sandman
    So, when I want to link my users to a specific page I always use (in php): "http://" . $_SERVER["HTTP_HOST"] . "/page.php", to be sure that the link points to the page they're currently surfing (and not one of the server aliases). But with IDN names, HTTP_HOST is set to "xn--hemmabst-5za.net" (for example) - which of course works but doesn't look very nice. Is there a way to have HTTP_HOST set to the correct IDN name in these cases (in this case - "hemmabäst.net")? I rather do it in Apache before it comes to PHP, because otherwise I'd have to replace all my usage of $_SERVER["HTTP_HOST"]. Any ideas?

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  • USB Keyboard not working under windows 7 x64?

    - by Comboo
    I have two usb keyboards, one no-name cheapo thing and an old logitech. When i plug them in to my computer they pop up in device manager as "Unknown device" respective "USB-receiver". Both of them fail to install any drivers, neighter automatically or through windows update. Both keyboards work perfectly on another computer i have with vista 32bit. Can this be one of those cases where a device does not work in 64bit version of windows? I doubt it though since I've never had that problem before with any device and i thought that basic things like keyboards would be kind of failsafe. I don't really know how to start debugging this issue. I've tried all the obvious, rebooting, changing usb-port etc. Are there any generic x64 keyboard drivers you can use? Is there any way to find the manufacturer of the keyboard over usb? There is nothing written on it.

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  • "Manual threading" in Thunderbird?

    - by sleske
    I use Thunderbird's threaded view of email messages to group emails together which are related. However, sometimes people will reply to messages using some mail program which does not properly set the headers to tell it's a reply, or will even write a new mail instead of replying. In these cases I would like to manually assign or "dock" a mail to an existing thread. Is there some way / addon to do this in Thunderbird? I'm thinking along the lines of a context menu "attach mail to thread XXX". The mail would then become part of that thread (maybe with a special marker explaining that it was manually grouped).

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  • linux refused to mount a valid partition

    - by greg
    My setup is a linux box with 1 partition used thought LVM - has been working for years. I add a freeze and after the reboot the partition cannot be mounted: mount -r -t ext3 /dev/pve/data /mnt/pve-data mount: wrong fs type, bad option, bad superblock on /dev/mapper/pve-data, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so However fsck doesn't see any problem with it: fsck.ext3 -fp /dev/pve/data /dev/pve/data: 3024076/60366848 files (0.6% non-contiguous), 156921642/241435648 blocks There's nothing in dmegs nor the syslog. I'm puzzled, what's wrong with my partition? Thanks in advance greg debian 5.0.10 LVM 2.02.39

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  • Nested RDP and ILO/VMWare console sessions, latency and keystroke repetition

    - by ewwhite
    I'm working on a remote server installation entirely through ILO. Due to the software application and environment, my access is restricted to a Windows server that I must access through RDP. Going from that system to the target server is accomplished via HP ILO2 or ILO3. I'm trying to run a CentOS installation in an environment where I can't use a kickstart. I'm doing this via text mode, but the keystrokes are repeating randomly and it's difficult to select the proper installation options. For example: ks=http://all.yourbase.org/kickstart/ks.cfg ends up looking like: ks====httttttp://allll..yourbaseee.....org/kicksstart/ks.cccfg I'm doing this using Microsoft's native RDP client (on Mac and Windows). I've also noticed this before when running installations or doing remote work in nested sessions. Same for typing into a VMWare console in some cases. Is there a nice fix for this, or it it simply a function of the protocol(s)?

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  • File association for editing on a mac

    - by Agos
    I'm quite experienced with how file association works for opening files on Mac OS X. I recall reading somewhere that OS X keeps not only the information about which apps can open a file, but also which apps can edit a specific file type. I'm having problems with those applications (Coda, Espresso, Forklift, Flow) that have an “edit with external editor” feature, since issuing this command on HTML files opens them with Dashcode. Dashcode of course is not the current association for opening these files (Safari is), so it's clearly looking for apps that can edit HTML. Since I'd like to use TextMate as my editor in these cases, how can I set this preference?

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  • excel chart dynamic range based on values

    - by andrewk
    I'm trying to create a chart that auto updates itself from a data provided. The range of the chart is always fixed/locked. The issue I'm facing is that when a value for a certain month is 0, I want it to skip to the last non-zero month . Meaning the ranges selected forming the chart should exclude the month with the value zero. Which in most cases is the top month. The image below should clear it up. Is there a way to have the chart range be dynamic based on certain values?

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  • Remove auto-complete field entries in Google Chrome

    - by NT.
    Is there a way to stop the gmail address field (on the login page) from displaying all the gmail addresses that you have ever typed in it? When logging in with Google Chrome or trying to set up a new account, anything you type which starts with the same letter as the one that you are trying to use currently will show up in the auto-complete field, I don't want that. I understand that this is a convenient feature in some cases, but the thing is--I know this shouldn't've happened, but it has actually happened more than once--I sometimes mistyped my password in the Gmail address field right after the address, mistakingly assuming that the prompt had already been moved to the password field, and then hit "Enter" without looking first. The next time I tried to enter my Gmail address, it popped up the address followed by my password as one of the entries on the list of email addresses that shows up, and I couldn't get rid of the entry. Is there a way to remove these?

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  • Xeon X5550 vs Six-core Opteron for database server

    - by gregmac
    I'm specing out a database server, and the price works out to be reasonably close between an Intel X5550 Quad-core and an AMD 2425HE (2.1Ghz) Six-core Opteron. I've been looking for some comparisons between the two, but the only thing useful I've found is an AnandTech Review of the 2435 which compares it to Intel Xeons, but concludes they both have their place. My load is MS SQL Server 2008, with an OLTP database that has about an equal amount of reading/writing (and it's a reasonably heavy load). So my question is, what is going to work better in this situation, assuming the drives are the same: Xeon X5550, with 16GB 1333Mhz RAM (Dell R510) or an Opteron 2425HE (2.1Ghz) or 2439SE (2.8Ghz) with 16GB of 800Mhz RAM? (Dell 2970) Note: the 2439 adds $500, but the overall pricing works out that it's not that much more than the R510. Using the 2425HE, the Dell 2970 server is slightly less than the similarly-equipped R510). If it adds a decent amount of performance, it's worthwhile to go faster. (single CPU, in both cases).

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  • How can you make a Windows USB HDD Modify All for All Users

    - by David Allan Finch
    Hi, I use a USB HDD a lot between lots of different Windows Boxes. What I find after a while is that there get to be lots of different Permission on the files in some cases stopping me looking at files or removing them. They want Admin rights or even sometimes you need to put the disk back into the original machine with the original user. This is a right pain. Is there away of making the disk have Modify All for All Users and making this the default for all files on the disk. Thanks

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  • What are the benefits of running chef-server instead of chef-solo?

    - by strife25
    I am looking at automated deployment solutions for my team and have been playing with Chef for the past few days. I've been able to get a simple web app up an running from a base Red Hat VM using chef-solo. Our end goal is to use Chef (or another system) to automatically deploy application topologies to the cloud as we run builds. Our process would basically run like so: Our web app code, dependencies, and chef cookbooks are stored in SCM A build is executed and greats a single package for images to acquire and test against The build engine then deploys new cloud images that run a chef client to get packages installed. The images acquire the cookbooks from SCM or the Chef server and install everything to get up and running What are the benefits and/or use cases for getting a Chef Server running? Are there any major benefits to have a Chef Server hold and acquire the cookbooks from SCM vs. using chef-solo and having a script that will pull the cookbooks from SCM?

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  • Set certain WSUS updates to auto-install

    - by Nicolas
    We're running a WSUS server for the simple purpose of caching updates. Since we are a very small network of all "power users", we've got the domain group policy for WSUS updates on the clients set to prompt for download/install. i.e. We don't want updates to install without our knowledge. But there are a few cases where it would be nice to be able to set a certain update to auto-install. e.g. Windows Defender updates, Malicious Software Removal Tool, Outlook Junk Email Filter, etc. Basically all the silly little updates that you would always install anyway and don't require a restart. Is there a way to set the general policy to prompt for download/install, but auto-install certain regular updates? P.S. WSUS itself does have the facility to auto-approve certain updates. That part works. Facts & Figures: SBS 2003 domain Windows 7 Pro clients Windows XP Pro clients

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  • Running scripts from another directory

    - by Desmond Hume
    Quite often, the script I want to execute is not located in my current working directory and I don't really want to leave it. Is it a good practice to run scripts (BASH, Perl etc.) from another directory? Will they usually find all the stuff they need to run properly? If so, what is the best way to run a "distant" script? Is it . /path/to/script or sh /path/to/script and how to use sudo in such cases? This, for example, doesn't work: sudo . /path/to/script

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  • kernel software trap handling

    - by Tony
    I'm reading a book on Windows Internals and there's something I don't understand: "The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread invokes kernel functions related to the software interrupt." So does this mean that software interrupts or exceptions will only be handled under these conditions: a. When the kernel is executing a function from said thread related to the software exception(trap) b. when it is already handling a hardware trap Is my understanding of this correct? The next bit: "In most cases, the kernel installs front-end trap handling functions that perform general trap handling tasks before and after transferring control to other functions that field the trap." I don't quite understand what it means by 'front-end trap handling functions' and 'field the trap'? Can anyone help me?

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  • Unknown MySQL server host - connection problem

    - by Zukas
    I am new to databases and I have been asked to look at a few tables and see how many records they have and some other information. I cannot access phpMyAdmin through cPanel, which is how I've always done it on my own server. I decided to download MySQL Workbench. I enter in all the information is asks: Hostname: mysite.startlogicmysql.com Port: 3306 Username: user. I press connect and get this Unknown MySQL server host 'mysite.startlogicmysql.com' (11004) Am I using the wrong hostname? I've seen a server name, a hostname in the server variables list which is something like custsql.eigbox.net and the server itself is custsql.eigbox.net In both cases the custsql is a little different than what I posted. I am not sure which one to use. If there is anything else anyone needs to know I can tell you. Tanks.

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  • Apps crashing - Android 4.3 in VirtualBox

    - by Nasenbaer
    Performance and stability problem with Android 4.3 in VM. Tried with x64 and x86 System. VirtualBox V4.3.2 in use. Android could be installed on x86 only. But there it seems to be successfully, using the "Linux 2.2" template on VirtualBox. 1024MB RAM and 2GB Harddisk defined. Some times Android browser is crashing and closing. In all cases stuff like "Skype" and "Plats vs Zombies" does never startup after installing. Crashes directly. "Plats vs Zombies 2" is not able to install. Is there any way of gettings such stuff work?

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  • Can I trust that ZFS is consistent between Linux and FreeBSD?

    - by iconoclast
    I'm planning to build a FreeNAS box sometime soon, but if ZFS on Linux eventually proves to be reliable, I might want to switch, just to have a more familiar OS. So I'm wondering if I can trust that the different implementations of ZFS are compatible. In other words, if I just swap out the boot disk from FreeNAS to Linux or OpenIndiana, can I trust that nothing bad will happen to my data? This may seem like a stupid question--obviously it ought to be compatible--but I'm guessing that ZFS isn't commonly used in cases where drives are moved between computers, so I'm hoping someone can provide a better answer than just "it ought to be".

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  • SQL 2008 Mirroring, how to failover from the mirror database?

    - by Luis
    I have configured a database mirroring setup in SQL 2008 using the High-safety, Synchronous mode, without automatic failover. I don't have a Witness instance. Regarding high availability, I understand Mirroring is a better strategy than Log Shipping (faster and smoother failover), and cheaper than Clustering (because of license and hardware costs). According to the MS docs, to do the failover you need to access to the Principal database and in the "Mirror" options click the "Failover" button. But I want to do this from the Mirror database, because what would be the benefit as all this setup is being done in case the Principal server knocks down? Evidently I am missing something. If Mirroring is not a solution for server downtime (as would be Clustering, if I understand correctly), then which practical (i.e. real world examples) cases would benefit from Mirroring for high-availability purposes? Thank you very much for your response! I really need some enlightment.

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  • How to clean up an unprocessed orphan inode list?

    - by bmk
    I tried to mount a formerly readonly mounted filesystem read-writeable: mount -o remount,rw /mountpoint Unfortunately it did not work: mount: /mountpoint not mounted already, or bad option dmesg reports: [2570543.520449] EXT4-fs (dm-0): Couldn't remount RDWR because of unprocessed orphan inode list. Please umount/remount instead A umount does not work, too: umount /mountpoint umount: /mountpoint: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) Unfortunately neither lsof of fuser don't show any process accessing something located under the mount point. So - how can I clean up this unprocessed orphan list to be able to mount the filesystem again without rebooting the computer?

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