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  • Tomcat performing terribly for no apparent reason

    - by John
    We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages to access when a mere 20-30 users are playing it. Big difference from 1-2 users. The entire .WAR is ~4mb, all static content hosted elsewhere. The server has never been close to running out of RAM. The CPU utilization has never been higher than 13.5-14%. Even with ~500 users that completely slowed everything to a standstill. The thread count or threadpools isn't close to being maxed out. I heightened maxthreads but it didn't make a noticeable difference. My theory is that Tomcat can only use one processor core, which would explain why it was slowed to a halt even though CPU usage was stably at 13-14% at the activity spike. But I'm struggling to understand why it would only use one CPU core. There is no processor cap in server.xml. The app contains several servlets (4 or 5). There is no mention of SingleThreadModel in the Java code. WHAT could be causing the application to run extremely slowly? If there is only 1-5 people on the application it runs fine. With 20-30 people it's barely contactable.

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  • OpenSolaris: unable to contact repository, connected to internet via proxy

    - by John-ZFS
    Opensolaris b134: unable to set packages catalog this system is connected to internet via proxy, while this works on browser, how to make console/terminal aware? user1@opensolaris134:~# pkg set-authority -O http://pkg.opensolaris.org/dev opensolaris.org pkg set-publisher: Could not refresh the catalog for opensolaris.org user1@opensolaris134:~# pkg image-update pkg: 0/1 catalogs successfully updated: Unable to contact valid package server Encountered the following error(s): Unable to contact any configured publishers. This is likely a network configuration problem.

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  • Is it possible to mount a hot-swappable drive when it is turned on?

    - by John
    In my PC, I have a hot-swap drive. Usually I keep it off to save power. I only really use it when accessing from another PC on the network. Is it possible to configure /etc/fstab to mount this drive when I turn it on (without having to shake the mouse, open file manager and click the drive to have it mounted? Currently, I have: UUID=a869e5ca-7d3b-4d64-91e2-eadbecd8c9e5 /media/i-TVShows ext4 rw,nosuid,nodev,auto,user,uhelper=udisks 0 0 in my /etc/fstab file but it doesn't seem to do the trick. I want the drive to be user-mountable, on power on, with RW access, and I'm thinking of adding 'nofail'...this is my first time writing to the fstab file, and a lot of the parameters I took from the output of 'mount' so feel free to correct any oddness you find. Thanks

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  • RHEL5: Can't create sparse file bigger than 256GB in tmpfs

    - by John Kugelman
    /var/log/lastlog gets written to when you log in. The size of this file is based off of the largest UID in the system. The larger the maximum UID, the larger this file is. Thankfully it's a sparse file so the size on disk is much smaller than the size ls reports (ls -s reports the size on disk). On our system we're authenticating against an Active Directory server, and the UIDs users are assigned end up being really, really large. Like, say, UID 900,000,000 for the first AD user, 900,000,001 for the second, etc. That's strange but should be okay. It results in /var/log/lastlog being huuuuuge, though--once an AD user logs in lastlog shows up as 280GB. Its real size is still small, thankfully. This works fine when /var/log/lastlog is stored on the hard drive on an ext3 filesystem. It breaks, however, if lastlog is stored in a tmpfs filesystem. Then it appears that the max file size for any file on the tmpfs is 256GB, so the sessreg program errors out trying to write to lastlog. Where is this 256GB limit coming from, and how can I increase it? As a simple test for creating large sparse files I've been doing: dd if=/dev/zero of=sparse-file bs=1 count=1 seek=300GB I've tried Googling for "tmpfs max file size", "256GB filesystem limit", "linux max file size", things like that. I haven't been able to find much. The only mention of 256GB I can find is that ext3 filesystems with 2KB blocks are limited to 256GB files. But our hard drives are formatted with 4K blocks so that doesn't seem to be it--not to mention this is happening in a tmpfs mounted ON TOP of the hard drive so the ext3 partition shouldn't be a factor. This is all happening on a 64-bit Red Hat Enterprise Linux 5.4 system. Interestingly, on my personal development machine, which is a 32-bit Fedora Core 6 box, I can create 300GB+ files in tmpfs filesystems no problem. On the RHEL5.4 systems it is no go.

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  • linux: automount internal hard drive during boot?

    - by John Doe
    i try to create my own NAS and i need to automount the internal sata disks during boot i know i could do using fstab but im searching for a more easy/generalized way so its easier to scale with less handwork needed for every hard drive attached (or every mainboard added to the cluster) so anyone knows how to automount internal disks without using fstab like ubuntu does for usb drives? im using ubuntu server 9.10 thx all

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  • Mac OSX server command equivalent for dhclient?

    - by John Hall
    Is there an MacOS command that makes a dhcp request, and renews the old lease, drops it for a new one, or usefully reports errors or lack of response from a dhcp server? This would both help fix networking on the machine after problems on the network without rebooting and would also be useful to diagnose wider networking problems from a mac. I can not find any command equivalent of dhclient though obviously some component must be serving this purpose. The question is, is that component exposed to a command line interface? I am biased to the command line for these features and may have overlooked settings panels or tools that might solve it using a gui interface. I believe this question is at the heart of this other question: Is there an equivalent command for 'init.d/networking restart' in OS X

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  • Copying large files from USB devices to the internal hard drive fails on Mac OS

    - by John M. P. Knox
    I have a second-generation 13" MacBook Air running Mac OS X 10.6.6 with a 2.13 GHz processor, 4 GB of RAM, and a 256 GB SSD hard disk. I often get failures when I attempt to copy a large file or large collection of files from an external USB drive (typically a "Firewire" generation Drobo) to the internal drive. The failure behaves almost exactly as if I had pulled the USB cable from the computer in mid-transfer. I get a warning that I have removed the hard disk improperly. After this event, the drive no longer appears mounted in the finder, and I have to unplug and reinsert the USB cable to mount the drive again. I have also seen a similar problem when using Aperture 3 to import a large number of photos and videos from a USB Compact Flash card reader. The import will fail and I will have to unplug the Card Reader and import the missing items. Oddly, reversing the direction of the copy seems pretty reliable. I've never had a problem copying a large file to a USB device, meaning that I have quite a few large files which are stranded on my Drobo. Model Identifier: MacBookAir3,2 Boot ROM Version: MBA31.0061.B01 I have seen a similar issue reported on Apple's website: http://discussions.apple.com/thread.jspa?threadID=2648590&tstart=0 The only suggested resolutions there seems to be switching to another form of connectivity (e.g. firewire, which does not exist on MacBook Air), or downgrading to Mac OS 10.6.4, or reverting the USB kernel extensions to the 10.6.4 versions: http://discussions.apple.com/message.jspa?messageID=12566073#12582956 I'm not too keen on the idea of downgrading kernel extensions. Does anyone know of a hardware revision without this issue that I can trade up to? Are there any other potential solutions out there?

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  • How can I enable PHP5 for a site? Having problems with every single method.

    - by John Stephens
    I'm working on a client site that is hosted on someone's DIY Debian Linux server [Apache/1.3.33 (Debian GNU/Linux)], and I'm trying to install a script that requires PHP5. By default, the server parses .php files with PHP 4.3.10-22, which is configured at /etc/php4/apache/php.ini, according to phpinfo(). On the server I can see a config directory for PHP5 adjacent to the PHP4 directory: /etc/php5.0/apache2/php.ini. I have tried multiple methods to enable PHP5 for the document root where the site's files are hosted, including all available methods mentioned here. By far, the most common suggestion I've found is to add one or both of the following lines to the site's .htaccess file: AddHandler application/x-httpd-php5 .php AddType application/x-httpd-php5 .php Trouble is, when either or both of those lines are present, the site forces my browser to download any .php files requested, without parsing the PHP at all. All of the other methods mentioned in the above article cause a 500 Internal Server Error. There is no hosting control panel I can access in a browser to enable PHP5 for the site, but I do have shell access. When I asked the server administrator about this issue, he encouraged me to search for the answer on Google. Where could I begin to troubleshoot this issue? Are there ways to test or verify the server's specific PHP5 installation and configuration, using the command line or some other method? Do you have other suggestions to enable PHP5?

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  • converting huge MPEG audio files to something smaller

    - by john
    I've got some large MPEG audio files (144 MB each) that I'm looking to convert to something smaller so I can send them out as attachments to an email. Any suggestions on the software to use? I'm looking for something free that will run on Windows. I don't really care what the destination file is, mp3 would be nice. If there's a web service out there that would do this without the need to download any software to my machine, that would be even better, but I would be more than happy just getting it done any way I can. Thanks!

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  • Lotus Notes wants to open some emails with web browser, rather than within Notes itself

    - by John K.
    I have a problem with Lotus notes 8.5.1 wanting to open certain emails in my web browser, rather than within Notes itself. The emails that do this, seem to have some html in the note (Not just a link, but the note itself) This is a recent upgrade from 8.0.2 which had a similar problem, but it showed all of the html formatting characters in the notes, rendering it almost unreadable. I was hoping a fresh install of Notes would fix it, but it did not. I am using the same version of Notes & Win XP at work, and I do not have the problem. I am guessing that it is a setting on my home computer and not Notes, but I have no idea what it would be.

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  • SSL Proxy: Forwarding without the encryption

    - by John
    I have a python application listening on port 9001 for HTTP traffic. I'm trying to configure Apache (or anything, really) to listen on port 443 for HTTPS connections, and then forward the connection, sans encryption, to port 9001 on the same machine. My application would then reply via the proxy, where the encryption would be reapplied, and returned to the client transparently. I'm not doing anything crazy with the site names and SSL certs, I have one public IP, one hostname, and one SSL cert. Stripping the encryption at the proxy doesn't seem to be a common requirement. Is what I'm asking for a normal requirement? Are there other concerns with this sort of configuration?

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  • Permissions on mac for itunes library with multiple users - idea

    - by John
    I currently have a lot of music on an external drive and my itunes set up from there. However, periodically, when the external drive isn't connected, itunes will default back to the library location of my home directory user path. I don't want to mess with an external drive, as my mac HD is large enough to house the music collection. However, I have 4 family members - all with their own logins - using this same gob of music. I don't want 4 copies of the library, only one with all libraries referencing it. So, what I want to do is: 1 - move all music files to a shared directory at /Macintosh HD/users/music. I created this directory and adjusted permissions, so all four users can read and write to this directory. 2 - get all four accounts to reference this library instead of the external or local home locations I am hoping I can just check the box to keep library organized in my account, which is the admin and let itunes move it all. Then delete current libraries for each account and re-add from the new shared location. Will the itunes organization process cause permissions issues either by setting permissions to all the files access to my account only or write permissions or any other 'gotcha'? I am having a hard time coming up with a smooth solution that won't break everything and cause me to have mega duplicates or access issues. I would prefer not to do any xml library file editing if possible. Am I dreaming? Thanks for help.

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  • change ip address verizon fios [closed]

    - by John Smith
    One well documented way to change a dynamically assigned ip address is to log into the router configuration settings and change the mac address , disconnect the router and modem, and to turn it all back on. This actually worked with a basic modem connected by ethernet directly to a laptop, spoofing laptop mac address, with a cable internet provider. Now this question is specific to fiber optic internet providers who bundle with tv and internet (verizon fios, comcast xfinity). Verizon fios installation comes with an actiontec router, and there is a built in way to clone the mac address in the router configuration settings. What will happen if the mac address changes from what verizon installed it as? Will they get angry and disconnect service? Will other services other than internet stop working (tv or phone)?

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  • Custom Filter in cPanel to Auto-Delete Emails with Russian Characters

    - by John Conde
    I get a lot of spam to my email account from Russia. The emails themselves (name, subject, body) are in Russian and I was hoping to create a custom filter in cPanel (not in SpamAssassin but in cPanel itself) to catch these emails and delete them before they hit my inbox. I've tried setting up rules to flag emails with these characters but they still are getting through. This leads me to believe that there is an encoding issue at play here. Unfortunately I do not know how to overcome this. Ideas?

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  • two operating systems sharing their file systems with eachother (Windows and Linux)

    - by John Kube
    I have two operating systems installed on my notebook computer, Windows Vista and Ubuntu Linux. When I boot up, I'm presented with a bootloader which allows me to choose which one I want to load. I'm interested in sharing each operating system's file system with the other, such that I could access my Windows files from Linux and vice-versa. Is this possible, and if so how would one go about setting it up? Feel free to just post a link to an existing solution if there is one. I would Google for this myself, but I don't even know what to search for, as I don't know what this is called.

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  • AutoHotKey - change mouse position and click a specific key every time window comes up

    - by John
    I'm a newbie to AHK, learning the basics. I'm using Notepad as an example - I want to hit the Cancel key every time I close Notepad and it asks if I want to Save/Don't Save/Cancel. I've come up with the script below and it works once but then I have to reload the script to do it again. I want it to hit Cancel every time the question box comes up. I thought Loop would work but am doing something wrong. Any ideas why, anyone? Loop IfWinExist Notepad, { WinWait Notepad WinActivate Click 312, 109 return }

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  • 16TB Volumes and SNMP On Windows

    - by John K
    As volumes larger than 16TB became more common, it was recognized that the 32 bit value used to report disk size and usage within the standard "HOST-RESOURCES" MIB in SNMP was not large enough to report the proper disk size. Net-SNMP seems to have addressed this issue by simply manipulating the value of "AllocationUnits" to maintain a 32 bit value for disk utilization (since total disk size/usage is equal to the 32 bit space value times the allocation unit), to allow for the calculation of a volume larger than 8/16TB. Presuming you don't have any reporting interest in the allocation unit, this seems like a fine solution. https://bugzilla.redhat.com/show_bug.cgi?id=654384 Window's built in SNMP service, however, seems to continue to suffer from this error, simply reporting the modulo of the used/assigned disk space, resulting in inaccurate disk size reporting. Is there a way to enable Windows to correctly report disk usage for volumes over 16TB? We attempted to simply install Net-SNMP 5.5 x64 and disable Windows SNMP service entirely, however this unfortunately did not fix our issue. I've seen people in the Cacti community mention simply scripting out a solution. Unfortunately, we're using Observium for quick and basic systems monitoring. If the issue can't be correct on the Window's side, can Observium be made to report custom MIBs?

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  • Why doesn't environment variable get updated in cmd without restart?

    - by John Nevermore
    CMD commands: setx SOMEVARIABLE "newpath" /M setx SOMEVARIABLE "%SOMEVARIABLE%;newpath2" /M Expected output on ECHO %SOMEVARIABLE%: newpath;newpath2 Actual output: %SOMEVARIABLE% Actual value stored (From System Properties-Environment Variables GUI): %SOMEVARIABLE%;newpath2 The only way i can get the expected output is, if i restart the command prompt every time i modify the environment variable. I'm using this command to automate environment variable value appending multiple times during the same process. Why doesn't environment variable get updated in cmd without restart? Is it possible to get the updated value of %SOMEVARIABLE% without restarting the command prompt?

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  • Installing make with wget

    - by John
    How can I install make with wget on CentOS? I tried: cd /tmp wget ftp.gnu.org/pub/gnu/make/make-3.81.tar.gz tar xfz make-3.81.tar.gz cd make-3.81 PATH=/usr/local/bin:/usr/bin:/bin ./configure patch -p1<make-3.81-cygwin.patch patch -p0<make-3.81-cygwin_MAKE_expansion.patch PATH=/usr/local/bin:/usr/bin:/bin make PATH=/usr/local/bin:/usr/bin:/bin make install However, I got an error message stating I had no acceptable C compiler.

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  • Speeding up Outlook Express on Windows XP over satellite

    - by John
    My brother is in the field with Doctors Without Borders. I'm posting this question on his behalf. We use outlook express (on a pc running windows XP) and a 9600 baud dial up satellite phone modem to get our email direct from the server in Paris. As this is a very expensive way to communicate (our satellite bill is $50K a year, no joke), it seems like trying to streamline is a good idea. Here's the question- when we connect, the sequence goes: Send outbox mails. This goes pretty quickly, probably 10-15 seconds for each email, up to maybe a couple minutes for an email of 150k or so). The status bar moves pretty quickly, according to the emails sent. The system then says "Checking for new messages on (our account name), and "Receiving list of messages from server". This takes a long time. Like 10-15 minutes. The status bar crawls along. Then it receives the messages. "Receiving messages from server". Again, each message takes 10-15 seconds, and this part moves along reasonably fast. I'm curious as to what is going on in the second part. It takes forever, and doesn't seem to be part of the sending or receiving messages themselves. Is there a way to speed up the process by changing a preference with communicating with the server or something? Does anyone have any advice for him speeding up what Outlooks Express is doing? Obviously his software is ancient and adding more software is not realistic based on the connection speed. Thanks!

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  • Are whole VM images backed up on Amazon EC2/S3?

    - by John
    I've been trying to get my head around Amazon Web Services as a VPS provider. My understanding is a EC2 instance running Windows is basically a Windows VM, very similar to renting a VPS from a more traditional hosting provider. I don't want to have complex backups, either to administer or to restore - if my restore involves installing SVN, MySQL, Jira, etc on a new box before I can even try to restore the backup then it's not great to me. What I really want is a service which backs up my entire VM... if the PC running the VPS dies then the VM image is installed on a new PC and off we go again. With Amazon being all about flexibility and elasticity, I wondered if they have this service? I can't figure it out from reading their docs.

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  • eMail with Conflicting Headers not blocked in MS365

    - by John Meredith Langstaff
    On occasion, a company receives eMail with two header fields (“Received” and “From”) containing data that contradict each other drastically. Should they not expect their anti-spam system to flag or block items with contradictions in these fields? For example, they received an eMail which contained [almost exactly] these two headers: Received: from [107.52.51.26] by web315204.mail.ne1.yahoo.com via HTTP; Mon,28 Oct 2013 04:28:04 PDT From: Barry Smith [email protected] Obviously, eMail from an @att.net address isn’t coming from a server on the domain yahoo.com, and Yahoo isn’t forwarding AT&T’s eMail. There were no other headers indicating that the item was sent “OnBehalfOf”, or “Forwarded-by”, or “By_Proxy” or any other such. Should I write a utility to scan incoming eMail for such conflicts, or look more closely at their spam filtering to block this kind of eMail? Their eMail system is Hosted Exchange on MS-365. My central question is, where specifically do I look in MS-365 to get this type of conflicted eMail blocked?

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  • Multiple CAS servers with Microsoft Exchange and selective authorization

    - by John Wilcox
    I have a Microsoft Exchange 2010 organization within one Microsoft Windows domain and I have users accessing it through OWA. For simplicity lets say I currently have one CAS server (CAS 1) which is accessible only through a VPN connection. Lets call the users connecting to the first CAS group a. For some users though, I need to install another CAS server (CAS 2) so that they can connect without using a VPN connection. Lets call those users group b. What I need to achieve is that group a can only log in to CAS 1 and group b can only log in to CAS 2. Now I know that one can disable/enable OWA per user but in my case that is not enough because OWA must be enabled for both groups.

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