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• Migrating JBoss installation and install it on a PHP server

  - by David Martinez

  I'm configuring a new dedicated server that is going to run 3 sites, 2 of then are migrating from a old server. Each site have it's own domain and dedicated ip. 2 of this sites are already up and running on php (one of then use cakePHP), the third site is a migration from an old server and it runs on JBoss. 1) Is it possible to have both Jboss and php running on the same Apache instance, or would I have to install a new one? 2) Can I just move the old JBoss server directory to the new server and start the server with the shell script? From what I red here JBoss is distributed as a zip/tgz file with the server structure, so moving it from the old server to the new one should be the same. I want to do this because the old server is already configured, and it have 2 JBoss instances. I didn't develop this site and I don't have experience with JBoss. I have some documentation of the site, but it is not much, mostly server structure and the technology they used. The new server runs on CentOS with CPanel, I have full root access to the server. This question is similar to this one How can I run JBoss Application Server and Apache on the same server? but there he didn't have a dedicated IP for each domain.

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• Cloud service to receive up to 30000 emails a minute

  - by David

  I am building a business where I want the infrastructure to be able to handle up to 30000 emails per minute during peak periods. The question is what kinds of services offer this? I expect to download the emails using SMTP or similar. I expect each email to have a total attachment size of 2 mb, and might have several attachments. I have considered utilizing Parse API from SendGrid, but I am worried because they offer this service for free. I have contacted them and I am waiting for answer. Are there any better and more suitable alternatives?

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• MaxRequestLen error when i use https

  - by david

  When i got MaxRequestLen errors in file upload page, i set MaxRequestLen=31457280 using: <IfModule mod_fcgid.c> MaxRequestLen 31457280 FcgidIOTimeout 90 </IfModule> Now file upload works when i use http url. I have recently configured ssl for my site and when i use https url for same upload page, i get the same error: HTTP request length 131073 (so far) exceeds MaxRequestLen (131072) Is there a different setting for https? Please help. Thank you.

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• How to keep subtree removal (`rm -rf`) from starving other processes for Disk I/O?

  - by David Eyk

  We have a very large (multi-GB) Nginx cache directory for a busy site, which we occasionally need to clear all at once. I've solved this in the past by moving the cache folder to a new path, making a new cache folder at the old path, and then rm -rfing the old cache folder. Lately, however, when I need to clear the cache on a busy morning, the I/O from rm -rf is starving my server processes of disk access, as both Nginx and the server it fronts for are read-intensive. I can watch the load average climb while the CPUs sit idle and rm -rf takes 98-99% of Disk IO in iotop. I've tried ionice -c 3 when invoking rm, but it seems to have no appreciable effect on the observed behavior. Is there any way to tame rm -rf to share the disk more? Do I need to use a different technique that will take its cues from ionice? Update: The filesystem in question is an AWS EC2 instance store (the primary disk is EBS). The /etc/fstab entry looks like this: /dev/xvdb /mnt auto defaults,nobootwait,comment=cloudconfig 0 2

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• NTFS frequent corruption when writing many small files, index $I30 error

  - by david sedai

  I'm running Windows 7 Ultimate on a laptop with a 500G HDD, and had all partitions formatted as NTFS. I do a lot of programming and LaTeX typesetting, both of these involves a large amount of reading/writing/deleting to a lot of small files, such as C++ library headers or LaTeX packages. The problem is that frequently, when there is a large number of writing to files, the partition being written to often corrupts, the chkntfs e: returns dirty, where e: is the partition being written. I've re-formatted the drive, I've contacted the laptop manufacturer and had the HDD checked, the HDD is not faulty, there are no bad sectors, and I've tried a brand new HDD, to no avail, and the other partition on the same physical drive doesn't have this issue. I'm pretty sure that it's no hardware related. I've searched the Microsoft support pages, one page http://support.microsoft.com/kb/982018 provides an update for Advanced Format Disks, which I've already installed. The chkntfs log shows $130 index errors. I'm at a loss here. Can anyone help? Thanks in advance.

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• Metada for images [closed]

  - by Jose David Garcia Llanos

  i would like to develop an application to edit image's metadata, I know there are free tools for this out there but I would like to research into this and develop my own application. I am not software developer but I have the skill of learning to program really fast. Can someone please point me in the right direction, Thanks! Can it be done in Java oR VB or which language would you recommend, please guide me

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• Linux bonded Interfaces hanging periodically

  - by David

  I've several hosts that are showing problems with connectivity. When working from the command line, for example, typing is frozen for a second or so, then recovers - then it does it again. The most egregious example host would freeze (input) for 15-30 seconds, then recover and go out 5 seconds later. Switching cables didn't do anything - but removing one of the physical cables caused everything to clear up instantly (which why I think this is a network problem). Looking at the network I couldn't see any packets floating that would explain this. These ethernet interfaces (Gigabit Dell) were working normally previously, but since we moved the systems - and put them on a new set of switches - this has been a problem on multiple theoretically identically-configured hosts. The original switches were an HP Procurve 1810-24G and an HP Procurve 1800-24G connected with LLDP; the new switches are both Cisco SG 200-26, which I understand are rebranded Linksys switches. Is this caused by a problem with the switches? Is it the switch configurations? Are the Cisco switches incapable of handling this? I don't see where the configuration is located; I searched the usual /etc/sysconfig/network/devices but there's nothing in there about options (like mii polling) and nothing about the method of balancing the two. Searching scripts, I can't find anything in /etc/init.d/network either. The hosts are almost all Red Hat Enterprise Linux 5.x systems (5.6, 5.7) but some are Ubuntu Server 10.04.3 Lucid Lynx. I need help with both if it comes to that. UPDATE: We're also seeing some problems with servers on the original switches. The HP switches and the Cisco switches are also interconnected (temporarily); there is a cable run from one switch to the next. Pings on any of these hosts show about one ICMP packet out of every 5-6 getting dropped (timed out). Could there be an interaction between the two switches? Oh, and the hosts are using bonding with Balance-RR as the method.

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• Why can I not print from Google Chrome?

  - by David Faux

  When I try to print any page from Chrome on my Windows 7 machine, I get the following message. click to enlarge By the way, the gray text in the middle reads Google Chrome cannot show the print preview when the built-in PDF viewer is disabled. In order to see the preview please visit chrome//plugins/, enable the Chrome PDF Viewer, and try again. When I check my plugins, I find that Chrome PDF Viewer is already enabled. Why can't I print?

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• How to prevent HP Photosmart Essential from launching on removal drive insertion

  - by David Boike

  My in-laws bought an HP computer loaded with HP junk, and it's giving me a headache. When they insert a camera memory card into their printer, the Auto-Play dialog comes up, but it also launches the HP Photosmart Essential application, which is a piece of trash. It will NOT launch properly just normally from the taskbar, so that makes it pretty useless. I tried uninstalling it, but then when you insert a memory card, a Microsoft Help window comes up saying how to reinstall HP Photosmart Essential!! Is there any way to find the registry key (I assume) that allows a program to be launched when a memory card is inserted?

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• Encrypt temporary password using public ssh key

  - by David M. Syzdek

  I manage a virtual office and our staff uses both SSH keys and passwords for authentication. If one of our staff forgets his password, is there a way to encrypt a temporary password using his public RSA ssh key so I can send it to him via e-mail? I've seen other questions related to this one, however the "answers" generally recommend against using the public/private SSH keys to perform general encryption/decryption and do not actually state if this is possible. I would like to know if it is indeed possible and what are the steps to encrypt and then decrypt the password.

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• How to identify RAID (5 or 6) controllers that allow dynamic resize of the array

  - by David Pfeffer

  I'm building a server with a RAID5 array, based on a hardware controller. I want to be able to later add additional disks and have the array rebalance across all of the disks, enlarging the usable size. I also want to be able to later upgrade to bigger disks (one at a time, of course) and then expand the array to fill the entire drive. These features are available in Linux software raid (md). I've also heard they're available in some hardware controllers. Currently, I own the Adaptec RAID 3805 card and the 3ware 9650se card. I'd prefer to use the Adaptec if possible, but I can't find if either of these cards offer this feature. If they don't, are there other affordable (read as: sub-$600) RAID cards available that can accomplish this?

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• Requiring mulitple group membership in order to access folder

  - by David

  How would I go about creating a file or folder that requires a user to be a member of two or more different groups in order to read/write to the folder? For example, say I run an auto repair shop, and I have a folder called "Repair History" and I only want people to access it if they are members of BOTH the "Mechanics" and "Cashiers" group? This would be an AND requirment instead of an OR requirement which seems to be the norm. I know we can create a separate group that is needed to access the folder, but this is more of an academic question, since it pertains to a different security structure that we are creating. I'm not sure if MS security handles it, but I'm wondering how it would be done either way.

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• Install Windows XP/7 without a CD drive when the BIOS does not support booting from USB devices

  - by David Pearce

  I have a computer that has a dead CD drive in it and it seriously needs a new installation of Windows (XP is on it now, but Windows 7 does not sound that bad). At first I tried making a bootable USB drive, but it does not look like the BIOS supports booting directly from a USB drive. Is there some sort of boot loader that I can put onto the hard drive first and boot from the USB drive using that? If not, how else can I re-install Windows on the computer? Edit: The only bootable device the computer has it the network with PXE (although I have no idea how to do that) and it's three internal hard drives

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• What constitutes valid justification for more IP addresses?

  - by David

  I host a small website with a well known VPS service. They provided me with one IPv4 address upon registering and said additional addresses would require justification. I requested one additional IPv4 address so as to have one for a production environment and one for a testing/QA environment. They said this was unnecessary as I could just use alternative TCP ports for the test environment. I can live with using a non-standard port for non-production hosting, but it got me thinking, what would be valid justification? (I asked them and they didn't want to answer). Is there an industry standard for what counts as "valid" justification for additional IPv4 addresses?

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• Forgotten LUKS passphrase

  - by Ansh David

  i am stuck with a big problem. I have encrypted my linux drive with LUKS and now I can't remember it. During boot, it prompts me for the passphrase, but I went into troubleshooting mode and deleted the entry from /etc/crypttab so at least I can boot now into my account but that doesn't solve the problem. I can't access my drive /dev/sda5. Can someone please show me a way to crack the passphrase or is there no way around it.

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• Create room mailbox in Exchange 2007 - cannot view calendar

  - by David Neale

  I'm an application developer and I'm trying to play around with Exchange in order to integrate a room booking system with it. I've created a room mailbox and have set it so that it auto-accepts appointment requests. When creating an appointment as a standard user I can add the room as a resource and its availability will display. However, I can add it as a shared calendar to Outlook 2003 (Unable to display the folder. The Calendar folder could not be found) nor can I return the calendar folder using Exchange Web Services (again, could not find the folder). I've also created an appointment via Exchange Web Services with a room as a resource. The resource was successfully booked (as confirmed when opening it as the room's delegate) but it does not appear on the meeting as viewed by any of the attendees. Is there anything further I need to do in order to share this calendar? How do most organisations set up their Exchange with regards to rooms?

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• Best way to use mod_rewrite to replace WordPress pages with static files

  - by David Moles

  Here's the situation: I've got an old WordPress installation that I'd like to archive as static files, but I'd also like to preserve old URLs. I've already created the static archive with wget and sorted out the filenames and links. Now I'd like to configure Apache to intercept requests for the old dynamic URL and replace them with the new static one, e.g.: http://www.example.org/log/?p=1234 or http://www.example.org/log/index.php?p=1234 should redirect to http://www.example.org/log/archives/1234.html I've tried adding the following to the VirtualHost config for example.org, but to no effect -- I just get the PHP page. RewriteCond %{REQUEST_URI} /log/ RewriteCond %{QUERY_STRING} p=([^&;]*) RewriteRule ^/$ http://%{SERVER_NAME}/log/archives/%1.html [R,L] I've enabled logging and I can see what look like other rules being applied, but not this one. None of my other guesses at match patterns for %{REQUEST_URI} seem to have any effect either (log, log/, log.*, even .*). I'm new to mod_rewrite and this is mostly cargo cult, so I'm pretty sure I've gotten it wrong. Anyone know what I should be doing here?

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• having 2 ip's on a debian 7 box

  - by David

  I just installed Debian Wheezy on my homeserver. I want to assign 2 ip's to it on the same network interface, 1 static ip (eth0) and 1 dynamic ip (eth0:1). I know it doesn't make much sense but I need it to test something. I edited my /etc/network/interfaces to be like this: auto lo eth0 eth0:1 iface lo inet loopback iface eth0 inet static address 192.168.178.240 network 192.168.178.0 netmask 255.255.255.0 broadcast 192.168.178.255 gateway 192.168.178.1 iface eth0:1 inet dhcp when I bring up eth0:1 (ifup eth0:1) I get the following error (eth0 works fine) Bind socket to interface: No such device Failed to bring up eth0:1. is it even possible to have a dynamic and static ip on the same network adapter?

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• Force ntpd to make changes in smaller steps

  - by David Wolever

  The NTP documentation says: Under ordinariy conditions, ntpd adjusts the clock in small steps so that the timescale is effectively continuous and without discontinuities - http://doc.ntp.org/4.1.0/ntpd.htm However, this is not at all what I have noticed in practice. If I manually change the system time backwards or forwards 5 or 10 seconds then start ntpd, I notice that it adjusts the clock in one shot. For example, with this code: #!/usr/bin/env python import time last = time.time() while True: time.sleep(1) print time.time() - last last = time.time() When I first change the time, I'll notice something like: 1.00194311142 8.29711604118 1.0010509491 Then when I start NTPd, I'll see something like: 1.00194311142 -8.117301941 1.0010509491 Is there any way to force ntpd to make the adjustments in smaller steps?

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• Allowing outbound traffic with APF/iptables for OpenVZ container

  - by David

  I have apf installed on a OpenVZ container (proxmox 2.1). The config is pretty much vanilla and things are working. My external services like ssh and http are working. My problem is that all outbound traffic on http/https is blocked. How do I allow all outbound traffic for http/https. If I change EGF to 1 like this, all inbound and outbound traffic gets blocked EGF="1" EG_TCP_CPORTS="21,25,80,443,43,53" EG_UDP_CPORTS="20,21,53" EG_ICMP_TYPES="all" I opened a single outbound rule with the following # /usr/local/sbin/apf -a downloads.wordpress.org How do I allow all outbound traffic on http/https without blocking all traffic? Why would I allow all inbound ssh/http traffic and block all outbound traffic?

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• Virtualbox won't run Fedora 10 64 bit iso

  - by David

  I am using VirtualBox on a Ubuntu 10.04 64bit host. I would like to install a Fedora 64bit guest. When I try to run the 64bit live cd, it says "Automatic boot in 10 seconds..." after which I get a blue background with no menu options. I am familiar with Ubuntu but not Fedora. I have been able to install a Fedora 32 bit system just fine. Any suggestions? I am trying to run an rpm that won't run in Ubuntu even using alien. .

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• Ubuntu Linux: Process swap memory and memory usage

  - by David Halter

  My Ubuntu eats more memory than the task manager is showing: sudo ps -e --format rss | awk 'BEGIN{c=0} {c+=$1} END{print c/1024}' 1043.84 free -m total used free shared buffers cached Mem: 3860 1878 1982 0 20 679 -/+ buffers/cache: 1178 2681 Swap: 2729 1035 1693 That's strange. Can someone explain this difference? But what is more important: I'd like to know how much memory a process is really using. I don't want to know the virtual memory size, but rather the resident memory plus swap of a process. I have also tried to output the format param "sz" of 'ps', but the sum of this is to high (5450 MB) (param 'size' gives 8323.45 MB). Are there any other options? I really want to use this, to determine which programs/processes are eating to much memory (and swap), to kill them, because hibernate might not be working if the swap partition is to little.

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• error while loading shared libraries Dicom Store SCU / Echo SCU

  - by David Just

  I am running a dicom receiver on a Centos 6 box on top of a Xen server. If I attempt to send data to it from a remote server I get the following error: storescp: relocation error: /lib/libresolv.so.2: symbol memcpy, version GLIBC_2.0 not defined in file libc.so.6 with link time reference If I send data to the server locally it works, but sending to it from remote gives the above error. I do not think this is a problem that is specific to the storescp server.

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• Outlook keeps dropping 'Other Calendars'

  - by David Gard

  We run Exchnage 2010 with Outlook 2007, and we have public calendars that users are able to 'Add to favorites...' - these are then shown under 'Other Calendars' when a user clicks their 'Calendar' tab. The issue we are having is that these calendars drop off every now and again. Looking under 'Public Folders - Favorites', I can see that the calendars are there, but Outlook doesn't seem to know that they are calendars any more. Simply clicking on one of them to open it changes the icon to that of a 'Folder containing calendar items' for each of the favorite items, and closing and reopening Outlook gets them back under 'Other Calendars' My question is this - how can I make Outlook stop forgetting that these public folders are calendars? Thanks.

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• What is fastest way to backup a disk image over LAN?

  - by David Balažic

  Sometimes I boot sysrescd or a similar live linux on a PC to backup the hardrive over local network to my server. I noticed many times, that the transfer speed is not optimal (slower than HDD and network speed). Any rules of thumb what to do and what to avoid? What I typically do is something like: dd bs=16M if=/dev/sda | nc ... # on client nc ... | dd bs=16M of=/destination/disk/backup1 # on server I also "throw" in lzop (other are way too slow) and sometimes on the fly md5sum calculation (both of uncompressed and compress source). I try to add (m)buffer (or other alternatives) to improve throughput (and get a progress indicator). I noticed that even with enough free CPU, adding commands to the pipeline slows things down. Typically the destination is on a NTFS volume (accessed via ntfs-3g, with the _big_writes_ option).

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