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• What differences are there between an official Ubuntu AMI image and a base install from an ISO?

  - by David Winter

  When creating a new instance on AWS using an official Ubuntu 12.04 server AMI, what differences are there compared to if I was to do a standard server install on a computer of my own? For example, the default user is 'ubuntu'. An SSH public key is added to that users authorized_keys file. Sudo is passwordless for that user. PasswordAuthentication is disabled for SSH. etc etc. Configurations have been changed from their defaults, and I'd like to know if there is a list, or somewhere I could find out the modifications made.

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• Can't reliably ping 6224 router from directly-attached system

  - by David Mackintosh

  OK, here's my situation. This is on the internet. The 6224 is the router in this picture and physically resides in Kanata. Both VLAN 1697 and 3994 are provided by an internet service provider. These VLANs are provided through a single 1Gb ethernet wire. The Kanata hosts are directly attached to the 6224; the other two sites are remote. VLAN 3994 is a single IP address space, so theoretically it shouldn't matter physically where the hosts on that subnet are. Here's the problem. I have a monitoring system which is connected further into the internet, so probes from the monitor would come in to this diagram on the 1697 VLAN. When I ping hosts at Albert or Bells Corners from the internet, there is 0 loss. The connection looks perfect. When I ping hosts at Kanata, I lose anywhere from 10 to 40% of the pings. The loss is not predictable, but: when I do lose them, I always lose at least 3, usually 4, rarely more, pings in a bunch. I have attached a monitor directly to the 6224 in Kanata on 3994.. When the monitor pings the 6224 routing interface, I see exactly the same loss pattern -- but NOT at the same time as the loss from the remote system. Ping time is around 1ms. When the monitor pings another system directly attached to the 6224, there is 0 loss. Ping time is about 0.1ms, one-tenth of the time to ping the router. Anyone know what is going on here?

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• My laptop can't share a printer with my PC

  - by david

  I have a Belkin wireless router and all devices including my laptop can connect to the internet. However I can't get my laptop running on Windows XP to connect to my printer through my PC running on Windows Vista. I read all the posts but nothing works. I get an error message on my laptop saying 'The name of my network' doesn't give me permission. How do I change this?

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• How do I examine my Windows firewall outbound rules?

  - by David

  I need a program to listen to port 9000 on localhost with my Windows firewall. I've created an outgoing and an incoming rule for my program but I can only see my incomming rule in the Windows firewall general menu? I've also noticed that I've many more outgoing rules in my outgoing rule menu but I can only see 4 outgoing rules in my general firewall menu but I see many many more incomming rules? The program doesn't listen to port 9000 or it doesn't working. I've also tried netstat -a -p to no avail. I didn't see 0.0.0.0:9000 in the output? How can I check if my program listen to port 9000 or connect to port 9000 when it's open?

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• Windows 7 Home Premium - Unable to View Chinese Characters Properly

  - by David

  Is there a proper and permanent fix that will restore the display of Chinese Characters on a Windows 7 Home Premium Laptop computer? This problem has been occurring frequently now and a simple reboot no longer does the trick. The square boxes viewed on many applications and websites has been constantly bothering me and I wish to fix it asap. I have done a lot of research on it but have not been successful. Many responses were to install the language packs for Windows 7 Ultimate Users which apparently is not my case or to configure the "Region and Language" settings of the Control Panel, changing the system locale. Does anyone have any suggestions? All would be appreciated!

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• Installing Java 6 on Ubuntu 10.04 fails on missing Java 6 JRE package

  - by David S

  I'm trying to install Java 6 on Ubuntu 10.04 and it's been harder than it should be. In another question about installing Java on Ubuntu/Linux it said that I needed to do the following: sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" However, that failed and I kept getting: sudo: add-apt-repository: command not found The solution to this, was to run: sudo apt-get install python-software-properties So, that seemed to work and the command above to "add-apt-repository" seems to complete with no errors. And I have run the following to confirm it got added. sudo vi /etc/apt/sources.list But, now when I run the following: sudo apt-get install sun-java6-jre I get: Reading package lists... Done Building dependency tree Reading state information... Done Package sun-java6-jre is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package sun-java6-jre has no installation candidate Where do I go from here?

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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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• Help needed- subdomains

  - by user205296

  Hi, I have a subdomain named http://arun.rocks.com and another domain named www.rocks.com/projects/main.php/. I want my subdomain to always redirect to www.rocks.com/projects/main.php/. How to do this? Kindly help

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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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• 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 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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• 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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• SQL2005 reporting server: intense security activity

  - by David Wimbush

  On my reporting server the Security log shows large numbers of Logon/Logoff events, often 10 or more, when you run pretty much any report in the Report Manager. Is this normal or is it a classic sign of having the wrong setup? Some system details: Windows Server 2003 R2 SP2, virtual server running under VMWare). SQL Server 2005 SP3 Standard Edition, running databases, Report Manager, and Ananlysis Services cubes. No other major services on the machine (i.e. it's not a domain controller, Exchange server or anything like that). Any ideas, please, guys?

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• What happened to “allow application to interact with desktop” checkbox in cluster manager for server

  - by David

  The cluster managing software for managing clusters on a windows server 2005 cluster had a checkbox for "allow application to interact with desktop" when creating a generic application resource. This appears to be gone in the management software for server 2008 clusters. Does anyone know where this option, if it still exists, is?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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