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• What can cause a kernel hang on redhat 4?

  - by Ivan Buttinoni

  I've to solve a nasty problem on a ten machine "cluster": randomly one of these machine hang during an hard computation, sometime still ping sometime not. The problem was described me at the phone, I've still no touch/see these machine, so I can't be more precise. It seem there's no (real) keyboard or monitor linked to them, so I haven't nothing about keyboard led or messages on monitor. Don't worry, what I really need is some suggestion where to search the problem, some suggestions on what can cause a kernel hang on a working machine. I also see this post, but seem same need on a different situation. My ideas since now: - HW problem (ram, cpu, fan etc.) - bad autofs configuration - bad nfs(?) configuration - presence of a trojan/hacker/etc - /dev/"swap" linked to /dev/zero - kernel out of memory(??) - kernel bugged In other words I try to imagine what kind of envent can occour that can crash the kernel insted of the application that generate the event. What hang have YOU experienced before? Write it to me! TIA

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• D-LINK DIR-615 router keeps giving my wireless devices bad ip addresses

  - by mlsteeves

  I have a D-LINK DIR-615 router, and wired devices have no problem getting an IP, however; wireless devices end up with a 169.254.. address (subsequently, they cannot access the internet through the router). I have removed all wired connections from the router, so there is no other dhcp server running. I've also gone back to the store, and replaced it with another, thinking that maybe it was defective. According to the router, it gave 192.168.0.101 to the wireless device. According to the wireless device it got 169.254.67.71. I've tried both a laptop and an iPod Touch, both exhibit the same behaviour. Has anyone seen this type of behaviour, or have any ideas of stuff to try? NEW INFORMATION I looked at the logs on the router, and when the wireless device tries to connect, this is what is logged: Sep 10 18:13:39 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:31 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:26 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:23 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:21 UDHCPD sending OFFER of 192.168.0.111 I connected a computer directly to the router, and here is what it looks like: Sep 10 18:14:18 UDHCPD Inform: add_lease 192.168.0.110 Sep 10 18:14:14 UDHCPD sending ACK to 192.168.0.110 Sep 10 18:14:14 UDHCPD sending OFFER of 192.168.0.110 Not sure if that helps or not.

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• Is there a limit setting a php_admin_value in php-fpm?

  - by PeeHaa

  I am trying to set a large value in the configuration of a pool in php-fpm, but at some point it just doesn't start anymore. php_admin_value[disable_functions] = dl,exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source,pcntl_exec,include,include_once,require,require_once,posix_mkfifo,posix_getlogin,posix_ttyname,getenv,get_current_use,proc_get_status,get_cfg_va,disk_free_space,disk_total_space,diskfreespace,getcwd,getlastmo,getmygid,getmyinode,getmypid,getmyuid,ini_set,mail,proc_nice,proc_terminate,proc_close,pfsockopen,fsockopen,apache_child_terminate,posix_kill,posix_mkfifo,posix_setpgid,posix_setsid,posix_setuid,fopen,tmpfile,bzopen,gzopen,chgrp,chmod,chown,copy,file_put_contents,lchgrp,lchown,link,mkdi,move_uploaded_file,rename,rmdi,symlink,tempnam,touch,unlink,iptcembed,ftp_get,ftp_nb_get,file_exists,file_get_contents,file,fileatime,filectime,filegroup,fileinode,filemtime,fileowne,fileperms,filesize,filetype,glob,is_di,is_executable,is_file,is_link,is_readable,is_uploaded_file,is_writable,is_writeable,linkinfo,lstat,parse_ini_file,pathinfo,readfile,readlink,realpath,stat,gzfile,create_function When trying to restart php-fpm it fails with the following message: Stopping php-fpm: [ OK ] Starting php-fpm: [20-Oct-2013 22:31:52] ERROR: [/etc/php-fpm.d/codepad.conf:235] value is NULL for a ZEND_INI_PARSER_ENTRY [20-Oct-2013 22:31:52] ERROR: Unable to include /etc/php-fpm.d/codepad.conf from /etc/php-fpm.conf at line 235 [20-Oct-2013 22:31:52] ERROR: failed to load configuration file '/etc/php-fpm.conf' [20-Oct-2013 22:31:52] ERROR: FPM initialization failed [FAILED] When I remove the last disabled function (create_function) it start again. I also tried with other functions, but this gives the same error so it's not related to the create_function function. The string currently is just over 1KB in size so it looks like I have hit a limit here? Is my assumption correct? Is there a way to overcome this limit? I also tried to add another php_admin_value[disable_functions] underneath it (hoping it would be appended), but that didn't work (it just used the first one).

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• Startup script for Red5 on Ubuntu 9.04

  - by user49249

  I am creating startup script for Red5 on Ubuntu. Red5 is installed in /opt/red5 Following is a working script on a CentOS Box on which Red5 is running [code] ==========Start init script ========== #!/bin/sh PROG=red5 RED5_HOME=/opt/red5/dist DAEMON=$RED5_HOME/$PROG.sh PIDFILE=/var/run/$PROG.pid # Source function library . /etc/rc.d/init.d/functions [ -r /etc/sysconfig/red5 ] && . /etc/sysconfig/red5 RETVAL=0 case "$1" in start) echo -n $"Starting $PROG: " cd $RED5_HOME $DAEMON >/dev/null 2>/dev/null & RETVAL=$? if [ $RETVAL -eq 0 ]; then echo $! > $PIDFILE touch /var/lock/subsys/$PROG fi [ $RETVAL -eq 0 ] && success $"$PROG startup" || failure $"$PROG startup" echo ;; stop) echo -n $"Shutting down $PROG: " killproc -p $PIDFILE RETVAL=$? echo [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$PROG ;; restart) $0 stop $0 start ;; status) status $PROG -p $PIDFILE RETVAL=$? ;; *) echo $"Usage: $0 {start|stop|restart|status}" RETVAL=1 esac exit $RETVAL [/code] What do I need to replace for Ubuntu in the above script. My Red5 is in /opt/red5/ and to start it manually I always do /opt/red5/dist/red5.sh from Ubuntu As I did not find rc.d/functions on Ubuntu on my laptop also /etc/init.d/functions I did not existed. I would like to be able to use them with service as Red hat distributions do. I checked /lib/lsb/init-functions.

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• Logging won't stop on log file after renaming/moving it.... how do I stop it?

  - by Jakobud

  Just discovered that logrotate is not rotating our firewall log. So its up to 12g in size. I need to split up the file into smaller chunks and start manually rotating them so I can get things back on track. However before I start splitting the firewall up, I need to stop the firewall from logging to the current firewall log file and force it to start logging to a new empty file. This way I'm not trying to split up or rotate a log file that is still constantly growing. I tried to simply do this: mv firewall firewall.old touch firewall I expected to see the new empty firewall file to start growing in size, but no... the firewall.old is still be logged to. Then I tried to start/stop iptables. No change. firewall.old is still the log file. I tried to move it to another directory. That didn't help. I tried to stop iptables, then change the filename and create a new firewall file and then start iptables again, but no change. How do I stop the logging on this file and force it to start logging on a new file?

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• Why would I need a firewall if my server is well configured?

  - by Aitch

  I admin a handful of cloud-based (VPS) servers for the company I work for. The servers are minimal ubuntu installs that run bits of LAMP stacks / inbound data collection (rsync). The data is large but not personal, financial or anything like that (ie not that interesting) Clearly on here people are forever asking about configuring firewalls and such like. I use a bunch of approaches to secure the servers, for example (but not restricted to) ssh on non standard ports; no password typing, only known ssh keys from known ips for login etc https, and restricted shells (rssh) generally only from known keys/ips servers are minimal, up to date and patched regularly use things like rkhunter, cfengine, lynis denyhosts etc for monitoring I have extensive experience of unix sys admin. I'm confident I know what I'm doing in my setups. I configure /etc files. I have never felt a compelling need to install stuff like firewalls: iptables etc. Put aside for a moment the issues of physical security of the VPS. Q? I can't decide whether I am being naive or the incremental protection a fw might offer is worth the effort of learning / installing and the additional complexity (packages, config files, possible support etc) on the servers. To date (touch wood) I've never had any problems with security but I am not complacent about it either.

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• vSphere - datastore falling off a host

  - by Chadddada

  Recently we have been running the vCheck powershell script daily in order to help in monitoring our vSphere ESX 4.0 environment. One of the oddities that we have been seeing is that some of the datastores on the SAN don't always show up on every host. Our hosts are connected redundantly, via FC, to some brocade FC switches, which then connect via fiber to our EMC Ax4 SAN. While all the datastores are presented to each host we have, and they see them initially, they sometimes seem to fall off and are no longer visible. It easy enough to rescan for datastores and add them back to the hosts the hosts but this seems to be an error. Has anyone else seen this or know why it may be happening? Responses to questions: 1. Is it always the same ESX servers that lose their connection? – Scott Warren No this happens randomly on random hosts. If a VM is running on a particular host, of which the VM's disks are on a SAN datastore, then that datastore won't disappear. It seems to happen if a host doesn't touch a datastore for a bit and it just forgets about it.

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• How do you initialize networking on a new Xen guest VM?

  - by Marten Veldthuis

  We have a Citrix XenServer setup, and while I personally lean more towards Dev than Ops, I've got an issue that's been bugging me. When you provision a new (Linux/Ubuntu) guest, how do you get it to have the correct IP-address? I'd want my application servers to exist in the range of 10.20.0.0/24, preferably being .1, .2, etc, so I can keep my sanity. I guess that the actual IP-address is something set in Linux itself, and Xen can't touch that, but then what's the best practice for getting it done? If you set up DHCP, don't you just move the problem to getting the adapters the "correct" MAC-addresses? Do you just have to hardcode a large table of MAC-addresses to IP-addresses, and then provision new guests always with the correct MAC-address on the virtual ethernet adapter? What we currently do is have an image of a "app server" that we boot up a new instance of, and then finalize it (with a script) that (among other things) modifies the /etc/networking/interface file to give it the correct IP. But that feels dirty to me, and I feel like surely there must a better way. Please enlighten me?

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• How can I avoid permission denied errors when attempting to deploy a rails app with capistrano?

  - by joshee

  Total noob here. I'm attempting to deploy an app through Capistrano. I'm getting relentless permission denied errors when I attempt to run cap deploy:update. Seemingly at least some of these errors are due to missing directories that trigger a "Permission Denied" error. (I'm doing setup on root just temporarily.) set :user, 'root' set :domain, 'domainname.com' set :application, 'appname' # adjust if you are using RVM, remove if you are not $:.unshift(File.expand_path('./lib', ENV['rvm_path'])) require "rvm/capistrano" set :rvm_ruby_string, '1.9.2' # file paths set :repository, "ssh://[email protected]/~/git/appname.git" set :deploy_to, "/var/rails/appname" # distribute your applications across servers (the instructions below put them # all on the same server, defined above as 'domain', adjust as necessary) role :app, domain role :web, domain role :db, domain, :primary => true set :deploy_via, :remote_cache set :scm, 'git' set :branch, 'master' set :scm_verbose, true set :use_sudo, false set :rails_env, :production namespace :deploy do desc "cause Passenger to initiate a restart" task :restart do run "touch #{current_path}/tmp/restart.txt" end desc "reload the database with seed data" task :seed do run "cd #{current_path}; rake db:seed RAILS_ENV=#{rails_env}" end end after "deploy:update_code", :bundle_install desc "install the necessary prerequisites" task :bundle_install, :roles => :app do run "cd #{release_path} && bundle install" end Here's my result: ** [domainname.com :: out] Cloning into '/var/rails/appname/shared/cached-copy'... ** [domainname.com :: err] Permission denied, please try again. ** [domainname.com :: err] Permission denied, please try again. ** [domainname.com :: err] Permission denied (publickey,gssapi-with-mic,password). ** [domainname.com :: err] fatal: The remote end hung up unexpectedly I'm able to ssh without a password, so not sure about that publickey error. By the way, if I run cap deploy:update without set :deploy_via, :remote_cache, here's my result: ** [domainname.com :: out] Cloning into '/var/rails/appname/releases/20120326204237'... ** [domainname.com :: err] Permission denied, please try again. ** [domainname.com :: err] Permission denied, please try again. ** [domainname.com :: err] Permission denied (publickey,gssapi-with-mic,password). ** [domainname.com :: err] fatal: The remote end hung up unexpectedly command finished Thanks a lot for your help with this.

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• Transcoding media server streaming to the iPhone

  - by pilif

  I have a huge collection of videos in different formats, but with one thing in common: They are not playable on an iPhone (or iPod Touch). Instead of complaining about Apple's IMHO broken world view ("there are no video formats but quicktime and mp4"), I wonder if there's a solution out there that allows streaming these different videos to the iPhone. This means that the source media needs to be transcoded on the fly. I already tried a few solutions out there, but with varying success: PS3 Media Server kind of worked, but only once and only for one single file. TVersity is said to work, but it requires UAC to be disabled and I don't see any need for this. The solution I'm looking for should run on Windows 2008 Server or Linux. I just can't believe that there's nothing out there that would allow me to stream my huge video collection on my iPhone (we're talking Wifi here, not 3G). After looking at the answers provided and after retrying TVersity without much success, I gave Orb another try and while the web interface failed to work for me, the iPhone Application (I tried the free one at first) actually worked flawlessly. And not only that, it also manages to convert the streams on-the-fly, so you don't have to wait for the transcoding process to finish before playback starts. On my 2.26 Ghz MacMini Server, this worked even with 1080p material. For Windows 2008 Server users out there: Remember to install the Desktop Experience Feature in the Server Manager if you intend this to work. Of all the stuff I had a look at, this really provided instant-success - even though I'm now probably sending the contents of my harddrive to orb's central server (sigh)

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• iTunes copy just metadata (song and album ratings, playlists) from iPod

  - by Jared Updike

  I have an iPod touch that I synched with my Windows computer (iTunes 9.0 I think) until my harddrive failed and I lost my entire library. I rebuilt the library (songs) from a year old backup (and various other source for songs) but my playlists and ratings are of course a year old. My iPod itself has most of the playlists and ratings I care most about (favorite songs and albums, rated 4 and 5, for example). I have a catch 22 situation where I feel nervous that I haven't backed up my iPod in around 4 months (when my drive failed) so I'd like to back it up as soon as possible... but if I back it up I have to clear all the songs and playlists and copy them back, which I can't really do since I need to rebuild my playlists on my computer first (using the data only available on my iPod!) The question: is there a better way to READ the information off my iPod than doing it manually, song by song and album by album and playlist by playlist (XML, text dump, database, spreadsheet, anything). In other words, mostly I want the information (metadata like ratings and playlists, not songs) copied off the iPod so I can more quickly get my iTunes library ratings and playlists re-built (manually) so I can finally wipe the music and back up my apps, etc. Then I'd like to copy the music back immediately. The part I'd like to avoid is manually navigating everything on my iPod to read through all the playlists and ratings (50 GB, 6,000+ songs) as I re-enter all of that data by hand. I've done a few dozen albums and it's pretty time consuming having to tap around on the iPod. Reading from a spreadsheet (for example, or XML which I could write a script to get into spreadsheet form) would probably help tremendously, plus then I'd have a backup of that information somewhere besides just my iPod.

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• creating a backup system with freenas

  - by masfenix

  We are currently in the process of opening a new accounting firm in the new year (actually moving from our previous location). I am looking for a cheap/free solution to back up our files (small, text files couple of kb). I was impressed with FreeNas and Windows Backup but I found out that Windows Backup only saves for a maximum of 2 years. The work machines will be running Windows 8 or Windows 7. There can be many work machines however we have only one to start with (ie, think of it as just one employee). I have an old core 2 duo with 2 gigs of ram that I can convert to a server if need be. I want the syncing to be done through LAN since the data is confidential and should never touch the outside world. So ideally, I would like the following scenario: A skydrive/dropbox like service to sync my client files over work machines and a central server. The "server" part should store history of files (i don't know how this will be done since the file will have the same name?). This isn't really necessary, but I can see it become useful. I am not familiar with RAID, so does any software RAID solution exist? I will most likely be buying 2 hard drives.

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• a brand new FS based on a database without using fuse

  - by Devrim

  hi all, To serve millions of files out of a single directory, being able to connect to a drive from hundreds of endpoints, and for some other reasons (to avoid gluster/nfs/all fs based networking solutions), I want to evaluate the possibility of making a filesystem that's based on a mongodb (or any other). Basically, it works like fusefs, every single file is kept in mongo gridfs. In theory, I do, mount mongodbfs /mountPoint mongodb://localhost then when i say touch /mountPoint/test.txt this file is inserted into mongodb. This FS will also store uid/gid and perms with the file, we can throw hundreds of servers to it, and no useradd will be necessary. I'm not thinking to include all the features of FS, just the ones we need. My question is, how do I start my quest in finding resources, books, links, people, developers who'd help me implement this? at least a proof of concept. Is it feasible? What should I expect as a timeline for such undertaking? Please only think about gazillion small files and folders.

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• All FireFTP passwords gone after auto-update

  - by GitaarLAB

  For the last six months (since the Firefox madness started and they keep on taking control of my PC) I'm terrified to touch Firefox. Problem is however, I've been using it in my business (since once upon a time it was a trustworthy application with useful extensions like FireFTP) and that installation (and plugins) holds four years of information. So Firefox continually deletes my important data (by) messing up (or blocking/or worse: auto-updating) my plug-ins, even crashing my computer as a result. Today Firefox killed FireFTP by (again) autoupdating FireFTP without my permission, and I did my best to disable that nonsense in about:config). Result: none of the (over 100) FireFTP accounts can be logged on to, they suddenly all ask for a password. I do not have the time to to find all of the passwords and reconfigure FireFTP again. How can I undo the mess Firefox created once again? That is, where are the passwords, how do I downgrade? As a side-question, how can I make Firefox behave again? I'm the boss of my computer, not them! How can I once and for-all take back control and completely kill every kind of auto-update feature?

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• Is It Possible To Self-Teach PHP, Wordpress, CentOS (Linux), Apache, Nginx etc?

  - by Aahan

  consider me a total noob, who uses a Windows PC and has never touched Linux. But I want to administer, manage and take responsibility of my server, at least at some point, if not now. But since I am a full-time blogger I am unable to find time to study at an institute. So, here is my question — - Is It Possible To Self-Teach HTML, CSS, PHP, JavaScript, Wordpress, CentOS (or for that matter any Linux distro), Apache, Nginx, and Varnish? Yes, beginning with HTML, absolutely all of them. I might seem overly ambitious and foolish, but I just want to do it. Aren't there any self-taught server admins? (1) Please help me out with the names of good books, links and whatever you can. (2) How long would it take me to get there (approximately)? 3 years? 5 years? (I have good touch with HTML & Wordpress.) This is a great community, I hope at least some of you will shoot some suggestions at me.

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• iTunes copy just metadata (song and album ratings, playlists) from iPod

  - by Jared Updike

  I have an iPod touch that I synched with my Windows computer (iTunes 9.0 I think) until my harddrive failed and I lost my entire library. I rebuilt the library (songs) from a year old backup (and various other source for songs) but my playlists and ratings are of course a year old. My iPod itself has most of the playlists and ratings I care most about (favorite songs and albums, rated 4 and 5, for example). I have a catch 22 situation where I feel nervous that I haven't backed up my iPod in around 4 months (when my drive failed) so I'd like to back it up as soon as possible... but if I back it up I have to clear all the songs and playlists and copy them back, which I can't really do since I need to rebuild my playlists on my computer first (using the data only available on my iPod!) The question: is there a better way to READ the information off my iPod than doing it manually, song by song and album by album and playlist by playlist (XML, text dump, database, spreadsheet, anything). In other words, mostly I want the information (metadata like ratings and playlists, not songs) copied off the iPod so I can more quickly get my iTunes library ratings and playlists re-built (manually) so I can finally wipe the music and back up my apps, etc. Then I'd like to copy the music back immediately. The part I'd like to avoid is manually navigating everything on my iPod to read through all the playlists and ratings (50 GB, 6,000+ songs) as I re-enter all of that data by hand. I've done a few dozen albums and it's pretty time consuming having to tap around on the iPod. Reading from a spreadsheet (for example, or XML which I could write a script to get into spreadsheet form) would probably help tremendously, plus then I'd have a backup of that information somewhere besides just my iPod.

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• How to go about rotating logs which are arbitrary named and placed in deeply nested directories?

  - by Roman Grazhdan

  I have a couple of hosts which are basically a playground for developers. On these hosts, each of them has a directory under /tmp where he is free to do all he wants - store files, write logs etc. Of course, the logs are to be rotated, or else the disc will be 100% full in a week. The files can be plenty, but I've dealt with it with paths like /tmp/[a-e]*/* and so on and lived happily for a while, but as they try new cool stuff on the machine logrotate rules grow ugly and unmanageable, and it's getting more difficult to understand which files hit the glob. Also, logrotate would segfault if asked to rotate a socket. I don't feel like trying to enforce some naming policies in that environment, I think it's going to take quite a lot of time and get people annoyed and still would fail at some point. And I still need to manage the logs, not just rm the dirs at night. So is it a good idea in circumstances like these to write a script which would handle these temporary files? I prefer sticking with standard utilities whenever possible, but here I think logrotate is getting less and less manageable. And probably someone heard of some logrotate alternatives which would work well in such an environment? I don't need emailing logs or some other advanced features, so theoretically some well commented find | xargs would do. P.S. I do have a log aggregator but this stuff is not going to touch my little cute logstash machine.

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• Step by step instructions to make dos "see" and "access" usb hard drives

  - by Gireesh Venkateswaran

  I am stuck with an USB external hard drive (Maxtor 1 Touch) 750GB that crashed. I have photos and home movies (my son's birth, first birthday etc) that are very important to me. I am given to understand that Spinrite is a very good tool to use, but It does not come "with out of the box" capabilities to access USB drives. If I open the case to get the HDD out from my External HDD, I would compromise the warrenty and I would not be able to exchange the Drive. I have done a bit of research and have the drivers that could help. But the bit I am missing is, How to put it all together. I would really appreciate it if some one can give me step by step instruction where I can create a dos boot cd that can load the drivers and assign a drive letter to it so that I can make Dos "See" the external hard drive. I have a Toshiba satellite laptop that runs Windows XP (Home). It does not have a floppy drive. I will be greatful to your help in the regard.

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• Is there any way to customize the Windows 7 taskbar auto-hide behavior? Delay activation? Timer?

  - by calbar

  I'm becoming increasingly frustrated with the way Windows 7 handles showing a hidden taskbar. It's incredibly over-eager to pop out and obscure what I'm really trying to interact with, requiring me to move the mouse away, wait for it to auto-hide again, then resume what I was doing but more deliberately. After closely examining the behavior, it appears that a hidden taskbar "peeks out" from the edge by 2 or 3 pixels, and slowly moving your mouse into this area activates it; you don't even need to touch the edge of the screen. I would love it if there was a way to customize or change this behavior. Ideally, the taskbar would only pop out if you are actively "pushing" the edge of the screen it is hidden on. So activation only occurs once you've reached the screens edge and continue to move the mouse past a customizable threshold. Alternatively, a simple activation delay would suffice as well. So only if the mouse remains in that 2-3 pixel area (a.k.a. on the taskbar) for greater than a customizable amount of time does it pop out again. This would only be a fraction of a second. Often times the cursor simply "careens" off the edge of the screen while trying to focus on something nearby. Anyway, if there are any registry settings or utilities that can achieve either of these effects, that would be great! Thanks for your help.

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• How to fix GMail time stamps in Outlook?

  - by SWB

  One of my email accounts is hosted at an ISP with unreliable IMAP support, and I can't change it. Fortunately, I have my personal email set up on Google Apps for Domains, so I created another GMail account there and turned on GMail's features that allow me to send and receive mail through the ISP account using GMail ("Send mail as" and "Get mail from other accounts" in GMail settings on the Accounts tab). I'm now using Outlook to retreive mail from the GMail account through IMAP, which in turn is retreiving mail from the ISP account through POP3. This basically works great, except for one very significant issue: Prior to setting this up, I already had several months of mail in the ISP account that I had been accessing via IMAP. GMail grabbed all of this mail via POP3 at, let's say, noon on April 5. In GMail's web interface (and on my iPod touch, and in Mozilla Thunderbird), all is well: the messages are all shown with their original time stamps. But when Outlook downloads these messages from GMail via IMAP, the time stamps are all set to noon on April 5 (the time GMail downloaded them from the ISP via POP3). That's not good, especially since we're talking about hundreds of messages here over a time span of several months. How can I fix this and get Outlook to display the original time stamps?

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• Anyone have real world experience with Rackspace Cloud Sites at high scale?

  - by Allara

  I have a pure web service application layer using .NET. I was originally planning to use Amazon EC2, but rolling my own autoscaling procedures is a bit intimidating, and the scaling isn't very granular from a cost perspective. If the app is successful, we could be looking at relatively high scale (millions of requests per month). The app uses Amazon SimpleDB as the database layer. As a test, I have the app running successfully in Rackspace Cloud Sites. Performance seems to be equal to (if not better than) a standard EC2 instance, even with the added latency of the SimpleDB requests travelling to the Rackspace network. However, testing at this stage is at a very low scale. My question is this: has anyone had real-world experience running a high scale application on Rackspace Cloud Sites? Moreover, once you pass the "included" 10,000 compute cycles per month, does the overall cost seem to be lower than rolling lots of EC2 instances? My assumption would be that with completely smooth scaling (i.e. only adding compute resources as needed), the cost could be lower on average. However, their stated goal of calibrating 10,000 CCs as a single 1.2 Ghz CPU seems on average to be much more expensive than EC2. I like the idea of no-touch scaling, but is it too good to be true?

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• VMWare Server modifying files related to paused VMs, is this expected?

  - by David Spillett

  While refreshing the backup of a VM used for testing, I experienced the following warning from tar: tar: /VMsR0/cli_noddyco_test/VM2K8_32_web.vmem: file changed as we read it The VMs in question were paused at the time. My first though was that I'd mixed up the machines and was trying to backup something that was still actively running. To be sure I unpaused and properly shut down the VM, and the vmem files that tar reported changing vanished as I would expect. Is it normal for VMWare Server to touch or alter files for paused VMs like this, or is there likely something amiss with our setup? If this is expected behaviour, is just touching the vmem file (and so altering the last modification date without actually changing content)? If it is normal for files relating to paused VMs to be updated I shall have to revise our backup procedures to make sure the VMs are fully shut down fully rather than just pausing them (this isn't a problem, but it seems strange and I'd prefer to understand what VMWare is doing and why instead of just dismissing it as "one of those things" and working around it). For further detail: the host in question is VMWare Server version 2.0.2 running on 64-bit Debian/Lenny, and that VM did not have a snapshots at the time. We have backed up paused VMs this way in the past with no such warnings from tar.

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• Can applications use all of the memory in Windows 8?

  - by Barleyman

  Windows 7 (and Windows Vista) have a built-in limit of not being able to use the last 25% of RAM. You will get a low memory warning when you get close to the limit. Even if you disable that warning, applications will run out of memory and crash since the OS will refuse to allocate memory from that last 25%. That was fine when Vista was designed, when machines had 1 GB of total memory, but is pretty daft for today's 8 GB machines. Yes, the system will run cache, etc. on that extra 2 GB, but running out of memory when you have "merely" 2 GB left.... NB: this has nothing to do with the page file. If you limit the page file to a sensible size like 2 GB, you will still see this behavior. The system will cram the page file to the last byte while refusing to touch that 1/4th of the RAM. Does Windows 8 change this behavior? Is there now some fixed minimum free RAM requirement, like 512 MB, or is it still 25%? Can you actually adjust the low memory limit?

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• Mac OS X - Time Machine backup fails verification - What can I do to save the history?

  - by usermac75

  Hi, How do I make Time Machine to make a new complete backup without losing older versions of backed up files? Verbose: I am using the Time Machine backup on my OS X (Snow Leopard) to backup the whole computer to an external drive. I especially like the "history", i.e. the feature that allows you to restore the older version of a file. Problem: I had some data corruption on my external backup drive, I repaired it with the System Tool for doing that, it found some faults. I had the disk tool repair the external drive. After that, the external drive was OK and I could use Time Machine again. I let Time Machine do one more backup. Now I made a verification according to http://superuser.com/questions/47628/verifying-time-machine-backups, namely along sudo diff -qr . $HOME/Desktop 2>&1 | tee $HOME/timemachine-diff.log However: After doing the command above, several differences and missing files were reported, approx. 200 files in sum. Whereas some of the missing files were cache or excluded directories, the differences do bother me, especially as some important documents from me are listed as differing. How can I make sure that the data on the external drive is synced correctly? Is it possible to have Time Machine to do a complete new backup without losing the history? Or to have Time Machine compare all files for differences and re-write all files that are different? Or can I set some flags on the files that do not match to have them copied again? (like the archive-flag in Windows/Dos). I'd rather not touch the files because I would like to keep the date of last change/date of creation) Thank you for your thoughts!

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• Physical Debian to VMWare: vmware-converter, dd-image or otherwise?

  - by Dabu

  we have two debian Lenny production machines, both running larger commercial websites. Now these machines need to be moved, and in the process, they need to be virtualized to VMWare ESX. If you believe the internet information, there are several ways to accomplish this. The easiest for us would be to use our weekly dd backup where the whole disk, however, I have no experience with this kind of technology and if it is really possible. The second best way would be via an application on the source machine virtualizing it and generating an ESX compatible VM. However, the software is beta and unsupported, and after installation, nothing really works (the /etc/init.d/vmware-converter script doesn't actually do anything, start and stop reply with success messages, yet ps shows that there are no new processes). The worst way with the most work would be to install a new machine and set it up manually, copying files and databases as needed. This part is clear in it's execution, and my question(s) do not touch this. Is my 1st way possible? Has anyone done this yet, or better, has a page with instructions? Or is there a help page that explains how to correctly install, run and use the vmware-converter tool using a Debian installation (it's possible that I dod something wrong during installation already)? Thank you.

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