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  • Mac OS X - User home directories shared via NFS

    - by Hugh
    I've run into some problems with how I've got user home directories set up on our system here. Our server is an XServe, using Open Directory to manage the user accounts. The majority of our workstations are OS X, but there are a few running Linux (Centos 5.3), and, as time goes on, we expect the proportion of Linux workstations to increase (at some point, we expect to move the server side over to Linux too, but for now we're running with what we've already got) To ensure that the Linux and OS X workstations both see user's home directories in the same place, I shared the home directories using NFS. On the server end, the home directories are stored in: /Volumes/data/company_users This is mounted on the workstations to: /mount/company_users This work fine on the Linux workstations, but there is some weirdness under OS X. For the user who is logged in through the GUI, it all works just fine. However, if a user tries to SSH into a machine that they are not the primary user on, they often have no access to their own home directory. It looks as though OS X is trying to do something else to the user home directories mount point when you log in through the GUI.... For example, on this machine (nv001), I (hugh) am logged into the GUI. Last login: Mon Mar 8 18:17:52 on ttys011 [nv001:~] hugh% ls -al /mount/company_users total 40 drwxrwxrwx 26 hugh wheel 840 27 Jan 19:09 . drwxr-xr-x 6 admin admin 204 19 Dec 18:36 .. drwx------+ 128 hugh staff 4308 27 Feb 23:36 hugh drwx------+ 26 matt staff 840 4 Dec 14:14 matt [nv001:~] hugh% So Matt's home directory is accessible to him. However, if I try to switch to him: [nv001:~] hugh% su - matt Password: su: no directory [nv001:~] hugh% Or: [nv001:~] hugh% su matt Password: tcsh: Permission denied tcsh: Trying to start from "/mount/company_users/matt" tcsh: Trying to start from "/" [nv001:/] matt% Does anyone have any idea why it might be doing this? It's causing me all sorts of problems at the moment... The only machine that I can successfully switch users at the moment is the server that the user directories are stored on, where /mount/company_users is actually just a symlink to /Volumes/data/company_users

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  • How can I calculate power consumption of my PC in Watt?

    - by Jitendra vyas
    How can I calculate power consumption of my PC in Watt, to prove my House owner ( I live on rent) , my PC doesn't consume much power? He blames me for Huge power bills even he too use Fridge, A.C. etc and his son watch the TV all the time. We both share one Power meter so for bill we pay 50%-50% but He is saying I use PC all the time even night i keep on for downloading. I just want to calculate power consumption of my PC then will calculate monthly expense of unit as per my City's per unit price for power. I've Windows: Microsoft Windows XP Professional 5.1.2600 Service Pack 3 Memory (RAM): 960 MB CPU Info: AMD Sempron(tm) Processor 2500+ CPU Speed: 1399.0 MHz Sound card: Vinyl AC'97 Audio (WAVE) Display Adapters: VIA/S3G UniChrome Pro IGP | NetMeeting driver | RDPDD Chained DD Monitors: 1 - 17inch LCD - LG Screen Resolution: 1280 X 768 - 32 bit Network: Network Present Network Adapters: Bluetooth Device (Personal Area Network) #2 | WAN (PPP/SLIP) Interface CD / DVD Drives: I: ELBY CLONEDRIVE COM Ports: COM1 | COM2 | COM7 | COM8 | COM9 | COM10 LPT Ports: LPT1 Mouse: 3 Button Wheel Mouse Present Hard Disks: C: 29.3GB | D: 29.3GB | E: 97.7GB | F: 97.7GB | G: 211.9GB USB Controllers: 5 host controllers. Firewire (1394): 1 host controllers. Manufacturer: Phoenix Technologies, LTD Product Make: MS-7142 AC Power Status: OnLine BIOS Info: AT/AT COMPATIBLE | 01/18/06 | VIAK8M - 42302e31 Motherboard: MICRO-STAR INTERNATIONAL CO., LTD MS-7142 Modem: ZTE USB Modem FFFE CDMA #2

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  • VMWare Fusion: "No Permission to access this virtual machine"

    - by Craig Walker
    I had a VMWare Fusion VM backed up on my home network file server (Ubuntu). I wanted to run it again, so I copied it back to my Macbook. When I tried to launch it in VMWare, I got an error message: No permission to access this virtual machine. Configuration file: /Users/craig/WinXP Clean + Scanner.vmwarevm/WinXP Pro Test.vmx The permissions look fine to me: The bundle directory is 777 The bundle files (including the listed .vmx) are all 666 User is craig (my current user); group is staff. I changed the group to wheel at the suggestion of this page, but that didn't help. Finder shows read & write for craig, staff, and everyone on the bundle directory The bundle dir is also not locked Finder also shows rw and unlocked for the .vmx file The parent directory is also rw & unlocked Disk Utility permissions check doesn't show any problems with any of the associated files It sure looks like I should have wide open access to run this VM; why is Fusion complaining?

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  • Recommended programming language for linux server management and web ui integration

    - by Brendan Martens
    I am interested in making an in house web ui to ease some of the management tasks I face with administrating many servers; think Canonical's Landscape. This means doing things like, applying package updates simultaneously across servers, perhaps installing a custom .deb (I use ubuntu/debian.) Reviewing server logs, executing custom scripts, viewing status information for all my servers. I hope to be able to reuse existing command line tools instead of rewriting the exact same operations in a different language myself. I really want to develop something that allows me to continue managing on the ssh level but offers the power of a web interface for easily applying the same infrastructure wide changes. They should not be mutually exclusive. What are some recommended programming languages to use for doing this kind of development and tying it into a web ui? Why do you recommend the language(s) you do? I am not an experienced programmer, but view this as an opportunity to scratch some of my own itches as well as become a better programmer. I do not care specifically if one language is harder than another, but am more interested in picking the best tools for the job from the beginning. Feel free to recommend any existing projects that already integrate management of many systems into a single cohesive web ui, except Landscape (not free,) Ebox (ebox control center not free) and webmin (I don't like it, feels clunky and does not integrate well with the "debian way" of maintaining a server, imo. Also, only manages one system.) Thanks for any ideas! Update: I am not looking to reinvent the wheel of systems management, I just want to "glue" many preexisting and excellent tools together where possible and appropriate; this is why I wonder about what languages can interact well with pre-existing command line tools, while making them manageable with a web ui.

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  • Weird permission issue with POSIX ACLs, NFS v3 on Linux

    - by jon
    I have two Linux systems, both running Debian Squeeze. Versions of (I think) the stuff involved are: kernel: 2.6.32-5-xen-amd64 ii nfs-kernel-server 1:1.2.2-4squeeze2 support for NFS kernel server ii libnfsidmap2 0.23-2 An nfs idmapping library ii nfs-common 1:1.2.2-4squeeze2 NFS support files common to client and server ii portmap 6.0.0-2 RPC port mapper (The client doesn't have nfs-kernel-server involved.) I have a directory with ACLs: # file: dirname # owner: jon # group: foogroup # flags: -s- user::rwx user:www-data:rwx group::r-x group:foogroup:rwx mask::rwx other::r-x default:... There are two users, neither one of which owns the directory: uid=3001(jake) gid=3001(jake) groups=3001(jake),104(wheel),3999(foogroup) uid=3005(nic) gid=3005(nic) groups=3005(nic),3999(foogroup) The jake user can create files in the directory without issues. The nic user can't. All UIDs/GIDs are the same on the client and server. I've verified (packet sniffing) that the right uids/gids get sent via AUTH_UNIX are correct-- uid=gid=3005, auxiliary gids=3005,3999-- and that the server replies with NFS3ERR_ACCESS, which the kernel on the client maps to EACCES (Permission denied). Can anyone help me here?

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  • Linux/Unix MTA with the smartest queue?

    - by threecheeseopera
    I am looking for an MTA that will allow me (a script, really) to proactively manage it's send queue in response to status codes returned by the remote servers I am delivering to. Basically, for each mail sent I would like to be able to react to the SMTP reply code returned by the remote server, ex. '250 OK', or to any error conditions like connection timeouts. Additionally, I would like to be able to manage the send queue moving forward based on this information, e.g. 'example.com has timed out the last 5 connection attempts, so no longer queue mail for recipients @example.com'. I am currently using postfix and perl to parse it's logs for this information, but I am playing a game of catchup that is prone to errors (out-of-order log entries etc.) and it's starting to get messy (some real ugly regexes ;). I really don't want to reinvent the wheel and use some language's smtp library; i would prefer to use a proven/fast/reliable MTA. I am however open to suggestions if what I need just isn't possible. Thanks for your help!

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  • IE9 will not navigate to some websites but Google Chrome can

    - by Storchburp
    Was recommended by a friend to ask for help here. I am using Internet Explorer 9. As of two days ago I was suddenly unable to navigate to any part of the following websites: www.computerandvideogames.com www.deviantart.com www.cnet.com However I can still access all of them normally through Google Chrome. I am on a college network but these sites are also accessible through fixed terminals provided by the school and are definitely not blocked. I do not know of any other sites similarly affected. There is no popup, no error message, no diversion to a site telling me I can't access / am blocked etc. I can be on www.google.com and attempt to access these sites through the URL or google search, and my cursor will just show the little moving blue wheel next to the arrow for a couple of seconds, and the page displayed on my browser will not change; ie. not navigating at all. Running antivirus software, changing proxy settings in IE, clearing cookies, unplugging/plugging in computer, restarting PC etc have not changed the situation. Any assistance or advice would be greatly appreciated. Thanks in advance.

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  • Simple end-to-end load and bottleneck monitoring for DB-based web sites

    - by T.J. Crowder
    What tools do you use / would you recommend for monitoring a Linux-based, DB-based website's servers for bottlenecks and load? The obvious goal being to know when growth has gotten to the point where it's necessary to scale up (or out) one or more of the bits and pieces because the current system won't be managing the load if an observed trend continues. I'm looking for general recommendations based on standard Linux load metrics, disk I/O metrics, network I/O metrics, etc., but if specifics are helpful: It'll be Tomcat6 using APR (possibly with a Varnish or similar caching and balancing front-end), MySQL, and either Ubuntu 8.04 LTS or 10.04 LTS depending on timing. I know about top, vmstat, iostat, bwmon and the like that collect and parse info from the /proc file system (et. al.); and obviously MySQL provides a lot of queriable performance information. I could use those directly, probably automating periodic monitoring logs with scripts and such. But I have a suspicion that I'd be reinventing a wheel... For example, Hyperic HQ seems to be along the lines of what I'm looking for. Others? Meta: I tend to think of "recommendation" questions as needing to be CW because there's no one right answer, but I see a lot of these here that aren't CWs, so I haven't marked it as one. I'll happily do so if enough people think I should.

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  • How can I have puppet deploy ssh keys for virtual users?

    - by Pheezy
    I am trying to get puppet to assign authorized ssh keys for virtual users but I keep getting the following error: err: Could not retrieve catalog: Could not parse for environment production: Syntax error at 'user'; expected '}' at /etc/puppet/modules/users/manifests/ssh_authorized_keys.pp:9 I believe my configuration are correct (listed below) but is there a syntax error or scoping issue I am missing? I would simply like to assign users to nodes and have those users automagically have their ssh keys installed. Is there maybe a better way to do this and I'm just overthinking it? # /etc/puppet/modules/users/virtual.pp class user::virtual { @user { "user": home => "/home/user", ensure => "present", groups => ["root","wheel"], uid => "8001", password => "SCRAMBLED", comment => "User", shell => "/bin/bash", managehome => "true", } # /etc/puppet/modules/users/manifests/ssh_authorized_keys.pp ssh_authorized_key { "user": ensure => "present", type => "ssh-dss", key => "AAAAB....", user => "user", } # /etc/puppet/modules/users/init.pp import "users.pp" import "ssh_authorized_keys.pp" class user::ops inherits user::virtual { realize( User["user"], ) } # /etc/puppet/manifests/modules.pp import "sudo" import "users" # /etc/puppet/manifests/nodes.pp node basenode { include sudo } node 'testbox' inherits basenode { include user::ops } # /etc/puppet/manifests/site.pp import "modules" import "nodes" # The filebucket option allows for file backups to the server filebucket { main: server => 'puppet' } # Set global defaults - including backing up all files to the main filebucket and adds a global path File { backup => main } Exec { path => "/usr/bin:/usr/sbin/:/bin:/sbin" }

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  • Rsync: Only preserve meta (time, group, etc) on files and sub-directories, not root directory

    - by Svish
    I am copying some files (all except hidden ones) using rsync from one place to another using this command: rsync -Cav --delete --exclude=.* /Some/Directory/ other-host:/Other/Directory It works nice except that I get the following errors: rsync: chgrp "/Other/Directory/." failed: Operation not permitted (1) rsync: failed to set times on "/Other/Directory/.": Permission denied (13) That is understandable because I do in fact not have those permissions, and I also do not want to change the group of that directory. I only want to do this for all the files and directories that are in that directory. Is there any way to solve this? Tried to --exclude=. and --exclude=./, but those didn't work. Any ideas? I have no idea how to fix this... More details: This is on Mac OS X, and the directories I am syncing is from a local mounted volume to the /Users/Shared/ directory on the other host. That directory has user root and group wheel. The files inside it has user admin and group staff and so does the local source directory.

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  • Selective Pointer device remapping in linux

    - by user6368
    I just got an HP 2710p (hp tablet, with digitizer), and I've played around with linux for a while now, and thought I would go ahead and install it. Everything works fine, excepting normal tablet functions, which is to be expected. I'm working on the screen rotation, and there are on-screen keyboards, etc, but I'm having issues with the stylus. I can tap and left click with the stylus as normal, but the side button (which in windows functions as a right mouse button) appears as a 'button 2' to xev (a middle/scroll wheel button). I can switch 'button 2' and 'button 3' universally using xmodmap, but I'd like to do so exclusively for stylus so I don't screw up regular pointing devices. Altering xorg.conf (which is surprisingly bare) with the recommended sections (adding sections for each of the stylus buttons) does nothing. I'm running crunchbang, which is an ubuntu/debian varient with openbox as the windows manager. Thanks Also, as a seperate note, does anybody know how to detect when I rotate and/or latch the lid shut? I was thinking maybe I could run a script to switch the buttons when I close it, but I can't find any information.

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  • Group Policy Software Installs Too Silent on Windows 7

    - by jonblock
    I'm trying to migrate a Windows XP deployment process to Windows 7. The process has been surprisingly smooth, after figuring out how to bring up a base system. We rely heavily on Group Policy software installation, which in XP can mean long periods on any given morning sitting around watching the machine install new updates. At least the typical Windows Installer message shows the user that something is indeed happening. As far as I can tell, Windows 7 retains the startup installation process (good), but eliminates the on-screen message to indicate what's happening (bad). All a user will see, possibly for a half-hour or more if they haven't restarted for a while, is the electric hamster wheel and the words "Please wait...". I forsee a significant increase in support calls... If you're familiar with msiexec.exe parameters, XP behaves like /qb-, and 7 behaves like /qn. I want the /qb- behavior back. Is there a way to re-enable the Windows Installer notices for Group Policy startup installations?

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  • Durability of Websockets Server

    - by smitchell360
    I am starting to experiment with websockets. Does anyone know of a websockets server (open source or paid) that provides a durable store of the websocket "channel"? All of the examples that I have found do not address durability -- if a websockets server goes down, all "channel" data is lost. Services such as Pusher do not really discuss whether they address the durability issue (and I have not received a response from tech support yet). Happy to roll my own, but would rather not reinvent the wheel. EDIT: I'm not looking for websockets 101 information. That is readily available and understood. I'm looking for a server (open source or paid) that supports websockets and has a durable store for the websocket data so that, in the event that a server fails, a new server can take over where the original one left off. Two main purposes: 1. support failover scenarios contemplated by the websockets Network Working Group http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.1 (most importantly so that missed messages are sent when a client connects to a failover server) 2. support scenarios where new subscribers must receive all past messages that were published. Of course this can be handled at the application layer...but that is not what I am looking for.

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  • scrolling lags in emacs 23.2 with GTK

    - by mefiX
    Hey there, I am using emacs 23.2 with the GTK toolkit. I built emacs from source using the following configure-params: ./configure --prefix=/usr --without-makeinfo --without-sound Which builds emacs with the following configuration: Where should the build process find the source code? /home/****/incoming/emacs-23.2 What operating system and machine description files should Emacs use? `s/gnu-linux.h' and `m/intel386.h' What compiler should emacs be built with? gcc -g -O2 -Wdeclaration-after-statement -Wno-pointer-sign Should Emacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should Emacs use a relocating allocator for buffers? yes Should Emacs use mmap(2) for buffer allocation? no What window system should Emacs use? x11 What toolkit should Emacs use? GTK Where do we find X Windows header files? Standard dirs Where do we find X Windows libraries? Standard dirs Does Emacs use -lXaw3d? no Does Emacs use -lXpm? yes Does Emacs use -ljpeg? yes Does Emacs use -ltiff? yes Does Emacs use a gif library? yes -lgif Does Emacs use -lpng? yes Does Emacs use -lrsvg-2? no Does Emacs use -lgpm? yes Does Emacs use -ldbus? yes Does Emacs use -lgconf? no Does Emacs use -lfreetype? yes Does Emacs use -lm17n-flt? no Does Emacs use -lotf? yes Does Emacs use -lxft? yes Does Emacs use toolkit scroll bars? yes When I'm scrolling within files of a common size (about 1000 lines) holding the up/down-keys, emacs almost hangs and produces about 50% CPU-load. I use the following plugins: ido linum tabbar auto-complete-config Starting emacs with -q fixes the problem, but then I don't have any plugins. I can't figure out, which part of my .emacs is responsible for this behaviour. Here's an excerpt of my .emacs-file: (require 'ido) (ido-mode 1) (require 'linum) (global-linum-mode 1) (require 'tabbar) (tabbar-mode 1) (tabbar-local-mode 0) (tabbar-mwheel-mode 0) (setq tabbar-buffer-groups-function (lambda () (list "All"))) (global-set-key [M-left] 'tabbar-backward) (global-set-key [M-right] 'tabbar-forward) ;; hide the toolbar (gtk etc.) (tool-bar-mode -1) ;; Mouse scrolling enhancements (setq mouse-wheel-progressive-speed nil) (setq mouse-wheel-scroll-amount '(5 ((shift) . 5) ((control) . nil))) ;; Smart-HOME (defun smart-beginning-of-line () "Forces the cursor to jump to the first none whitespace char of the current line when pressing HOME" (interactive) (let ((oldpos (point))) (back-to-indentation) (and (= oldpos (point)) (beginning-of-line)))) (put 'smart-beginning-of-line 'CUA 'move) (global-set-key [home] 'smart-beginning-of-line) (custom-set-variables ;; custom-set-variables was added by Custom. ;; If you edit it by hand, you could mess it up, so be careful. ;; Your init file should contain only one such instance. ;; If there is more than one, they won't work right. '(column-number-mode t) '(cua-mode t nil (cua-base)) '(custom-buffer-indent 4) '(delete-selection-mode nil) '(display-time-24hr-format t) '(display-time-day-and-date 1) '(display-time-mode t) '(global-font-lock-mode t nil (font-lock)) '(inhibit-startup-buffer-menu t) '(inhibit-startup-screen t) '(pc-select-meta-moves-sexps t) '(pc-select-selection-keys-only t) '(pc-selection-mode t nil (pc-select)) '(scroll-bar-mode (quote right)) '(show-paren-mode t) '(standard-indent 4) '(uniquify-buffer-name-style (quote forward) nil (uniquify))) (setq-default tab-width 4) (setq-default indent-tabs-mode t) (setq c-basic-offset 4) ;; Highlighting of the current line (global-hl-line-mode 1) (set-face-background 'hl-line "#E8F2FE") (defalias 'yes-or-no-p 'y-or-n-p) (display-time) (set-language-environment "Latin-1") ;; Change cursor color according to mode (setq djcb-read-only-color "gray") ;; valid values are t, nil, box, hollow, bar, (bar . WIDTH), hbar, ;; (hbar. HEIGHT); see the docs for set-cursor-type (setq djcb-read-only-cursor-type 'hbar) (setq djcb-overwrite-color "red") (setq djcb-overwrite-cursor-type 'box) (setq djcb-normal-color "black") (setq djcb-normal-cursor-type 'bar) (defun djcb-set-cursor-according-to-mode () "change cursor color and type according to some minor modes." (cond (buffer-read-only (set-cursor-color djcb-read-only-color) (setq cursor-type djcb-read-only-cursor-type)) (overwrite-mode (set-cursor-color djcb-overwrite-color) (setq cursor-type djcb-overwrite-cursor-type)) (t (set-cursor-color djcb-normal-color) (setq cursor-type djcb-normal-cursor-type)))) (add-hook 'post-command-hook 'djcb-set-cursor-according-to-mode) (define-key global-map '[C-right] 'forward-sexp) (define-key global-map '[C-left] 'backward-sexp) (define-key global-map '[s-left] 'windmove-left) (define-key global-map '[s-right] 'windmove-right) (define-key global-map '[s-up] 'windmove-up) (define-key global-map '[s-down] 'windmove-down) (define-key global-map '[S-down-mouse-1] 'mouse-stay-and-copy) (define-key global-map '[C-M-S-down-mouse-1] 'mouse-stay-and-swap) (define-key global-map '[S-mouse-2] 'mouse-yank-and-kill) (define-key global-map '[C-S-down-mouse-1] 'mouse-stay-and-kill) (define-key global-map "\C-a" 'mark-whole-buffer) (custom-set-faces ;; custom-set-faces was added by Custom. ;; If you edit it by hand, you could mess it up, so be careful. ;; Your init file should contain only one such instance. ;; If there is more than one, they won't work right. '(default ((t (:inherit nil :stipple nil :background "#f7f9fa" :foreground "#191919" :inverse-video nil :box nil :strike-through nil :overline nil :underline nil :slant normal :weight normal :height 98 :width normal :foundry "unknown" :family "DejaVu Sans Mono")))) '(font-lock-builtin-face ((((class color) (min-colors 88) (background light)) (:foreground "#642880" :weight bold)))) '(font-lock-comment-face ((((class color) (min-colors 88) (background light)) (:foreground "#3f7f5f")))) '(font-lock-constant-face ((((class color) (min-colors 88) (background light)) (:weight bold)))) '(font-lock-doc-face ((t (:inherit font-lock-string-face :foreground "#3f7f5f")))) '(font-lock-function-name-face ((((class color) (min-colors 88) (background light)) (:foreground "Black" :weight bold)))) '(font-lock-keyword-face ((((class color) (min-colors 88) (background light)) (:foreground "#7f0055" :weight bold)))) '(font-lock-preprocessor-face ((t (:inherit font-lock-builtin-face :foreground "#7f0055" :weight bold)))) '(font-lock-string-face ((((class color) (min-colors 88) (background light)) (:foreground "#0000c0")))) '(font-lock-type-face ((((class color) (min-colors 88) (background light)) (:foreground "#7f0055" :weight bold)))) '(font-lock-variable-name-face ((((class color) (min-colors 88) (background light)) (:foreground "Black")))) '(minibuffer-prompt ((t (:foreground "medium blue")))) '(mode-line ((t (:background "#222222" :foreground "White")))) '(tabbar-button ((t (:inherit tabbar-default :foreground "dark red")))) '(tabbar-button-highlight ((t (:inherit tabbar-default :background "white" :box (:line-width 2 :color "white"))))) '(tabbar-default ((t (:background "gray90" :foreground "gray50" :box (:line-width 3 :color "gray90") :height 100)))) '(tabbar-highlight ((t (:underline t)))) '(tabbar-selected ((t (:inherit tabbar-default :foreground "blue" :weight bold)))) '(tabbar-separator ((t nil))) '(tabbar-unselected ((t (:inherit tabbar-default))))) Any suggestions? Kind regards, mefiX

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  • Is there the equivalent of cloud computing for modems?

    - by morpheous
    I asked this question on SF, and someone recommended that I ask it here - (I don't think I have enough points to move a question from SF to SO - and in any case, I don't know how to do it - so here is the question again): I am interested in the concept of PAAS (platform as a service). However, all talk about SAAS/PAAS seems to focus on only the computer itself - not its peripherals. Is it possible to 'outsource' modems as a resource - so that an app running remotely can pump data to a modem in the cloud? As a bit of background to the question, a group of us are thinking of starting a company that offers similar services to companies like twilio etc - but I want to 'outsource' both the computing hardware (thats PAAS - the easy bit) and the modems (thats what I cant seem to find any info on). Does anyone know if modems can be bundled as part of a PAAS service? - alternatively, is there a way that an application running on one computer can communicate (i.e. pump data) to a remote modem residing on another machine?. I assume I can come up with some protocol over UDP or TCP - but there is no point reinventing the wheel - if such a protocol like that already exists (or if it some open source software allows one to do this). Any suggestions on how to solve this problem?

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  • Websockets Server with Fault-Tolerance and Durable Message Store

    - by smitchell360
    I am starting to experiment with websockets. Does anyone know of a websockets server (open source or paid) that provides a durable store of the websocket "channel"? All of the examples that I have found do not address durability -- if a websockets server goes down, all "channel" data is lost. Services such as Pusher do not really discuss whether they address the durability issue (and I have not received a response from tech support yet). Happy to roll my own, but would rather not reinvent the wheel. EDIT: I'm not looking for websockets 101 information. That is readily available and understood. I'm looking for a server (open source or paid) that supports websockets and has a durable store for the websocket data so that, in the event that a server fails, a new server can take over where the original one left off. Two main purposes: 1. support failover scenarios contemplated by the websockets Network Working Group http://tools.ietf.org/html/draft-ibc-websocket-dns-srv-02#section-5.1 (most importantly so that missed messages are sent when a client connects to a failover server) 2. support scenarios where new subscribers must receive all past messages that were published. Of course this can be handled at the application layer...but that is not what I am looking for. EDIT So, after some research the following installed options seem to be the most robust: Kaazing Migratory Migratory (http://migratory.ro) Hosted services that seem "real" Pusher (great API but no history feature yet) PubNub (has history) All of the above services have graceful fallback to other communication methods if websockets are not available. I was not able to find any open source that provided "out of the box" clustering, fail-over, and a durable message store to play back history. There are some projects that may serve as good starting points, but not exactly what I am looking for.

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  • Can't open cocoa emacs from terminal using open -a

    - by Shane
    I installed emacs on my MacBook Air running Mac OS X 10.6.5 from this site http://emacsformacosx.com/. I believe this is what used to be called cocoa emacs. I dragged it into my Application folder and it works fine when I run it from there. I want to be able to run it from the Terminal. After some googling, I tried open -a /Application/Emacs.app foo.txt (foo.txt was and existing file). I got two emacs windows - one with welcome screen and one with foo.txt loaded. I tried a few applications in the /Applications directory and they did not seem to behave like this. I had installed it using my own account (an admin account) so after doing ls -l on /Application I noticed that the owner and group were different from the other entries in this folder. I recursively changed the owner and group to root and wheel, like the others, but this did not help. The only thing that looks funny now is that there that ls -l show a @ character which has something to do with extended attributes but I don't know how to check these. Any suggestions on what to check next? Is using the open command the only to run the program? Can I simulate what it does using a shell script?

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  • Synaptics touchpad stops working randomly

    - by Jus12
    I have two laptops. One dell Vostro and other Vaio Z. Both have Synaptics (Yes, I have checked, and the original drivers were from Synaptics as well). On both laptops, the touchpad scrolling stops working at some arbitrary time and nothing seems to solve it except a reboot. Sometimes, it randomly starts working again. I have downloaded all latest drivers from OEM. Interestingly, when I run a program as Administrator, scrolling works in that window only. This problem is very odd. It happens without any reason and I've not been able to find a fix for more than a year. I have seen some unusual suggestions on forums (e.g., to "restore windows to a previous working state") but never any fix that solves this issue properly. I have tried installing latest drivers and I DO NOT want to restore windows to a previous working configuration. OS: Windows 7 64 bit Professional (Sony Vaio Z - VPCZ128GG) Windows 7 32 bit Professional (Dell) Edit: Temporary solution is to uninstall the synaptics driver and let Windows 7 use its default built in one. However, I really prefer the Synaptic driver because it activates the scroll button rather than the mouse wheel (useful in some apps such as MS Photo Editor)

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  • Building a Web proxy to get around same-origin restrictions for collaborative Webapp based on a MEAN stack

    - by Lew Cohen
    Can anyone point to books, articles, blogs, or even applications - open-source or proprietary - that detail building a Web proxy? This specific proxy will exist to get around the same-origin restrictions that prevent, for instance, loading a given Website into an <iframe> in a Webapp. This Webapp is a collaborative application in which a group of users log in to the app's Website and can then load different Websites into this app's <iframe> and do various collaborative things (e.g., several users simultaneously browsing a Website, in synch). The Webapp itself is built on a MEAN stack (MongoDB, Express, AngularJS, and Node.js). The purpose of this proxy is not to do anonymous browsing or to bypass censorship. Information on how to build such a vehicle seems not to be readily available from my research. I've come across Glype but am not sure whether this is a feasible solution. I don't want to reinvent the wheel, so if a product is available for purchase, great. Else, we'd need to build one. The one that seems to be close is http://www.corsproxy.com. In effect, we'd like to re-create this since it evidently does what's needed. I don't care what server-side technology is used. Our app is MEAN-based, if that has any bearing. Also, the proxy has to obviously honor basic security considerations (user cookies, etc.) and eventually be scalable. So, anyone know of any sources that would detail how to build one of these? Is it even worth building if something already exists? If so, what would be a good candidate? Any other issues that should be considered with this proxy/application? Thanks a lot!

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  • windows 7 update freeze - what to do?

    - by Tom Tom
    Hi, yesterday I shuted down my notebook and windows 7 Ultimate started to install the automatic update. After one hour I noticed that the update is still running. I thought ok, I go to sleep and let it run. In the morning it was still running. Thus I thought it is crashed. Forced a shut-down of the notebook, and restarted it. With the same effect that the notebook is "freezing" at "Install Update 1 of 5". It does not look like whether it is chrased. The progress wheel is still moving. But it does not make any progres.. Thus somehow like crashed. Would appreciate any help! Edit: Ok was able to log-in in "save" (german: abgesicherter) mode. This way I passed to install update screen. I do not want to generally disable updates. What can I do to not install the last update, which is creating troube. Or how can I find out whats the problem with the last update? Edit2: Ok starting in save mode and finally installing the updates manually solved the problem.

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  • how could application installations/configurations be easier in linux?

    - by ajsie
    although you can do anything in linux it tends to require a lot of tweaking in config files and reading a lot of manuals/tutorials before you can have it running in your way. i know that it gets a lot easier by time, and the apt-get installations with ubuntu/debian is heading the right way. but how can linux be more userfriendly for us in the future? i thought that if more is automated like an IDE environment, eg. typing svn will give us all the commands and description about each command when you move between commands with your keyboard. that would be great. but that's just one example. another is the navigation in the terminal between folders. now you have to type a lot just to jump from/to different folders. would be great with some more automatization here too. i know that these extra features will slow down the server, but its 2010 now, and these features are not that heavy for the cpu, but makes it more userfriendly and encourage maintainance of a server, not frighten u off. what do you think about this? should/could we have more user friendly linux environment in servers, something that has annoyed you a lot? a lot of things are done in the unix way, but maybe we should reinvent the wheel in some areas, cause apparently, its so...repeatingly today and difficult to do easy tasks. it should be easier i think..

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  • virtualbox instances dedicated-server with custom dnsmasq

    - by ovanes
    I have dedicated server where I planned to run virtualbox virtual machines. Since the VMs are managed with vagrant/chef I may end up with many different ones. I thought it would be a great idea to deploy a dnsmasq on the server, which is going to dynamically assign the ip addresses to the VMs. Since each Vagrant/Chef recipe is configured to set the VM's host name I can find/reference the appropriate VM by the host name. Finally, the entire infrastructure is not directly accessible via internet, so the dedicated Server is the OpenVPN host. So the entire infrastructure may be seen as: +-------------------------------------+ | Dedicated Server | | | | +-------------+ +------------+ | +------------------+ | | DNSMasq | | OpenVPN |<==========>| Client | | +-------------+ +------------+ | | | | ^ ^ | +------------------+ | | | | | +--+ | | | | +-------+ | | | | VM1 | | | | +-------+ | | | ... | | | +-------+ | | +-| VM2 | | | +-------+ | +-------------------------------------+ Now some questions which I am struggling with: Are there any other suggestions to access private infrastructure, because I don't want to reinvent the wheel. On the Dedicated Server I don't see the vboxnet0 interface but VirtualBox is installed without GUI. Accessing of virtual boxes via ssh works fine. Did I miss smth? DNSMasq must serve the local VMs only, otherwise there is a chance that local DNSMasq start to serve other server's on the network, what I don't want. Because I don't see vboxnet0 I tend to use no-dhcp-interface=eth0 config option. Are there any thoughts on that despite, the fact that a second NW-card (which is not the case), might start serving DHCP-Requests? How should I config the VM's network interface that I am able to access it via OpenVPN and resolve the hostnames using the DNSMasq. I think it should be the host-only network card. Should I do bridging in the OpenVPN config or is it sufficient to use routing.

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  • Mouse clicks suddenly stopped working in Ubuntu

    - by DisgruntledGoat
    This is a weird one. For some reason, last night my mouse partially stopped working. Movement is fine, but the mouse buttons don't work. Mainly it's the left button, but occasionally the right click and scroll-wheel fail too. Initially I thought it could be the mouse itself (the left button seemed to get a bit "soft" recently), but I tried another mouse and had the same issue. Both are USB wireless optical mice. The keyboard is working okay 95%, only problem is Alt+Tab doesn't seem to work. Both keys work fine independently. At the time it happened I was using Chrome, I dragged to scrollbar to scroll and when I released the mouse it was still holding scrollbar. I'm using Ubuntu 9.10, I upgraded weeks ago and everything was working fine so I don't think it's related to that. I also hadn't run any updates (I have now just in case something fixed it). But no luck. Any ideas?

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  • Why does a document in Word 2007 stop recognizing the mouse after the document loses focus?

    - by alt234
    When I open a document in Word 2007, everything works fine, I can edit, highlight text, etc. However, the instant Word loses focus, when I focus back the document doesn't recognize anything the mouse does. The tabbed menu at the top seems to recognize the mouse but the document itself does not. I can scroll through via the scroll-wheel and I can type. However, typing just shows up where the mouse cursor last was before focus was taken away. I've tried clearing some word data registry keys. I've also found that some Word Add-ins can cause problems. LaserFiche is one I see mentioned a lot. As far as I can tell I have no add-ons though. Any ideas? It's crazy-annoying. UPDATE- - Word is the only program that has this problem - Typically I have Toad (Oracle DB management app), an XP virtual machine with various apps running on it, Skype, Google Talk, and maybe a handful of other programs at any given time open... Windows Media player, Outlook. - Yes, this happens even if nothing else is running. From a fresh restart as well. - I'm running Vista 64 with SP1 - According to Windows Update, I have the latest of everything. This has been happening for a couple of months now. Just never took the time to look into because I usually never have to use word.

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  • Can't open cocoa emacs from terminal using open -a

    - by Shane
    I installed emacs on my macbook air running os x 10.6.5 from this site http://emacsformacosx.com/. I believe this is what used to be called cocoa emacs. I dragged it into my Application folder and it works fine when i run it from there. I want to be able to run it from terminal. After some googling, i tried open -a /Application/Emacs.app foo.txt (foo.txt was and existing file). I got two emacs windows - one with welcome screen and one with foo.txt loaded. I tried a few applications in the /Applications directory and they did not seem to behave like this. I had installed it using my own account (an admin account) so after doing ls -l on /Application I noticed that the owner and group were different from the other entries in this folder. I recursively changed the owner and group to root and wheel, like the others, but this did not help. The only thing that looks funny now is that there that ls -l show a @ character which has something to do with extended attributes but i don't know how to check these. Any suggestions on what to check next? Is using the open command the only to run the program? Can I simulate what it does using a shell script?

    Read the article

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