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  • Cloud service and IM protocol advice, for a backend to group chat mobile app

    - by Jonathan
    Overview I’m going to develop an app on Android and iOS. It will allow users to set up group ‘chat rooms’ and talk on chat rooms set up by other users. The service needs to be highly scalable, such that it could accommodate a massive increase in users overnight (we can only dream). Chat requirements The chat protocol used should be flexible: it should allow me to determine who can view/post on ‘chat rooms’ based on certain other factors, as determined by the first poster/creator of the particular ‘chat room’. It should also allow for users to simply install the app and begin using the service, after only providing a simple nickname (which could be changed later). Chat protocol plans Having looked around I think the XMPP protocol is the best candidate. In particular the Multi-user chat extension looks like what I’ll need. Would this be most suited to my requirements, or do you know another potential solution? Cloud service I have been deciding between Amazon Web Services, Google App Engine and Windows Azure. I’m coming to the conclusion that Azure will be best, as it is easier to manage than AWS (ease of scalability will be a key factor in the design), I think it may be less restricted than GAE, plus Azure will soon have toolkits to allow easy interfacing with both Android and iOS phones. Is this the decision you would have made, or would you recommend/look into other cloud services? General project philosophy I have only recently started looking into this project’s feasibility, and am no expert on any of its aspects. So wherever possible I will leave the actual implementations to experts, i.e. choosing a higher-level cloud service, using a well-documented plugin of a, proven reliable, group chat protocol etc. My background I have some programming knowledge from a computer science degree. Main languages I’ve used have been Java and Python, but I don’t want this to affect design decisions for the project. The most appropriate languages for the task should be used, i.e. I don’t mind learning a lot of new skills (my current programming levels are relatively basic anyway). Thank you Thanks for reading, and any advice you have about any aspect would be greatly appreciated :-)

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  • Why's SMC failing on startup?

    - by Brian Knoblauch
    Trying to remove a user from one of our servers, but I seem to be thwarted at every turn... SMC refuses to load the user list (failing with a NoClassDefFoundError in the listAll method of UserContent). vipw just returns with "vipw: /etc/passwd file busy". I'm the only user on the system at the moment (it's our backup SRSS box), and both of these fail even right after a reboot. I don't have console access at the moment either unfortunately (or I would try single user mode). Of course, even if init mode S worked and let me do this one task, it doesn't solve the root problem. Ideas?

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  • No app icons in menus

    - by Lyrositor
    I have enabled icons in menus, and most of them show up well (folder icons, file icons, save icons, etc.). But whenever an app tries to use an icon specific to itself, such as GIMP, it replaces that icon with the app icon, so that when I look at a menu in GIMP, I see most of the time just icons of GIMP's logo (that seems to be the only problem; the text is fine). I thought this was proper to GIMP, but I also noticed it happening on AbiWord. Thankfully, as I said, it's not for all icons. But it still bugs me. Why is it so? Here is a screenshot of a menu in GIMP: I am using Ubuntu 11.04 Natty Narwhal, with Unity desktop (the problem also occurs on the Classic desktop, if I remember correctly). EDIT: This does NOT occur on the Classic desktop; only in Unity.

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  • Solr startup script problem

    - by Camran
    I have installed solr and it works finally... I have now problems setting it up to start automatically with a start command. I have followed a tutorial and created a file called solr in the /etc/init.d/solr dir... Here is that file: #!/bin/sh -e # SOLR auto-start # # description: auto-starts solr engine # processname: solr-production # pidfile: /var/run/solr-production.pid NAME="solr" PIDFILE="/var/run/solr-production.pid" LOG_FILE="/var/log/solr-production.log" SOLR_DIR="/etc/jetty" JAVA_OPTIONS="-Xmx1024m -DSTOP.PORT=8079 -DSTOP.KEY=stopkey -jar start.jar" JAVA="/usr/bin/java" start() { echo -n "Starting $NAME... " if [ -f $PIDFILE ]; then echo "is already running!" else cd $SOLR_DIR $JAVA $JAVA_OPTIONS 2> $LOG_FILE & sleep 2 echo `ps -ef | grep -v grep | grep java | awk '{print $2}'` > $PIDFILE echo "(Done)" fi return 0 } stop() { echo -n "Stopping $NAME... " if [ -f $PIDFILE ]; then cd $SOLR_DIR $JAVA $JAVA_OPTIONS --stop sleep 2 rm $PIDFILE echo "(Done)" else echo "can not stop, it is not running!" fi return 0 } case "$1" in start) start ;; stop) stop ;; restart) stop sleep 5 start ;; *) echo "Usage: $0 (start | stop | restart)" exit 1 ;; esac Whenever I do solr -start I get this error: "Error occurred during initialization of VM Could not reserve enough space for object heap" I think this is because of the file above... Also here is where I have solr installed: var/www/solr and here is the start.jar file located: var/www/start.jar Help me out if you know whats causing this. Thanks BTW: OS is ubuntu 9.10

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  • NTOP gives warnings on startup

    - by FR6
    I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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  • NVCPL.DLL in RunDLL can't be initiated on startup

    - by Alfred Larsson
    I got a new computer and installed Windows 8. But everytime I start up I get this message: (Couldn't post the images because of my low reputation. But here is what they said) Was in Swedish, translated: RunDLL There was a problem with the start of NVCPL.DLL The initiation of a DLL-file failed I have no idea what it does and how to fix it. I don't know if this will help but I have got some more problems with DLL files. Here is an example: ** QuickTime for Windows** A problem has occurred with the windows-installer package. A DLL-file which is needed for this installation couldn't be used. Contact support or distributor.

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  • How can I recover from a frozen app when connecting over VNC

    - by Pablojim
    I have a htpc running 10.10. It has no keyboard or mouse attached, so I connect over vnc for administration and manual tasks. This usually works fine but every so often an app running in fullscreen mode crashes. All I want to be able to do is kill this app from VNC. Is there a keyboard shortcut to do this that will preserve the VNC connection? If I use CTRL + ALT + F1, I see the terminal but can no longer control it from VNC. Trying to return to the desktop doesn't work either? Any easy process I can follow?

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  • MacPro will freeze after first startup and first time screen saver activates

    - by Rob Segal
    I've run into a bizarre situation every time my MacPro first starts up in the morning when I get to work and the screen saver activates for the first time. When I try to deactivate the screen saver hitting the keyboard or mouse nothing will happen. At best I will get one of the following... Able to move the mouse but clicking does nothing Login prompt will show up but typing on the keyboard does nothing At worst the screen will be fully locked. In all cases I will have to reboot my machine to get it to work again. After this initial restart the machine is fine for the rest of the day. Anyone encountered something like this before?

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  • xcode IOS5 Creating one app from several apps

    - by Yaniza Familia
    This is my situation. I have about five different apps and they all perform well. I will like to make one app with all these little apps. How can I go about this with a master view application? Also these were created with nib file (xib) no storyboard. Can I create my files with storyboard or do I have to continue creating files with xib? Also, what to do with app delegate (UIApplicationDelegate) methods that are implemented in all applications? Please explain no knowledge on this part.

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  • Linux Defualt Startup Display PCI to fix black boot screen

    - by Jonathan
    You heard it all before black screen on boot after perfectly fine install of most linux ubnuntu mint etc distributions (the netbook works fine) It has an Intel N10 integrated graphics chipset. I have actually found that if I plug in an external display then remove it the default screen turns on and my laptop works fine drivers all great - I have tried the screen cycle button fn f7 but doesn't work when no display is plugged in. It also works out all the correct resolutions and no modification of the grub bootloader or creating any xorg configs. So I think my monitor is forcing to a display that doesn't exist. Do you know if there is anyway I can force it to choose a different screen at boot so I can get a login screen? I can use nomodeset on grub but xrandr cant add the damned 1024 600 60 resolution that I need! Ideas guys?

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  • How to Find Your Lost Android Phone, Even if You Never Set Up a Tracking App

    - by Chris Hoffman
    Android doesn’t come with a “find my Android” feature, so there’s no official way to track your phone if you lose it. You should prepare your phone for loss by setting up such a tracking app — but what if you didn’t? Your first instinct may be to download Lookout’s Plan B, which has been the go-to app for this purpose. However, Plan B only runs on Android 2.3 Gingerbread and lower, so modern Android phones will require a new solution. If you are still running 2.3 or lower, you should definitely check it out, but everybody else can keep reading.    

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  • Explorer.exe does not starts itself at the startup

    - by Maven
    The problem I am facing is whenever I start my PC after use login window where it should show the start screen my PC just doesn’t show anything except for a mouse cursor. I can press CTRL ALT DELETE and go into task manager go into File Run New Task and then run explorer.exe sometimes this works and start screen becmoes accesible but sometimes I have to repeat it multiple times to make it work or sometimes I just have to restart my PC. More over while on the black screen and being able to access task manager If I right click processes there and open containing folder that also work I can access all my program/files from there but all that is missing is my desktop and start screen Can anybody help me with this? Plus can anybody tell like for explorer there is explorer.exe is there a .exe file which would start the start screen ?

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  • Linux Startup Script after Gnome Login

    - by Eric
    I have a Fedora server that I want to spawn an interactive python script after the user logs on. This script will ask the user for various types of information for configuring the system or it will search for the previous config file and show them the predefined information. Originally I was going to put this in rc.local or make it run with init.d but that messed up the boot due to how the script is spawned. So I would like this script to run as soon as the user logs in to Gnome. I've searched around quite a bit and found this answer which appears to be exactly what I want, but it isn't working the way I want it to. Below is my entry. [Desktop Entry] Name=MyScript GenericName=Script for initial configuration Comment=I really want this to work Exec=/usr/local/bin/myscript.sh Terminal=true Type=Application X-GNOME-Autostart-enabled=true Whenever I login, nothing happens. So I then did a test to modified "myscript.sh" to just echo some text to a file and it worked fine. So it appears the portion that isn't working is the script popping open a terminal and waiting for the users input. Are there any additional options I need to add to make this work? I can confirm when I run /usr/local/bin/myscript.sh from the CLI it works fine. I have also tried adding "StartupNotify=true" and still no luck. Edit @John - I tried moving my Exec= to /usr/local/bin/myscript-test and this is what myscript-test contains. #!/bin/bash xterm -e /usr/local/bin/myscript.sh Yet again, when I just run the myscript-test it works fine. However when I put that in my autostart, nothing happens. Edit 2 - I did a few more tests and it did start working but I had to remove Terminal=True before the xterm would pop. Thanks for your help.

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  • Windows 7 Automatically Connecting To Unsecured Wireless Networks On Startup

    - by Xtend
    Most of the questions on this topic related to folks connecting to somebody else's wireless network when their own was available and could remedy the situation by going to their connections and unchecking the "connect automatically" box. See this: " Avoid automatically connecting to wireless network on windows 7 " as an example. In my situation, I've noticed that Win 7 will automatically connect to any unsecured wifi network - even if I have never connected to it in the past. If I am traveling and boot Win 7, it will start and connect to what appears to be the best signaled unsecured network without prompting me for confirmation (note: in the above link, "Naveen" seems to have same problem). Obviously, that is a security concern to me. Further, when I open "Network and Sharing" and "Manage wireless networks" the network is not displayed (probably because I labelled it a public network). Again, these are new, never connected with before, wireless networks. I always promptly disconnect from them but don't want to have to be on constant guard for an auto connection to a malicious network. This began about a month ago, as I recall, Win 7 did not behave like this in the past, I didn't monkey with wifi settings, and don't use a 3rd party connection manager. I did have to download some internet security certificates for army website access but I don't think that should mess with network settings. Any ideas how I can tell Win7 cease automatically connecting to networks or, at least, to prompt me for a confirmation before connecting?

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  • New Pluralsight app for Android will bring variable speed

    Usually, it is very interesting to compare the 'same' software applications and apps between various platforms, and the Pluralsight offline players are an outstanding example to have a closer look at. The original Silverlight desktop offline player, the iOS app of Pluralsight and the new HTML5 online player all have variable playback speed. Just the Android app doesn't. But not for long. A couple of days Pluralsight finally announced that their development department found a reliable solution to provide flexible speeds. For the brave ones among us, please have a look at the public beta they are offering on their blog article.  Please be aware of, that using any Pluralsight offline player requires to have a Plus subscription. Otherwise, you cannot use the application after all.

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  • amavisd Net server pid file already exists after system crash and startup

    - by Simiyu
    Hi all, whenever i have an unclean shutdown, which is often due to power failure most of the time i get problems with amavis starting up. The error amavisd Net server pid_file already exists for running process comes when i start it under debug mode, so i always have to delete the amavisd.pid and amavisd.lock files manually before it starts. Is there a way i can stop this from happening or get a way to delete the files during reboot in the case of an unclean shutdown. Thanks

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  • Asterisk failing at startup after upgrading to asterisk18

    - by Supratik
    I was using asterisk16 and asterisk16-skypeforasterisk, which was working fine. I have recently upgraded to asterisk18 and asterisk18-skypeforasterisk, after that I am receiving the following error message. Asterisk ended with exit status 1 Asterisk died with code 1. Asterisk could not start! Use 'tail /var/log/asterisk/full' to find out why. When I checked the log I got the following messages. codec_g729a.c: == Found total of 11 G.729 licenses translate.c: empty buf size, you need to supply one Now, if I remove the /var/lib/asterisk/licenses folder it works fine. Can you please tell me what could be the issue here ? Warm Regards Supratik

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  • Staggering java linux process startup to prevent OOM

    - by ctennis
    I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all relatively quickly, and so we get 10 or so java VMs restarting all at the same time (we use daemontools for the service stops/starts), which wreaks havoc on the machine, in terms of OOMs or just really slow. This is because it's spawning the JVM 10x at the same time. Other than trying to stagger the startups, is there a smarter way of handling this? Maybe a sysctl tuning performance parameters, or a JVM parameter?

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  • HDFS datanode startup fails when disks are full

    - by mbac
    Our HDFS cluster is only 90% full but some datanodes have some disks that are 100% full. That means when we mass reboot the entire cluster some datanodes completely fail to start with a message like this: 2013-10-26 03:58:27,295 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Mkdirs failed to create /mnt/local/sda1/hadoop/dfsdata/blocksBeingWritten Only three have to fail this way before we start experiencing real data loss. Currently we workaround it by decreasing the amount of space reserved for the root user but we'll eventually run out. We also run the re-balancer pretty much constantly, but some disks stay stuck at 100% anyway. Changing the dfs.datanode.failed.volumes.tolerated setting is not the solution as the volume has not failed. Any ideas?

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  • Chrome keeps chrashing a short while after startup

    - by cypher
    Hi, whenever I turn on Chrome, it crashes after a very short while (less than a minute). It started happening about a week ago for no apparent reason. I didn't install any new software, update or uninstall anything (as far as I remember), it just crashes. It doesn't matter wether I even open any page or not, Chrome just dies, period. Doesn't anybody have an idea why might that be? I'm running on Windows Vista Home Basic.

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  • Is shared hosting enough for feed reader app?

    - by Mahdi
    I'm developing an Feed reader app. Feeds are downloaded to my server when someone requests it. then they download to user's computer. There will be 1-2 minutes cache for popular feeds. We expect that there will be 1000-5000 users (that use our app) Is a shared hosting (which currently serves almost 100 website, and it will serve 500 websites at maximum) enough for this purpose? or we should look for VPS or Dedicated hosting? Note: Our shared hosting plan has unlimited disk space and unlimited bandwidth.

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