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  • Best practice for scaling a single application source to multiple nodes

    - by Andrew Waters
    I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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  • No boot device found. Press any key to continue

    - by Andrew Banks
    I took out the hard drive from my Dell Latitude E5420 notebook, put in an ADATA S599 solid state drive, and installed Ubuntu 11.10. When I boot, the Dell BIOS splash screen appears with a progress bar, which quickly fills up, and the screen goes black. All of this is like it was before. At this point, the OS splash screen should fade in. Instead, I was dismayed to see simply the following, in white text on a black screen: No boot device found. Press any key to continue After looking around for the Any key (just kidding) I press a key, and the Dell BIOS splash screen appears again with a progress bar, which quickly fills up, and the screen goes black. This time, however, the Ubuntu splash screen shows up, Ubuntu opens up, and all is normal. Every time I shut down, however, this happens again. It's like a game the computer and I play together. The computer has never started up without first saying: No boot device found. Press any key to continue and it has always started up after I press any key to continue. It also starts up fine if I click Restart instead of Shut Down. Thoughts?

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  • Routing / binding 128 IPs to one server

    - by Andrew
    I have a Ubuntu server with 128 ip's (static external ips 86.xx.xx.16), and I want to crawl pages thru different ip's. The gateway is xx.xxx.xxx.1, the main ip is xx.xxx.xxx.16, and the other 128 ip's are xx.xxx.xxx.129/255. I tried this configuration in /etc/network/interfaces but I doesn't work. It work if I remove the gateway for the aliases eth0:0 and eth0:1. I think this is routing problem. auto lo iface lo inet loopback auto eth0 auto eth0:0 auto eth0:1 iface eth0 inet static address xx.xxx.xxx.16 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:0 inet static address xx.xxx.xxx.129 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:1 inet static address xx.xxx.xxx.130 netmask 255.255.255.128 gateway xx.xxx.xxx.1 Also, please tell me how to "reset" every changes that I made in networking and routing. Update: I removed the gateway and now it works. I can reach the website thru all 128 ip's. But when I try to bind a socket connection in php to a specific ip I get no answer. socket_bind($sock, "xx.xxx.xx.xxx"); socket_connect($sock, 'google.com', 80); I tryed to use a sniffer to see the packets, and I see the packet sent from binded ip to google.com but the "connection" can't be established. I don't know anything about "route" command, but I have a feeling that this is the solution.

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  • Windows 7 System File Checker (sfc) not working

    - by Andrew
    I have a strange problem with Windows 7 RTM. I'm running Ultimate 64-bit edition. Whenever I run sfc /scannow I get this error: Windows Resource Protection could not start the repair service. My research so far has told me that I need to set the Windows Module Installer and Windows Installer services' startup types to Manual. They already were, so I manually started those services and tried again. No luck. I've even booted into my Windows 7 repair disc and tried running sfc /scannow from that. All I get is this: A repair operation is already pending. Restart and try again. History: I'm trying to run sfc because I am unable to open any images in Windows Photo Viewer. Whenever I try, I get the error "Class not registered." I believe the problem started after I installed Gladinet, but I can't be sure. I've uninstalled Gladinet, but the problem remains. System Restore was disabled (yes, I know I'm stupid - you don't have to remind me). Please help. Thanks.

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  • How to disable autocmd or augroup in vim?

    - by Andrew Vit
    Given I have a group of commands such as: augroup MyGroup autocmd CursorMoved * silent call MyCommandOne() augroup END I want to disable all the autocommands in MyGroup for a time and then re-enable it later. Is there anything I can do with the group? Specifically, is there a way to disable the whole group at once? If not, what can I do to disable individual commands? Looking at the help, I only see a few options: augroup! will delete the whole group: I don't think this is right since I will want to re-enable it again. (But maybe there's a way to easily redefine the group again?) :noautocmd will only disable the callbacks for a one-off invocation of a command. (And it disables all autocmds, not specified ones) eventignore addresses the event binding, not the command: it sounds like it disables all bound commands for a given event, not just one command or a group I can specify. How is this done?

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  • Disable Certain Firefox Plugins System-wide by Default

    - by Andrew Case
    I have firefox installed system-wide for all our users. Unfortunately the Adobe Reader Plug-in is rather flakey and doesn't work some of the time. As a result I want to disable the plug-in by default for all our users, but still allow them to enable it if they want via the standard Tools-Add-ons-Plug-ins menu option. How can I have this plug-ins enabled/disabled status be disabled by default? I've been able to configure system-wide configurations before by setting preferences in the mozilla root folder file defaults/pref/all.js, but enabled/disabled plugins doesn't appear to be configured in the preferences. [edit 1]: I found 'How to manage firefox plugins in pluginreg.dat file' which explained some of the formatting of the pluginreg.dat file. From there I could see flags are masked as follows (from nsPluginHostImpl.h): #define NS_PLUGIN_FLAG_ENABLED 0x0001 // is this plugin enabled? #define NS_PLUGIN_FLAG_OLDSCHOOL 0x0002 // is this a pre-xpcom plugin? #define NS_PLUGIN_FLAG_FROMCACHE 0x0004 // this plugintag info was loaded from cache #define NS_PLUGIN_FLAG_UNWANTED 0x0008 // this is an unwanted plugin #define NS_PLUGIN_FLAG_BLOCKLISTED 0x0010 // this is a blocklisted plugin But is there a way to add this to the defaults so that that NS_PLUGIN_FLAG_ENABLED is removed by default?

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  • Is is possible to hide label colors in list view in Mac OS 10.X Finder? I use labels as star ratings

    - by Andrew Swift
    I have modified the first five label names in OS X Lion to be ? through ?????. This way I can easily tag photos etc. in the finder. However, I find that Apple's rendering of the colored bars is horrendously ugly. I'd like to keep the labels (to be able to sort by label) but not see the colors. I know it was possible to change the colors with Label X, but Unsanity has not issued an update for Lion. I don't need to change the colors, just find a way to hide them in the finder.

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  • Shorewall SHOW DYNAMIC command doesn't work

    - by Andrew Burns
    Setting up shorewall dynamic zones, http://shorewall.net/Dynamic.html shows the command shorewall show dynamic zone where zone is one of your zones. I can get the add and delete commands to work, but not the show dynamic command. Here is a shell session, with output from ipset list that proves that the items are indeed there. $ ipset list CPREM_br0 Name: CPREM_br0 Type: hash:ip Header: family inet hashsize 1024 maxelem 65536 Size in memory: 16520 References: 66 Members: 192.168.85.153 $ shorewall add br0:192.168.85.200 CPREM Host br0:192.168.85.200 added to zone CPREM $ shorewall show dynamic CPREM $ ipset list CPREM_br0 Name: CPREM_br0 Type: hash:ip Header: family inet hashsize 1024 maxelem 65536 Size in memory: 16536 References: 66 Members: 192.168.85.153 192.168.85.200 $ shorewall delete br0:192.168.85.200 CPREM Host br0:192.168.85.200 deleted from zone CPREM $ ipset list CPREM_br0 Name: CPREM_br0 Type: hash:ip Header: family inet hashsize 1024 maxelem 65536 Size in memory: 16536 References: 66 Members: 192.168.85.153 I am using the packaged version from Ubuntu 12.04 (4.4.26.1-1)

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  • How to install/configure ffmpeg to compress mp4 videos for flash player delivery?

    - by Andrew Fulton
    We have a flash web-app that created interactive video, and are using ffmpeg to do some compression/resizing when a user "publishes" their project. The user can upload flv files and mp4 files, both of which play fine in the Flash UI before publishing. After publishing the flv files work fine, but the mp4 files will not play in the flash player: Audio will play but video won't. The mp4 files will play fine if I download them and play them in the Quicktime player but if I attempt to open them in the Adobe Media Player it reports "The media file does not contain a supported video track". If I open the Movie inspector in quicktime it tells me that the original file is an "h264" video and the ffmpeg-processed ones are "mpeg-4". I have tried forcing it to h264 by adding flags like -f h264 and -vcodec h264 but I get a screenfull of errors (no frame, illegal POC type, sps_id out of range) ending with Could not find codec parameters (Video: h264) h264 will show up if I run ffmpeg -formats and ffmpeg -codecs, and as I said it will play fine in Quicktime. Is there anything else I need to do to convince the flash player to play them? Is there anything else I need to tell you about the server that will help?

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  • Backup files from Linux client to Windows Server

    - by Andrew
    I'm trying to backup my files from my Linux box to my Windows Server 2008 as a push, and when I delete them from my Linux box, they remain on my Windows Server. I've found lots of sources that are similar, but most results were from Windows to Linux. I managed to find slightly more similar cases like Using rsync and cygwin to Sync Files from a Linux Server to a Windows Notebook PC, and rsync from Windows PC to remote Linux server, with the most similar being a backup from Linux to Windows Server, but through a pull from the Windows Server. Initially, I used Unison because I thought having the 2-way capability would come in handy, and I would just have to set some configurations to make it 1-way. Unfortunately, I couldn't find the right configuration, and only managed to synchronize using the command unison "profile" -ui text -auto -silent. When I deleted the files on my Linux box, the files in the Server got deleted too, which of course, isn't what I want. When I tried to find any options for Unison, I only discovered the -force option, which didn't help, since what I wanted was an incremental update to the Server. I found out I could achieve this from using rsync and the -a option (archive), which would keep adding files even if I deleted them from my Linux box. I installed Cygwin on my Windows Server, configured an SSH daemon, but I can't seem to get it working. I've also already configured Windows Firewall to open port 22 (both inbound and outbound). I used the following command from my Linux box: rsync -avrzn /folder/to/be/backed/up/ [email protected]:/cygdrive/c/place/to/store/backed/up/files (a - archive, v - verbose, r - recurse into subdirectories, z - compress, n - dryrun) but it just won't work. Can anyone help me out? I don't mind using either Unison or rsync, as long as it achieves what I want.

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  • Difficult to point-and-click target with Apple Magic Trackpad?

    - by Andrew Swift
    My Magic Trackpad is great for most things involving dragging and gestures, but for simple point-and-click use it is starting to get really annoying. For example, my bank has a numeric code that I need to enter from a visual grid on the screen, by clicking on the six numbers in order. To do this is quite difficult with the Magic Trackpad. Idea 1: it is because when you start dragging on the touchpad, there is a brief delay before the mouse starts to move. The delay might be enough to screw up my anticipation of where the cursor is going to go. Idea 2: it may have to do with the cursor acceleration. If I move it a little, the cursor moves a little. If I move it a lot, it goes much faster. I have tried various settings in the preference pane, and although the cursor does move more or less quickly, it doesn't seem any more or less easy to hit a given target. As I am writing this post, I tried a brief experiment -- I chose a spot on the page (the bracket in the superuser logo) and tried to move the cursor there in one quick movement. It's extremely difficult, even though I've been using Macs and touchpads since 1999. There is something about the behavior of the trackpad that is making it impossible for me to learn how to accurately predict where the cursor will end up. Does anyone else have this problem?

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  • Set origin for forwarder based on virtual domain in Postfix

    - by Andrew Koester
    I currently have a machine set up to operate with two domains. The main name uses the standard Unix-user delivery, and the second domain is entirely virtual (using virtual_alias_domains and virtual_alias_maps), with the second domain only forwarding mail. However, when mail is forwarded, it still appears to be delivered by the host of the primary domain (presumably set by myorigin.) Is it possible to get it so when mail is forwarded to the virtual domain, it appears to be delivered by it as well? That domain is on another IP and I'd like to use it so the mail stays consistent. Thanks.

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  • How does Notepad++ know to recognize the HTML and CSS in PHP files? Can I do this with PSP files?

    - by Andrew Alexander
    I am trying to get Notepad++ to recognize PSP (Python Server Pages) files. I've got it to recognize Python (by adding PSP to the ext= section), however it doesn't seem to understand that Python is only within the <% %> and <%= %> sections. I want it to parse HTML, CSS, Javascript and possibly even PHP (though if I am using PSP, I'd probably stick with that) as well, showing all the colors, etc, that would normally be associated with it. How do I go about that?

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  • Local and public IPs on the same switch?

    - by Andrew
    It's all pretty much in the title. Is it possible to assign both local and public IPs to different nodes connected to the same switch? I have 4 servers with 2 gigabit ethernet ports each. I want one of each to have a public IP, and the remaining ports to have local IPs for server-to-server traffic. Sorry if it's a dumb question. I didn't see anything about it on here already.

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  • Kindle for PC - page loading problems

    - by Andrew Heath
    When viewing books in Kindle for PC, often going to the next page will change the line count at the bottom of the screen but not refresh the page view. Then, if you hit next again, you end up on the next next page (+2 rather than +1). This happens to me going backwards as well. Using arrow keys, or mouse clicks, or page down/up all creates this error. There doesn't seem to be any pattern to the occurrence other than "frequently". It happens on my Win7 64 bit and Win XP machines. I've only one Kindle book at the moment, PHP Object-Oriented Solutions by David Powers, so I suppose it could be a problem specific to that book. Does anyone else have this issue? It is extremely irritating to be constantly flipping back and forth just to get the page view to show the proper page.

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  • Multi-account Google Apps Calendar Free-busy status?

    - by Andrew Bolster
    I have 3 google apps domain accounts and a personal google account, and until recently, there was little need for the google app's calendars to have any real use; Now however the powers that be finally discovered the smart re-scheduler and the other google tools for managing meetings and schedules; unfortunately I'm now in a position where I've got events notifications all over the place and because each of the calendars do not know about each other, I'm losing all of the advantages of rescheduler / free-busy status. TL;DR, 4 calendars, unified 'free busy' status without having to manually copy every event please.

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  • Colors less saturated in Snow Leopard Finder, Preview & Safari than in Chrome -- why?

    - by Andrew Swift
    If I look at the picture here in Safari, Preview or the finder, the shades of blue are significantly different than if I look at the picture in Google Chrome (they are less saturated than in Chrome). Since I am a photographer and need to prepare pictures for publication online, I need to know what a jpeg should really look like, in order to color-correct it. I have an excellent Eizo monitor that is correctly calibrated. If I open the same image in Photoshop CS3, I get the Chrome colors if I use Monitor RGB under view proof setup, and I get the Safari colors if I use Macintosh RGB. Can anyone explain the difference between these two settings, and the difference between Safari and Chrome? Which colors are correct? Photos that I prepared under Windows (during the past five years) now seem washed out in the Apple Finder and Preview, even though I had correctly prepared them. Is there a setting on the Macintosh for color calibration, besides the monitor calibration control panel?

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  • Memory management (segmentation and paging) in 80286 and 80386: How does it work?

    - by Andrew J. Brehm
    I found lots of Web sites and books explaining how memory management worked on the 8086 and later x86 CPUs in Real Mode. I understand, I think, how two 16 bit values, segment address and offset are combined to get a linear 20 bit physical address (shift segment four bits to the left, add offset; segments are 64K and start every 16 bytes). But I couldn't find any good Web sites or books that explained how memory management works in Protected Mode, specifically the differences between 80286 and 80386. Can anyone point me to a good Web site or book (or explain it right here)? (For extra credit, i.e. an upvote, how does it work in Long Mode?)

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  • Schedled Tasks and Environment Variables

    - by Andrew J. Brehm
    I have a scheduled task, a batch file, that uses an environment variables which is set system-wide. On server 1, the scheduled task runs under a domain account and the environment variable works. The environment variable also exists in my session and when I runas as the service account. On server 2, the scheduled task runs under a different domain account and the environment variable DOES NOT work. However, the environment variable does exist in my session and when I runas as the service account. On both servers the environment variable has been set system-wide by the same script originally. The script runs again every now and then and as far as I can see noone has tempered with the environment variable. The scheduled tasks are set up identically on the two servers (using the same XML file) and the two service accounts are identically configured (as far as I know). What am I doing wrong?

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  • Tools to manage large network of heterogeneous web applications?

    - by Andrew
    I recently started a new job where I've been tasked with managing a global network of heterogenous web applications. There's very little documentation. My first order of business is to create an inventory of all of the web applications. Are there any tools out there to manage a large group of web apps? I'd like to collect a large dataset for each website including: logins for web based control panels logins to FTP/ssh accounts Google analytics tracking code for each site 3rd party libraries used SSL certs, issuers, and expiration dates etc I know I could keep the information in Excel or build a custom database, but I'm hoping there's already a tool out there to help me with this.

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  • logrotate: neither rotate nor compress empty files

    - by Andrew Tobey
    i have just set up an (r)syslog server to receive the logs of various clients, which works fine. only logrotate is still not behaving as intending. i want logrotate to create a new logfile for each day, but only to keep and store i.e. compress non-empty files. my logrotate config looks currently like this # sample configuration for logrotate being a remote server for multiple clients /var/log/syslog { rotate 3 daily missingok notifempty delaycompress compress dateext nomail postrotate reload rsyslog >/dev/null 2>&1 || true endscript } # local i.e. the system's very own logs: keep logs for a whole month /var/log/kern.log /var/log/kernel-info /var/log/auth.log /var/log/auth-info /var/log/cron.log /var/log/cron-info /var/log/daemon.log /var/log/daemon-info /var/log/mail.log /var/log/rsyslog /var/log/rsyslog-info { rotate 31 daily missingok notifempty delaycompress compress dateext nomail sharedscripts postrotate reload rsyslog >/dev/null 2>&1 || true endscript } # received i.e. logs from the clients /var/log/path-to-logs/*/* { rotate 31 daily missingok notifempty delaycompress compress dateext nomail } what i end up with is having is some sort of "summarized" files such as filename-datestampDay-Day and corresponding .gz files. What I do have are empty files, which are eventually zipped. so does the notifempty directive is in fact responsible for these DayX-DayY files, days on which really nothing happened? what would be an efficient way to drop both, empty log files and their .gz files, so that I eventually only keep logs/compressed files that truly contain data?

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  • smartOS HPC config suggestion

    - by Andrew B.
    I'm configuring a brand new HPC server and am interested in using SmartOS because of it's virtualization control and zfs features. Does this configuration make sense for a SmartOS HPC, or would you recommend an alternative? System Specs: 2x 8-core xeon 384 GB RAM 30 TB HDs with 2x512GB SSDs Uses: - zfs for serving data to different vms, and over the network; 1 SSD for L2ARC and 1 for ZIL - typically 1-2 ubuntu instances running R and custom C/C++ code My biggest concerns as a newbie to SmartOS and ZFS are: (1) will I get near-metal performance from ubuntu running on SmartOS if it is the only active vm? (2) how do I serve data from the global zfs pool to the containers and other network devices?

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