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  • Clustering/load balancing for cluster unaware applications

    - by AaronLS
    Forgive me if I use any of these terms incorrectly. I am wondering if there is any kind of software that would allow my two "join" two computers together such that a cluster unaware application could utilize their combined computing resources? By "cluster unaware" I mean an application that isn't designed to share work across multiple services. My understanding is that clustering is enabled by the specific application by it's architecture, such that messaging with multiple instances of the application coordinate the sharing of work. Instead I am looking for something that enables clustering at the OS or virtualization level, so that any application could essentially be clustered. Failing that, I am also wondering about the following scenario: We have 3 different applications we will call A, B, and C. We have 2 single core computers. At any given time lets say that any combination of those applications will be CPU intensive. In cases where only 2 of those apps are very active, have one of them moved over to a different server. In a nutshell, some sort of dynamic automatic shuffling of the application's load. I have heard of virtual machines that can be migrated across physical machines while live, but I am wondering if this can be done automatically in response to an application's or VM's CPU activity?

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  • USB To Serial under OpenSuse 11.3

    - by Exsisto
    I have a LogiLink USB-To-Serial adapter. This has the PL2303 chip inside. When I insert the device: [26064.927083] usb 7-1: new full speed USB device using uhci_hcd and address 9 [26065.076090] usb 7-1: New USB device found, idVendor=067b, idProduct=2303 [26065.076099] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [26065.076105] usb 7-1: Product: USB-Serial Controller [26065.076110] usb 7-1: Manufacturer: Prolific Technology Inc. [26065.079181] pl2303 7-1:1.0: pl2303 converter detected [26065.091296] usb 7-1: pl2303 converter now attached to ttyUSB0 So the device is recognized and the converter is attached to ttyUSB0. When I do screen /dev/ttyUSB0 9600 I get the error: bash: /dev/ttyUSB0: Permission denied So I went looking in the file permissions. ls -l from the /dev folder reports: crw-rw---- 1 root dialout 188, 0 2011-04-26 15:47 ttyUSB0 I added my user lars to the dialout group. When I use the commands groups under lars it shows that I'm in the group. Though I still recieve the permissions denied error, as lars, and as root. I'm trying to connect to a console cable to configure some Cisco switches. My OS is OpenSuse 11.3 x86_64 with kernel version 2.6.34.7-0.7-desktop.

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  • How to keep Ubuntu 11.10 and Kate editor w/terminal from changing command line when changing tabs?

    - by Kairan
    I am programming C using Kate editor in Ubuntu 11.10. It works great, but when I change tabs in Kate, the terminal line changes to the file path of the tab I click on. Normally this is not a big deal (other than annoyingly adding extra text to my terminal) however if I am currently RUNNNING a C program, it obviously will type at the command line, which is not so cool. Example terminal window for my C program (its at a menu): 1) select opt 1 2) select opt 2 Enter choice: (here it waits for prompt from user) Now when I click a tab in Kate, it wants to put in the cd / path of the file in that tab, such as: cd /home/user/os/files And of course since my terminal was waiting for prompt from user it gets that command.. not good. Perhaps there is no fix, but maybe someone knows? Obviously I could choose NOT to switch tabs or end program before switching tabs... Note: I probably made the mistake of putting this under StackOverflow which is more of a programming area - so though repost here might be best (I am not sure how to link the questions but will paste hyperlink to that post - I dont want to violate any stackoverflow/superuser violations) Suggestions on merging them are welcome or if I should delete one? StackOverFlow Question

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  • Fedora 9 not reconizing hard drive

    - by Andrew Jones
    I am installing Fedora 9 to a PC (specifications at the bottom) and have had a lot of trouble with it recognising the hard drive. To get the Fedora installer to recognize it in the first place I had to pass "ata_generic.all_generic_ide=1 pci=nomsi" to the kernel, after which it installed OK. However, now when I boot the installed OS, I get a "could not find filesystem '/dev/root'" error. I tried passing the same arguments to the kernel at boot as I did when installing but to no avail. I have tried using the default LVM layout and defining manual ones but it made no difference. There is no option in the BIOS to enable AHCI or anything like that, in fact the BIOS is very limited in most respects. I can get into the system by using the installation CD in rescue mode (with those extra kernal parameters) but I'm not sure what to do once in there... Unfortunately using a more recent version of Fedora or even another Linux distribution altogether isn't an option becuase of outside constraints - which is annoying since I know for a fact Ubuntu works fine on this setup. I have not been using Linux that long, so treat me like an idiot - I am one. Any help would be greatly appreciated, thanks! System spec: Intel Atom Z530 CPU @ 1.6 GHz Intel US15W chipset 1 GB DDR2 160 GB SATA harddisk (Samsung HM16HI) 1000 Mbit/s Ethernet port Phoenix BIOS

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  • Using 1920x1200 mode on SyncMaster T260HD in Linux

    - by dagorym
    I just got a Samsung SyncMaster T260HD monitor. It works straight out of the box with Windows but I can't seem to get it to work with Linux, which is my primary OS for day to day work. The computer boots up but when going into graphical mode on Linux the monitor gives me a "Mode not supported" error and doesn't display anything. I booted up windows and, using PowerStrip, grabbed the exact ModeLine that should be used to get the equivalent setting in Linux and added it to my xorg config file but it doesn't seem to help. the ModeLine is: ModeLine "1920x1200" 153.9 1920 1984 2016 2080 1200 1203 1209 1235 +hsync -vsync This is the modeline for the working display settings in windows but it doesn't seem to work in Linux My complete entry in the xorg.conf file for the monitor is Section "Monitor" Identifier "Monitor0" ModelName "SyncMaster" DisplaySize 518 324 HorizSync 30.0 - 81.0 VertRefresh 56.0 - 75.0 Option "dpms" ModeLine "1920x1200" 153.9 1920 1984 2016 2080 1200 1203 1209 1235 +hsync -vsync EndSection I'm running Scientific Linux 5.4 (clone of Redhat Enterprise Linux 5.4) but I've tried booting with a recent Linux Mint Distro as well as Ubuntu 9.04 and had the same problem. Any suggestions on other things I should try or might be missing? If anyone's gotten this to work I'd love to know. Thanks.

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  • RRAS NAT not working on a certain computer

    - by legenden
    This is driving me crazy. I have a virtualized W2K8 server running RRAS. Every other computer or server on the network can access the internet through the NAT except one. On one server, it just won't work. I can ping the ip address of the NAT gateway just fine, and everything else works. (SMB, etc) DNS, which is hosted by the same server, also works just fine. I have even reinstalled the OS on the problem server and it still doesn't work. Recap of the steps I tried: There are 3 network cards in the server, I tried every one and different switch ports. Not a hardware problem. Reinstalled W2K8 R2 on server with the problem, didn't help. Tried the IP of the internet gateway directly - this did work (!). But I need NAT to work. All firewalls are disabled. Removed computer from domain, deleted computer membership in Active Directory Users and Computers and added it back. Disabled all other network adapters and set a static ip and specified the gateway ip manually. When I tracert a public IP, the first hop (or any other hop) comes up as: C:\>tracert www.google.com Tracing route to www.l.google.com [209.85.225.106] over a maximum of 30 hops: 1 * * * Request timed out. 2 * * * Request timed out. From a different computer, on which NAT works, the first hop comes up as: tracert www.google.com Tracing route to www.l.google.com [209.85.225.105] over a maximum of 30 hops: 1 <1 ms * <1 ms xxxx [10.5.1.1] This is the most bizarre problem I ever came across, and I realize that it's a long shot asking it here given all the details, but I'm pulling my hair out. Maybe someone has an idea...

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  • Enabling Samba Shares Across Subnets

    - by John
    I was curious how I could go about setting up SAMBA so that shares could be seen and used across different subnets. We have some Linux devices that are bound to Active Directory and we would like to have them serve SAMBA shares to clients that will reside in a different subnet than what the servers reside in? Is there any way to do this without needing to setup a WINS server or use legacy NetBIOS methods since the majority of our clients are Windows 7, Windows Server 2003, Windows Server 2008, and Macintosh OS X (10.6 or newer)? EDIT Right now, only clients in the same subnet as the SAMBA server can see the shares. Clients outside of the subnet (i.e. the client subnet) cannot see or connect to the share. The error returned is: The specified network name is no longer available. It does not seem to matter if I use IP, FQDN, or NetBIOS name to try and connect to the share with. We have a common Cisco router handling the inter-subnet routing. Everything else seems to work correctly with this network setup and the device can be pinged from multiple subnets. I also do not believe it to be a firewall type of issue since the rules for this segment are rather lax.

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  • Idle state detection for server

    - by odinmillion
    Windows OS has a service that detects idle state. Details: Task Idle Conditions The computer is considered idle if all the processors and all the disks were idle for more than 90% of the past 15 minutes and if there is no keyboard or mouse input during this period of time. When the Task Scheduler service detects that the computer is idle, the service only waits for user input to mark the end of the idle state. It is very useful for usual PCs that have keyboard amd mouse. We can use standard task scheduler to start some process like defrag when PC in idle state and stop when PC isn't in idle state. But what should we use when we using a standalone server without keyboard and mouse? Server sometimes receives commands by TCP/IP and starts CPU and HDD activity. But sometimes CPU and HDD activity at zero level. I would like to use this periods of time to start defrag or another process. But this started at "idle" state processes should be terminated when another commands will appear. So, standard idle state conditions cant help me because we have not got user input to stop idle state. I need more customizable idle state detector. Automatically started processes shouldn't influence to idle state, but PC should go away from idle state when another process will apperar. What should I use? Maybe exists some advansed task scheduler? Or I should write some useful utility on C#? I hope that it is a standard task and all useful utilities already compiled :)

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  • CouchDB crashes at startup when path to config file has space(s)

    - by Barry Wark
    I'm hoping to run CouchDB as a per-user Launch Agent on OS X. I'm using the coucdbx-core folder from the CouchDB Server.app as the base of my CouchDB deployment. I'd like each user to have their own couch instance (on a different port), necessitating separate config files for each instance. The logical place to put these files is in ~/Library/Application Support/ for each user. I can put the entire distribution in ~/Library/Application Support/my-app/coucdbx, and put the .ini at ~/Library/Application Support/my-app/local.ini. Starting couchdb as bin/couchdb -a ../local.ini (from ~/Library/Application Support/my-app/coucdbx) works great. But I'd like to save every user the ~50MB couchdbx and install the couchdbx-core in a shared location (e.g. within my app's .app bundle). When I do this, the path to the per-user config file contains a space, and I get the following error when starting CouchDB: $ bin/couchdb -n -a ~/Library/Application\ Support/us.physion.ovation/default.ini {"init terminating in do_boot",{{badmatch,{error,{bad_return,{{couch_app,start,[normal,["/Users/hs/prj/build-couchdb/build/etc/couchdb/default.ini","/Users/hs/prj/build-couchdb/build/etc/couchdb/local.ini"]]},{'EXIT',{{badmatch,{error,{error,enoent}}},[{couch_server_sup,start_server,1,[{file,"/Users/hs/prj/build-couchdb/dependencies/couchdb/src/couchdb/couch_server_sup.erl"},{line,56}]},{application_master,start_it_old,4,[{file,"application_master.erl"},{line,274}]}]}}}}}},[{couch,start,0,[{file,"/Users/hs/prj/build-couchdb/dependencies/couchdb/src/couchdb/couch.erl"},{line,18}]},{init,start_it,1,[]},{init,start_em,1,[]}]}} Is there any way to provide a config file at the command line, if that config file's path includes space(s)? Despite my best efforts in the mailing list archives, wiki and google, I haven't been able to find a solution or a definitive "it can't work". Any help greatly appreciated.

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  • How to install QEMU on Damn Small Linux?

    - by user2934303
    i'm trying to install QEMU on a Damn Small Linux installation in order to emulate pentium features in a 486 computer. Though DSL was descontinued, it's the only linux that runs reasonably on the 486 processor, most recent kernels doesn't even boot on 486 architecture. I tried Tiny Core Linux, but it doesn't work in 486, so i seem to have no escape here. The most recent image of DSL is from 2008, it uses kernel 2.4.x, and i couldn't find a way to compile QEMU on it. Firstly, it lacks several compile tools needed for compiling it, and, it have several dependency problems. I tried some pre-compiled packages, but the only one that worked was a QEMU 5.2 RPM package (it didn't had dependency problems), and it was way too old, it wasn't capable of running windows yet, it just gave me the option of emulating a code, not a full OS as windows, and it also didn't give me the option to choose which architecture i wanted it to emulate (-cpu option). Can anyone help me with this? Also, if someone can think of some alternative to it, i'd be grateful. Thanks.

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  • nf_conntrack complaints in dmesg

    - by Alexander Gladysh
    While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server: [11458852.811070] net_ratelimit: 321 callbacks suppressed [11458852.811075] nf_conntrack: table full, dropping packet. [11458852.819957] nf_conntrack: table full, dropping packet. [11458852.821083] nf_conntrack: table full, dropping packet. [11458852.822195] nf_conntrack: table full, dropping packet. [11458852.824987] nf_conntrack: table full, dropping packet. [11458852.825298] nf_conntrack: table full, dropping packet. [11458852.825891] nf_conntrack: table full, dropping packet. [11458852.826225] nf_conntrack: table full, dropping packet. [11458852.826234] nf_conntrack: table full, dropping packet. [11458852.826814] nf_conntrack: table full, dropping packet. Complains are repeated every five seconds (number of suppressed callbacks is different each time). What can these sympthoms mean? Is that bad? Any hints? (Note that the question is more narrow than "how to solve specific case of bad HTTP server performance", so I do not give more details on that.) Additional info: $ uname -a Linux MYHOST 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise $ cat /proc/sys/net/netfilter/nf_conntrack_max 1548576 The server is under about 10M hits / day load.

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  • Apache2 with lighttpd as proxy

    - by andrzejp
    Hi, I am using apache2 as web server. I would like to help him lighttpd as a proxy for static content. Unfortunately I can not well set up lighttpd and apache2. (OS: Debian) Important things from lighttpd.config: server.modules = ( "mod_access", "mod_alias", "mod_accesslog", "mod_proxy", "mod_status", ) server.document-root = "/www/" server.port = 82 server.bind = "localhost" $HTTP["remoteip"] =~ "127.0.0.1" { alias.url += ( "/doc/" => "/usr/share/doc/", "/images/" => "/usr/share/images/" ) $HTTP["url"] =~ "^/doc/|^/images/" { dir-listing.activate = "enable" } } I would like to use lighttpd in only one site operating as a virtual directory on apache2. Configuration of this virtual directory: ProxyRequests Off ProxyPreserveHost On ProxyPass /images http://0.0.0.0:82/ ProxyPass /imagehosting http://0.0.0.0:82/ ProxyPass /pictures http://0.0.0.0:82/ ProxyPassReverse / http://0.0.0.0:82/ ServerName MY_VALUES ServerAlias www.MY_VALUES UseCanonicalName Off DocumentRoot /www/MYAPP/forum <Directory "/www/MYAPP/forum"> DirectoryIndex index.htm index.php AllowOverride None ... As you can see (or not;)) my service is physically located at the path: / www / myapp / forum and I would like to support lighttpd dealt with folders: / www / myapp / forum / images / www / myapp / forum / imagehosting / www / myapp / forum / pictures and left the rest (PHP scripts) for apache After running lighttpd and apache2 working party, but did not show up any images of these locations. What is wrong?

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  • Remote server security: handling compiler tools

    - by Gonzolas
    Hello! I was wondering wether to remove compiler tools (gcc, make, ...) from a remote production server, mainly for security purposes. Background: The server runs a web application on Linux. Consider Apache jailed. Otherwise, only OpenSSHd faces the public network. Of course there is no compiler stuff within the jail, so this is about the actual OS outside of any jails. Here's my personal PRO/CON list (regarding removal) so far: PRO: I had been reading some suggestions to remove compiler tools in order inhibit custom building of trojans etc. from within the host if an attacker attains unpriviliged user permissions. CON: I can't live without Perl/Python and a trojan/whatever could be written in a scripting language like that, anyway, so why bother about removing gcc et al. at all. There is a need to build new Linux kernels as well as some security tools from source directly on the server, because the server runs in 64-bits mode and (to my understanding) I can't (cross-)compile locally/elsewhere due to lack of another 64-bits hardware system. OK, so here are my questions for you: (a) Is my PRO/CON assessment correct? (b) Do you know of other PROs / CONs to removing all compiler tools? Do they weigh in more? (c) Which binaries should I consider dangerous if the given PRO statement holds? Only gcc, or also make, or what else? Should I remove the enitre software packages them come with? (d) Is it OK to just move those binaries to a root-only accessible directory when they are not needed? Or is there a gain in security if I "scp them in" every time? Thank you!

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  • Failed to start apache Can't open /etc/apache2/envvars

    - by bumperbox
    i have had this problem a couple of times now and i am not sure what is causing it Failed to start apache : .: 45: Can't open /etc/apache2/envvars when i look at a dir listing, i get these question marks next to envvars, does anyone know what that means? os is ubuntu 10 if that helps drwxr-xr-x 7 root root 4096 Jan 29 11:56 . drwxr-xr-x 83 root root 4096 Feb 4 10:34 .. -rw-r--r-- 1 root root 8113 Sep 29 01:52 apache2.conf -rw-r--r-- 1 root root 8027 Oct 3 22:26 apache2.conf.dpkg-old drwxr-xr-x 2 root root 4096 Jan 29 11:56 conf.d ?????????? ? ? ? ? ? envvars -rw-r--r-- 1 root root 0 Oct 3 22:25 httpd.conf ?????????? ? ? ? ? ? magic drwxr-xr-x 2 root root 4096 Jan 29 11:56 mods-available drwxr-xr-x 2 root root 4096 Jan 29 10:18 mods-enabled ?????????? ? ? ? ? ? ports.conf drwxr-xr-x 2 root root 4096 Jan 29 11:56 sites-available drwxr-xr-x 2 root root 4096 Jan 29 11:55 sites-enabled UPDATE Just heard back from the hosting company, they move my VPS to a new hardware node last night, and something at their end wasn't quite right which caused the issue

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  • Remote desktop solution where the desktop sharing party contacts the computer it wants to share with

    - by Kent
    I'm in a situation where I act as a sort of techinical support to my family and less techinically experienced friends. I'm looking for a remote desktop solution where it's possible to setup a "zero-install, double click an icon"-solution where the client computer contacts me so that I may interact with their desktop. The last part is important as the people in need of my help don't know how to configure their router or even the firewall software on their own computer. They are able to click an accept button when asked if a program should be able to make outgoing connections. They have many different kinds of routers, as well as software firewalls, and I rather not deal with the problem of how to connect to them using whatever as well as the actual problem they are having. It must be: Free of charge for non-commercial use. Possible to use it in a mode where the computer wanting to share its desktop should be able to make a connection to my computer. My computer has a DNS name we can use. Compatible with both Windows XP and Windows 7. Independent of a third party server or infrastructure. Explanations of the above: I don't want to spend money on it when I help them for free. If it's free as in freedom, all the better! I guess this boils down to being callable like showdesktopto.exe opscomputer.com where opscomputer.com is my computers DNS name. If that is possible then I can create a shortcut they can use to connect to me when they need help. It's nice if it's possible to specify a password or key file which I can use to authenticate myself, but it's not required. They use the OS which their machine comes installed with. That means Windows XP or 7. I want something which will work in the long run. Using a third party service which might not be available when I need it disqualified such solutions.

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  • LogMeIn Hamachi for Linux

    - by tlunter
    So far most of my work using LogMeIn Hamachi has been from either a Mac OS X or Windows system to Windows or a Linux Computer. Recently I purchased a mini computer and have been running Ubuntu Server on it, as my little server. I knew LogMeIn had a Linux client that is command line only, but I often do all my work via command line anyway, so that wasn't an issue. I added my user to the correct local file so that I could run the hamachi daemon without sudo, and was able to connect to LogMeIn's service. I decided to set up my Linux server as a git server as well, and set it up correctly. The thing is, the server is behind my schools firewall and I need to use hamachi to get around that. Since most of the time I was using either Mac or Windows, I never had an issue sshing onto any of my computers since LogMeIn is fully featured for these OSs. From Linux (Arch) though, it seems like the client cannot correctly route to the LogMeIn IPs. I know from Windows I can connect to the Linux computers, both of them. From Linux (Arch) though, I can't connect to my Mac, Windows, or Linux server. It keeps just dropping the connection. I was wondering if there was some configuration that I would need to make for this to work. I understand that it is most likely going to be a static configuration since I assume it has to do with the computer not understanding that 5.*.*.* actually refers to another IP:Port. Has anyone had any experience getting this to work?

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  • How to prevent nginx from locking files on mounted samba partition in Centos 6

    - by Bruce Kirkpatrick
    I'm using nginx 1.3.8 inside a centos 6.3 virtualbox 4.2.4 virtual machine. The system is running the latest software available via yum update. The host OS is windows 7. The site files nginx is serving are on mounted samba partition, which is a folder on the host Windows system. I.e., inside linux, nginx paths are referring to /home/vhosts and this is mounted from D:\vhosts\ on windows. The samba partition is mounted as root with 777 privileges. /etc/fstab looks like this, but with real ip, username, password: //hostip/vhosts /home/vhosts cifs username=username,password=SECRETPASSWORD,uid=root,gid=root,file_mode=0777,dir_mode=0777,rw,_netdev 0 0 I.e. linux/nginx reads from the windows share, and not the opposite. in /etc/samba/smb.conf, I have tried to disable all samba locking features, but it seems to have no effect even after rebooting the virtual machine. locking=no share modes=no oplocks = no level2 oplocks = no kernel oplocks =no I'm receiving "Access is denied" errors in Windows or linux when attempting to overwrite the javascript file in windows that has been accessed at least once with nginx. If I run "service nginx reload", the lock is removed and I'm able to save the file. That's why I think it is nginx causing the lock. The same problem occurs with directories. However, that may be a different issue not related to the use of samba. I'm using samba so that I can manage the source code outside of the virtual machine. Also note that after I run "service nginx reload", the file I'm editing is actually automatically deleted from the windows host. SOLVED: I just reviewed my nginx.conf file. It appears the "open_file_cache" feature is what is causing the lock and deleted files. When I set this option to open_file_cache off;, My problem is resolved. I will repost as the answer when it allows me to do so.

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  • To update or to not update?

    - by Massimo
    Since starting working where I am working now, I've been in an endless struggle with my boss and coworkers in regard to updating systems. I of course totally agree that any update (be it firmware, O.S. or application) should not be applied carelessly as soon as it comes out, but I also firmly believe that there should be at least some reason if the vendor released it; and the most common reason is usually fixing some bug... which maybe you're not experiencing now, but you could be experiencing soon if you don't keep up with . This is especially true for security fixes; as an examle, had anyone simply applied a patch that had already been available for months, the infamous SQL Slammer worm would have been harmless. I'm all for testing and evaluating updates before deployng them; but I strongly disagree with the "if it's not broken then don't touch it" approach to systems management, and it genuinely hurts me when I find production Windows 2003 SP1 or ESX 3.5 Update 2 systems, and the only answer I can get is "it's working, we don't want to break it". What do you think about this? What is your policy? And what is your company policy, if it doesn't match your own?

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  • fail2ban log parsing too slow on Raspberry Pi - options? [migrated]

    - by Gordon Morehouse
    I'm running fail2ban on a Raspberry Pi at 950MHz which I cannot overclock further. The Pi is occasionally subject to SYN floods on particular ports. I've set up iptables to throttle the rate of SYNs on the port of interest; when the throttle limits are exceeded, hosts which send SYNs are dropped into the REJECT chain and the particular SYN packet which exceeded the limit is logged. fail2ban then watches for these logged SYNs and, after seeing a few, temporarily bans the host for a short time (this is a transient issue in the app I'm working with). The problem is that the SYN floods can occasionally reach rates which are too fast for fail2ban to keep up with; I'll see 20-40 log messages per second, and eventually fail2ban falls behind and becomes ineffective. To add insult to injury, it continues consuming a LOT of CPU as it tries to catch up. I have verified that DROP chained packets from hosts already banned by fail2ban are not logged, and thus do not add to its load. What are my options here? I have a few ideas, but no clear path forward. Could I make the log-parse regex "easier" so it takes fewer cycles? Would using iptables --log-prefix to put a token near the start of the log message, and/or otherwise simplifying/altering the fail2ban regex help? Here is the current fail2ban config line containing a regex: failregex = kernel:.*?SRC=(?:::f{4,6}:)?(?P<host>[\w\-.^_]+) DST.*?SYN Is there a faster way for fail2ban to watch for the packets exceeding the limits than parsing kern.log? Could fail2ban be run under PyPy instead of CPython with minimal nonstandard wizardry (the OS is Raspbian 7, so, mostly Debian 7)? Is there something better than fail2ban that I could use to watch for the packets which exceed the SYN limits, and after N exceeds in X seconds, temporarily put the offending IP into the iptables DROP bucket, and take it out when the ban timer expires? Again, I'd vastly prefer a solution that uses as much software available in Debian as possible, though I can build Debian packages in a pinch.

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  • Is it the address bus size or the data bus size that determines "8-bit , 16-bit ,32-bit ,64-bit " systems?

    - by learner
    My simple understanding is as follows. Memory (RAM) is composed of bits, groups of 8 which form bytes, each of which can be addressed ,and hence byte addressable memory. Address Bus stores the location of a byte of memory. If an address bus is of size 32 bits, that means it can hold upto 232 numbers and it hence can refer upto 232 bytes of memory = 4GB of memory and any memory greater than that is useless. Data bus is used to send the value to be written to/read off the memory. If I have a data bus of size 32 bits, it means a maximum of 4 bytes can be written to/read off the memory at a time. I find no relation between this size and the maximum memory size possible. But I read here that: Even though most systems are byte-addressable, it makes sense for the processor to move as much data around as possible. This is done by the data bus, and the size of the data bus is where the names 8-bit system, 16-bit system, 32-bit system, 64-bit system, etc.. come from. When the data bus is 8 bits wide, it can transfer 8 bits in a single memory operation. When the data bus is 32 bits wide (as is most common at the time of writing), at most, 32 bits can be moved in a single memory operation. This says that the size of the data bus is what gives an OS the name, 8bit, 16bit and so on. What is wrong with my understanding?

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  • Poor gaming performance with hyper-v installed in windows 8

    - by SnowCrash
    I am getting very poor gaming performance on my Windows 8 host OS with Hyper-V installed but no guest machines running. For example World of Tanks reports 60-70 FPS without Hyper-V installed and 4-14 FPS with it installed. A similar, dramatic, hit is observed in several other games so the issue is not WoT specific. To make the point clear, I am not trying to run games in a virtual machine. I don't even have a VM running while observing this effect. I simply have the Hyper-V feature installed. My system specs: AMD Phenom II 965 (3.4 GHz) AMD Radeon 6950 2GB (XFX Double D HD-695X-CDFC) 16GB DDR3 1333 AMD 790GX chipset Mainboard (Gigabyte GA-MA790GPT-UD3H) I have tried every AMD driver from 12.8 to the current 12.11beta8, virtualization is enabled in the BIOS settings, the onboard 3300HD video device is disabled in BIOS and I have read the MSDN blog entry here regarding a similar issue in Server 2008 that was resolved in 2008 R2 (and hopefully not regressed in Win 8). I'd like to be able to use Hyper-V for development and testing at home (I am a sysadmin/software developer professionally). If, however, I can't also use my home system for entertainment I'll have to scrap those plans.

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  • Flash alternative for iBook Mac?

    - by Hunter Dolan
    I have a old Apple iBook G4 that I decided to hook up to my main TV. I like the setup because I can surf the internet on my TV now. The only thing that I can't seem to do is watch Flash videos. Apparently Flash Player 10 doesn't play nice with the iBook's graphics card's GPU, leaving all the graphics processing to the CPU which is a disaster. Others suggested downgrading to Flash Player 9, I did that, and youtube worked fine, but Hulu (The main reason I wanted to hook it up to the TV in the first place) did not. Anyone know of a Flash alternative or a Flash 10 fix for the iBook? Or even a Hulu client that doesn't require Flash. Here are my iBook's Specs Model Name: iBook G4 <br> Model Identifier: PowerBook6,5 <br> Processor Name: PowerPC G4 (1.2) <br> Processor Speed: 1.2 GHz <br> Number Of CPUs: 1 <br> L2 Cache (per CPU): 512 KB <br> Memory: 512 MB <br> Bus Speed: 133 MHz <br> Boot ROM Version: 4.8.7f1 <br> Mac OS X Version: 10.5.8 <br> PS: Don't tell me that I need to buy a new computer. I know that I would have better results with a new computer but I don't want to buy a new computer just for Hulu.

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  • gallery2 and nginx with rewrite return file not found for file name with space (or + sign in url)

    - by Vangel
    I have setup nginx with gallery2 on an internal server. Everything works fine under apache2 which I checked first, it used to be on apache2 Problem is: gallery2 seems to generate url with + sign in it for file names/ images which had spaces in it so a file like "may report.jpg" becomes "may+report.jpg" The URL rewrite works but gallery2 throws an error for file not found. THis does not happen under apache2. Here is my nginx rewrite rule: location / { index main.php index.html; default_type text/html; # If the file exists as a static file serve it # directly without running all # the other rewite tests on it if (-f $request_filename) { break; } } location /v/ { # if ($request_uri !~ /main.php) # { rewrite ^/v/(.*)$ /main.php?g2_view=core.ShowItem&g2_path=$1 last; # } } location /d/ { if ($request_uri !~ /main.php) { rewrite ^/d/([0-9]+)-([0-9]+)/(.*)$ /main.php?g2_view=core.DownloadItem&g2_itemId=$1&g2_serialNumber=$2&g2_fileName=$3 last; } } location ~ \.php$ { fastcgi_pass 127.0.0.1:8889; fastcgi_index main.php; fastcgi_intercept_errors on; # to support 404s for PHP files not found fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; fastcgi_param SERVER_NAME $host; fastcgi_read_timeout 300; } the sit on its own works fine. only the images with spaces in file name do not display in album view and also when clicking the the image for full page view will throw this error Error (ERROR_MISSING_OBJECT) : Parent 103759 path report+april+456.flv in modules/core/classes/helpers/GalleryFileSystemEntityHelper_simple.class at line 98 (GalleryCoreApi::error) in modules/core/classes/GalleryCoreApi.class at line 1853 (GalleryFileSystemEntityHelper_simple::fetchChildIdByPathComponent) in modules/core/classes/helpers/GalleryFileSystemEntityHelper_simple.class at line 53 (GalleryCoreApi::fetchChildIdByPathComponent) in modules/core/classes/GalleryCoreApi.class at line 1804 (GalleryFileSystemEntityHelper_simple::fetchItemIdByPath) in modules/rewrite/classes/RewriteSimpleHelper.class at line 45 (GalleryCoreApi::fetchItemIdByPath) in ??? at line 0 (RewriteSimpleHelper::loadItemIdFromPath) in modules/rewrite/classes/RewriteUrlGenerator.class at line 103 in modules/rewrite/classes/parsers/modrewrite/ModRewriteUrlGenerator.class at line 37 (RewriteUrlGenerator::_onLoad) in init.inc at line 147 (ModRewriteUrlGenerator::initNavigation) in main.php at line 180 in main.php at line 94 in main.php at line 83 System Information Gallery version 2.2.4 PHP version 5.3.6 fpm-fcgi Webserver nginx/0.8.55 Database mysqli 5.0.95 Toolkits ImageMagick, Thumbnail, Gd Operating system Linux CentOS-55-64-minimal 2.6.18-274.18.1.el5 #1 SMP Thu Feb 9 12:45:44 EST 2012 x86_64 Browser Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.52 Safari/536.5 In the report above there is usable system information if that helps. I know the nginx is old but it comes as default in centos repo and I am not sure if upgrading will fix the problem or break something else it seems gallery2 must map the + to space internally but why it's not doing so with nginx I can't tell. EDIT: I just verified that if I change the '+' sign to %20 then gallery2 works. but gallery2 is generating URL as +. I found a (maybe) related problem here for IIS7 and Gallery2 http://forums.asp.net/t/1431951.aspx EDIT2: Accessing the URL without rewrite and having the + sign works. Must be something to do with rewrite. Here is the relevant apache2 rule that might be of help RewriteCond %{THE_REQUEST} /d/([0-9]+)-([0-9]+)/([^/?]+)(\?.|\ .) RewriteCond %{REQUEST_URI} !/main\.php$ RewriteRule . /main.php?g2_view=core.DownloadItem&g2_itemId=%1&g2_serialNumber=%2&g2_fileName=%3 [QSA,L] RewriteCond %{THE_REQUEST} /v/([^?]+)(\?.|\ .) RewriteCond %{REQUEST_URI} !/main\.php$ RewriteRule . /main.php?g2_path=%1 [QSA,L]

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  • Handheld Linux device can't see one wireless network

    - by Nathan
    I'm using a Nokia N810 running OS 2008 (version 5.2008.43-7; should be the latest). It can see networks up and down the street in my neighborhood and can connect to mine using WEP. I can also connect to free networks at restaurants and the like. When I bring it into work, it can't see a wireless network ("No connections available"). When I use netstumbler on my laptop I can see a list of several essids showing green connectivity for the network. I know that the network has its essid broadcast, and I know that it's unsecured. When I run iwlist wlan0 scan, I see several APs with no essid, but I don't see anything with an essid set. I have verified using iwlist that my hardware supports the correct channels and speeds. I know this isn't a Nokia/mobile forum, but it's running what's basically a Debian kernel. Any suggestions on what to do in this case? I'm really frustrated by this. Thanks, Nathan

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  • How can I fix Office Sharepoint Search service?

    - by unknown (yahoo)
    For some reason, in operations server services, Office Sharepoint Search Service is MISSING! Which means I cant get Shared services working, which in turn I cannot get, and I do not think I have ever got Usage and reporting to see who is visiting my website, counter and with what OS/ browser ETC. I dont think I have ever seen this work in the 2 years trying with sharepoint. So in essense I have two problems, most important SEARCH, second usage reports. When trying to search, all i get is unknown error. Nothing is in my event viewer at all. I have tried http://www.cjvandyk.com/blog/Lists/Posts/Post.aspx?ID=96 , in the comments on that site, on other person reports search is missing entirely and is going to uninstall. Im tired of uninstall sharepoint and resinstalling to fix an odd off issue. I have things setup with Team foundation server that took forever to get work and reinstallation is not my solution. As for usage reporting, this is what microsoft responds to the " Both Windows SharePoint Services Usage logging and Office SharePoint Usage Processing must be enabled to view usage reports. Please contact your administrator to ensure that these services are enabled. " error I cannot do all the steps since SSP needs to be setup which i cant above.

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