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• Synergy on macbook with osx mavericks wifi connection

  - by user332956

  I'm trying to set up Synergy with my macbook pro running OS X 10.9.3 as a client and my Windows 7 desktop as a server. I'm having some pretty bad connection problems though when I try to use my mac. Every couple seconds the mouse or the keyboard will stop working entirely then come back. I ran some tests and found that the ping from my desktop to my mac would be very high every third ping or so(1000+ ms) or sometimes even time out. If I ping my desktop from my mac the pings are all reasonably low. I believe that this is a power saving feature of Mavericks and I have found a way to get around it by continually pinging my router on my mac, keeping my wifi card from going to sleep. I'm using this right now to type this up with synergy and have had zero issues. Has anyone else ran into this issue and found a better solution? So far, I think my best bet would be to buy an ethernet adapter but I'd rather not have yet another cable running across my desk.

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• Change XRDP keyboard layout to en-gb Ubuntu 12.04

  - by Earl Sven

  Does anybody know how to change the keyboard layout to en-gb in an XRDP session on Ubuntu 12.04? I am using mstsc.exe to connect to an XRDP server hosting an XVNC session, however I cannot work out how to apply the UK keyboard layout. A bit of googling has yeilded these instructions which allow me to change the keymap, however using the keymap file I downloaded from here I loose the ability to use the arrow keys, home/end etc. Comparing the file with the standard one there are substantially more differences than I would expect considering the similarity between the layouts. I only have RDP access to the box so i don't seem to be able to actually generate a new layout per the instructions above, maybe it's a local console thing? Also I can't change either the RDP client used or the RDP server as they are my only access to the system, I don't have local console access. I do have root priveleges on the OS however. Any thoughts? Edit: I have found http:// xrdp.sourceforge.net/documents/keymap/newkeymap.html (apologies for not typing the link properly but the antispam filter won't let me post more than 2 links) this documentation on the XRDP sourceforge page which describes keymap file format. It indicates the values in the keymap files are unicode 0x64 etc, however the files I have already on my system seem to use a different format 0:0 or 65307:27 etc, does anybody know what the difference is?

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• Networking 2 Virtual PC with one VPC as DHCP server

  - by vivek

  My host OS is Win XP Professional. The host has a real network connection via DSL and I created a second network connection using Microsoft Loopback Adapter. Internet connection sharing is enabled. The Microsoft Loopback adapter has a IP address of 192.168.0.1. I have 1 Virtual PC which has Windows Server 2003. I have setup the network connection on this VPC to use Microsoft Loopback Adapter. I setup this VPC to be the Domain Controller , DNS Server and DHCP Server. I set this to a static IP address 192.168.0.2 (on the same subnet as the MS Loopback adapter) I have a second Virtual PC which also has Windows Server 2003. The network connection on this VPC is set to "Local Only". I want this VPC to get its IP address from the 1st VPC on which I setup as a DHCP server. What i want is the 2 VPC should be in a network with one of the VPC acting as the domain controller, DNS Server and DHCP server. The second VPC shoud get its IP address from the 1st VPC. It should be a part of the domain of the 1st VPC. When i tried to make the second VPC get the IP address from the first VPC I am not succeeding. Can somebody post some suggestions on how to go about this ?

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• Sendmail in Nexenta core 3.0.1

  - by maximdim

  I'm trying to setup sendmail in Nexenta core 3.0.1 (Solaris based OS). All I want is to be able to send emails from that host - like notifications about failures, cron jobs output etc. Initially Nexenta core doesn't have sendmail so here is what I've done: apt-get install sunwsndmu Now there is a sendmail in /usr/sbin/sendmail. When I try to send email from command line: $mail maxim test . It doesn't give me any error but in log file I see: Dec 20 12:41:08 nas sendmail[12295]: [ID 801593 mail.info] oBKHf8u7012295: from=maxim, size=107, class=0, nrcpts=1, msgid=<201012201741.oBKHf8u7012295@nas>, relay=maxim@localhost Dec 20 12:41:08 nas sendmail[12295]: [ID 801593 mail.info] oBKHf8u7012295: to=maxim, ctladdr=maxim (1000/10), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30107, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1] So I guess I need to have SMTP service running. How do I do that in Nexenta? svcs -a | grep sendmail doesn't return anything and # svcadm enable sendmail svcadm: Pattern 'sendmail' doesn't match any instances I'm not married to sendmail so if there are easier ways to achieve y goal I'm open to suggestions as well. Thanks,

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• SSH from mac to linux -> start gnome-session -> X11 keyboard mapping all messed up.

  - by Justin

  I have 2 computers: echo.local is running Ubuntu 9.04. justin.local is running Mac OS 10.6.1. X11 version on the mac is 2.3.4. I open X11 on the mac, and open a new xterm window (Applications Menu - Terminal), everything is fine. Keyboard works as expected. I do ssh -X echo.local from the mac (connecting to the linux box), and from the linux command prompt, start xterm - everything is fine. Keyboard works as expected. I do gnome-session from the linux command prompt (through SSH), gnome launches, but keyboard mapping is ALL types of screwed up. If I kill gnome-session and open an xterm via ssh, keyboard mapping is still screwed up. If I then kill the SSH session entirely, and do X11 - Applications Menu - Terminal, opening a brand new xterm window on the mac with no SSH session running at all ... keyboard mapping is still screwed up. Only after I quit X11 and relaunch, is the keyboard mapping back to normal. Keyboard layout under GNOME is Apple-MacBook/MacBook Pro.

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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