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• ^C not working in zsh on Mac OSX

  - by Vitaly Kushner

  Ctrl-C stopped working for me at the terminal when using zsh (on mac osx). I didn't notice the exact moment that it happend so I can't be sure what caused it. I didd't update zsh in a while though. and didn't touch .zshrc (I have it at a repo http://github.com/astrails/dotzsh) If I run bash, ^C works in it. If I run any command, like cat, ^C will work to stop it too. but inside zsh it just doesn't do anything. bindkey | grep \\^C gives "^B"-"^C" self-insert zsh 4.3.10 (i386-apple-darwin10.4.3), installed though ports (zsh-devel @4.3.10_0+doc+examples+mp_completion+pcre) mac os 10.6.6

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• Forwarding port 3306 on Mac OS X in order to connect to a remote MySQL Database

  - by Jonathan Mayhak

  I'm on Mac OS X 10.6.2 trying to connect to ubuntu server 8.04.1 at linode. ssh -L 127.0.0.1:3306:[[remote ip]]:3306 user@server -N I want to set up ssh tunneling so that I can access a remote mysql server. First of all, I'm told bind: Address already in use. This is only after I've tried the command before. How do I manually close a port forwarding session? Second, when I change the command to be ssh -L 127.0.0.1:3310:[[remote ip]]:3306 user@server -N (I changed the local port to listen on). I'm told channel 1: open failed: connect failed: Connection refused when I try to connect to the MySQL server via MySQL workbench or sequel pro. To connect through MySQL workbench I use the following settings: host: 127.0.0.1 port: 3310 (if 3306 is in use) username: mysql username password: mysql password database: I don't put anything in

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• DNS PTR record when domain on shared IP address

  - by Marco Demaio

  Hello, I own a typical shared IP hosting plan and domain. I can modify the DNS of the domain from the control panel. The mailserver shares the same IP address, so my typical DNS config is: www.mydomain.com A -> IP mydomain.com A -> IP ftp.mydomain.com A -> IP mail.mydomain.com A -> IP mydomain.com MX(10) -> IP I read some Q&A on this site where they suggest to add PTR record mainly for mailserver. I would like to add PTR record to my domain, I have got two questions: 1) can PTR record be added even if the hosting/mailserver are on a shared IP address? Or do I need a dedicated IP. 2) How do I setup PTR record, I mean does it look like A record: mydomain.com (PTR) -> myip

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• Changing aspect ratio of Virtualbox VM under OSX

  - by Sambo

  I have a Windows guest on an OSX host, running at 1024x768. I want to use scale-mode to make the window small enough to have on the side of my screen, but the problem is that since I maximised the VM in scale mode earlier, the aspect ratio is now nearer my 16:10. I've tried resizing in only one dimension, disabling and re-enabling scale mode and also reinstalling guest additions. A search of the Virtualbox docs does tell me that maintaining aspect ratio is doable under OSX, but it doesn't say how. I'd really like to be able to fix this without reinstalling my VM if possible. I'm running Virtualbox 4.2.16 r86992 under OSX 10.8.4 with a Window 7 guest.

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• zip being too nice (osX)

  - by stib

  I use zip to do a regular backup of a local directory onto a remote machine. They don't believe in things like rsync here, so it's the best I can do (?). Here's the script I use echo $(date)>>~/backuplog.txt; if [[ -e /Volumes/backup/ ]]; then cd /Volumes/Non-RAID_Storage/; for file in projects/*; do nice -n 10 zip -vru9 /Volumes/backup/nonRaidStorage.backup.zip "$file" 2>&1 | grep -v "zip info: local extra (21 bytes)">>~/backuplog.txt; done; else echo "backup volume not mounted">>~/backuplog.txt; fi this all works fine, except that zip never uses much CPU, so it seems to be taking longer than it should. It never seems to get above 5%. I tried making it nice -20 but that didn't make any difference. Is it just the network or disc speeds bottlenecking the process or am I doing something wrong?

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• If fiber runs 1gig fine, are there any concerns when considering upgrading to 10gig transceivers?

  - by Eric

  We had fiber installed (connecting ~10 buildings) around 5 years ago and it has been working great. The initial setup involved Procurve 2848 and 2824 switches w/ 1gig transceivers. However, lately we have been considering upgrading our network both to increase bandwidth and possibly add VOIP. However, a lot of this is assuming that we can just use pop the existing fiber into 10gig XFP transceivers in better switches and call it a day. If the fiber works fine at 1G does that mean it should be fine for 10gig? If not, how can we confirm that our existing fiber trunks will work, preferably in an affordable fashion?

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• Run Rails 3 app on a Rails 2 server/machine?

  - by chucknelson

  I'm trying to run a Rail 3 (3.0.10) app on a shared joyent smartmachine server (I don't have root access) which has Rails 2 (2.3.11) installed , and I'm not sure what to do after I freeze my Rails 3 app with bundle install --deployment. It seems like with the Rails 3 and bundler gems not being installed on the server locally, my app isn't even recognizing the local version of Rails I have frozen with my app. Has anyone gotten this to work, or have any advice? The server runs Apache, and I think I can get lighttpd installed too - but I'd rather stay with Apache if I can. Also, if it matters, Passenger is not an installed gem either...and I'm not sure I can freeze that with my app. Update 11/30/2011 12:30 PM EST Bundler is not installed on this server, either. Not sure if having that would enable the new Rails 3 "freeze" (bundle --deployment) to work or not...

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• Incremental backups in Quickbooks 2005

  - by Nathan DeWitt

  My church uses Quickbooks 2005. They have a backup to a 512 MB thumbdrive. They have been backing up about every week for the past 18 months. The filesize of the backups have grown from 14 MB to about 23 MB. I was planning on giving them a 1 or 2 GB thumb drive and calling it a day, but when I dumped this info into Excel and projected out the growth rate, I found that we'll hit 1 GB in July, and 10 GB in about another 18 months, and then 100 GB about 18 months after that. It looks to me like Quickbooks saves all the transactions with every backup. Is there a way to force incremental backups? If this is the way it is, that's fine, but I'd rather not keep buying another order of magnitude of storage space every 18 months. Can I safely delete the previous backups, and just keep the recent 2 or 3 months worth? Thanks.

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• Puppet nodes cant' find master, ec2 public versus internal ip addresses and hosts files

  - by Blankman

  If I setup my hosts files such that they reference all other ec2 nodes using the internal ip addresses, will this work or do I have to use the external ip addresses? Do I need to specify anything in my security group to get internal ip addresses to work? e.g. /etc/hosts ip-10-11-12-13.internal some_node_name If I do this, can I reference some_node_name anywhere in my scripts where I would have used the ip address previously? On my puppet agent servers, I have a reference to my puppet master like: public-ip-here puppet When I reboot my puppet agent's, syslog shows they couldn't find the master with the message: getaddinfo : name or service not known I did get it to work by updating /etc/default/puppet and I added to the options: --server=public-ip-here From what I read, puppet will by default try using 'puppet', and I set this in my hosts file so why wouldn't it be picking this up?

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• How to install Autoconf on OS X from source?

  - by chacham15

  I want to install autoconf, automake, m4, automake, etc. from the source. The problem is anything that I try and install i have to rely on autoconf. Therefore, I am trying to install autoconf i get configure.ac:30: require Automake 1.11, but have 1.10 I try to install automake, the bootstrap reports: configure.ac:20: error: Autoconf version 2.68 or higher is required configure.ac:20: the top level autom4te: /usr/bin/gm4 failed with exit status: 63 aclocal.tmp: error: autom4te failed with exit status: 63 Autoconf version: autoconf (GNU Autoconf) 2.61 Automake version: automake (GNU automake) 1.10 OS X Version: 10.7.2 XCode Version: 4.2.1

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• Why would a server not send a SYN/ACK packet in response to a SYN packet

  - by codemonkey

  Lately, we've become aware of a TCP connection issue that is mostly limited to mac and Linux users who browse our websites. From the user perspective, it presents itself as a really long connection time to our websites (11 seconds). We've managed to track down the technical signature of this problem, but can't figure out why it is happening or how to fix it. Basically, what is happening is that the client's machine is sending the SYN packet to establish the TCP connection and the web server receives it, but does not respond with the SYN/ACK packet. After the client has sent many SYN packets, the server finally responds with a SYN/ACK packet and everything is fine for the remainder of the connection. And, of course, the kicker to the problem: it is intermittent and does not happen all the time (though it does happen between 10-30% of the time) We are using Fedora 12 Linux as the OS and Nginx as the web server.

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• Hyperthreading vs. SQL Server & PostgreSQL

  - by IanC

  I have read that hyperthreading is a "performance killer" when it comes to DBs. However, what I read didn't state which CPUs. Further, it mostly indicated that I/O was "cut to < 10% performance". That logically doesn't make sense since I/O is primarily a function of controllers and disks, not CPUs. But then no one ever said bugs made sense. What I read also stated that SQL Server could put two parallel query ops onto 1 logical core (2 threads), thereby degrading performance. I have a hard time believing SQL Server's architects would have made such an obvious miscalculation. Does anyone have and data on how hyperthreading on current generation CPUs affects either of the RDBMSs I mentioned?

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• Robocopy Mirror Backup gone awry

  - by Aznfin

  I have created a simple batch file script for running Robocopy. It is set to make a backup of my user account folder to my external hard drive. Here's the parameters for Robocopy: ROBOCOPY "C:\Users\Finnly" "F:\Backups\Finnly (Backup)" /ZB /COPY:DAT /DCOPY:T /MIR /256 /MT:32 /XF *.log *.log* *.dat *.tmp *.temp *.old "ntuser*" "SyncToy*" "UpgKit.txt" ".recently-used.xbel" /XD ".gimp-2.6" ".thumbnails" ".VirtualBox" "AppData" "Application Data" "Adobe" "Camtasia Studio" "Cookies" "CyberLink" "DivX Movies" "DVD Architect Pro 5.0 Projects" "dwhelper" "GTA San Andreas User Files" "Lightroom" "Local Settings" "NetHood" "PrintHood" "Scripts" "temp" "Templates" "The KMPlayer" "Tracing" /R:3 /W:10 /V /TS /FP /ETA /LOG+:F:\Backups\Sync.log /TEE For some reason when I run it, it backs up the files and then it seems to back them up again. The size of my user account directory is 18.3 GB but the backup of it occupies over 30 GB. After reading the contents of the log generated, it is obvious that it's copying files more than once. Why is this happening? I'm running Windows Seven Home Premium 64-bit.

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• Can't create a valid symlink under VMWare HGFS

  - by Alexander Gladysh

  Host: OS X 10.6.5 VMWare Fusion: 3.1.2 Guest: Ubuntu x86 10.10 $ uname -a Linux ubuntu 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 GNU/Linux I can not create a symlink, readable from the Guest OS anywhere in the directory, mounted with hgfs: /mnt/hgfs/projects/tmp$ touch aaa /mnt/hgfs/projects/tmp$ ln -s aaa bbb /mnt/hgfs/projects/tmp$ less bbb bbb: No such file or directory /mnt/hgfs/projects/tmp$ ls -la total 6 drwxr-xr-x 1 501 users 136 2010-12-28 18:12 . drwxr-xr-x 1 501 users 8602 2010-12-28 18:12 .. -rw-r--r-- 1 501 users 0 2010-12-28 18:12 aaa lrwxr-xr-x 1 501 users 3 2010-12-28 18:12 bbb - aaa /mnt/hgfs/projects/tmp$ readlink bbb aaa The same symlink is perfectly accessible in OS X host. Is there a workaround for this?

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• Properly Hosting Multiple Sites on VDS

  - by Aristotle

  I'm going to be moving about 7-10 websites (5-8 with Databases - MySQL) onto our new Virtual Private Server. I'm curious what the best way to host many sites on a single server is though. Do I create a directory for each site immediately within my root directory, and then point the domain names for each site to http://123.123.123.123/siteDirectory - or is there a more appropriate way to do this? I'm very interested in maintining control over how many concurent connections each site can have at any given time - would I be able to do that on the directory-level, or am I required to limit the concurrent-connections to the VPS itself?

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• Access writes issue in MAC

  - by user594738

  Hi All, I have a MAC machine running MAC OS Version 10.6.6. I have added my mac machine to a domain controller (which runs Windows version of server) and allow users from domain controller to login. Because of our server migration, we removed the mac machine from old domain controller and added it to the new domain controller. Users in the old domain controller are copied to new domain controller. When I login into mac (which is added to new domain controller) with the domain controller user credentials, I was not able to access my desktop folders and any other folders in my users directory. It says "The folder Desktop can't be opened because you don't have permission its contents" Any idea why I was not able to access my home directory and how can I resolve this issue...!

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• Safari MAC proxy bypass for IPv6

  - by rhi

  I'm a first-time n00b on Mac ; (but have been doing computers since before PC's). This Mac has 2 VLANs, vlan0 in IPv4, vlan1 in IPv6. Safari can surf via IPv4 squid proxy OK. Safari can surf via IPv6 natively, if I switch off the proxy, OK. How do I set up the Settings - Network - Interface - Advanced - Proxies to "bypass" IPv6 ? Current Settings include variations along the lines of ... "*.local, 10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12 , ::, ipv6 " but don't work as expected. I want Safari to go out on its own with IPv6, not crash at the proxy with "malformed URL" Thanks, //rhi

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• Analyzing Linux NFS server performance

  - by Kamil Kisiel

  I'd like to do some analysis of our NFS server to help track down potential bottlenecks in our applications. The server is running SUSE Enterprise Linux 10. The kind of things I'm looking to know are: Which files are being accessed by which clients Read/write throughput on a per-client basis Overhead imposed by other RPC calls Time spent waiting on other NFS requests, or disk I/O, to service a client I already know about the statistics available in /proc/net/rpc/nfsd and in fact I wrote a blog post describing them in depth. What I'm looking for is a way to dig deeper and help understand what factors are contributing to the performance seen by a particular client. I want to analyze the role the NFS server plays in the performance of an application on our cluster so that I can think of ways to best optimize it.

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• Out of sync audio / video on Hackintohs

  - by user22902

  I have a PC with OSx86 on it. (10.6.2) Under Leopard my videos worked great, but now with VLC the audio is all garbled and video is way too fast. In Quicktime X video is too fast. MPlayer OSX Extended plays videos fine, but doesn't support many codecs. I have a Geforce 9800 GTX with qe ci ocl... If theres no solution, then are there any other players for OS X that support a lot of codecs? I don't like Windows so that's not an option. Thanks

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• How can I prevent the warning No xauth data; using fake authentication data for X11 forwarding?

  - by Sorin Sbarnea

  Every time I initiate an ssh connection from my Mac to a Linux (Debian) I do get this warning: No xauth data; using fake authentication data for X11 forwarding. This also happens for tools that are using ssh, like git or mercurial. I just want to make a local change to my system in order to prevent this from appearing. Note: I do have X11 server (XQuartz 2.7.3 (xorg-server 1.12.4)) on my Mac OS X (10.8.1) and it is working properly, I can successfully start clock locally or remotely.

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• Flash not Working in Google Chrome for Mac

  - by Blakeasd

  Flash has randomly stopped working in Google Chrome for Mac. All that appears is a white flash then nothing. I can hear sound, and when I right click on where Flash is supposed to be I see the Flash Player options. I have completely reinstalled Chrome, including deleting all of its support files. I reinstalled my system flash and tried making Chrome use my system flash, but nothing works. Flash is fine in Safari, but not in Chrome. How do I fix this? I am running the latest Google Chrome Dev build (21.0.1171.0) and Mac OS X 10.7.4 . Thanks!

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• homebrew in mac lion

  - by user975352

  I'm beginner of mac lion(10.7.2). I don't know well about mac but ubuntu. I installed homebrew to my mac, and I did command below. $ brew install git and then $ brew update error: Could not resolve host: github.com; nodename nor servname provided, or not known while accessing https://github.com/mxcl/homebrew.git/info/refs fatal: HTTP request failed Error: Failed while executing git pull origin refs/heads/master:refs/remotes/origin/master What's happen in my mac? How to resolve this? Would you help me?

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• Using a Raspberry Pi as a VPN?

  - by sudo rm -rf

  So I'm sure many of you have heard of the new Raspberry Pi project. I was looking at messing around with Model B, which has the following relevant specs: Broadcom BCM2835 700MHz ARM1176JZFS processor with FPU and Videocore 4 GPU 256MB RAM Boots from SD card, running the Fedora version of Linux (ARM Version) 10/100 BaseT Ethernet socket USB 2.0 socket So I was curious if it would be possible to create a simple VPN out of this little machine. I do realize that since it's an ARM processor that might mess up quite a few things. Any ideas if this is possible? Just for what it's worth, this would be a personal project so I'm not worried about performance.

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• Cisco asa 5505 locks up / unresponsive

  - by Chris

  We have a cisco asa 5505 that's new (in service for about 2 months) running 7.2(4) software. Every day around 10a it locks up for approx 10 minutes. We're monitoring it via snmp with stg, and snmp doesn't respond during that time. There's no output in the 'show crash' output. Internet connectivity is also dropped. Wondering if anyone else has seen this and what the fix might be. Currently we're looking at upgrading software, but will need memory upgrade for that. We've forced the speed and duplex on the internal and external interfaces, but the problem is still occurring. It's connected on the internal lan to a netgear 724 gige switch.

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• reduce timeout when connecting to wrong IP (XP-XP, windows explorer)

  - by Viki

  I have many shortcuts in the form \10.0.0.123\path in Windows Explorer (XP). Some of the IPs are sometimes dead (those vmware machines that are inactive). The problem is, when I try to open "Properties" on such shortcut (to correct the IP, or to delete it), Windows Explorer freezes for minutes. For very long time. Start menu freezes, too. This is very inconvenient. How can I reduce the windows explorer timeout when it is probing the connection to another XP share ?

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