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• Is it possible to code on two different computers simultaneously?

  - by Muhammad

  I want to work with another programmer and I want the source code to be live in real-time on both of our screens. Is this possible on the Mac OS x or Linux? We're going to be using OS X but occasionally we might need to add an Ubuntu computer too. Is there a way I can do this using ssh, any shell based program, or even a good GUI? I thought Coda might be capable of this but it's not really working. Anyone ever do this? I'm not look for a git/svn/or any other version control system. This is more of a live coding session. :)

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• APF, IPTABLES, Fedora 15 - Not blocking correctly

  - by RichardW11

  I just got a new remote server which came with Fedora 15. I first tried to run APF but it gave me this error "apf(18031): {glob} unable to load iptables module (ip_tables), aborting.". Which I then set SET_MONOKERN="0" to SET_MONOKERN="1" to resolve the problem. However, with my config file showing BLK_P2P_PORTS="1214,2323,4660_4678,6257,6699,6346,6347,6881_6889,6346,7778" The ports show up as closed, instead of being filtered. Any idea why this would be happening? 22/tcp open ssh 80/tcp open http 443/tcp open https 2323/tcp closed 3d-nfsd 4662/tcp closed edonkey 6346/tcp closed gnutella 6699/tcp closed napster 6881/tcp closed bittorrent-tracker 7778/tcp closed interwise

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• Xterm is not completely erasing field lines

  - by user26367

  We have a SSH tunnel to a remote unix box from Windows clients using Cygwin. It launches a terminal program from the unix box locally on the Windows box for data input. The xterm window is launched as follows xterm -fn 10x20 -bg DodgerBlue4 -fg white -cr white -ls -geometry 90x30 -e program When a screen goes from read only mode to edit mode, the edit fields have ____. When going back to read only mode, a single pixel artifact is left behind for each field. *readonly* User: *edit* User: ___________ *after edit exit* User: . <- this dot is left behind Any idea what we need to change to fix this?

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• Proxy server on windows with SSL encrypted exchange with client

  - by Syffys

  I want to set up a classic proxy server (HTTPS, HTTPS, SSH, FTP, etc...) on a windows platform, but I need the following features: password authentication for clients data exchanged between clients and server to be SSL encrypted I've been trying to set this up various application to get this result, but without success so far: Squid for windows ccproxy wingate Alternatively, an other solution would be an HTTP SSL tunnel encapsulating an unencrypted proxy connection between clients and the server. I've spent a lot of time without any result so far, so I'm wondering if anyone faced this kind of issue. Thanks in advance!

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• Auto-scaling EC2 Servers and Updating Code

  - by jstats

  We've come to the point where we need to set up autoscaling for our web server and I'm unsure how to go about the process of scaling servers and updating the the existing code without remaking a new AMI and changing the autoscale config to use it. I've read a bit about people bundling the new code and uploading it to s3 and having new servers grab the bundle on boot up but that doesn't seem all that pleasant either. Currently the web app's files live in a git repo, and when we update the code, we push it to github, ssh into the web app and run a hook to bring down the latest code. So I was thinking that another option could be to just run that hook on an hourly or daily cron task. Unfortunately that doesn't cover everything type of update (for example new blog posts' images and such which aren't included in the git repo) but it's something. Could anyone provide some advice on what a common solution is or anything as to why my proposed solution is a bad idea? Thanks all

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• Do TCP connections work differently within the same subnet?

  - by Dean

  I've encountered some network behaviour that confuses me while trying to get Java RMI working. I use netcat to connect to a local machine: [my_machine]$ nc -w 1 192.168.0.100 60000 && echo success success I try to do the same to my server: [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success This doesn't work, unless I explicitly listen on the server socket: [amazon_ec2]$ nc -l 60000 [my_machine]$ nc -w 1 my-servers-ip 60000 && echo success success For the version that fails, the SYN packet receives a RST, ACK in response. I'm not too knowledgable about this stuff, at this point I only have wild theories such as the one in the question. Any ideas? Potentially useful details: Local Machine (192.168.0.100) - Macbook Remote Machine (Amazon EC2) - Amazon Linux AMI 2012.03 Security Group Settings: 22 (SSH) 0.0.0.0/0 1099 0.0.0.0/0 49152-65535 0.0.0.0/0 "iptables -L" shows no rules set

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• Locked out by changing file permissions

  - by Valeriy

  I just locked my root account (and all other accounts if it matters) completely out of the RHEL 5.4 by changing permissions on every file to 400. Now I have "Permission denied" on any command that I try to run, including chmod itself. Any idea on how to recover? The only access I have to the server is via terminal or SSH. (If anyone cares how it happened, I was running a hardening script and one of the lines was supposed to change permission on some config files in /etc directory. It has couple of variables that had not been set, so the command essentially evaluated to chmod -R 0400 /* Ouch! This is sure a great lesson on checking the scripts even more carefully in the future but what can I do now?

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• something like persistent X forwarding?

  - by Arthur Ulfeldt

  I'm having trouble with the title on this one, please edit. When users connect to a VM with VNC/NX/RDP/other-tla they get a persistent desktop in a window . When they connect using ssh -X forwarding they get a local window managed by the local windo-manager that is not persistent. 1: is there a way to run a program on the VM and have it managed locally AND have it persistent? 2: can the client be on windows or OS-X? ps: in this case the vm's are running Ubuntu

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• What is a good php 5.3.x shared hosting company?

  - by Abba Bryant

  I am looking for the best shared host - features-wise, not price - for hosting CakePHP and Lithium applications. I would like to be able to use MongoDB / MySQL as well as have access to some of the more common PHP extensions like MCrypt, etc. I currently use dreamhost with a custom PHP 5.3.x build on my sandbox domain - Please do not suggest this as a solution. I want to move away from managing my own PHP build if possible. I need ssh access but email support isn't as big of an issue.

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• Config deployment on multiple servers.

  - by user66601

  I have multiple servers in WEB cluster (identical configuration for all of them, despite the IP) How do you deploy changes in configs on multile servers? I make the new config, then create config per every server (placing correct IP), and next: upload them on every server, replacing old ones (rsync over ssh) set on every server a job which reloads webserver at the same time (servers use ntp). - this done by issuing commands by script (to save time for logging in) before adding a job for server reload - there's checksum test of the config on the server) - an a notification in case of fail How do you see such method? What should be the "professional way :) ? (I don't say my way doesn't work... it works and saves my time not used for logging on every webserver.) Regards,

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• rsync windows to linux permission denied

  - by user64908

  Using Command rsync -avzP --delete --omit-dir-times ../../ [email protected]:/var/www/mysite/ I'm getting rsync: mkstemp "/var/www/mysite/.." failed: Permission denied (13) If ext is in the www-data group should I still set all the files to be owned by user www-data? I am trying to publish the files with rsync and then set the permissions using sudo chown -R www-data doc sudo chgrp -R www-data doc but I can't even rsync because of the permission denied. The SSH works fine, the rsync too except when it tries to write over or update some of the files in /var/www Client * Windows 7 * Cygwin 1.7.16 (GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)) * rsync version 3.0.9 protocol version 30 Server * Ubuntu 12.04 * Apache2 * Root Accounts [ubuntu,ext] * Groups [www-data] * sudo vigr has www-data:x:33:ubuntu,ext I have already configure this http://stackoverflow.com/questions/2124169/cwrsync-ignores-nontsec-on-windows-7 This article has also managed to confuse me http://unix.stackexchange.com/questions/41687/how-should-i-rsync-files-in-var-www-if-i-want-them-to-be-owned-by-www-data What is the right procedure?

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• rsync server side limit bandwidth/connection

  - by c2h2

  In a VOIP application, I have upto 3000 clients rsync audio files from there linux server in a daily, server is placed at a data center (10Mbps in/out bound), the server works as a VOIP sip server running FreeSWITCH (low ping latency should be ensured.) Therefore I would like to have server side control of rsync which controls: Limit total outbound bandwidth. Limit total number of connections. (Reject clients while at max number of connection and let it retry after a specific time frame.) OPTIONAL: list/kill individual connections. Normally I would use ssh + rsync + pem_keys with some extra options, but above requirements are not feasible by simple command lines. Can anyone point me some direction. or show some scripts/tools? I would also probably integrate them and release on github. Thanks!

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• DIsable my nv video card driver in linux

  - by Dahaka Wang

  I'm trying to passthrough my nv video card to my domU, but I could not bind my video card to the pciback driver I only have one video card with the pci number 0000:03:00.0, so I used the following command echo -n "0000:03:00.0" > /sys/bus/pci/drivers/nouveau/bind to unbind the nouveau driver from my video card. The screen went black because I have forcefully removed the video driver, therefore I ssh'd into the computer to run further commands I ran: echo -n "0000:03:00.0" > /sys/bus/pci/drivers/pciback/bind to try to bind it to my pciback driver, but I got: bash: echo: write error: No such device I found out that this was the message shown when trying to bind a PCI device which is already bound. Therefore, I think that something was still using my video card Can anyone help me out? Thanks a lot!

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• xm console command is not working in XEN

  - by stillStudent

  I have XEN 4.0.x.x rpm with CENT OS. I have set it up and have many VMs on it. But problem is when I execute 'xm console ' command from dom0, command just hangs dom0 and some 'y' comes up in next line but nothing really happens. Is it a bug in xen 4.0 and I need to upgrade it or I can tweak some configuration file in /etc/xen/ to make it work. I found following at some site but its not working: In order to be able to login to your domU from the console using: xm create {your hostname}.cfg -c (to the set root password for ssh, for instance, or to see more output than just kernel output when debugging) it may be necessary to add the following line to your /etc/xen/{your hostname}.cfg extra='xencons=tty' Is there any other way to solve it?

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• How do I configure ubuntu server's iptables to allow java without opening the floodgates?

  - by rofls

  I'm new to servers, so please bear with me. I have my amateur site running. Problem is, I followed Rackspace's instructions on setting up iptables and am pretty sure that's why the java server I'm trying to use on port 8080 isn't working (it runs the script but my android test app doesn't connect to it). When I try running the same java server script on port 80 it doesn't even start. I also ran nmap on my domain and saw that indeed only port 80 and 22 (for ssh) are responding. Is it possible to run Java and apache happily on the same server? If so, how can I configure my iptables correctly. (I'm aware that I should probably do some sort of filtering in the java server itself, but will figure that out later).

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• virsh console and tty size

  - by pehrs

  I have a virtualization server to which I connect over ssh. If I now change the size of the window it will automatically propagate to the server. It's most easily seen using stty -a, checking the columns and row values. I then use virsh console to connect to the serial interface on a KVM based virtual machine. When I now change the size of the window it does not propagate to the virtual server. This is most easily seen by checking stty -a, which is not updated on the virtual machine when I change window size. This means that line breaks does not work correctly in the terminal and any application that relies on window size for formatting (emacs, man, etc) gets messed up unless the window size on the client matches the default size on the server. A workaround is to manually set the window size to match the client window using stty, but I wonder if there is any way to get this information to propagate and set the window size in the virtual machine automatically.

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• Can ping/nmap server, nothing else

  - by lowgain

  I was SSHed into our ubuntu LAMP server , and was just doing a svn update, which hung. I disconnected, and since then, I have not been able to SSH in or view any of our websites (neither from my network or through a remote machine). I would have just assumed the server went down, but I can ping the machine and get really quick responses. Using nmap on the box shows all the normal ports open, so I am confused This server is hosted remotely in a datacenter, do I have any remaining options except contacting them for support? Thanks!

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• Speeding Up Search On Ubuntu File Server Accessed Through Windows

  - by John Birdy

  I run an Ubuntu box as a media server, which I use to either share files (copy and paste off of the network drive), or stream to my computer (which runs Win7), or to my xbox. I have a lot of files on there, especially music. Currently when I'm searching for a file, I just use Windows' search, which can be quite slow. I was wondering if there were better ways to search from my Windows box? I'd prefer not to SSH in to the box and use find or something like that. Is there any way to speed up Windows' search? Or an easy alternative? Thanks!

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• Load on Ubuntu 8.04 LTS high

  - by Paddington

  My Ubuntu 8.04 LTS server periodically has a high load avg spike(once every 2 days) resulting in Apache timing out and virtualy everything even SSH to the server is not possible. When I am on the console and run TOP is see that The load avg increases from less than 1 to above 60 in 15 mins. How can I isolate the cause? top - 09:21:51 up 37 days, 20:18, 6 users, load average: 5.41, 5.53, 5.36 Tasks: 160 total, 2 running, 156 sleeping, 0 stopped, 2 zombie Cpu(s): 65.0%us, 8.8%sy, 0.0%ni, 1.0%id,24.6%wa, 0.3%hi, 0.3%si, 0.0%st Mem: 3989468k total, 3444984k used, 544484k free, 360460k buffers Swap: 11687248k total, 178168k used, 11509080k free, 881772k cached

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• IP not detected in terremark enteprise cloud server - how to install VMware on instance?

  - by JohnMerlino

  Using terremark enteprise cloud, when you create a server, you assigned an IP address to them and that IP is visible under Detected IP when selecting the server. However, I created a server, with IP address and I created an internet service and connected it with a node. I used protocol TCP and mapped it to port 3001. But I notice when I select my server, the IP address doesnt dsplay under Detected IP and then I VPN Connect, launch terminal and try to SSH with the IP to my server, and I get connection timed out. I presume the reason lies in that the IP address is not being detected. Someone suggested that my VMware-Tools is out of date and in fact on the server instance for VMware-Tools it does say "out of date". I'm not sure how to mount the instance and install VMware-Tools. I am using Mac OSX. Someone said that it will only work on PC running IE.

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• Creating user accounts in Amazon EC2

  - by Tvanover

  I am putting together a test environment using Amazon's EC2 for me and some friends to collaborate on a project. I am not a server guy but I do know my way around a bash prompt and have done some work on ubuntu before. I am using Amazon Linux AMI i386 EBS and have gotten apache and php running. Now I need to create the user accounts my friends and I will use to upload files (sftp) and work on the project (ssh). How should I go about this? Should I just use adduser and configure it like normal? Or should I use the AWS IAM groups?

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• How to use radiusclient-ng?

  - by Muhammad Gelbana

  A guy on my team compiled the radiusclient and radlogin executable found on that page. But installing it is getting more and more problematic and I can't seem to get anywhere ! I received from him: radclient libfreeradius-client.so.2 servers radiusclient.conf dictionary.dat radlogin What I'm trying to do is to install this client on a linux box and the: Access that box remotely using ssh. Then issue a authentication\accounting requests to another remote RADIUS server. But nothing seems intuitive about this and I have very little experience with linux and RADIUS protocols ! Has anyone successfully installed that client ? Thank you.

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• How do I ask screen to behave like a standard bash shell?

  - by thornomad

  Just learned about the screen command on linux - it is genius. I love it. However, the actual terminal/prompt in screen looks and behaves differently than my standard bash prompt. That is, the colors aren't the same, tab completion doesn't seem to work, etc. Is there a way I can tell screen to behave just like a normal (at least, normal as in what I am used to) bash prompt ? Additional Information I am connecting via ssh from a Mac (Terminal) to a headless linux box (Ubuntu). After logging in, I have TERM=xterm-color and when I run screen I have TERM=screen. Am going to try the suggestions below to see if I can change the $TERM value first.

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• linux intrusion detection software

  - by Sam Hammamy

  I have an Ubuntu VPS that I use for practice and deploying prototypes as I am a python developer. I recently started teaching my self sys admin tasks, like installing OpenLDAP. I happened to turn off the ufw firewall for just a minute, and when I ran an netstat command, I saw a foreign ip connected to ssh that I traced to china. I'd like to know a few things: 1) Is there any good network intrusion detection software, such that if any IP that's outside a specific range connects to the VPN, I can be notified? -- I am thinking about scripting this, but I'm pretty sure there's something useful out there and I believe in the wisdom of crowds. 2) How did this person gain access to my server? Is it because my firewall was down? Or is it because they browsed my LDAP directory and from there figured out a way to connect (there was a clear text password in the tree but it wasn't one used by the server's sshd)?

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• LAMP server has gone down a few times. Ideas for server optimization?

  - by MattB

  Hi all, Our production web server has gone down a few times over the course of the last half year. In the end, we've needed to contact the web host and have them restart as I'm unable to even SSH in. This appears to only affect the web server and not the MySQL database server which is separate. When it affects the web server, all hosted websites time out. I'd like to examine web server optimization/corrections to get to the root of this issue. Any recommendations on how to proceed with that? I'm sure log files would play a role. I'm able to find my way around a Linux-based server and make needed changes, but would be interested in any tips I may not have thought of yet. It may be best for us to speak with an outside consultant as another option. Thanks.

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