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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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• Understanding connection tracking in iptables

  - by Matt

  I'm after some clarification of the state/connection tracking in iptables. What is the difference between these rules? iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT Is connection tracking turned on when a packet is first matched containing -m state --state BLA , or is connection tracking always on? Can/Should connection state be used for fast matching like below? e.g. suppose this is some sort of router/firewall (no nat). # Default DROP policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Drop invalid iptables -A FORWARD -m state --state INVALID -j DROP # Accept established,related connections iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow ssh through, track connection iptables -A FORWARD -p tcp --syn --dport 22 -m state --state NEW -j ACCEPT

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• How to set umask for a folder and it's subfolder?

  - by Cyril N.

  I'm working on the same directory with some friends and they access it via SSH. I added us in the same group and defined a sticky bit to keep the user:group values the same. But when a user create a file/folder, the Write attribute is not defined for the group, disabling other to write it/on it. How can I define the Umask to add the Write value for groups in the specific directory and it's subfolders ? I tried to find some help before, but I only saw helps for Fedora/CentOs, and I'm using Debian Squeeze. Thanks for your help

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• using git on DOS command line asks for password - but not when using TortoiseGit or gitBash

  - by Sandy

  I would like to use the DOS command line to enter the command: git clone "git_path.git" myDir It asks me to enter a password which I would like to avoid. I usually use TortoiseGit to do all git related operations. I would like to setup cruisecontrol using ant with a custom git task. Therefore I need to perform git clone on the command line in Windows 7. But it only works using git bash and not DOS. According to other forum entries, I tried to convert the key with puttyGen and put the file id_rsa in c:/Users/myName/.ssh I also added an authorized_keys file but it still asks for a password. Any ideas? Thanks

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• Why won't my files push to my SFTP server?

  - by Matthew

  I'm having trouble pushing my branch to an SFTP server. I'm following the instructions here. When I push the branch, everything seems to complete successfully. I get the message "Created new branch.", and if I do "bzr push" again, it says "No new revisions to push." But when I ssh to the SFTP server to look at the directory I put my branch in, only the .bzr directory is there. None of my files are there. Does anyone have any idea why this might be?

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• Web site kills hard disk I/O, how to prevent?

  - by Taras Voynarovsky

  The situation: I have a server, on which we have 2-3 projects. Starting not long ago, the server started hanging up (We could not connect to it by ssh, and the connected clients had to wait 20 minutes for top to give results) Early today I managed to execute gstat while it was in this state and saw, that it stays on 100% on da0, da0s1 and da0s1f. I dont quite know what those ids meen, but I understand that some processes just kill the HD by bombing it down with requests. I ask of some propositions. I dont know how to find the culpit and can't prevent this. I have freebsd on server.

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• private subnet nat (openvpn / racoon)

  - by Jonas Schnelli

  I have a openvpn subnet 10.8.0.0/24 running one server and one client (laptop). openvpn works fine. Browsing the web over openvpn from the laptop works also fine. Now on the server there is a private subnet with 10.7.8.128/28. The subnet is set up with racoon (IPSEC s2s vpn). The s2s vpn allows me to access the subnet 10.3.5.0/24 at the other s2s vpn end. Works all fine when I'm connected with ssh to my server. From my laptop i can ping 10.7.8.129 (the servers ipsec local ip) but i cannot reach the net 10.3.5.0/24. I tried to add a static route on my laptop 10.3.5.0/24 over gw 10.7.8.129 with no success. Any ideas how i do setup the nat / routing? Thanks

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• irssi keybinding: backward_word/forward_word

  - by vikenemesh

  I'm currently experimenting with irssi as my irc client of choice and I'm getting along pretty well. BUT there is one thing I still need to get done. Somehow it isn't possible for me to use the usual CTRL+Left/Right to navigate between words in my input line. For the record: I'm using irssi on a linux-box through a screen session brought to my windows machine via ssh/putty. I already tried some key binding in irssi, maybe I did them wrong? /bind meta-n backward_word /bind meta-m forward_word both work fine. But neither /bind ^left backward_word /bind ^right backward_word nor /bind cleft-left backward_word /bind cleft-right backward_word work for a CTRL+Left/Right setup. Any Ideas?

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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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• Forward svn port

  - by ankimal

  We have our svn server on a machine not accessible from the internet. But we need to be able to check out code from the internet over ssh. Given that we can do port forwarding on a machine accessible from the internet, whats the best way to set this up? Internet -> A machine on our network - > svn server (Port forward here? ) If not port forwarding, whats the most secure way of doing this, if there is any?

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• Problem running application on windows server 2008 instance using amazon ec2 service and WAMP

  - by Siddharth

  I have a basic (small type) windows server 2008 instance running on amazon ec2. I've installed WAMP server on to it, and have also loaded my application. I did this using Remote desktop Connection from my windows machine. I'm able to run my application locally on the instance, however when I try to access it using the public DNS given to it by amazon, from my browser, I'm unable to do so. My instance has a security group that is configured to allow HTTP, HTTPS, RDP, SSH and SMTP requests on different ports. In fact I have the exact same security group as the one used in this blog, http://howto.opml.org/dave/ec2/ I did almost everything same as the blog, except for using a different Amazon Machine Image. This is my first time using amazon ec2, and i can't figure out what I'm doing wrong here

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• CentOS 6 - iptables preventing web access via port 80

  - by bsod99

  I'm setting up a new web server with CentOS 6.2 and am not able to connect via the web. Everything looks set up correctly in httpd.conf and Apache is running, so I'm assuming it's an iptables issue. Is there anything in the following which could be causing the issue? # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited ACCEPT tcp -- anywhere anywhere tcp dpt:http Chain FORWARD (policy ACCEPT) target prot opt source destination REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT)

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• Choosing a Linux distribution

  - by Luke Puplett

  Dangerous territory with this question so please try to be impartial and instead focus on what to look for when choosing a Linux distribution. I'm completely new to Linux. I thought it'd never happen but I need to have a Linux box to play with and I have a spare fanless Atom PC (32-bit only). I'll be using the machine as a non-commercial hobby server, the trouble is, I don't even know how to compare Linux distributions and why people pick one over another. If anything, I want to have an easy install from USB stick. My question is: what do you look for when choosing a (free?) Linux distribution for a server? If you can, please explain what sorts of things actually differ between one and another without saying which you think is better, just the facts. The way I see it, Linux as a server is just an SSH console and I find it hard to imagine what could be different between one and another.

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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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• 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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• Uninstall nginx on Ubuntu 10.04.3 LTS remote machine

  - by user831740

  I was given a server to setup, problem is this server was no reset, and the provider is quite slow on resetting it, so I have to completely uninstall some stuff it has, one of which is nginx. I had a few problems when doing setup on my local machine for nginx due to multiple installations of it, so I want to avoid the same mistake now. Problem is, I got no idea how nginx was installed here, and I need to remove it. When I access the server thro SSH i only have this folder $HOME/backups/nginx any idea how to uninstall this? Whenever I google it only come up with apt-get uninstall and so forth. Thank you

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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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• Remote X-windows between new RHEL5 and old Solaris 8

  - by joshxdr

  I have a very small lab network with three boxes: a modern x86-based RHEL3 box, an x86-based RHEL5 box, and a 1998-vintage SPARC Ultra5 with Solaris 8. I can use ssh -X to run a program on the RHEL5 box and view the windows on the RHEL3 box. I believe this uses xauth and magic cookies?? I have followed the X-Windows HOWTO to set up xauth on the Solaris box, but so far no dice. I would like to be able to use the X-windows server on the RHEL3 box with a client program on the Solaris box (program running on Solaris host, windows appearing at Linux host). Is there a trick to this, or have I made a mistake following the instructions for setting up xauth and magic cookie?

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• Rsync : execute permission required

  - by user651488

  I'm using rsync between two servers to transfer files. The problem is some files are not transferred. I get this error : rsync: readlink "/var/www/index.html" failed: Permission denied (13) So I check permissions on the server and after make tests, I notice a file is transferred only if it has these permissions : R-W ! If the file have these permissions : R--, Rsync can't download it !? Command: /usr/bin/rsync -avzr -e "/usr/bin/ssh -i /home/replication/thishost-rsync-key" [email protected]:/var/www/index.html ./ Is it a bug with Rsync ? I find any information about this problem. Thanks for your help Debian Etch 2.6.30 Rsync 2.6.9 protocol version 29

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• Intermittent apt-get 'no installation candidate' error on fabric deploy

  - by jberryman

  I'm experiencing a strange issue with a fabric script I'm using to bootstrap a server on EC2. I launch a stock Ubuntu 12.04 AMI, wait for it to start, then proceed with: with settings(host_string="ubuntu@%s" % i.dns_name, connection_attempts=30): sudo('apt-get -qy update') sudo('apt-get -qy install --no-install-recommends mdadm') # don't install postfix #etc... The apt-get update appears to run fine and gives no errors, however (2/3 of the time or so) installing mdadm throws a "no installation candidate" error. When I ssh into the server and run apt-get install mdadm I get the same error. Running apt-get update by hand, then the package installs fine. Any ideas on what might be happening, or ideas for debugging?

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• Start Daemonised GNU Screen from script a allow calling script to end

  - by tez

  I have a script on an embedded device that calls screen to start if a user logs in via a ssh session... #!/bin/sh SCREENRUNNING=`pgrep SCREEN` if [ -z "$SCREENRUNNING" ]; then echo "Screen not running so let's start the Master session sleep 2 screen -dmS Master sleep 2 screen -x root/Master else echo "Screen is already running let's connect to existing session" sleep 2 screen -x root/Master fi However this keeps the calling script active till the screen session exits,even if it's detached. What I want to do is have the calling script finish and exit while the screen session stays active. I've tried daemonising the screen -x lines and adding an & to the end of the screen -x lines neither of which work properly. Ideas?

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• Using Hamachi VPN to connect to Linux VM at home

  - by Cameron Verotti

  I have a CentOS 5.10 Linux box at home running on VMWare, with Windows 2008 as the host. I have set up a Hamachi VPN so that I can connect to the Host server from work, I attempted to add a second VNIC to the VM and bridged it to the hamachi Network Interface. I spun up the VM and checked eth1 with ifconfig and its throwing me a ipv6 address not a ipv4. I want to hook this VM up so that I can run a ssh command from work to the VM. MY network at home is all on Local 198.168.. hence the need to make a VPN network like Hamachi. I cannot seem to find anything that tells me or helps me with tunneling my Linux VM via Hamachi. Any help would be fantastic!

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• How to elegantly selectively exclude FreeBSD network traffic from OpenVPN interface by port

  - by Polygonica

  inexperienced sysadmin here. I'm planning on running a net daemon inside a FreeBSD jail through OpenVPN, but want to be able to SSH directly into the jail and use the daemon's web interface daemon without going through the VPN. As I understand it, an OpenVPN tunnel is normally set up as a default virtual internet interface, and so incoming traffic will go out on the OpenVPN interface by default (which is problematic, as this incurs latency). I thought "well, obviously, since all of this traffic is leaving on a handful of ports, I'll just redirect those to the non-VPN gateway." I've tried to look for solutions, but almost all of them involve iptables instead of ipfw (which is default for FreeBSD) and solve slightly different problems. And alternate solutions like using multiple default routes to ensure that incoming traffic on any interface is always sent out on the same interface seem far-reaching and require deep knowledge of all tools involved. Is there an elegant way of ensuring that traffic leaving on specific ports exits on a specified non-default interface using ipfw?

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• backuppc - how to backup remote (over the internet) clients?

  - by Scott

  I am testing out backuppc, which works great so far backing up windows clients on a LAN via SMB (no backup client/agent required). However I have quite a few laptops and desktops that are in various remote locations - some of which move around. I need some way to have that remote computer create an outgoing connection for backup purposes (Windows XP/7). I know backuppc supports smb, rsync and 'tar', but I believe these are all connections going from the server TO the client. SO, I either need a way to vpn the client on a timed basis, or it would be a lot better if the client could some how connect to the server (ssh?) and initiate it's own backup somehow (rsync?). Of course this all needs to be pre-installed by me and require no maintenance by the end user, no dialogs on their side. What do you think?

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• Verizon Fivespot firewall

  - by Patrick

  I have a Verizon Fivespot Wi-Fi router and am having issues connecting to the computer that uses it to get on the internet. I am able to connect to the Fivespot admin pages remotely and I am able to connect to the internet from the computer behind the Fivespot. There are two sections pertinent to this issue, Port Filtering And, Port Forwarding I've tried each individually and both together but cannot access anything through the router except for the admin page. I am trying to connect through SSH to an Ubuntu 10.04 box over wifi. I have called Verizon Tech Support but they were unhelpful, the person essentially read what it says on each screen without any elaboration. Any help is greatly appreciated!

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