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• rsync without password, none of google (server fault) tutorials worked

  - by Jake Armstrong

  I need to use rsync for a daily backup operation and in the past (on different servers) I managed to just use a rsa key etc, but now none of google (serverfault) tutorials work at all. It keeps asking me for a password. I have webmin and ssh/root access to both servers. My steps: create a key on server 1 send key.pub to server 2 add key.pub to .ssh/authorized_keys chmod 700 .ssh/authorized_keys go back to server 1 and try rsync and it keep asking for password... rsync command: rsync -avz -e ssh file.txt root@server2:/root EDIT: well, I cleaned up everything and this time, instead of inserting a custom name to the key I used the standard one on server1. sent the .pub to server2 and it worked as a charm... So the answer is that server1's ssh wasn't even using the right key...

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• Failed dependency while installing browser Iron(A google chrome clone)

  - by Krishnadas PC

  Installation failed while trying to install Iron browser. [root@localhost softwares]# rpm -ivh iron64.rpm error: Failed dependencies: libc.so.6(GLIBC_2.15)(64bit) is needed by iron64-29.0.1600-2.x86_64 libudev.so.1()(64bit) is needed by iron64-29.0.1600-2.x86_64 libudev.so.1(LIBUDEV_183)(64bit) is needed by iron64-29.0.1600-2.x86_64 and when tried to install using yum it failed also.

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• Interested in scp recipe for sftp [closed]

  - by GJZ

  You wrote in a reply this Blockquote The problem is that sftp runs as the user's id -- first, the sftp client ssh's into the target host as the given user, then runs sftp-server. Since sftp-server is running as a regular user, it has no way to "give away" a file (change owner of a file). However, if you are able to use scp, and assign a key pair to each user, you can get around this. This involves adding a user's key to root's ~/.ssh/authorized_keys file, with a "command=" parameter to force it to run a script that sanitizes and alters the arguments of the server-side scp program. I've used this technique before to set up an anonymous scp dropbox that allowed anyone to submit a file, and ensure that no one could retrieve submitted files and also prevent overwrites. If you are open to this technique, let me know and I'll update this post with a quick recipe. We are interested in this scp quick recipe for our community services file sharing. Best Regards, Gert Jan Zeilstra

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• How to open port 25 on the server

  - by liuxingruo

  I'm using centOS. I want to implement a smtp mail server, and I have installed postfix and dovecot(both have been set correctly). I tried to telnet the 25 port, but it returns Unable to connect to remote host: Connection refused So, How can I open the 25 port? Thanks!

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• How to know my wireless card has injection enabled?

  - by shrimpy

  I am playing around with aircrack. And was trying to see whether my wireless card on my laptop can pass the injection test And I end up seeing the following... does it mean my wireless card is not able to run aircrack? root@myubuntu:/home/myubuntu# iwconfig lo no wireless extensions. eth0 no wireless extensions. eth1 IEEE 802.11bg ESSID:"" Nickname:"" Mode:Managed Frequency:2.437 GHz Access Point: Not-Associated Bit Rate:54 Mb/s Tx-Power:24 dBm Retry min limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=5/5 Signal level=0 dBm Noise level=-57 dBm Rx invalid nwid:0 Rx invalid crypt:781 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 root@myubuntu:/home/myubuntu# aireplay-ng -9 eth1 ioctl(SIOCSIWMODE) failed: Invalid argument ARP linktype is set to 1 (Ethernet) - expected ARPHRD_IEEE80211, ARPHRD_IEEE80211_FULL or ARPHRD_IEEE80211_PRISM instead. Make sure RFMON is enabled: run 'airmon-ng start eth1 <#>' Sysfs injection support was not found either. root@myubuntu:/home/myubuntu#

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• How can one keep secure regular backups of his desktop on a remote server through aDSL? [on hold]

  - by Antonis Christofides

  I'm a system administrator and I use rsnapshot to backup some servers, duplicity for some others. Both work fine, each one with advantages and disadvantages. Despite that, I am at a loss on how to backup my own private files. I'd use duplicity to automatically backup my files to a remote server; but the problem is that once in a while I must do a full backup. My emails and important files are 9G, and I expect this to increase. Uploading through aDSL at 1Mbit would be 20 hours. Too much. rsnapshot doesn't require periodic full backups (only the first time), but it must be running on the remote server and have a means to connect to my computer; if the server is compromised (or simply if the NSA decides to use it), my own machine is also compromised. Not good. The only solution I've come up with is use encfs, use unison to synchronize the files to a remote server, and use duplicity or rsnapshot on the remote server to backup these files. In that case, the question is whether I can sync the files on many computers; is it possible for encfs to be used with the same key on many computers? I also think that if I append one character to the unencrypted file, its encrypted encfs counterpart might change a lot, so that incrementals with duplicity would be less efficient—but not a big deal. Maybe also, when I need to restore a file, finding the correct file to restore could be a pain, because of filename encryption. I wonder whether there is any other possibility that I've overlooked. Maybe I'm asking too much for my personal use, and I should settle with an external disk?

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• How to Remove the Last 2 Lines of a Very Large File

  - by Russ

  I have a very large file ~400G, and I need to remove the last 2 lines from it. I tried to use sed, but it ran for hours before I gave up. Is there a quick way of doing this, or am I stuck with sed?

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• VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

  - by Spirit

  Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ports but when we plugged the cable in one of the ports the link simply does not wanted to activate :S... Does anyone with more VMware experience have ever had similar problem? From what I know is that 1Gbps NICs are backwards compatible with 100Mbps switches. This is what we've tryed so far but with no success: Tryed: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004089 Tryed to modify the /etc/modules.conf folowing the guide from this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=813 After the changes I have restarted the networking services using # service network restart, # service mgmt-vmware restart and # service vmware-vpxa restart It seems that no matter how many times, or whatever approach/method (GUI or Shell) we try to change the speed and duplex of the network adapter and to force it to 100mbps it only accepts 1Gbps .. I am starting to go nuts :@

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• lilo.conf questions

  - by Jack

  I use lilo, and have two different kernels. One is newer and use KMS with it. What I would like to do, is to be able to set vga=xxx for only one of the kernels. Is this possible? I would also like to be able to code into lilo.conf options that I pass on the commandline, but am unsure how to do this

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• Rendering a frame is producing noise from speakers in Windows and Linux

  - by Robber

  When any hardware accelerated application is rendering a frame (or many of them) a very short noise is coming from my speakers. This can be a game, a WebGL application or XBMC. When the application/game is rendering many frames per second (like most of them do) the noise is a continuous buzzing that gets higher pitched with higher framerates. This applies to Linux and Windows, so I'd assume it's a hardware problem. The current hardware in the PC is: CPU: Core2Quad Q9550 GPU: Radeon HD 5770 RAM: 2x2GB DDR2 Motherboard: Asus P5QLD PRO PSU: be quiet! Pure Power 530W Screen and speakers: Old 720p LCD TV connected via VGA and aux cable Muting the TV stops the noise, muting Windows doesn't. I tried replacing the PSU first (used a Tagan 700W PSU before) because I thought it was a power problem. It wasn't. I tried replacing the motherboard (used a ASUS P5B SE before) next because I thought it was a sound card problem. It wasn't. I tried the GPU in a different PC because I thought it was a broken graphics card. It worked perfectly fine in the other PC. I thought it might be interference, but moving the audio cable around changes absolutely nothing. I tried using an HDMI cable instead and that did work, but is not an option since my TV has only one HDMI input and I need that for my PS3.

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• Checkpoint - Routing into the tunnel

  - by Fake4d

  I have a simple question for my checkpoint infrastructure. Do i have to route a net which i wanna access over a configured firewall VPN Tunnel. Explanation: I have two firewalls connected over a VPN which have several nets behind them. I need to access a new net at the other firewall and put them in their encryption Domain. Now here is the question: Do i have to route it in the operating system (SecurePlat)? Thanks!

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• NAT via iptables and virtual interface

  - by Alex

  I'm trying to implement the following scenario: One VM-host, multiple guest VMs, each one gets its own IP-address (and domain). Our server has only one physical interface, so the intended use is to add virtual interfaces on eth0. To complicate our situation the provider uses port-security on their switches, so I can't run the guest interfaces in bridged mode, because then the switch detects a "spoofed" MAC-address and kills the interface (permanently, forcing me to call the support, which I'm sure will get them a little bit angry the third time ;) ). My first guess was to use iptables and NAT to forward all packages from one virtual interface to another one, but iptables doesn't seem to like virtual interfaces (at least I can't get it to work properly). So my second guess is to use the source IP of the packages to the public interface. Let's assume libvirt creates a virbr0-network with 192.168.100.0/24 and the guest uses 192.168.100.2 as IP-address. This is what I tried to use: iptables -t nat -I PREROUTING --src public_ip_on_eth0:0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.2:80 That doesn't give me the intended results either (accessing the server times out). Is there a way to do what I'm trying to do, or even to route all traffic to a certain IP on a virtual interface to the VM's device?

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• Size of modules within initrd

  - by LiKao

  I am currently trying to manually replace the kernel within ubuntu-core on an embedded device with a custom kernel. However when I try to update the initrd my initrd becomes much bigger. Here is what I did: Extract the initrd that was shipped with ubuntu Make a list of all modules within the old initrd get the same modules from the new module director at /lib/modules/new_kernel_version add these modules to the initrd and remove the old ones If I do this my initrd becomes quite bigger than the original one, so I checked the individual modules. I picked the btrfs.ko filesystem driver as an example. So by comparing these two modules I noticed the one I just picked into the initrd was much bigger, which caused the difference in size. -rw-r--r-- 1 root root 999K Nov 14 15:06 btrfs.ko For the btrfs.ko within the shipped initrd. -rw-r--r-- 1 root root 7.2M Nov 14 15:08 btrfs.ko For the new btrfs.ko. What is different between these two modules? Could this be caused by some faulty setting for the new kernel? When producing the kernel I copied /proc/config.gz and used make oldconfig to update it, so all optimisations should be the same for both kernels. Or is there something else which is being done to the modules before they are put into the initrd? Maybe is there even some better way to build a new initrd for the new kernel in ubuntu altogether. Update: I just also tested with an initrd which I created from scratch using the mkinitrfs command within ubuntu, and it has the same size difference that I found for the initrd I manually updated.

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• SIGINT and SIGTSTP ignored by most common applications

  - by Vašek Potocek

  After the last upgrade to my Fedora, a strange behaviour started occurring in X terminal applications. I can't seem to stop any process using Ctrl+C, it just results in printing ^C to the console. Similarly, Ctrl+Z prints ^Z and the process goes on. Both work well in non-graphical virtual consoles. I checked stty -a and it seems perfectly normal: speed 38400 baud; rows 24; columns 80; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = M-^?; eol2 = M-^?; swtch = M-^?; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0; -parenb -parodd cs8 hupcl -cstopb cread -clocal -crtscts -ignbrk brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc ixany imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke This is independent of the terminal (gnome-terminal, XFCE4 terminal, xterm). I later noticed that it may not be caused by the terminal at all: INT or TSTP sent directly to the respective process are ignored, too. This comprises various applications I used to terminate using Ctrl+C on a regular basis (and which often don't have any better means of exiting): cat, find, tail -f, java, ping, mplayer when stuck on a broken file... Even bash ignores Ctrl+C when I want to break a command line I have been entering and then changed my mind (no ^C is printed in this case). I need to delete it character by character (of which there may be hundreds if filename completion has been used) or intentionally run the unwanted command. Strangely enough, vim does recognize Ctrl+C—just to say its "use :quit", of course. This is extremely annoying and prevents me from working efficiently. Everything had been working until lately, maybe a week ago or so. I can not find any possible causes in Google, perhaps I'm trying wrong search terms or misidentifying the main problem. What could be it and how could I revert the standard behaviour, please? Update Ctrl+Z works sometimes. It seems that in the very first terminal I launch after logging in it stops the running command but stops working after that.

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• Dealing with SMTP invalid command attack

  - by mark

  One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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• why page is automatically redirecting to some other sites

  - by raj

  In my browser (Firefox 10.0.7) the page is automatically redirect to some other sites without clicking any link. If I enter the superuser.com url after pressing Enter button, It redirect to some other sites. sometimes while refreshing also the page is redirect to some other site. It's redirecting to this sites http://result.seenfind.com/ncp/Default.aspx?term=gatlinburg%20cabin&u=1000670913 http://search.cpvee.com/search.php?q=gatlinburg+cabin&y=&f=2168&s= http://www.insidecelebritygossip.com/ I cleared all history and all but still same problem. I am using CentOS 6.3

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• Why is my server using so much memory?

  - by Qasim

  I haven't even set up my website on my dedicated server so I'm the only one using it at the moment. And yet this is what I see in my sys info: Full Size I just got a bunch of security softwares installed today so I'm wondering if that could be the reason. Programs like Dos deflate, CSF firewall, Mod_security, SIM, Log watch, etc. My server's details: CentOS Processor Intel Xeon CPU X3220 CPU Speed 2.39 GHz Cache Size 4.00 MB RAM 2GB DDR2

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• When using gt5 in my home directory I get a blank page.

  - by MT

  When using gt5 in various directories on my system (including my home directory) I get blank results. If I limit the max-depth enough, I get results. For example, in my home directory 'gt5 --max-depth 2' produces a listing, while 'gt5 --max-depth 3' produces a blank page. I've noticed that the temporary html file that gets created in tmp (such as '/tmp/gt5.9035.kJVM08Y9/gt5.html' is a zero-byte file. I can successfully do a du in the same directory (which is what I thought gt5 was using), so I'm not sure what to check?

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• Batch converting video from avc1 to xvid

  - by Tommy Brunn

  I need a way to batch convert 720p video files from avc1 to xvid in Ubuntu 10.04. I'm not terribly concerned about file size, but I do wish to retain the picture quality as much as possible. I believe the audio is encoded as aac, which is fine for my purposes. What would be the best and easiest way to do this? I've tried using Handbrake. During my first attempt, I had it using ffmpeg to convert to MPEG-4, but that just gave me a super-low quality video at twice the file size. Trying h.264 now, so we'll see how that works out. But just in case it doesn't pan out so well, what other ways do you recommend? I was thinking I'd write a bash script to reencode the files one by one, but the problem is that I have very little knowledge about codecs and containers and whatnot - so I wouldn't know what parameters I would pass ffmpeg/mencoder.

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• KVM-Guest does not boot: qemudParsePCIDeviceStrs

  - by markus

  I have a Server running Ubuntu 10.10 Server-Edition kvm, and libvirt (both ubuntu-native packages) HDD-Partitioning was done with LVM. Then I created some VMs with Virt-Manager and assigned LVM-Volumes to the VMs. Now the VMs do not boot. Virt-Manager shows a CPU-Usage of 100% for this Guest and the VNC-Connection states Booting from Hard Disk The VM-specific logfiles do not show any abnormality only syslog shows a warning warning : qemudParsePCIDeviceStrs:1422 : Unexpected exit status '1', qemu probably failed What can I do to find the error?

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• Server unresponsive, messages shown on console but not in log files

  - by raistlin majere

  I'm using Ubuntu Server 10.04.4, and once in a while the server hangs (once a month) and is totally unresponsive. The tty is flooded with messages like these. The problem is that these messages are not in my log files after reboot. How to log these messages so that I can analyze them later? In the current logs I can't see anything that would tell me why this is happening. I would also appreciate if anybody can tell from those messages what's going on. This server is a guest virtual machine. The host server is also Ubuntu server 10.04 with KVM/QEMU.

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• Any good resources on setting up an ubuntu virtual machine for web development?

  - by Relequestual

  I'm currently on my placement year at uni with 4 months left. Before working at my current place, I have not used a nix environment for web development and have used WAMP. Over the past year I have found some very interesting new tech that requires a bit more than my shared hosting even to play with (eg node.js, RoR 3). At work we use a Virtual Machine for development, but that's all been set up and configured to match the live servers, and is managed with a Puppet server. Are there any really good resources for setting up and configuring an Ubuntu VM as a web server? Work currently uses Ubuntu so I would assume this is a good OS to use. I do of course know how to use google, but the noise ratio is just too big, so thought I'd ask here, as I know many of you will have a ton of bookmarks. Cheers.

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• Apache configuration FollowSymlinks- Apply to php scripts?

  - by Josh

  I have Options set to none for my webroot directory. I also have a symmlink /var/coderoot - /var/webroot/coderoot In the php script I can do include("/var/coderoot/file"); and it works fine. Regardless of the option (yes I save and restart apache.) Does follow symlinks only apply to symlinks used in a certain way? Is there a performance loss using the include with a symmlink?

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• Is it a good idea to put "screen -r" in my .bashrc?

  - by marcusw

  I'd like to use screen to keep ssh sessions alive on my server. It would be nice if I could automatically resume any running session for my user when I log in. The straightforward way to do this would be adding "screen -r" to my .bashrc, and this seems to work fine. I'm just wondering if this will break anything under conditions which I haven't tested yet. Anyone with experience here who can tell me whether this is what I should do?

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• How to configure sendmail to relay through a specific server

  - by ErebusBat

  I have a tiny home server setup behind my cable modem (bresnan communications). I want to be able for this box to send out email (not receive) for notifications and whatnot. What I have already done: I have installed and configured sendmail. I have added mail.bresnan.net as my SMART_HOST directive. What I belive the problem is When I attempt to send an email I get the following in my mail log: Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: from=aburns, size=140, class=0, nrcpts=1, msgid=<[email protected]>, relay=aburns@localhost Dec 22 10:24:17 batcave sm-mta[1531]: oBMHOHWZ001531: from=<[email protected]>, size=397, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: to=<[email protected]>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30140, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBMHOHWZ001531 Message accepted for delivery) Dec 22 10:24:18 batcave sm-mta[1517]: oBMH9mVv001357: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:14:30, xdelay=00:00:42, mailer=relay, pri=300339, relay=pmx0.bresnan.net. [69.145.248.1], dsn=4.0.0, stat=Deferred: Connection timed out with pmx0.bresnan.net. You can see where the message is accepted for delivery by my sendmail server, then where it attempts to hand off to bresnan's server and it timesout. This is where my question is. Asstute readers will notice that pmx0.bresnan.net is not what I have my SMART_HOST directive set as. This is the (outside?) MX server for the bresnan.com/net domain. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail.bresnan.net server (which I can connect to). The problem is that I don't know how to tell sendmail to use this server and not the domain. What I have tried Setting a hosts entry so that the pmx0 server points to the mail IP address. This doesn't work, which makes sense as sendmail is obviously doing an MX query to find the server which returns the IP so there is never a need to do a 'normal' DNS resolve so the hosts file never gets involved.

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