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• Change to different user, or let different user execute a command

  - by WG-

  I have a problem. There is a server which I can access with an account by ssh, lets say WG. Now there is a folder with the following permissions. drwxr-s---+ 855 vvz www-data 20K Aug 21 17:56 pictures I want to copy this folder using rsync, however since I am not the user www-data but WG I cannot execute rsync. So I want www-data to execute a rsync command. However, I do not posses sudo powers. My friend however tells me that I am actually able to execute the rsync command as www-data, but he will not tell me how. I asked him for some clues and he told me that it had something to do with reverse shell (which I figured out to be that you connect by ssh to your server and then you connect back to your own server, or something). I also asked if it was by-design or actually a flaw in the system. He tells me it is both. Furthermore I think it has something to do with the group permissions. If I just make sure that I am with the group permissions then I can also read the files. Anybody has a clue?

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• iptables blank after reboot

  - by theillien

  We've started encountering an issue with iptables on our RHEL 6.3 systems in that after a reboot, when the service starts, the rules are not loaded. We get the empty ruleset: [msnyder@matt-test ~]$ sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination This is in spite of the fact that we have rules defined and the service is, indeed, running. That I know because when I run service iptables start it simply drops back to the prompt. If I run service iptables restart it actually stops and then restarts the service. And, of course, if I run service iptables stop it indicates that iptables is actually stopping. Knowing that I need to restart the service, I do so and the rules load up properly. They simply don't get loaded after a reboot. Unless they get loaded differently during a reboot I don't see how our rules would be wrong. If they were, they wouldn't even load during a service restart. Has anyone else ever encountered this? EDIT: The rules are already saved in /etc/sysconfig/iptables. They are not added on the fly from the command line so service iptables save is unnecessary.

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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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• Recurring Apache 2.0.52 error on CentOS 4 - 'could not create `rewrite_log_lock`'

  - by warren

  I have been seeing a recurring issue on my web server: [Sun May 16 03:10:19 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 04:10:05 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 05:10:04 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 05:17:13 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed So far, the only fix I have found to this when it happens is to reboot my server. This is non-ideal :-\ Restarting httpd does not clear the error. df indicates I have 20+ gigs free, and top and free both report 800+ megs (or 1.2 gigs) > df -h Filesystem Size Used Avail Use% Mounted on /dev/simfs 40G 18G 23G 44% / # > free total used free shared buffers cached Mem: 1474560 300832 1173728 0 0 0 -/+ buffers/cache: 300832 1173728 Any ideas on why this would recur, and how to prevent/fix it?

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• No rule to make target libmysql.c', needed bylibmysql.lo'. Stop

  - by user1711008

  I install mysql5.1.53, run #./configure is well, but run #make have this error. My system is centos5.8, gcc version 4.1.2 20080704 (Red Hat 4.1.2-52) make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql' make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql' Making all in libmysql_r make[1]: Entering directory /root/soft/mysql-5.1.53/libmysql_r' make all-am make[2]: Entering directory/root/soft/mysql-5.1.53/libmysql_r' make[2]: * No rule to make target libmysql.c', needed bylibmysql.lo'. Stop. make[2]: Leaving directory /root/soft/mysql-5.1.53/libmysql_r' make[1]: *** [all] Error 2 make[1]: Leaving directory/root/soft/mysql-5.1.53/libmysql_r' make: * [all-recursive] Error 1

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• Debian 5.0.8 won't detect my ethernet adapter

  - by PaulH

  I'm installing Debian 5.0.8 on a Dell Latitude E6410 using the network install x86 CD. Unfortunately, it won't detect my Ethernet adapter. Specifically, I get the error: No Ethernet card was detected. If you know the name of the driver needed by your Ethernet card, you can select it from the list. lspci shows: 00:19.0 Ethernet controller: Intel Corporation Device 10ea (rev 05) That should correspond to the e100e driver. But, if I select it from the list, the install CD still fails to detect it. Ubuntu 10.10 and Windows 7 are able to use this device with no problem. Does anybody know what I can do to make Debian use my Ethernet adapter? Thanks, PaulH

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• RHEL 5.3 Kickstart - How specify location of individual package in Workstation folder?

  - by Ed

  I keep getting "package does not exist" errors during the install. I made a kickstart ISO to create an unattended install of a RHEL 5.3 build machine for C++ software releases. It pulls the kickstart config file from our internal web server. This is handy; it makes it easy to test and modify without having to make a new ISO. And I plan to check it in to version control if I can get it working. Anyway, the rpm packages are located in two folders on the disk; Client and Workstation. The packages install fine for the ones that are physically located under the Client folder. It cannot find those under the Workstation folder such as as doxygen and subversion complaining that packages do not exist. Is there a way to specify the individual package location? # ----------------------------------------------------------------------------- # P A C K A G E S # ----------------------------------------------------------------------------- %packages @gnome-desktop @core @base @base-x @printing @development-tools emacs kexec-tools fipscheck xorg-x11-server-Xnest xorg-x11-server-Xvfb #Packages Located in Workstation Folder *** Install can not find any of these ?? bison doxygen gcc-c++ subversion zlib-devel freetype-devel libxml2-devel Thanks in advance, -Ed

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• Migrating to ssh key authentication; implications of adding sbin's to users $PATH

  - by ancillary

  I'm in the process of migrating to key's for authentication on my CentOS boxes. I have it all set up and working, but was a bit taken aback when I noticed service (and other things) didn't work the way I was accustomed to. Even after su'ing to root, still had to call the full path for it to work (which I assume to be expected/normal behavior). I also assume this is because there are different $PATH's for root (what I was using and am used to) and the newly created, key-using user. Specifically, I noticed the sbin's of the world missing from the user path. If I were to add those paths (/sbin/,/usr/sbin/,/usr/local/sbin) to a profile.d .sh script for this new key-loving user, would: I be opening up the system in ways I shouldn't be? I be doing something I needn't do save for reasons of laziness? I create other potential problems? Thanks.

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• ssh freezes when trying to connect to some hosts

  - by NS Gopikrishnan

  When I try to ssh to particular machine/s in a list, The SSH command happens to be freezing. I tried out setting ssh timeout. But then also it's freezes even after the timeout. In verbose mode : OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to x358.x.server.com [10.x.x.x] port 22. debug1: fd 3 clearing O_NONBLOCK debug1: Connection established. debug1: identity file /export/home/sqlrpt/.ssh/identity type -1 debug1: identity file /export/home/sqlrpt/.ssh/id_rsa type -1 debug1: identity file /export/home/sqlrpt/.ssh/id_dsa type 2 At this point it freezes. A work around I thought was to create a child process for each ssh calls and if the process doesn't respond after a timeout - Kill it. But are there any less complex ways, so that I can accommodate it in a shell script itself rather than going for a C/C++ program ?

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• Ubuntu server; Should I add a new user or not?

  - by Camran

  On my Ubuntu server, when I do everything now I do it as "root" user. So for example, logging into ftp filezilla, I enter "root" as username... Is this the way to do it, or should I create a users group and add priveliges to the users in that group? Don't know if I should create a new user or not, it works with root just fine, but I don't want any security flaws... Thanks

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• Using command line to connect to a wireless network with an http login

  - by Shane

  I'm trying to connect to a wifi network where it hijacks all requests and redirects you to a page where you have to agree to a terms of use before it lets you connect to the actual outside world. This is a pretty common practice, and usually doesn't pose much of a problem. However, I've got a computer running Ubuntu 9.10 server with no windowing system. How can I use the command line to agree to the terms of use? I don't have internet access on the computer to download packages via apt-get or anything like that. Sure, I can think of any number of workarounds, but I suspect there's an easy way to use wget or curl or something. Basically, I need a command line solution for sending an HTTP POST request essentially clicking on a button. For future reference, it'd be helpful to know how to send a POST request with, say, a username and password if I ever find myself in that situation in another hotel or airport.

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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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• Xen virtual host can reach some sites but not others

  - by Tun H S Lee

  Okay, this is killing me. Debian Squeeze, Xen 4.0, brand new install. No iptables rules whatsoever except for the ones added by the default xen bridge script. Dom0 can reach the entire world, no problems. DomU can receive packets from some hosts, but not from others. For instance, if I ping Host A, it works fine. If I ping Host B, the DomU reports 100% packet loss. The hosts are random, but consistent (even after reboots). I can see no pattern to why some work and others don't. In fact, in some cases, different virtual hosts on the same server (an other server at a different data center) are divided; some work and others do not. I can reboot (DomU or Dom0 too) and the same hosts will work or fail as before. If I tcpdump on the Host B while pinging from the DomU, everything looks fine. It sees the echo request coming in and says it's sending one back. However, if I tcpdump peth0 on the Dom0, it never sees the echo reply. Any ideas what could be happening? I'm tearing my hair out here.

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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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• Looking for advice on using dd to backup a dual boot laptop.

  - by AvatarOfChronos

  My questions boils down to this. If I do "dd if=/dev/sda of=usbdrive" can anybody confirm that this will get everything including mbr/partition information/all four partitions and create a drive that I can swap with the failing internal drive without losing anything? If this is done while the computer is running will it still copy everything? At this point I'm afraid to shutdown the computer for fear of it never starting again. Secondly, how tolerant is dd of failing drives? Has anybody used it to recover a half dead drive before that can share any potential pitfalls? Did it get the data ok or is this going to be a hope for the best kind of situation? And lastly, If the usbdrive is larger than the failing internal drive I'll still be able to expand the partitions later so I'm not losing space? this last part seems silly to ask but with my current streak of bad luck I'll end up overwriting some magic bit and forever turning a 640gb hdd into a 500gb hdd. Also if anybody has a better solution to create a complete clone that gets everything I'm all for hearing about it. PostScript: I had been making periodic backups however when whatever miasma that killed the laptop struck it also got the NAS :( Post PostScript: both devices were on a UPS system.

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• How do you enable webcam support in Facebook for Ubuntu 10.04?

  - by Jonathan

  I think I have finally arrived at an insolvable equation: Chromium v.7 + Ubuntu 10.04 + Sun Java 6 + Webcam + Facebook + Flash 10 = non-functional All of those items listed above are potential points of failure in this situation, and any help narrowing them down would be fantastic. I am simply trying to enable webcame support directly through Facebooks website. Forum searches and the usual googling turn up few posts related to this specific equation. Two of the major suggestions include: 1) Installing the Sun (I refuse to say oracle sob)-provided Java implementation instead of the OpenJDK normally installed in Ubuntu. And yes, after installing it, I did update all my default supports to use the sun commands over the openjdk. 2) Somehow enabling Facebook as a permitted site to access my webcam using Flash settings. I have not been able to explore option 2 because I cannot find a way to adjust the Flash settings in chromium 7. Other factors that do not help include the fact that I am pretty sure facebook changes its webcam interface every 10 seconds just to keep troubleshooters and support personnel on their toes. If anyone has a OTP that informs us of the next shift in the app, a leak would be greatly appreciated!

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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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• Timeout ssh sessions after inactivity?

  - by Insyte

  PCI requirement 8.5.15 states: "If a session has been idle for more than 15 minutes, require the user to re-enter the password to re-activate the terminal." The first, and most obvious, way to deal with ssh sessions that are idling at the bash prompt is by enforcing a read-only, global $TMOUT of 900. Unfortunately, that only covers sessions sitting at the bash prompt. The spirit of the PCI spec would also require killing sessions running top/vim/etc. I've considered writing a */1 cron job that parses the output of "/usr/bin/w" and kills the associated shell, but that seems like a blunt instrument. Any ideas for something that would actually do what the spec requires and just lock the terminal? I've looked at away and vlock; they both seem great for voluntarily locking your terminal, but I need a cron/daemon task that will enforce locking.

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• Create a video stream from an image

  - by skerit

  I have a network camera that is only able to give me an image, not a video stream. In my home network this image is at http://192.168.1.16/loginfree.jpg I'm able to get this image a few times per second. I would now like to be able to serve it up as a video stream so I can use it in zoneminder. Any idea as to how I do that? I've messed around with named pipes and ffmpeg's image2pipe, but I can't get it to work properly.

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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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• Rebuilding RAID1 in Ubuntu

  - by John Utech

  I had my second HD in my RAID1 come up with bad sectors. So I got another drive and pulled out the bad sector drive and put the new drive in. With the original working RAID1 drive in the computer it failed to boot. I manually copied everything from the old drive over via a Gparted Live CD. Still no booting. Kind of scratching my head here as I can see that both of the drives have data on them but are unable to get either of them to boot. I used a Ubuntu live CD and couldn't even manually mount either of the drives, which I thought was really the odd part. Not sure where to go from here.

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• Getting error while starting tomcat?

  - by ram

  For my Tomcat installation process case is 1. cd /home/mpatil/Downloads/ 2. tar zxvf apache-tomcat-6.0.37.tar.gz 3. cd apache-tomcat-6.0.37/bin 4. ./startup.sh 5. tail -f /home/mpatil/Downloads/apache-tomcat-6.0.37/logs/catalina.out for `5` command results : [root@localhost bin]# tail -f /home/mpatil/Downloads/apache-tomcat-6.0.37/logs/catalina.out Nov 08, 2013 12:04:04 PM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory docs Nov 08, 2013 12:04:04 PM org.apache.coyote.http11.Http11Protocol start INFO: Starting Coyote HTTP/1.1 on http-8080 Nov 08, 2013 12:04:04 PM org.apache.jk.common.ChannelSocket init INFO: JK: ajp13 listening on /0.0.0.0:8009 Nov 08, 2013 12:04:04 PM org.apache.jk.server.JkMain start INFO: Jk running ID=0 time=0/115 config=null Nov 08, 2013 12:04:04 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 3036 ms and i tried in browser like http://locahost:8080/ nothing comming why.whats the wrong in my command or i did any wrong in my commands pls tel me

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• What is the cleanest way to upgrade Fedora and also my individual installs while keeping /home?

  - by Don

  I am a professional programmer, using Fedora 10 (and a host of other packages individually installed). I use my system to telecommute. Every year or so, I go through the ritual dance, usually with a second computer and a KVM switch as I don't have office space for two monitors, to build the next version of Fedora and install all my favorite apps. Is there a better way? At least a nice way to keep track of what I need to 'add on' so that I don't have to manually install my app collection? Also, I keep /home on a separate raid-ed drive set so I can also fall prey to 'old-config-file-itis'.

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• using "touch" to create directories?

  - by user62367

  1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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• using "touch" to create directories?

  - by user66732

  1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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