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• Network Access via Terminal

  - by HamdiKavak

  I have a weird problem. Here is my configuration. I installed VirtualBox on Windows 7 PC. I installed Ubuntu 10.04 on VirtualBox. I installed many programs via terminal and I can still install. My browser can connect to internet. But I cannot ping any website e.g. google.com. I cannot download anything from git.I can only ping 192.168.1.1 that is all. What would be the reason guys? UPDATE I can ping with another internet connection which I use in office.

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• Would firewire networking be better than 100Megabit ethernet?

  - by Josh

  My office network has a fully switched 1000Megabit ethernet network. I have an Apple iMac with a Gigabit NIC and FireWire, and a Compaq laptop with a 100Megabit NIC and a 4-pin FireWire interface. Accessing my office's shared drives using my laptop is (obviously) much loswer using my laptop than my iMac. Would I see a noticeible performance boost if I enabled Internet Connection Sharing on my iMac and shared the private ethernet network from my iMac with my laptop over FireWire? FireWire is 480Mbit/sec, right? So would I see roughly 4x speed improvement with such a setup?

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• "postgres blocked for more than 120 seconds" - is my db still consistent?

  - by nn4l

  I am using an iscsi volume on an Open-E storage system for several virtual machines running on a XenServer host. Occasionally, when there is a very high disk I/O load on the virtual machines (and therefore also on the storage system), I got this error message on the vm consoles: [2594520.161701] INFO: task kjournald:117 blocked for more than 120 seconds. [2594520.161787] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162194] INFO: task flush-202:0:229 blocked for more than 120 seconds. [2594520.162274] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162801] INFO: task postgres:1567 blocked for more than 120 seconds. [2594520.162882] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. I understand this error message is caused by the kernel to inform that these processes haven't been run for 120 seconds, most likely because a disk access to the storage system has not yet been processed. But what is the effect on the processes. For example, will the postgres process eventually write its data when the storage system is idle again after a few minutes, so that all data is still consistent? Or will it abort the write, leaving some tables in an inconsistent state? I certainly expect that the former should be the case - if the disk access is slow, postgres (or any other affected process) should just wait as long as it takes. I can live with the application hanging for a few minutes. But if there is a chance for data corruption then any of these errors is really bad news. Please advise what to do here.

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• Terse, documented, correct way to create Kerberos-backed user shares in Greyhole

  - by MrGomez

  As a migration strategy away from Windows Home Server (which is currently out of support and intractable for our needs, for a variety of reasons), our little cloister of nerds has targeted Greyhole for our shared use at home. Despite the documentation's terseness, getting the system set up for simple, single-user operation isn't especially difficult, but this scenario fails to service our needs. Among other highlights of the system, we're attempting to emulate Integrated Windows Authentication (with Kerberos) and single-user shares to keep the Windows users in the house happy and well-supported. I'm aware of the underlying systems that go into Greyhole and understand how to set up per-user shares in Samba, but the documentation doesn't seem to support cases for Greyhole to sop up these directories as separate landing zones for replication. Enter my question: are both of these cases (IWA user authentication and user-partitioned personal shares) supported by Greyhole? If so, please cite or link the supporting documentation if it exists.

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• debian modem problems !!!

  - by Raafat

  hay there guys ... I'm a new Debian user, it looks like a very good choice 4 me, every thing is stable, free and easy to use. the problem is, I'm using my modem to establish a dial up connection to the internet (ppp) (a very old stupid way I'm forced to use for now), and using the KPPP application to do that, and nothing is working properly for me. it seems like it didn't recognize my modem or something. i already tried to make a few stuff, and now i know my modem is on /dev/tty0, so i made a link for that on /dev/modem, and query the modem using KPPP and it responded with something like: Ati : Ati0: Ati1: ... ... Ati7: with a textBox to fill up in front of each one of thees Atis, and now, when i press connect on kppp, it says modem ready, and that's it. BTW, my modem is MDC AC'97 any suggestions pleas ....

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• using sed, how to change the text on line seven to read seventh?

  - by Steve

  using sed, how to change the text on line seven to read seventh? Steve Blenheim:238-923-7366:95 Latham Lane, Easton, PA 83755:11/12/56:20300 Betty Boop:245-836-8357:635 Cutesy Lane, Hollywood, CA 91464:6/23/23:14500 Igor Chevsky:385-375-8395:3567 Populus Place, Caldwell, NJ 23875:6/18/68:23400 Norma Corder:397-857-2735:74 Pine Street, Dearborn, MI 23874:3/28/45:245700 Jennifer Cowan:548-834-2348:583 Laurel Ave., Kingsville, TX 83745:10/1/35:58900 Jon DeLoach:408-253-3122:123 Park St., San Jose, CA 04086:7/25/53:85100 Karen Evich:284-758-2857:23 Edgecliff Place, Lincoln, NB 92743:7/25/53:85100 Fred Fardbarkle:674-843-1385:20 Parak Lane, Duluth, MN 23850:4/12/23:780900 Lori Gortz:327-832-5728:3465 Mirlo Street, Peabody, MA 34756:10/2/65:35200 Paco Gutierrez:835-365-1284:454 Easy Street, Decatur, IL 75732:2/28/53:123500 Ephram Hardy:293-259-5395:235 CarltonLane, Joliet, IL 73858:8/12/20:56700

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• How to get top command output to show rake arguments?

  - by wbharding

  In the past, all of our servers have automatically shown command arguments passed to rake when we view them in top. For example: But on this particular server, we get this instead (picture is top running, showing the rake command, but not showing any of the arguments that had been passed to rake): Both servers are running Ubuntu (though the server without rake commands is a newer flavor of ubuntu). Both run rake through ruby enterprise edition (as powered by rvm). Can't seem to find any documentation on how top chooses what to show in the "command" column, other than the obvious "more data/less data" toggle (all screenshots are shown with the extra data enabled. Anyone encountered anything similar to this?

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• brctl Not working fine with bridging eth0 and at0

  - by Passi0n

  I made an access point with airbase-ng and its at0 I tried to bridge my eth0 and at0 by brctl addbr demo brctl addif demo eth0 brctl addif demo at0 brctl demo up dhclient3 demo & already removed eth0 ip so when i use ping 192.168.1.1 -I eth0 theres no reply but if i use ping 192.168.1.1 -I demo it works!!! In browser internet works fine so when i connect my android with at0 (access point) it should same work. but its now working at all :(

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• User and group permissions in access.conf

  - by Maddie

  How do I configure access.conf so that the following rule is applied? : Allow the user dia to connect from 192.152.100. Deny the user sim to connect from 192.152.100. Particularity : both the users dia (uid = 8389753) and sim (uid = 500) belong to the group sim (gid = 500) Yes, the user and group sim have the same name and the same id. With the follwing syntax, - : sim : 192.152.100. the user sim is denied, as well as dia (because dia belongs to the group sim). access.conf considers sim as being both the user and group. How do I specify that I want to deny the user sim, but at the same time allow the user dia ?

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• Where are ethernet errors logged?

  - by Matt

  Munin is showing me a graph like this: During that spike, I was unable to access my server through the eth0 port (I could access it through my IPMI port). I'm trying to figure out what happened, but I can't seem to locate any log files for eth0. I don't see anything in /var/log/(kern|syslog|messages) that is out of the ordinary. And I don't see a log file specifically for eth0. Are there logs for eth0, and if so, where can I find them? I am running Ubuntu 10.04 LTS.

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• How can I force a MySQL table to become corrupted?

  - by Rory McCann

  I have written a simple Nagios plugin that calls mysqlcheck (which checks for corrupted tables) and will give a warning if any are corrupt. However none of my tables are corrupt now. So I'm not 100% sure that my plugin is working fine. I have a dev server that's not misson critical. How can I force one (or any) of the tables there to be corrupt so that I can test my nagios alert? For the record the server is Ubuntu Dapper and the mysql is version 5.0

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• Trouble with apache saarting on boot with ssl api key

  - by molleman

  Im Running on Centos, the trouble is when i restart my server i need to start my apache and varnish service I use this to start both of them service httpd restart && service varnish restart But i would likw both of them to start when i reboot the server I read i could use this chkconfig httpd on But this is only for apache could i do this chkconfig varnish on Finally when i do y usual start of httpd , i am asked for my api key for SSL , am i able to incorporate this into resarting both varnish and httpd on start up. Or am i doomed to run this command everytime i resart

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• Unable to start tomcat6: Java error (Exception in thread "main")

  - by Nyxynyx

  After installing tomcat6 on CentOS 6.3, I am unable to start tomcat6 server. root@host [/var/log/tomcat6]# service tomcat6 start Starting tomcat6: [ OK ] Although it says OK, I cant access http://mydomain.com:8080. catalina.out Exception in thread "main" java.lang.NullPointerException at java.lang.VMClassLoader.defineClass(libgcj.so.10) at java.lang.ClassLoader.defineClass(libgcj.so.10) at java.security.SecureClassLoader.defineClass(libgcj.so.10) at java.net.URLClassLoader.findClass(libgcj.so.10) at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.10) at java.lang.ClassLoader.loadClass(libgcj.so.10) at java.lang.ClassLoader.loadClass(libgcj.so.10) at gnu.java.lang.MainThread.run(libgcj.so.10) Tomcat6 was installed using yum: yum -y install java tomcat6 tomcat6-webapps tomcat6-admin-webapps When I tried to find the version: tomcat6 version: Exception in thread "main" java.lang.NoClassDefFoundError: org.apache.catalina.util.ServerInfo at gnu.java.lang.MainThread.run(libgcj.so.10) Caused by: java.lang.ClassNotFoundException: org.apache.catalina.util.ServerInfo not found in gnu.gcj.runtime.SystemClassLoader{urls=[], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}} at java.net.URLClassLoader.findClass(libgcj.so.10) at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.10) at java.lang.ClassLoader.loadClass(libgcj.so.10) at java.lang.ClassLoader.loadClass(libgcj.so.10) at gnu.java.lang.MainThread.run(libgcj.so.10) Any idea what I should do? Thanks!

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• Sharing disk volumes across OpenVZ guests to reduce Package Management Overhead

  - by andyortlieb

  Is it feasible to create a single "master" OpenVZ guest who would only be used for package management, and use something like mount --bind on several other OpenVZ guests sort of trick them into using the environment installed by the master guest? The point of this would be so that users can maintain their own containers, and yet stay in sync with the master development environment, so they'll always have the latest & greatest requirements without worrying too much about system administration. If they need to install their own packages, could put them in /opt, or /usr/local (or set a path to their home directory)? To rephrase, I would like several (developer's, for example) OpenVZ guests whose /bin, /usr (and so on...) actually refer to the same disk location as that of a master OpenVZ guest who can be started up to install and update common packages for the environment to be shared by all of this group of OpenVZ guests. For what it's worth, we're running Debian 6. Edit: I have tried mounting (bind, and readonly) /bin, /lib, /sbin, /usr in this fashion and it refuses to start the containers stating that files are already mounted or otherwise in use: Starting container ... vzquota : (error) Quota on syscall for id 1102: Device or resource busy vzquota : (error) Possible reasons: vzquota : (error) - Container's root is already mounted vzquota : (error) - there are opened files inside Container's private area vzquota : (error) - your current working directory is inside Container's vzquota : (error) private area vzquota : (error) Currently used file(s): /var/lib/vz/private/1102/sbin /var/lib/vz/private/1102/usr /var/lib/vz/private/1102/lib /var/lib/vz/private/1102/bin vzquota on failed [3] If I unmount these four volumes, and start the guest, and then mount them after the guest has started, the guest never sees them mounted.

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• multicast tcpdump and subscriptions

  - by Karoly Horvath

  From the multicast howto: IP_ADD_MEMBERSHIP. Recall that you need to tell the kernel which multicast groups you are interested in. If no process is interested in a group, packets destined to it that arrive to the host are discarded. If you don't do that, you won't see those packets with tcpdump. Is it possible to subscribe to all multicast traffic so I can do a tcpdump for all existing traffic? I would think IGMP doesn't allow this, so probably not.. but maybe you can configure a switch to still send all multicast traffic. Is that possible? Is it possible to do subscription (for a specific IP) with a command line tool? (note: I know how to do this in C.. but would prefer to use an existing tool and not compile a separate program for this)

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• Copying symbolic links and filenames with special characters to NAS

  - by Mr E

  I have a new Western Digital My Book Live NAS. I am trying to copy files from an old drive to the NAS. I'm using Ubuntu 12.04 and I've mounted the drive by browsing the network in Nautilus and choosing a shared folder configured on the NAS. The shared folder is then automatically mounted at .gvfs/files on mybooklive. There are two problems so far: File names and directory names containing certain characters (e.g. : or |). Attempting to copy these results in the error message: cp: cannot stat `/path/to/destination.filename': Invalid argument Symbolic links. In Nautilus I get the error message: Symlinks not supported by backend My questions are: Can I connect to the NAS or configure the NAS so that I can copy my files without this problem? (In case it matters, I don't need Windows compatibility.) If not, what can I do to identify all the problem files? Can I do anything to automatically fix my filenames Please let me know if any of this needs clarification. I'm not too familiar with all of this so I may have left out some useful information.

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• Search all files containing text

  - by enthdegree

  With Busybox, how do you search for an expression within a bunch of files recursively through a bunch of directories, but only look through text files? We don't know what the file's suffix is going to be; it could be .sh, it could be nothing, it could be something else. I was considering somehow basing the search on encoding although I am not quite sure what the encoding would be either. I've tried busybox grep -r but it searches through binary files too, which wastes a lot of time.

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• how do I create a new git repository with turnkey redmine?

  - by Ali Shafai

  I have downloaded the Turnkey's redmine VM and it's running finr (I can create new projects and wikis and document lists etc etc). only thing is I can't make it to use my new git repos. I found this link, but it didn't help. any help appreciated.

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• Multiple VM environment for developing/testing

  - by Hippo

  I was asked to create a setup for automated deployment, configuration, installation/updates of websites. A bunch of small websites will be bundled on one server. If more website will come up a new server will be created... I decided to us chef for this task. All servers will be running Ubuntu at the same version and configuration. The actual question: Everything needs to be tested properly before starting live deployment, so my question is: What is the best virtualisation tool to run multiple (5 - 10) virtual machines on a Ubuntu Laptop? Requirements: easy setup, fast (clone/snapshot of VMs) All VMs should be easily connected to the internet and should be able to communicate to each other (Open-Source / free would be great) So far I looked into: Virtual box is more for Desktop virtualisation, Cloning not possible, every new machine needs to be installed VMware Player Any suggestions? If there are any question about what I am doing please comment on this question, I will answer as soon as possible. This question is not about the actual set up, it is about a nice working environment.

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• What else is needed to get iptables to log into this file I created?

  - by anthony01

  I want to create the logging of iptables DROP's and intrusion attemps. First, I put --log-prefix "iptables: " at the end of every iptables rules in my iptables rules file. But this doesn't work, as it says there is a syntax error. So where should I put that command? (I would want to have it included in the saved rules file) Secondly, I created a file iptables.conf within /etc/rsyslog.d/, and I put the following inside of it: :msg, startswith, "iptables: " -/var/log/iptables.log & ~ I assume that at this stage, I'm supposed to restart the rsyslog daemon. What else is needed to do what I'm attempting? Thanks a lot

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• rdfii-backup command view backedup files

  - by Hulk

  We are using rdiff-backup command to make incremental backups.My question is that how to view the files in a particular backup i.e, .gz file Also how to recover all the files in a particular gz file

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• Why do Ping and Dig provide different IP address than nslookup?

  - by user1032531

  When pinging my domain name which points to my home public IP from two different servers on my LAN, it shows them pinging different IP. Further investigation shows dig and nslookup providing different results. See below. A little history. My IP used to be 11.22.33.444 and is hosted by Comcast. I changed routers, and it somehow got changed to 55.66.77.888. I've since updated my 1and1 domain name to point to the 55.66.77.888. desktop is a basic server, runs the web server, and connects wirelessly to my LAN. laptop is a GUI and connected via CAT5. Both operate Centos6.4. My old router was a D-Link, and used their "Virtual Server" feature to pass port 80 to desktop. My new router is a Linksys, and I use their "Port Forwarding" feature to pass port 80 to desktop (however, I haven't gotten this part working yet). What is going on??? Why the different IPs? Obviously, it most somehow be stored on the server, but why does the actual machine even know the public IP since it is on a LAN? How do I purge the old IP? [root@desktop etc]# dig +short myDomain.com 11.22.33.444 [root@desktop etc]# nslookup www.myDomain.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: www.myDomain.com Address: 55.66.77.888 [root@desktop etc]# dig myDomain.com ; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.6 <<>> myDomain.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13822 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;myDomain.com. IN A ;; ANSWER SECTION: myDomain.com. 16031 IN A 11.22.33.444 ;; Query time: 21 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon Oct 21 04:36:52 2013 ;; MSG SIZE rcvd: 44 [root@desktop etc]# [root@laptop ~]# dig +short myDomain.com 55.66.77.888 [root@laptop ~]# nslookup www.myDomain.com Server: 192.168.0.1 Address: 192.168.0.1#53 Non-authoritative answer: Name: www.myDomain.com Address: 55.66.77.888 [root@laptop ~]#

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• procfs and youtube flash video

  - by trideceth12

  Up until recently (about 3 months ago), ALL open flash videos had deleted file handles in the procfs virtual folder for the flash plugin, I could see them thus: ps x|grep flash cd /proc/#PROCESS#/fd ls -l cp #FILE# ~/ This still works for the vast majority of flash video, but some YouTube videos no longer keep this open file handle. My questions are: A) Why not? B) Where are these files now stored? C) How can I get this file Yes I know I could probably get a browser plugin, it just annoys me that they are hiding these files so I want to keep doing it the hard way.

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• USB To Serial under OpenSuse 11.3

  - by Exsisto

  I have a LogiLink USB-To-Serial adapter. This has the PL2303 chip inside. When I insert the device: [26064.927083] usb 7-1: new full speed USB device using uhci_hcd and address 9 [26065.076090] usb 7-1: New USB device found, idVendor=067b, idProduct=2303 [26065.076099] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [26065.076105] usb 7-1: Product: USB-Serial Controller [26065.076110] usb 7-1: Manufacturer: Prolific Technology Inc. [26065.079181] pl2303 7-1:1.0: pl2303 converter detected [26065.091296] usb 7-1: pl2303 converter now attached to ttyUSB0 So the device is recognized and the converter is attached to ttyUSB0. When I do screen /dev/ttyUSB0 9600 I get the error: bash: /dev/ttyUSB0: Permission denied So I went looking in the file permissions. ls -l from the /dev folder reports: crw-rw---- 1 root dialout 188, 0 2011-04-26 15:47 ttyUSB0 I added my user lars to the dialout group. When I use the commands groups under lars it shows that I'm in the group. Though I still recieve the permissions denied error, as lars, and as root. I'm trying to connect to a console cable to configure some Cisco switches. My OS is OpenSuse 11.3 x86_64 with kernel version 2.6.34.7-0.7-desktop.

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• Is it possible for root to execute a command as non-root

  - by adnan kamili

  I am root user and suppose i want to run any application as another user. is it possible, without switching to another user. Something like # google-chrome user=abc I am actually executing a cli program as a non root user. I have set the sticky bit on and i am using setuid. So the program runs with root privileges. Now i am using system() with in the program to invoke gui app. But i dont want to run it as root. so i want to temporarily drop root privileges only for that call.

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