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• How can I create persistent SSH connection to "stream" commands over a period of time?

  - by Darth

  Say that I have an application running on one PC that is sending commands via SSH to another PC on the network (both machines running Linux). For example every time something happens on #1, I want to run a task on #2. In this setup, I have to create SSH connection on every single command. Is there any simple way to do this with basic unix tools without programming custom client/server application? Basically all I want is to establish a connection over SSH and then send one command after another.

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• Samba4 advice for production use

  - by pgb

  I have an old Samba 3 + LDAP server installed that needs to be rebuilt. I'm weighting my options, and Windows Server seems too expensive at the moment, and Samba 4 appeared to be a nice option, coupled with the last Bind 9 that can dynamically add the computers to the DNS. I have about 30 workstations, so I still consider it a small network. My questions are: Is Samba 4 stable enough for production? It seems as if the Samba team is too cautious on when to call their version final, or even beta, as compared with other open source projects. What Linux distribution would you recommend to set it up? I usually use Ubuntu Server, but may use another one if installing / maintaining Samba 4 is better on that one.

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• HAProxy MySQL Failover is not starting

  - by thiesdiggity

  I am trying to setup HAProxy with MySQL failover with Ubuntu. I used a setup similar to this serverfault question, however I am getting the following error when starting haproxy: [ALERT] 341/220001 (17405) : parsing [/etc/haproxy/haproxy.cfg:29] : unknown option 'mysql-check'. [ALERT] 341/220001 (17405) : Error(s) found in configuration file : /etc/haproxy/haproxy.cfg [ALERT] 341/220001 (17405) : Fatal errors found in configuration. I even tried installing the lastest version of HAProxy (1.4.22). Does anyone know how to fix this? I have Google'd the heck out of it and can't find any solution. Thanks for your time!

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• continuous hard disk access - slowing down my machine

  - by suresh

  I find from the hard disk access LED on the front of my machine that the hard disk is being accessed more often and probably because of that, my machine is quite slow. The machine becomes unresponsive even when the load as seen from w command is around 1 or so. My desktop is optiplex 360 dell machine running Ubuntu 10.04. My questions are: How to quantify hard disk access and how to see if it is more than "normal" ? If it is more than normal, what are my solutions ? thanks suresh

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• DokuWiki Segmentation Fault On Radius Auth

  - by mrduclaw

  I'm running x64 Ubuntu 12.04. I did a simple apt-get install dokuwiki to install DokuWiki. And I'm trying to follow the directions located here: http://www.dokuwiki.org/auth:radius to get Radius authentication working. Things seemed to install OK. Under Configuration Manager I selected Authentication backend to be "Radius" and filled in the Radius details at the bottom. Now, however, whenever I try to log into the Wiki, my browser gives me the following error: No data received I checked /var/log/apache2/error.log and see this: [Tue Jul 10 22:22:14 2012] [notice] child pid 5270 exit signal Segmentation fault (11) I'm fairly sure the Radius server is setup correctly as it correctly authenticates with my squid proxy and other stuff on the network. But this is about the extent of my Linux troubleshooting skills. Can anyone suggest steps for me to follow to help track down what's causing apache2 to segfault short of attaching with gdb and issuing a set follow-fork-mode? I'm also open to just hearing suggestions for simila

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• Using the right folder for the right job. Article link, please?

  - by Droogans

  There are specific folders designed for specific tasks. /var/www holds your web sites, /usr/bin contains files to run your applications...yet I still find myself putting nearly all of my work in ~. Is it possible to overuse my home directory? Will it come back to haunt me? Anyone have a good link to an article of best practices for organizing your files so that they are placed in their "correct" place? Is there even such a thing in Linux? I am referring specifically to user-generated content. I do not compile applications from source, I use apt-get for those tasks. This article has a great introduction to what I'm looking for. Table 3-2, "Subdirectories of the root directory" is the sort of thing I'm looking for, but with more details/examples.

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• Any way to know if two ip address points to the same machine?

  - by Vivek V K

  Is there anyway to find if two different IP address in two different network actually points to the same physical device? I need it in Linux. Edit - I have the same server(a raspberry pi) connected via 2 intranets to my client. I don't know the IP address of the server as it is DHCP. The crude way to do is to reach the raspberry pi from one intranet and check with ifconfig to find the ipadress of the machine in the other Intranet. I want to know if there is any other way I can do it? I know the mac address of the machine.But I don't know how do I find the Ipadress based on the mac address.

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• performance block countries using iptables /netfilter

  - by markus

  It's easy to block IPs from country using iptables (e.g. like http://www.cyberciti.biz/faq/block-entier-country-using-iptables/). However I read that the performance can go down if the deny list get too large. An alternative is installing the iptables geoip patch or using ipset ( http://www.jsimmons.co.uk/2010/06/08/using-ipset-with-iptables-in-ubuntu-lts-1004-to-block-large-ip-ranges/) instead of iptables. Does anyone have experience with the various approaches and can say something about the performance differences ? Are there are other ways to block country IPs in linux which I did't mentioned above?

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• How do I securely execute commands as root via a web control panel?

  - by Chris J

  I would like to build a very simple PHP based web based control panel to add and remove users to/from and add and remove sections to/from nginx config files on my linode vps (Ubuntu 8.04 LTS). What is the most secure way of executing commands as root based on input from a web based control panel? I am loathe to run PHP as root (even if behind an IP tables firewall) for the obvious reasons. Suggestions welcome. It must be possible as several commercial (and bloated, for my needs) control panels offer similar functionality. Thanks

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• Internal LTO tape drive becomes hot

  - by claasz

  We use an internal LTO3 tape drive (HP Ultrium 920) in a PC (no particular server hardware) running Linux. The tape drive becomes quite hot - I don't have the exact temperature, but you may touch it for a second or two, then it hurts ;-) This happens when the tape has nothing to do (during reading/writing, it might become even hotter, I haven't checked that). Besides that, the system is working fine. Now I'm wondering Why does the tape becomes so hot? Is this something I need to care about? Is there something like a 'standby' mode for the tape? (I think it should not consume that much energy when it is not used)

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• Forward Windows Events Logs to Rsyslog

  - by SamCulley

  Thanks for taking time to read this post. Basically I would like to forward Windows Events Logs from all my desktop clients to a linux box with rsyslog on. Rsyslog provide a Windows agent to do just that but its 40 euros per license and when you have x amount of machines that cost adds up. I was wondering if there is a FOSS alternative available I have tried searching the Google but haven't managed to find anything. Hopefully someone might already faced this same problem and are using an alternative that they could recommend. Again thanks for reading, Kind Regards Sam

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• Is there a path from OpenSCAD to WebGL?

  - by Andrew Domaszek

  tl;dr version, Does a software path exist to convert from openscad input to render on a website via webgl? What I'm trying to do is display OpenSCAD created designs uploaded via post on a LEMPy driven website; this is currently done by outputting to a static png image. I would like to render one of openscad's export formats(wikibooks) and convert for display in javascript/webgl through some software path available via linux batch. CPU and RAM are relatively unconstrained but no GPU available. I've looked into CopperLeicht, but it requires CopperCube output which would require windows or wine. FOSS is preferred but not required. edit: I found three.js has converters for fbx, dae, obj, and 3ds formats which might be helpful as one of the last steps.

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• How to force laptop mode on/off

  - by Vi

  root@vi-notebook:/home/vi# laptop_mode start force Laptop mode enabled, not active How to start laptop mode? It starts successfully when AC adapter is removed, but not by explicit command. The system is GNU/Linux Debian i386 squeeze (not up to date), 2.6.30-zen2-31270-gc7099db-dirty, Acer Extensa 5220. Update: Changed to ENABLE_LAPTOP_MODE_ON_AC=1 in /etc/laptop_mode/laptop-mode.conf, now it is turned on always. But I can't turn it off with laptop_mode stop force, it stays turned on anyway. How do I turn it off again?

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• Changing linksys router configuration from command-line

  - by Dan

  I am constantly logged into (ssh'd) my home machine (ubuntu) from various remote locations. Sometimes I would like to change my home linksys router settings (change the port forwarding settings or disable/enable wireless, things like that). When I try and use the links2 text browser, there isn't much I can do because the tab titles don't show up (presumably because they are pictures?). Is there another way of configuring a linksys router from a command line? I guess my only other option is to set up a proxy on my home machine and use a browser connected to that proxy to configure it, but I would think there might be a non-browser way of doing it. Thanks

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• Problem with testsaslauthd and kerberos5 ("saslauthd internal error")

  - by danorton

  The error message “saslauthd internal error” seems like a catch-all for saslauthd, so I’m not sure if it’s a red herring, but here’s the brief description of my problem: This Kerberos command works fine: $ echo getprivs | kadmin -p username -w password Authenticating as principal username with password. kadmin: getprivs current privileges: GET ADD MODIFY DELETE But this SASL test command fails: $ testsaslauthd -u username -p password 0: NO "authentication failed" saslauthd works fine with "-a sasldb", but the above is with "-a kerberos5" This is the most detail I seem to be able to get from saslauthd: saslauthd[]: auth_krb5: krb5_get_init_creds_password: -1765328353 saslauthd[]: do_auth : auth failure: [user=username] [service=imap] [realm=] [mech=kerberos5] [reason=saslauthd internal error] Kerberos seems happy: krb5kdc[](info): AS_REQ (4 etypes {18 17 16 23}) 127.0.0.1: ISSUE: authtime 1298779891, etypes {rep=18 tkt=18 ses=18}, username at REALM for krbtgt/DOMAIN at REALM I’m running Ubuntu 10.04 (lucid) with the latest updates, namely: Kerberos 5 release 1.8.1 saslauthd 2.1.23 Thanks for any clues.

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• Postgresql init.d script not working

  - by Bram Jetten

  I installed Postgresql 8.4 on my VPS with Ubuntu 10.04. Default setup, nothing unusual. After the installation the dbserver is automatically started and is running great. The installer also sets a init.d script in place. This script however, doesn't seem to affect Postgres. $ sudo /etc/init.d/postgresql stop The above line is not stopping the server. The command does not fail or show any message. The logs won't say anything as well. After killing all postgres processes with killall I cannot get Postgres working again using the init script. When rebooting my VPS it somehow starts up and works again.

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• Couldn't dual boot Vista and Centos 5.4

  - by jack sparrow

  Hi all, Today I have installed Centos 5.4 with dual boot with Vista. Everything was fine, but after testing Centos 5.4, when I tried to load Vista, it did not load. After selecting vista from grub menu, it shows the following message: rootnoverify (hd0, 1) chainloader +1 No bootmgr found I googled and try to fix the boot but failed, Then I restart my machine, boot with vista cd and in rescue option, restore my bootmgr by typing bootrec /fixmbr What happened after that, I can load at vista now, but no grub menu shows :P It seems the Centos went totally invisible. I am using dual booting Ubuntu 9.10 and vista in my laptop and its working fine and with no error from the beginning. But installed Centos for one of my project needs and I need it running asap. So I am feeling very helpless. Please help me anyone out there. I know there are many people knows how to fix it. Please help me.. Thanks in advance.

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• Clonezilla is not able to clone a RAID 1 disk

  - by Adrian

  I have a HP Server DL320 G5. There are two SATA hard disks configured as RAID 1 through HP embedded RAID controller. Server OS is running GNU/Linux (Fedora) Server booted up with clonezilla live CD. The image will be stored on a NAS connected through NFS. Clonezilla could mount the NFS share and could see the two hard disks /dev/sda and /dev/sdb. I selected /dev/sda for disk cloning. However I could not see the cloning progress and got straight into a prompt for reboot, poweroff, command line I tried to select /dev/sdb but the same issue.

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• nginx 1.2.3 installed but remains at 1.1.19

  - by Nyxynyxx

  I've installed nginx 1.2.3 by adding a new ppa sudo add-apt-repository ppa:nginx/stable sudo apt-get update sudo apt-get install nginx However, nginx -v still gives me 1.1.19. What happened? Output The following packages will be upgraded: nginx 1 upgraded, 0 newly installed, 0 to remove and 46 not upgraded. Need to get 61.8 kB of archives. After this operation, 3,072 B of additional disk space will be used. Get:1 http://ppa.launchpad.net/nginx/stable/ubuntu/ precise/main nginx all 1.2.3-0ubuntu0ppa3~precise [61.8 kB] Fetched 61.8 kB in 0s (89.7 kB/s) (Reading database ... 79914 files and directories currently installed.) Preparing to replace nginx 1.1.19-1 (using .../nginx_1.2.3-0ubuntu0ppa3~precise_all.deb) ... Unpacking replacement nginx ... Setting up nginx (1.2.3-0ubuntu0ppa3~precise) ... root@precise64:/var/www/apadment# nginx -v nginx version: nginx/1.1.19

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• List of MD /Raid/LVM (Devices) = How to mount them without any further information available?

  - by Jens

  Hello Expets, I do not have much skills in linux and installed a system two years ago that I now had to reboot, but it seems I did not automate everything with start-scripts... My Problem: I miss some mountpoints. I have a list of my raids (excerpt:) md3 : active (auto-read-only) raid1 sda6[0] sdb6[1] 97659008 blocks [2/2] [UU] md4 : active (auto-read-only) raid1 sda7[0] sdb7[1] 250099776 blocks [2/2] [UU] and it seems md3 and md4 are NOT mounted. However i do NOT have any entries for them fstab file. What should I do next. I do NOT know which filesystem they have (most likely ext3). =Can I savely try to mount them with (mount -t ext3 /dev/md3 /mnt/mymntpoint) or will the lead to corrupted data, in case they are not ext3? What should I do next (based on the information given above). The goal is to remount these Devices again, but I do not know anything about them anymore... Thank you very much Jens

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• Can't access website on local network

  - by Romain

  I have a personal website running on my PC (Ubuntu), connected to the internet through a router. I can connect without any problem to my website when I'm not at home so I guess my router is correctly configured but whem I try to access the site using a local adress at home (192.168.XX.XX), it times out after 30 seconds or so. What tool could I use to find out where is the problem? I have tried a tracert command on my Windows PC but add just a useless line. If it's of any help, my website is running on Tomcat 6 but I don't think the problem is here as it would be weird that the server would be configured to be accessible from the internet but not the local network.

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• apache server not working after installing zend server

  - by kamal

  i have apache installed in my redhat 5.3 server machine. and i was trying to install zend server. i installed zend server with install.sh file in directory /var/zend. in my windows machine after installling zend server community edition i was able to access apache server as well as zend server. but in my linux machine localhost displays nothing and localhost:10081 shows zend server. what can i do to run my localhost? or should i seperately install apache?

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• Google Search w/ Chrome Incognito w/ Gnome Do

  - by jrc03c

  I've installed Google Chrome as my default browser in Ubuntu, and recently installed Gnome Do and enabled the Google Search plugin. The Google Search from Gnome Do works exactly as expected but for one thing: Chrome (which is typically set to open in "incognito" mode) does not open in "incognito" mode. The shortcuts on my desktop, taskbar, and menus all have the --incognito flag attached (which works just fine), but the browser refuses to open in this mode when launched from Gnome Do. Any suggestions? Also, please note the settings for the Google Search plugin in Gnome Do: It's obvious that Gnome Do just passes the Google Search blindly to the default browser. In other words, there are no configurable settings specifically for Chrome. Any thoughts?

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• Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?

  - by Don MacAskill

  On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on RAID-1. Typically, we've used md (via mdadm) to create our RAID-1 volumes, then used LVM to create volume groups, then formatted with the file system of our choice (ext4 lately). We've been doing this for years, and Google & ServerFault searches seem to confirm this is the most common way of doing software RAID with volume management. Google searches seem to suggest that dmraid is use for so-called 'fakeRAID' configurations where there's some level of hardware 'help' in the form of RAID BIOS in the controller, which we don't have (and don't want to use - we'd like a fully software solution). Since we'd like to use TRIM on our SSDs, and since md doesn't seem to (yet?) support TRIM, I'm wondering if it's possible to use dmraid instead of md to create RAID-1 (and RAID-1+0) volumes in software, with no hardware support (ie, just plugged into a dumb SATA/SAS bus)?

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