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• What may the reason of slowness be (see details in message body)?

  - by Ivan

  I've got a really weird situation I'm beating to solve. A performance problem which looks really like an empty waiting sequence set in code (while it probably isn't so). I've got a pretty powerful dedicated server (10 GB RAM, eight Xeon cores, etc) running Ubuntu 10.04 with all the functionality services (except OpenVPN server used to provide secure access to clients) deployed in separate VirtualBox (vboxheadless) machines (one for the company e-mail server, one for web server and one for accounting/crm server (Firebird + proprietary app server working with Delphi-made clients)). CPU load (as "top" says) is almost always near zero. Host system RAM is close to 100% usage but not overloaded (as very little swapping gets used, and freed (by stopping one of VMs) memory doesn't get reused any quickly). Approximately 50% of guests RAM is used. iostat usually shows near zero %util. Network bandwidth seems to be underused. But the accounting/crm client (a Win32 Delphi application run on WinXP machines) software works hell-slow with this server (and works much better using an inside-LAN Windows server). I just can't imagine what can make it be slow if there are so plenty of CPU, RAM, HDD and bandwidth resources available on clients and on the server even in their hardest moments. Saying bandwidth is underused I not only know that clients and the server are connected to the Internet with a bigger channels than really used (which leaves the a chance they may have a bottleneck of a sort on the route between them), I've tested bandwidth between clients and the server by copying files among them.

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• Help with routing table

  - by user68752

  I have tried to find the answer to my question but not really found a clean and easy solution. I have a box (Ubuntu headless 10.04.1 server, with one Ethernet port) on LAN behind a router (running m0n0wall), that I have successfully installed a PPTP device (ppp0) on, this is working flawlessly (following this link) The thing is I want this box to route all it's internet traffic through the VPN tunnel (ppp0 device) but also being able to access the local LAN on 192.168.1.* subnet. I've succeeded a bit with this, but my problem right now is that I have port forwards (e.g. SSH) done in the m0n0wall pointing to this specific box which forces me to do "add routes" to all boxes that want to access this machine through this specific port. For instance a machine with ip xyz.xyz.xyz.xyz needs to have a static route setup in the routing table on the box to be able to access the box. This is the result of route -n xxx.xxx.137.2 192.168.1.1 255.255.255.255 UGH 0 0 0 eth0 xxx.xxx.137.2 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 yyy.yyy.0.0 192.168.1.1 255.255.0.0 UG 0 0 0 eth0 0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 ppp0 Where xxx is the IPs provided from VPN server. yyy.yyy.0.0 is a net that i want to have access to the box, without this I can't access the box from outside the LAN (via port-forwards done in router software, m0n0wall) is there away round this ugly solution?

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• How to add a user to Wheel group?

  - by Natasha Thapa

  I am trying to add a use to wheel group using in a Ubuntu server. sudo usermod -aG wheel john I get: usermod: group 'wheel' does not exist On my /etc/sudoers I have this: > cat /etc/sudoers > # sudoers file. > # > # This file MUST be edited with the 'visudo' command as root. > # > # See the sudoers man page for the details on how to write a sudoers file. > # > > # Host alias specification > > # User alias specification > > # Cmnd alias specification > > # Defaults specification > > # User privilege specification root ALL=(ALL) ALL %root ALL=(ALL) NOPASSWD: ALL > > %wheel ALL=(ALL) NOPASSWD: ALL Do I have to do groupadd of wheel?

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• How to track things that SHOULD happen, but might not have

  - by Kamiel Wanrooij

  I am running into a couple of issues with some applications we've deployed and maintain. I have the feeling we have approached this with some anti-patterns up to now, but I would like to see how to make this more flexible and stable. In one situation, we have a server at a client which pushes data to us to parse every night (yes, Windows Task Scheduler). This is highly unstable however, so once every month this doesn't happen because of reasons out of our control. This heavily impacts our business since we run with stale data in that situation. In another scenario we have a lot of background job processes that should be running. We already keep them up using bluepill ( http://www.github.com/arya/bluepill ) but obviously restarts happen, both automatically and manually, and people forget things or systems mess up. What I would like to track is events that should occur or should be available. Like the existence of a process, the execution of a program, or the creation/age of a file, and track it when they don't happen or exist. We develop most things in Ruby on Rails, use NewRelic, Bluepill and Munin, and run on Ubuntu. I've been toying around with counting ps aux | grep processname | wc -l in Munin scripts, or capturing the age of a file and raising alerts over 24-26 hours, stuff like that. Is there better tooling to track things that should happen, and raise alerts if they don't? P.S. I know some things are suboptimal, like manually having to define bluepill for applications and then forgetting to do so. The same goes for the push based approach of the first application, a dedicated daemon that manages that on the client side that we control and can track its connection to us might be a much better solution.

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• Website hosted on my virtualbox web server not displaying images or applying css when viewed through phone

  - by WebweaverD

  I would really appreciate it if someone could help me. Please let me know if you need more info in the comments. My Set Up I have a windows 7 pc. On it I run a virtual box VM with a ubuntu 12 guest os and LAMP setup. I share files between the two machines using samba from linux to windows and using windows file sharing (Workgroup) the other way round. The vm is set up with a bridged network adapter and can happily serve web pages to my host machine. I use DHCP reservations on my home wireless router/modem to reserve an ip for the vm and give it a sitename.dev in my windows host file so I can access it at sitename.dev through the browser. The Problem So far so good but I have a dev project which needs a lot of mobile template development, now obviously I can use a browser plugin to simulate a mobile device but I would like to be able to see the real thing easily on my phone during development. So ideally I would like a similar setup on my iphone to my windows setup Now I'm not great on networking and dont have much experience with web server set up. So when I typed the ip of my virtual box into my iphone i wasnt expecting to see anything. I was pleasantly surprised when my site loaded up. The javascript even seems to be running but the images and css are not happening. My Question 1) What is happening here, is it something to do with the bridged set up on the vm network? 2)How do I make the sites load properly through my phone Notes I've also tried another phone. The same sites viewed on live servers work fine.

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• Uploads fail with shorewall enabled

  - by JamesArmes

  I have an Ubuntu 8.04 server with shorewall 4.0.6 installed. When I try to upload files using FTP, SCP, or cURL the file upload stalls almost immediatly and eventually times out. If I turn off shorewall then the uploads work fine. I don't have any rules that specifically allow FTP and I'm not too concerned with it, but I do need to be able to upload via 22 (SCP) and 80 & 443 (cURL). This is what my rules look like: COMMENT Allow Server to respond to any web (80) and SSL (443) requests ACCEPT net $FW tcp 80 ACCEPT $FW net tcp 80 ACCEPT net $FW tcp 443 ACCEPT $FW net tcp 443 COMMENT Allow Server to respond to SNMPD (161) requests ACCEPT net $FW udp 161 COMMENT Allow Server to respond to MySQL (3306) requests (for MySQL Graphing) ACCEPT net $FW tcp 3306 COMMENT Allow Server to respond to any SSH connection attempts, and to SSH out. SSH/ACCEPT net $FW SSH/ACCEPT $FW net COMMENT Allow Server to make DNS Requests out. DNS/ACCEPT $FW net COMMENT Default "close" anything else. Ping/REJECT net $FW ACCEPT $FW net icmp #LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE I expected the top four ACCEPT lines to allow inbound and outbound traffic over 80 and 443 and I expected the two SSH/ACCEPT lines to allow inbound and outbound trffic over 22, including SCP. Any help is greatly appreciated. /etc/shorewall/policy contains the following (all lines above are commented out): # # Allow all connection requests from teh firewall to the internet # $FW net ACCEPT # # Policies for traffic originating from the Internet zone (net) # Drop (ignore) all connection requests from the Internet to the firewall # net all DROP info # THE FOLLOWING POLICY MUST BE LAST # Reject all other connection requests all all REJECT info #LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE

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• How can I make my Super keys (Windows Key) behave more like Ctrl/Alt/Shift in Linux

  - by deltaray

  After using the Ctrl + "arrow keys" for 13 years to switch virtual desktops in X windows, I've been convinced recently to change to using the Super keys instead (the windows key and the context menu key, which I've remapped). This all works fine for the most part. However, something is still picking up the key events that these keys are sending as if they are a normal alphanumeric like key. For example, I first noticed this in Google Docs spreadsheet that if I press the windows key alone over top of a cell, that it starts editing that cell. It doesn't insert anything, it just sends a key event that Firefox sees and starts editing the cell. This caused problems on a collaborative document I was working on as the way Google docs works, it led to me accidentally erasing the data in a few fields before I realised what was going on. I like using the super keys, but I want them to behave more like a Ctrl or Alt key does in that its a modifier key and doesn't send anything until a second key is pressed. My setup is the following: Ubuntu 10.10 XFCE 4 Microsoft Natural Ergo 4000 keyboard (with the logo scratched out) The following is my .Xmodmap file: remove Lock = Caps_Lock keycode 66 = Escape ! The below maps my other windows context menu key. keycode 135 = Super_R Edit: As requested, here is the relevant output from xev for a keypress and keyrelease of my Super_L (left windows key) KeyPress event, serial 34, synthetic NO, window 0x8200001, root 0x15d, subw 0x0, time 2428849342, (177,174), root:(182,228), state 0x10, keycode 133 (keysym 0xffeb, Super_L), same_screen YES, XLookupString gives 0 bytes: XmbLookupString gives 0 bytes: XFilterEvent returns: False KeyRelease event, serial 34, synthetic NO, window 0x8200001, root 0x15d, subw 0x0, time 2428849430, (177,174), root:(182,228), state 0x50, keycode 133 (keysym 0xffeb, Super_L), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False

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• 3 Monitor PCI-e Graphics card on Linux (without tremendous pain)?

  - by N Rahl

  As we are all painfully aware, the only way to get multiple monitors AND compositing (Compiz) on Linux is to use a single graphics card that can drive both (or in my case all three) screens. I bought a Radeon 5750 specifically because it claims to able to drive 3 monitors. I can plug in 3 monitors (2 DVI, 1 HDMI) and the Catalyst Control Center shows all 3, but only 2 can be enabled at a time. The exact message is: The current settings cannot be applied. Possible issues may include: - Display(s) cannot be enabled. - Setting(s) cannot be applied due to insufficient video memory. So I'm going to assume that either the 5750 doesn't support 3 monitors, OR, more likely, ATI couldn't be bothered to add that support to their Linux drivers. So this is a multipart question: First, can anyone suggest a PCI Express Graphics card that can run 3 screens on linux without tremendous pain? I'm looking for something where you install the driver and all three screens "just work". Does such a card exist? Second, if you have a 5750, have you been able to get it to do 3 monitors? I'm running Ubuntu 10.04 at the moment.

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• Symlink path can be followed manually, but `cd` returns Permission denied

  - by Ricket

  I am trying to access the directory /usr/software/test/agnostic. There are several symlinks involved in this path. As you can see by the below transcript, I am unable to cd directly to the path, but I can check each step of the way and cd to the symlinked directories until I reach the destination. Why is this? (and how do I fix it?) Ubuntu 12.10, bash > ls /usr/software/test/agnostic ls: cannot access /usr/software/test/agnostic: Permission denied > cd /usr/software/test > cd agnostic bash: cd: agnostic: Permission denied > pwd -P /x/eng/localtest/arch/x86_64-redhat-rhel5 > ls -al | grep agnostic lrwxrwxrwx 1 root root 15 Oct 23 2007 agnostic -> noarch/agnostic > ls -al | grep noarch ... lrwxrwxrwx 1 root root 23 Oct 23 2007 noarch -> /x/eng/localtest/noarch > cd noarch > cd agnostic bash: cd: agnostic: Permission denied > ls -al | grep agnostic lrwxrwxrwx 1 5808 dip 4 Oct 5 2010 agnostic -> main > cd main > ls (correct output of `ls`) > pwd /usr/software/test/noarch/main > pwd -P /x/eng/localtest/noarch/main

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• Route all traffic of home network through VPN

  - by user436118

  I have a typical semi advanced home network scenario: A cable modem - eth A wireless router (netgear n600) eth and wlan A home server (Running ubuntu 12.04 LTS, connected over wlan) A bunch of wireless clients (wlan) Lying around I have anoher cheaper wlan router, and two different USB wlan NIC's that are known to work with Linux. ACTA struck. I want to route ALL of my WAN traffic through a remote server through a VPN. For sake of completition, lets say there is a remote server running debian sqeeze where a VPN server is to be installed. The network is then to behave so that if the VPN is not operative, it is separated from the outside world. I am familiar with general system/network practices, but lack the specific detailed knowledge to accomplish this. Please suggest the right approach, packages and configurations you'd use to reach said solution. I've also envisioned the following network configuration, please improve it if you see fit: ==LAN== Client ip:10.1.1.x nm:255.0.0.0 gw:10.1.1.1 reached via WLAN Wlan router 1: ip: 10.1.1.1 nm:255.0.0.0 gw: 10.10.10.1 reached via ETH Homeserver: <<< VPN is initiated here, and the other endpoint is somewhere on the internet. eth0: ip:10.10.10.1 nm: 0.0.0.0 gw:192.168.0.1 reached via WLAN Homeserver: wlan0: ip: 192.168.0.2 nm: 255.255.255.0 gw: 192.168.0.1 reached via WLAN ==WAN== Wlan router 2: ip: 192.168.0.1 nm: 0.0.0.0 gw: set via dhcp uplink connector: cable modem Cable Modem: Remote DHCP. Has on-board DHCP server for ethernet device that connects to it, and only works this way. All this WLAN fussery is because my home server is located in a part of the house where a cable link isnt possible unfortunately.

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• virtual host settings fail on multiple sites

  - by Ricalsin

  Wow. I'm puzzled. On my ubuntu system I've setup an apache2 server and configured three virtual hosts in the /etc/apache2/sites-available directory. a2ensite to symbolic link the sites-enabled. The first two work great; a simple url of localhost.mysitenames.com works great for the first two sites, both finding their DocumentRoot and Directory paths. The third always generates a Bad Request (Invalid Hostname) response. No server error.log as it never hits it. I've copied/pasted the working vhost files, made the minor changes to the ServerName, DocumentRoot and Directory and the same problem persists. I always "sudo /etc/init.d/apache2 restart" whenever I make a change. I've cleared the browser cache as well. No love. There's not a limit to the number of sites you can host, right? My goal was a localhost development environment with the expectation I can run any number of websites locally before pushing them to a live server. Any thoughts on how to debug this? Or, just a simple solution I am missing?

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• Server needs to ping outgoing before allowing connection

  - by QuintenVK

  Okay, first our setup: I'm currently working over VPN to a mac mini OSX 10.6 server. We have a testsetup VM running on that, using ubuntu 12.04. Earlier today, there was an outage because of which our mac mini server was reset. Since then, i was unable to initiate a connection to the VM (which i did boot) -- no ssh, no web, ... . I couldn't ssh or web from the mac mini to the vm either. I could do so from within the VM itself, though. Ping did work on all machines. Lastly, I tried pinging from the VM to my laptop. It took a moment, but then it finally started to ping (no timeouts or so). After that, web and ssh magically worked. I then didn't use the machine for about 5 minutes, after which i had to ping from the server to my laptop again before i could setup a connection. I'm in the dark on what this could be, though I think this is something to do with lookups.

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• Is there any reason this cronjob would fail in cron, but not on the command line?

  - by Treffynnon

  I have written a little one liner that will email me when a list of files changes - I used sha512 to generate a list of hashes and then periodically check that those hashes still match. */5 * * * * /usr/bin/sha512sum --status -c /sha512.sumlist && echo "Success" > /dev/null || echo "Check robots.txt and index.html in /var/www as staging sites are now potentially exposed to the world and the damned googlebot" | /usr/bin/mail -s "Default staging server files have changed" [email protected] It works fine on the command line with: /usr/bin/sha512sum --status -c /sha512.sumlist && echo "Success" > /dev/null || echo "Check robots.txt and index.html in /var/www as staging sites are now potentially exposed to the world and the damned googlebot" | /usr/bin/mail -s "Default staging server files have changed" [email protected] As soon as I run it as a cronjob though it emails every time it runs with the failure message instead of only when the sha512sum check should fail. Is there something silly I have missed in a rush? I forgot to mention that I am running an Ubuntu machine.

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• How can I disable 'natural breaks' in Workrave?

  - by Pixelastic

  I've just discovered Workrave, and was trying to use it along the Pomodoro technique (5mn break every 25mn). But the concept of 'natural breaks' of Workrave seems to interfere with what I'm trying to achieve. Workrave tries to guess that I'm doing a natural break if I stop using my mouse and keyboard for longer than 5s. It then stops the work timer, and start counting time as if I was doing my break. Here is a typical example : I've configured a 5mn rest break every 25mn. I start working. 10mn later, I receive a phone call, or start talking with a colleague, or any work-related action that do not need either keyboard nor mouse. Workrave then stops counting my time as work time, and starts its rest timer. If my phone call is shorter than 5mn, then Workrave will resume its timer where it stopped it. Meaning that my time on the phone is not counted as work time, and so my break time is pushed a few minutes later than it should be. Even worse, if my phone call is longer than 5mn, then Workrave count it as a complete rest break, and when I'll resume working, it will restart its timer completly. I'm looking for either a way to disable the natural breaks, or increase the 'inactivity time' from 5s to maybe ~1mn. Or maybe an other angle to look at the natural breaks that might work with the Pomodoro technique (forced 5mn breaks every 25mn). I'm using Ubuntu 11.10.

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• How to change the mail domain server so it's not displaying IP? Changing [email protected] to [email protected]

  - by Pavel

  Hi guys. I'm kinda a noob as a server admin so please bear with me. I've installed postfix mail server and everything is working fine but the 'from' box is displaying [email protected]. I want to set it up so it displays domainname.com instead of IP. I just hope you know what I mean. My main.cf in postfix folder looks like this: # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = mail.thevinylfactory alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = mail.thevinylfactory.com, thevinylfactory, localhost.localdomain, localhost relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all Can anyone help me with this one? If you need any more details please let me know. Thanks in advance!

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• Linux: 3 Monitor PCI-e Graphics card (without tremendous pain)?

  - by N Rahl

  As we are all painfully aware, the only way to get multiple monitors AND compositing (Compiz) on Linux is to use a single graphics card that can drive both (or in my case all three) screens. I bought a Radeon 5750 specifically because it claims to able to drive 3 monitors. I can plug in 3 monitors (2 DVI, 1 HDMI) and the Catalyst Control Center shows all 3, but only 2 can be enabled at a time. I'll post the exact error message here soon, but it's very useless. So I'm going to assume that either the 5750 doesn't support 3 monitors, OR, more likely, ATI couldn't be bothered to add that support to their Linux drivers. So this is a multipart question: First, can anyone suggest a PCI Express Graphics card that can run 3 screens on linux without tremendous pain? I'm looking for something where you install the driver and all three screens "just work". Does such a card exist? Second, if you have a 5750, have you been able to get it to do 3 monitors? I'm running Ubuntu 10.04 at the moment. Thanks, Nick

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• crontab not running on VirtualBox unless I'm logged in

  - by Mike

  I am running Ubuntu Server 9.04 in VirtualBox on my work PC as a development environment. I have some scripts that I've put in my user's crontab that run throughout the day while I'm SSHed into the VM. Last night, I closed PuTTy and all of my other running applications (except for VirtualBox and the VM) and went home. I came back this morning to discover that my cron jobs didn't run at all, yet when I SSHed into the VM, the next scheduled job ran. I set the schedule to 5min to test, disconnected again, and the jobs stopped running on schedule. They seem to only run if I'm logged in to the machine. Obviously, I want them to run on schedule even if I'm not logged in to the VM, otherwise there's no point. Is there something I've failed to configure correctly? New Information: There are now 3 entries in /var/log/cron.log saying the following "Mount of private directory return code [256]"... the entries correspond to when the cron job is supposed to run. I thought they are supposed to run as my userid? Why would my own userid be unable to run a script in my home directory?

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• package manager cannot create users? installation script fails?

  - by RapidWebs

  It seems that when trying to install any package which requires the creation of a system User and Group, the installer fails with the error: install: invalid user 'username' When it happened the first time, I assumed it was related to the package, or it's installation script. But now I am attempting a different package, and alas, the same issue arises! note: /etc/passwd and /etc/group is not chattr -i Here is the example output from an attempted installation (of varnish): Selecting previously unselected package varnish. Unpacking varnish (from .../varnish_3.0.2-1ubuntu0.1_amd64.deb) ... Processing triggers for man-db ... Setting up libvarnishapi1 (3.0.2-1ubuntu0.1) ... Setting up varnish (3.0.2-1ubuntu0.1) ... install: invalid user `varnish' dpkg: error processing varnish (--configure): subprocess installed post-installation script returned error exit status 1 Processing triggers for libc-bin ... ldconfig deferred processing now taking place Errors were encountered while processing: varnish note: running ubuntu 12.04 For now, I have resolved the issue by manually creating the users, and running apt-get install -f, but this does not resolve the actual issue. Any ideas?

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• Virtual Server HDD shrinks without apparent reason

  - by Christian

  We have a virtual hosted Linux server, and in the last few months every now and then the HDD shrinks from 400GB down to the exact byte count that is in use. All existing data can be downloaded and displayed without a problem, but we can't upload or edit any files because of the "full" hard drive. Here is a screenshot, where "size" should be 400GB: This has happened twice before, and again today. The last times, when I reported the issue to the host, they said "that isn't possible, you must be doing it wrong", but soon after the call, the problem vanished without us doing anything, so I suppose that they have some kind of problem they're not willing to admit. Even after the fact, they acted like nothing was wrong and wrote me a mail in which they explained that I can use "df -h" to view available disk space (well duh, how do you think I noticed this particular issue?). Questions about if and what they had done were ignored. It has happened around the 25th to 28th of the month, so I suspect that they might have a cronjob running every 30 days or so which wreaks havoc with some VM configs. I just want to understand the problem, but the host support hasn't been very helpful in that regard. I have tried Googling the issue, but any combination of search terms I can come up with just gives me tutorials on how to change HDD size in a virtual machine. a) What could be the cause of shrinking HDD size in a Ubuntu 12.04.3 LTS server? Could there be anything in our virtual machine or is it more likely to be an issue with the vm host? b) Can I do anything about it without needing to contact the host's support? c) Is there anyway I can prevent this from happening at all?

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• How can I extract data from Toshiba Satellite with a dead Windows installation?

  - by msanford

  I've got a Toshiba Satellite (unknown model number but bought early 2010) running Windows Vista which throws a kernel error on boot. We don't have the restore/recovery CD any more to restore the Windows partition. I have managed to boot to a Live CD version of Ubuntu 10.10 and have mounted the internal hard drive (which takes nearly 8 minutes). I suspect that the hard drive is malfunctioning, however, because copy tasks of even 30 megs of data to an attached and mounted USB flash drive takes over an hour, and some files are mysteriously inaccessible (not a permissions issue). When browsing folders, it takes many minutes to populate the folder window even with a single tiny file. During the copy tasks, the hard disk sounds like it tries to sleep several times in rapid succession, then continues accessing, it sounds, at full throughput. I initially tried using scp (from the shell) to copy data but I encountered the same local problems. I don't know the S.M.A.R.T. status of the hard disk, either. Is there a more effective way of going about recovering the data on the internal disk, assuming that I can't use a recovery CD and am too cheap to bring it in (for now, at least)?

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• Grub Installation Failed: Fatal Error ... now what I do?

  - by eklavya

  I know there are some threads that touch this but I feel I have done something uniquely stupid. hence the post and plea for help. I am a beginner @ Linux. So I have a PC with a HDD (hard disk drive) and SSD (solid state drive) It was running Linux Mint /dev/sda1 - HDD Partition 1 - 2 TB (mounted this is /home /dev/sda2 - HDD Partition 2 - 1 TB (separate back up drive, i was backing up files to this) /dev/sdb1 - SSD Partition 1 - 100 GB (OS) /dev/sdb2 - SSD Partition 2 - 20 GB (Swap) The operating system was Linux Mint and was installed on the /dev/sdb1 i.e the solid state drive. I had partitioned off the sda into 2 TB and 1TB and presented the 2 TB as the /home to the OS. Anyway last night I decided to make a return to Ubuntu via the path of Elementary OS. Everything went fine with the install until it stated that GRUB installed failed and this was a Fatal error (no kidding I said). No I am stuck. I have definitely done something wrong and don't know what it is... My biggest pain is the files on the /dev/sda2. I want to save these before I try something drastic like wiping off the /dev/sda completely. So I have the following questions... Can I use a liveCD USB to save these files ? I can see the /dev/sda2 but was unable to access the files in the liveCD last not least ... how do I fix the main issue here. Why could the OS not install GRUB 2b... why is my SSD the /dev/sdb ... and not /dev/sda. Does that have something to do with it that my master boot record sits on the HDD /dev/sda and not /dev/sdb

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• Mysql Query - That Is Returning Blatanty Incorrect Result

  - by user866190

  I am building a VPS node that is running Ubuntu 10.10LTS, Apache2, Mysql 5.1 and php5. I could not log in to my website admin through the browser, even though I am using the correct login details. So I logged in from the command line to check the results. When I run this query I get expected results: mysql> select * from users; +----+----------+-----------------------+----------+ | id | username | email | password | +----+----------+-----------------------+----------+ | 1 | myUserName | [email protected] | myPassword | +----+----------+-----------------------+----------+ And the same goes for this query: mysql> select * from users where id = 1; +----+----------+-----------------------+----------+ | id | username | email | password | +----+----------+-----------------------+----------+ | 1 | myUserName | [email protected] | myPassword | +----+----------+-----------------------+----------+ 1 row in set (0.00 sec) But when I run this query I get this 'unexpected response': mysql> select * from users where username = 'myUserName' and password = 'myPassword'; Empty set (0.00 sec) I am not sure why this is happening. Any help would be greatly appreciated. BTW.. I will be encrypting the user details but for now I just want to get it set up. Please help, Thanks

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• If I ssh to a domain provided by dyndns, does my password go through them?

  - by D Connors

  I'm running Ubuntu on my work PC, and my work place provides me with a static IP address but not with a domain. It's sometimes useful for me to connect to that PC through ssh, but it's not common enough for me to instantly remember the IP number. So I set um a dyndns account, and associated a short and intuitive domain name to that IP. Here's my question, when I try to ssh to the domain, it asks me $ ssh [email protected] The authenticity of host 'something.there.foo (xx.xx.xx.xx)' can't be established. RSA key fingerprint is 'ALPHANUMERIC STRING' Are you sure you want to continue connecting (yes/no)? That surprised me a little bit. I have already registered the RSA fingerprint by connecting directly to the IP address. I thought the domain name was simply a convenient way of pointing me in the right direction (i. e. the ip address), but that message makes me think my data is actually going through their servers or something. Which one is it? Am I sending my password through someone else's server? Or is ssh just really really careful, thus warning me even if the final destination is a know host? The ssh server I'm using is the openssh-server package.

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• Can I use Upstart to start a script which requires the user's X session?

  - by ledneb

  I wrote a script which greps through the output of synclient to determine whether a laptop's touchpad has miraculously turned itself off (Ubuntu seems to /love/ doing this recently) and, if so, turns it back on. The script is something like this: #!/bin/bash while true ; do if [ `synclient | grep -e"TouchpadOff[\s]*1" | wc -l` -ge 1 ] ; then synclient TouchpadOff=0 fi sleep(3) done (I don't have the laptop to hand right now but you get the point! I will update later when I'm at my laptop if that's incorrect) So I tried running this as an upstart script so my touchpad can heal itself without any interaction. But it seems synclient doesn't find the current user's X session when my script is upstart'ed. I tried running it by using something like su -c myscript.sh ledneb in my script stanza, but to no avail. Should I be looking in the direction of /etc/X11/xinit/xinitrc rather than upstart? Is there a proper way to have this script run in the context of the current (or even a hard-coded) user's x session?

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• Mixing both local and nonlocal addresses on three switches

  - by klew

  I have four computers that have nonlocal addresses like 150.X.X.X. Now I also get another few computers that should be only accessible through a gateway (it will be computing cluster) and they addresses are 10.0.0.X. I also wanted to include those four older computers to this new cluster, but I want them to be accessible from internet on nonlocal addresses (so I would like to set up them on both 150.X.X.X and 10.0.0.X addresses - I've set up it as interface eth0:0 since I have only one NIC). Those new computers have their switch and old computers also have their own switch. Both of them are connected to another (third) switch. The problem is that those old computers see each other (I can ping them), and also new computers see each other, but I can't ping old computer from new computer and vice versa. However pinging on nonlocal adresses works as expected. I looked into switch configuration and didn't find anything useful. I have no idea what I missed here. Can somebody help? All computers have Ubuntu Server 10.04

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