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• bursty streaming video

  - by broiyan

  What is the cause and solution for the bursty streaming media problem? Example: when streaming from youtube, audio (and video) will pause and start intermittently. When it starts it will be bursty, that is, it will play several seconds of sound in just a fraction of a second. Normal sounds are rendered unrecognizable. Then it may pause and after a few seconds, resume with another burst. The video seems to burst along with the audio. This was observed on Ubuntu 12.04 with Google Chrome.

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• Linux freezes every few seconds

  - by Zeppomedio

  We're having an issue where one our Linux boxes (Ubuntu 10.04 LTS, running on EC2 with a quadruple-large size, 68GB of RAM and 8 virtual cores with 3.25GHz each) freezes up every few seconds. Typing in an ssh session will freeze, and running strace on one of the Postgresql processes that's running usually shows: 02:37:41.567990 semop(7831581, {{3, -1, 0}}, 1 for a few seconds before it proceeds (it always gets stuck at that semop). OProfile shows that most of the time is spent in the kernel (60%) versus 37% in Postgresql. The result of these halts (which began suddenly a day ago) is that load on the box has gone from 0.7 to 10+, and causes our entire stack to slow done. Any ideas on how to track down what's going on? iostat doesn't show the disks being particularly slow or overloaded, and top shows user cpu % spike from 8% to about 40% whenever these back-ups happen.

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• Deciding to use VM or native install for new hardware

  - by Billy Moon

  I have a Ubuntu 10.10 installation running on hardware. I upgraded the hardware, and am planning to move the system over. Whilst reading the many various ways to do this, I came across tools for making a virtual machine out of a hardware installation. I think this might make managing my server easier in the future if I run it as a virtual machine. Also, I will be able to easily split responsibilities of my server, for example running MySQL on a separate virtual machine hosted on the same physical machine. Is it a good idea to install my production server as a virtual machine inside another thin server installation? What are the pros/cons and pitfalls?

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• Tool to track bandwidth by domain name?

  - by Grant Limberg

  I'm running an Ubuntu 10.04 server that hosts several domain names. All domains point to the same IP address and use the same network interface. I'm really only concerned with the main domain name such as my-domain1.com and my-domain2.com. It should include subdomains such as www.my-domain1.com with the totals for my-domain1.com. Is there a tool out there that is configurable to track bandwidth usage on a per-domain name basis? Edit: I'm not looking for only web usage. I'm looking for all traffic.

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• Syncronize Linux /etc/ directory

  - by entend

  I have virtual machine with Linux (Ubuntu server) which is used as prototype for other machines. Sometimes I make changes in prototype system and want to import this changes at some other machine. I know about Puppet, cfengine and FAI but want something easy for example rsync script which will work through ssh when it needed. Main goal is /etc/ directory. But I don't want to syncronize some private files for example /etc/passwd /etc/shadow and so on. I don't know all of it. Are there tips for my task ? May be someone have such rsync script.

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• How to keep programs from source up to date?

  - by wizard

  I'm designing a new server setup for hosting multiple websites. (Shared hosting for my clients over at SliceHost.) I've recently moved away from the traditional LAMP setup and chosen Ubuntu, Nginx, php-fpm and mysql. I like it a lot better then my old Apache, suphp, mysql setup. It works great, provided encapsulation between sites and uses substantiallly less memory. However I have one major maintenance problem. In order to have a recent version of Nginx and in order to use php-fpm I've had to compile these programs from source. The reason I see this as a problem is that keeping track of updates, and build configurations will end up being a lot of work. For two programs (and a patch) I can handle it, but it seems like this setup would not scale with many packages and servers. Are there good ways to manage this situation? I'm sure people do this all the time.

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• Best way to restrict FTP access to a single directory?

  - by John Debs

  I have a VPS running Ubuntu 10.04, and I'd like to give someone SFTP access to a single directory, but prevent them from seeing anything else on the system. What's the best way to pull this off? I considered removing "everyone" permissions from everything on the system, but that seems like a really blunt tool for this problem (and one that'll cause other issues) - I'm hoping there's a better option here. Edit: I appreciate the answers! (And I learned a bunch reading/researching through them). I ended up finding and using this guide from Linode as it spelled all the steps: http://library.linode.com/security/sftp-jails/

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• Install Mozilla Thunderbird on NAS [on hold]

  - by user2295350

  I have a small office with 3 computers running Linux Ubuntu. All the data are stored in a NAS drive (WD MyBook Live). I would like to - somehow - be able to access the email archives as well from each of these computers. For now, I don't really care if it would be possible for each user to access the email archives simultaneously (although that would be ideal). I have read about Portable Thunderbird over Wine as well as installing IMAP on the NAS drive. However, not only I haven't found a complete guide on how to do that but I am also not sure whether either of these solutions would work for me anyway.

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• Routing / binding 128 to one server

  - by Andrew

  I have a Ubuntu server with 128 ip's (static external ips 86.xx.xx.16), and I want to crawl pages thru different ip's. The gateway is xx.xxx.xxx.1, the main ip is xx.xxx.xxx.16, and the other 128 ip's are xx.xxx.xxx.129/255. I tried this configuration in /etc/network/interfaces but I doesn't work. It work if I remove the gateway for the aliases eth0:0 and eth0:1. I think this is routing problem. auto lo iface lo inet loopback auto eth0 auto eth0:0 auto eth0:1 iface eth0 inet static address xx.xxx.xxx.16 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:0 inet static address xx.xxx.xxx.129 netmask 255.255.255.128 gateway xx.xxx.xxx.1 iface eth0:1 inet static address xx.xxx.xxx.130 netmask 255.255.255.128 gateway xx.xxx.xxx.1 Also, please tell me how to "reset" every changes that I made in networking and routing. Thank you

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• How to maintain VPS server?

  - by clorz

  Assuming I have no experience in running them, what would be called a good maintenance routine for a VPS server running mail server and LAMP with a couple of sites. I've got one for quite a while now, but was doing what I feel is right without any guidance. It's ubuntu server and the only thing I do is ssh in there once a month and apt-get update, apt-get upgrade. Last year it suggested to update the distro, which I did. Waded through a bunch of diffs, broke mail server in the process and fixed it later on. So it turned out fine. Was this a right thing to do or should I stick with the old version just updating the packages? Is there a difference in the routine if it will be Fedora?

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• connecting hostname to server

  - by Michael Ropy

  I have an ubuntu server installed on my server with virtualmin webmin. everything is good the server itself....I can connect to localhost and the virtualmin manager (http://localhost:10000). the problem is, I can't connect to it from a client computer. For example when I enter the IP address of the server, its shows me 403 forbidden error (sometimes its shows the homepage right)...but the virtualmin manager could not open... if my website is example.com with this ip: xxx.xxx.xxx.xxx, i can't connect to example.com:10000 or xxx.xxx.xxx.xxx:10000 what should I do?

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• How to limit server to specific IP addresses with mod_authz_host?

  - by BeeDog

  Hi! I am very new to this area, so please bear with me. :) Right now I am running an Apache HTTP server on my setup, a very basic configuration. The website hosted on it is accessible from anywhere, and I want to limit the access to a specific IP address range. I've looked into this and I found that one Apache module called mod_authz_host handles this. http://httpd.apache.org/docs/2.2/mod/mod_authz_host.html The problem is, I haven't managed to find documentation that explains well how to actually do the stuff. How do I actually make sure only a certain range of IP addresses can access my site/server? The machine is running Ubuntu Server 10.10, the web files are stored in /var/www/, the apache2 daemon has its stuff stored in /etc/apache2/ and /usr/lib/apache2/modules/*. Thanks in advance, and sorry if this is a stupid question!

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• Sudo asks for password twice with LDAP authentication

  - by Gnudiff

  I have Ubuntu 8.04 LTS machine and Windows 2003 AD domain. I have succesfully set up that I can log in with domain username and password, using domain prefix, like "domain+username". Upon login to machine it all works first try, however, for some reason when I try to sudo my logged in user, it asks for the password twice every time when I try sudo. It accepts the password after 2nd time, but not the first time. Once or twice I might think I just keep entering wrong pass the first time, but this is what happens always, any ideas of what's wrong? pam.conf is empty pam.d/sudo only includes common-auth & common-account, and common-auth is: auth sufficient pam_unix.so nullok_secure auth sufficient pam_winbind.so auth requisite pam_deny.so auth required pam_permit.so

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• Move /var directories to to /mnt on an EC2 instance

  - by Geoff Lanotte

  I am trying to work on a standard configuration for a set of EC2 instances running ubuntu 12.04. These servers are going to be primarily web servers for a Ruby on Rails application. When you configure a new large instance, you are given a primary of 8GB and then ephemeral storage of 400 GB that is mounted to /mnt. It seems logical to me to move some directories that have a potential for growth off to the /mnt directory, I was specifically thinking of /var/www and /var/log. My question is two-fold: Is this a good idea or are there pitfalls that I cannot see? If this is a good idea, how should I go about configuring this. I do have the ability to configure new instances and down our old instances. My concern is over long term, doing this in such a way that it prevents downtime. I am a developer with some experience in devops, but mounting drives is something I have not faced before, so explicit directions would be greatly appreciated.

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• one share include more shares in diffrent premission

  - by saber

  hi all ubuntu 8.04 \ samba I want at the opening share \my_host there was the directory in which will be catalogs with different rights (eg the user with the IP is allowed to write only in one directory) example \\my_host\folder --\folder1 -user_ip1 can write to folder --\folder2 -user_ip2 .... --\folder3 my smb.conf [filials] path = /var/filials comment = No comment ;admin users = nobody ;directory mask = 755 ;read only = no available = yes browseable = yes writable = yes guest ok = yes public = yes printable = no share modes = yes ;locking = yes [filials\user1] path = /var/filials/user1 comment = No comment ;admin users = nobody ;directory mask = 755 ;read only = no available = yes browseable = yes writable = yes guest ok = yes public = yes printable = no share modes = yes ;locking = yes what is write [filials\user1] so user1 was in the catalog filials

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• Computer loads BIOS, but won't load OS

  - by LEGEND383

  I have just purchased a brand new motherboard bundle, installed into the old case with the old PSU and the old HDD. I can get into the BIOS, but whenever I try to boot from the HDD, it just sits with the fans going, but nothing is displayed. The moniter works (tested with another machine), and I'd hope there are no problems with the motherboard, CPU or RAM because as I said I only brought them today. The only things I can think of are: The PSU's motherboard connector is a 20-pin, and the motherboard has a 24-pin connector (not a problem with the previous board) The OS is not supported (doesn't seem likly to me, but possible I guess) Here is my system configuration: Motherboard: ASUS F1A55-M le CPU: AMD APU A6 3500 HDD: 1Tb SATA RAM: 4Gb DDR3 OS: Ubuntu Satanic v666.9 PSU: Winpower ATX-400 (this thing is REALLY old) If anyone is able to offer a reason as to why this is not working, or a possible solution, it would be greatly appriciated.

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• curl makes a site work externally once run locally (apache)

  - by Kyle_at_NU

  Currently when I visit mysite.mydomain.com external to the local network I get in the browser: This is the default web page for this server. Nothing to see here. This is not even the "It Work's" Apache page. Then if locally (Apache2 on Ubuntu Server 12.04 with curl installed ) type: curl mysite.mydomain.com I get the site I expect. Then the next time i visit the page externally I get the correct site. Has anyone seen this before? Tips/Suggestions?

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• User and Key Press Issues with Putty

  - by DizzyDoo

  Ubuntu Server newbie here, got some annoying issues with remote accessing my box with Putty. When I create a user and then login as that user, the terminal always starts with just '#' and not 'user@hostname:~#' which isn't useful where I want to see where I've changed directory too, like I can normally. Also, when logged in as a user, I can't press the cursor keys to move the caret (blinking thing) around, or press up to see previously executed commands. Instead it gives me this representation of the button pressed: ^[[D ^[[A ^[[B ^[[C. Pressing Delete, too, gives me ^[[3~. This is all strange to me, because when logged in as root, it all works fine. I'm hoping this is just something I've accidentally changed in Putty, or added the user wrongly, or perhaps just got caps lock on. Thanks.

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• df -h overreports disk space on VPS

  - by Rincewind42

  When I run the command df -h on my new Ubuntu linux vServer I get the following: # df -h Filesystem Size Used Avail Use% Mounted on /dev/hdv1 466G 33G 434G 7% / none 16M 0 16M 0% /tmp Running du -sh gives # du -sh du: cannot access `./proc/13624/task/13624/fd/4': No such file or directory du: cannot access `./proc/13624/task/13624/fdinfo/4': No such file or directory du: cannot access `./proc/13624/fd/4': No such file or directory du: cannot access `./proc/13624/fdinfo/4': No such file or directory 952M . The VPS should only have 5Gb of disk space but df reports 466Gb. How can I view the correct amount of disk space?

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• Problem starting X in unbuntu 10.10

  - by xain

  Hi, I recently installed ubuntu 10.10 on my old toshiba a100 (where I've been running XP with no problems for ages). The installation went fine, I can log in with my user account, but after that the screen has only the wallpaper (and the mouse is enabled). Any hints on how to troubleshoot it ? These are the Xorg and the messages log files. Thanks When booted in safe graphics mode it worked just fine. Is there a way to set that configuration as the default so I don't have to go through those menus every time I boot ?

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• Restore wubi install after changing master drive

  - by Johnny

  Recently I got a 160G drive to install other Unix distributions and learn to use them for the sake of my current job. However I've got only 2 drive connectors free (on the primary channel). Therefore I've decided to remove an 80G hard drive which has the MBR and the main Windows bootloader. My problem in particular is that I've got another 250G drive which has a Wubi installation of Ubuntu 10.04 (Lucid Lynx), which I want to preserve on the bootloader that's going to be running for all the other OSes (potentially Grub). How would I do that? Since Wubi is actually sort of windows reliant, as far as I've learned so far.

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• What's the proper way to change a process' scheduling policy to IDLE?

  - by ??O?????

  Hello. I have a long running process on a server running Ubuntu Server 9.10. I would like to make it run under the SCHED_IDLE policy using the chrt command. However, after reading the man page, I can't manage to understand the proper way to issue the command for a running process. I've tried unsuccessfully: # chrt -i -p 688 pid 688's current scheduling policy: SCHED_OTHER pid 688's current scheduling priority: 0 # chrt -p -i 688 pid 688's current scheduling policy: SCHED_OTHER pid 688's current scheduling priority: 0 # chrt -p 688 -i chrt: failed to set pid 0's policy: Invalid argument I'll keep trying, but do you know how to do what I want?

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• Two NICs, one server.

  - by kobrien

  I have two NICs on a fresh install of Ubuntu 10.04 LTS. Both are config'd be dhcp. Both cards are on the same lan with same gateway. everything about the cards is the same except the IPs they get, which is what I want. What I'm trying to achieve is having both NICs operational at the same time. Currently when the server boots, it activates both NICs, but the server can't resolve any domains. If I ifdown one of them and bring it back up, the server is able to resolve domains, but the NIC I bring up won't respond to any traffic. Any ideas?

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• error: no such partition. Grub rescue

  - by user1440731

  I deleted Linux (Ubuntu) partition from windows Ii forgot to repair mbr. The thing is I don't have my windows boot CD with me now and not CD drive. so the solution I needed is that is there any small utility software that can be easily downloaded (I knew about hiren CD but that's about 500 MB and I don't need that whole stuff) and can work through USB? Also explain steps to perform. Thank you UPDATED: Any small Linux live CD can also b taken into consideration as i can boot that on USB using pendrivelinux software

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