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• RAID 5 heavy IO hard freezes Ubuntu: Why?

  - by Luke has no name

  I have a software RAID 5 partition on LVM in Ubuntu (desktop, actually, but I'm using it as a server). I have been rsyncing a ton of data to it, and the computer was hard freezing, as in I needed to press "Reset". So I thought it was rsync. But I decided I'd try a dd if=/dev/zero of=/path/to/raid5 and sure enough, the computer locked up. Did an identical dd to a JBOD partition on the same machine, and it didn't crash. Assuming a clean RAID5 partition, tri-core processor 2GB of ram, 6GB swap, what could be causing this?

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• OpenBSD: Gateway outside subnet (works in Linux)

  - by kshade

  We need to set up an OpenBSD host to use a default gateway that's outside of it's subnet. This is all I need to do on Linux (not the actual IPs) to achieve it: ifconfig eth0 33.33.33.33/31 up route add 33.33.33.254 dev eth0 route add default gw 33.33.33.254 The problem is that we don't know the proper equivalent of the middle command in OpenBSD. The man page says: If the destination is directly reachable via an interface requiring no intermediary system to act as a gateway, the -iface modifier should be specified; Sadly we can't seem to figure out how to make it work with that. This is a virtual host on an OVH server, they have documentation for many other operating systems showing how to do it here: http://help.ovh.co.uk/BridgeClient

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• Connect to my virtualbox mysql server

  - by WebweaverD

  I wonder if someone here could help me, this is my set up: I am on a windows 7 machine running a ubuntu virtualbox as my local web server and database server (mysql). I have just got hold of a copy of Komodo which i am running on my windows machine which I would like to hook up to my database. The fields it needs are hostname, port, socket, username and password. I know the username/password but am unsure how to find out what to put for the other fields. The ubuntu vb has an ip of 192.168.0.10, which is in my hosts file as http://swishprint.dev I hope I have asked this in the right place, any help much appreciated.

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• Hot swap in Ubuntu Server not working

  - by druciferre

  I am running Ubuntu Server 10.04 (lucid lynx), and I just purchased a hot-swap compatible hdd bay and installed it. When I insert a hot-swappable SATA drive, the drive does not show up after running ls /dev/sd?. If I reboot the server, then after it comes back up the drive appears. I have checked /var/log/messages and nothing shows up when I insert the drive, only after rebooting. I have tried the following: $ sudo echo "0 0 0" > /sys/class/scsi_host/host4/scan $ sudo partprobe` $ sudo udevadm trigger Every answer I've found searching Google was one of the things I listed in "I have tried..." and I don't really know what to do at this point. Does anyone know why this occurring?

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• Apache httpd VirtualHost config - multiple sites

  - by DaFoot

  [Advised to post here from StackExchange] I have a site to work on, because of the way the URLs are built the application seems to have been created on the assumption that it will be at the server root (only app). On my dev server I have other projects and up to now a simple symlink has been working for me, but that's not the case now because this new app wants to sit at the route and process all URLs arriving on :80. Hopefully this snippet from httpd.conf will help explain what I'm trying to acheive: # default for any not matched elsewhere <VirtualHost *:80> ServerName localhost DocumentRoot /var/www/html/newproject </VirtualHost> # now try to pick out specific URLs <VirtualHost localhost/webdev> DocumentRoot /var/www/html/existingProject ServerName localhost/project </VirtualHost> Also need to be able to get same affect from wherever I'm accessing the httpd instance from. Hope that makes sense.

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• Hylafax with serial over IP modem

  - by zero_r

  I'm looking into virtualizing a Hylafax server which currently runs on a dedicated hardware running CentOS with a Divalogic card. The main issue obviously is, how to connect the modem to the VM. There are serial over IP devices available at digi.com. Maybe there are others? Regarding digi.com devices, as far as I understood one can install the RealPort software and then have a /dev/ttySx device presented to the Linux server. This device then can be used as serial connection to the modem. Does someone have such a configuration in place? Or does someone have another idea to virtualize a Hylafax server (outbound faxes only). Thank you in advance

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• Creating bootable Fedora USB with persistent storage

  - by dooffas

  I am attempting to burn the full Fedora 19 x86_64 DVD iso to a USB drive and have a separate partition on it for a kickstart file / other media that will be installed in the kickstart process. With the Ubuntu server 12 iso, you can simply dd the iso to the usb drive: dd if=/path/to/iso of=/dev/sdb Once the iso has been burnt, open gparted and create a ext2 parition in the allocated space. However, this does not seem to work with the Fedora ISO. When loading the USB drive in gparted I get a warning and an error: Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Error: The partition's data region doesn't occupy the entire partition. Ignoring both of these errors allows gparted to load the usb drive, however it shows a blank drive with no partition table. Has anyone come across this before? From what I have found, it may have something to do with the fact that Fedora use isohybrid.

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• How can I check for a string match AND an empty file in the same if/then bash script statement?

  - by Mike B

  I'm writing a simple bash script to do the following: 1) Check two files (foo1 and foo2). 2) If foo1 is different from foo2 and foo1 NOT blank, send an email. 3) If foo1 is the same as foo2... or foo1 is blank... do nothing. The blank condition is what's confusing me. Here's what I've got to start with: diff --brief <(sort ./foo1) <(sort ./foo2) >/dev/null comp_value=$? if [ $comp_value -ne 0 ] then mail -s "Alert" [email protected] <./alertfoo fi Obviously this doesn't check for blank contents. Any thoughts on how to do that?

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• Hyper-V can't connect from host to guest via RDC

  - by Mark

  As the title describes I would like to connect via Remote Desktop Connection to my VM. I want to use it as a Dev-machine and therefore would like to work full screen, as far as I understand RDC is the way to go. I have created an internal network connection within Hyper-V, assigned it to my VM, set a static IP/Subnet on guest (Win7 Pro) and host(Win8.1 Enterprise). It worked good for the first couple of times but now it seems to be broken or I have to do odd enable/disable network connection "dances" to get it running. Ping also doesn't work always so it does seem as if the guest and host would be "disconnected".. Is there something I can do so that the network connection always will be established?

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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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• Why is my portable WD MY PASSPORT drive is not recognized?

  - by kloop

  My "MY PASSPORT" (Western Digital) portable drive is not recognized OSx. It used to be recognized, but not anymore. It does not appear in /Volumes. The hard drive is recognized by a Linux machine. I am not sure what happened -- any ideas how to fix that? Thanks. EDIT: ` #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *750.2 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 749.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *1.0 TB disk1 1: DOS_FAT_32 MY PASSPORT 1.0 TB disk1s1 `

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• How to secure a new server OS installation

  - by Pat R Ellery

  I bought (and just received) a new 1u dell poweredge 860 (got it on ebay for $35). I finished installing Ubuntu Server (Ubuntu Server 12.04.3 LTS), install apache/mariadb/memcache/php5 works great but I am scared about security. so far I am the only one using the server but eventually more people (friends, friends of friends) will use this server, use ssh etc... I want to know what can I do to secure all the information and not get hacked, both from the web or ssh or ddos and any other attack possible. Does Ubuntu Server does it for you right away? or I have to fix it my self? Thank you EDIT: I installed (so far): All dev tools ssh server LAMP I didn't install: Graphical interface

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• Two distinct mount points with one device

  - by user1761555

  After being disappointed with Ubuntu's release update feature, I finally decided to have separate mount points for / and /home. Towards this, I reformatted my HDD giving most of my drive to sda1(meant to be /home) and allocated about 40GB to rootfs (/). Unfortunately, I would also like to have a /projects which is to be located on sda1. Currently, sda1 is being mounted as /dev/sda1 on /home type ext4 (rw) I've tried looking online for a solution to this problem..however, I'm not sure as to what to look for! Is it possible to mount the 'home' directory of sda1 as /home and 'projects' directory of sda1 as /projects?

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• UID /GID with NFS and ZFS

  - by profy

  Hi, I have a server with a zfs file system (nexenta core), and I'm sharing files overs nfs with zfs share share_nfs. When I mount the file system on my client (a ubuntu workstation) I can't have the original UID/GID :( I mount my client with the following options : 192.168.1.4:/home /media/testnfs nfs rw,dev,noexec,nosuid,auto,nouser,noatime,rsize=8192,wsize=8192 0 0 If I configure idmapd I have nobody:nogroup and without idmapd I have 4294967294:4294967294, how can I get the original ID's ? Is it a problem with the nfs server or the client ? Thanks for answers.

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• How to configure OpenVPN server to use custom default gateway?

  - by Arenim

  I have a vpn server at address 10.1.0.2 and the server have another ip in it's network -- 10.0.0.2 in his subnet (it's a tun2socks router). But default server's gateway is NOT 10.0.0.2 (and it's ok) but another external IP. I want all the client's traffic to be forwarded through this ip address -- 10.0.0.2. Here is part of my server's config: dev tap0 server-bridge 10.1.0.1 255.255.255.0 10.1.0.50 10.1.0.100 push "route 10.0.0.0 255.255.255.0" ; now client can ping 10.0.0.2 push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 10.1.0.1" push "dhcp-option WINS 10.1.0.1" in fact i want some like push "redirect-gateway 10.0.0.2" How can I achieve this?

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• Why does 'dd' not work for creating bootable USB?

  - by jdowner

  Recently I wanted to create a bootable USB of Linux mint. I found that there was a lot of conflicting advice/experience about whether the 'dd' command could be used to create a bootable USB. I decided to download an ISO and try. While dd definitely put the image on the USB stick it was not bootable. So my question is what is the magic ingredient that will make this work or why has this approach persisted if it does not work? This is the command I used, dd if=/mint/iso/image of=/dev/sdb1 oflag=direct

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• Xen: How to install bootloader for domU (guest os) ?

  - by holms

  I tried to install with "grub-install" grub for guest os (which is debian) from host (centos). Tried with chroot, tried with deboostrap, tried with netinstaller. Centos is running on two raid hdd's,under LVM. Lvm volumes are created everything is formated and works. Only bootloader problem left. Netinstaller just throws me a window with error that grub can't be installed, debootstrap instructions is not clear for me in here, grub-install doesn't work in chroot, and out of chroot (grub-install /dev/mylvm/partition) Please can somebody write how to install grub for domU (guest) os from centos?

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• ubuntu 9.10 on an external usb drive: grub1 does not work

  - by Toc

  I have installed Ubuntu on a partition of my external usb drive. Since I had problems with grub2, I have uninstalled it and installed grub1. But then the usb drive didn't boot anymore, and I am forced to the limited shell of grub1. If I write manually kernel (hd0,4)/vmlinuz-2.6.31-15-generic root=/dev/sdb4 ro quiet splash initrd (hd0,4)/boot/initrd.img-2.6.31-15-generic boot then Ubuntu is loaded, but if I execute the commands root (hd0,4) setup (hd0) as explained at http://www.gnu.org/software/grub/manual/html_node/Installing-GRUB-natively.html#Installing-GRUB-natively, next time I boot from usb I am forced again to the grub limited shell. How can I restore a working grub?

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• Hard drive partition size wrong. How do I resize without loss of data?

  - by BreezyChick89

  $ fsck fsck from util-linux 2.20.1 e2fsck 1.42 (29-Nov-2011) The filesystem size (according to the superblock) is 610471680 blocks The physical size of the device is 536870911 blocks Either the superblock or the partition table is likely to be corrupt! It should be 1 partition but it now shows 2.2tb partitioned and .3tb unpartitioned How do I make the first partition correctly be 2.5tb without destroying whatever is in either partition? I did not raid or anything. My devices have been getting repeatedly corrupt by thunderstorms. Looks like people recommend doing something like in other places. sudo resize2fs /dev/sdc1 610471680

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• Large volume at /mnt on AWS instance

  - by rhaag71

  I know this is probably a somewhat 'dumb' question :) I have an AWS (small) instance and I just noticed that there is a ~150gb volume attached at /mnt, is this normal? It kinda freaked me out, I was thinking maybe someone was trying to capture whatever I mount in /mnt, there is the entry in my fstab too (and I found that others have this by googling)... the entry is as follows /dev/xvdb /mnt auto defaults,nobootwait,comment=cloudconfig 0 2 I don't have any volumes this large in my AWS volumes section though. I was just trying to understand this and be sure that someone is not trying to 'get in'... as there are many attempts daily. Thanks

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• Make Chrome always open PDFs itself

  - by jdm

  Hi, I'm looking for a way to make Google Chrome always open PDFs with its internal viewer when I click a link, as opposed to downloading it to the default location. It works with most URLs, but some servers set a special header to force the file to be downloaded ("Content-Disposition: attachment;", e.g. http://www.uni-goettingen.de/en/46260.html). What I want is the opposite of this question: Stop PDFs from displaying inside Google Chrome, or what is asked for here, but applied to Chrome: How to ignore “Content-Disposition: attachment” in Firefox Btw., I'm running Chrome 8.0.552.0 dev on Ubuntu 10.4.

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• How to calculate proper amount of inode/block sizes for a linux filesystem.

  - by Donatello

  I have an old reiser filesystem which I'm going to convert to Ext3. The problem I have is to determine the proper block- and inode-sizes for this partition. The partition is 44 GB large and has to hold 3,000,000+ files of sizes between 1 kb and 10kb, how can I figure out the best ratio of inodes and blocksize? The below is something I tried which seems OK but makes the copying files incredibly slow. mkfs.ext3 -t ext3 -c -c -b 1024 -i 4096 -I 128 -v -j -O sparse_super,filetype,has_journal /dev/sdb1 Thanks.

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• How to avoid loop limitation in a openvz container?

  - by mat.viguier

  On a openVZ containing Deb7 I need to lock the maximum size of a folder, which is used to upload on a php based web server. The directory is synced, so I have to lock the maxsize. MAXSIZE should be upgradable by adding some physical disk later ... I want to use a file as a block device for a file system. So I have done : dd if=/dev/zero of=/disk2/filesystem.dat bs=1M count=100 Then, I made the filesystem on it mkfs.ext4 filesystem.dat Then I tried to mount it : mkdir /opt/filesystem ; mount /disk2/filesystem.dat /opt/filesystem My OpenVZ (it is on a VPS) has no loop module in the kernerl. So I got Could not find any loop device as usual under OpenVz So i think I have to use FUSE, but I really do not know HOW .... Any idea on locking the size of directory under OpenVZ ?

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• How do I skip the Keep/Cancel dialog for downloads in Google Chrome?

  - by NoCatharsis

  This question is specifically for PDF files, because I work with them all day and have to download 20+ at a time. I use an extension called Linkclump which selects all links at one time. Since I disabled the Chrome PDF Viewer, these now automatically download (which I intended). The only problem is I get 20+ dialogs across the bottom of my screen that ask me if I want to Keep or Cancel my downloads. Seriously? I have to click Keep on every single one of them. This did not happen before in Chrome, the change was added a few versions ago I believe. Oh, and I'm using Chrome Dev v14.0.803.0.

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• USB flash drive showing empty but half of the capacity is in Used

  - by tamakisquare

  Not sure if I should post my question in superuser, but it looks like the most appropriate place among all StackExchange sites. I have a 16GB Kingston DataTraveler USB drive. When I tried to use it this morning, it showed up nothing in there but yet its details showed that half of the capacity was in used. I tried it with OS X, Ubuntu, and Windows 7 and the results were the same. I tried to create a new folder and it worked. Apparently, the drive is working but somehow not showing my previously stored data. Note that I was still using the drive last night and there wasn't any problems. Following @rob's suggestion, du -h gave me: 16K ./.Trashes 960K ./.Spotlight-V100/Store-V1/Stores/2620683B-A38B-42F4-A247-45CAF4826ADE 976K ./.Spotlight-V100/Store-V1/Stores 1008K ./.Spotlight-V100/Store-V1 1.0M ./.Spotlight-V100 1.1M And, df -h gave me: /dev/sdb1 15G 7.9G 7.1G 53% /media/KINGSTON Confirming what I reported. Anyone got a clue/answer to this issue? Thanks.

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