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• How to configure multiple addresses on a single interface using Fedora 16

  - by cg.

  I upgraded from Fedora 14 to 16, recently. I had two static IP v4 addresses configured on my ethernet interface by creating two files in /etc/sysconfig/network-scripts: ifcfg-eth0 -> first address ifcfg-eth0:1 -> second address After the upgrade, this resulted in an error message during the boot process and in only the second address being successfully configured on the interface. So, what is the correct way to configure multiple addresses on a single interface on Fedora 16? I could not find anything on this subject in the documentation so far.

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• Display CPU usage separately (without root privileges)

  - by synaptik

  I need to display the CPU usage for each processing core on a single shared-memory 12-core (SMP) machine. I don't have access to install htop, else I would simply use that. I don't need fancy graphs or meters, though they would be nice. For example, simply displaying: X X X X X X X X X X X X where each X is the percentage utilization of 1 of the 12 processing cores on my machine. FYI: I know I can simply look at the utilization in "top" and divide that number by the number of cores on my machine, but I prefer a solution that shows each core separately.

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• Almost All Logical Volumes Disappeared - Recovery?

  - by Alex

  We had a hard disc crash of one of two hard discs in a software raid with a LVM on top. The server is running Citrix xenserver. On the hard disk which is still intact, the volume group gets detected well, but only one LV is left. (some hashes replaced by "x") # lvdisplay --- Logical volume --- LV Name /dev/VG_XenStorage-x-x-x-x-408b91acdcae/MGT VG Name VG_XenStorage-x-x-x-x-408b91acdcae LV UUID x-x-x-x-x-x-vQmZ6C LV Write Access read/write LV Status available # open 0 LV Size 4.00 MiB Current LE 1 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 root@rescue ~ # vgdisplay --- Volume group --- VG Name VG_XenStorage-x-x-x-x-408b91acdcae System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 698.62 GiB PE Size 4.00 MiB Total PE 178848 Alloc PE / Size 1 / 4.00 MiB Free PE / Size 178847 / 698.62 GiB VG UUID x-x-x-x-x-x-53w0kL I could understand if a full physical volume is lost - but why only the logical volumes? Is there any explanation for this? Is there any way to recover the logical volumes? EDIT We are here in a rescue system. The problem is that the whole server does not boot (GRUB error 22) What we are trying to do is to access the root filesystem. But everything was in the LVM. We have only this: (parted) print Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 750GB 750GB primary boot, lvm And this 750GB LVM volume is exactly what we see on top.

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• setting up a samba PDC -error with testparm

  - by Rungano

  Hi guys I have installed a samba PDC but when I test the samba configurations file I am getting errors like these, "Invalid combination of parameters for service homes. Map system can only work if create mask includes octal 010 (S_IXGRP)." My Configuration file is as follows [homes] comment = Home Directories path = /home_srv1/%u valid users = %S read only = No create mask = 0660 directory mask = 0770 browseable = No I tried to google but with no luck, Serverfault is always my best hope. Thanks for helping out.

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• Mark packets across computers?

  - by eudemo

  I use Transmission on Ubuntu and I'm having this issue, which basically says that QoS is broken because there is no way to limit which outgoing ports uses. I was thinking of doing a dirty and ugly hack and create an interface alias and define QoS based on source address, but was wondering if is there another way. Is it possible to mark the packets on the original machine in some way, using the owner and mark modules of iptables and sending this to the router who does the QoS? From what I understand, mark on iptables only applies to the local machine, so this will not work, but is there another way?

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• Samba domain controller: remove 1 Windows client

  - by K B

  my domain is controlled by a Samba domain controller running on openSUSE 11.3. It manages other openSUSE boxes and some Windows 7 boxes. Now one harddisk of a Windows 7 computer crashed and I had to reinstall. I wasn't able to get the computer name ("Win26") of the broken PC out of the domain and so I couldn't add the reinstalled "Win26" to the domain again. So how can I remove the entry of the old "Win26" computer out of the domain controller, so that I can add the new "Win26" to the domain again? Is it one configuration file I have to edit and restart Samba? Which file would this be? Thanks in advance for your help! Regards, KB

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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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• Microsoft dans le top 20 des contributeurs au noyau Linux, 75% du code fourni par des développeurs rémunérés

  Microsoft dans le top 20 des contributeurs au noyau Linux 75% du code fourni par des développeurs rémunérés La publication de la liste des contributeurs au noyau Linux vient confirmer une fois de plus que Microsoft voit en l'open source une opportunité plus qu'une menace. L'éditeur qui a déjà pris l'initiative de passer plusieurs de ses projets en open source et d'accepter pour la première fois des contributions externes pour certains, se hisse dans le top 20 des contributeurs au noyau Linux depuis la version ...

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• Triggering GDM login on a remote machine

  - by creator

  I have to briefly describe the situation. We are planning to make a computer classroom with workstations running Ubuntu 10.04. Since making accounts for each student has not been considered reasonable, we decided to make accounts for each student group. We don't want students to share their passwords between groups so the solution would be not to give them passwords at all, but let the teacher log them in instead. Obviously he shouldn't go from one machine to another typing in credentials by hand, so we need some script that will connect to a remote machine by ssh and make GDM (or probably any other login manager if GDM cannot serve this purpose) log in specified user. I couldn't find any solutions, as well as I haven't noticed anybody in similar situation asking for help, so my question will be: can the scheme described be realized and if yes, then how? Thanks in advance.

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• Is there a version of Debian-Lenny that is legal for export from the US?

  - by molecules

  I wanted to bundle my application in a Debian-Lenny Virtual Machine so others could download it and run it without having to configure anything. However, I don't want to have to worry about US legal issues. Many of the packages in a default Debian installation include encryption algorithms. Are all default versions export-safe?    If not, is there an export-safe version?       If not, is there an easy way to make one?

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• Puppet: is it ok to "force" certname when you expect to shuffle nodes around?

  - by Luke404

  We all know (good example on SF) that Puppet hostname detection could be... fun. At our company (and I guess we're not alone at this) we usually pre-configure servers at our offices and test them before bringing the gear to a remote datacenter and rack them. Of course the reverse dns will change when doing that, even if we don't change the actual hostname of the system. We're slowly drafting our puppet setup and I'd like to be sure those moves won't create problems. My idea is to explicitly configure the desired full FQDN of the system as certname in puppet.conf at server provision time (before the very first puppet run). My process would look something like this: basic o.s. installation basic network configuration, enough to reach the internet and resolve dns install puppet and set up certname start puppet and let him manage the whole configuration test, fix problems in config (via puppet), re-test, and so on... manually stop puppet set up new network configuration for the datacenter network move the machine to DC turn it on puppet should automatically start and keep on doing its job The process is supported by detecting the environment in puppet's manifests (eg. based on subnet, like they do at Wikimedia) and modify configuration as needed (eg. resolv.conf contents appropriate for each network). Each node's certname will never change for the whole system life cycle. Is there any problem with this approach? Could it be improved?

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• Which torrent apps work headless (from command line only)?

  - by jweede

  There's a question on here about what torrent apps work well remotely, but I'm hoping to find out one that works well through a command line interface, preferably with no GUI. What torrent apps would you recommend for running from the command line?

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• scsi and ata entries for same hard drive under /dev/disk/by-id

  - by John Dibling

  I am trying to set up a ZFS pool using 4 bare drives which I have attached to my Ubuntu system via a SATA hot swap backplane. These are Hitachi SATA drives. When I list the contents of /dev/disk/by-id, I see two entries for each drive: root@scorpius:/dev/disk/by-id# ls | grep Hitachi ata-Hitachi_HDS5C3030ALA630_MJ1323YNG0ZJ7C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1064C ata-Hitachi_HDS5C3030ALA630_MJ1323YNG190AC ata-Hitachi_HDS5C3030ALA630_MJ1323YNG1DGPC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG0ZJ7C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1064C scsi-SATA_Hitachi_HDS5C30_MJ1323YNG190AC scsi-SATA_Hitachi_HDS5C30_MJ1323YNG1DGPC I know these are the same drives because I wrote down the serial numbers, and all the other drives in this system are either Seagate or WD. The serial number for the first one, for example, is YNG0ZJ7C. Why are there two entries here for each drive? More to the point, when I create my ZFS pool which one should I use; the scsi- one or the ata- one?

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• In a php script making /coderoot refer to /var/webroot/coderoot?

  - by Josh

  We are migrating a server and have modified the architecture slightly so that instead of /var/coderoot we now have /var/webroot/coderoot - I realize I could do a scripted find and replace, but I would rather have full unmodified reverse compatibility, or if that's unreasonable lets just say for theories sake. I tried using a symmlink ln -s /var/coderoot /var/webroot/coderoot but attempting to include a file in the code root using /var/coderoot/file does not work. I also tried using mod_alias with ScriptAlias and Alias. Neither worked. Is there anyway to do this?

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• Creating own Amazon Machine Image - Kernel panic

  - by amra

  I have created own AMI and registered it on Amazon EC2. But while AMI startup I receive following error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1) The image is running locally without any problems. fstab contains: proc /proc proc defaults 0 0 /dev/sda1 / ext3 relatime,errors=remount-ro 0 1 thx for help

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• Url rewrite rule

  - by vvr

  How to redirect a page form show.php?id=(15charstring) to show/(15charstring) I tried like this it is doing reverse means it is redirecting /show/(15chars) to show.php?id=(15chars) RewriteEngine on RewriteRule ^/show/([a-zA-Z0-9]{15})$ http://site.com/show.php?id=$1 Second case is i have to redirect to another page if he added &m=true to the url show.php?id=(15chars)&m=true html/show.php?id=(15chars).

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• Darkstat unable to show recent statistics.

  - by Caterpillar

  Hello All.. We have a debian machine running with firewall / gateway. We have deployed darkstat on it. When we installed darkstat it was showing statistics properly. After few days it stopped showing recent statistics. The data was getting appended to existing one. Please anyone tell me what could be the problem. Thanks In Advance.

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• create symlink to another machine

  - by microchasm

  Hi, I have 2 machines. Both running CentOS. Box1 is webserver with apache, php. Box2 is mysql, and file storage. The files will only be accessible from Box1 within the webapp. I'd like to somehow create a symlink or somesuch on box1 to a folder on box2 where uploaded files can be stored and retrieved. Security in mind, what would be the best way to go about linking these 2 boxes up in a transparent (to apache) way? NB: the boxes are connected directly to each other via a crossover cable; no lan access to box2. Much thanks!

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• How to read iptables -L output?

  - by skrebbel

  I'm rather new to iptables, and I'm trying to understand its output. I tried to RTFM, but to no avail when it comes to little details like these. When iptables -vnL gives me a line such as: Chain INPUT (policy DROP 2199 packets, 304K bytes) I understand the first part: on incoming data, if the list below this line does not provide any exceptions, then the default policy is to DROP incoming packets. But what does the 2199 packets, 304K bytes part mean? Is that all the packets that were dropped? Is there any way to find out which packets that were, and where they came from? Thanks!

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• How to Extending a logical volume in WMWare

  - by Mercer

  down vote favorite i have a CentOS 6.3 into my Virtual Machine. I have 2 Disk: Disk#1 = 18G Disk#2 = 20G [root@vm ~]# df -h Filesystem Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_system-lv_root 1008M 250M 708M 27% / tmpfs 1.9G 0 1.9G 0% /dev/shm /dev/sda1 194M 31M 154M 17% /boot /dev/mapper/vg_system-lv_home 504M 17M 462M 4% /home /dev/mapper/vg_system-lv_opt 2.0G 68M 1.9G 4% /opt /dev/mapper/vg_produits-lv_grid 6.9G 2.5G 4.1G 38% /opt/grid /dev/mapper/vg_produits-lv_oracle 6.9G 144M 6.4G 3% /opt/oracle /dev/mapper/vg_system-lv_tmp 2.8G 71M 2.6G 3% /tmp /dev/mapper/vg_system-lv_usr 2.5G 1.6G 799M 67% /usr /dev/mapper/vg_system-lv_var 2.0G 278M 1.6G 15% /var So i want to extend my /tmp and my /opt/oracle like this: 10Go in/tmp 13Go in /opt/oracle Thx.

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• RSync over SSH hangs and fails with timeout

  - by tx2

  Client: Gentoo, GCC 4.3.4, RSync 3.0.9 Server: Ubuntu 10.04.4 LTS, RSync 3.0.7 Client and server connectet through is Internet, about 2Mbps. Ping is ok. RSync called on any files in any direction hangs on random file, then, after timeout, fails with: [sender] io timeout after 30 seconds -- exiting rsync error: timeout in data send/receive (code 30) at io.c(140) [sender=3.0.9] [sender] _exit_cleanup(code=30, file=io.c, line=140): about to call exit(30) In 1/10 trys is pass correctly. I've tryed to add SSH options TcpRcvBufPoll=yes, KeepAlive=yes; disable and enable rsync compression -- no changes. How can i make rsync works properly?

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• How to get the speed of a network card on the command line?

  - by nelaar

  I am trying to see what the speed of some network cards on a remote server. Our reporting software says they are 10Mbps, but I am sure that is wrong they should be 1Gbps. Our monitoring software uses SNMP to query the servers, perhaps the servers are reporting information incorrectly. ifconfig does not report what the speed of the devices are. How can I see what the currently configured speed of the cards are.

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• Will deleting partitions affect my hard drive in any way?

  - by Portali5t

  I installed a Suse partition of around 200 Gigabytes on my hard drive, primarily running Windows 7. I am sick of Suse's crap, and just want to get rid of the OS and get that partition back for Windows' use. Is it as simple as that partition gets deleted,and I can choose what partition that space goes to, or is it communal that all partitions can access? I know next to nothing about partitions, so any help would be great. Also, if someone knows HOW to delete partitions, that would be a great help too. Thanks!

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• cannot find java even though it is there (ubuntu 12.04)

  - by Jeff Storey

  I'm trying to just execute the java command and it's saying it cannot be found, even though it is there. Here's what my output looks like root@oneiric:/usr/lib/jvm/default-java/bin# ls -al java -rwxrwxrwx 1 uucp 143 5750 2012-09-20 11:14 java root@oneiric:/usr/lib/jvm/default-java/bin# ./java -su: ./java: No such file or directory So the ls shows it's there, but it doesn't seem to execute. Can someone explain why this is?

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• Single application through OpenVPN tunnel (Debian Lenny)

  - by user14124

  I'm using Debian Lenny and I want to tunnel rtorrent only through a OpenVPN tunnel. I have a tunnel running, the config file looks like this: client dev tun proto udp remote openvpn.xxx.com 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/xxx/keys/ca.crt cert /etc/openvpn/xxx/keys/client.crt key /etc/openvpn/xxx/keys/client.key tls-auth /etc/openvpn/xxx/keys/tls.key 1 ns-cert-type server comp-lzo verb 3 auth-user-pass script-security 3 reneg-sec 0 My idea is that I could run a sockd proxy internally that redirects traffic to the openvpn tunnel. I could use the *nix "proxifier" application "tsocks" to make it possible for rtorrent to connect through that proxy (as rtorrent doesn't support proxies). I have trouble configuring sockd as my IP inside the VPN changes every time I connect. This is a config file someone said would help: http://ircpimps.org/sockd.conf As my IP changes at each connect I don't know what to put in that config file. I have no control over the host side config file. Any help wanted. Any other method is very welcome.

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