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  • Problems connecting Centos on VMware to the network using bridged connection.

    - by Sakin
    Hi, I installed CentOs on VMware running on windows XP. When trying to configure it to connect to the internet in a bridged configuration, I get an error message when trying to bring up the network interface: [root@VMLinux ~]# /et/init.d/network start Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for eth0... failed [FAILED] VM is running on a machine that has access to the network, I tried it on two different networks that have DHCP enabled. Everything works fine when using a NAT connection through my host. How can I make the bridge work for me? Thanks.

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  • Large file copy from NFS to local disk performance drop

    - by Bernhard
    I'm trying to copy a 200GB file from an NFS mount to a local disk. The local disk is an XFS filesystem on a LVM on top of a RAID 5 system (hardware RAID controler). I'm using rsync to monitor the transfer speed. At the beginning the IO speed is about 200MB/s, stable for the first 18GB. But then the performance drops by a factor of 10-20 and never recovers to the initial rate. Sometimes it reaches about 50-100MB/s but just for a few seconds and then the process seems to hang for a bit. At the same time all file-stat operations on the target filesystem are blocking for a long time (minutes). Also interrupting the copy process blocks for several minutes, a sub-sequent delete of the partly copied file takes also several minutes. Any ideas what could be causing this?

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  • Will these instructions work when turning of journaling on an ext4 SSD?

    - by snowlord
    I have an Acer Aspire One with an SSD for storage. I recently installed Ubuntu on it and chose ext4 for my filesystem. Then I read that journaling on an SSD isn't the best idea, so I will try to disable journaling and I have found these intstructions (from http://fenidik.blogspot.com/2010/03/ext4-disable-journal.html): # Create ext4 fs on /dev/sda10 disk mkfs.ext4 /dev/sda10 # Enable writeback mode. This mode will typically provide the best ext4 performance. tune2fs -o journal_data_writeback /dev/sda10 # Delete has_journal option tune2fs -O ^has_journal /dev/sda10 # Required fsck e2fsck -f /dev/sda10 # Check fs options dumpe2fs /dev/sda10 |more For more performance add fstab opions: data=writeback,noatime,nodiratime i.e: /dev/sda10 /opt ext4 defaults,data=writeback,noatime,nodiratime 0 0 I will use them on my boot partition. Are there any particularly bad parts here, or are there any missing steps? Will my boot partition be fit for being on an SSD after this? Or should I consider switching to ext2, or even reinstall it all and choose ext2 at partitioning time (I'd rather not though, since I've configured quite some stuff already)?

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  • Default IPv6 route on debian squeeze does not come up after boot

    - by Georg Bretschneider
    I have a problem with my default IPv6 route not coming up after boot on a Debian Squeeze system. This is my config (/etc/network/interfaces): # Loopback device: auto lo iface lo inet loopback iface lo inet6 loopback # device: br0 auto br0 iface br0 inet static bridge_ports eth0 bridge_fd 0 address 88.198.62.xx broadcast 88.198.62.63 netmask 255.255.255.224 gateway 88.198.62.33 up route add -net 88.198.62.32 netmask 255.255.255.224 gw 88.198.62.33 br0 iface br0 inet6 static address 2a01:4f8:131:10x::2 netmask 64 gateway 2a01:4f8:131:100::1 up route -A inet6 add 2a01:4f8:131:100::1/59 dev br0 My inet comes up alright, but I have to exec the route command manually after boot to make IPv6 work. Otherwise I can't even reach my gateway. This is the output of ip -6 route show after boot: 2a01:4f8:131:10x::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 unreachable fe80::/64 dev lo proto kernel metric 256 error -101 mtu 16436 advmss 16376 hoplimit 4294967295 fe80::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 I already tried it with: up ip -6 route add 2a01:4f8:131:100::1 dev br0 up ip -6 route add default via 2a01:4f8:131:100::1 dev br0 in /etc/network/interfaces, but with the same results. If I execute those commands manually on my shell, everything starts working nicely. And yes, I tried with post-up instead of up, too. Only other changes I made was to activate ip forwarding for IPv6, because I want to run some LXC containers on that system.

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  • Does my Oracle DBA need root access?

    - by Dr I
    I'm currently discussing with my Oracle DBA Collegue that request a root access on our production servers. I'm not so hot to let him use the root access on our production servers. He is arguing that he need it to perform some operations like restarting the server and some other obscure arguments. The point is that I'm not agree with him because I've set him a Oracle user/group and a dba group where Oracle user belong. Everything is running smoothy and without any root permissions for now. I also think that all administrative tasks like scheduled server restart and so one need to be operated by the proper administrator (The Systems administrator on our case) to avoid any kind of issues related to a misunderstanding of the infrastructure interactions. So, I need the help of both, sysadmins and Oracle DBAs to lead me on the correct direction. If my collegue really need this rights I'll give him, but I'm just basically quite affraid of that because of security and integrity concerns. I know that my collegue is really good as a Oracle DBA and he know is work very well, but I also know that I've very few cases where a software and its admin really need root access. Once again, I'm not looking for pros/cons but rather an advice on the way that I should take to deal with this situation.

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  • Why assign write and execute permissions to a group when executing web scripts?

    - by PeanutsMonkey
    If I have a script that is to be executed by the nobody user, why is there a need to assign group write and execute permissions. For example in the article at http://www.zzee.com/solutions/unix-permissions.shtml, it notes that the permission 755 should be assigned to scripts on a web server. I understand that the user nobody is treated as others and as the owner of the script I would like full permissions. Am I missing something?

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  • Set custom mount point and mount options for USB stick

    - by kayahr
    Hello, I have an USB stick which contains private stuff like the SSH key. I want to mount this stick to my own home directory with 0700 permissions. Currently I do this with this line in /etc/fstab: LABEL=KAYSTICK /home/k/.kaystick auto rw,user,noauto,umask=077,fmask=177 0 0 This works great but there is one minor problem: In Nautilus (The Gnome file manager) the mount point ".kaystick" is displayed. I guess Nautilus simply scans the /etc/fstab file and displays everything it finds there. This mount point is pretty useless because it can't be clicked when the device is not present and it can't be clicked when the device is present (Because then it is already mounted). I know this is a really minor problem because I could simply ignore it but I'm a perfectionist and so I want to get rid of this useless mount point in Nautilus. Is there another way to customize the mount point and mount options for a specific USB device? Maybe it can be configured in udev? If yes, how?

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  • Anyone know a good web-based file upload package?

    - by Ted Wexler
    Basically, what I'm looking for is a place for either one of our end users to be able to upload a file to this package, after either receiving a code from one of our support engineers or vice-versa(our engineers upload a file and send a code/link/something to end user) I've spent a bunch of time googling this, I found this: http://turin.nss.udel.edu/programming/dropbox2/, but the code there scares me, and it also doesn't render properly using PHP 5.3(uses short tags, who knows what else.) Does anyone have any recommendations?

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  • accidentally concatenate a large file on a remote system

    - by Dan
    Every once in a while on a computer I'm ssh'd into, I will accidentally type "cat largefile.txt" and my screen will start rushing with text for the next 10 minutes. I'm always working in a screen session, so my current solution is to just log out and then log back in, and since it can go 100X faster when I'm logged out, it'll finish in the short time it takes me to type my password in again. Is there a better way? Either involving the fact I'm in a screen session? Or a way to do this within SSH? What doesn't work: detaching from the screen session (doesn't respond until file is done outputting) trying command to move to a different window in the screen session (also doesn't respond) typing ctrl+C to kill cat command (also doesn't respond, probably because the command is done and the buffers just have to catch up)

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  • How to rename a BTRFS subvolume?

    - by hochl
    I have a BTRFS filesystem with a set of subvolumes in it. So far so good. I need to change the name of a subvolume, unfortunately the btrfs program does not allow me to rename a subvolume. Searching with Google has yielded some results, one said I can just mv, the other said I can just snapshot to a new name and delete the old subvolume. Before I crash my partition and have to reload it from the backup (it's quite large), my question is: What is the currently best way to rename a subvolume? Is it ok to just mv it, or will it invalidate some internal structures? Is making a new snapshot and removing the old subvolume the way to go, or has this some drawbacks? I know everything is still experimental, but for my purposes it has been working quite well (so far, and I have incremental backups for each day).

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  • Disable ipv6 support completely on debian squeeze 6.0.5

    - by markus
    I want to disable ipv6 support completely on debian squeeze 6.0.5. In many other posts I have seen setting the parameter net.ipv6.conf.all.disable_ipv6 = 1 in /etc/sysctl.conf should disable it. I've set that parameter and rebooted, but netstat -natp shows me that the ntp deamon is still using ipv6: udp6 0 0 :::123 :::* 0 7983 3138/ntpd Is there anything else I need to configure?

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  • mount multiple folders with nfs4 on centos

    - by microchasm
    I'm trying to get nfs4 working here. Machine 1 (server) I have a folder and in it 2 other folders I'm trying to share independently. /shared/folder1 /shared/folder2 Problem is, I can't seem to figure out how to mount the folders independently on the client. (Machine 1 - server) /etc/exports: /var/shared/folder1 192.168.200.101(rw,fsid=0,sync) /var/shared/folder2 192.168.200.101(rw,fsid=0,sync) ... exportfs -ra (Machine 2 - client) /etc/fstab: 192.168.200.201:/folder1/ /home/nfsmnt/folder1 nfs4 rw 0 0 ... mount /home/nfsmnt/folder1 mount.nfs4: 192.168.200.201:/folder1/ failed, reason given by server: No such file or directory The folder is there. I'm positive. I think there is something simple I'm missing, but I'm totally missing it. It seems like there should be a way in fstab to tell nfs which folder on the server I want to mount. But I can only find references to what looks like a root mount point (e.g. 192.168.1.1:/) which I assume is handled by exports on the server. But even with the folders set up in exports, there doesn't seem to be an apparent way to pich and choose which gets mounted. Is it not possible to mount separate folders from the same server to different mount points on the client? Any help appreciated.

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  • Serial converter - cat /dev/ttyUSB0 hangs on open

    - by Alex
    I am using Ubuntu 11.04 and attached a Garmin data cable. The device gets recognized [17718.502138] USB Serial support registered for pl2303 [17718.502181] pl2303 2-1:1.0: pl2303 converter detected [17718.513416] usb 2-1: pl2303 converter now attached to ttyUSB0 [17718.513443] usbcore: registered new interface driver pl2303 [17718.513446] pl2303: Prolific PL2303 USB to serial adaptor driver ... but when I do a strace cat /dev/ttyUSB0 it hangs on the open part and does not continue any more open("/dev/ttyUSB0", O_RDONLY|O_LARGEFILEC If I do the same on Ubuntu 12.04 it stops on fread(" ... ") which is okay, as there is currently no data comming in at this port. I am not sure if it is just a different configuration of the system or an driver related problem. How can I track this down further? Unfortunately I can not update the old Ubuntu 11.04 system for different reasons at the moment.

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  • Webcam microphone input in Gnome/pulseaudio

    - by sdaau
    Just got a "Trust" webcam, which gets recognized on my Ubuntu Lucid. It has a built in microphone - which also gets recognized - however, I cannot really get it to act as the system microphone input? Here are some screenshots of what is shown by gnome-volume-control: The default window shows Trust webcam - which has two profiles: "Analog Mono Input" and "Off" - of course, I have it on "Analog Mono Input": However, on the "Input" tab - there is no matching "device for sound input" - neither a matching connector: Then I installed pavucontrol - but that doesn't show that much more; it tells first that gnome-volume-control reads from "Internal Audio Analog Stereo": Then in "Input devices" tab, there is again nothing resembling the mic input from webcam: Finally, under "Configuration" tab, the "Trust" webcam shows, but even if its profile is on "Analog Mono Input", nothing much happens:   So, does anyone know how I could get this webcam microphone to be recognized as the system input? Many thanks in advance for any answers, Cheers!

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  • SFTP through proxy

    - by aerodynamic_props
    I have a large amount of data on scratch space at computer b that I want to get. In my network I cannot directly connect to computer b (ssh exits with "No route to host"); I must first connect to computer a, and then connect to computer b. I cannot move the data from the scratch space on computer b to computer a because of a disk quota that is imposed on me at computer a. How can I move the data from computer b to my computer in this situation?

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  • OpenLDAP ACLs are not working

    - by Dr I
    First things first, I'm currently working with an OpenLDAP: slapd 2.4.36 on a Fedora release 19 (Schrödinger’s Cat). I've just install the openldap with yum and my configuration is the following one: ##### OpenLDAP Default configuration ##### # ##### OpenLDAP CORE CONFIGURATION ##### include /etc/openldap/schema/core.schema include /etc/openldap/schema/cosine.schema include /etc/openldap/schema/inetorgperson.schema include /etc/openldap/schema/nis.schema pidfile /var/lib/ldap/slapd.pid loglevel trace ##### Default Schema ##### database mdb directory /var/lib/ldap/ maxsize 1073741824 suffix "dc=domain,dc=tld" rootdn "cn=root,dc=domain,dc=tld" rootpw {SSHA}SECRETP@SSWORD ##### Default ACL ##### access to attrs=userpassword by self write by group.exact="cn=administrators,ou=builtin,ou=groups,dc=domain,dc=tld" write by anonymous auth by * none I launch my OpenLDAP service using: /usr/sbin/slapd -u ldap -h ldapi:/// ldap:/// -f /etc/openldap/slapd.conf As you can see it's a pretty simple ACL which aim to allow access to the userPassword attribute to a specific group read only, then to the owner read and write to anonymous requiring auth and refuse the access to everyone else. The problem is: Even using a valid user with correct password my ldapsearch ends with zero informations retrieved from the directory, plus I've got a strange response on the result line. # search result search: 2 result: 32 No such object # numResponses: 1 here is the ldapsearch request: ldapsearch -H ldap.domain.tld -W -b dc=domain,dc=tld -s sub -D cn=user,ou=service,ou=employees,ou=users,dc=domain,dc=tld I did not specify any filter as I want to check that ldapsearch is correctly printing only allowed attribute.

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  • openldap make sure password does not contain username

    - by Ryan Horrisberger
    Is there a way using openldap to ensure that a user's password does not contain their name or their username? I know that you can use the ppolicy overlay pwdCheckModule by writing a C function to do password checking, but is this the best approach? It doesn't seem like many folks are doing password quality checking this way--the only example I've found is a github example which only does basic checking.

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  • Mass editing videos on Ubuntu?

    - by rick
    Hi, I'm trying to add a watermark and a credits image to all of my old videos. I downloaded them off YouTube so they are all flv (H.264?). Is there some software that will allow me do simple edits in batches? I know a little bit of Python and tried looking at some of the library but they all seem like overkill (and way above my head). So is there a solution besides getting some software and going through all my videos and doing it manually? They are all mostly the same length, but it would be nice to specify a relative position for my credits. e.g. show a static image for 10 seconds when the video is at 95%

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  • Heartbeat/DRBD failover didn't work as expected. How do I make the failover more robust?

    - by Quinn Murphy
    I had a scenario where a DRBD-heartbeat set up had a failed node but did not failover. What happened was the primary node had locked up, but didn't go down directly (it was inaccessible via ssh or with the nfs mount, but it could be pinged). The desired behavior would have been to detect this and failover to the secondary node, but it appears that since the primary didn't go full down (there is a dedicated network connection from server to server), heartbeat's detection mechanism didn't pick up on that and therefore didn't failover. Has anyone seen this? Is there something that I need to configure to have more robust cluster failover? DRBD seems to otherwise work fine (had to resync when I rebooted the old primary), but without good failover, it's use is limited. heartbeat 3.0.4 drbd84 RHEL 6.1 We are not using Pacemaker nfs03 is the primary server in this setup, and nfs01 is the secondary. ha.cf # Hearbeat Logging logfacility daemon udpport 694 ucast eth0 192.168.10.47 ucast eth0 192.168.10.42 # Cluster members node nfs01.openair.com node nfs03.openair.com # Hearbeat communication timing. # Sets the triggers and pulse time for swapping over. keepalive 1 warntime 10 deadtime 30 initdead 120 #fail back automatically auto_failback on and here is the haresources file: nfs03.openair.com IPaddr::192.168.10.50/255.255.255.0/eth0 drbddisk::data Filesystem::/dev/drbd0::/data::ext4 nfs nfslock

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  • RTNETLINK answers: File exists... maybe because assigned a new mac adress

    - by steven
    I got a "RTNETLINK answers: File exists Failed to bring up eth0:1" on "ifup eth0:1". I suspect it happens because i assigned a new mac adress in my VM's network adapter. Can you tell me how to fix the issue? My configuration looks like this: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.1.80 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.1 # Alias being connected to 192.168.10.x Network auto eth0:1 allow-hotplug eth0:1 iface eth0:1 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 Why do I get "RTNETLINK answer: File exists.." suddenly? I worked with this configuration before without problems. All i did in the past is to renew the adapters mac adress. At the moment I am connected to the 192.168.10.x Network and if I do /etc/init.d/networking stop /etc/init.d/networking start then i got "RTNETLINK [...] falied to bring up eth0:1" but the strage thing is that i am able to connect to 192.168.10.83 via ssh from my host machine. But I cannot reach the internet from the debian client. I hope it is clear what my problem is, now. update if i change my /etc/network/interfaces like this then "ifup eth0" fails, too with the same error! # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 allow-hotplug eth0 iface eth0 inet static address 192.168.10.83 netmask 255.255.255.0 gateway 192.168.10.10 dns-nameservers 192.168.10.1 with verbose option enabled i got: Configuring interfache eth0=eth0 (inet) run-parts --verbose /etc/network/if-pre-up.d ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0 RTNETLINK answers: File exists Failed to bring up eth0. same if i type this manually: ip addr add 192.168.10.83/255.255.255.0 broadcast 192.168.10.255 dev eth0 label eth0

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  • Descending list ordered by file modification time

    - by user62367
    How can i generate a list of files in a directory [e.g.: "/mnt/hdd/PUB/"] ordered by the files modification time? [in descending order, the oldest modified file is at the lists end] ls -A -lRt would be great: https://pastebin.com/raw.php?i=AzuSVmrJ but if a file is changed in a directory it lists the full directory...so the pastebined link isn't good [i don't want a list ordered by "directories", i need a "per file" ordered list] os: openwrt..[no perl - not enough space for it :( + no "stat", or "file" command] Thank you!

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