Discuss August 2011

discuss@lists.centos.org

222 participants
209 discussions

Problem getting eth0 up
by Alfred von Campe 19 Aug '11

19 Aug '11

I'm just starting to test CentOS 6 in our environment, and as a first step did a basic install from DVD (Desktop target, all defaults). Next I will try to automate the installations as I did for CentOS 5 using the anakonda-ks.cfg file generated by the manual install. However, I can't wrap my brain around the new NetworkManager to get it to configure the eth0 interface to obtain an IP address from our DHCP server. I've seen the FAQ on the wiki and the interface is up, but it doesn't get an IP address. I've done the installation from DVD multiple times now, each time with the same result. What am i missing? Alfred

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cr repository when running your own mirror
by Christian Anthon 18 Aug '11

18 Aug '11

Hi, what is the right way to deal with the new cr repository for centos 5 when you are running your own mirror. In particular the following statement I don't fully understand: - Once 5.7 is released, the 5.6/cr/ repositories will be removed ( they will not be available on vault.centos.org ) Christian.

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CentOS 6 and IPv6 neighbor proxy
by Helmut Drodofsky 18 Aug '11

18 Aug '11

To route a subnet in ipv6 there are two possibilities: - add route commands for the subnet in each computer - or use neighbor proxy in the router server I prefer neighbor proxy. So I have to activate neighbor proxy in the router: sysctl -w net.ipv6.conf.all.proxy_ndp=1 and I have to add entries for each client in the subnet like ip -6 neigh add proxy 2001:0:0:1:211:d8ff:fe97:3273 dev eth0 This works well but is lost on reboot. For the sysctl command there is /etc/sysctl.conf for permanent configuration. If I create a file route-eth0 in the directory /etc/sysconfig/network-scripts/ with the above ip neighbor command, the interface eth0 is immediately down. Restart of network brings: Bringing up interface eth0: Error: Unknown connection: 5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03. [FAILED] All Interfaces are NetworkManager controlled. Ask for help: - where can I store the command for a permanent configuration? - Shall I not further use NetworkManager? Thank you for help in advance Helmut

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using posfix on the local LAN, with internet FQDN
by Rudi Ahlers 18 Aug '11

18 Aug '11

Hi all, I hope someone can help me with this please. One of our clients has an in-house Postfix mailserver which basically downloads mail for the individual users from our mail server hosted on the web using fetchmail. They use our SMTP server to send mail. Their email clients are then setup to get & send mail from the server, on 192.168.2.254 (for POP3 & SMTP). All mail between them on the local LAN gets send to each other via the server, and not the internet. This works quite well, but as soon as someone sends mail from the Linux server directly (it has webmin + usermin installed and has a basic webmail interface for when they're out of the office) it sends mail using the local machine name, instead of the domain name. for example, mail comes from esther(a)ser001.rewards.local. How do I tell Postfix to automaticlly send mail from <user>@<theirdomain.com> instead? Sorry for asking this, but I don't know Postfix very well and don't know what to call to, to search on google. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Re: [CentOS] using posfix on the local LAN, with internet FQDN
by Leen de Braal 18 Aug '11

18 Aug '11

> On Thu, Aug 18, 2011 at 3:00 PM, Leen de Braal <ldb(a)braha.nl> wrote: >> myhostname = mail.braha.nl >> myorigin = $mydomain >> >> Think the second one is what you need. >> >>> >> L. de Braal >> BraHa Systems >> NL - Terneuzen >> T +31 115 649333 >> F +31 115 649444 >> >> _______________________________________________ > > > I actually had "theirdomain.com" in both otions, but changed the > second option to "$mydomain" and that didn't make any difference > either. > I presume you did reload or restart postfix > > > -- > Kind Regards > Rudi Ahlers > SoftDux > > Website: http://www.SoftDux.com > Technical Blog: http://Blog.SoftDux.com > Office: 087 805 9573 > Cell: 082 554 7532 > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- L. de Braal BraHa Systems NL - Terneuzen T +31 115 649333 F +31 115 649444

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Kickstart installation error
by Anshul Chauhan 18 Aug '11

18 Aug '11

Hi, I’m trying kickstart on CentOS Below is my ks.cfg *[root@localhost ~]# cat /root/ks.cfg* * * #Generated by Kickstart Configurator #platform=x86, AMD64, or Intel EM64T #System language lang en_US #Language modules to install langsupport en_US #System keyboard keyboard us #System mouse mouse #Sytem timezone timezone Asia/Dili #Root password rootpw --iscrypted $1$597tHcci$7GOVXzr92.Ce5IaqnXZA30 #Reboot after installation reboot #Use text mode install text #Install OS instead of upgrade install #Use Web installation url --url ftp://192.168.0.1/pub/ #System bootloader configuration bootloader --location=mbr #Clear the Master Boot Record zerombr yes #Partition clearing information clearpart --all --initlabel #Disk partitioning information part /boot --fstype ext3 --size 100 part swap --size 1987 part / --fstype ext3 --size 1 --grow #System authorization infomation auth --useshadow --enablemd5 #Network information network --bootproto=dhcp --device=eth0 #Firewall configuration firewall --disabled #SELinux configuration selinux --disabled #Do not configure XWindows skipx #Package install information %packages --resolvedeps @ gnome-desktop @ kde-desktop @ editors @ engineering-and-scientific @ graphical-internet @ text-internet *[root@localhost ~]# cat /etc/dhcpd.conf* ddns-update-style interim; ignore client-updates; subnet 192.168.0.0 netmask 255.255.255.0 { # --- default gateway option routers 192.168.0.1; option subnet-mask 255.255.255.0; # option nis-domain "domain.org"; # option domain-name "domain.org"; # option domain-name-servers 192.168.1.1; # # option time-offset -18000; # Eastern Standard Time # option ntp-servers 192.168.1.1; # option netbios-name-servers 192.168.1.1; # --- Selects point-to-point node (default is hybrid). Don't change this unless # -- you understand Netbios very well # option netbios-node-type 2; range dynamic-bootp 192.168.0.128 192.168.0.254; default-lease-time 21600; max-lease-time 43200; #filename "/var/ftp/pub/"; #next-server 192.168.0.1; allow booting; allow bootp; class "pxeclients" { match if substring(option vendor-class-identifier, 0, 9) = "PXEClient"; next-server 192.168.0.1; filename "linux-install/pxelinux.0"; } *FTP server showing ks file accessable by ananomous users via browser* * * * * Can’t find what I’m doing wrong Kickstart installation stops with error *Kickstart error * * * *Error opening kickstart file (null) bad address * *Tried same with NFS also but their also getting the same error.* Please suggest.... Warm Regards, Anshul Chauhan "Never expect things to happen struggle & make them happen Never expect yourself to be given a good value Create a value for your own.."

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Re: [CentOS] using posfix on the local LAN, with internet FQDN
by Leen de Braal 18 Aug '11

18 Aug '11

> Hi all, > > I hope someone can help me with this please. > > > One of our clients has an in-house Postfix mailserver which basically > downloads mail for the individual users from our mail server hosted on > the web using fetchmail. > They use our SMTP server to send mail. Their email clients are then > setup to get & send mail from the server, on 192.168.2.254 (for POP3 & > SMTP). All mail between them on the local LAN gets send to each other > via the server, and not the internet. > > This works quite well, but as soon as someone sends mail from the > Linux server directly (it has webmin + usermin installed and has a > basic webmail interface for when they're out of the office) it sends > mail using the local machine name, instead of the domain name. > for example, mail comes from esther(a)ser001.rewards.local. > > How do I tell Postfix to automaticlly send mail from > <user>@<theirdomain.com> instead? > I have this in main.cf: myhostname = mail.braha.nl myorigin = $mydomain Think the second one is what you need. > > Sorry for asking this, but I don't know Postfix very well and don't > know what to call to, to search on google. > > -- > Kind Regards > Rudi Ahlers > SoftDux > > Website: http://www.SoftDux.com > Technical Blog: http://Blog.SoftDux.com > Office: 087 805 9573 > Cell: 082 554 7532 > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- L. de Braal BraHa Systems NL - Terneuzen T +31 115 649333 F +31 115 649444

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Centos Gotcha: YUM Groupinstall
by david 18 Aug '11

18 Aug '11

Folks I have encountered a situation with YUM that isn't what I expected. Let's suppose I want to install a group, call it G. My first question would be -- is the group already installed. Realize all of this is scripted. So, I use yum groupinfo and I see the list of installed groups, and those not yet installed. If group G is in the list of installed groups, one would think that there's no point in issuing a "groupinstall". But, to my surprise, a group can be listed as "installed", only to find that a groupinstall will actually do a lot of installs. So, I had to adapt my script to perform a "groupinfo G", parse the modules, and individually test them to see if they need installation. I do not understand this behavior -- group G is shown as "installed", but it really isn't. David Kurn

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SAS storage arrays, C6, and SES lights
by John R Pierce 18 Aug '11

18 Aug '11

So I'm curious how SAS JBOD arrays and linux MDraid as implemented in CentOS6, and SES (SCSI/SAS Enclosure Services) backplane controllers 'get along' and how much configuration is needed to get the warning lights to work properly. scenario: whitebox server with a SAS backplane or two, daisy chained on a SAS HBA (like an LSI Logic 2008), and disks organized as several raid5/6 using linux mdraid. Does this system have to be configured to ensure that the activity and failure lights match the drive bays, or does the SAS/SES spec all sort that out 'plug and play' ? does mdraid properly set those warning lights automatically on a failed raid element? -- john r pierce N 37, W 122 santa cruz ca mid-left coast

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RAID5 suddenly broken
by Mathieu Baudier 18 Aug '11

18 Aug '11

Hello, I have a RAID5 array on my CentOS 5.6 x86_64 workstation which "suddenly" failed to work (actually after the system could not resume from a suspend). I had recently issues after moving the workstation to another office, where one of the disks got accidently unplugged. But the RAID was working and it had reconstructed (as far as I can tell) the data. After I replugged the disk, it was working normally over the last two days (enough to get back to a proper state I guess/hoped) This RAID is used as an LVM volume group for all my important data, among them the root of the operating system(s). It based on four partitions on four separate disks (the third partition of each disk, 3 active, one spare) When booting, I get an error message similar to: raid5 failed: No md superblock detected on /dev/md0. and the LVM volume group does not come up. I then booted using the CentOS 5.6 LiveCD and tried to run a few mdadm command (see just below). It seems that there are some data still lying around, but I'm not very experienced with RAID and I thought that I would ask for advice before trying commands which may impact the data such as assemble, etc. Thanks in advance for any help! Mathieu [root@livecd ~]# mdadm --misc -E /dev/md0 mdadm: No md superblock detected on /dev/md0. [root@livecd ~]# mdadm --misc -Q /dev/md0 /dev/md0: is an md device which is not active /dev/md0: No md super block found, not an md component. [root@livecd ~]# mdadm --misc -D /dev/md0 mdadm: md device /dev/md0 does not appear to be active. [root@livecd ~]# mdadm -E /dev/sd*3 /dev/sda3: Magic : a92b4efc Version : 0.90.00 UUID : 7533411a:f066a145:1e89d48e:1a8374a3 Creation Time : Tue Dec 1 12:01:05 2009 Raid Level : raid5 Used Dev Size : 204796416 (195.31 GiB 209.71 GB) Array Size : 409592832 (390.62 GiB 419.42 GB) Raid Devices : 3 Total Devices : 2 Preferred Minor : 0 Update Time : Wed Aug 17 14:47:36 2011 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 1 Spare Devices : 0 Checksum : ed6d5dcd - correct Events : 38857 Layout : left-symmetric Chunk Size : 256K Number Major Minor RaidDevice State this 0 8 3 0 active sync /dev/sda3 0 0 8 3 0 active sync /dev/sda3 1 1 0 0 1 faulty removed 2 2 8 51 2 active sync /dev/sdd3 /dev/sdb3: Magic : a92b4efc Version : 0.90.00 UUID : 7533411a:f066a145:1e89d48e:1a8374a3 Creation Time : Tue Dec 1 12:01:05 2009 Raid Level : raid5 Used Dev Size : 204796416 (195.31 GiB 209.71 GB) Array Size : 409592832 (390.62 GiB 419.42 GB) Raid Devices : 3 Total Devices : 4 Preferred Minor : 0 Update Time : Wed Aug 10 11:52:15 2011 State : clean Active Devices : 3 Working Devices : 4 Failed Devices : 0 Spare Devices : 1 Checksum : ed63a948 - correct Events : 9022 Layout : left-symmetric Chunk Size : 256K Number Major Minor RaidDevice State this 1 8 19 1 active sync /dev/sdb3 0 0 8 3 0 active sync /dev/sda3 1 1 8 19 1 active sync /dev/sdb3 2 2 8 51 2 active sync /dev/sdd3 3 3 8 35 3 spare /dev/sdc3 /dev/sdc3: Magic : a92b4efc Version : 0.90.00 UUID : 7533411a:f066a145:1e89d48e:1a8374a3 Creation Time : Tue Dec 1 12:01:05 2009 Raid Level : raid5 Used Dev Size : 204796416 (195.31 GiB 209.71 GB) Array Size : 409592832 (390.62 GiB 419.42 GB) Raid Devices : 3 Total Devices : 3 Preferred Minor : 0 Update Time : Tue Aug 16 17:48:59 2011 State : clean Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Checksum : ed6bf2b0 - correct Events : 10670 Layout : left-symmetric Chunk Size : 256K Number Major Minor RaidDevice State this 1 8 35 1 active sync /dev/sdc3 0 0 8 3 0 active sync /dev/sda3 1 1 8 35 1 active sync /dev/sdc3 2 2 8 51 2 active sync /dev/sdd3 /dev/sdd3: Magic : a92b4efc Version : 0.90.00 UUID : 7533411a:f066a145:1e89d48e:1a8374a3 Creation Time : Tue Dec 1 12:01:05 2009 Raid Level : raid5 Used Dev Size : 204796416 (195.31 GiB 209.71 GB) Array Size : 409592832 (390.62 GiB 419.42 GB) Raid Devices : 3 Total Devices : 2 Preferred Minor : 0 Update Time : Wed Aug 17 14:47:36 2011 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 1 Spare Devices : 0 Checksum : ed6d5e01 - correct Events : 38857 Layout : left-symmetric Chunk Size : 256K Number Major Minor RaidDevice State this 2 8 51 2 active sync /dev/sdd3 0 0 8 3 0 active sync /dev/sda3 1 1 0 0 1 faulty removed 2 2 8 51 2 active sync /dev/sdd3 [root@livecd ~]#

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Discuss August 2011