Discuss June 2010

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249 participants
188 discussions

posixGroup LDIF problem
by sync 29 Jun '10

29 Jun '10

Hi,all: I'm working on populating an OpenLDAP server (Dapper) for pam authentication. I'm having trouble import LDIFs for my groups. The following is and example: (this imports on CentOS 5.3 i386, openldap version is 2.3.43-3.el5 ) # org.X.admins dn: cn=admins,dc=X,dc=org changetype: add objectClass: groupOfNames objectClass: top objectClass: posixGroup cn: admins gidNumber: 1001 member: cn=admin,dc=X,dc=org I get the following error: adding new entry "cn=admins,dc=X,dc=org" ldap_add: Object class violation (65) additional info: invalid structural object class chain (groupOfNames/posixGroup) Now, if I strip it down a little, this will import: dn: cn=admins,dc=X,dc=org changetype: add objectClass: posixGroup cn: admins gidNumber: 1001 I don't see though how this is supposed to tie to a user without the member entries. So what is the wrong with it ?Could someone give me some suggestions? Thanks ~

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Problem in migrating DRBD from CentOS4.4 to CentOS5.5
by Balaji 29 Jun '10

29 Jun '10

Dear All, Previously we have used CentOS4.4 release with Supported Cluster Suite and DRBD 8.0.0 Active/passive (failover) We have build the DRBD 8.0.0 Source in CentOS4.4 Setup We have configured the DRBD Resource with default OS installed LVM (/dev/mapper/vgroot-LogVol00 and /dev/mapper/vgroot-LogVol01) Partition and its working fine Partition Tables are listed below ================================= Filesystem Size Used Avail Use% Mounted on /dev/mapper/vgroot-LogVol02 3.0G 1.1G 1.7G 39% / /dev/mapper/vgroot-LogVol03 11G 8.5G 1.7G 84% /usr /dev/hda1 494M 37M 432M 8% /boot tmpfs 248M 0 248M 0% /dev/shm /dev/mapper/vgroot-LogVol01 8.5G 148M 7.9G 2% /home /dev/mapper/vgroot-LogVol00 13G 161M 12G 2% /backup Currently we are migrating to CentOS5.5 Step 1: We have migrated to CentOS5.5 Alone and Used Older DRBD 8.0.0 Version We have build the DRBD 8.0.0 Source in CentOS5.5 Setup We have configured the DRBD Resource with default OS installed LVM (/dev/mapper/vgroot-LogVol00 and /dev/mapper/vgroot-LogVol01) Partition The DRBD Meta data created successfully, but DRBD Module Load failed Errors are listed below ======================= [root@corviewprimary user]# service drbd start Starting DRBD resources: Can not load the drbd module. [root@corviewprimary user]# [root@corviewprimary user]# modprobe drbd FATAL: Error inserting drbd (/lib/modules/2.6.18-194.3.1.el5xen/kernel/drivers/block/drbd.ko): Invalid argument [root@corviewprimary user]# Step 2: We have updated DRBD from 8.0.0 to 8.3.8 We have build the DRDB 8.3.8 Source in CentOS5.5 Setup We have configured the DRBD Resource with default OS installed LVM (/dev/mapper/vgroot-LogVol00 and /dev/mapper/vgroot-LogVol01) Partition and its not working We got the following errors on meta data creation ================================================= [root@corviewprimary ~]# drbdadm create-md drbd0 md_offset 13958639616 al_offset 13958606848 bm_offset 13958180864 Found ext3 filesystem 13631488 kB data area apparently used 13631036 kB left usable by current configuration Device size would be truncated, which would corrupt data and result in 'access beyond end of device' errors. You need to either * use external meta data (recommended) * shrink that filesystem first * zero out the device (destroy the filesystem) Operation refused. Command 'drbdmeta 0 v08 /dev/mapper/vgroot-LogVol00 internal create-md' terminated with exit code 40 drbdadm create-md drbd0: exited with code 40 [root@corviewprimary ~]# drbdadm create-md drbd1 md_offset 9395236864 al_offset 9395204096 bm_offset 9394917376 Found ext3 filesystem 9175040 kB data area apparently used 9174724 kB left usable by current configuration Device size would be truncated, which would corrupt data and result in 'access beyond end of device' errors. You need to either * use external meta data (recommended) * shrink that filesystem first * zero out the device (destroy the filesystem) Operation refused. Command 'drbdmeta 1 v08 /dev/mapper/vgroot-LogVol01 internal create-md' terminated with exit code 40 drbdadm create-md drbd1: exited with code 40 Please help us to use DRBD etiter 8.0.0 or 8.3.8 with CentOS5.5 Thanks in Advance. -S.Balaji

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CentOS 5.3 Xen installation trouble installing FUSE
by Eric B. 29 Jun '10

29 Jun '10

Hi, I've got CentOS 5.3 installed as a Xen client installed. I've recently been trying to install TrueCrypt on the VM, but am having miserable troubles with the Fuse kernel module. To date, I've installed the following packages: yum install truecrypt yum install fuse However, to launch the fuse module, I need the dkms_autoinstaller running. However, when I try to start the dkms_autoinstaller service I get the following error messages: Jun 28 23:31:57 charliebrown dkms_autoinstaller: fuse (2.7.4-1.nodist.rf): Installing module on kernel 2.6.18-128.2.1.el5xen. Jun 28 23:31:57 charliebrown dkms_autoinstaller: Kernel headers for 2.6.18-128.2.1.el5xen are not installed. Cannot install this module. Jun 28 23:31:57 charliebrown dkms_autoinstaller: Try installing linux-headers-2.6.18-128.2.1.el5xen or equivalent. Indeed, the kernel modules available in yum are for 2.6.18-194.3.1.el5. I fished around, and found a kernel-headers package for 2.6.18-128.2.1.el5 (http://137.138.246.63/cern/slc5X/x86_64/yum/updates/repoview/kernel-headers…). I downloaded the RPM, and downgraded my kernel-headers package. So I now have the kernel-headers package for 2.6.18-128.2.1.el5 installed. However, when I try to start the dkms_autoinstaller, I still get the same error message indicating that the Kernel headers for 2.6.18-128.2.1.el5xen are not installed. Where can I find this package? They aren't on the Citrix repos. From the few threads I've read, ppl are suggested to download a DDK VM to build new modules, etc, but that still won't help me, as I need the headers on the actual machine to run the dkms_autoinstaller service. I'm currently stuck / lost. Any help / suggestions would be greatly appreciated! Thanks, Eric

2 1

Upgrading MySQL
by Susan Day 28 Jun '10

28 Jun '10

Hi; I'm trying to install django and got this error: django.core.exceptions.ImproperlyConfigured: MySQLdb-1.2.1p2 or newer is required; you have 1.2.1 So then I tried yum upgrade mysql and got this: No Packages marked for Update Please advise. TIA, Susan

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Can't install Centos with DVD on KVM.
by cliff here 28 Jun '10

28 Jun '10

Subject line explains most of it.... I'm trying to install Centos from a dvd iso, that has been verified on KVM (Fedora 13) box. Virtual machine boots, and will launch anaconda and will test the media, but on the next step after that it says it can't find CD media.

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PHP version
by Steve Lindemann 28 Jun '10

28 Jun '10

Does anyone know when PHP will upgrade to version 5.2.0 or better on 64-bit CentOS 5.5? ...or know where I should look to find out for myself? ...or directions for upgrading PHP from 5.1 to 5.2 on 64-bit (I found directions for 32-bit)? Thanks. -- Steve

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Upgrading MySQLdb
by Susan Day 28 Jun '10

28 Jun '10

Hi; I've got MySQLdb installed (bridge to Python) and I can't figure out how to upgrade it. I did a find and got these paths: /usr/lib/python2.6/site-packages/SQLAlchemy-0.6beta2-py2.6.egg/sqlalchemy/dialects/mysql/mysqldb.py /usr/lib/python2.6/site-packages/SQLAlchemy-0.6beta2-py2.6.egg/sqlalchemy/dialects/mysql/mysqldb.pyc I don't have mysql-devel installed, so it wasn't that. Please advise. TIA, Susan

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Dual nw card problem again
by Jussi Hirvi 28 Jun '10

28 Jun '10

I have had problems like this before. Probably there is something important that I don't know about routing. Let me introduce to you "Lasso2", a CentOS 4 www server that has been working perfectly well for years. Now I added a second nw card (eth1), automatically using kudzu. I cannot get this dual nw setup to work. The first nw card (eth0) stopped at once working properly, when I added the second card. Hw failure is probably outruled - the connection via eth0 works normally again if I remove the eth1 card and its settings (on reboot with kudzu). There are several symptoms with the dual nw card setup, and I cannot really get to diagnosis. 1) if you ping lasso2 (the problem machine) with the eth0 ip, the ping requests come in ok, but the ping responses leave the machine via eth2 - not good. I don't really know how to analyze routing and how to use ip (the program) to fix it, so please tell me about it. The "ip route show" output looks perfectly normal to me, it is similar to another 2-card machine I have running (though that is Centos v5) [root@lasso2 ~]# ip route show 62.236.221.64/28 dev eth1 proto kernel scope link src 62.236.221.75 62.220.237.96/27 dev eth0 proto kernel scope link src 62.220.237.114 169.254.0.0/16 dev eth1 scope link default via 62.236.221.65 dev eth1 2) if I ping _from_ lasso2 via eth0, it works ok, as long as the ping target is inside the same network segment. I can ping the router. If I try to ping anything beyond that, I get nothing back. This seems to be problem with ARP resolution. It seems that the broadcast address cannot return the ARP data. This is all I can get when I ping 84.20.154.60 via eth0 (representative sample, I hope): [root@lasso2 ~]# tcpdump -i eth0 -n ! port ssh listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 00:01:36.296651 IP 80.221.171.198.2113 > 62.220.237.114.http: S 803184933:803184933(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,sackOK> 00:01:36.654963 IP 65.55.37.179.36910 > 62.220.237.114.http: S 1372599588:1372599588(0) win 8192 <mss 1460,nop,nop,sackOK> 00:01:36.690083 arp who-has 84.20.154.60 tell 62.220.237.114 00:01:37.690145 arp who-has 84.20.154.60 tell 62.220.237.114 The ping itself says: "Destination Host Unreachable". 3) incoming http requests via eth0 do not work at all. I can post tcpdump results, if someone asks me to. This is a production machine, so I cannot really experiment very much. Now I will go and remove the eth1 card for now. - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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Virtualization as cheap redundancy option?
by Emmanuel Noobadmin 28 Jun '10

28 Jun '10

I'm wondering if virtualization could be used as a cheap redundancy solution for situations which can tolerate a certain amount of downtime. Current recommendations is to run some kind of replication server such as DRBD. The problem here is cost if there are more than one server (or servers running on different OS) to be backed up. I'd basically need to tell my client they need to buy say 2X machines instead of just X. Not really attractive :D So I'm wondering if it would be a good, or likely stupid idea, to run X CentOS machines with VMware. Each running a single instance of CentOS and in at least one case of Windows for MSSQL. So if any of the machines physically fails for whatever reasons not related to disk. I'll just transfer the disk to one of the surviving server or a cold standby and have things running again within say 30~60 minutes needed to check the filesystem, then mount and copy the image. I thought I could also rsync the images so that Server 1 backs up Server 2 image file and Server 2 backs up Server 3 etc in a round robin fashion to make this even faster. But reading up indicates that rsync would attempt to mirror the whole 60gb or 80gb image on any change. Bad idea. So while this is not real time HA but in most situations, they can tolerate an hour's downtime. The cost of the "redundancy" also stays constant no matter how many servers are added to the operation. Any comments on this or is it like just plain stupid because there are better options that are equally cost effective?

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Yum archive for PHP greater than 5.2.1 for CentOS 5.4?
by Jobst Schmalenbach 28 Jun '10

28 Jun '10

Whether I like it or not I need to get a version of PHP that is greater than 5.2.1 as the latest SugarCRM version require this and as I am a module developer I need to have one of the later versions of PHP on my machines. Does anyone know of a reliable and good archive for PHP that provides higher versions than the ones supplied by the upstream provider? Thanks Jobst -- 'Two things are infinite: the universe and human stupidity, and I'm not sure about the first one. - Albert Einstein | |0| | Jobst Schmalenbach, jobst(a)barrett.com.au, General Manager | | |0| Barrett Consulting Group P/L & The Meditation Room P/L |0|0|0| +61 3 9532 7677, POBox 277, Caulfield South, 3162, Australia

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Discuss June 2010