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34753 discussions

CentOS 5.2 VMI support
by Ruslan Sivak 11 Jul '08

11 Jul '08

I'm using VMWare Server 2 RC1 to on top of CentOS 5.2 x86_64 running a CentOS 5.2 i386 guest. I have enabled VMI in VMware, so I guess it won't let me install if VMI wasn't available in the kernel? How do I know whether VMI is supported/enabled and what performance benefits can I expect from it? I'm still not getting full hard drive speeds (only getting about 1/3 when using hdparm -t ). Russ

4 5

CentOS 5.2 - /usr/sbin/httpd: double free or corruption (!prev) error
by J Potter 11 Jul '08

11 Jul '08

Hi List, We've been seeing the following error on a CentOS 5.2 x86_64 / 2.6.18-92.1.6.el5 install (from /var/log/httpd/error): *** glibc detected *** /usr/sbin/httpd: double free or corruption (! prev): 0x00002ad8ebed2d80 *** [Thu Jul 10 19:12:19 2008] [notice] child pid 5261 exit signal Segmentation fault (11) [Thu Jul 10 19:12:48 2008] [notice] child pid 12180 exit signal Segmentation fault (11) ... The following packages are installed: glibc-2.5-24 httpd-2.2.3-11.el5_1.centos.3 mysql-server-5.0.45-7.el5 mysql-5.0.45-7.el5 php-gd-5.1.6-20.el5 php-mysql-5.1.6-20.el5 php-common-5.1.6-20.el5 php-pdo-5.1.6-20.el5 php-cli-5.1.6-20.el5 php-5.1.6-20.el5 php-imap-5.1.6-20.el5 If we remove the php-pdo / php-mysql packages, then the crashes stop. But, we need those packages, so that's not a solution. Any ideas as to what might be causing this? We've tried the obvious things; the only thing that's not "vanilla" here are a few settings in /etc/php.ini (having to do with max execution time and max memory). The php code that's being run does have its share of php warn/notices: PHP Notice: Undefined index: d in [snip] on line 1699 PHP Notice: Undefined index: verbose in [snip] on line 1819 PHP Warning: Invalid argument supplied for foreach() in [snip] on line 1695 So I would not be surprised if it is tickling something out of the ordinary, but it should still not be causing a segfault! Any thoughts as to what's going on here, and how to fix it? I'm tempted to install php 5.2.6 from utterramblings repo, to see if that works around this. Thanks!

1 0

Multiple LVM snapshots
by Raja Subramanian 11 Jul '08

11 Jul '08

I have a Centos 5.2 fileserver running LVM2, ext3 and Samba. I want to periodically snapshot a filesystem and offer them as read only backups to my users. I'm looking for something similar to what's available on Netapp filers. I am successfully able to create snapshots using LVM. But are there any performance issues in having multiple snapshots of the same filesystem at the same time? Is there any other way i can offer filesystem snapshots to my users? Thanks for any guidance! - Raja

1 0

redirecting when behind a firewall
by bruce 11 Jul '08

11 Jul '08

Hi.. I know this isn't a centos/rhel/fedora issue... but i'm hopeful that someone might have an answer!!! thanks VVVVVVVVVV Got a bit of an issue here, that I can't seem to resolve. I have a test domain on a dynamic service (dyndns.org) the test domain is foo.gotdns.com, which i have pointing to my external cable/dsl address. Here's my issue, I would really like to be able to have the external user be able to see multiple websites which might be sitting on different physical machines/apache servers within my network. Behind the modem, I have a firewall which is set up to port-forward the traffic to a machine with my network. So, for my example, the machine is dog (192.168.1.52), and the "foo.gotdns.com" would point to the app on the machine, based on the vhost setup in the dog httpd.conf file. However, I would also like to have multiple external test sites/domains, each of which might point back to sites on different internal servers. The forwarding capability of the router only allows for all wan * (addresses) to be forwarded to a given internal machine. At the same time, the external/internal ports have to match. So i don't have the ability to do something like "forward foo.gotdns.com to machine1, and forward foo2.gotdns.com to machine2" which is exactly what i'm trying to accomplish!! I've been looking into using vhosts, and the redirect functionaility, but I can't seem to get it to work, using the external domain name. So. i'm trying to: -be able to access multiple test sites, on multiple servers from a browser external to my network -be able to access the same sites, from inside my network, using the local/internal namespace -be able to access the same sites, from inside my network, using the external namespace (testing purposes) I've looked high/low for how to accomplish this with no real luck. thanks ps. I've seen others who've been looking for similar solutions, so this would definitely help. ps. I'm able to do a redirect from one server to another, if I restrict to using internal addresses. Just can't get the external stuff to work..

2 1

tape drive
by Pitshou Asingalembi 11 Jul '08

11 Jul '08

hi all, i want to use a compaq sdlt 320 under centos. the tape drive was already installed and after rebooting i was not able to see it(dmesg | grep tape or dmesg | grep scsi). i add the correct module (modprobe st) but i'm not able to use with mt. the st0 file is missing, can someone help to resolve this issue. thanks _____________________________________________________________________________ Envoyez avec Yahoo! Mail. Une boite mail plus intelligente http://mail.yahoo.fr

5 10

XEN virtualization Problem
by Gopinath Achari 11 Jul '08

11 Jul '08

Hi, I am trying to install windows XP on XEN. The Base operating system is Centos 5.1 I used GUI tool Virtual Manager. Once this Virtual manager is started is connected the XEN and QEMU. i used new tab placed below to install a virtual OS ( ex. Winxp.) after passing through the wizard. i wizard option for the partition a created a new 10 GB partition my case /dev/hda8 and then it asked the location where the os image was kept.i created a .iso image using dd command. then i specified the path where this iso image was kept in the wizard. then i told next and then finish button . it opened one more window and the installation of WinXP started. after some time it asked for reboot and it rebooted then it is asking for Winxp OS cd. i inserted into the DVD RW drive i mounted it but still its asking the same. please help me out what to do. is there any addition packages to be installed for recognizing the Cdrom or any other thing to be done. please guide me. Regards, Gopinath

2 1

bind9, SELinux, ServFail
by Meenoo Shivdasani 10 Jul '08

10 Jul '08

I just set up a CentOS 5.2 system with bind9 (9.3.4-6.0.1.P1.el5) and I'm running up against a problem that seems to be related to SELinux. If I set named_disable_trans to 1, everything works as expected, but if I leave it enabled the server will only give me data for the zones for which it is authoritative. For external sites it returns a ServFail error. This is with nslookup and dig. If I start named from the command line with the command "named -u named", the server returns the expected response. tcpdump shows that the server is querying itself and getting a ServFail response. I figure that I'm missing something really basic, but not sure what. Debug logs show this: FAIL: clientmgr @0x2b491728c1d0: createclients clientmgr @0x2b491728c1d0: recycle . . . fctx 0x2b49173153e0(www.google.com/A'): shutdown client 192.168.213.111#33096: view internal: error Succeed: clientmgr @0x2b109771bd30: createclients clientmgr @0x2b109771bd30: create new . . . res 0x2b109778cae0: dns_resolver_prime res 0x2b109778cae0: priming createfetch: . NS fctx 0x2b109781e280(./NS'): create fctx 0x2b109781e280(./NS'): join fetch 0x2b109781e260 (fctx 0x2b109781e280(./NS)): created dns_adb_createfind: found A for name 0x2b109780fa70 in db fctx 0x2b109781e280(./NS'): start res 0x2b109778cae0: dns_resolver_prime fctx 0x2b109781e280(./NS'): try fctx 0x2b109781e280(./NS'): cancelqueries fctx 0x2b109781e280(./NS'): getaddresses dns_adb_createfind: found AAAA for name 0x2b109780fa70 . . . Any ideas? Thanks in advance, M

2 7

/etc/pam.d/system-auth changes in update
by listmail 10 Jul '08

10 Jul '08

I just did an update, and PAM was was one of the modules. Yum has placed /etc/pam.d/system-auth.rpmnew and it's different than the existing file, which is actually a link to system-auth-ac. The files are slightly different, and I'm wondering if the differences are important. I can't find any docs on the reason for the change, so before I spend time becoming a PAM expert, I'm wondering if anyone knows why this change was made, or were it might be documented. Thanks, --Bill

4 4

Kernel is not compiled with IPv6 support?
by Robert Moskowitz 10 Jul '08

10 Jul '08

How did I get this? I am current on my 5.2 upgrades on this system. Running kernel: 2.6.18-92.1.6.el5 I did a service network restart and got: Shutting down interface eth0: [ OK ] Shutting down loopback interface: [ OK ] FATAL: Module off not found. CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support Bringing up loopback interface: [ OK ] Bringing up interface eth0: FATAL: Module off not found. CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support [ OK ] FATAL: Module off not found. CRITICAL : [ipv6_test] Kernel is not compiled with IPv6 support /etc/sysconfig/network has: NETWORKING=yes NETWORKING_IPV6=yes HOSTNAME=onlo.htt-consult.com and /etc/sysconfig/network-scripts/ifcfg-eth0 has: DEVICE=eth0 BOOTPROTO=none HWADDR=00:50:8B:A1:FE:1C ONBOOT=yes DHCP_HOSTNAME=onlo.htt-consult.com IPADDR=208.83.67.148 NETMASK=255.255.255.248 GATEWAY=208.83.67.145 TYPE=Ethernet USERCTL=no IPV6INIT=yes IPV6_AUTOCONF=yes PEERDNS=no A system on this subnet is supposedly running radvd.

5 10

Java Setup
by Clint Dilks 10 Jul '08

10 Jul '08

Hi People I have been following the instructions here http://wiki.centos.org/HowTos/JavaOnCentOS but trying to modify them for jdk-6u7-linux-amd64.rpm but there doesn't see to be a compatible java-1.6.0-sun-compat-*.rpm. Does one exist ? If not can anyone point me to some documentation on how I can manually set up things so alternatives will work allowing multiple Java versions. Thanks

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