Discuss December 2008

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247 participants
257 discussions

TimeZone Mystery on a virtual dedicated server
by Ami Mahloof 31 Dec '08

31 Dec '08

Hi, I have a weird problem woth the time zone on my virtual (goDaddy) dedicated server I had to setup the timezone using system-config-date to GMT+7 i am in NY (GMT-5) when i do GMT-5 i get all the times 2 hours ahead seems like there's something im missing here If i add an event to my web app let's say 7:30 - 8:15 , the only way for me to show it right is GMT+7 can anyone help me figure out what am i missing here??? Thanks Ami

5 4

Xen DomU console connection
by James B. Byrne 30 Dec '08

30 Dec '08

Dom0 OS=CentOS-5.2_X86_64 Dom1 OS=CentOS-5.2_X86_64 I have a desktop machine running the xen kernel, Dom0. I have created a virtual machine on that host, Dom1. From my console session on Dom0 I can open a GUI console for Dom1 but I cannot resize the actual screen area. I can make the virtual console window larger but the screen stays centered at the same size while the margins increase in width. I would like to simply switch my entire desktop display from the Dom0 to Dom1 (together with the keyboard and mouse of course) and then back to Dom0 again when I am done. I suspect that this is not possible, but if it is then surely someone here will know. If I cannot actually switch desktops between domains then is there another technique available to accomplish much the same thing? I would like to use Dom1 for software development using visual editors and such. Running these inside the virtual console window is not workable, mainly due to the limited display size and the erratic behaviour of the mouse. Regards, -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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i386 packages on x64 servers
by German Andres Pulido Franco 30 Dec '08

30 Dec '08

Hi! I have some servers, all running centos 5.2 x64 with current updates. None of the servers has installed packages that are not part of the centos regular packages. They were installed using the "server" packages at install, therefore there is no X server, GNOME, KDE or any other non-server stuff. However, I recently noted that the servers have the x64 _and_ the i386 versions of some packages installed, for instance: krb5-libs-1.6.1-25.el5_2.1 and pam_krb5-2.2.14-1.el5_2.1. My question is: If I have no 32 bits software installed on these machines, why are such libraries installed? and can they be safely removed from the servers? Thanks in advance. GERMAN ANDRES PULIDO F. Ingeniero de Proyectos Global Technology Services - GTS S.A. ------------------------------------- Tel: (571) 658 34 10 ext 110 Cel: (573) 300 265 23 03 Carrera 7b No. 123-46 Bogotá-Colombia Sitio Web: www.gtscolombia.com

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system config report
by David Miller 30 Dec '08

30 Dec '08

Long ago when I was an AIX admin we had a script we ran every 6 months or so and it created what we called the "System Book". It had every possible configuration option. While acknowledging that on a whole it was overkill documentation, if we ever had to rebuild the systems we knew *exactly* how the old one was set up to compare it to if we had problems. I'm looking to do something similar for my CentOS boxes. Or better yet, see if someone has already done something similar. I've poked around google and sourceforge on and off for a couple of months but haven't found much. The discussion lately about 'hwinfo' jogged my memory. Anyone know of something like this? A template, even? An old project that hasn't been updated but could be brought up to date? Thanks for any suggestions. Dave

5 6

xorg-x11-drv-nouveau for CentOS?
by Timo Neuvonen 30 Dec '08

30 Dec '08

Is there a way to use "Nouveau" (open source Nvidia) driver in CentOS 5 ? "nv" seems to support only the lowest resolutions thru the dvi output (NV44 chip), and I don't like the idea of installing propiertary Nvidia drivers. This way I came to Nouveau. I had a look at some Fedora rpms, but they needed something CentOS obviously doesn't have: # rpm -ivh xorg-x11-drv-nouveau-2.1.6-1.fc8.x86_64.rpm kernel-drm-nouveau = 10 is needed by xorg-x11-drv-nouveau-2.1.6-1.fc8.x86_64 Regards, Timo

7 14

IPv6 forwarding and ip6tables
by Robert Moskowitz 30 Dec '08

30 Dec '08

I am running multiple IPv6 subnets here in my testbed. My IPv6 'router' is a Centos box with IPv6forwarding turned on. It is also my RADVD server (over multiple VLans), and Miredo server/relay. I thought I had a simple ip6table setup that protected the box and let it forward. Well I am wrong. I got my previous DNS over IPv6 working on the DNS server, then tried to get it working from another box. After a couple hours fighting with it, I finally figured out that my Centos IPv6 router was rejecting the IPv6DNS queries, not forwarding them. I turned off ip6tables and the DNS lookups worked just fine. So I thought, well Shorewall6 beta is out, let's go with it already. I check out the shorewall discussions and discover you need at least the 2.6.25 kernel for Shorewall6. When I mentioned my dilemma, I was told that "2.6.18 doesn't support stateful IPv6 firewalling at all!" Just great...... When is that Centos 6 going to happen???? :( Anyway, the challenge for now: What do I put into ip6tables so that any IPv6 traffic that comes in any of the vlans on eth1 can go out any of the vlans on eth1?

1 0

DNS resolver over IPv6
by Robert Moskowitz 30 Dec '08

30 Dec '08

I have a Centos server that is running BIND and has IPv6 global addresses. I have entered a number of AAAA records into this copy of BIND in a local view and zone (tld is htt). Over IPv4, I have no trouble with nslookup ('nslookup - 127.0.0.1' and 'nslookup - 192.168.128.55'). I get the AAAA records back. But if I try to use the IPv6 address of the system I get a time out. Both from nslookup and from ping6. I setup /etc/resolv.conf as shown at: http://docsun.cites.uiuc.edu/sun_docs/C/solaris_9/SUNWaadm/SYSADV5/p13.html (the only hit I got on configuring resolv.conf for an IPv6 DNS server). I have turned off both ip6tables and iptables so it is not a firewall issue. Even 'nslookup - <ipv6 addr>' does not work. I seem to recall a problem with nslookup supporting udp over IPv6, but ping6 should not have that problem. This is all on the single system running BIND. I figure i got to get that working before worrying about other systems!

4 7

cluster - ip address lost when service stopped
by Fabio Macchi 30 Dec '08

30 Dec '08

Hi all, I'm trying to setup a cluster of 2 machines with Centos 5.2 to host a postfix+spamassassin+clamav+mailscanner service. Below cluster software versions rgmanager.i386 2.0.38-2.el5_2.1 installed cman.i386 2.0.84-2.el5_2.2 installed Every machine (hp blade server ) has 4 interfaces, bounded in this way: Eth0, eth1 -> bond0 -> connection for public service ( 10.0.181.x ) Eth2,eth3 -> bond1 -> connection for intra-cluster communication ( 192.168.44.x ) bond0 Link encap:Ethernet HWaddr 00:21:5A:48:DA:BE inet addr:10.0.181.41 Bcast:10.0.181.255 Mask:255.255.255.0 inet6 addr: fe80::221:5aff:fe48:dabe/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:85 errors:0 dropped:0 overruns:0 frame:0 TX packets:86 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:12963 (12.6 KiB) TX bytes:9144 (8.9 KiB) bond1 Link encap:Ethernet HWaddr 00:1F:29:6D:7D:08 inet addr:192.168.44.41 Bcast:192.168.44.255 Mask:255.255.255.0 inet6 addr: fe80::21f:29ff:fe6d:7d08/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:29 errors:0 dropped:0 overruns:0 frame:0 TX packets:223 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4612 (4.5 KiB) TX bytes:31746 (31.0 KiB) Then I've created a new Mail service with these local resources: - Ip address 10.0.181.3 - Script /etc/rc.d/init.d/MailScanner - GFS file system on a SAN Service start, but the problem is that, when I stop the service, external ip address is removed from bond0. What may cause this ? I don't find any helpful information in /var/log/messages, what may I check to investigate ? I've not setted any fence device, as I have configured GFS resource internally to the service ( GFS partition is mounted only from the server running the service ): is this a wrong design ? Has anyone already setup this kind of service on a Centos cluster ? Many thanks in advance for any hints. Fabio

3 6

2 internet connections and one for backup
by Mariusz 30 Dec '08

30 Dec '08

I've got 2 internet connections but unfortunately not the same - 6mbit and 1 mbit. My default is 6mbit and I want to create backup connection (1mbit). How can do it? Has anybody done it? My perfect scenario is that my network uses 1mbit if (only) 6mbit fails and it switches automatically. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

11 17

2 default gateway?
by Mario 30 Dec '08

30 Dec '08

I've got 2 internet connection, one is direct connected to my server and the second i use by default gateway. How can I create 2 default gateway? I want to add default gateway my second internet. How can I solve problem which gateway is used? Mario

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Discuss December 2008