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Building a custom install CD
by Fred Moyer 09 Jun '09

09 Jun '09

Greetings, I am looking for resources on how to build my own Centos install CD for a preselected package set that I want to install. I think Red Hat may have had this functionality at some point but it has been a while since I have needed to do this. I found this on how to build my own kernel - http://wiki.centos.org/HowTos/BuildingKernelModules - which I will need to exercise as well, but I want to build my own .iso that I can run a kickstart or similar mechanism from. Thanks in advance.

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Re: [CentOS] Networking Issue
by nate 09 Jun '09

09 Jun '09

Joseph L. Casale wrote: > Now it seems there is still one last hurdle, when the connection is yanked > to simulate a complete outage, asterisk still goes down. I can only assume > this happens now as a result of no default gateway? check the logs? run strace on the process? run tcpdump on the interface(s) to see what traffic it is trying to transmit? > > Would setting up a silly route for 0.0.0.0/0 to say 127.0.0.1 for the > internal > nic in /etc/sysconfig/network-scripts/route-eth1 with a metric higher than > what the ISP's dhcp servers default gw would be possibly cure this? My hope > is that when the wan nic goes down, a route is still available. Last I checked the 'metric' number in the linux routing table is really only used when your using a routing daemon. as far as default routes go, it should not have any impact. I suspect the route is not the issue, I suspect that the app is trying to talk to something external and then fails, it will fail the same if you try to point it to a router that goes nowhere. tcpdump should be able to tell you who the host is trying to talk to. strace might reveal why. nate

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Networking Issue
by Joseph L. Casale 09 Jun '09

09 Jun '09

Need some opinions on making a multihomed box more resilient to failure. This server runs asterisk and performs nat and firewalling for an office. Its wan nic is plugged directly into a cable modem and I am stuck with it being configured as a dhcp client. The lan nic services a small office, and has a static IP but of course, no default gateway. When an internet outage occurs, asterisks sip stack tanks and the pbx dives. So I have setup fqdn's/ip's in the hosts file for all sip peers it will attempt to resolve, and setup a local dns with all rfc1912 zones so every query asterisk can possibly make will be answered locally. Now it seems there is still one last hurdle, when the connection is yanked to simulate a complete outage, asterisk still goes down. I can only assume this happens now as a result of no default gateway? Would setting up a silly route for 0.0.0.0/0 to say 127.0.0.1 for the internal nic in /etc/sysconfig/network-scripts/route-eth1 with a metric higher than what the ISP's dhcp servers default gw would be possibly cure this? My hope is that when the wan nic goes down, a route is still available. I can't think of any other network shortcoming that is left when that external nic goes down, I am hoping this is finally it, so asterisk will stop core dumping and yelling "Serious Network Trouble". Thanks! jlc

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Disabling IPv6 in CentOS 4.7
by Stephen Harris 08 Jun '09

08 Jun '09

I thought I'd done that standard stuff /etc/modprobe.conf: alias net-pf-10 off alias ipv6 off /etc/sysconfig/network: NETWORKING_IPV6=no But on reboot I still see ipv6 entries against the eth devices, ipv6 module is still loaded, and sit0 tunnel is present. What needs to be done to disable ipv6? -- rgds Stephen

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Cannot get LD_LIBRARY_PATH to work under NX (freenx)
by Andrzej Szymanski 08 Jun '09

08 Jun '09

Hello, I'm trying to get the LD_LIBRARY_PATH set from .bash_profile (Centos 5.3 fully updated). This is a part of my .bash_profile: export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/szyman/omnet/omnetpp-2.3p1/lib export R_HISTSIZE=2000000000 Everything works fine under standard ssh login, but under NX client the LD_LIBRARY_PATH variable is missing (the R_HISTSIZE is exported properly). Any hints? Thanks, Andrzej

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LZMA for CentOS 5.3 repository or source or rpm
by Rob Townley 08 Jun '09

08 Jun '09

i need lzma compression for CloneZilla, but have not found it in any CentOS repository. The Finnish website was down and when up, it does not do much english.

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Basic setup for vsftpd ?
by Niki Kovacs 08 Jun '09

08 Jun '09

Hi, I'm currently fiddling with G4U (Ghost for Unix), and I need to setup a local FTP server in order to get it to work. # yum groupinstall "FTP Server" --> installed vsftpd Here's what I'd like to do : * no anonymous access * only one user (user 'install' / pass 'install') The machine I'm installing it on has a static IP ok (192.168.1.252/255.255.255.0). I tried to fiddle with the various configuration options in vsftpd.conf, but to no avail. Googled quite some, but the information I found doesn't seem reliable, more like contradictory. One detail: this isn't a publicly accessible machine, e. g. it's not out there on the wild internet, only on the LAN, so there's no special security considerations. Any suggestions ? Niki Kovacs

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Re: [CentOS] libwpd/libwpd-devel deps screwed?
by Radu-Cristian FOTESCU 08 Jun '09

08 Jun '09

Oh, sorry, fixed it with rpm -iv --force libwpd-0.8.7-3.el5.i386.rpm rpm -iv --nodeps libwpd-devel-0.8.7-3.el5.i386.rpm I suppose the RPM database is too fragile by design. R-C __________________________________________________________________ Make your browsing faster, safer, and easier with the new Internet Explorer® 8. Optimized for Yahoo! Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/

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please help: Linux Kernel must be loaded before initrd
by Rudi Ahlers 08 Jun '09

08 Jun '09

Hi, One of my servers in a IDC in another country mysteriously went down this morning, and when I contacted the IDC, I was told that XEN doesn't boot up, as follows: [QUOTE] This is error message on the screen " Error 19: Linux Kernel must be loaded before initrd" Server is currently up with 2nd kernel. Please check the grub.conf. [/QUOTE] Looking at grub.conf, I see the following: #boot=/dev/hda default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-128.1.10.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-128.1.10.el5 ro root=/dev/VolGroup00/LogVol01 ide0=noprobe ide1=noprobe initrd /initrd-2.6.18-128.1.10.el5.img title CentOS (2.6.18-128.1.10.el5) root (hd0,0) kernel /vmlinuz-2.6.18-128.1.10.el5 ro root=/dev/VolGroup00/LogVol01 ide0=noprobe ide1=noprobe initrd /initrd-2.6.18-128.1.10.el5.img title CentOS (2.6.18-128.el5) root (hd0,0) kernel /vmlinuz-2.6.18-128.el5 ro root=/dev/VolGroup00/LogVol01 ide0=noprobe ide1=noprobe initrd /initrd-2.6.18-128.el5.img Then on another server, I see the following in grub.conf: #boot=/dev/sda default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-8.1.15.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-8.1.15.el5 module /vmlinuz-2.6.18-8.1.15.el5xen ro root=/dev/VolGroup00/root module /initrd-2.6.18-8.1.15.el5xen.img title CentOS (2.6.18-8.1.15.el5) root (hd0,0) kernel /vmlinuz-2.6.18-8.1.15.el5 ro root=/dev/VolGroup00/root initrd /initrd-2.6.18-8.1.15.el5.img title CentOS (2.6.18-8.el5) root (hd0,0) kernel /vmlinuz-2.6.18-8.el5 ro root=/dev/VolGroup00/root initrd /initrd-2.6.18-8.el5.img On both kernels, I can see that initrd is loaded 2nd, as it should. So the error doesn't make sense. The BIG problem is that the server is on another continent, and their support is totally useless. I have actiall ordered a new server, from another IDC and got it last night, but need XEN to work on this server in order to move the domU's across. Can anyone see anyting wrong with this? Google has revelaed the obvious, that the initrd is incorrectly loaded, but according to the grub.conf that I have, it should be loading properly. -- Kind Regards Rudi Ahlers CEO, SoftDux Hosting Web: http://www.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Random server reboot after update to CentOS 5.3
by Peter Hopfgartner 08 Jun '09

08 Jun '09

Dear ML We upgraded a Dell Poweredge PE 1950 Server the 8th of May. Since then the server rebooted 3 times without external cause (it is located in a server farm with redundant power supply etc.). Looking at the servers monitoring infrastructure with Dell's own OpenManage tools, I get strange errors: [root@servernew ~]# omreport system esmlog (....) Severity : Critical Date and Time : Mon May 11 17:46:59 2009 Description : System Software event: run-time critical stop was asserted Severity : Critical Date and Time : Fri May 15 21:07:57 2009 Description : System Software event: run-time critical stop was asserted Severity : Critical Date and Time : Wed May 20 21:00:53 2009 Description : System Software event: run-time critical stop was asserted (...) This class of errors never happened before in over a year that the server is running. There is no mention of any anomaly, except the boot messages itself, in /var/log/messages. The server runs the 64 bit flavor of CentOS hosting some XEN virtual machines and some PostgreSQL and MySQL databases. It run without any issues with CentOS 5.1 and 5.2. I interpreted these issues as some kernel/software related problem, but do not know how to make a more accurate diagnosis of the problem. Can anybody give me some hint? Has anybody had some similar issue? Regards, Peter -- Dott. Peter Hopfgartner R3 GIS Srl - GmbH Via Johann Kravogl-Str. 2 I-39012 Meran/Merano (BZ) Email: peter.hopfgartner(a)r3-gis.com Tel. : +39 0473 494949 Fax : +39 0473 069902 www : http://www.r3-gis.com

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