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RE: [CentOS] postfix - hostname
by Alex Palenschat 27 Nov '06

27 Nov '06

> On 11/25/06, R Lists06 <lists06(a)abbacomm.net> wrote: > > > From: Guillermo Garron > > > Hi, > > > I have this problem > > > my email server's DNS name is > > > ns1.mydomain.com, and it is registered in the reverse DNS > also with > > > that name, when i installed my server at the hostname i entered > > > centos-server.mydomain.com when i tried to send an email from the > > > root console with > > > > > > # mail root > > > > > > the email is returned saying that > > > > > > root(a)centos-server.mydomain.com, could not be verified > > > > > > i used the command > > > # hostname ns1.mydomain.com > > > and also edited the file. > > > > > > /etc/hosts, > > > but i have the same result, the hostname did not change, i even > > > restart my server with no luck. what am I missing? > > > regards, > > > Guillermo. > > > PS my server is a CentOS 4.4, with postfix > > > Guillermo Garron The hostname is stored in /etc/sysconfig/network and when you are dealing with postfix there is a line in the /etc/postfix/main.cf file that needs to be edited that starts with myorigin= alex

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grep from /
by R Lists06 27 Nov '06

27 Nov '06

Interesting If someone tries to grep a whole Centos 4 server as root from / for a single word, will you see errors like this? :-) WARNING: Kernel Errors Present Buffer I/O error on device fd0p10...: 51 Time(s) Buffer I/O error on device fd0p11...: 51 Time(s) Buffer I/O error on device fd0p12...: 51 Time(s) Buffer I/O error on device fd0p16...: 102 Time(s) Buffer I/O error on device fd0p24...: 51 Time(s) Buffer I/O error on device fd0p28...: 51 Time(s) Buffer I/O error on device fd0p32...: 51 Time(s) Buffer I/O error on device fd0p4,...: 102 Time(s) Buffer I/O error on device fd0p44...: 51 Time(s) Buffer I/O error on device fd0p48...: 102 Time(s) Buffer I/O error on device fd0p52...: 51 Time(s) Buffer I/O error on device fd0p56...: 51 Time(s) Buffer I/O error on device fd0p76...: 204 Time(s) Buffer I/O error on device fd0p8,...: 51 Time(s) Buffer I/O error on device fd0p84...: 51 Time(s) Buffer I/O error on device fd0p92...: 51 Time(s) :-) - rh -- Robert - Abba Communications Computer & Internet Services (509) 624-7159 - www.abbacomm.net

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Looking for assistance
by System Admin 27 Nov '06

27 Nov '06

We have about 5 servers spread out throughout the country: 2 Centos 4.4, 1 Red Hat and 2 windows machines- looking for some good ideas for a back-up solution. Our servers hold a lot of data, but only a small portion of it is crucial on any given day. That crucial portion is always changing (for example, this week the crucial files all relate to November- current and previous projects, and the next project in early December). What we need to have is a backup solution that would allow us to roll back to any given day (about four weeks of daily history). Bare-metal backups are a must. Our ideal solution would be to find someone who could design and implement a system for us. All ideas and suggestions are welcome.

9 8

CentOS default accounts in /etc/passwd
by Paul Stepowski 26 Nov '06

26 Nov '06

Hi, I've noticed that the /etc/passwd file on CentOS 4.4 contains the users: sync, shutdown, and halt. The users' shells are set to /bin/sync, /sbin/shutdown, and /sbin/halt respectively. What are these accounts used for? Thanks, Paul

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SATA Native Command Queuing
by Matt 26 Nov '06

26 Nov '06

Does CentOS support NCQ on SATA drives? If so is there something I must do to turn this support on? Matt

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cluster service
by John R Pierce 25 Nov '06

25 Nov '06

I've setup the CentOS version of the RH Cluster Service on a pair of centos 4.4 i386 test boxes... wanting to do high availabilty stuff. its working, I've added a virtual IP and a fiberchannel hosted e3fs file system thhat either can mount, if I manually crash or reboot one, this IP and FS mount on the other, awesome. the servers are connected to the storage via a QLogic SANbox 5600 fiberswitch, and I've added a SANbox2 'fence device' to the cluster, with its IP and login/password... but I don't understand how to configure the SANbox or the fencing agent so that it knows how to map these two servers to the zones or zonesets on the SANbox. right now everything on the SANbox is in the same zone (these two plus a few other servers plus the shared storage controller which also has some LUNs that are only accessible by a couple Sun servers running Solaris). what am I missing? I did see the man page on fabric_sanbox2, but dont see how that applies via system-config-cluster ...

1 1

"undefined symbol: _pam_make_env"
by ness 25 Nov '06

25 Nov '06

Hello, A while ago I downloaded and compiled PAM 0.99.x and installed it over the default CentOS PAM installation. Of course, this premature decision led to root and FTP access being fully locked down and inaccessible. When I `su -`, it prints "su: incorrect password" before it gives me the chance to type a password. When I `sudo su -`, it prints "sudo: pam_authenticate: Module is unknown". The most elaborate error from that point on is in /var/log/secure, which prints the following when I supply valid FTP log in credentials: Nov 24 19:57:07 ded sudo: PAM unable to dlopen(/lib/security/pam_stack.so) Nov 24 19:57:07 ded sudo: PAM [error: /lib/security/pam_stack.so: undefined symbol: _pam_make_env] Nov 24 19:57:07 ded sudo: PAM adding faulty module: /lib/security/pam_stack.so I've tried reinstalling PAM via yum, it's dependencies, and it's furthest dependencies with no apparent success. Does anyone know how this can be fixed without formatting the entire system? Thanks, --ness

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Need SAN suggestion
by Mindaugas 25 Nov '06

25 Nov '06

Hello, It is not total off-topic since almost all connected servers will be RHEL and CentOS. :) We are considering to purchase new storage system. The most probably we will be choosing between HP (EVA6000), EMC (CX3-20C) and Hitachi (similar model). iSCSI connection is also required. What are your experienced with listed systems? What to avoid? What ot expect? Now I just know that sequential read/write preformance on EVA is poor. :) Thanks, Mindaugas

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Relay with Sendmail
by Denis Croombs 25 Nov '06

25 Nov '06

I need to only accept emails on my MAIN POP/IMAP server from 3 servers (under my control (front line MX servers)) & local users who have local POP accounts. ALL other emails need to be blocked. What is the best way of doing this ? Thanks Denis

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RE: [CentOS] RAID 1 not boot when disconnect a disk
by Emmanuel Fournier 24 Nov '06

24 Nov '06

Hi Roberto, > I have a clean CentOS 4.4 disk and I have setup a RAID 1 with > two IDE disk. > > The system RAID 1 boot fine but when I disconnect a disk (the first > disk) the system not boot. The screen goes black and not boot anything > (grub not boot). > > Can anybody help me ? What I doing wrong ?? Excuse my english .... May be you have to manual install grub loader on the second disk (hdc) : have a look here : http://www.gnu.org/software/grub/manual/html_node/Installing-GRUB-natively.… and use hd1 instead of hd0. And if you config your BIOS to boot on any IDE drive found, i think it'll be ok See you ! ______________________________________________ Emmanuel Fournier - ICT mailto:fournier@ict-toulouse.asso.fr

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