Discuss January 2012

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222 discussions

need help to build livecd and create success iso file but it hang
by ha do 28 Jan '12

28 Jan '12

Hi all my environment: 1/ windows 7 OS system 2/ use virtual box install the host centos system i try to make a centos livecd and i follow the step 1/ create file: vi /etc/yum.repos.d/centos-livecd.repo and the content of file: # Name: CentOS LiveCD repository [livecd] name = CentOS $releasever - LiveCD baseurl = http://www.nanotechnologies.qc.ca/propos/linux/centos-live/$basearch/live enabled=1 protect=0 gpgkey = http://www.nanotechnologies.qc.ca/propos/linux/RPM-GPG-KEY-PGuay2010 2/ yum install livecd-tools syslinux anaconda-runtime 3/ create file alochym.ks and content of file: lang en_US.UTF-8 keyboard us timezone US/Eastern auth --useshadow --enablemd5 selinux --enforcing firewall --disabled repo --name=a-base --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/os/$basearch repo --name=a-updates --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/updates/$basearch repo --name=a-extras --baseurl=http://mirror-fpt-telecom.fpt.net/centos/5/extras/$basearch repo --name=a-live --baseurl=http://www.nanotechnologies.qc.ca/propos/linux/centos-live/$basearch/live %packages bash kernel syslinux passwd policycoreutils chkconfig authconfig rootfiles comps-extras xkeyboard-config openssh 4/ run command : LANG=C livecd-creator --config=/mnt/alochym.ks --fslabel=CentOS-mini 5/ download the file CentOS-mini.iso to windows 7 6/ use virtual box create new virtual machine with CentOS-mini.iso as cdrom the log of create livecd : http://pastebin.com/Z5BFASXa the problem is when i use the CentOS-mini.iso with new virtual machine and the virtual manchine hang when automatic boot to 0 second can somebody help me Thank you

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After a long break, one more try at bond/bridge nics
by Bob Hoffman 28 Jan '12

28 Jan '12

took a couple months off due to road blocks, hoping a fresh look would allow me to use my server as desired. I have three ports, eth0-2 over two nics. I want to bond them, and then use a bridge to connect to virtual machines on the virtual host computer. Never having done this, I am confused on some parts. Here is where I am at now and any pointers helpful. Single server, centos 6.x My issue is do I add the ip address of the virtual host and where? Do I not add any of the ip addresses of the virtual machines? (thus they will be looked for via the bridge?) Each virtual machine will be getting its own ip address as it will be used for a website. here is the basic configuration I am looking at, with some things not added like hwaddress and a few tweaks (zeroconf?) am I even close? I admit I have never done this and have no mentor other than this exceptional mailing list. ============================ /etc/modprobe.conf alias bond0 bonding options bond0 mode=balance-alb miimon=100 ============================ ============================ bond0 DEVICE=bond0 BOOTPROTO=none BRIDGE=br0 ONBOOT=yes BONDING_OPTS="mode=1 miimon=100 primary=eth0" ============================ ============================ br0 DEVICE=br0 TYPE=Bridge BOOTPROTO=none IPADDR=<my virtual host IP address?> NETWORK=xxx.xx.xx.xxx BROADCAST=xxx.xx.xx.xx NETMASK=255.255.255.0 ONBOOT=yes GATEWAY=xx.xxx.xxx.xx ============================ I did not add the hwaddress to the items below. ======================================== eth0 DEVICE=eth0 USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none eth1 DEVICE=eth0 USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none eth2 DEVICE=eth0 USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none =========================================

2 5

fsck
by Steve Clark 27 Jan '12

27 Jan '12

Hello, We are running units in the field that are headless. Sometimes we get units returned that we when we boot them up have some type of filesystem inconsistency that the default preen doesn't fix but running fsck -y does. I want to eliminate the -p (preen option) and always do the -y option anyone know where to make this change? Thanks, -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark(a)netwolves.com http://www.netwolves.com

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Confusion over sendmail and smtp auth on a 6.2 server - solved
by Steve Campbell 27 Jan '12

27 Jan '12

Amazing what you find when you sit down and read CAREFULLY. The answer to generating a sendmail certificate was in the sendmail.mc file. Same place as it has been for quite some time. Sorry for the bother. steve

2 1

Re: [CentOS] Confusion over sendmail and smtp auth on a 6.2
by Gerald Braun 27 Jan '12

27 Jan '12

While certainly Centos 6.2 specific, I found the following How-tos very helpful in setting up a similar Sendmail/Dovecot configuration on Centos. http://www.falkotimme.com/howtos/sendmail_smtp_auth_tls/index.php http://www.brennan.id.au/12-Sendmail_Server.html Hope it helps. Gerald > I'm reading a lot on how to setup my smtp auth on a new Centos 6.2 > server. I want to use sendmail and have this running on a Centos 3 > machine now, so it's not new stuff to me. > > Unfortunately, the more I read, the more confusion I seem to have. > Firstly, how to generate my certificates. A good recommendation or howto > would be in order. I think most of the confusion here comes from the > commented names of files used in sendmail.mc for all the auth files. As > far as I can tell, the encryption length is the only change I need > (going to a minimum of 2048 bits) from the old system generation. Those > "pem" files throw me a bit, though. > > Secondly, I'm reading DoveCot has a problem with security and that I > need to run something other than ? (Cyrus, Courier, etc) to make this > work. I typically don't run imap security, only on smtp, so I'm not sure > if there's to be interference between the two. Since postfix is the > default now on Centos 6.2, what should I look for by changing it back to > sendmail when it comes to smtp auth? > > I only authenticate users that are not in the building on our network to > allow them to send email. They're free to use pop or imap to retrieve > their email without authentication. > > Thanks for any clarity on this. > >steve campbell

1 0

6.2 install disk jumps to Gnome Partition Manager
by Paul Johnson 27 Jan '12

27 Jan '12

Have you seen this problem? I downloaded CentOS-6.2-i386-bin-DVD1.iso verified the md5sum, wrote on a DVD, verified that against the iso. When I boot a computer with that disk, It does not present the usual Linux install menu, it jumps to a thing called Gnome Partition Manager, and that offers a weird sort of "live disk" interface. There is no way to start an install, so far as I can see. -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas

2 1

Having problems with sudoers
by Steve Campbell 27 Jan '12

27 Jan '12

I've got a Cento 6.2 server I'm putting together that will become a mailserver. It will have on it MailScanner and MailWatch for MailScanner. I'm using the latest stuff available and have run into a problem with changes I need to make in the /etc/sudoers file. It doesn't seem to take affect after I make the changes, so either the syntax within the file has changed or the way Centos 6.2 actives changes is different, but it's saying that "sudo: sorry, you must have a tty to run sudo". I'm trying to enable the user "apache" to have the ability to run an executable from a web page. One of the common solutions is to do the following: Defaults:apache !requiretty apache ALL = NOPASSWD:/program.name also tried: Defaults !requiretty Defaults visiblepw Anyone have a suggestion? I've got to research the tty stuff for now to ensure there is one available, but beyond that, I'm stumped. Thanks for any help. steve campbell

4 3

Confusion over sendmail and smtp auth on a 6.2 server
by Steve Campbell 26 Jan '12

26 Jan '12

I'm reading a lot on how to setup my smtp auth on a new Centos 6.2 server. I want to use sendmail and have this running on a Centos 3 machine now, so it's not new stuff to me. Unfortunately, the more I read, the more confusion I seem to have. Firstly, how to generate my certificates. A good recommendation or howto would be in order. I think most of the confusion here comes from the commented names of files used in sendmail.mc for all the auth files. As far as I can tell, the encryption length is the only change I need (going to a minimum of 2048 bits) from the old system generation. Those "pem" files throw me a bit, though. Secondly, I'm reading DoveCot has a problem with security and that I need to run something other than ? (Cyrus, Courier, etc) to make this work. I typically don't run imap security, only on smtp, so I'm not sure if there's to be interference between the two. Since postfix is the default now on Centos 6.2, what should I look for by changing it back to sendmail when it comes to smtp auth? I only authenticate users that are not in the building on our network to allow them to send email. They're free to use pop or imap to retrieve their email without authentication. Thanks for any clarity on this. steve campbell

1 0

sa-update error with perl
by email builder 26 Jan '12

26 Jan '12

Hi, Running CentOS5 with SpamAssassin v3.3.1-2.el5 installed via yum I remember getting this error a while ago, and it was fixed, but now it's happening again: Subroutine Net::DNS::Resolver::Base::AF_INET6 redefined at /usr/lib/perl5/5.8.8/Exporter.pm line 65. at /usr/lib/perl5/vendor_perl/5.8.8/i386-linux-thread-multi/Net/DNS/Resolver/Base.pm line 65 The results I get from Google regarding this are all circa 2008. The only hints I can find seem to suggest to remove perl-IO-Socket-INET6, but trying to do so using yum (I don't want to start using another method of package management) tells me that spamassassin is a dependency and will also be removed - obviously undesirable. Perl is up to date on the machinge. Am I the only one seeing this? What can I do to fix it?

8 46

Local privilege escalation bug in kernel
by Frank Cox 26 Jan '12

26 Jan '12

Do we know if this bug affects Centos? http://www.techworld.com.au/article/413300/linux_vendors_rush_patch_privile… The article states that it affects kernel 2.6.39 and above, but since RH backports so much stuff I'm not sure if this would actually include the Centos kernels. -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com www.creekfm.com - FIFTY THOUSAND WATTS of POW WOW POWER!

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Discuss January 2012