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Turn off fetchmail warning?
by Timothy Murphy 29 Jan '12

29 Jan '12

Is there any way of turning off the fetchmail warning ---------------------------------- fetchmail: Warning: the connection is insecure, continuing anyways. (Better use --sslcertck!) ---------------------------------- which I get when fetching imap mail from my college department? I know they should get a root certificate, but I'm told they are looking into it, but that could take forever. I know I could just filter out the warnings in .fetchmailrc . But I'm wondering if there is any option in fetchmail to turn them off? I don't see any in the man page. -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College Dublin

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Booting custom kernels in centOS6.0
by kasi viswanath 28 Jan '12

28 Jan '12

Hi, I'm using the procedure described in building customer kenrels centOS5.0. Except for one step where spec file to comment 25 lines from 638, I did every thing. I got rpm files in ~/rpmbuild/RPMS. After installing kernel-firmeware, kernel, kernel-headers, kernel-devel packages it creates OS entry in /boot/grub/menu.lst following "defaults 0" directive. After reboot: 1. Grub is not showing up new kernel in grub menu 2. Manually removing old kernel title in menu.lst, won't booting new kernel. kernel: 2.6.32.71.el6.x86_64. Are there any issues? thanks and regards, Viswa

2 1

New DRBD packages in CentOS-Testing
by Johnny Hughes 28 Jan '12

28 Jan '12

DRBD Users, There are new DRBD (drbd83) packages for CentOS-5 in the CentOS-Testing repository. The packages are located here: http://dev.centos.org/centos/5/testing/i386/RPMS/ http://dev.centos.org/centos/5/testing/x86_64/RPMS/ http://dev.centos.org/centos/5/testing/SRPMS/ The versions are: drbd83-8.3.12-1.el5.centos* drbd83-kmod-8.3.12-1.el5.centos* Please test these so we can move them into CentOS Extras. NOTE: There are 3 other versions (8.3.9, 8.3.10-1 and 8.3.10-2) that never got moved out of testing and 8.3.8 is currently the version in Extras ... PLEASE, lets get these tested as if they work, people will want them. Thanks, Johnny Hughes

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Can anyone talk infrastructure with me?
by Jason T. Slack-Moehrle 28 Jan '12

28 Jan '12

Hi All, I started a 501c3 (not-for-profit) organization back in February 2011 to deal with information archival. A long vision here, I wont bore you with the details (if you really want to know, e-mail me privately) but the gist is I need to build an infrastructure to accommodate about 2PB of data that is database stuff, stored video, crawl data, static data sets, etc. Right now in my testing of the software I can easily bang down 300+gb a month of data. I have a Comcast business circuit and so far so good with them. I am investigating Sonic.net for a "Business T" solution as they call it. As part of their deal, they want to lease me a "Managed Cisco Router". I know, i know which one? Well none of the Sales people know and they have to find out for me! They also told me that with this router, there is no reason to run my own dedicated firewall. Which I have been investigating recently as well. I do have cisco PIX experience and I am not sure how much of that translates to real world use now-a-days. I have not touched a PIX in 5 years. So I am confused and I would appreciate some advice. So this Cisco device they want to put in front of everything. I then wanted to run my own dedicated firewall (a custom build box probably thanks to John Pierce's advice about pfSense recently). Coming off that dedicated Firewall, I need a DMZ for web-serving, a private VLAN for database servers, etc and a private VLAN for my computers here that I use to do all the work behind the NPO. Here is where I draw some confusion. Where do items such as Varnish Cache, HAProxy go in relationship to firewall, DMZ, etc? HAProxy is a load-balancer, so It should do in front of web-servers so it can decide which web-server to send the traffic to? Varnish Cache is all about caching commonly used resources so it seems that this has to go in front too? Can this be the same box realistically? How does one spec this box out? Database servers and storage servers would go on the private VLAN? I am building a box to store all the data (mysql, video, crawl data, static datasets) and I strongly think it might be a backBlaze POD running CentOS. I know this is not the best list to ask these types of questions on, so if there is a better place besides ServerFault or SuperUser.com, I would appreciate knowing. I just find the folks here have so much knowledge besides CentOS. I look at some of these organizations that talk about their infrastructure like WikiMedia Foundation, StackOverflow and I sort of really become quickly amazed that I could full the garage in my house with equipment easily and my wife wont like that! -Jason

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Cannot remove lvs associated with deleted vm guests
by James B. Byrne 28 Jan '12

28 Jan '12

At the beginning of January I encountered a problem where several vm guests on a single host somehow managed to see the the virtual disks assigned to other guests on the same hosts. I was unable to resolve this situation and shutdown the affected guests after creating new guest instances and moving the services and data off the corrupted guests. I have since removed these guests via virt-manager but all attempts to remove from the host the logical volumes associated with the former VirtIO disks fail. The volumes are considered open by lvremove and nothing I have tried can get them to close for removal. The --force option has no effect on this situation. # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Can't remove open logical volume "lv_vm_base" # dmsetup info -c vg_vhost01-lv_vm_base Name Maj Min Stat Open Targ Event UUID vg_vhost01-lv_vm_base 253 5 L--w 2 1 0 LVM-gXMt00E1RDjpSX3INLZ35Prtg66aX36BeAOlKIkmfSNQRNol3Hni920R4YVaZr52 # dmsetup remove vg_vhost01-lv_vm_base device-mapper: remove ioctl failed: Device or resource busy Command failed There are several bugs filed on similar issues and udev is sometimes identified as the culprit. If I kill the udev daemon with T=`pidof -x udevd`; kill $T and rerun the lvremove -f command then I see this change in behaviour: # /sbin/lvremove -f /dev/vg_vhost01/lv_vm_base Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 not /dev/mapper/vg_vhost01-lv_vm_pgsql--dbms.harte--lyne.ca_00p2 Found duplicate PV djM23m6YebBQ2xgPh9ORMtdX2iOu9xBQ: using /dev/mapper/vg_vhost01-lv_vm_basep2 not /dev/mapper/vg_vhost01-lv_vm_pas.harte--lyne.cap2 Can't remove open logical volume "lv_vm_base" I need to get this system stable and return the lost disk space to the storage pool. Does anyone have any suggestions as to how to proceed? If I cannot solve this using the available system commands then prudence dictates that I have to re-install the server OS and rebuild all of the vm guests. As these guests have been laboriously transferred from other hosts during the past month this is a task I would rather not have to do. Any help is gratefully accepted. -- *** 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

3 2

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

1 2

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 =========================================

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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

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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

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