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34753 discussions

Virtualization in CentOS 6
by Joseph L. Casale 15 Apr '12

15 Apr '12

I might be needing to utilize one of the provided virtualization packages either in a headless console only setup of CentOS or on my desktop. I havent used anything but ESXi in ages except virtualbox which I did not like at all. Most of the guests which I will need to run will be wnidows based and last I looked at this a few years ago, windows guests ran pathetic. What are some more current opinions on how windows guests run on the available packages compared to ESXi? The version numbers between the rhel virtio-win drivers and the publicly available ones are significantly different, and it looks like you need a rhel sub for theirs. Anyone know the state of the ones on the fedora repo? Has kvm made snapshots (without lvm) as slick as vmware yet? Thanks for the suggestions, jlc

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SSD for boot drive and OS
by Frank Cox 15 Apr '12

15 Apr '12

I just ordered a new machine that's destined to become a Centos 6 application server for a publishing company, and decided to get one with a 40GB SSD as well as a standard hard drive. I'm thinking that I can put most of the operating system on that drive and have the home directories and whatnot on the regular hard drive. Are there any pitfalls lying in wait for an unwary person like me when setting this thing up? Further, I suspect that if that thing rattles along like I think it should I'll probably want to add a SSD to my own desktop machine here. Since this computer is already set up with the default Centos 6 partitioning system on a single hard drive (/boot, /home and /) is there an easy way to transfer the OS to the SSD or would I be better off reformatting this thing and starting over from scratch if I want to have a SSD for my boot and OS drive? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com www.creekfm.com - FIFTY THOUSAND WATTS of POW WOW POWER!

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(no subject)
by dfqm2008 15 Apr '12

15 Apr '12

1 0

Changing Python Version
by Quincey Robertson 15 Apr '12

15 Apr '12

Hi; I am trying to change the default version of python on my centos 5.7 box and leave the old installation. Frustrated by not finding any help online, I went ahead and installed Python 2.6 from the source. It appears to be my default, but when I fire up mod_wsgi, it complains that it can't import os. Please advise. TIA, Quincey

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Build one VM with two 5.7 DVD iso
by Vinay Nagrik 14 Apr '12

14 Apr '12

Hello Group, I am trying to build one VMware VM for 5.7 centos. However, there are two DVDs. And all vms I have build so far are confined in one iso. How could I build complete 5.7 centos VM with two different Centos DVDs. I am sure somebody out there must have built one such OS. Please guild. thanks. nagrik

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System hanged - no info in logs.
by Rafał Radecki 14 Apr '12

14 Apr '12

Hi All. I had today a problem with my mail server (2.6.18-274.12.1.el5 #1 SMP Tue Nov 29 13:37:35 EST 2011 i686 i686 i386 GNU/Linux, CentOS release 5.7 (Final)). On my Cacti graphs I see that there has been much I/O write on the disks and then there is no more info. Also in logs (messages, dmesg, netconsole) there is no info for about 15 minutes when there was a problem with the server. I would like to have some info in such situations. Do you know any solutions? Best regards, Rafal.

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rhel/centos alternative to logwatch?
by Bob Hoffman 13 Apr '12

13 Apr '12

Logwatch file shows last upgrade to the code was 2007. The unmatched entries are killing me in the reports. I figure there must be a newer utility centos has in the repo but I cannot find one. Is logwatch the only one that is included? thanks

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FW: upgrade issue
by Paul A 13 Apr '12

13 Apr '12

Fixed the network issue by removing the net udev rule, somehow that was causing the network no to come up. Disabled iscsid since it's not needed and added did echo 0 > /proc/sys/kernel/hung_task_timeout_secs to fix the megaraid issue. -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of Paul A Sent: Friday, April 13, 2012 3:41 PM To: 'CentOS mailing list' Subject: Re: [CentOS] upgrade issue Mark, I used the centos repos, this server has centos 5.8. Iscsi will work on my previous kernel but not on the new one. I wanted to switch back to the previous kernel but for some reason the network scripts hangs even though it shows the e100 nic driver loaded. -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of m.roth(a)5-cent.us Sent: Friday, April 13, 2012 3:31 PM To: CentOS mailing list Subject: Re: [CentOS] upgrade issue Paul A wrote: > Dale, I disabled it and the server came up but im seeing all sorts of > kernel errors when its disabled ( see below ). If this can't be fixed > I would really like to boot the previous kernel however the network > script won't start. Im not really sure how upgrading the kernel caused > the network to stop working on the previous kernel. > > Apr 13 15:21:31 bakup kernel: INFO: task modprobe:740 blocked for more > than > 120 seconds. > Apr 13 15:21:31 bakup kernel: "echo 0 > > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Oh, wonderful. Didn't used to see that before the last six months. <snip> > Apr 13 15:21:31 bakup kernel: Call Trace: > Apr 13 15:21:31 bakup kernel: [<f89aa522>] megaraid_queue+0x8ce/0x8d8 > [megaraid] <snip> Interesting. Is this built-in for CentOS, or did you install megaraid from other than the CentOS repositories? mark _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

2 1

harddisk partition not created right with centos 5.7
by Vinay Nagrik 13 Apr '12

13 Apr '12

Hello Group, I am building a company application based on Centos 5.7 OS. The application was working earlier and creating right partitions both for hardware as well as VM. But since we introduced Centos 5.7 OS and start building application with 5.7 anaconda the hardware partitions are duplicate of VM partitions *while creating hardware partition my code looks like.* cat > /tmp/partmap.ks <<EOPM *clearpart --all --initlabel --drives=sda *part swap --fstype swap --asprimary --size=16000 part /boot --fstype ext3 --size=400 --asprimary --fsoptions=noatime,defaults part pv.01 --size=1 --grow volgroup jmpvgnocf pv.01 logvol / --fstype ext3 --name=lvroot --vgname=jmpvgnocf --size=1 --grow --fsoptions=noatime,defaults logvol swap --fstype swap --name=lvswap --vgname=jmpvgnocf --size=$swap_size EOPM LV Name always shows /dev/volGroup00/LogVol00. *my VM partition code looks like* cat > /tmp/partmap.ks <<EOOPM clearpart --all --initlabel #autopart changes behvior of autopart. to avoid version dependency #put specific partion configuration #autopart part /boot --fstype ext3 --size=100 part pv.2 --size=0 --grow --ondisk=sda volgroup VolGroup00 --pesize=32768 pv.2 logvol / --fstype ext3 --name=LogVol00 --vgname=VolGroup00 --size=1024 --grow logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=1000 --grow --maxsize=1984 EOOPM Could someone tell me what am I doing wrong. thanks in advance. nagrik

2 1

an assortment of mail serving issues
by Jason T. Slack-Moehrle 13 Apr '12

13 Apr '12

Hi All, I moved to a new CentOS6 install after an old CentOS5 server started exhibiting problems. I am having mail serving issues and they are confusing. I am seeing both Sendmail and Zimbra issues. We front e-end out operation with a pfSense box and it has the following mail ports open: 25, 465, 587, 110, 143, 993, 995. We have Zimbra and that also requires 7025 and 7071 be open. This sent OS Server has these same ports open and verified by 'system-config-network-tui' 1. We have a few php based sites that utilize code like: $headers = 'MIME-Version: 1.0' . "\r\n"; $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n"; $mail_to = "slackmoehrle(a)gmail.com"; $mail_subject = "[6Colors] Footage!"; $mail_body = "<html><body> "; $mail_body = $mail_body."[6Colors - FOOTAGE] "; $mail_body = $mail_body."Name: ".$vName." "; $mail_body = $mail_body."E-Mail Address: ".$vEmail." "; $mail_body = $mail_body."Comments: ".$vComment." "; $mail_body = $mail_body."------------ END ------------ "; $mail_body = $mail_body." </body></html>"; mail($mail_to, $mail_subject, $mail_body, $headers); This mail is failing to be delivered. 2. We have a database backup script that e-mails a few very small databases every night. #Enter the email address you would like to receive the backup EMAIL="slackmoehrle(a)gmail.com"; MAIL="/usr/bin/mail"; /usr/bin/uuencode $DUMP$EXT2$EXT4 $DUMP$EXT2$EXT4 |$MAIL -s "Mysql Backup For $DATABASE" $EMAIL ; This mail is failing to be delivered. 3. We have a CMS running that we have tried using SendMail and SMTP by authenticating using Google credentials, following Google instructions and the CMS cannot send outgoing mail as well. 4. Zimbra users can send mail, but replying back doesn't work. They cannot receive e-mails. I thought to check '/var/log/maillog' so I did 'tail maillog' # tail maillog Apr 12 20:43:56 www postfix/lmtp[21788]: connect to thedigiologygroup.org[75.149.56.27]:7025: Connection timed out Apr 12 20:43:56 www postfix/lmtp[21788]: 6AD69198102B: to=<jason(a)thedigiologygroup.org>, relay=none, delay=21, delays=0.07/0.01/21/0, dsn=4.4.1, status=deferred (connect to thedigiologygroup.org[75.149.56.27]:7025: Connection timed out) Apr 12 20:44:04 www postfix/smtpd[21765]: disconnect from mail-pz0-f51.google.com[209.85.210.51] Here clearly is a connection timeout on port 7025, but I do see that it is open on our pfSense box and the CentOS server experiencing this. So I started checking things like DNS, etc # host thedigiologygroup.org thedigiologygroup.org has address 75.149.56.27 thedigiologygroup.org mail is handled by 0 mail.thedigiologygroup.org. # dig +short thedigiologygroup.org mx 0 mail.thedigiologygroup.org. I had Comcast create Reverse PTR records yesterday for the IP 75.149.56.27 for mail.thedigiologygroup.org and mail.ouremail.us. I use DNSQueries to test this and I found they have a type for the mail.ouremail.us entry, they used .com, so I will call and have them correct it I tried doing an SMTP test on DNSqueries.com and it fails saying: I was NOT able to connect on port 25 to mail.thedigiologygroup.org I dont know if this is trying open relay stuff, so that should fail? I rebooted the server finally and looked at maillog after a reboot and I see: # tail /var/log/maillog Apr 12 21:14:05 www zmmailboxdmgr[5836]: status OK Apr 12 21:14:05 www zmmailboxdmgr[6021]: status requested Apr 12 21:14:05 www zmmailboxdmgr[6021]: status OK Apr 12 21:14:30 www postfix/postqueue[6243]: fatal: Queue report unavailable - mail system is down Apr 12 21:15:00 www postfix/postqueue[6251]: fatal: Queue report unavailable - mail system is down Apr 12 21:15:07 www zmmailboxdmgr[6351]: status requested Apr 12 21:15:07 www zmmailboxdmgr[6351]: status OK Apr 12 21:15:07 www zmmailboxdmgr[6360]: status requested Apr 12 21:15:07 www zmmailboxdmgr[6360]: status OK Apr 12 21:15:30 www postfix/postqueue[6559]: fatal: Queue report unavailable - mail system is down So I am really confused and I was hoping for some advice on sorting this out. -Jason

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