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Re: [CentOS] Design changes are done in Fedora
by James B. Byrne 03 Jan '15

03 Jan '15

On Wed, December 31, 2014 12:03, Warren Young wrote: > > So, cope with change. > Is one to infer from your mantra 'cope with change' that one is not supposed to express any opinion whatsoever, ever, on any forum; on the externalised cost of changes made to software with no evident technical justification? And that to do so is evidence of some moral or intellectual defect in oneself? We all cope with change until we die. That is not a philosophy or program. It is an observation on the state of existence; and is no more useful than the observation that, eventually, we all die. -- *** 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

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Sun Microsystems Quad gigabit ethernet nic compatibility
by mechy2k2000 03 Jan '15

03 Jan '15

Hello I am thinking of buying this card to and wanted to know if this NIC is supported. The card is a Sun Microsystems PCI-X Quad-Port Gigabit Ethernet Adapter QGEXPCI 501-6738-10. Can't find any info on how well the card plays with centos and also proxmox ve (if any of you use that distro ) If things don't seem to work I may bite the bullet and buy an Intel card thanks Rafeal Stewart

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Re: [CentOS] how to delete a trashed kernel
by Don Vogt 03 Jan '15

03 Jan '15

Message: 8 On Jan 1, 2015, at 3:49 PM, Don Vogt <dnvot(a)yahoo.com> wrote: > when I select the second kernel it boots OK. Now I would like to remove the bad kernel. The only thing that makes this tricky is that you can?t just say ?rpm -e kernel? because there is more than one ?kernel? package installed. You need to know the exact package name. >> I?m assuming you?re using EL7 and you told it you wanted your user to be a >> trusted admin during install. Otherwise, you might need to su up to root to do >> this. Alas, sudo is not universal: > I have never noticed a "centos-plus" in a kernel name before. Does the centos-plus repo deal out kernels? >>Clearly, the answer is ?yes?. thanks. >> I would appreciate any advice (except "go back to windows?) >You asked for it: Get and read some good books on Linux. I had some books on Unix when I started with Slackware. I downloaded it over Ftp from MIT, I believe it was Slackware 0.8. (maybe 1.0). It came on about 25 floppy disks and (with a 300baud modem) I could only do about two a night. I believe I got in trouble this time while building a centos7 partition. I had some problems getting the music to play and I went back and forth between centos6 and centos7 to see what packages I need (Centos6 was working fine). I think my initial problem was that Rpmforge doesn't have centos7. Thanks for the help. Centos6 and centos7 are now working fine (except 7 only boots about every other try- which I am still working on - I think the bios boot my Hard drives in somewhat random order and I haven't been able to come up with the proper system map -- or it may be a mixup with two SATA drives and an IDE. Pulling the power plug on the IDE drive fixes it.) I will go back to lurking.

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how to delete a trashed kernel
by Don Vogt 03 Jan '15

03 Jan '15

I have a screwed up disk arrangement, but I have had no trouble because of it after using it over a year. Recently I did a yum update. After starting the update, which included a new kernel, it seemed to either freeze or loop. It was a long time at the prompt and I got impatient and did a Ctrl C. I then tried to re-boot. The result was a kernel panic. I am keeping 5 kernels and when I select the second kernel it boots OK. Now I would like to remove the bad kernel. One other thing that I don't understand and may be relevant, the name of the bad package is kernel-2.6.32-504.3.3.el6.centos-plus.i386 I have never noticed a "centos-plus" in a kernel name before. Does the centos-plus repo deal out kernels?I have tried yum remove and "gpk application" (add and remove software) with no luck.I have tried google, but all the solutions for kernel deletions were to delete old kernels. I don't want to do that because I would be deleting my backups. I am in no hurry because I can still boot and it is possible that if I can wait through several kernel updates yum might delete the bad one after an update. I should have mentioned that I am using grub2 to boot, although I don't think that has anything to do with deleting the kernel package.I would appreciate any advice (except "go back to windows")

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ulogd / ulogd packages?
by Adam Tauno Williams 02 Jan '15

02 Jan '15

I am looking for ulog-2.0.x packages and the best I have been able to find [for CentOS6] has been ulog-2.0.0 (which is not an exciting prospect for .0 reasons). Is anyone aware of ulogd packages for CentOS6 [x86_64]? I am kind of surprised this isn't standard fair. -- Adam Tauno Williams <mailto:awilliam@whitemice.org> GPG D95ED383 Systems Administrator, Python Developer, LPI / NCLA

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Secret incantations for virt-viewer?
by Bill Gee 02 Jan '15

02 Jan '15

Hello everyone - I am trying to use virt-viewer to connect to KVM virtual machines running on a CentOS7 host. It works great when running directly on the host, but I have not been able to figure out the magic connection string to make it work from another computer. On the host, I set selinux to "permissive" and stopped the firewalld service. No change, so it is not related to them. Almost every command I try gives an immediate dialog box that says "Unable to connect to libvirt with URI ...". The only command line that gets me anything different is this: virt-viewer --connect xen+ssh://root@practice7.billgee.local/ dd2a2ba7-707d-42b5-8c83-94b11ce6e269 This will ask me for the root password on the host machine and then gives me the same "Unable to connect" message. I tried it with a regular user account instead of root and got the same result. I have tried it with and without the "root@" string. I tried using both the UUID and the domain name of the guest. I tried all of the following protocols: ssh:// qemu:// qemu:/// xen:// xen+ssh:// qemu_ssh:// qemu+ssh:// If I open a regular ssh shell using the +X parameter and then launch virt- viewer, it works. The connection string in that case is --connect=qemu:///system Any suggestions? Thanks - Bill Gee

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Happy New Year!
by Ljubomir Ljubojevic 01 Jan '15

01 Jan '15

On behalf of the CentOS project I wish you Happy New Year! Happy New Year! -- Ljubomir Ljubojevic (Love is in the Air) PL Computers Serbia, Europe StarOS, Mikrotik and CentOS/RHEL/Linux consultant

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Re: [CentOS] Design changes are done in Fedora
by Warren Young 31 Dec '14

31 Dec '14

On Dec 31, 2014, at 11:00 AM, m.roth(a)5-cent.us wrote: > Warren Young wrote: >> >> How many single computers have to be up 24/7? > > A hundred or more, here, individual servers, 24x7. I’m more interested in a percentage than absolute values. And I’m only interested in boxes that simply cannot go down for a bit of maintenance every now and then. As counterexamples, DNS, NTP, and SMTP servers are out, because these protocols were explicitly designed to cope with short temporary outages. > Home directory servers, > backup servers, compute nodes, some of which have jobs that run for days, > or a week or two, and that's not counting the clusters that do the same... > and mostly dump the data to home or project directories. That’s all possible to work around. Home servers: SAN design points the way. Backup servers: Ditto if you mean home directory mirrors. If you mean hot failover nodes in a cluster, I already pointed out that clusters let you upgrade via temporary partitioning. Compute nodes: I didn’t ask how many boxes you have that share the same 9/5/180 usage pattern of our customers. I asked how many you have that must run 24/7/365 or Bad Things happen. When a job that’s been running for 2 weeks finishes, there’s your maintenance window. Take it if you need it, let it go if you don’t.

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X11 console
by Andreas Benzler 31 Dec '14

31 Dec '14

Hello Guys… I need to revert the X11 graphical server to Console 7. and enable VT1 as normal text as it was on the old distr.. Sincerely AndyBe

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CentOS 6.6 - net-snmp process - Too many open files
by Laurent Dumont 31 Dec '14

31 Dec '14

Hi gents, I have a CentOS 6.6 install with net-snmp running. I'm using SNMPv3 Auth and Encryption with Observium polling devices every five minutes. On one of my Centos server, the net-snmp process will die after 24-36 hours of running. It seems to be hitting my system maximum file open limit which is set to 1024. > [root@mail net-snmp-5.7]# ulimit -n > 1024 That number will keep increasing till it trips the 1024 limit. > [root@mail ~]# lsof -p 26907 | wc -l > 1071 > [root@mail net-snmp-5.7]# lsof -p 26907 > snmpd 26907 root 166r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 167r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 168r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 169r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 170r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 171r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 172r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 173r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 174r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 175r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 176r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 177r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 178r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > snmpd 26907 root 179r REG 0,3 0 4026532160 > /proc/26907/net/sctp/snmp > #tail /var/log/snmpd.log > cannot open /proc/net/dev ... > /proc/partitions: Too many open files > /proc/stat: Too many open files > /proc/partitions: Too many open files > /proc/stat: Too many open files > could not create socket > /proc/partitions: Too many open files > /proc/stat: Too many open files > cannot open /proc/net/dev ... > /proc/partitions: Too many open files > /proc/stat: Too many open files > /proc/partitions: Too many open files > /proc/stat: Too many open files It seems that CentOS is frozen to net-snmp 5.5 and I'm don't really want to use anything that I can't easily manage with "yum". The weird thing is that I have another server with the same config/CentOS version/Net-Snmp version and I have no issues with the snmp process on that server. I could raise the open file limit but that just seems unnecessary since I don't think that snmp is supposed to work that way. Anything else I could try to troubleshoot the issue? Thanks!

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