Discuss September 2017

discuss@lists.centos.org

128 participants
125 discussions

Xen PV DomU's and the 3.10.0-693.el7 Kernel
by Johnny Hughes 12 Sep '17

12 Sep '17

If you are running CentOS Linux 7 inside a Xen DomU (VM) in PV mode, you can not upgrade to the standard 7.4.1708 kernel that is currently in the CR repo and that will be soon released in our file 7.4.1708 tree (3.10.0-693.*el7) The CentOS Plus kernel will be available when we release the 7.4.1708 tree and it does boot inside a Xen DomU PV, so you can either upgrade to the CentOS Plus kernel in PV mode .. or you can shift your DomU to either HVM or PVHVM modes. PVHVM is more like PV mode, and is usually much better than HVM mode. More info on PVHVM here: https://wiki.xen.org/wiki/PV_on_HVM https://wiki.xen.org/wiki/Xen_Linux_PV_on_HVM_drivers The anaconda installer and pxe booting from the standard tree 7.4.1708 tree will also not work in PV mode for new installs, only PVHVM or HVM installs can be done with the 7.4.1708 tree. Note: This is an upstream source code issue and will not be fixed in the main CentOS Linux 7 kernel unless it is fixed upstream in the RHEL source code. We are sorry for any inconvenience this issue may cause. Thanks, Johnny Hughes

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bind named fails after logrotate
by Götz Reinicke 12 Sep '17

12 Sep '17

Hi, on our centos 7.3.1611 server the named dies after the log rotates script is executed. systemctl status named ● named.service - Berkeley Internet Name Domain (DNS) Loaded: loaded (/usr/lib/systemd/system/named.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Di 2017-09-12 14:27:57 CEST; 2s ago Process: 20714 ExecStop=/bin/sh -c /usr/sbin/rndc stop > /dev/null 2>&1 || /bin/kill -TERM $MAINPID (code=exited, status=1/FAILURE) Process: 20684 ExecReload=/bin/sh -c /usr/sbin/rndc reload > /dev/null 2>&1 || /bin/kill -HUP $MAINPID (code=exited, status=0/SUCCESS) Main PID: 14496 (code=killed, signal=ABRT) Any suggestions or hints or is that a known problem? logrotate-3.8.6 bind-9.9.4 Thanks and regards . Götz

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Missing CentOS 7 Updates
by Ken Gramm 12 Sep '17

12 Sep '17

I must be missing something, because I can't believe that there haven't been any updates since July 27 9fa12aadcd2ea45fdcb91bd125b619545993defa2032cf99b8a89cf6099723e8-primary.xml.gz 27-Jul-2017 15:12 4.0M [ ] 23b0e14a9667597b69a8719f0eea709721cc32f9f3b6c8202da0f5a36b9f1759-other.xml.gz 27-Jul-2017 15:12 137M [ ] 33fdce604445f67a26ce5ddc354ea0c835ed119ac8cb7404cc2b565bf80722a1-primary.sqlite.bz2 27-Jul-2017 15:16 7.8M [ ] 732f62a4c48e764e2ebe276eef7e6bf25eaf477452260a03805512a6a7a6ce80-filelists.sqlite.bz2 27-Jul-2017 15:16 4.4M [ ] 36288cdc93433b594aed022edabca28fe92c3497e23da598c59f890c0ddd7255-other.sqlite.bz2 27-Jul-2017 15:16 93M [ ] a6fd2af929647636c10531913d7c0b3a4277732a694d9aff9093dbb7890c4094-prestodelta.xml.gz 27-Jul-2017 15:14 954K [ ] bab46e0e0fd6233a1d50ad0cebcc6bae42c43fb85bf143f6ec415fd3458e882d-filelists.xml.gz 27-Jul-2017 15:12 4.8M [TXT] repomd.xml 27-Jul-2017 15:16 3.4K [TXT] repomd.xml.asc 27-Jul-2017 15:21 811

3 4

Corosync on a home network
by J Martin Rushton 12 Sep '17

12 Sep '17

I've been trying to build a model cluster using three virtual machines on my home server. Each VM boots off its own dedicated partition (CentOS 7.3). One partition is designated to be the common /home partition for the VMs, (on the real machine it will mount as /cluster). I'm intending to run GFS2 on the shared partition, so I need to configure DLM and corosync. That's where I'm getting bogged down. The VMs and the real machine are bridged onto one ethernet. There is another ethernet in the main machine on a different network, but that is not used for clustering. The ethernet port is connected to a switch which in turn connects to a BT Home Hub 6. All four adresses are static, Network Manager is off, ssh works across the nodes without a password and ping gives sensible times. --------------%<------------------- # brctl show bridge name bridge id STP enabled interfaces br3 XXXXXXXXX no enp3s0 vnet0 vnet1 vnet2 virbr0 XXXXXXXXX yes virbr0-nic --------------%<------------------- When I start corosync each node starts up but does not see the others. For instance I see: --------------%<---------------------- # corosync-quorumtool Quorum information ------------------ Date: Sun Sep 10 12:56:56 2017 Quorum provider: corosync_votequorum Nodes: 1 Node ID: 3 Ring ID: 3/28648 Quorate: No Votequorum information ---------------------- Expected votes: 4 Highest expected: 4 Total votes: 1 Quorum: 3 Activity blocked Flags: Membership information ---------------------- Nodeid Votes Name 3 1 192.168.1.52 (local) ----------------%<------------------- All four nodes are similar, but with different node IDs, IP addresses and Ring IDs. The documentation warns that not all routers will handle multicast datagrams correctly. I therefore attempted to force unicast communication by making the following changes from the distributed corosync.conf: transport: updu cluster_name: <set to the same as the domain> # crypto_cipher: none # crypto_hash: none # mcastaddr: 239.255.1.1 # mcastport: 5405 # ttl: 1 The following are unchanged: version: 2 secauth: off ringnumber: 0 bindnetaddr: 192.168.1.0 The nodelist is: ---------%<---------------- nodelist { node { ring0_addr: 192.168.1.2 nodeid: 1 } node { ring0_addr: 192.168.1.51 nodeid: 2 } node { ring0_addr: 192.168.1.52 nodeid: 3 } node { ring0_addr: 192.168.1.53 nodeid: 4 } } --------%<------------------ logging and quorum are as supplied. Any help will be gratefully received. Regards, Martin

4 5

Kernel Updates
by Michael Rapuano 12 Sep '17

12 Sep '17

We are running kernel-3.10.0-514.26.2.el7 and need to update to kernel-3.10.0-693.el7. The new kernel is in the CR repo but not in the base/update repos. When will the updates in the CR repo be in the base/update repos? This is a high priority security issue for us. -- Michael Rapuano michael.rapuano(a)cloudlock.com

3 2

centos-7.4 elfutils
by Jack Bailey 11 Sep '17

11 Sep '17

Hello, I'm taking 7.4 for a spin. I did the minimal install, and ran into trouble with groupinstall base. The trouble seems to stem from elfutils. One command claims elfutils-libs-0.166-2.el7.x86_64 is missing, and another one claims it's installed. Not sure what's going on here. [root@ip-172-31-34-187 ~]# yum -y install elfutils.x86_64 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.web-ster.com * extras: mirror.chpc.utah.edu * updates: mirrors.cat.pdx.edu Resolving Dependencies --> Running transaction check ---> Package elfutils.x86_64 0:0.166-2.el7 will be installed --> Processing Dependency: elfutils-libs(x86-64) = 0.166-2.el7 for package: elfutils-0.166-2.el7.x86_64 --> Processing Dependency: elfutils-libelf(x86-64) = 0.166-2.el7 for package: elfutils-0.166-2.el7.x86_64 --> Finished Dependency Resolution Error: Package: elfutils-0.166-2.el7.x86_64 (base) Requires: elfutils-libelf(x86-64) = 0.166-2.el7 Installed: elfutils-libelf-0.168-8.el7.x86_64 (@anaconda) elfutils-libelf(x86-64) = 0.168-8.el7 Available: elfutils-libelf-0.166-2.el7.x86_64 (base) elfutils-libelf(x86-64) = 0.166-2.el7 Error: Package: elfutils-0.166-2.el7.x86_64 (base) Requires: elfutils-libs(x86-64) = 0.166-2.el7 Installed: elfutils-libs-0.168-8.el7.x86_64 (@anaconda) elfutils-libs(x86-64) = 0.168-8.el7 Available: elfutils-libs-0.166-2.el7.x86_64 (base) elfutils-libs(x86-64) = 0.166-2.el7 You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest [root@ip-172-31-34-187 ~]# yum -y install elfutils-libs.x86_64 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.web-ster.com * extras: mirror.chpc.utah.edu * updates: mirrors.cat.pdx.edu Package matching elfutils-libs-0.166-2.el7.x86_64 already installed. Checking for update. Nothing to do

3 3

SNMP V3 libraries not found, SNMPV3 disabled.
by Alex Tang 11 Sep '17

11 Sep '17

Dear all, I have installed mrtg via yum on centos 7, and using cron job to load mrtg every 5 mins. Everything work fine but just snmp v3 graph no show up. I try to load the command LAND=C /usr/bin/mrtg /etc/mrtg/metg.cfg it will show an error "SNMP V3 libraries not found, SNMPV3 disabled.". so, i installed all the net-snmp but still showing the error. I can't find any suggestion on google. can anyone have the same problem ? Thanks Alex

1 0

systemctl poweroff
by Nicolas Kovacs 11 Sep '17

11 Sep '17

Hi, I've been using CentOS since versions 4.x, and I see a weird trend in recent Linux distributions. Under CentOS 4.x, 5.x and 6.x, shutting down a server (workstation, laptop) simply meant issuing 'shutdown -h now' (or choosing 'Shutdown' from the GUI menu), and the machine would simply shut down. Whatever crazy process went haywire, shutting down the system meant exactly that. No questions asked. Now with CentOS 7.x, sometimes the machine would simply hang during the shutdown process, or I would get a message like "a stop job is running", and I would end up having to hit the Reset button to stop the system, as I did when I used Microsoft Windows (before 2001). Cheers, Niki Kovacs -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

2 1

Flush memory on a server?
by Nicolas Kovacs 11 Sep '17

11 Sep '17

Hi, A few days ago I checked the health of my main public server running CentOS 7, a quad-core machine with 16 GB RAM. It had been running non-stop for 65 days, hosting only a handful of services (BIND, NTP, Apache, Postfix, Dovecot) for two domains. I was surprised to see that RAM consumption was relatively high, and apparently, the machine even had to swap at some time. I read up a bit on RAM consumption, and now I wonder if flushing the memory cache regularly is a good idea. https://tecadmin.net/flush-memory-cache-on-linux-server/ Any suggestions? Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

6 9

CentOS 7 on PPC64le booting from a MD RAID volume
by Tom Leach 09 Sep '17

09 Sep '17

I've been trying to install CentOS 7 AltArch ppc64le onto a new Power 8 system and I want to configure mdraid for the volumes. I can get everything working if I install to a single disk, but when I configure for RAID 1, the system fails to boot. So, is mdraid1 supported for booting a Power 8 system? Tom Leach leach(a)coas.oregonstate.edu

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Discuss September 2017