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Centos 8 server rebooting...
by Tom Bishop 13 Nov '19

13 Nov '19

Can someone provide some guidance with my server, I have a fairly new centos 8 server, pretty much just a KVM host but I have noticed that its dumping and rebooting at various times. Journalctl does not go back past the reboot so I am unable to catch what may be causing it, it appears to be KVM from /var/log/messages and it appears I should have a kernel dump file but I am unable to find it. I had these same kvm images running on the centos 7 server for over a year at a time, not sure what is making things less stable. Any help would be appreciated, thanks. Here is the output from /var/log/messages: Nov 12 16:28:53 f15ex kernel: traps: CPU 1/KVM[4080] general protection ip:55fa8cac0280 sp:7f71cc9c3398 error:0 in qemu-kvm[55fa8c662000+9b0000] Nov 12 16:28:54 f15ex systemd[1]: Created slice system-systemd\x2dcoredump.slice. Nov 12 16:28:54 f15ex systemd[1]: Started Process Core Dump (PID 23836/UID 0). Nov 12 16:28:54 f15ex systemd-coredump[23837]: Resource limits disable core dumping for process 4027 (qemu-kvm). Nov 12 16:28:54 f15ex systemd-coredump[23837]: Process 4027 (qemu-kvm) of user 107 dumped core. Nov 12 16:28:54 f15ex libvirtd[1205]: 2019-11-12 22:28:54.118+0000: 1205: info : libvirt version: 4.5.0, package: 24.3.module_el8.0.0+189+f9babebb (CentOS Bu ildsys <bugs(a)centos.org>, 2019-10-08-21:54:46, ) Nov 12 16:28:54 f15ex libvirtd[1205]: 2019-11-12 22:28:54.118+0000: 1205: info : hostname: f15ex Nov 12 16:28:54 f15ex libvirtd[1205]: 2019-11-12 22:28:54.118+0000: 1205: error : qemuMonitorIO:718 : internal error: End of file from qemu monitor Nov 12 16:28:54 f15ex avahi-daemon[1064]: Interface vnet2.IPv6 no longer relevant for mDNS. Nov 12 16:28:54 f15ex kernel: br99: port 3(vnet2) entered disabled state Nov 12 16:28:54 f15ex avahi-daemon[1064]: Leaving mDNS multicast group on interface vnet2.IPv6 with address fe80::fc54:ff:fe60:c47d. Nov 12 16:28:54 f15ex kernel: device vnet2 left promiscuous mode Nov 12 16:28:54 f15ex kernel: br99: port 3(vnet2) entered disabled state Nov 12 16:28:54 f15ex avahi-daemon[1064]: Withdrawing address record for fe80::fc54:ff:fe60:c47d on vnet2. Nov 12 16:28:54 f15ex NetworkManager[1186]: <info> [1573597734.1428] device (vnet2): state change: activated -> unmanaged (reason 'unmanaged', sys-iface-sta te: 'removed') Nov 12 16:28:54 f15ex NetworkManager[1186]: <info> [1573597734.1431] device (br99): bridge port vnet2 was detached Nov 12 16:28:54 f15ex NetworkManager[1186]: <info> [1573597734.1431] device (vnet2): released from master device br99 Nov 12 16:28:54 f15ex dbus-daemon[1057]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatch er.service' requested by ':1.13' (uid=0 pid=1186 comm="/usr/sbin/NetworkManager --no-daemon " label="system_u:system_r:NetworkManager_t:s0") Nov 12 16:28:54 f15ex systemd[1]: Starting Network Manager Script Dispatcher Service... Nov 12 16:28:54 f15ex dbus-daemon[1057]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' Nov 12 16:28:54 f15ex systemd[1]: Started Network Manager Script Dispatcher Service. Nov 12 16:28:54 f15ex nm-dispatcher[23857]: req:1 'down' [vnet2]: new request (3 scripts) Nov 12 16:28:54 f15ex nm-dispatcher[23857]: req:1 'down' [vnet2]: start running ordered scripts... Nov 12 16:28:54 f15ex kvm[23865]: 2 guests now active Nov 12 16:28:54 f15ex systemd-machined[1061]: Machine qemu-3-OMV terminated. Nov 12 16:28:54 f15ex kernel: Warning: mpt3sas 0000:0a:00.0 [1000:0072] - Support for this device has been removed in this major release. Please check the re moved functionality section of the release notes.

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cli Checking disk i/o
by Robert Moskowitz 12 Nov '19

12 Nov '19

I just built a CentOS7 system on a Zotac NANO PC. I used a 320GB 2.5" HD I had sitting around and installed with Standard Partitions on XFS. The drive is spinning, nonstop. How can I monitor if there is actually disk i/o to warrant this constant spinning. So noatime for all partitions work with XFS? I did some browsing and the claim is XFS uses realtime which is better? than noatime? Perhaps it is just occasional writes to messages (at least 1 a minute) that determines to keep on spinning. But it is annoying.

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Mod_evasive for HTTPD24 (Software collections)
by Akshar Kanak 11 Nov '19

11 Nov '19

Hi Team I am planning to use mod_evasive to prevent dos attackS . I am using httpd24-httpd-2.4.34-7.el6.x86_64 (httpd software collections) on Centos 6.5 . Do we have mod_evasive rpm wrt to this httpd version ? Thanks and regards AKshar

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samab touch file on share no permisson allthough file is written
by Ralf Prengel 11 Nov '19

11 Nov '19

Hallo, I ve a samba problem. I m using a samba server on centos 7. The share ist mounted by windows 7 and a centos client. Everything is working but touch filename on the share shows the message "no permission" allthough the file is written. Has anyone a hint for me? Ralf

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Re: [CentOS] cli Checking disk i/o
by Robert Moskowitz 11 Nov '19

11 Nov '19

OK. That is interesting. I am assuming tps is transfers per sec? I would have to get a stop watch, but it seems to go a bit of time, and then a write. Is there something that would accumulate this and give me a summary over some period of time? Of course it better NOT be doing its own IOs... On 11/10/19 6:03 PM, shimi wrote: > iostat 1 > > On Mon, 11 Nov 2019, 00:11 Robert Moskowitz, <rgm(a)htt-consult.com > <mailto:rgm@htt-consult.com>> wrote: > > I just built a CentOS7 system on a Zotac NANO PC. > > I used a 320GB 2.5" HD I had sitting around and installed with > Standard > Partitions on XFS. > > The drive is spinning, nonstop. > > How can I monitor if there is actually disk i/o to warrant this > constant > spinning. > > So noatime for all partitions work with XFS? I did some browsing and > the claim is XFS uses realtime which is better? than noatime? > > Perhaps it is just occasional writes to messages (at least 1 a > minute) > that determines to keep on spinning. > > But it is annoying. > > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org <mailto:CentOS@centos.org> > https://lists.centos.org/mailman/listinfo/centos >

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Intel Wireless 3160 adapter misbehaving
by Patrick DERWAEL 10 Nov '19

10 Nov '19

Hi folks I'm having some hard time troubleshooting a Wifi issue Centos7, fully up to date, with an Intel Dual Band 3160 Wireless adapter After the machine boots, the Wifi connects and runs ok for a few hours After this, the Wifi just stops [root@orbex ~]# lspci -v | grep Wireless 04:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83) Subsystem: Intel Corporation Dual Band Wireless AC 3160 [root@orbex ~]# grep iwlwifi messages Nov 10 03:44:02 orbex kernel: iwlwifi 0000:04:00.0: Error sending SCAN_OFFLOAD_REQUEST_CMD: enqueue_hcmd failed: -5 Nov 10 03:44:02 orbex kernel: iwlwifi 0000:04:00.0: Scan failed! ret -5 Nov 10 03:44:02 orbex kernel: iwlwifi 0000:04:00.0: Failed to wake NIC for hcmd 100s of similar lines Nov 10 14:55:01 orbex kernel: iwlwifi 0000:04:00.0: Failed to wake NIC for hcmd Nov 10 14:55:01 orbex kernel: iwlwifi 0000:04:00.0: Error sending SCAN_OFFLOAD_REQUEST_CMD: enqueue_hcmd failed: -5 Nov 10 14:55:01 orbex kernel: iwlwifi 0000:04:00.0: Scan failed! ret -5 Nov 10 14:56:37 orbex kernel: iwlwifi 0000:04:00.0: loaded firmware version 17.3216344376.0 op_mode iwlmvm Nov 10 14:56:37 orbex kernel: iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 3160, REV=0x164 Nov 10 14:56:37 orbex kernel: iwlwifi 0000:04:00.0: base HW address: 34:de:1a:f0:c2:fb Nov 10 14:56:38 orbex NetworkManager[1154]: <info> [1573394198.8523] rfkill1: found Wi-Fi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0/ieee80211/phy0/rfkill1) (driver iwlwifi) [root@orbex log]# Any advice? Thanks! -- Patrick Derwael Rue de la fontaine, 3 4210 Burdinne Tél:+32.(0)479.80.50.79

1 0

Need help modding src.rpms to generate complete SAMBA AD DC binary RPMs for CentOS 8
by Robert G (Doc) Savage 10 Nov '19

10 Nov '19

When RHEL8 and CentOS8 were released, I was looking forward to setting up SAMBA as a AD DC server for CentOS8. But when I lifed the hood on the samba.spec file I found the option to build the samba-dc binary rpm has been disabled for rhel family builds. Apparently Red Hat does not want to support a unified SAMBA AD DC environment. I believe we have all of the componentns needed to set up a fully up-to-date samba-dc binary. But it's been decades since I last rolled up my sleeves with my hardbound copy of "Maximum RPM" and built custom binary rpms. Has anyone already done this as a COPR or similar project? Failing that, I'm willing to work with anyone with more up-to-date rpmbuild tools to create and document the process. --Doc Savage Fairview Heights, IL

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named errors in /var/log/messages
by Walter H. 09 Nov '19

09 Nov '19

Hello, can someone explain these errors Oct 27 15:34:05 vhost01 named[1316]: zone #ZONE#/IN/auth: refresh: retry limit for master IPV6-MASTER#53 exceeded (source IPV6-THIS#0) Oct 27 15:34:05 vhost01 named[1316]: zone #ZONE#/IN/auth: Transfer started. Oct 27 15:34:06 vhost01 named[1316]: zone #ZONE#/IN/auth: refresh: retry limit for master IPV6-MASTER#53 exceeded (source IPV6-THIS#0) Oct 27 15:34:06 vhost01 named[1316]: zone #ZONE#/IN/auth: Transfer started. Oct 29 04:06:19 vhost01 named[1316]: zone #ZONE#/IN/auth: refresh: retry limit for master IPV6-MASTER#53 exceeded (source IPV6-THIS#0) Oct 29 04:06:19 vhost01 named[1316]: zone #ZONE#/IN/auth: Transfer started. is this caused by a misconfiguration at the master dns or this dns (slave)? (the master dns can only be connected by IPv6) is there a serious problem? there also can be found such entries Oct 29 04:06:21 vhost01 named[1316]: transfer of '#ZONE#/IN/auth' from IPV6-MASTER#53: connected using IPV6-THIS#46019 Oct 29 04:06:21 vhost01 named[1316]: transfer of '#ZONE#/IN/auth' from IPV6-MASTER#53: Transfer completed: 0 messages, 1 records, 0 bytes, 0.064 secs (0 bytes/sec) or is this just caused by #0 - I guess source port 0? these are the ip6tables entries on this dns (slave) -A INPUT -i eth0 -d IPV6-THIS -m tcp -p tcp --dport 53 -m state --state NEW -j ACCEPT -A INPUT -i eth0 -d IPV6-THIS -m udp -p udp --dport 53 -j ACCEPT the master has these for each dns -A INPUT -i sit1 -s IPV6-SLAVE -d IPV6-MASTER -m tcp -p tcp --dport 53 -m state --state NEW -j ACCEPT -A INPUT -i sit1 -s IPV6-SLAVE -d IPV6-MASTER -m udp -p udp --dport 53 -j ACCEPT the master DNS has this in /etc/named.conf acl dns-hosts { IPV6-SLAVE; // IPv6only: slave ... }; view "auth" { match-clients { dns-hosts; }; empty-zones-enable no; recursion no; additional-from-auth no; additional-from-cache no; also-notify { IPV6-SLAVE; // IPv6only: slave ... }; notify-source 0.0.0.0; notify-source-v6 IPV6-MASTER; transfer-source 0.0.0.0; transfer-source-v6 IPV6-MASTER; zone "#ZONE#" IN { type master; notify yes; file "named._authzone-#ZONE#"; allow-transfer { dns-hosts; }; allow-update { none; }; }; ... }; the slaves itself have this in /etc/named.conf masters masterhost { IPV6-MASTER; // IPv6only: master }; view "auth" { match-clients { any; }; empty-zones-enable no; recursion no; transfer-source 0.0.0.0; transfer-source-v6 IPV6-SLAVE; additional-from-auth no; additional-from-cache no; zone "#ZONE#" IN { type slave; masters { masterhost; }; file "slaves/named._authzone-#ZONE#"; }; ... }; I have 3 slave DNS servers, each has the same master; and such log entries are at all three slave DNS servers; each of these 3 slaves is DualStack (in the wild) and the master is IPv6only (at home) Thanks, Walter

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yum install fails - itertoolsmodule.so
by Gary Stainburn 08 Nov '19

08 Nov '19

I've just tried a yum update on one of my C7 boxes and got the following output. I'm guessing to fix this I need to re-install the RPM, but I can't remove it because of dependancies, so how can I fix the problem? I've managed to download a later version of the RPM, but haven't managed to find the same version as the one installed. Gary [root@zeppo ~]# yum install There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: /usr/lib64/python2.7/lib-dynload/itertoolsmodule.so: cannot read file data: Input/output error Please install a package which provides this module, or verify that the module is installed correctly. It's possible that the above module doesn't match the current version of Python, which is: 2.7.5 (default, Sep 15 2016, 22:37:39) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] If you cannot solve this problem yourself, please go to the yum faq at: http://yum.baseurl.org/wiki/Faq [root@zeppo ~]# rpm -qf /usr/lib64/python2.7/lib-dynload/itertoolsmodule.so python-libs-2.7.5-39.el7_2.x86_64 [root@zeppo ~]# [root@zeppo ~]# rpm -e python-libs-2.7.5-39.el7_2.x86_64 error: Failed dependencies: libpython2.7.so.1.0()(64bit) is needed by (installed) python-lxml-3.2.1-4.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) yum-metadata-parser-1.1.4-10.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) pyliblzma-0.5.3-11.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) pyxattr-0.5.1-5.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) cmpi-bindings-pywbem-0.9.5-6.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-kmod-0.9-4.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) newt-python-0.52.15-4.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-setproctitle-1.1.6-5.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-ethtool-0.8-5.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-urwid-1.1.1-3.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-pycurl-7.19.0-17.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) PyYAML-3.10-11.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) pygpgme-0.3-9.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-cups-1.9.63-6.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-2.7.5-39.el7_2.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) libxml2-python-2.9.1-6.el7_2.3.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) gdb-7.6.1-80.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-dmidecode-3.10.13-11.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-perf-3.10.0-327.36.3.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) cryptsetup-python-1.6.7-1.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) pyparted-1:3.9-13.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) rpm-python-4.11.3-17.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) iscsi-initiator-utils-6.2.0.873-33.el7_2.2.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-pcp-3.10.6-2.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) lvm2-python-libs-7:2.02.130-5.el7_2.5.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) perf-3.10.0-327.36.3.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) m2crypto-0.21.1-17.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) python-pillow-2.0.0-19.gitd1c6db8.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) bacula-libs-5.2.13-23.1.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) bacula-storage-5.2.13-23.1.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) bacula-client-5.2.13-23.1.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) gnome-python2-canvas-2.28.1-14.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) gnome-python2-bonobo-2.28.1-14.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) gnome-python2-gnomevfs-2.28.1-14.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) gnome-python2-gnome-2.28.1-14.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) pytalloc-2.1.6-1.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) samba-libs-0:4.4.4-9.el7.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) policycoreutils-python-2.5-11.el7_3.x86_64 libpython2.7.so.1.0()(64bit) is needed by (installed) systemd-python-219-30.el7_3.8.x86_64 python-libs(x86-64) = 2.7.5-39.el7_2 is needed by (installed) python-2.7.5-39.el7_2.x86_64 [root@zeppo ~]#

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C8: Wayland Session / Cut and Paste
by Leon Fauster 08 Nov '19

08 Nov '19

Is this the normal behavior now? Cutting text in gedit and pasting it into the terminal needs that the source application stays running? -- Leon

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