Discuss November 2015

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How & where to add
by Siva Prasad Nath 24 Nov '15

24 Nov '15

auto eth0 iface eth0 inet static address 192.168.50.2 netmask 255.255.255.0 -- Shiva Prasad Nath 92981134

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LVM - stripped logical volumes by default?
by Rafał Radecki 24 Nov '15

24 Nov '15

Hi All. I am currently using OpenStack Juno on CentOS 7. The problem is that by default OpenStack's Cinder service creates logical volumes of "linear" type. I would like to have them stripped over all physical disks to get better write performance. Is there a way to tell LVM to create by default stripped volumes instead of linear ones? BR, Rafal.

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Re: [CentOS] Unit networkmanager.service not loaded
by Richard 24 Nov '15

24 Nov '15

> >> On Tue, Nov 24, 2015 at 11:01 PM, Richard wrote: > Date: Tuesday, November 24, 2015 22:48:30 +0800 > From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> > To: CentOS mailing list <centos(a)centos.org>, centos-devel(a)centos.org > Subject: [CentOS] Unit networkmanager.service not loaded > > systemctl stop networkmanager returns Unit > networkmanager.service not loaded > >> >> Hint -- try the: >> >> systemctl list-units | grep ... >> >> concept that you used previously and see what output you get. >> [sub-hint -- the *nix world is case sensitive.] >> >> This is a user (understanding) issue -- why are you including the >> "-devel" list? Don't. >> >> >>> Date: Tuesday, November 24, 2015 23:19:53 +0800 >>> From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> >>> >>> I can see below in development server >>> network.service >>> loaded active exited LSB: Bring up/down >>> networking NetworkManager.service >>> loaded active running Network Manager >>> >>> But not able to see in production. >>> >>> >>> Shiva Prasad Nath Well then, you need to figure out what you did differently in setting up these two environments. This is something specific to your process and procedures (or hardware/environment). There's not much that we can help you with as you haven't provided any details. Please do not top post on this list.

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Re: [CentOS] Unit networkmanager.service not loaded
by Richard 24 Nov '15

24 Nov '15

> Date: Tuesday, November 24, 2015 22:48:30 +0800 > From: Siva Prasad Nath <shivaprasadnath21(a)gmail.com> > To: CentOS mailing list <centos(a)centos.org>, centos-devel(a)centos.org > Subject: [CentOS] Unit networkmanager.service not loaded > > systemctl stop networkmanager returns Unit networkmanager.service > not loaded Hint -- try the: systemctl list-units | grep ... concept that you used previously and see what output you get. [sub-hint -- the *nix world is case sensitive.] This is a user (understanding) issue -- why are you including the "-devel" list? Don't.

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Unit networkmanager.service not loaded
by Siva Prasad Nath 24 Nov '15

24 Nov '15

systemctl stop networkmanager returns Unit networkmanager.service not loaded

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LVM - how to change lv from linear to stripped? Is it possible?
by Rafał Radecki 24 Nov '15

24 Nov '15

Hi All. Currently I am trying to change a logical volume from linear to stripped because I would like to have a better write throughput. I would like to perform this change "live" without stopping access to this lv. I have found two interesting examples: http://community.hpe.com/t5/System-Administration/Need-to-move-the-data-fro… http://www.depesz.com/2015/10/08/converting-logical-volume-so-that-its-stri… Both say basically to: - change the lv to a mirrored one by adding a stripped copy (~second device in RAID1) - change it back to a non-mirrored one by removing the primary linear lv (~first, source device in RAID1) My os is: $ cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) $ uname -r 3.10.0-229.14.1.el7.x86_64 $ rpm -qa | grep -i lvm lvm2-libs-2.02.115-3.el7_1.1.x86_64 lvm2-2.02.115-3.el7_1.1.x86_64 And the solution proposed in above examples does not work on it. After (lv xxx is only on /dev/sdb4 before): # lvconvert --mirrors 1 --stripes 4 /dev/cinder-volumes/xxx /dev/sda4 /dev/sdc4 /dev/sdd4 /dev/sdf4 I am getting in "lvdisplay -m": --- Logical volume --- LV Path /dev/cinder-volumes/xxx LV Name xxx VG Name cinder-volumes LV UUID AKjKAo-66cv-Ygc2-4Ykq-sSJQ-RJOY-mfjoMD LV Write Access read/write LV Creation host, time test.local, 2015-10-28 17:45:28 +0100 LV Status available # open 1 LV Size 64.01 GiB Current LE 16386 Mirrored volumes 2 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:22 --- Segments --- Logical extents 0 to 16385: Type raid1 Monitoring monitored Raid Data LV 0 Logical volume xxx_rimage_0 Logical extents 0 to 16385 Raid Data LV 1 Logical volume xxx_rimage_1 Logical extents 0 to 16385 Raid Metadata LV 0 xxx_rmeta_0 Raid Metadata LV 1 xxx_rmeta_1 And in "pvdisplay -m": --- Physical volume --- PV Name /dev/sda4 VG Name cinder-volumes PV Size 2.73 TiB / not usable 4.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 715255 Free PE 287476 Allocated PE 427779 PV UUID IrkkwI-AqpP-bTll-vlPq-NDSe-rDUg-ecAnkp ... Physical extent 427776 to 427776: Logical volume /dev/cinder-volumes/xxx_rmeta_1 Logical extents 0 to 0 Physical extent 427777 to 444162: Logical volume /dev/cinder-volumes/xxx_rimage_1 Logical extents 0 to 16385 --- Physical volume --- PV Name /dev/sdb4 VG Name cinder-volumes PV Size 2.73 TiB / not usable 4.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 715255 Free PE 698868 Allocated PE 16387 PV UUID hx0a1v-M68S-aPBL-1x9r-8EiD-3cu3-GQPLRo --- Physical Segments --- Physical extent 0 to 0: Logical volume /dev/cinder-volumes/xxx_rmeta_0 Logical extents 0 to 0 Physical extent 1 to 16386: Logical volume /dev/cinder-volumes/xxx_rimage_0 Logical extents 0 to 16385 Physical extent 16387 to 715254: FREE So the migration to a RAID1 logical volume is successful but the stripping (above "lvconvert --mirrors 1 --stripes 4 /dev/cinder-volumes/xxx /dev/sda4 /dev/sdc4 /dev/sdd4 /dev/sdf4") is not taken into consideration because only /dev/sda4 and /dev/sdb4 are used for xxx logical volume afterwards. Also when I run: # lvconvert -m 0 /dev/cinder-volumes/xxx /dev/sdb4 afterwards I get xxx logical volume only on /dev/sda4 and it is linear (not stripped). Can someone help me with this? ;) BR, Rafal.

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Google Ads in rsyslog documentation files
by Peter Eckel 24 Nov '15

24 Nov '15

Hi all, I know this comes from upstream (and most likely from the rsyslog project itself), but what's your opinion about Google Ads in system documentation files? > [peckel@mucnvjmppmtr01 ~]$ cat /etc/redhat-release > Red Hat Enterprise Linux Server release 6.7 (Santiago) > [peckel@mucnvjmppmtr01 ~]$ grep google /usr/share/doc/rsyslog-5.8.10/* > /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/rsyslog_secure_tls.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_ca.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_ca.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_ca.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_ca.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_ca.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_client.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_client.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_client.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_client.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_client.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_errmsgs.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_errmsgs.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_errmsgs.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_errmsgs.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_errmsgs.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_machine.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_machine.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_machine.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_machine.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_machine.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_scenario.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_scenario.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_scenario.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_scenario.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_scenario.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_server.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_server.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_server.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_server.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_server.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_summary.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_summary.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_summary.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_summary.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_summary.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> > /usr/share/doc/rsyslog-5.8.10/tls_cert_udp_relay.html:google_ad_client = "pub-3204610807458280"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_udp_relay.html:google_ad_slot = "5958614527"; > /usr/share/doc/rsyslog-5.8.10/tls_cert_udp_relay.html:google_ad_width = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_udp_relay.html:google_ad_height = 125; > /usr/share/doc/rsyslog-5.8.10/tls_cert_udp_relay.html:src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> I find it rather disconcerting if there are commercial ads embedded in help texts I find on my open source servers. Best regards, Peter.

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Unit network.service has failed
by Siva Prasad Nath 24 Nov '15

24 Nov '15

Sorry for disturbing all of you again and again. Network service cannot be started. All the commands are not working. How to start network service?net-tool already exists. -- Shiva Prasad Nath 92981134

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Kickstarting CentOS 7 VM on CentOS 6 not possible?
by Jos Vos 24 Nov '15

24 Nov '15

Hi, On CentOS 6.7 (all updates) kickstarting a CentOS 7 VM (in the way it always has worked for other versions, incl. Fedora 22 VM's), does not work for me. I use virt-install with a local copy of the "images/pxeboot" tree. It all stops with: ... [ OK ] Reached target Paths. [ OK ] Reached target Basic System. dracut-initqueue[551]: Warning: Could not boot. dracut-initqueue[551]: Warning: /dev/root does not exist Starting Dracut Emergency Shell... Warning: /dev/root does not exist ... I found zillion references to similar problems, including PXE-related (I do not use PXE, but "-l" with virt-install) and cobbler-related (no Cobbler involved), and I tried some of the suggestions, but none of them worked. Installing CentOS 7 "manually" using virt-install and the netboot ISO works fine, but I want to use kickstart files. Thanks for any suggestion. -- -- Jos Vos <jos(a)xos.nl> -- X/OS Experts in Open Systems BV | Phone: +31 20 6938364 -- Amsterdam, The Netherlands | Fax: +31 20 6948204

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Kernel route table is empty
by Siva Prasad Nath 24 Nov '15

24 Nov '15

I can add using ifconfig and route. Then I can see kernel route entry table. I reboot system. Then route table is empty. How to make kernel route entry table permanent. -- Shiva Prasad Nath 92981134

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Discuss November 2015