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multipath
by Tony Schreiner 03 Oct '17

03 Oct '17

I have inherited a system set up with multipath, which is not something I have seen before so I could use some advice The system is a Dell R420 with 2 LSI SAS2008 HBAs, 4 internal disks, and a MD3200 storage array attached via SAS cables. Oh and CentOS 6 lsblk shows the following: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdd 8:48 0 931.5G 0 disk ├─sdd1 8:49 0 931.5G 0 part └─mpathi (dm-0) 253:0 0 931.5G 0 mpath sdc 8:32 0 931.5G 0 disk ├─sdc1 8:33 0 1000M 0 part /boot ├─sdc2 8:34 0 31.3G 0 part / ├─sdc3 8:35 0 31.3G 0 part [SWAP] ├─sdc4 8:36 0 1K 0 part ├─sdc5 8:37 0 184.5G 0 part /home └─sdc6 8:38 0 683.6G 0 part /data01 sde 8:64 0 931.5G 0 disk ├─sde1 8:65 0 931.5G 0 part └─mpathj (dm-1) 253:1 0 931.5G 0 mpath └─mpathjp1 (dm-8) 253:8 0 931.5G 0 part /data02 sdf 8:80 0 931.5G 0 disk ├─sdf1 8:81 0 931.5G 0 part └─mpathk (dm-2) 253:2 0 931.5G 0 mpath sda 8:0 0 51T 0 disk ├─sda1 8:1 0 12.8T 0 part ├─sda2 8:2 0 12.8T 0 part ├─sda3 8:3 0 12.8T 0 part ├─sda4 8:4 0 12.8T 0 part └─mpathe (dm-3) 253:3 0 51T 0 mpath ├─mpathep1 (dm-4) 253:4 0 12.8T 0 part /SAN101 ├─mpathep2 (dm-5) 253:5 0 12.8T 0 part /SAN102 ├─mpathep3 (dm-6) 253:6 0 12.8T 0 part /SAN103 └─mpathep4 (dm-7) 253:7 0 12.8T 0 part /SAN104 sdb 8:16 0 51T 0 disk ├─sdb1 8:17 0 12.8T 0 part ├─sdb2 8:18 0 12.8T 0 part ├─sdb3 8:19 0 12.8T 0 part ├─sdb4 8:20 0 12.8T 0 part └─mpathe (dm-3) 253:3 0 51T 0 mpath ├─mpathep1 (dm-4) 253:4 0 12.8T 0 part /SAN101 ├─mpathep2 (dm-5) 253:5 0 12.8T 0 part /SAN102 ├─mpathep3 (dm-6) 253:6 0 12.8T 0 part /SAN103 └─mpathep4 (dm-7) 253:7 0 12.8T 0 part /SAN104 sda and sdb are two views of the unit on the MD, sdc is the boot and root disk, one of the disks sde (mpathj) has a mounted file system, the remaining two do not. here is df: Filesystem Type Size Used Avail Use% Mounted on /dev/sdc2 ext4 31G 26G 4.0G 87% / tmpfs tmpfs 16G 92K 16G 1% /dev/shm /dev/sdc1 ext4 969M 127M 793M 14% /boot /dev/sdc6 ext4 673G 242G 398G 38% /data01 /dev/mapper/mpathjp1 ext4 917G 196G 676G 23% /data02 /dev/sdc5 ext4 182G 169G 3.9G 98% /home /dev/mapper/mpathep1 ext4 13T 11T 1005G 92% /SAN101 /dev/mapper/mpathep2 ext4 13T 5.0T 7.0T 42% /SAN102 /dev/mapper/mpathep3 ext4 13T 4.9T 7.1T 42% /SAN103 /dev/mapper/mpathep4 ext4 13T 8.2T 3.8T 69% /SAN104 So a few questions: Is there any value in using multipath on the 4 internal drives; do they actually have multiple data paths? Why does multipath not create a mpath device for the system disk sdc, there is no blacklist in the mulitpath.conf file. If I do a dry-run mulitpath -d command, it sets up mpathh on sdc, but apparently not on boot. Why not? I should say that the system has not been rebooted since well before I took it over, it has been up for over 400 days. the sdd and sdf disks have a single partition, but apparently no mpath device for the partition, how to I create one? Thanks in advance

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Yum java-devel not listed installed
by david 03 Oct '17

03 Oct '17

Folks I performed an install of "java-devel". Several packages got installed. So far so good. Yet, when I performed yum list installed | grep java-devel and also yum rpm -qa | grep java-devel it did not show up as already installed. This behavior appears both on Centos7 and Centos6. This bothers me because as a time-saving effort, I maintain the last output of "yum list installed" and quickly determine whether it's worth running yum. True, yum would "do nothing", but that takes several seconds. Is there some simple explanation? It works for all the other packages I've installed. David

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CentOS-announce Digest, Vol 152, Issue 1
by centos-announce-request＠centos.org 03 Oct '17

03 Oct '17

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2017:2838 Critical CentOS 6 dnsmasq Security Update (Johnny Hughes) 2. CESA-2017:2836 Critical CentOS 7 dnsmasq Security Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Mon, 2 Oct 2017 23:34:13 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CESA-2017:2838 Critical CentOS 6 dnsmasq Security Update Message-ID: <20171002233413.GA8456(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2017:2838 Critical Upstream details at : https://access.redhat.com/errata/RHSA-2017:2838 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 973d0342cc189e8a76a86645b13dddf1582019cb96446f85b68611d8b69249c3 dnsmasq-2.48-18.el6_9.i686.rpm d97113cf1641a9c46aedd5c4b0d1091ae07ac179e3261334d4bd256186bfbd34 dnsmasq-utils-2.48-18.el6_9.i686.rpm x86_64: 15647fdea6bbf90bce5b5127dc2da0a0d0b338381dbb73fd1193b7f061986e97 dnsmasq-2.48-18.el6_9.x86_64.rpm 5e62a539a1ab5635ef908109dddb971f68cf476d0efe0475928274f16f207df7 dnsmasq-utils-2.48-18.el6_9.x86_64.rpm Source: ddc31b1822ac164af8bdc2f4947f2a760644b1e6c797e6403ef381949ae68109 dnsmasq-2.48-18.el6_9.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net Twitter: @JohnnyCentOS ------------------------------ Message: 2 Date: Tue, 3 Oct 2017 00:04:45 +0000 From: Johnny Hughes <johnny(a)centos.org> To: centos-announce(a)centos.org Subject: [CentOS-announce] CESA-2017:2836 Critical CentOS 7 dnsmasq Security Update Message-ID: <20171003000445.GA16557(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2017:2836 Critical Upstream details at : https://access.redhat.com/errata/RHSA-2017:2836 The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) x86_64: 4116649e1e436cbc3a5cb3f63fab5b4ddd060a3eec2677ef86319abac5fc39a0 dnsmasq-2.76-2.el7_4.2.x86_64.rpm e6021c48d7461251abf4a6bdbadc493ec435150bc63e57c255196e267fb3e7e1 dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm Source: 41f44e7d21c87685a8cfe3558f6cb37f1e87d998e7f5e8bc383e6c3471826443 dnsmasq-2.76-2.el7_4.2.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net Twitter: @JohnnyCentOS ------------------------------ Subject: Digest Footer _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org https://lists.centos.org/mailman/listinfo/centos-announce ------------------------------ End of CentOS-announce Digest, Vol 152, Issue 1 ***********************************************

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Re: [CentOS] Yum java-devel not listed installed
by Richard 02 Oct '17

02 Oct '17

> Date: Monday, October 02, 2017 16:24:20 -0700 > From: david <david(a)daku.org> > > Folks > > I performed an install of "java-devel". Several packages got > installed. So far so good. > > Yet, when I performed > yum list installed | grep java-devel > and also > yum rpm -qa | grep java-devel > > it did not show up as already installed. > > This behavior appears both on Centos7 and Centos6. This bothers me > because as a time-saving effort, I maintain the last output of "yum > list installed" and quickly determine whether it's worth running > yum. True, yum would "do nothing", but that takes several seconds. > > Is there some simple explanation? It works for all the other > packages I've installed. > > David > What gets installed with a "yum install java-devel" command is: java-1.8.0-openjdk-devel.x86_64 which is why your "yum list installed | grep java-devel" doesn't find it. If you did, instead, "yum list installed | grep java | grep devel" it would work. Your "yum rpm -qa | grep java-devel" isn't a valid yum option. The correct command: rpm -qa | grep java-devel would fail to find it for the same reason your "yum list" command did. Try instead: rpm -qa java\* | grep devel that should turn it up: java-1.8.0-openjdk-devel.x86_64 1:1.8.0.144-0.b01.el7_4 @updates Your /var/log/yum.log shows the names of the packages installed, which can help if there is confusion.

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compile webkit
by Jerry Geis 02 Oct '17

02 Oct '17

I am trying to compile webkitgtk I downloaded the webkit source, extracted CMake Error at Source/cmake/OptionsGTK.cmake:12 (message): GCC 4.9.0 is required to build WebKitGTK+, use a newer GCC version or clang I downloaded 2.14.7 - just like CentOS 7.4 has, how can I be getting a GCC error ? My goal is to get the MediaSource package in webkit working. It seems to not be enabled. Is there a better way ? Thanks, Jerry

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Display IP addresses on the system console *before* the login prompt.
by Arun Khan 02 Oct '17

02 Oct '17

I have a bunch of VBox Linux VMs (CentOS 6/7, Debian7/8/9, Ubuntu (14.0/16.04, Alpine) that get dynamic IPs. To get their respecitive IP addresses I have to login and run 'ip addr' I would like such info to be displayed on the VM console *before* the login prompt. Ideally an ASCII log + info (see below sig line). Thus, I can get the info from the VM console without having to login. I read up on /etc/issue but adding "\4{eth0}" to the existing string does not work. TIA for solutions/pointers -- Arun Khan <console display> _ _ | |__ ___ ___| |_ _ __ __ _ _ __ ___ ___ | '_ \ / _ \/ __| __| '_ \ / _` | '_ ` _ \ / _ \ | | | | (_) \__ \ |_| | | | (_| | | | | | | __/ |_| |_|\___/|___/\__|_| |_|\__,_|_| |_| |_|\___| lo: 127.0.0.1 eth0: 10.1.1.122 kernel: 4.10.0-33-generic x86_64 login: </console display>

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prevent users from fiddling with network?
by Valeri Galtsev 02 Oct '17

02 Oct '17

Dear Experts, "this is system from the hell!" Than was my first reaction when I realized that logged in with GUI (X11) user can turn off (and on) network interfaces. Without being in sudoers file. Wow, this is scary to see on workstations I manage centrally. Even though I did consider local user to be able to execute the command "shutdown" (which distinguished RedHat and CentOS from other Linux flavors: after all local user can yank power cord off the wall). Sorry about my little rant above. Could someone point me into right direction as to how do I disable the ability of (local, logged in through X11) users to fiddle with network interfaces. Even worse, they can create new profile and define for interfaces to behave differently... In the past I could just add USERCTL="no" into interface ifcfg-... file inside /etc/sysconfig/network-scripts which doesn't seen to have any effect on latest CentOS 7. What is my pilot error here? (Ignorant in new shiny extremely MS Windows like for _ignorant_ person - me - system). Thanks a lot for all your help! Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

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Network scripts ifup-post
by Thomas Plant 02 Oct '17

02 Oct '17

Hello, since updating to Centos 7.4 the ifup-post script in /etc/sysconfig/network-scripts does not behave as it did before the update. I use it to configure additional routes via /sbin/ifup-local with the parameter of the interface being upped, but it seems to pass only 'lo' as interface name. Before it passed correctly 'eth0:0' of the virtual interface. Added a line in /etc/sysconfig/network-scripts/ifup-post, near the end when it calls the ifup-local, echoing the variable of ${DEVICE} to a file and all that showed up was 'lo'. Is this a bug? Or how can I correct this behaviour? Thanks, Thomas

1 1

NUMA split mode?
by hw 02 Oct '17

02 Oct '17

Hi, HP says that what they call "NUMA split mode" should be disabled in the BIOS of the Z800 workstation when running Linux. They are reasoning that Linux kernels do not support this feature and even might not boot if it´s enabled. Since it apparently was years ago since they made this statement, I´m wondering if I should still leave this feature disabled or not. More recent kernels might support it, and it´s supposed to improve performance. Could someone explain what this feature actually is or does, and if Centos kernels support it? -- "Didn't work" is an error.

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MP4/H.264 codec for Firefox?
by Roman Kennke 02 Oct '17

02 Oct '17

Hello, I am trying to get MP4/H.264 playback in Firefox to work on my CentOS laptop (for vimeo). I installed the gstreamer plugins as described here: https://wiki.centos.org/TipsAndTricks/MultimediaOnCentOS7 (No, I did not install Flash, VLC and all the other stuff. I only want HTML5 MP4 playback..) I enabled the nux repos. I did install all available gstreamer plugins, i.e. -good -bad -ugly -ffmpeg etc. No success. Has anybody got mp4 playback working? Here's a test page: https://www.quirksmode.org/html5/tests/video.html Help would be appreciated! Best regards, Roman

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