Discuss February 2014

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153 discussions

Growing HW RAID arrays, Online
by Billy Crook 24 Feb '14

24 Feb '14

We add disks to an LSI raid array periodically to increase the amount of available space for business needs. It is understood that this process starts with metal, and has many layers that must each adjust to make use of the additional space. Each of these layers also says that it can do that 'online' without interruption or rebooting. But making it happen is not that easy. When the HW raid controller's grow completes, we echo 1 to /sys/bus/scsi/devices/#:#:#:#/rescan and the kernel notices and updates the size of the block device. (sdc in this case) sdc1 is the only partition on the device, and should consume the entire device. sdc1 is a PV in a VG that holds production data and must not become unavailable at any time. After growing sdc as mentioned earlier, parted notices that the end-of-drive partition table is missing, fixes it, and grows its disk size to match the new size of sdc. It all makes sense up to this point. but what happens next is what I need some advice on. How do we grow sdc1, online? parted says it doesn't support 'resize' on the filesystem (LVM PV). The usual answer to parted's lack of support for filesystems, and insistence to only resize partitions when it can stick its nose in the filesystem and do that too is: parted sdc rm 1, parted mkpart primary 0% 100% (thus making a new partition "Around" the old one) That should work, but I can't get the kernel to 'notice' that sdc1 is now larger. hdparm -z barfs up an error that sdc is in use. I know that rebooting likely will fix it. But we cannot reboot. We also cannot keep making more partitions every time we add a disk. So that's not a solution either. We need to GROW the gpt partitions online, or use another partitioning type that supports >6TB I've googled it for hours and found no good solutions. This same situation would affect VMs with virtual disks that grow over time to satisfy business needs, as well as servers mounting iSCSI/FC storage that grows over time. How would you grow this online? Going without partitions at all and putting the pv directly on sdc is no good either. So we need partitions, and msdos tables don't support >2TB and the only other in practical use that I know of is gpt, and thse aparently can't expand online! Here's where I'm at now in case you're curious [root@host lib]# parted /dev/sdc unit s print free Model: SMC SMC2108 (scsi) Disk /dev/sdc: 8189439999s Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 34s 8189439966s 8189439933s primary Information: Don't forget to update /etc/fstab, if necessary. [root@host lib]# cat /sys/bus/scsi/devices/0\:2\:2\:0/block\:sdc/size 8189440000 [root@host lib]# cat /sys/bus/scsi/devices/0\:2\:2\:0/block\:sdc/sdc1/size 7019519933 # I bet the above 7billion will be around 8billion at the next reboot. (Each physical disk has about a billion sectors -- Billy Crook * Network and Security Administrator * RiskAnalytics, LLC

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transparent_huge_pages problem (again?)
by Dennis Jacobfeuerborn 22 Feb '14

22 Feb '14

Hi, I've experiencing problems with 6.5 guests on a 6.4 host when running hadoop with transparen_huge_pages enabled. As soon as I disable that feature everything returns to normal. I'm posting here because this issue cam up in the past: http://bugs.centos.org/view.php?id=5716 That bug was closed with "resolved in EL6.4" but now it seems to have returned. Apparently there exists an old bug (presumably resolved) upstream here: https://bugzilla.redhat.com/show_bug.cgi?id=805593 Since I don't have access to it I'm not sure what the current state is. What are my options here? Should I reopen the CentOS bug above or should I file a new one upstream? Regards, Dennis

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CentOS-announce Digest, Vol 108, Issue 12
by centos-announce-request＠centos.org 22 Feb '14

22 Feb '14

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://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. CEBA-2014:0191 CentOS 6 postfix Update (Johnny Hughes) 2. CEBA-2014:0193 CentOS 6 libvirt Update (Johnny Hughes) 3. CEBA-2014:0190 CentOS 6 initscripts Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 20 Feb 2014 10:50:32 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2014:0191 CentOS 6 postfix Update To: centos-announce(a)centos.org Message-ID: <20140220105032.GA24343(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2014:0191 Upstream details at : https://rhn.redhat.com/errata/RHBA-2014-0191.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: dc6929fc12329033b74a336b1b4686ff3e0dd0dd9a7883000934aaabcae2ec0a postfix-2.6.6-6.el6_5.i686.rpm 30aff82e8b1f6fdc847568c842100b327218d8b0a1f86e61011d7e0658090a84 postfix-perl-scripts-2.6.6-6.el6_5.i686.rpm x86_64: 47c5fa2ebd6e5d13a6f8b7ba192f58cea943383742f5d8825573bf415ca45262 postfix-2.6.6-6.el6_5.x86_64.rpm fcd47553e9cbbdccec4e322d524d6b412b2df5e5d525fe6beeca2bccef24542b postfix-perl-scripts-2.6.6-6.el6_5.x86_64.rpm Source: 9933dbca6400315694b5cf5c35cb447f20e973432e7d40f1fc0531a95f3c4d3a postfix-2.6.6-6.el6_5.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Thu, 20 Feb 2014 10:52:14 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2014:0193 CentOS 6 libvirt Update To: centos-announce(a)centos.org Message-ID: <20140220105214.GA24641(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2014:0193 Upstream details at : https://rhn.redhat.com/errata/RHBA-2014-0193.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: a854eb336c4993d3eb96b85d0883106b81782e8f9c9b27c24cad24f61de07068 libvirt-0.10.2-29.el6_5.4.i686.rpm 4600f1faaafb2bcd72f55ee52d740202d12a3c8b423e3aa32577d1e3db1cb47c libvirt-client-0.10.2-29.el6_5.4.i686.rpm f5d7c4fe4c1361cea68c2d830e45c1fae267ca0192c6cf5e0b77d5eba9038a92 libvirt-devel-0.10.2-29.el6_5.4.i686.rpm 3ac8d188f164881ce6a1411facf9fee330d0dcf5e3813c32aa962489f4b66590 libvirt-python-0.10.2-29.el6_5.4.i686.rpm x86_64: effa26a853e805dcdf922584591d716e316e88bc996e92e53aa5d1be6ba5838d libvirt-0.10.2-29.el6_5.4.x86_64.rpm 4600f1faaafb2bcd72f55ee52d740202d12a3c8b423e3aa32577d1e3db1cb47c libvirt-client-0.10.2-29.el6_5.4.i686.rpm a30c8104228cff0fd83cc618a50d2c83fc9fb23177d3f4b75707e52252c4d266 libvirt-client-0.10.2-29.el6_5.4.x86_64.rpm f5d7c4fe4c1361cea68c2d830e45c1fae267ca0192c6cf5e0b77d5eba9038a92 libvirt-devel-0.10.2-29.el6_5.4.i686.rpm 2e3b3badebec3160f699ea904ced1dd6f3d0ce19376b4a615e302e4256daec81 libvirt-devel-0.10.2-29.el6_5.4.x86_64.rpm 0c73745a62bacf86dfc7666af2ed99da8b7d16c5f56ef9706e5a928c3778f9a0 libvirt-lock-sanlock-0.10.2-29.el6_5.4.x86_64.rpm 0956b31a9c4cf253d3279f9edc63d944f4db44f1cd1b44ebddf9c37f4a5851f1 libvirt-python-0.10.2-29.el6_5.4.x86_64.rpm Source: bf47c06c4cfa9cf067a236bb496e2da4f7cab45881ddf9f3c5275344fe71a4a0 libvirt-0.10.2-29.el6_5.4.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 3 Date: Thu, 20 Feb 2014 10:53:40 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2014:0190 CentOS 6 initscripts Update To: centos-announce(a)centos.org Message-ID: <20140220105340.GA24869(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2014:0190 Upstream details at : https://rhn.redhat.com/errata/RHBA-2014-0190.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: aa360fd0c9db26e8f4e777a2702a9d6a5603520688826b6c4cea1417953fd83e debugmode-9.03.40-2.el6.centos.1.i686.rpm 9c34ed5a53acb2d02a209d85325d457ba391f23b3eeb4a94c1dc1e8f32675aa7 initscripts-9.03.40-2.el6.centos.1.i686.rpm x86_64: 772f1e1cd0c956505b61e2a443618b6ddf8918a619333c9cd733f0284127eb91 debugmode-9.03.40-2.el6.centos.1.x86_64.rpm 88def6dc91e77a1dfd6dce9c67a1b27a60d919e1dfdce62ec65a60bd87a606d0 initscripts-9.03.40-2.el6.centos.1.x86_64.rpm Source: 49558ba5efe723368db70a2d855f0485e7229eab69ed9e12290d30ecb6744ddc initscripts-9.03.40-2.el6.centos.1.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 108, Issue 12 ************************************************

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Re: [CentOS] KVM/NAT issue SOLVED
by david 21 Feb '14

21 Feb '14

At 12:40 PM 2/21/2014, you wrote: >On Fri, Feb 21, 2014 at 1:55 PM, david <david(a)daku.org> wrote: > > Dear Linux Gurus > > > > I'm having problems with KVM and networking. My guest cannot use NAT > > through the host's connection. This is what I've done: > > > > I installed a new version of Centos 6.5 on the hardware. Starting > > with a Net-Install, I selected the Virtual Hosting, and later added > > "Desktop". I ran "yum update" with some reboots until nothing > needed updating. > > > > The host networking is IPV4 only, using DHCP. (A different box on my > > home network provides DHCP and is a gateway to the internet. I have > > a reservation in that DHCP so that the host always gets a known IP address) > > > > Using a Gnome desktop, as a non-root user, I installed Windows 7 Pro > > from an image of an ISO I had copied onto the host. In the > > "Networking" configuration, I chose "DEFAULT". The documentation of > > KVM seems to imply that it should give me a NAT'ted interface to my > > host's connection (I wasn't worried about performance at this point). > > > > When the installation was complete, Windows tries to configure the > > network. Running the Windows command line "IPCONFIG" program, the > > Windows guest program does get an IP address from the host > > (192.168.122.xxx), but the guest cannot communicate to the outside > > world. I can ping the host, but nothing else. > > > > Is there some other magic sauce, perhaps in the IPTABLES of the host, > > that will allow the guest to use the internet? I'm baffled. > >Do you have ip_forwarding enabled in sysctl? > >https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux… > >-- > Les OOOPS <Putting that white pointy hat on my head and sitting in the corner> It's so obvious, I forgot. In my "normal" installations, that's taken care of by my scripts so I forgot to do it by hand.

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KVM/NAT help requested
by david 21 Feb '14

21 Feb '14

Dear Linux Gurus I'm having problems with KVM and networking. My guest cannot use NAT through the host's connection. This is what I've done: I installed a new version of Centos 6.5 on the hardware. Starting with a Net-Install, I selected the Virtual Hosting, and later added "Desktop". I ran "yum update" with some reboots until nothing needed updating. The host networking is IPV4 only, using DHCP. (A different box on my home network provides DHCP and is a gateway to the internet. I have a reservation in that DHCP so that the host always gets a known IP address) Using a Gnome desktop, as a non-root user, I installed Windows 7 Pro from an image of an ISO I had copied onto the host. In the "Networking" configuration, I chose "DEFAULT". The documentation of KVM seems to imply that it should give me a NAT'ted interface to my host's connection (I wasn't worried about performance at this point). When the installation was complete, Windows tries to configure the network. Running the Windows command line "IPCONFIG" program, the Windows guest program does get an IP address from the host (192.168.122.xxx), but the guest cannot communicate to the outside world. I can ping the host, but nothing else. Is there some other magic sauce, perhaps in the IPTABLES of the host, that will allow the guest to use the internet? I'm baffled. On the KVM host, this is the result of "iptables -L" -------------------------------------- Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT icmp -- anywhere anywhere ACCEPT all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT) target prot opt source destination ------------------------------------- Thanks for your help. David

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CentOS x86_64 6.4
by Steve Clark 21 Feb '14

21 Feb '14

Hi List, Strange problem. I am running off of CentOS x86_64 6.4 usb key that is sdb I have ssd disk that has a centos image on it. I have mounted the partitions /dev/sda3 as /mnt/sysimage and /dev/sda1 as /mnt/sysimage/boot I am trying to chroot to /mnt/sysimage dir but get the following error. [root@localhost root]# /usr/sbin/chroot /mnt/sysimage /bin/bash /usr/sbin/chroot: failed to run command `/bin/bash': No such file or directory [root@localhost root]# ls /mnt/sysimage/ bin dev home lost+found opt root selinux sys usr boot etc lib media proc sbin smb tmp var [root@localhost root]# ls /mnt/sysimage/bin/bash /mnt/sysimage/bin/bash [root@localhost root]# ls /bin/bash /bin/bash [root@localhost root]# ls -al /mnt/sysimage/bin/bash -rwxr-xr-x 1 root root 903272 Feb 21 2013 /mnt/sysimage/bin/bash [root@localhost root]# file /mnt/sysimage/bin/bash /mnt/sysimage/bin/bash: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dyn amically linked (uses shared libs), for GNU/Linux 2.6.18, stripped I can't figure out why this doesn't work. I use to be able to do this. Anyone have any ideas. -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark(a)netwolves.com http://www.netwolves.com

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eclipse now crashing on CentOS 5.10
by m.roth＠5-cent.us 21 Feb '14

21 Feb '14

Got a user screaming... his 5.10 workstation, first time since the upgrade java-openjdk 1.7.0.51-2.4.4.2 Anyone else seeing that? I logged onto his machine, and I don't use eclipse, at all, so there shouldn't be a lot of crap in my .eclipse, and it shows the splash window, then tells me it's crashed in another pop-up, and it's gone. The error log it tells me about says, in its very long java dump, at the end: !SESSION Fri Feb 21 11:50:46 EST 2014 ------------------------------------------ !ENTRY org.eclipse.core.launcher 4 0 2014-02-21 11:50:46.215 !MESSAGE Exception launching the Eclipse Platform: !STACK java.lang.NullPointerException at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:186) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952) Time to downgrade openjdk? mark

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Best way to virtualize Windows XP on Centos
by Frank Cox 21 Feb '14

21 Feb '14

I may have a need to run some version of Windows (XP?) on my desktop. As this will likely be a short-term thing, and since I have never used Windows, I would like to do this in the most painless way possible. A method that requires me to make the least changes to my Centos computer would be nice, since I'll probably want to back it out again later. I have never used any of the current virtualization technologies, so it's all new to me. My objective is to have Window run in a window on my desktop. I don't want to dual-boot my computer. I was looking at virtualbox. Is this the best approach? I get the impression that there are special kernel modules that are required for virtualbox, but if I install dkms then that will be automatically handled for me whenever there is a kernel upgrade. Install dkms, install the virtualbox repo, install virtualbox rpms, set up image, done. Is that all there is to it? Would something other than virtualbox be better? Any recommendations or suggestions will be appreciated. Thanks! -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com

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failed drive on an HP dl580 G5
by m.roth＠5-cent.us 21 Feb '14

21 Feb '14

The hpacucli works... but what isn't clear to me, even with googling, is whether I have to do something from the utility, or whether I can just pull the failed drive out of the hot-swap bay and put another in. I *do* see that I have to re-enable the drive, or rescan it, but right now, I'm concerned about just pulling the dead one out. mark

1 1

createrepo command for 6.4 respin
by Steve Clark 21 Feb '14

21 Feb '14

Hi List, I have been searching for the correct createrepo command to make a 6.4 respin. We have been doing this with previous versions using createrepo -u "media://$discinfo" -g ${DIR}/my_kickstart${VER}/comps.xml . Which had worked fine until now. Thanks, -- Stephen Clark *NetWolves* Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark(a)netwolves.com http://www.netwolves.com

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