Discuss July 2013

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167 participants
150 discussions

Cpus_allowed_list issue in RHEL6.4
by Miraj Mohamed 24 Jul '13

24 Jul '13

Hi All, I am using RHEL 6.4 on a Dell Server with 32 cores. But in the Cpus_allowed_list only 30 cores are available. Why is that? See the snippet from cat /proc/self/status: Cpus_allowed: 7fff7fff Cpus_allowed_list: 0-14,16-30 The allowed list is same for the init process as well (see below). I didn't see this issue, in RHEL 6.2. Why is that? Is there a way to change it? -miraj ------------------------------------- [root@localhost bin]# uname -a Linux localhost 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux [root@localhost bin]# [root@localhost bin]# [root@localhost bin]# cat /proc/1/status Name: init State: S (sleeping) Tgid: 1 Pid: 1 PPid: 0 TracerPid: 0 Uid: 0 0 0 0 Gid: 0 0 0 0 Utrace: 0 FDSize: 64 Groups: VmPeak: 19364 kB VmSize: 19356 kB VmLck: 0 kB VmHWM: 1544 kB VmRSS: 1544 kB VmData: 328 kB VmStk: 88 kB VmExe: 140 kB VmLib: 2348 kB VmPTE: 52 kB VmSwap: 0 kB Threads: 1 SigQ: 1/256326 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000001000 SigCgt: 00000001a0016623 CapInh: 0000000000000000 CapPrm: ffffffffffffffff CapEff: fffffffffffffeff CapBnd: ffffffffffffffff Cpus_allowed: 7fff7fff Cpus_allowed_list: 0-14,16-30 Mems_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003 Mems_allowed_list: 0-1 voluntary_ctxt_switches: 1603 nonvoluntary_ctxt_switches: 62

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rpmbuild environment CentOS5 vs CentOS6
by Peter Wood 24 Jul '13

24 Jul '13

On CentOS5 I was used to create a simple spec file where at the end I'll declare files and directories I wan't to package: --< Snip >-- %files %dir /opt/myapp %dir /opt/myapp/bin %dir /opt/myapp/etc /opt/myapp/bin/exec01 /opt/myapp/etc/myapp.conf ---- I'll copy the file in /usr/src/redhat/SPECS and run "rpmbuild -bb myapp.spec". On CentOS6 rpm-build package no longer creates the /usr/src/redhat/... directory tree. I followed the CentOS6 Wiki instructions to setup my rpmbuild environment for a regular user. When I try to build the package on CentOS6 I'm getting this error for every single file and directory: File not found: /home/peter/rpmbuild/BUILDROOT/myapp-5.2-1el6.x86_64/opt/myapp/bin/exec01 I tried to override buildroot: rpmbuild -bb --define="buildroot /" myapp.spec error: %{buildroot} can not be "/" As a workaround I can manually create /home/peter/rpmbuild/BUILDROOT/myapp-5.2-1el6.x86_64/ and copy all my file in there but that's a lot of extra work. Is there a way to get the same functionality on CentOS6 where rpmbuild will collect the files from the main / directory and build the rpm package? Thank you, -- Peter

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When no MTA is installed, How to send an email with a cronjob?
by Indunil Jayasooriya 24 Jul '13

24 Jul '13

Hi, When no MTA is installed, How to send an email with a cronjob? I have below entrty in my cronjob? my /etc/cron.d/backup file looks like this. MAILTO=myemail(a)example.com 15 11 * * * root /root/scripts/backup.sh Can I send this email via SMTP server? Hope to hear from you. -- Thank you Indunil Jayasooriya http://www.theravadanet.net/ http://www.siyabas.lk/sinhala_how_to_install.html - Download Sinhala Fonts

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NFS not exporting filesystem ACLs
by Gregory Machin 24 Jul '13

24 Jul '13

Hi. I have a test system in an lab I have copied over the /etc/sysconfig/nfs and /etc/exports from productions all the same services are running. But in the test environment the client mounts the nfs exports but the file system ACLs are not visible , what have I missed ? I have stopped the firewall on the server and that didn't help. Filesystem acls are enabled in fstab for the file system with the exports on it. We are using nfs v3 and it's configured on the server and in the mounts on the client. Thanks Greg

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Re: [CentOS] What on Centos is wiping out my eth0 IP address every 5minutes?
by Jason Pyeron 23 Jul '13

23 Jul '13

> -----Original Message----- > From: Rock > Sent: Tuesday, July 23, 2013 17:46 > > QUESTION: > Why does my Centos 6.4 laptop keep wiping out my eth0 IP address? Googling https://www.google.com/search?q=rhel+6+network+configuration&oq=rhel+6+netw… https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux… ml/Deployment_Guide/ch-Network_Interfaces.html > > SUMMARY: > a) I set the IP address of eth0 > b) Everything works fine for 2 to 5 minutes > c) Then, that eth0 IP address is (somehow?) wiped out I frustratingly > repeat that abc process (over and over and over again) What is the contents of /etc/sysconfig/network-scripts/ifcfg-eth0 ? > > BACKGROUND: > My home network has been working perfectly and there is no problem > with my home network, nor my wlan0 WiFi access from my Centos laptop > to that home broadband network. > > Inside the house, I never use the wired (eth0) NIC; but, I'm trying to > set up a wired/wireless connection outside the house and that is where > I'm running into this problem where Centos (automatically?) constantly > and repeatedly wipes out the IP address I set on eth0. > > I can easily (constantly) change the IP address of the eth0 NIC back > to what I want it to be; but that IP address only stays set for about > 2 to 5 minutes; and then it wipes itself out (again & again). > > Why? How do I stop this? > (All I want is for eth0 to *stay* at the IP address I set it to!) > > To give you more contextual detail, here's a typical sequence. > > SIMPLE BASELINE: > Wireless NIC (wlan0) is turned off using a hardware switch on the > outside of the laptop (so that only one NIC is in play). > > STARTING POINT: (eth0 has no IP address) $ ifconfig eth0 => eth0 Link > encap:Ethernet HWaddr A0:BE:C1:D8:E5:F1 > => inet6 addr: fe80::f2de:f1ff:fe38:8591/64 Scope:Link > => UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > => RX packets:3139 errors:0 dropped:0 overruns:0 frame:0 > => TX packets:3230 errors:0 dropped:0 overruns:0 carrier:0 > => collisions:0 txqueuelen:1000 > => RX bytes:2403080 (2.2 MiB) TX bytes:547895 (535.0 KiB) > => Interrupt:20 Memory:f2600000-f2620000 > > I EASILY CAN SET THE IP ADDRESS of eth0: > $ sudo ifconfig eth0 192.168.1.100 > $ ifconfig eth0 > => eth0 Link encap:Ethernet HWaddr A0:BE:C1:D8:E5:F1 > => inet addr:192.168.1.100 Bcast:192.168.1.255 > Mask:255.255.255.0 > => inet6 addr: fe80::f2de:f1ff:fe38:8591/64 Scope:Link > => UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > => etc. > > At this point, I can now connect a wire from the RJ45 port of the > laptop, to the device (which happens to be a radio set to > 192.168.1.20): > > $ ping 192.168.1.20 > => PING 192.168.1.20 (192.168.1.20) 56(84) bytes of data. > => 64 bytes from 192.168.1.20: icmp_seq=1 ttl=64 time=1.38 ms => 64 > bytes from 192.168.1.20: icmp_seq=2 ttl=64 time=0.339 ms => 64 bytes > from 192.168.1.20: icmp_seq=3 ttl=64 > time=0.255 ms ^C => --- 192.168.1.20 ping statistics --- => 3 packets > transmitted, 3 received, 0% packet loss, time 2954ms => rtt > min/avg/max/mdev = 0.255/0.660/1.388/0.516 ms > > I can even easily connect via port 80 (using Firefox on the > laptop) to this device, e.g., $ firefox http://192.168.1.20 > > In fact, time and time (and time) again, everything works just fine, > for about 2 to 5 minutes, until, invariably, I lose all connectivity! > > What seems to happen is that CentOS wipes out my IP address that I had > set for eth0. So, I lose all connectivity. > > $ ifconfig eth0 > => eth0 Link encap:Ethernet HWaddr A0:BE:C1:D8:E5:F1 > => inet6 addr: fe80::f2de:f1ff:fe38:8591/64 Scope:Link > => UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 > > I can repeat the process, and everything works again, for about 2 to > 5 minutes. Then I lose my eth0 IP address again. > > WHAT I WANT: > When I set eth0 to an IP address, I want eth0 to *stay* at that IP > address! > > My question: > Q: Why does setting an eth0 IP address only last about 5 minutes on > Centos? > What am I doing wrong? > What can I do to *keep* the IP address on eth0 that I set for eth0? > > > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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How often is kernel "touching" swap partition?
by Martin Šťastný 23 Jul '13

23 Jul '13

Hello, I am going to buy new laptop with two drives, one SSD and one HDD and I want to place swap partition on HDD which will be most time unused and therefore spinned down. Problem is, that I don't know, if or how often is kernel touching swap space even if there is lot of free memory and thus spinning HDD up. Thank you in advance

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SELinux Question
by Ken Smith 23 Jul '13

23 Jul '13

Hi Guys, My google foo is failing me this afternoon. Just configuring a new C6 install. I know there are SELinux alerts happening, eg: I know I need to enable named to write to the local .jnl file as part of dynamic DNS, but sealert -b is not listing any alerts. I can see raw audit messages. Is there some daemon I have forgotten to start or install? Thanks Ken -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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CentOS-announce Digest, Vol 101, Issue 15
by centos-announce-request＠centos.org 23 Jul '13

23 Jul '13

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-2013:1098 CentOS 6 system-config-date FASTTRACK Update (Johnny Hughes) 2. CEEA-2013:X005 Xen4CentOS e1000e Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Mon, 22 Jul 2013 14:46:41 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEBA-2013:1098 CentOS 6 system-config-date FASTTRACK Update To: centos-announce(a)centos.org Message-ID: <20130722144641.GA54049(a)n04.lon1.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Bugfix Advisory 2013:1098 Upstream details at : https://rhn.redhat.com/errata/RHBA-2013-1098.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 6e5ad619ff0414a256f5cb76c9789f258a374622166abbe26423134a5464cfcd system-config-date-1.9.60-2.el6.centos.noarch.rpm x86_64: 6e5ad619ff0414a256f5cb76c9789f258a374622166abbe26423134a5464cfcd system-config-date-1.9.60-2.el6.centos.noarch.rpm Source: 3512ffe60fcbeb6aa4d66c27390e199a0b7ac513e9668e5d0c4d2d532e6452d1 system-config-date-1.9.60-2.el6.centos.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Mon, 22 Jul 2013 10:57:06 -0500 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEEA-2013:X005 Xen4CentOS e1000e Update To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <51ED5652.3060709(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" CentOS Errata and Enhancement Advisory 2013:X005 (Xen4CentOS) The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) ----------------------------- X86_64 ----------------------------- e1000e-2.4.14-3.4.53.1.el6.centos.alt.x86_64.rpm: e135714af07c2cfccda09de474529be7a2d508ed0bc5fcd477efb9954d5fb07a ----------------------------- Source: ----------------------------- e1000e-2.4.14-3.4.53.1.el6.centos.alt.src.rpm: cd73e9955e406745b3b1ec19880295b779995092e87ba85669cf7af6f46b4e91 ================================================================== Corrected the following CentOS Bugs in this Kernel: http://bugs.centos.org/view.php?id=6562 ================================================================== e1000e Changelog info from the SPEC file: * Sun Jul 21 2013 Akemi Yagi toracat(a)centos.org - 2.4.14-3.4.53.1.el5.centos.alt - Added Makefile patch to enable mock build. * Thu Jul 18 2013 Johnny Hughes johnny(a)centos.org - 2.4.14-3.4.53.el6.centos.alt - initial build for the Xen4CentOS project - CentOS bug 6562 ================================================================== Note: This package installs a new e1000e driver that adds hardware detection for the e1000e kernel driver. It only works for the 3.4.x Xen4CentOS Kernel and must be upgraded for every new kernel. We only recommned using this if the standard kernel driver from the 3.4.x Xen4CentOS Kernel is not working for you. -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos at irc.freenode.net

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How do I debug why Centos is asking for fonts to be installed?
by Rock 23 Jul '13

23 Jul '13

Quite a few times a day, both the latest Pan & Firefox available in standard CentOS repositories elicit what (now) appears to be a CentOS request to install fonts, e.g.: http://i39.tinypic.com/2i7qm2p.png This latest message says: Pan newsreader wants to install fonts - Thai - Cherokee At first I had thought it was Pan and Firefox causing these messages, but I was just told it's actually CentOS which is making these requests. Hence, I ask: Q: How do I debug why these requests are being made? And, more importantly: Q: How do I prevent these messages from popping up?

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CentOS 6.4 doesn't work with SAMSUNG MP0402H USB harddisk, but CentOS 5.6 does
by Jiang Wen Dong 23 Jul '13

23 Jul '13

I want to make a live USB from live CD. CentOS 6.4 live CD doesn't work. Can not find root when initrd0 booting. It appears initrd0 can not find the USB harddisk - SAMSUNG MP0402H. But CentOS 5.6 live CD works fine. What can I do? Thanks. ________________________________ ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? This e-mail and its attachments contain confidential information from TD Tech Ltd., which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!

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Discuss July 2013