Discuss April 2016

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150 participants
130 discussions

meminfo
by Hadi Motamedi 11 Apr '16

11 Apr '16

Dear All As far as I know , to check for the amount of installed RAM on my centos server I checked it as: #more /proc/meminfo Can you please let me know how can I check for the instantaneous occupied amount of my RAM the similar way the task manager shows it on my Win server ? Thank you in advance

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UDP de-fragmentation problem
by Volker 11 Apr '16

11 Apr '16

Hi all. I have a strange problem at hand regarding UDP fragmentation on Centos7: Applications are unable to receive UDP packets which have undergone fragmentation UNLESS the netfilter modules are loaded. The problem arose on a application which would run fine on OpenSuse but does not work on Centos7. The application processes UDP data and on Centos only small packets are received and processed, packets below the fragmentation size limit of about 1500 bytes. UDP packets which have undergone fragmentation are not received by the application. The application in question uses Qt, which opens the UDP socket in non-blocking mode - apparently that's an issue because reading from the socket in blocking mode does not cause the problem. By chance I hit on the fact that once the netfilter kernel-modules (nf_nat, iptable_nat, nf_nat ...) are loaded the problem disappears and UDP packets of all sizes are correctly delivered and processed. NOTES: - I'm not using netfilter. My iptables are empty, firewalld is not running. - Other networking applications -at least tcp- are working fine: webbrowsing, ssh, nfs etc even DNS - Does not happen on Opensuse regardless if netfilter modules are loaded or not. - Does not happen on Opensuse on the same machine. Does happen on different machines on Centos7. So it's not HW dependend - There is AFAIK nothing special about my Centos7 installation. Out of the box install, simple network config, latest updates applied. - Rebuilding the application on Centos7 with centos supplied gcc, libs etc does not make the problem go away. - I have broken the application down to a small Qt test program which opens a UDP socket, binds and waits on it This is an strace output of the problem, where a 10000 byte UDP packet is send to the application, triggers the select(), then the recvfrom(7...) fails with eagain [...] socket(PF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 7 fcntl(7, F_GETFL) = 0x2 (flags O_RDWR) fcntl(7, F_SETFL, O_RDWR|O_NONBLOCK) = 0 setsockopt(7, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0 bind(7, {sa_family=AF_INET, sin_port=htons(10001), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 getsockname(7, {sa_family=AF_INET, sin_port=htons(10001), sin_addr=inet_addr("0.0.0.0")}, [16]) = 0 getpeername(7, 0x7ffdf3073470, [16]) = -1 ENOTCONN (Transport endpoint is not connected) getsockopt(7, SOL_SOCKET, SO_TYPE, [2], [4]) = 0 select(8, [3 7], [], [], NULL) = 1 (in [7]) recvfrom(7, 0x7ffdf3072e1b, 1, 2, 0x7ffdf3072e20, 0x7ffdf3072e1c) = -1 EAGAIN (Resource temporarily unavailable) select(8, [3 7], [], [], NULL [...] And after the netfilter modules are loaded: [...] socket(PF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 7 fcntl(7, F_GETFL) = 0x2 (flags O_RDWR) fcntl(7, F_SETFL, O_RDWR|O_NONBLOCK) = 0 setsockopt(7, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0 bind(7, {sa_family=AF_INET, sin_port=htons(10001), sin_addr=inet_addr("0.0.0.0")}, 16) = 0 getsockname(7, {sa_family=AF_INET, sin_port=htons(10001), sin_addr=inet_addr("0.0.0.0")}, [16]) = 0 getpeername(7, 0x7ffc5939e8c0, [16]) = -1 ENOTCONN (Transport endpoint is not connected) getsockopt(7, SOL_SOCKET, SO_TYPE, [2], [4]) = 0 select(8, [3 7], [], [], NULL) = 1 (in [7]) recvfrom(7, "x", 1, MSG_PEEK, {sa_family=AF_INET, sin_port=htons(60921), sin_addr=inet_addr("10.77.32.30")}, [16]) = 1 recvfrom(7, "x", 1, MSG_PEEK, {sa_family=AF_INET, sin_port=htons(60921), sin_addr=inet_addr("10.77.32.30")}, [16]) = 1 recvfrom(7, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 65536, 0, {sa_family=AF_INET, sin_port=htons(60921), sin_addr=inet_addr("10.77.32.30")}, [16]) = 10000 recvfrom(7, 0x7ffc5939e0bb, 1, 2, 0x7ffc5939e0c0, 0x7ffc5939e0bc) = -1 EAGAIN (Resource temporarily unavailable) select(8, [3 7], [], [], NULL [...] Any help? bug? Regards .....Volker

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How to set hostname and domainnmae in CentOS 7?
by Joe Smithian 10 Apr '16

10 Apr '16

We can permanently set hostname using hostnamectl set-hostname. How can we permanently set *domain name* in CentOS 7? I found an article <http://unix.stackexchange.com/questions/239920/how-to-set-the-fully-qualifi…> that recommended setting FQDN using hostnamectl. Is that the right way to set hostname and domainname at the same time using *hostnamectl set-hostname* command? Running *hostnamectl set-hostname* will set the hostname in* /etc/hostname* but it doesn't change */etc/hosts*. What's the proper way of adding hostname and FQDN to */etc/hosts *in CentOS 7? Thanks, Joe

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Kernel 2.6.32-573.22.1.el6.x86_64, higher than usual load
by Johnny Carlsen 09 Apr '16

09 Apr '16

Hi, After switching to the 2.6.32-573.22.1.el6.x86_64 kernel (CentOS 6) a few weeks ago I have noticed that my servers are now reporting a much higher idle load. The servers are being monitored with Zabbix, and there is a clear difference between the older kernel 2.6.32-573.12.1 and the newer 2.6.32-573.12.1. I can see the problem on both physical and virtual servers. You can see the Load Average chart here from one of our servers: http://imgur.com/U1eihMX The server is pretty much idle all the time, but the load average increased from 0.001 to 0.300 when updated to the new kernel. Is anyone else seeing the same behavior? Best Regards, Johnny Carlsen ________________________________ CONFIDENTIAL AND PRIVILEGED: This e-mail and associated content is subject to the disclaimer statement found at http://aware.co.th/emaildisclaimer/rev1-0.php.

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hi
by Bill Baso 08 Apr '16

08 Apr '16

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Tool to Manage KVM with Web Browser
by FrancisM 08 Apr '16

08 Apr '16

Hi All, Is there someone out there using web browser to manage multiple KVM host servers right now in checking the MIST.IO Cloud platform and there are lot more from the http://linux-kvm.org/page/Management_Tools but Im not sure what is the best for me. The first requirement is of-course it should be open-source with zero cost and stable for daily operation. Anyone can help me decide or advice the best web tools for KVM. many thanks

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CentOS-announce Digest, Vol 134, Issue 6
by centos-announce-request＠centos.org 08 Apr '16

08 Apr '16

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Openshot 2.x (beta) on C7??
by Fred Smith 08 Apr '16

08 Apr '16

I'm interested in trying out the new OpenShot beta (2.06) on CentOS 7. Openshot requires Python3. so I look at available packages where I find a bunchof python3 packages as well as python34 packages. I'm assuming that python34 is version 3.4 of python, while python3 is some other 3.x version. Can anyone here explain to me what are the differences, any compatibility across these versions, and how to tell which I need for OpenShot? Thanks in adva ce! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The Lord is like a strong tower. Those who do what is right can run to him for safety. --------------------------- Proverbs 18:10 (niv) -----------------------------

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CentOS 7.2 rootfs for i386
by kavitha bk 07 Apr '16

07 Apr '16

Hi I want to build a small rootfs for 32 bit CentOS to the same I plan to build the entire OS but I see https://wiki.centos.org/HowTos/I_need_the_Kernel_Source kernel_build for 32 bit is not supported . Please let me know anybody has built the same Thanks Kavitha

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CentOS-announce Digest, Vol 134, Issue 5
by centos-announce-request＠centos.org 07 Apr '16

07 Apr '16

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. Release for CentOS Linux 7 Rolling media March 2016 (Karanbir Singh) ---------------------------------------------------------------------- Message: 1 Date: Thu, 7 Apr 2016 02:18:59 +0100 From: Karanbir Singh <kbsingh(a)centos.org> To: CentOS Announcements List <centos-announce(a)centos.org> Subject: [CentOS-announce] Release for CentOS Linux 7 Rolling media March 2016 Message-ID: <5705B583.2030704(a)centos.org> Content-Type: text/plain; charset=utf-8 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I am pleased to announce general availability of the March 2016 snapshot for CentOS Linux. This release includes CentOS Linux 7 iso based install media, Generic Cloud images, Atomic Host, Docker containers, Vagrant images, vendor hosted cloud images. This release set is tag'd 1603 and includes all updates released upto the 31st of March 2016. CentOS Linux rolling builds are point in time snapshot media rebuild from original release time, to include all updates pushed to mirror.centos.org's repositories. This includes all security, bugfix, enhancement and general updates for CentOS Linux. Machines installed from this media will have all these updates pre-included and will look no different when compared with machines installed with older media that have been yum updated to the same point in time. All rpm/yum repos remain on mirror.centos.org with no changes in either layout or content. - -------- CentOS Linux 7 / x86_64 install media is available at http://buildlogs.centos.org/rolling/7/isos/x86_64/ File: CentOS-7-x86_64-Minimal-1603-02.iso Sha: 58ee68c3ffae5c4ca629be9b992f97d108165e09726d3e8f80798ac9c7a1821e File: CentOS-7-x86_64-Everything-1603-02.iso Sha: f618b51bbbfbbc5a1d2fe64cb699735057f79df41125bad5be6eef11b4f7c575 File: CentOS-7-x86_64-DVD-1603-02.iso Sha: f78dcd1040afcdbb716c0581a182365ff34b7b37e9c20aa40b521b3c42677744 - -------- CentOS Linux 7 / x86_64 Cloud Images are available at : http://cloud.centos.org/centos/7/images/ Sha: c88230cde563ca29b065d53819586262f79a64769736e014bf6dabaa61a20968 File: CentOS-7-x86_64-GenericCloud-1603.qcow2 Sha:6d17808cf208bee3243f51b84e9bfb10b06f0cd04e2930505d9ea4fba2583bc5 File: CentOS-7-x86_64-GenericCloud-1603.qcow2c Sha: f91e602120a728f144da605baf0d5f4ad59293921bee99cc4aa3a1ab65e6d445 File: CentOS-7-x86_64-GenericCloud-1603.qcow2.xz Sha:5c5cacfc1f0700cc7d48d667933cd730f7443e866caeda94d8e205a8bc8ce511 File: CentOS-7-x86_64-GenericCloud-1603.raw.tar.gz - -------- CentOS Atomic Host is being release announced shortly. - -------- CentOS Linux 7 / x86_64 Vagrant images are updated at https://atlas.hashicorp.com/centos/7 and the backing files can be downloaded for libvirt and virtualbox providers at : Libvirt: http://cloud.centos.org/centos/7/vagrant/x86_64/images/CentOS-7-x86_64-V agrant-1603_01.LibVirt.box Sha: 4e01796e1afdd8c4bfbe98cffe5966caee227629429657a06c56d93d6e5fadaf Virtualbox: http://cloud.centos.org/centos/7/vagrant/x86_64/images/CentOS-7-x86_64-V agrant-1603_01.VirtualBox.box Sha: 549542fb475a02b7477000dded6dc7d12e7e325e461f029d25831eb9bb208a4b - -------- CentOS Linux 5 / 6 and 7 docker images are updated at https://hub.docker.com/_/centos/ - -------- We welcome all feedback around these rolling builds and media updates at the centos-devel mailing list ( http://lists.centos.org/ ). enjoy! - -- Karanbir Singh, Project Lead, The CentOS Project +44-207-0999389 | http://www.centos.org/ | twitter.com/CentOS GnuPG Key : http://www.karan.org/publickey.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBAgAGBQJXBbWDAAoJEI3Oi2Mx7xbtkhQIAKWdQsR+3toahhrc/859kfXW Y3tyvRVU3t/i7i4bs+4jtwT4zih8rEP4DBNYQE/lkv7gusjWANiuvr9FtTrNCj5c 7mGhTOFQtNG7AqGEHfQLKcdkCM4LMUbINhOhAqzymX9Vvj/jznyqenBNBlbwj9Cc yQR0aEeGPKFLhzUQqBBBW7B8UT1GzEr6l3+d+V7zEXdUJkSVaCiM2rMBEdEK41P/ 1sYCcuodBPaTGFVEFPSPZf5sq/fMWQasKfx164xu0Sdi0QQUer7CzwRMlDev649x yXbzF4Fkhs89JomXM6js19IArjA+HSAOWFu+jiHyp14OFGjReEkEfOcm+swIJ9g= =Ob+s -----END PGP SIGNATURE----- ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org https://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 134, Issue 5 ***********************************************

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Discuss April 2016