Discuss May 2014

discuss@lists.centos.org

165 participants
146 discussions

Re: [CentOS] Mother board recommendation
by Joseph Hesse 04 Jun '14

04 Jun '14

On 05/16/2014 10:28 AM, Dave Stevens wrote: > Quoting Joseph Hesse <joehesse(a)gmail.com>: > >> Hello, >> >> I want to build a lightweight server and install centos. Does anyone >> have a recommendation for a suitable motherboard? >> >> Thank you, >> Joe > > there are lots of motherboards that might do; in my experience make > sure it has lots of top end for memory, 32 gigs is not hard to find. > you also need to consider how many cpus cores drives other > peripherals. really it's a large topic. check ebay too, I found a nice > supermicro two cpu opteron board with 8 cores and 16G ram for $250. > > D > >> _______________________________________________ >> CentOS mailing list >> CentOS(a)centos.org >> http://lists.centos.org/mailman/listinfo/centos >> > > > Thank you for your reply. I am currently using, as a server, a workstation computer. It was built with a gigabyte motherboard and has 8G ram and a 1000G Sata 3 drive. It is accessed with ssh and runs an ftp server, a web server and a samba server so my wife can back up her pc to it. It is running behind a router. This computer more than meets my needs as a lightweight server except the hardware is dying and I want to replace it. The question in my mind is: should I just buy another workstation class motherboard and duplicate what I already have or buy a motherboard which is intended to be used as a server? Thank you, Joe

6 12

Centos box and Cisco 3750 VLAN's
by Boris Epstein 04 Jun '14

04 Jun '14

Hello all, I have a CentOS box that has a NIC (eth0) on which I defined 4 VLAN's (counting the NIC itself): eth0, eth0.1, eth0.2 and eht0.3. Initially the Cisco switch was not partitioned into VLAN's which means that the only VLAN running on it was the default one (VLAN 1). I have then played with VLAN's a bit on the switch and at this point have two: VLAN 1 (which is default and can not be deleted) and VLAN 3. The CentOS box is plugged into a trunk port on VLAN 3 which by virtue of being a trunk should belong to all VLANs. However, this does not seem to work as expected. What I get is the following: 1) eht0 does not come up at all. ifup eth0 Device eth0 does not seem to be present, delaying initialization 2) eth0.3 comes up fine. 3) Other VLAN's do not come up. No error messages, just never show up. Any insight into this would be most welcome. Primarily, I fail to understand why all those VLAN's came up on VLAN 1 and why now even VLAN 1 does not come up - even though the trunk port the device is plugged into is supposed to be a member of all VLAN's. Thanks in advance. Boris.

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Mother board recommendation
by Joseph Hesse 04 Jun '14

04 Jun '14

Hello, I want to build a lightweight server and install centos. Does anyone have a recommendation for a suitable motherboard? Thank you, Joe

7 6

Newer version of ffmpeg for EL6?
by Lists 03 Jun '14

03 Jun '14

We're trying to build a rich media website, and will need to re-encode the video content with ffmpeg. Unfortunately, the ffmpeg version that comes with the most common repos are rather out of date. As in 0.6.5 vs 2.21 being the most current version. However, ffmpeg looks to be a pretty thorny thing to compile with all the options we need. It appears that the FFMPEG with rpmfusion for Fedora is pretty current, 2.1.4. Is there a repo out there that anybody knows of that has a relatively current version of ffmpeg out for Centos 6? Thanks in advance, Ben

3 3

Re: [CentOS] clamav
by Filip Bartmann 03 Jun '14

03 Jun '14

On Thu, 29 May 2014 21:53:53 -0700 Emmett Culley <lst_manage(a)webengineer.com> wrote: > Every time I update my system with clamav, it doesn't restart and > freshclam no longer works, because of a permission issue on the log > directory. Each time I update clamav I have to search the Internet > to figure out what there is to do. That NEVER helps so I try > different combinations on user and group in amavis-new and clamav > configuratio files, until I eventually get them both to work. > > I am getting clamav and amavisd update from the epel repo. What can > I do to prevent this from happening? I have same issue, and i have after each update change permissions of /var/log/clamav and /var/lib/clamav to amavis.amavis. Filip Bartmann

7 14

nodejs, epel, SCL
by Eugene Vilensky 02 Jun '14

02 Jun '14

Hello, With SCL and epel repositories enabled, some dependencies for the package name 'nodejs' get satisfied with libs from SCL which are placed in paths that are not part of my user's environment. Is there a method to make sure that nodeJS from epel dependencies are only satisfied from epel? For example, the http parser dependency gets satisfied by nodejs010-http-parser-2.0-5.20121128gitcd01361.el6.centos.alt.x86_6 http-parser-2.0-4.20121128gitcd01361.el6.x86_64 : HTTP request/response parser for C Repo : epel Matched from: Filename : /usr/lib64/libhttp_parser.so.2 Other : libhttp_parser.so.2()(64bit) Filename : /usr/lib64/libhttp_parser.so.2.0 http-parser-2.0-4.20121128gitcd01361.el6.i686 : HTTP request/response parser for C Repo : epel Matched from: Other : libhttp_parser.so.2 Filename : /usr/lib/libhttp_parser.so.2 Filename : /usr/lib/libhttp_parser.so.2.0 nodejs010-http-parser-2.0-5.20121128gitcd01361.el6.centos.alt.x86_64 : HTTP request/response parser for C Repo : scl Matched from: Filename : /opt/rh/nodejs010/root/usr/lib64/libhttp_parser.so.2 Filename : /opt/rh/nodejs010/root/usr/lib64/libhttp_parser.so.2.0 Other : libhttp_parser.so.2()(64bit)

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traffic distribution not happening in centos 6.5
by Varun Sharma 02 Jun '14

02 Jun '14

Hi, I am experimenting with libnetfilter_queue. libnetfilter_queue is a userspace library providing an API to packets that have been queued by the kernel packet filter. I am using sample code(nfqnl_test.c) available on netfilter.org. I have generated two binaries (queue0 and queue1) using that nfqnl_test.c sample code. These binaries are working as per expected behaviour in case of Centos 6.2 but with Centos 6.5 only one queue is receiving network traffic. I am not able to understand why only one queue is receiving network traffic in case of Centos 6.5 whereas same network traffic is being distributed in both the queues with Centos 6.2. uname –a :- Linux hwcentos8 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Machine Info: 16 core machine with 64GB RAM. Command used for iptables in Centos 6.5 :- iptables -A INPUT -j NFQUEUE --queue-balance 0:1 Output In Centos 6.5 :- [varun@exp2 ~]$ ./queue0 opening library handle unbinding existing nf_queue handler for AF_INET (if any) binding nfnetlink_queue as nf_queue handler for AF_INET binding this socket to queue '0' setting copy_packet mode pkt received queue0 hw_protocol=0x0800 hook=1 id=0 hw_src_addr=fc:4d:d4:d3:7f:73 indev=2 payload_len=40 entering callback pkt received queue0 hw_protocol=0x0800 hook=1 id=1 hw_src_addr=fc:4d:d4:d3:7f:73 indev=2 payload_len=40 entering callback pkt received queue0 hw_protocol=0x0800 hook=1 id=2 hw_src_addr=fc:4d:d4:d3:7f:73 indev=2 payload_len=40 entering callback pkt received queue0 hw_protocol=0x0800 hook=1 id=3 hw_src_addr=fc:4d:d4:f1:e1:5f indev=2 payload_len=78 entering callback [varun@exp2 ~]$ ./queue1 opening library handle unbinding existing nf_queue handler for AF_INET (if any) binding nfnetlink_queue as nf_queue handler for AF_INET binding this socket to queue '1' setting copy_packet mode Please let me know if more information is required. Regards varun

2 2

CentOS 6 KVM networking: What am I missing???
by Robert Heller 02 Jun '14

02 Jun '14

OK, I have a strange problem. It is probably something simple/stupid, but I cannot figure it out. I have a nice new PowerEdge T20 that I installed CentOS 6 (6.5) on with Virtualization (KVM). I then installed Ubuntu 14.04 in a virtual machine, with a bridged network: ------ begin ub140464.xml------------------ <domain type='kvm' id='2'> <name>ub140464</name> <uuid>53f7caec-1ff8-3bcd-3387-781dbc686907</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64' machine='rhel6.5.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/vg_newserver00/ub140464'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='usb' index='0'> <alias name='usb0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:11:43:29'/> <source network='virbr1'/> <target dev='macvtap0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/1'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/1'> <source path='/dev/pts/1'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> </graphics> <sound model='ich6'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='selinux' relabel='yes'> <label>system_u:system_r:svirt_t:s0:c369,c592</label> <imagelabel>system_u:object_r:svirt_image_t:s0:c369,c592</imagelabel> </seclabel> </domain> ------ end ub140464.xml -------------------- ------ begin virbr1.xml --------------------- <network connections='1'> <name>virbr1</name> <uuid>c2621cc7-49d7-a94d-d682-a77a3f1fcbef</uuid> <forward dev='em1' mode='bridge'> <interface dev='em1' connections='1'/> </forward> </network> ------ end virbr1.xml --------------------- The Ububtu VM can connect to the LAN the T20 is on and off into the public Internet. Machines on the LAN (eg my laptop) can connect to Ububtu VM. *BUT* the host server cannot connect to the Ububtu VM and the Ububtu cannot connect to the host server. Netstat -r on the T20 (host server): [root@newserver ~]# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 em1 192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0 link-local * 255.255.0.0 U 0 0 0 em1 default server1.wendell 0.0.0.0 UG 0 0 0 em1 Netstat -r on the Ubuntu VM: heller@ub140464:~$ netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default server1.wendell 0.0.0.0 UG 0 0 0 eth0 192.168.1.0 * 255.255.255.0 U 0 0 0 eth0 (server1 is the older PowerEdge server running CentOS 5 that *presently* serves as the router to the public Internet and is also the dhcp and DNS server for the LAN. Eventually, the new T20 server will take that over, once it is fully set up.) I have set up VMs like this on my CentOS 5 (Xen) machine without any problems, but I must be missing something here. -- Robert Heller -- 978-544-6933 / heller(a)deepsoft.com Deepwoods Software -- http://www.deepsoft.com/ () ascii ribbon campaign -- against html e-mail /\ www.asciiribbon.org -- against proprietary attachments

4 3

Centos 6.5
by Manjunath N 31 May '14

31 May '14

Hi, I am using centos 6.4. i am trying to update /proc/sys/fs/epoll/max_user_instances but it seems like it is not supported anymore in /etc/sysctl.conf. How do we update max_user_instances on centos 6.4? Thanks & Regards Manjunath

2 1

"new" computers and monitors
by Michael Hennebry 31 May '14

31 May '14

Until recently, I had a 32-bit machine with one monitor running fedora. The later editions of fedora didn't like it, so I switched to CentOS. Now I have two 64-bit machines and two monitors and a CenturyLink router. Also a KVM switch that I have not taken out of the package. My main machine has two video connections and two ethernet connections, eth0 and eth1 . I've never had more than one machine or more than one monitor before. I'd like to be able to use both monitors at once on my main machine. I'd like to be able to switch one monitor between machines without too much trouble. I'd rather not where the pins out. KVM will do this, right? KVM is transparent to the computer, right? My secondary machine sometimes runs Windows, so I'd like it not to have its own global IP address. My first thought would be to connect it directly to one of the ethernet ports on my main machine. How do I go about this? The answer I am expecting is one or more links to tutorials or the like. -- Michael hennebry(a)web.cs.ndsu.NoDak.edu "SCSI is NOT magic. There are *fundamental technical reasons* why it is necessary to sacrifice a young goat to your SCSI chain now and then." -- John Woods

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Discuss May 2014