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34748 discussions

Nearly Instant Karma
by Chris Olson 17 Feb '16

17 Feb '16

Our smallest network has just three systems permanently attached to a 100/1000 router. There is one additional port available to temporarily plug in a laptop. The largest systems are both Dells, one running Windows 7 and one running CentOS 6.7. The Windows 7 system supports three flavors of Linux as virtual machines. The CentOS system is often used for data file import from USB-attached devices such as cell phones, charging batteries in the USB-attached devices, and for access to external email accounts. The CentOS system was in power save mode when I plugged in a Samsung cell phone for charging and extraction of several photo files. I then moved to the Windows 7 system to do some "paper work" on a web site that is known to require the use of IE for browser access. While on the Windows 7 system I did a quick email check and responded to one of our contacts at a remote site. He was having "difficulty" with file from an external site downloaded on his Windows 7 system. I took the opportunity in my email reply to comment on the great safety and stability of Linux systems. After about two hours I returned to the CentOS 6.7 system to check on the charging status and move the photo files. Yellow lights were showing on both computer and monitor. The system display, and the optical mouse would not return to normal operation as they usually do with a quick push on the front power button. The power button light did turn green and I was able to log in via ssh from a Cygwin shell on the Windows 7 system. It took two reboots executed remotely to bring back full display and mouse functionality. I believe that this was the first time anyone has plugged in a USB device into the CentOS 6.7 system while it is in power save mode.We now have a warning tag hanging over the USB ports on the system. Is there some characteristic of CentOS systems that we should have known about that could have caused this problem? Does Yahoo web mail have an easy way to retract my gloating email?

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Alternative IP addresses
by Timothy Murphy 17 Feb '16

17 Feb '16

My CentOS-7 home server has a static IP address. Is there a simple way of organizing the hpptd server so that it is accessible through this address at a remote host, but is accessed at its 192.168 address by a laptop on the WiFi LAN? -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin

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heads up: /boot space on kernel upgrade
by Devin Reade 16 Feb '16

16 Feb '16

I have a CentOS 6 machine that was initially installed as CentOS 6.4 in May of 2013. It's /boot filesystem is 200M which, IIRC, was the default /boot size at the time. The most recent kernel update (2.6.32-573.18.1.el6) fails because of lack of space in /boot. The workaround is edit /etc/yum.conf, reduce installonly_limit from 5 to something lower (I used 3), remove the oldest kernel via 'rpm -e', and then re-apply the update. In this case, it was necessary to use the 'yum update' command line vs the Update Applet due to an incomplete transaction from the failed update. Devin

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nfs v3 issues on Centos 7
by Edsall, William (WJ) 16 Feb '16

16 Feb '16

Hello list, So I'm having a strange issue with Centos 7 mounting NFS V3. It starts with autofs. For example, my auto.share file: apps -nfsvers=3 some-server:/mnt/xfs1/& This will mount, but the first mount takes ~30 sec. After this, eventually the mount becomes stale but it still shows as connected in 'mount'. At this point, I can no longer mount NFS shares. Manual mounting example shown below. Any feedback would be appreciated - thank you! /etc/centos-release :::::::::::::: CentOS Linux release 7.1.1503 (Core) mount -t nfs -o vers=3 mdstor:/mnt/xfs1/apps tmpx -v mount.nfs: timeout set for Tue Feb 16 08:33:31 2016 mount.nfs: trying text-based options 'vers=3,addr=143.219.41.19' mount.nfs: prog 100003, trying vers=3, prot=6 mount.nfs: trying 143.219.41.19 prog 100003 vers 3 prot TCP port 2049 mount.nfs: prog 100005, trying vers=3, prot=17 mount.nfs: trying 143.219.41.19 prog 100005 vers 3 prot UDP port 892 mount.nfs: mount(2): Input/output error mount.nfs: mount system call failed Thanks, William

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Update on Kernel panic executing gkrellm.
by Lamar Owen 16 Feb '16

16 Feb '16

For what it's worth, back in April of last year I reported that gkrellm had started generating kernel panics with 7.1503's kernel. I can now report that with the latest 7.1511 kernels (327.4.5 being the latest I have installed) gkrellm is once again behaving for me. Just wanted to close the loop and say that whatever had broken has been fixed, for my hardware.

1 0

How to install packages from git.centos.org
by Tim 16 Feb '16

16 Feb '16

Hi all, how can I install rpms from git.centos.org? I'd like to install and test the realtime-kernel. It seems to me that https://wiki.centos.org/Sources only means to build srpms. What I ned is an rt-kernel with headers for further compiling. Purpose: I'd like to build a digital audio workstation and for this I'd like to try out CentOS with the following packages first: - kernel-rt - ardour - calf-plugins BTW: Is there an audio SIG? Thanks in advance Tim

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USB Serial ports (ttyACMn) CentOS 6.7 (64-bit) vs. CentOS 6.7 (64-bit)
by Robert Heller 16 Feb '16

16 Feb '16

I have two computers: both running CentOS 6.7, 64-bit, with kernel 2.6.32-573.12.1.el6.x86_64. One is a laptop with an 2 core Intel processor and the other is a desktop machine with a 4 core AMD processor. Both with selinux enabled. I have a USB serial port device (a RR-CirKits LCC-Buffer USB). On the desktop I am getting this error: sauron.deepsoft.com% sudo minicom Device /dev/ttyACM0 access failed: No such file or directory. sauron.deepsoft.com% dir -lZ /dev/ttyACM0 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM0 But it is working on the laptop! gollum.deepsoft.com% dir -lZ /dev/ttyACM1 crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyACM1 Same kernel, same device (except it is showing up as ttyACM1 on the laptop). What is going on here? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

5 8

rpm containing gmessage???
by ken 16 Feb '16

16 Feb '16

Maybe I haven't run the correct yum commands or looked in the right repo, but I haven't found a utility called 'gmessage'. Anyone know where to find it?

2 8

Re: [CentOS] USB Serial ports (ttyACMn) CentOS 6.7 (64-bit) vs. CentOS 6.7 (64-bit)
by Robert Heller 15 Feb '16

15 Feb '16

At Sun, 14 Feb 2016 19:20:48 -0500 Robert Heller <heller(a)deepsoft.com> wrote: > > At Mon, 15 Feb 2016 09:41:32 +1100 CentOS mailing list <centos(a)centos.org> wrote: > > > > > On 14/02/16 02:14, Robert Heller wrote: > > > I sent this out about a week or so ago, but I have heard nothing. I am > > > *thinking* it is a SELINUX problem, but I cannot figure out what. > > > > > > > If you suspect SELinux is to blame, have you tried putting SELinux into > > permissive mode to see that resolves the issues? > > > > setenforce 0 (re-enable with setenforce 1) > > I guess I can try that. > > > > > If everything works with SELinux in permissive mode, then you'll need to > > create a policy for it *[0]*. > > That would imply that somehow the policies on my laptop are *different* than > the policies on my desktop. *I* don't remember setting any such policies... OK, I just tested it: sauron.deepsoft.com% sudo /usr/sbin/setenforce permissive sauron.deepsoft.com% sudo minicom Device /dev/ttyACM0 access failed: No such file or directory. sauron.deepsoft.com% sudo /usr/sbin/setenforce enforcing Nope, that did not help. > > > > > > > ak. > > > > *[0]*: > > https://wiki.centos.org/HowTos/SELinux#head-faa96b3fdd922004cdb988c1989e561… > > > > > > _______________________________________________ > > CentOS mailing list > > CentOS(a)centos.org > > https://lists.centos.org/mailman/listinfo/centos > > > > > -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

2 1

safest way to mount iscsi loopback..
by lejeczek 15 Feb '16

15 Feb '16

.. what is? fellow centosians. how to you mount your loopback targets? I'm trying lvm backstore, I was hoping I would do it with uuid, but it's exposed more than once and how would kernel decide which device to use I don't know. thanks

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