Discuss December 2014

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167 discussions

Re: [CentOS] One-time reboot into alternate kernel?
by tony＠softins.co.uk 16 Dec '14

16 Dec '14

In article <20141215113303.E0AE4A00424(a)mail.centos.org>, Rushton Martin <JMRUSHTON(a)qinetiq.com> wrote: > If you are using GRUB 0.97 (legacy GRUB), then this capability is > provided by the "default saved" and "fallback" commands. See sections > 4.3.1 and 4.3.2 in the manual: > > http://www.gnu.org/software/grub/manual/legacy/grub.html Excellent - just what I was looking for. Thanks! Tony > >-----Original Message----- > >From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On > >Behalf Of Tony Mountifield > >Sent: 15 December 2014 11:01 > >To: centos(a)centos.org > >Subject: [CentOS] One-time reboot into alternate kernel? > > > >Apologies if this should be well-known, but I couldn't find anything! > > > >Situation: a system in a remote location, with no KVM, IPMI or iLO, and > >therefore no console access, only ssh. Multiple kernels listed in > >grub.conf. > > > >Is there a way to reboot temporarily into one of the other kernels > >listed in grub.conf, without changing the default= line, so that a > >subsequent reboot will default back to the original kernel? > > > >The problem I have is that having changed the default= line to select a > >kernel that doesn't boot properly, I need to have someone visit the > >console in order manually to select the working kernel again. I would > >like to avoid that situation if possible. > > > >Thanks, > >Tony -- Tony Mountifield Work: tony(a)softins.co.uk - http://www.softins.co.uk Play: tony(a)mountifield.org - http://tony.mountifield.org

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Using a "compose key" on Centos6
by Fred Smith 15 Dec '14

15 Dec '14

Hi all! I ran into a description of how to set up a compose key for F21 and decided to see if it would work on C6. Well, the right configuration dialog exists, and I can choose a key to use, but after completion, the compose key doesn't seem to work. It works like a charm on Centos-7, though. If I select Right Win as the compose key, typing <compose>ae results in "�" as I expect. but doing the same thing on Centos-6 gives me an unadorned "ae", not the ligature, but the individual characters. i.e., it doesn't do anything helpful. Since the keyboard setup dialog includes the options to define a compose key I'm going to assume it's supposed to work, and th at I'm just overlooking something. Anybody got any good suggestions? thanks! -- ------------------------------------------------------------------------------- Under no circumstances will I ever purchase anything offered to me as the result of an unsolicited e-mail message. Nor will I forward chain letters, petitions, mass mailings, or virus warnings to large numbers of others. This is my contribution to the survival of the online community. --Roger Ebert, December, 1996 ----------------------------- The Boulder Pledge -----------------------------

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[OT} Odd tmux behaviour on exit
by James B. Byrne 15 Dec '14

15 Dec '14

CentOS-6.6 tmux-1.6 (epel) Twice now I have experienced the situation where upon exiting from a tmux initiated session on a remote host instead of returning to the originating session I see this in the session terminal display: <pre> ················································································ ·································<infinite>····································· . . . <infinite lines of dots> . . . ·································<infinite>····································· ················································································ <pre> If I resize the terminal window then the dots expand to fill the available display. The scroll-back is not affected. I am unable to regain control of that terminal session from within the session itself. Looking at the processes runnin on that host from a direct ssh session shows this: <pre> # ps -ef | grep ssh root 1502 1 0 Dec12 ? 00:00:06 /usr/sbin/sshd root 10798 1502 0 10:00 ? 00:00:09 sshd: root@pts/0 root 13015 10810 0 10:12 pts/1 00:00:08 ssh inet07 -t -Y tmux || /bin/bash root 13017 1502 0 10:12 ? 00:00:08 sshd: root@pts/2 root 15622 1502 0 10:45 ? 00:00:00 sshd: root root 16033 1502 1 10:47 ? 00:00:00 sshd: root@pts/3 root 16099 16038 3 10:48 pts/3 00:00:00 grep ssh [root@inet07 ~]# ps -ef | grep 10810 root 10810 10809 0 10:00 pts/1 00:00:00 -bash root 13015 10810 0 10:12 pts/1 00:00:08 ssh inet07 -t -Y tmux || /bin/bash root 16113 16038 0 10:48 pts/3 00:00:00 grep 10810 [root@inet07 ~]# ps -ef | grep 10809 root 10809 1 0 10:00 ? 00:00:03 tmux root 10810 10809 0 10:00 pts/1 00:00:00 -bash root 16115 16038 3 10:48 pts/3 00:00:00 grep 10809 </pre> pts/3 is the diect ssh connection. pts/1 appears to be the tmux session instigated from the ssh login pts/2. I am guessing that the problem is somewhere in the shutdown of pts/1. If I kill 13015 (pts/1) from the direct ssh connection then I return control of the tmux session back to the terminal and I remain logged on to the remote host. If I then exit the remote host I return to the original host as expected. Tmux is called from the original session using a function named sshtn as defined below: # declare -f sshta () { ssh "$*" -t -Y 'tmux a || tmux || /bin/bash' } sshtn () { ssh "$*" -t -Y 'tmux || /bin/bash' } Anyone have any ideas on what might be causing this; and is there any way of preventing it? In this instance I had opened an X-Window application (gvim) in the remote tmux instance and had subsequently shut that down prior to exiting. Nonetheless, I am wondering if that has anything to do with the situation. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3 -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Pre-packaged Python 2.7 for 32-bit CentOS 6?
by Alfred von Campe 15 Dec '14

15 Dec '14

Either this doesn’t exist or my Google-foo is failing me this morning. I keep coming across the Software Collections Repository (http://wiki.centos.org/AdditionalResources/Repositories/SCL), but that is for 64-bit only. Before I attempt to create Python-2.7 RPMs for 32-bit CentOS 6 to install into /usr/local or /opt/python-2.7, I wonder if someone else has done this so I don’t have to re-invent the wheel. Thanks, Alfred

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Re: [CentOS] need guidance on getting started...again
by James B. Byrne 15 Dec '14

15 Dec '14

On Mon, December 15, 2014 05:43, John Doe wrote: > From: Darr247 <darr247(a)gmail.com> > >> And logging in as root for everyday tasks is generally discouraged, as well. >> Most admins will edit their /etc/sudoers file to give themselves sudo >> access, so they could run >> [username@machinename ~]$ sudo yum install man-1.6f* man-pages-3.22-* >> (which will then prompt for the user's password, not the root password) >> instead of logging in as root. > > > I must be a bad admin because I rarely use sudo (only to limit > some access to some commands to some users). > > That would make me prepand 99% of my daily commands with sudo. > After a while, that gets annoying... > IMHO, this rule is good for users/workstations, not admins/servers. > > And even on my workstation I have a dedicated root window where I do root > stuff. +1 from another 'bad-admin' I log on at the console with a non-privileged account. But then I immediately go into the X-Windows desktop and open a logon terminal session. There I su -l to root and leave it open; tmux'ing over ssh from there to all the other hosts as required. I do have that 'root' terminal session profiled with a red background. Just to remind me of where I am. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] UC One-time reboot into alternate kernel?
by Rushton Martin 15 Dec '14

15 Dec '14

If you are using GRUB 0.97 (legacy GRUB), then this capability is provided by the "default saved" and "fallback" commands. See sections 4.3.1 and 4.3.2 in the manual: http://www.gnu.org/software/grub/manual/legacy/grub.html >-----Original Message----- >From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On >Behalf Of Tony Mountifield >Sent: 15 December 2014 11:01 >To: centos(a)centos.org >Subject: [CentOS] One-time reboot into alternate kernel? > >Apologies if this should be well-known, but I couldn't find anything! > >Situation: a system in a remote location, with no KVM, IPMI or iLO, and >therefore no console access, only ssh. Multiple kernels listed in >grub.conf. > >Is there a way to reboot temporarily into one of the other kernels listed >in grub.conf, without changing the default= line, so that a subsequent >reboot will default back to the original kernel? > >The problem I have is that having changed the default= line to select a >kernel that doesn't boot properly, I need to have someone visit the >console in order manually to select the working kernel again. I would >like to avoid that situation if possible. > >Thanks, >Tony >-- >Tony Mountifield >Work: tony(a)softins.co.uk - http://www.softins.co.uk >Play: tony(a)mountifield.org - http://tony.mountifield.org >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. QinetiQ may monitor email traffic data and also the content of email for the purposes of security. QinetiQ Limited (Registered in England & Wales: Company Number: 3796233) Registered office: Cody Technology Park, Ively Road, Farnborough, Hampshire, GU14 0LX http://www.qinetiq.com.

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need guidance on getting started...again
by Clayton Kirkwood 15 Dec '14

15 Dec '14

Hello, It's been about 15 years since I've enjoyed working in the Unix space, and I am trying to reintegrate myself. A few things have changed in the intervening years. I've installed the first Centos6 iso without too much difficulty, but I am rusty on commands and such. It appears the install doesn't install mans so would somebody suggest a way to find and install them. It appears that there are several install package implementations. Which is the best to use? Any other helpful guidance would be greatly appreciated. I'm going with Centos 6 because I only have a 32 bit machine, otherwise I'd be up on 7, I would think. Thanks, Clayton You can tell the caliber of a man by his gun--c. kirkwood

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Error: libusb-1.0.so.0 is needed....
by ken 15 Dec '14

15 Dec '14

Trying to install Canon printer driver package (rpm), I get a dependency error: libusb-1.0.so.0 is needed.... The version currently installed on my 5.9 system is libusb-0.1.12-6.el5 and, AFAIK (per yum), no upgrade to that is available. So question: Do higher centos versions have libusb-1.0.so ? (We could perform a quick inventory with: uname -r; rpm -q libusb Thanks.

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Howto install Centos6/7 Comcast WA/OR
by david 15 Dec '14

15 Dec '14

Has anyone managed to install a Centos6 or Centos7 in Washington or Orgegon, or anywhere else that Comcast has deployed the IPV6to4 routers. The router in question is a Xfinity DCP3939 Router with Wireless, and I'm trying to get a Centos system working behind that router (with a wired connection), and enable SSH access from outside. Does one have to enable both IPV6 and IPV4? Can I enable IPV6 after install, or do I have to restart the installation from scratch (it has Centos6 installed via an earlier IPV4 router). How does one configure the router so that its DHCP system awards a known address to that machine, and how to forward port 22? The extra problem is that I'm trying to advise the owner of this configuration remotely. Behind that same router he has a working Windows 7 machine, and I can use Team Viewer to view the router's configuration from "inside". Any assistance would be appreciated. Comcast is of no help. David

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Broadcom wireless card: installation script for Linux-STA driver
by Niki Kovacs 15 Dec '14

15 Dec '14

Hi, I just installed CentOS 6.6 on my HP Pavilion DM1 laptop. The wireless card is only poorly supported in the default setup, so I decided to write an installation script for the Linux-STA driver, which works perfectly. https://github.com/kikinovak/centos/blob/master/6.x/broadcom-sta/broadcom-s… Grab the files: # git clone https://github.com/kikinovak/centos Run the script: # cd centos/6.x/broadcom-sta # broadcom-sta.sh Reboot and you're ready to go. Cheers, Niki -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Discuss December 2014