[CentOS] CentOS 6 kickstart missing 'shell command prompt' screen at ALT+F2
Hi, I've recently setup a centos 6 kickstart environment. Interesting fact is that the helpful 'shell command prompt' screen is missing when I press ALT+F2 key combination even on locally connected keyboard and monitor. ( my kickstart runs in text mode). All other screens can be found without issues with ALT+Fn key combination. I googled internet, and found someone reported similar issues, say, here is one link: http://serverfault.com/questions/322374/kickstart-virtual-console-no-shell-prompt-at-alt-f2. I read the link several times and still dont quite see why this happens, got confused at the following places: 1, when -- at which installation stage -- the 'shell command' screen will show up?2, if centos 6.6 and 6.7 comes without 'shell command prompt' screen with default installation media, then which installation media contains the file(s) that we can tune? /etc/inittab doesn't contain the entries related to tty consoles. Centos 7.x doesn't have the issues and it looks like centos 7 leverages a new method to get shell command prompt. Many thanks in advance. Best,David ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Is there a way to detect/validate DHCP static IP assignment?
Wow, it works perfectly! all solved. Thanks. -- David On Thursday, March 31, 2016 11:46 AM, David Copperfield wrote: Hi tris, Many thanks, I'll give the perl script a try shortly Best,David On Thursday, March 31, 2016 6:00 AM, Tris Hoar wrote: On 30/03/2016 18:08, David Copperfield wrote: > Hi, > We have tens of networks(VLANs) in data center with a central Linux DHCP >server. each network has their router to do the DHCP relay. So, the DHCP >server's configuration files has tens 'subnet' statements. > Because PXE booting is standard in whole data center, there are also > thousands of static MAC-IP mapping 'host' statements in dhcp configuration. > The big challenge with a central dhcp server is how to detect typo in the > thousands of MAC-IP 'host' statements? -- a single char/digit typo here will > fail a PXE booting or download wrong post-installation snippets. > > Is there a tool to validate all 'host' statements from another Linux box? > > I tried nagios check-dhcp plugin, with a series of real MAC addresses(for > hosts in other different networks). Surprisingly, the IP address came back > were not the static IP addresses in 'host' statement, but dynamic addresses > in the pool defined for this particular network (where I ran check-dhcp from). > check_dhcp was run with the following arguments: > > /usr/lib64/nagios/plugins/check_dhcp --verbose --server= > --interface=eth0 --mac= --unicast > remove --unicast doesn't help but just see more DHCP replys. > Interestingly, with a same MAC address, and the above same command, from two > Centos boxes on different network there will be different dynamic IPs! > instead the static IP defined with 'host' statement. > > So, how can we validate static IP assignment? Thanks. > Best,David, > Hi David, You need to use check_dhcp_relayed.pl (https://github.com/timb07/check_dhcp_relayed) if you wish to test for a reservation outside of the servers subnet, otherwise the DHCP server will assume you are on the local range and issue from that subnet. Also as an FYI Forman (http://theforeman.org) can do things like building VM's and Physical servers and integrates with DHCP to create static DHCP reservations for PXE booting servers which should eliminate typos. Tris * This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify postmas...@bgfl.org The views expressed within this email are those of the individual, and not necessarily those of the organisation * ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Is there a way to detect/validate DHCP static IP assignment?
Hi tris, Many thanks, I'll give the perl script a try shortly Best,David On Thursday, March 31, 2016 6:00 AM, Tris Hoar wrote: On 30/03/2016 18:08, David Copperfield wrote: > Hi, > We have tens of networks(VLANs) in data center with a central Linux DHCP >server. each network has their router to do the DHCP relay. So, the DHCP >server's configuration files has tens 'subnet' statements. > Because PXE booting is standard in whole data center, there are also > thousands of static MAC-IP mapping 'host' statements in dhcp configuration. > The big challenge with a central dhcp server is how to detect typo in the > thousands of MAC-IP 'host' statements? -- a single char/digit typo here will > fail a PXE booting or download wrong post-installation snippets. > > Is there a tool to validate all 'host' statements from another Linux box? > > I tried nagios check-dhcp plugin, with a series of real MAC addresses(for > hosts in other different networks). Surprisingly, the IP address came back > were not the static IP addresses in 'host' statement, but dynamic addresses > in the pool defined for this particular network (where I ran check-dhcp from). > check_dhcp was run with the following arguments: > > /usr/lib64/nagios/plugins/check_dhcp --verbose --server= > --interface=eth0 --mac= --unicast > remove --unicast doesn't help but just see more DHCP replys. > Interestingly, with a same MAC address, and the above same command, from two > Centos boxes on different network there will be different dynamic IPs! > instead the static IP defined with 'host' statement. > > So, how can we validate static IP assignment? Thanks. > Best,David, > Hi David, You need to use check_dhcp_relayed.pl (https://github.com/timb07/check_dhcp_relayed) if you wish to test for a reservation outside of the servers subnet, otherwise the DHCP server will assume you are on the local range and issue from that subnet. Also as an FYI Forman (http://theforeman.org) can do things like building VM's and Physical servers and integrates with DHCP to create static DHCP reservations for PXE booting servers which should eliminate typos. Tris * This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify postmas...@bgfl.org The views expressed within this email are those of the individual, and not necessarily those of the organisation * ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] Is there a way to detect/validate DHCP static IP assignment?
Hi, We have tens of networks(VLANs) in data center with a central Linux DHCP server. each network has their router to do the DHCP relay. So, the DHCP server's configuration files has tens 'subnet' statements. Because PXE booting is standard in whole data center, there are also thousands of static MAC-IP mapping 'host' statements in dhcp configuration. The big challenge with a central dhcp server is how to detect typo in the thousands of MAC-IP 'host' statements? -- a single char/digit typo here will fail a PXE booting or download wrong post-installation snippets. Is there a tool to validate all 'host' statements from another Linux box? I tried nagios check-dhcp plugin, with a series of real MAC addresses(for hosts in other different networks). Surprisingly, the IP address came back were not the static IP addresses in 'host' statement, but dynamic addresses in the pool defined for this particular network (where I ran check-dhcp from). check_dhcp was run with the following arguments: /usr/lib64/nagios/plugins/check_dhcp --verbose --server= --interface=eth0 --mac= --unicast remove --unicast doesn't help but just see more DHCP replys. Interestingly, with a same MAC address, and the above same command, from two Centos boxes on different network there will be different dynamic IPs! instead the static IP defined with 'host' statement. So, how can we validate static IP assignment? Thanks. Best,David, ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] ananconda update.img creation fails: generated but with wrong python version in /usr/sbin/anaconda contained
Hi all, I've created an anaconda update.img file per instructions at https://fedoraproject.org/wiki/Anaconda/Updates for Centos 7.2. The problem is that the update.img file contains references to python3 (say, file /usr/sbin/anaconda), and so the all installation fails immediately. My question is: what are the steps to create an anaconda update image appropriate for a particular centos release? Thanks a lot. The steps I have performed (to create an update.img) are listed below: 1) find the version of ananconda that centos 7.2 installation media: 21.48.22.56-1. 2) follow the instructions at the above wiki page, and wiki https://fedoraproject.org/wiki/Anaconda. Run the following command (to generate update.img): 2.1 yum -y install git 2.2 git clone https://fedoraproject.org/wiki/Anaconda 2.3 cd anaconda 2.4 scripts/makeupdates -t anaconda-21.48.22.56-1 3) save the generated image to place under .../images directory. From what I see, all PXE clients did download the new update.img file and merge the changes contained. But because the updated anaconda pointed to python3 instead of python 2.7.5 (the version comes with installation media), the installation process failed immediately. Thanks. Best,David ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
