UBC Physics & Astronomy
dns.phas.ubc.ca  - 142.103.236.1
DNS server  /  DHCP server  /  BOOTP server

UPS Status       DNS Diagnostics and Tools       dnstop: watch dns in action in a shell (e.g. dnstop eth1)       
IBM x305, 1U, Machine Type: 8673-43X
Flash EEPROM rev level: PLE146AUS, System Board S/N KP-KH111, BIOS date:  01/15/03
2.4GHz Pentium 4, 
2 Gb RAM (4x512Mb),
2 x 18 GB SATA drives in a software RAID 1 (mirror) configuration, 
2 Intel 100/1000 Gigabit NICs
Flash EEPROM rev level: PLE146AUS
System Board S/N KP-KH111
BIOS date:  01/15/03
DISASTER RECOVERY
  1. Install a new server.
  2. Do the following: 
       scp root@secure.phas.ubc.ca:/wwws/sysadmin/Computers/00_Servers/rhel/satellite_setup.pl .
   chmod +x satellite_setup.pl
   ./satellite_setup.pl
   yum clean all
   yum update
   yum install bind bind-chroot
   
   chgrp -R named domain
   ls /usr/share/doc/bind-*/sample/var/named/*
   cp -R /usr/share/doc/bind-*/sample/var/named/* /var/named/chroot/var/named/
   chgrp -R named /var/named/chroot/var/named/
   chmod -R g+w /var/named/chroot/var/named/
   chmod g+s /var/named/chroot/var/named/data
   chmod g+s /var/named/chroot/var/named/slaves/
   yum install rsync
   vim /etc/rsyncd.conf
   yum install xinetd
   vim /etc/hosts.allow
   cd /etc/sysconfig/
   cp iptables iptables.orig
   vim iptables
   service iptables restart
   vim /etc/selinux/config
   setenforce 0
   sestatus
   yum install dhcp
   chkconfig --list | grep -i dhcp
   chattr +i /var/named/chroot/etc/named.conf
   lsattr /var/named/chroot/etc/named.conf
   service named start
   rndc status
   vim /root/.ssh/authorized_keys
Additional, non-critical items to take care of:
  1. Install APCUPSD

Install boot loader on second SW RAID disk


As root, get a grub command prompt and then do:

1) Do find /boot/grub/stage1 to find which partitions have the required Grub files in /boot/grub. If you have a separate partition for /boot, do find /grub/stage1 instead:

grub> find /grub/stage1
(hd0,1)
(hd1,1)
grub>

The output could be different, depending on the partition where /boot is located.

2) Asumming your disks are /dev/sda (hd0) and /dev/sdb (hd1) and you have grub installed in the MBR of /dev/sda, do the following to install grub into /dev/sdb MBR:

Use the "device" command of the grub shell to tell grub that (hd0) is the drive we are installing into, regardless of it's present position. Then whichever drive boots, it will look for its files on its own first partition (hd0,0). 
> device (hd0) /dev/sdb

device (hd0) /dev/sdb
> root (hd0,1)

root (hd0,1)
 Filesystem type is ext2fs, partition type 0xfd
> setup (hd0)

setup (hd0)
 Checking if "/boot/grub/stage1" exists... no
 Checking if "/grub/stage1" exists... yes
 Checking if "/grub/stage2" exists... yes
 Checking if "/grub/e2fs_stage1_5" exists... yes
 Running "embed /grub/e2fs_stage1_5 (hd0)"...  27 sectors are embedded.
succeeded
 Running "install /grub/stage1 (hd0) (hd0)1+27 p (hd0,1)/grub/stage2 /grub/grub.conf"... succeeded
Done.

That is telling grub to assume the drive is hd0 (the first disk in the system).
Thus, if the first fails, the second will play the role of the first one, and so the MBR will be correct.

rndc: connect failed: 127.0.0.1#953: connection refused   this error often appears after an update/upgrade. 
root@dns2$ chmod g+w /var/named/chroot/var/run
root@dns2$ chmod g+w /var/named/chroot/etc/rndc.key
root@dns2$ service named restart
root@dns2$ /usr/sbin/rndc reload

dnstop installation 
wget http://pkgs.repoforge.org/dnstop/dnstop-0.0.20080502-1.el6.rf.i686.rpm
rpm -Uch dnstop-0.0.20080502-1.el6.rf.i686.rpm
Dmesg | more