Disable IPv6 In RHEL

1) # vi /etc/modprobe.conf

install ipv6 /bin/true

Save and close the file.

2) # vi /etc/sysconfig/network

NETWORKING_IPV6=no
IPV6INIT=no

Save and close the file.

3) Reboot the server.

4) Verify the IP Address.

Patch Information In HPUX

1. Patch names always start with the characters PH.
2. Next 2 characters show the patch type.
   Here are the types ...
   a. Command Patches - CO
   b. Kernel Patches       - KL
   c. Network Patches    - NE
   d. Subsystem Patches - SS
3. After this, there is an underscore and a 4 or 5 digit patch number
4. You have to reboot the system after the kernel patch installation.

Network Configuration in HP-UX

Configuration File :
/etc/rc.config.d/netconf        -  Contains the hostname, ip address, default route
/etc/hosts                            -  Contains the hsotname to IP address mapping
/etc/resolv.conf                   -  Contains DNS server details
/etc/inetd.conf                     - Internet daemon configuration file

Configuration Files used for DNS Client:
/etc/nsswitch.compat
/etc/nsswitch.nis
/etc/nsswitch.ldap
/etc/nsswitch.conf
/etc/nsswitch.files
/etc/nsswitch.hp_defaults

Scripts :
/sbin/init.d/net start  - To start network services
/sbin/init.d/net stop  - To stop network services

Backup And Recovery

1. To backup a filesystem :
# fbackup -f /dev/rmt/0m -i /home

2. To list the contents of the tape media and store it in a file :
# frecover -I /tmp/indexfile -f /dev/rmt/0m

3. To do level 0 (full) backup of a filesystem and also update the file /var/adm/fbackupfiles/dates :
# fbackup -f /dev/rmt/0m -0 -u /home

4. To do a level 1 backup using a graph file to specify which files will be included/excluded :
# fbackup -f /dev/rmt/2m -1 -u -g /var/adm/fbackupfiles/graphs/g0

Graph file content may look like
i /data
e /data/tmp

5. To backup to the tape drive on the remote server :
# fbackup -f host1:/dev/rmt/0m -v -i /home

6. To backup data to two tape drives (one by one) :
# fbackup -f /dev/rmt/0m -f /dev/rmt/1m -i /data

7. To restore all the files from the tape media
# frecover -v -r -f /dev/rmt/0m

8. To show the tape drive status :
# mt -f /dev/mt/0mnb status

9. To eject a tape :
# mt -f /dev/mt/0mnb offline

10. To rewind the tape media :
# mt -f /dev/rmt/0mnb rewind

Getting Console Log in AIX and HPUX

AIX:

# alog -L : Command to get the log types on the server.

# alog -o -t boot : Command to get the boot log.

# alog -o -t console : Command to get  the console log.

HPUX:

# dmesg

# cat /etc/rc.log

HPUX HBA Firmware Upgradation

HBA which stands for Host Burst Adapter to facilitate SAN connection.

In HPUX, HBA firmware can be upgraded in 2 ways (both the method require server reboot).

1) Performing Upgradation from the EFI shell.

2) Performing from the OS level.

AIX Savecore

The default location for AIX crash dump is at /var/adm/ras with the name "vmcore.#.bz"

# represents the sequence number of the crash dump.

# sysdumpstart -p : Command to initiate a system dump and dump the crash in the primary dump device.

But the user initiated dump will not be stored in /var/adm/ras directory. To do so, We need execute the # savecore -d.

# savecore -d : Command copies the latest dump to the /var/adm/ras directory.

# sysdumpdev -t : Command to get the latest dump device name and its size.