Submit Very Basic System administration commands and win easily points

[Santhosh.H]

Suchas stopping service, disabling service, booting in single user mode, taking a backup, shutdown, rebooting, changing init levels, crash recovery, going into GSP etc

[Santhosh.H]

to change init level
#init 1--4
to go into GSP
#^B
to come out of GSP
GSP>co
to reset the system in case of hang
GSP>rs

[Scott Van Kalken]

reset a hung GSP without rebooting

stty +resetGSP


helped me a few times.

[Animesh Chakraborty]

See the attachment

[Animesh Chakraborty]

basic lvm command attached.

[Justo Exposito]

Hi,

Commands for cluster:
cmhaltpkg pkgname (shutdown the package)
cmrunpkg -v -n nodename pkgname (startup the package)
cmviewcl (Show the status for package)
cmviewcl -v (Show detailed statusby package)

Regards,

Justo.

[Paula J Frazer-Campbell]

Good Morning to all

FLASHING ATTENTION LIGHT :-


From a console session, login and press CRTL.

Enter sl (Show Logs)from the command line e.g. GSP> sl

You will be prompted to select the logs you wish to view, select "e" for the error logs.

View the error logs.

Enter q from the command line to end the session.

Enter "co" to return to the console.

The attention light should now be off.

Paula

[Justo Exposito]

Hi,

Very important and simple, to do a make recovery tape:
/opt/ignite/bin/make_recovery -ACv

Regards,

Justo.

[Michael Tully]

Hi,

Trusting and on-trusting a system.

# /usr/lbin/tsconvert (to trust)
# /usr/lbin/tsconvert (to untrust)

When trusting a system make sure that
the users know that they will need to
change their passwords.

To administer a trusted system:

# /usr/lbin/modprpw -k
(this will unlock an account)

See the man pages in the attached
thread....

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x98153d853cd9d5118ff40090279cd0f9,00.html

-Michael

[Stefan Farrelly]

Quick and easy way to check if your server just rebooted itself or crashed due to a hardware problem;

cd /var/tombstones
grep chassis $(ls | tail -1)

If it says; No HPMC chassis codes logged

Then no hardware problem. If there are some hex numbers there then you need to pass them to HP to check what hardware caused the problem.

[Justo Exposito]

Hi Again,

Go to single user mode:

shutdown (without prameters)

Regards,

Justo.

[Kenny Chau]

umount /dev/vg00/lvol1
lvextend -L larger_size /dev/vg00/lvol1
extendfs -F hfs /dev/vg00/rlvol1
mount /dev/vg00/lvol1 mount_directory

Hope this helps.
Kenny.

[Steven Sim Kok Leong]

Hi,

# sam -r

Allows you to easily restrict users in the execution of commands with root privileges.

Hope this helps. Regards.

Steven Sim Kok Leong

[Justo Exposito]

Hi,

To run a script in background mode:

myscript &
nohup myscript &

Regards,

Justo.

[Andreas D. Skjervold · Accepted solution]

Hi

Before crash!:
- /opt/ignite/bin/make_recovery -AvC
(C option to create config file used to check wether new make_recovery has to be run)
-/opt/ignite/bin/check_recovery

After crash:
- replace root disk
- insert recovery tape in drive
- boot system
- Interupt boot sequence and boot from tape
- Choose "Install HP-UX" to get things back, or "Advanced options" if you want to make filsystem changes etc.

And you are fit to go.

Andreas

[Justo Exposito]

Hi,

Basic commands to copy files and directories to a tape:
fbackup/frestore
tar
cpio
dd

Basic commands for compress/uncompress files and directories:
gzip
compress/uncompress
pack/unpack
zcat

Commands for translate from ascii dos format to Unix format and viceversa:
dos2ux
ux2dos

Commands to transfer files between boxes:
ftp
rcp
remsh hostname cat file > file

Regards,

Justo.

[Bill McNAMARA_1]

easier way to find if your system rebooted or paniced:

tail -20 /etc/shutdownlog

Other things:
-------------

# ioscan -fnk

is much much faster (and more than likely what you want to do) than a full ioscan -fn

# nettladm

Nice graphical interface to nettl subsystem logging.

/usr/sbin/remove_patches

is quite useful when short on disk space.

# mstm (or xstm)
are nice ways to check hardware paths and test hardware.

Later,
Bill

[nancy rippey]

ls -lq (long listing that will also show unprintable characters

A good way to find 'garbage' characters in an ascii file is to use 'ed'. When in the editor ',l' will produce the entire file with all unprintable characters, '.l' will give you a line at a time.

[harry d brown jr]

find / -type f -size -1000000c -exec grep -il somesting {} \;

live free or die
harry

[Jeff Machols]

if a file is not a text file

# strings file

this will give you list off man readable strings, good for core files, lvmtab...

[Mark Vollmers]

Here's a useful one (for users, too) to find running processes

ps -ef

can append this with |more for single pages, and |grep "string" to search for specifics

Once the PID number is known:

kill PID

to kill process, add -9 to force it (may cause zombie processes)

Mark

[Helen French]

1) Rastart Internet daemon services:

# inetd -c

2) Edit current cron file:

# crontab -e

3) Password file secure editor:

# vipw

4) Display and modify variables in the stable storage. In another words, change primary and alternate boot paths from command line:

# setboot

Shiju

[Craig Rants]

Determining the lbolt
You can use the following information to determine which device
generates the lbolt/timeout errors:

1f 02 6 0 00
__ __ _ _ __
| | | | |
major# | target | flags
| |
bus# lun

Per this information:

- major# (1f) is 31 in decimal, and major number 31 should be
sdisk on your system.

- bus# (02) is the card instance number to which the device is
attached.

- target (6) is the device's scsi id.

- lun (0) is the device's logical unit number.

Therefore, this device maps to /dev/dsk/c2t6d0.

C

[Jeff Machols]

ioscan -fun | grep NO

search for missing or bad hardware

[Deshpande Prashant]

HI
Build kernel manually.
#cd /stand
#cp /stand/vmunix /stand/vmunix.OLD
#cp /stand/system /stand/system.OLD

#cd /stand/build
#/usr/lbin/sysadm/system_prep -v -s system
#vi system ->edit file for needed parameters
or use kmtune to change kernel parameter
#kmtune -s -S /stand/build/system

#mk_kernel -s /stand/build/system -v
#mv /stand/build/system /stand/system

#kmupdate
#cd
#/etc/shutdown -r -y 0


Thanks.
Prashant.