Linux Lab 09 Troubleshoot Tools And Locate Files

Linux Workshop

Lab 9 Troubleshoot tools and locate files Requirements

Quick Reference Objectives to learn

➢ Running Linux ➢ findutils-locate package

Troubleshooting & Status tools

To Do

top

#Continuous cpuinfo, memory (M), tasks

watch cat /proc/meminfo

#Show memory every 2 sec. See free

vmstat

#Virtual memory statistics

cd /var/log; tail -f messages ...

#Show continuous logfile(s)

dmesg

#Show kernel ring buffer

less /var/log/dmesg

#Show bootlog messages (q for quit)

cat /var/log/boot.log

#Show bootlog messages

ps -aux ¦ less

#Show process status including PID's

watch df

#Show disk free space every 2 sec

fsck. /dev/sda1

#File system check

ps -aux ¦ less

#Show process status including PID's

ps -ef

1. Only for the Quick Reference commands which you are unfamiliar with:

pstree ¦ less

#Show process status tree using names

kill [-15] PID

#Kill process using a PID nr and signal: #1 HUP (hangup, reread config file)

Execute the Quick Reference commands to see the results.

#2 INT () #3 QUIT (core dump) #9 absolute KILL #15 TERM (default, close normally) killall [-15] processname

#Kill process using a processname

grub-install /dev/hda

#Inst. bootldr in MBR of master IDE-dsk

Locate files locate namepart

#findutils-locate package needed

updatedb

#Runs every night (cron job for locate)

find . -name *namepart*

#Find filenames with namepart in it #Starting in . (current directory)

find . -perm +6000 -uid 0

#Find any (+) 4000¦2000 perm. for root

find . -perm -2

#Find only (-) 'world writable bit'

Theory Modules LPIC 1 Certification Bible, isbn 0-7645-4772-0 ➢ p. 77-82 Managing processes (ps, top, nice) ➢ p. 248-251 Locating files ➢ p. 212-216 Checking the File System (fsck, df, du)

Extra References ➢ www.tldp.org

© October 2, 2005, wiki.novell.com/index.php/Roberts_Quick_References, author of Foundations of Linux networking