USER QUOTAS IN REDHAT LINUX

USER QUOTAS

Features:

1. Limits disk usage (blocks or inodes)

2. Tied to file systems (set on a per file system basis)

3. Can be configured for users and groups

Steps to enable quota support:

1. Enable quota support per file system in: /etc/fstab

• defaults,usrquota,grpquota

2. Remount the file system(s)

• mount -o remount /

• use 'mount' to confirm that 'usrquota,grpquota' support are enabled

3. Create quota database files and generate disk usage table

• quotacheck -mcug / - this creates /aquota.user & /aquota.group

• quotacheck -mavug

4. Assign quota policies

• edquota username - set blocks/inodes soft_limits hard_limit

• edquota student1 - sets quotas for user 'student1'

• export EDITOR=nano - to have edquota default to 'nano' editor

5. Check quotas

• quota username

Ex: quota student1

Note: place 'quotacheck -avug' in /etc/cron.*(hourly,daily)

6. Report on usage

• repquota -a - this reports on usage

Note: The blocks are measured in 1K increments. i.e. 20000 blocks is roughly 20MB

SED-STREAM EDITOR

SED-STREAM EDITOR

Features:

1. Faciliates automated text editing

2. Supports RegExes (POSIX)

3. Like Awk, supports scripting using '-F' option

4. Supports input via: STDIN, pipe, file

Usage:

1. sed [options] 'instruction[s]' file[s]

2. sed -n '1p' grep1.txt - prints the first line of the file

3. sed -n '1,5p' grep1.txt - prints the first 5 lines of the file

4. sed -n '$p' grep1.txt - prints the last line of the file

5. sed -n '1,3!p' grep1.txt - prints ALL but lines 1-3

6. sed -n '/linux/p' grep1.txt - prints lines with 'linux'

7. sed -e '/^$/d' grep1.txt - deletes blank lines from the document

8. sed -e '/^$/d' grep1.txt > sed1.txt - deletes blank lines from the document
'grep1.txt' and creates 'sed1.txt'

9. sed -ne 's/search/replace/p' sed1.txt

10. sed -ne 's/linux/unix/p' sed1.txt

11. sed -i.bak -e 's/3/4' sed1.txt - this backs up the original file and creates
a new 'sed1.txt' with the modifications indicated in the command

Note:
1)Generally, to create new files, use output redirection, instead of
allowing sed to write to STDOUT
2)Sed applies each instruction to each line

KICKSTART CONFIGURATION

Features:
1. Hands-free, automated installation
2. Scripted installation
3. Script can be used on multiple systems
Note: 'system-config-kickstart' is NOT installed by default
Steps:
1. Open previously created 'anaconda-ks.cfg' file and modify
2. Define partitions accordingly
3. Confirm settings
4. Publish the 'ks.cfg' file to HTTP server
5. Install server using the following at the main menu:
'linux ks=http://192.168.75.100/ks.cfg'
Note: The following can be used to boot a kickstart installation:
1. boot.iso CD-ROM
2. First CD-ROM of the RH5 installation set
3. The DVD-ROM of the RH5 installation set
4. USB Pen/Stick - diskboot.img (use dd)