Question RHCSA

1. Set your system as Examiner can login your system as root user and password is TomBigBee. restart vm machine On boot time press any key Press “e” for edit Select – kernel /LVlinuz-***** and press “e” Type 1 and press enter Press “b” (then it will boot single user mood)Sh # setenforce 0Sh # passwd Sh # redhatSh # init 5

2. You read the file /root/network and check your NIC configuration.Solution: #cat /root/network

# vim /etc/hosts (Set Host name)# setup # (Check ONBOOT=yes from following location)#system-config-network or vim /etc/sysconfig/network-script/ifcfg-eth0

# service network restart (Restart Network)

N.B: NetworkManager (Disable from ntsysv)

3. Dig server1.example.com successfully resolves that hostname using DNS.Solution: To set DNS #vi /etc/resolv.conf(example: nameserver 192.168.1.1)

Question

4. All rpms are available in /var/ftp/pub/rhel6/Server/Packages and /var/ftp/pub/update directory on the server server1.example.com or 192.168.1.254. Install dialog packageSolution:# vim /etc/yum.repos.d/base.repo [base]

name=Red Hat Linux 6baseurl=ftp://server1.example.com/pub/rhel6/Serverenabled=1gpgcheck=0

# yum install dialog* -y

yum related command

# yum list dialog# yum list all# rpm -qa | grep httpd* (Find out if httpd package installed or not)# yum list installed httpd (Find out if httpd package installed or not)# yum list httpd (to search for package by name)# yum install httpd (to install the package )# yum remove httpd (to remove the package)# yum info httpd (Find information about a package) # yum clean all (too clear cash)

5. Create a user with id 3456useradd -u 3456 armsid username (Check)useradd -u 105 -s /bin/bash (with shell)

6. Create three users and a group that:User khalid is a member of group officestuff as secondary groupUser ruhul is a member of group officestuff as a secondary groupUser neo not a member of group officestuffUser neo has no interactive shell.Password of all users must be password

Solution:# groupadd officestuff# adduser –G officestuff khalid# adduser –G officestuff ruhul# adduser –s /sbin/nologin neo# cat /etc/passwd# passwd khalid# passwd ruhul# passwd neo

7. Make sure the permission on the /officedata directory that:All member of group officestuff can create a file or directory in that directoryMember of group officestuff can modify each other file in that directoryOther user can only read file or access subdirectory in that directory

Solution:# mkdir /officedata# chgrp officestuff /officedata# chmod 2775 /officedata# ls –ld /officedata

8. Copy the file /etc/fstab in to the directory /var/tmp that: This file has no execution permission The file ownership must be root:root User khalid can read and modify this file User ruhul can read this file Other user neither read or write this file

Solution:# cp /etc/fstab /var/tmp (ACL) (SELINUX EFFECT)# ls –la /var/tmp/fstab# vim /etc/fstab /var ext4 defaults,acl 1 2# mount –o remount,acl /var# getfacl /var/tmp/fstab (chek permision)# setfacl –m u:khalid:rw- /var/tmp/fstab# setfacl –m u:ruhul:r-- /var/tmp/fstab# setfacl –m o::0 /var/tmp/fstab# getfacl /var/tmp/fstab (conform permision)

9. Create a new logical volume size 300 MB called myswap from the existing volume group. And make a swap partition using myswap. Also make sure it will be available after reboot.

Solution:# vgs # lvcreate -L 300M -n myswap vg_name# mkswap /dev/vg_name/myswap [create the swap file system]# swapon /dev/vg_name/myswap [mount the swap]# free [check ]# vim /etc/fstab [/dev/lvname/myswap swap swap defaults 0 0]

10. Extend logical volume varfs 2GB to 2.3GB. Solution:

# lvextend –L 2.3G /dev/vgname/lvname #resize2fs /dev/vol0/varfs

11. You must export /home/new to the example.com network. Test the below command to check the exported share for localhost.showmount –e localhost

Solution:# yum install nfs* rpcbind*

#chkconfig rpcbind on # chkconfig nfs on

# vim /etc/exports /home/new *.example.com(rw)

#service rpcbind start# service nfs start# showmount –e localhost

Test output

12. Enable IP forwardingSolution:

# vim /etc/sysctl.conf net.ipv4.ip_forward = 1

13. Network Time Proticol: StationX must synchronize its time via NTP Server server1.example.com or 192.168.1.254

Solution:# chkconfig ntpd on # system-config-date# synchronize system date and time over the network # add server1.example.com ok

14. To update installation your OS kernel that: Download the update kernel that is available on ftp://server1.example.com/pub/rhel6/update directory for anonymous Both kernels are listed in the grub menu. System will run automatically with the new kernel Examiner has 5 second to switch old kernel at the grub menu

Answer:# wget ftp://server1.example.com/pub/rhel6/update# uname –r or uname –ra or cat /etc/grub.conf (check present kernel verion)# rpm –ivh kernel*

15. You must install the share printer on your system to connect shared printer using IPP that Location of the demo print server is server1.eample.com Network printer name is stationX and queue type is Generic Text only You can conform the printer setup via URL http://server11.example.com/printers/stationX Here X is your station number

Solution:# yum install system-config-printer* cups* -y# service cups start# system-config-printer new Network printer IPPHost server1.example.comQueue /printers/stationXForward continue anyway -> install Generic forwardPrinter name (station101) forward Print a test page (yes)Set as default (v)

How to check

16. Cron Jobs: Make a schedule task only for user neo (except root) to run the command /bin/echo Hello stationX.example.com at any output terminal at 12:06

Solution:# cat /etc/crontab# crontab –e –u neo 6 12 * * * /bin/echo Hello station101# service crond restart# crontab -l -u Khalid

_____________________________________________________________________For 1 min[root@station101 ~]# ls /dev/pts/0 ptmx[root@station101 ~]# ls -l /dev/pts/0 crw--w----. 1 root tty 136, 0 Sep 26 17:28 /dev/pts/0[root@station101 ~]# chmod o+w /dev/pts/0[root@station101 ~]# ls -l /dev/pts/0 crw--w--w-. 1 root tty 136, 0 Sep 26 17:28 /dev/pts/0

*/1 * * * * /bin/echo Hello > /dev/pts/0\_____________________________________________________________________

17. natasha unable to write crontabSolution:

vim /etc/cron.denyType user name natasha then save & closelogin user crontab -e (Check)

18. To configure ftp service for the network example.com that:Anonymous user can access to your system via ftp within the network example.com

Solution:# yum install vsftpd* -y# chkconfig vsftpd on # service vsftpd start # getsebool –a |grep ftp (SELINUX EFFECT)# setsebool –P ftp_home_dir on# setsebool –P allow_ftpd_anon_write on # getsebool –a |grep ftp (check se effect)# service vsftpd restart

Need to Check

19. To configure apache service for the stationX.example.com that: Download station.html file from ftp://server1.example.com/pub/stationXCopy station.html file into the /var/www/html as index.htmlRemember that you cannot modify this file.Here X is your station number.

Solution:# yum install httpd* -y# chkconfig httpd on# service httpd start# cp /etc/httpd/conf/httpd.conf /etc/httpd/conf/httpd.conf.bac# vim /etc/httpd/conf/httpd.conf: set nuLine 262: Serveradmin root@localhost (if need to change the admin)Line 276: Servername station101.example.com: 80 (uncomment)Save and exit :x# cd /var/www/html# wget ftp://server1.example.com/pub/station107.html # mv station.html index.html# ls –lZ /var/www/html/index.html

httpd_sys_content_t (if show this index then ok)# httpd -t# service httpd restart

To check go to the browser and type station101.example.com

20. When user Robert type, (His password is “password”)dd if=/dev/zero of=file bs=1024 count=70 kb he successeddd if=/dev/zero of=file bs=1024 count=100 kb he failed

Solution:# vim /etc/fstab /home ext3 defaults,usrquota 1 2# mount –o remount,usrquota /home# mount [to show home type ext3 (rw,quota,quota)]# quotacheck –cM /home# chcon –t quota_db_t /home/aquota.user (SELINUX EFECT)# quotaon /home# edquota robart

Blocks soft hard 70 100# repquota –v /home

Testing

21. Configure a system to use an existing LDAP directory service for user and group information.Answer:

# yum install -y openldap nss_ldap# authconfig-tuicheck 'USE LDAP' and 'USE LDAP Authentication'Press 'NEXT'Specify the correct domain settingscheck 'use TLS'server: ldap://192.168.1.254/base DN: dc=domain10,dc=example,dc=comPress 'OK'Then it will ask u for a tls certificate in a location. Remember that location and download certificate file from desired ftp location provided by examiner and put in that location.press 'ok'Testing:# getent passwd (Last line u will see the ldap user with encrypted password)# su - ldapusr

22. Mount ldap user home directory using autofs.Answer:

# yum install autofs* -y# chkconfig autofs on# vi /etc/auto.master /lhome/domain101 /etc/auto.ldap# vi /etc/auto.ldap* -fstype=nfs,rw,soft 192.168.1.201:/lhome/ldap/&# service autofs restartTesting:# su – ldapuser (you will get correct prompt once it is configured correctly.)

Script

23. Write a script in /root/script.sh to give the following outputsample output:

Solution:#/root/script.sh PERLTHIS IS PYTHON#/root/script.sh PYTHONTHIS IS PERL#/root/script.sh/root/script.sh PERL|PYTHON

# vim /root/script.sh

#!/bin/sh

case "$1" in'PERL')

echo "THIS IS PYTHON" ;;

'PYTHON')echo "THIS IS PERL";;

*) echo "usage:$0 PERL|PYTHON"

exit 1 ;;esac

# chmod 775 /root/script.sh (permission)# /root/sctip.sh PERL (check output)# /root/sctip.sh PYTHON (check outpu t)# /root/sctip.sh (check output)

RHCE - Configuration

1. To configure https service for the network example.com that: Configure a https site called wwwX.example.com. Make sure others network cannot access this site.

Solution:# yum install mod_ssl* -y# cd /etc/httpd/conf.d# cp ssl.conf ssl. conf.bak# vim ssl.conf: set nuLine 77: DocumentRoot "/var/www/html" (uncomment)Line 78: ServerName www101.example.com:443 (uncomment & modify)Save and exit :x# service httpd restart

2. To configure apache service for user ruhul. No one can access this web page.Solution:

# vim /etc/httpd/conf/httpd.conf# <Directory> "/var/vhost"

Order deny,allow Deny from all Allow from 172.24.254.50 (User IP)

<Directory>

3. To configure apache service as virtual hosting for the www.X.example.com that: Download www.html file from ftp://server1.example.com /pub/rhel6Copy www.html file into the /var/vhost as index.htmlUser khalid can modify the /var/vhost/index.html file.Here X is your station number

Solution:# mkdir /var/vhost –p# cd /var/vhost# wget ftp://server1.example.com/pub/rhel6/www.html# mv www.html index.html # vim /etc/httpd/conf/httpd.conf: set nu Line 990: NameVirtualHost *:80 (uncomment)Copy 1003 to 1009 (7yy)Paste (p)

<VirtualHost *:80>DocumentRoot /var/www/htmlServerName station101.example.com</VirtualHost>

<VirtualHost *:80>DocumentRoot /var/vhostServerName www101.example.com</VirtualHost>

# chcon –R --reference=/var/www/html /var/vhost# ls –lZ /var/vhost# service httpd restartACL for khalidsetfacel –m u:khalid:rw /var/vhostsetfacel –m u::0 /var/vhost

4. Here example.com or 192.168.1.254 is your trusted network and your system is based on example.com domain there another network mig233.org or 192.168.2.0/24. This network mig233.org or 192.168.2.0 is not trusted.

Solution:# iptables -F# iptables -I INPUT -s 192.168.2.0/24 -j REJECT# iptables –nL (show iptable status)# service iptables save# service iptables restart

5. To configure ssh service for the network example.com that: User khaled can access to your system via ssh with in the network example.com Any user or the network mig233.org can’t access to your system via ssh.

Solution:# yum install openssh* -y# chkconfig sshd on# service sshd start# vim /etc/ssh/sshd_configLine 22 AllowUsers khaled (end of the line)# service sshd restartssh khalid@station101.example.com (check access)

6. To configure Network File Sharing service that: The shared directory /officedata is available for all members of the network example.com The shared directory should available in read and write to all the members of example.com domain.Make sure the network mig233.org can’t access NFS shared directory.

Solution:# vim /etc/exports /officedata *.example.com(rw,sync)Save and exit :x# service rpcbind restart# service nfs restart# showmount -e

Test output

7. To configure samba service for the network example.com that: Samba server workigroup name must be FedoraThe shared directory /officedata as shared name allaccess Only user ruhul can access that directory with password password Only example.com network can access samba shared directory

Solution:# yum install samba* -y# chkconfig smb on # cp /etc/samba/smb.conf /etc/samba/smb.conf.bak# vim /etc/samba/smb.conf

74: workgroup = Fedora (uncomment)79: interfaces = 192.168.1.0/24 (uncomment)Shift+g248: copy 7 lines (7 yy)254: paste (v)254 [allaccess]255 comment = Home Directories256 path = /officedata257 browseable = yes258 writable = yes259 ; valid users = ruhul (keep comment)260 ; valid users = MYDOMAIN\%S (Keep comment)

Save and exit# getsebool -a | grep samba (SELINUX EFFECT)# setsebool –P samba_enable_home_dirs on# setsebool –P samba_export_all_rw on# chcon -t samba_share_t /officedata# ls –lZ /officedata (check selinux)# smbpasswd –a ruhul# service smb start

To check the SAMBA share is working:Open My Computer Edit menu Preference Behavior tab Click the (Always open in browser window)Close and Open again My ComputerType smb://station101.example.com/allowaccess- Username = ruhul- Domain = Fedora (case sensetive)- Password = password

8. Mount an ISO file during startup on /mnt/dvd/iso. ISO file is located at /tmp/xyz.isoSolution:

#mkdir –p /mnt/dev/iso#vi /etc/rc.localmount –o loop /tmp/xyz.iso /mnt/dvd/iso (add this line to rc.local)Save and exit

To mount manually # mount –o loop /tmp/xyz.iso /mnt/dvd/iso#df –h (check)

9. Copy all the lines from /root/worddb.dict files that contains the word "blue" and put those lines in /root/sorted.dict

/root/worddb.dict contains:

The sky is blue.Red cap with blue bubble.Red cad.

solution:#cat /root/worddb.dict | grep -i blue (-i = case insensitive) OR

#cat /root/worddb.dict | grep –i blue > /root/sorted.dict (-i = case insensitive)#cat /root/worddb.dict | grep blue > /root/sorted.dict

Output contains:cat /root/sorted.dict

The sky is blue.Red cap with blue bubble.

10. Create an lv with minimum 50 extend from datavg. The PE is size of the datavg is 16 and mount it on /mnt/dvd/newfs during startup.

Solution:# system-config-lvm# vgdisplay # vgdisplay datavg# lvcreate -l 50 -n datalv /dev/datavg# mkfs.ext4 /dev/datavg/datalv# lvdisplay datalv# lvdisplay /dev/datavg/datalv

11. To configure smtp service for the network example.com that: User ruhul can send or received mail within the network example.com. Make sure any user of the network mig233.org can’t access at 25 port address

Solution:# yum install postfix* -y ----- (Sendmail should be off)# chkconfig postfix on # service postfix start# cp /etc/postfix/main.cf /etc/postfix/main.cf.bac# vim /etc/postfix/main.cf# :set nuGo to the following line and uncomments75: myhostname = station101.example.com (uncomment & type host name)83: mydomain = example.com (uncomment & type domain name)98: myorigin = $myhostname (uncomment)113: inet_interfaces = all (uncomment)116: inet_interfaces = localhost (check uncomment)

119: inet_protocols = all (check uncomment) 164: mydestination = $myhostname, localhost.$mydomain, localhost (check uncomment)

250: mynetworks_style = subnet (uncomment)264: mynetworks = 192.168.1.0/24, 127.0.0.0/8 (uncomment & add ip)Save and exit# service postfix restart

Checking Mail Sending & Receiving # su – ruhul$ mail –v khalid@station107.example.com$ Subject: MSG00$ type something as a body of text.$ .$ su – khaled$ mail (to read mail)

12. To configure pop service for the network example.com that: (Extra)User khalid can retrieve mail from the mail file /var/spool/mail/khalidMake sure any user of the network mig233.org can’t use pop service.

Solution:# yum install dovecot* -y# chkconfig dovecot on# vim /etc/dovecot/dovecot.conf25: protocols = imap pop3 lmtp (uncomment)# vim /etc/dovecot/conf.d/10-mail.conf24: mail_location = maildir:~/if /var/spool/mail (uncomment)25: mail_location = mbox:~/mail:INBOX=/var/mail/%u (uncomment)Save and exit :x# service dovecot restartChecking

# su – ruhul$ mail –v khalid@station107.example.com$ Subject: MSG00$ type something as a body of text.$ .$ su – khaled# mutt -f pop://ruhul@station101.example.com# password# space for show the message

13. To configure any MTA service for the network example.com that: User root can send mail to ruhul user within the network example.comMake sure that the mail of user root should get by the khalid user

Solution:# vim /etc/aliasesEnd of the line (shift+g)root: root,khalidSave and exit :x# newaliases

14. To configure imaps service for the network example.com that:To make a demo certificate,The certificate information is - Organization name: RedHat Inc.- Organization unit name: RHCE- Hostname: stationX.example.com- Email: root@stationX.example.comAnd other information must be default.Here X is your station number

Solution:# yum install make* aide* -y

#find / -name dovecot.pem –exec rm –f {} \;# make -C /etc/pki/tls/certs dovecot.pem

Country Name (2 letter code) [XX]:State or Province Name (full name) []:Locality Name (eg, city) [Default City]:Organization Name (eg, company) [Default Company Ltd]:RedHat Inc.Organizational Unit Name (eg, section) []:RHCECommon Name (eg, your name or your server's hostname) []:station101.example.comEmail Address []:root@station101.example.commake: Leaving directory `/etc/pki/tls/certs'

# cd /etc/dovevot/conf.d# cp 10-ssl.conf 10-ssl.com.bak# vim 10-ssl.conf12: ssl_cert = </ etc/pki/tls/certs/dovecot.pem (Conform this path)13: ssl_key = </ etc/pki/tls/certs/dovecot.pem (Conform this path)

Save and exit :x# service dovecot restart(Checking system)# mutt –f imap://khaled@station101.example.com# y# visual# a (for accept)# passwd

15. Permanent mount ISCSI disk.

#fdisk –l (Remember the current disk status)# yum install iscsi* -y# chkconfig iscsid on# service iscsid start# iscsiadm -m discovery -t st -p 172.16.1.254 (server ip) or# iscsiadm -m discovery -t st -p 172.16.1.254 -l# fdisk –l (to show iscsi status)# service iscsid restart# fdisk –l# create partition & by fdisk # full restart the machine # mkfs.ext4 /dev/sdb1 (format )# mkdir /iscsi (question required)# blkid /dev/sdb1 (show device id)# vim /etc/fstab [UIUD… /iscsi ext4 _netdev 0 0]

16. Find all files of user IRA and put those files /root/findfiles

# find / -user IRA# find / -user IRA -exec cp -rp {} /tmp/collected/ \;# ls -lrt | grep file (check)

17. Modify kernstack value to 1 and it shuld visible by /proc/cmdline # vim /etc/grub.conf # at the end of the kernel line type kernstack=1 # cat /proc/cmdline (to verify whether it shows the parameter) N.B: it will not active until reboot the machine

**Configure apache service that your local system user can only brows your page.**

[root@domain9 vhost]# vim /etc/httpd/conf/httpd.conf<VirtualHost *:80> <Directory "/var/vhost/"> Order deny,allow Deny from all Allow from 172.16.100.9 #your local system IP. </Directory>

ServerAdmin webmaster@example.com DocumentRoot /var/vhost ServerName vhost.example.com ErrorLog logs/www.example.com-error_log CustomLog logs/www.example.com-access_log common</VirtualHost>

#mkdie /var/vhost#chcon -R --reference=/var/www/ /var/vhost

*****************************Testing apache*****************************************

Install elinks#yum install elinks*[root@domain9 vhost]# elinks vhost.example.com[root@domain9 vhost]# elinks www.example.com[root@domain9 vhost]# elinks domain9.example.com

ISCSI**You get a lun as iscsi device from the server host.domain50.example.com , make a file system size 1100Mib and mount itto /mnt/data, download data.txt file from host.domain50.example.com and change the permission of the file that only harryread and write the file. [note. root user always get read write permission]

#yum install iscsi#fdisk -l >> /filesystem.txt

#[root@station5 Desktop]# iscsiadm -m discovery -t st -p 192.168.0.254Starting iscsid: [ OK ]192.168.0.254:3260,1 iqn.2008-09.com.example:server1.station5[root@station5 Desktop]# service iscsi restartStopping iscsi: [ OK ]Starting iscsi: [ OK ][root@station5 Desktop]# chkconfig iscsi on[root@station5 Desktop]# fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes255 heads, 63 sectors/track, 38913 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000207c8

Device Boot Start End Blocks Id System

/dev/sda1 * 1 26 204800 83 LinuxPartition 1 does not end on cylinder boundary./dev/sda2 26 2576 20480000 83 Linux/dev/sda3 2576 4488 15360000 83 Linux/dev/sda4 4488 38914 276525056 5 Extended/dev/sda5 4488 4619 1048576 82 Linux swap / Solaris/dev/sda6 4619 4746 1024000 83 Linux

Disk /dev/sdb: 536 MB, 536870912 bytes17 heads, 61 sectors/track, 1011 cylindersUnits = cylinders of 1037 * 512 = 530944 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table[root@station5 Desktop]# fdisk /dev/sdbDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0xf113fbb0.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u').

Command (m for help): p

Disk /dev/sdb: 536 MB, 536870912 bytes17 heads, 61 sectors/track, 1011 cylindersUnits = cylinders of 1037 * 512 = 530944 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xf113fbb0

Device Boot Start End Blocks Id System

Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1First cylinder (1-1011, default 1): Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-1011, default 1011): Using default value 1011

Command (m for help): p

Disk /dev/sdb: 536 MB, 536870912 bytes17 heads, 61 sectors/track, 1011 cylindersUnits = cylinders of 1037 * 512 = 530944 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0xf113fbb0

Device Boot Start End Blocks Id System/dev/sdb1 1 1011 524173 83 Linux

Command (m for help): wThe partition table has been altered!

Calling ioctl() to re-read partition table.Syncing disks.[root@station5 Desktop]# partprobeWarning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.[root@station5 Desktop]# cd /dev/sdsda sda1 sda2 sda3 sda4 sda5 sda6 sdb sdb1 [root@station5 Desktop]# mkfs.ext4 /dev/sdb1mke2fs 1.41.12 (17-May-2010)Filesystem label=OS type: LinuxBlock size=1024 (log=0)Fragment size=1024 (log=0)Stride=0 blocks, Stripe width=0 blocks131072 inodes, 524172 blocks26208 blocks (5.00%) reserved for the super userFirst data block=1Maximum filesystem blocks=6763315264 block groups8192 blocks per group, 8192 fragments per group2048 inodes per groupSuperblock backups stored on blocks:

8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Writing inode tables: done Creating journal (8192 blocks): doneWriting superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 26 mounts or180 days, whichever comes first. Use tune2fs -c or -i to override.[root@station5 Desktop]# vim /etc/fstab

/dev/sdb1 /mnt/ISCSI5 ext4 _netdev 0 0

[root@station5 Desktop]# mount -a[root@station5 Desktop]# df -hFilesystem Size Used Avail Use% Mounted on/dev/sda3 15G 2.0G 12G 15% /tmpfs 1.4G 260K 1.4G 1% /dev/shm/dev/sda1 194M 26M 159M 14% /boot/dev/sda6 985M 19M 916M 2% /home/dev/sda2 20G 11G 7.9G 57% /var//192.168.122.105/testshare/ 5.8G 2.0G 3.6G 35% /mnt/samba/dev/sdb1 496M 11M 460M 3% /mnt/ISCSI5