its about RHCE & RHCSA

1. Redhat Certified System
Administration (RHCSA)
&
Redhat Certified
Engineer(RHCE)

2. Hardware requirement for RHEL6
Installation
• 64-bit system
• Ram requirement
• Hard Drive
• CDROM Drive

3. Basic commands in RHCE6
• pwd
• cd
• ls
• ls –l
• vi
• cat
• rm
• mkdir
• rmdir
• more & less
• head
• tail
• logout
• init 0
• exit
• clear
• sudo
• gedit
• reboot
• man

4. USERADD
1. /etc/passwd
2. /etc/shadow
3. /etc/gshadow
4. /etc/group
5. /etc/spool/mail
6. /etc/home

5. Description
R Read
W Write
X Execute
S Set user or group ID on execution
U Permission granted to user who owns the file
G Permission granted to user in the file’s group
O permission granted to other user

6. Digits permission
0 none
1 execute
2 write
4 read
3(1+2) write and execute
5(1+4) read and execute
7(1+2+4) read, write and execute

7. RPM in Linux
1. rpm –q <package name>
2. Rpm –qa
3. Rpm –ivh foo-1.0-1.i386.rpm
4. Rpm –e foo
5. Rpm –Uvh foo-2.0.1.i386.rpm

8. Linux ACL
Categories of ACLs per file
1. For an individual user
2. For a user group
3. Via the effective rights mask
4. For users not in the user group associated
with file.

9. File system Administration
Useful commands for file system
1. Df –h
2. Du
3. Mount
4. umount
5. Fdisk –l
6. Fdisk /dev/sda
7. Mkfs –t ext4 /dev/sda6
8. fstab

10. Create Swap partition
• Fdisk /dev/sda
• Reboot –f
• Mkswap /dev/sda6
• Swapon /dev/sda
• Fstab

11. LVM(logical volume management
For step for create a LVM
1. Create PV
2. Create VG
3. Create LVM
4. Format LVM & mount it

12. Basic commands for LVM
1. Pvcreate
2. Pvdisplay
3. Vgcreate
4. Vgdisplay
5. Lvcreate
6. mkfs.ext4 /dev/vol1/lv1

13. Extend LVM
• Lvextend +60MB /dev/vol0/lv1
• Resize2fs /dev/vol0/lv1

14. Reduce LVM size
• Umount
• E2fsck –f /dev/vol0/lv1
• resize2fs /dev/vol0/lv1 60MB
• Lvreduce 60MB /dev/vol0/lv1
• mount

15. KERNEL and GRUB
“kernel is the core part of any operating system
which allows every activity which is going to
occur in your operation system”
* Command for kernel version-
Uname –r
o/p
2.6.22-14-generic

16. servers
i. TELNET
ii. SSH
iii. FTP
iv. NIS
v. NFS
vi. SAMBA
vii. NTP
viii. DNS

17. Configure Telnet server
1 . Server side
• Install Telnet server software
• Configure
• Service xinetd restart
• Security
Setenforce 0
Iptables –f
2. Client side
* telnet <server ip>

18. Configure SSH Server
1. Server side
• Install SSH server software
• Configure SSH server
• Service sshd restart
• Security
Setenforce 0
Iptables –f
2. Client side
* Ssh <server ip>

19. Configure FTP server
1. server side
• Install FTP server software
• Configure FTP server
• Service vsftpd restart
• Security
Setenforce 0
Iptables –f
2. Client side
* Software install
* ftp <server ip>

20. Configure NIS Server
1. Server side
install ypserv software
Configure NiS server
service ypserv restart
2. Client side
install ypbind software
run setup command

21. Configure NFS server
1. Server side
install nfs –utis software
configure server
service nfs restart
2. Client side
mount <server ip> : /movies /media/abc

22. Configure SAMBA server
1. Server side
install samba software
configure samba
service smb restart
2. Client side
install sambaclient software
mount <server ip> : /movies /media/abc