cd /var/www/html

wget http://instructor.example.com/pub/serverX.html mv serverX.html index.html /etc/init.d/httpd restart

chkconfig httpd on

The LVM system organizes hard disks into Logical Volume (LV) groups. Essentially, physical hard disk partitions (or possibly RAID arrays) are set up in a bunch of equal sized chunks known as Physical Extents (PE). As there are several other concepts associated with the LVM system, let's start with some basic definitions:

Physical Volume (PV) is the standard partition that you add to the LVM mix. Normally, a physical volume is a standard primary or logical partition. It can also be a RAID array.

Physical Extent (PE) is a chunk of disk space. Every PV is divided into a number of equal sized PEs. Every PE in a LV group is the same size. Different LV groups can have different sized PEs.

Logical Extent (LE) is also a chunk of disk space. Every LE is mapped to a specific PE.

Logical Volume (LV) is composed of a group of LEs. You can mount a file system such as /home and /var on an LV.

Volume Group (VG) is composed of a group of LVs. It is the organizational group for LVM. Most of the commands that you'll use apply to a specific VG.

• Verify the size of Logical Volume: lvdisplay /dev/vg0/lv1
• Verify the Size on mounted directory: df -h or df -h mounted directory name
• Use: lvextend -L+400M /dev/vg0/lv1
• ext2online -d /dev/vg0/lv1 to bring extended size online.
• Again Verify using lvdisplay and df -h command.

yum -y install sssd authconfig-gtk krb5-workstation authconfig-gtk // open the graphical interface

Modify user account database to ldap, fill up DN and LDAP SERVER as questions required, use TLS to encrypt connections making tick, write http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to download ca, authentication method choose ldap password.

You can test if the ldapuser is added by the following command:

Id ldapuser1

Note: user password doesn’t not need to set

• lvextend -L+200M /dev/test0/testvolume1 Use lvdisplay /dev/test0/testvolume1)
• ext2online -d /dev/test0/testvolume1

lvextend command is used the increase the size of Logical Volume. Other command lvresize command also here to resize. And to bring increased size on online we use the ext2online command.

• use the authconfig --nisserver= --nisdomain= -- update

Example: authconfig --niserver=192.168.0.254 --nisdomain=RHCE --update or system-config-authentication

• Click on Enable NIS
• Type the NIS Domain: RHCE
• Type Server 192.168.0.254 then click on next and ok
• You will get a ok message.
• Create a Directory /rhome/stationx where x is your station number.

• vi /etc/auto.master and write at the end of file /rhome/stationx /etc/auto.home --timeout=60
• vi /etc/auto.home and write

* -rw,soft,intr 192.168.0.254:/rhome/stationx/&

Note: please specify your station number in the place of x.

• Service autofs restart
• Login as the nisuser2001 or nisuser2002 on another terminal will be Success. According to question, RHCE domain is already configured. We have to make a client of RHCE domain and automatically mount the home directory on your system. To make a member of domain, we use the authconfig with option or system-config authentication command. There a are lots of authentication server i.e NIS, LDAB, SMB etc. NIS is a RPC related Services, no need to configure the DNS, we should specify the NIS server address.

Here Automount feature is available. When user tried to login, home directory will automatically mount. The automount service used the /etc/auto.master file. On

/etc/auto.master file we specified the mount point the configuration file for mount point.

*

[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

└─vdo1 253:4 0 50G 0 vdo /vbread

[root@node2 ~]# yum install stratis* -y

[root@node2 ~]# systemctl enable --now stratisd.service

[root@node2 ~]# systemctl start stratisd.service

[root@node2 ~]# systemctl status stratisd.service

[root@node2 ~]# stratis pool create think_pool /dev/vdd

[root@node2 ~]# stratis pool list

Name Total Physical Properties

think_pool 5 GiB / 37.63 MiB / 4.96 GiB ~Ca,~Cr

*

[root@node2 ~]# stratis filesystem create think_pool think_fs

[root@node2 ~]# stratis filesystem list

Pool Name Name Used Created Device UUID

think_pool think_fs 546 MiB Mar 23 2021 08:21 /stratis/think_pool/think_fs ade6fdaab06449109540c2f3fdb9417d

[root@node2 ~]# mkdir /strav

[root@node2 ~]# lsblk

[root@node2 ~]# blkid

/dev/mapper/stratis-1-91ab9faf36a540f49923321ba1c5e40d-thin-fs-ade6fdaab06449109540c2f3fdb9417d: UUID="ade6fdaa-b064-4910-9540-c2f3fdb9417d" BLOCK_SIZE="512" TYPE="xfs"

*

[root@node2 ~]# vim /etc/fstab

UUID=ade6fdaa-b064-4910-9540-c2f3fdb9417d /strav xfs defaults,x-systemd.requires=stratisd.service 0 0

[root@node2 ~]# mount /stratis/think_pool/think_fs /strav/

[root@node2 ~]# df -hT

/dev/mapper/stratis-1-91ab9faf36a540f49923321ba1c5e40d-thin-fs-ade6fdaab06449109540c2f3fdb9417d xfs 1.0T 7.2G 1017G 1% /strav

# chkconfig autofs on

# cd /etc/

# vim /etc/auto.master

/rhome /etc/auto.ldap

# cp auto.misc auto.ldap

# vim auto.ladp

ldapuser40 -rw,soft,intr 172.24.40.10:/rhome/ldapuser40

* -rw,soft,intr 172.16.40.10:/rhome/&

# service autofs stop

# server autofs start

# showmount -e 172.24.40.10

# su - ladpuser40

Download the new kernel file and then install it.

[root@desktop8 Desktop]# ls

kernel-2.6.32-71.7.1.el6.x86_64.rpm

kernel-firmware-2.6.32-71.7.1.el6.noarch.rpm

[root@desktop8 Desktop]# rpm -ivh kernel-*

Preparing... ###########################################

[100%]

1:kernel-firmware

########################################### [ 50%]

2:kernel

########################################### [100%]

Verify the grub.conf file, whether use the new kernel as the default boot. [root@desktop8 Desktop]# cat /boot/grub/grub.conf default=0

title Red Hat Enterprise Linux Server (2.6.32-71.7.1.el6.x86_64)

root (hd0,0)

kernel /vmlinuz-2.6.32-71.7.1.el6.x86_64 ro root=/dev/mapper/vol0-root rd_LVM_LV=vol0/root rd_NO_LUKS rd_NO_MD

rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet

initrd /initramfs-2.6.32-71.7.1.el6.x86_64.img

lvextend -L 190M /dev/mapper/vgsrv-common resize2fs /dev/mapper/vgsrv-common

*

[root@node1 ~]# cp -p /etc/fstab /var/tmp/

[root@node1 ~]# ls -lrt /etc/fstab

[root@node1 ~]# ls -lrt /var/tmp/fstab

[root@node1 ~]# chmod a+x /var/tmp/fstab

[root@node1 ~]# getfacl /var/tmp/fstab

[root@node1 ~]# setfacl -m u:harry:rw- /var/tmp/fstab

[root@node1 ~]# setfacl -m u:natasha:--- /var/tmp/fstab

[root@node1 ~]# getfacl /var/tmp/fstab

getfacl: Removing leading '/' from absolute path names

# file: var/tmp/fstab

# owner: root

# group: root

user::rwx

user:harry:rw-

user:natasha:---

group::r-x

mask::rwx

other::r-x

*

[root@node1 ~]# su - natasha

[natasha@node1 ~]$ cat /var/tmp/fstab

cat: /var/tmp/fstab: Permission denied

# which echo

# crontab -e

23 14 * * * /bin/echo hello

# crontab -l (Verify)

yum install vsftpd

/etc/init.d/vsftpd start

chkconfig vsftpd on

mkdir /home/admins

chgrp -R adminuser /home/admins

chmodg+w /home/admins

chmodg+s /home/admins

groupadd adminuser

useradd natasha -G adminuser

useradd haryy -G adminuser

useradd sarah -s /sbin/nologin

Passwd user name // to modify password or echo redhat | passwd --stdin user name id natasha // to view user group.

• echo "1" >/proc/sys/net/ipv4/ip_forward
• vi /etc/sysctl.conf

net.ipv4.ip_forward = 1

If you want to use the Linux System as a Router to make communication between different networks, you need enable the IP forwarding. To enable on running session just set value 1 to

/proc/sys/net/ipv4/ip_forward. As well as automatically turn on the IP forwarding features on next boot set on /etc/sysctl.conf file.

*

[root@node1 ~]# tar cvf /root/backup.tar /usr/local/

tar: Removing leading `/' from member names

/usr/local/

/usr/local/bin/

/usr/local/etc/

[root@node1 ~]# ls

backup.tar

[root@node1 ~]# file backup.tar

backup.tar: POSIX tar archive (GNU)

[root@node1 ~]# bzip2 backup.tar

[root@node1 ~]# ls

backup.tar.bz2

[root@node1 ~]# file backup.tar.bz2

backup.tar.bz2: bzip2 compressed data, block size = 900k

•

[root@node1 ~]# sestatus

SELinux status: enabled

[root@node1 ~]# cat /etc/selinux/config

SELINUX=enforcing

SELINUXTYPE=targeted

[root@node1 ~]# reboot

### For Checking ###

[root@node1 ~]# sestatus

SELinux status: enabled

* [root@node1 ~]# groupadd sharegrp

[root@node1 ~]# useradd harry

[root@node1 ~]# useradd natasha

[root@node1 ~]# usermod -aG sharegrp harry

[root@node1 ~]# usermod -aG sharegrp natasha

[root@node1 ~]# useradd -s /sbin/nologin copper

[root@node1 ~]# echo "redhat" | passwd --stdin harry

[root@node1 ~]# echo "redhat" | passwd --stdin natasha

[root@node1 ~]# echo "redhat" | passwd --stdin copper

### For Checking ###

[root@node1 ~]# su - copper

This account is currently not available.

[root@node1 ~]# su - natasha

[root@node1 ~]# id

[root@node1 ~]# su - harry

[root@node1 ~]# id