EX200 Red Hat Certified System Administrator -RHCSA Questions and Answers

[root@node1 ~]# find / -name natasha -type f > /home/natasha/files

[root@node1 ~]# cat /home/natasha/files

/var/spool/mail/natasha

/mnt/shares/natasha

[root@node1 ~]# mkdir /find

[root@node1 ~]# find /etc -size +5M > /find/largefiles

[root@node1 ~]# cat /find/largefiles

/etc/selinux/targeted/policy/policy.31

/etc/udev/hwdb.bin

*

[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdb 252:16 0 5G 0 disk

└─vdb1 252:17 0 4.2G 0 part

└─vgrz-lvrz 253:2 0 4.1G 0 lvm /datarz

vdc 252:32 0 5G 0 disk

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# parted /dev/vdc mklabel msdos

[root@node2 ~]# parted /dev/vdc mkpart primary 1MiB 4200MiB

[root@node2 ~]# parted /dev/vdc set 1 lvm on

*

[root@node2 ~]# udevadm settle

[root@node2 ~]# pvcreate /dev/vdc1

Physical volume "/dev/vdc1" successfully created.

[root@node2 ~]# vgcreate -s 16M datavg /dev/vdc1

Volume group "datavg" successfully created

[root@node2 ~]# lvcreate -n datalv -L 4000M datavg

Logical volume "datalv" created.

[root@node2 ~]# mkfs.xfs /dev/datavg/datalv

[root@node2 ~]# mkdir /data

[root@node2 ~]# blkid

/dev/mapper/datavg-datalv: UUID="7397a292-d67d-4632-941e-382e2bd922ce" BLOCK_SIZE="512" TYPE="xfs"

*

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

UUID=7397a292-d67d-4632-941e-382e2bd922ce /data xfs defaults 0 0

[root@node2 ~]# mount UUID=7397a292-d67d-4632-941e-382e2bd922ce /data

[root@node2 ~]# reboot

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/datavg-datalv xfs 3.9G 61M 3.9G 2% /data

# useradd -u 601 -s /sbin/nologin user1

# passwd user1

redhat

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

• sysctl –w (takes effect immediately)

If no “sysctl.conf” option, use these commands:

• sysctl –a |grep net.ipv4
• sysctl –P net.ipv4.ip_forward = 1
• sysctl -w

[root@node1 ~]# vim /etc/yum.repos.d/redhat.repo

[BaseOS]

name=BaseOS

baseurl=http://utility.domain15.example.com/BaseOS

enabled=1

gpgcheck=1

gpgkey=http://utility.domain15.example.com/RPM-GPG-KEY-redhat-release

[AppStream]

name=AppStream

baseurl=http://utility.domain15.example.com/AppStream

enabled=1

gpgcheck=1

gpgkey=http://utility.domain15.example.com/RPM-GPG-KEY-redhat-release

[root@node1 ~]# yum clean all

[root@node1 ~]# yum repolist

repo id repo name

AppStream AppStream

BaseOS BaseOS

[root@node1 ~]# yum list all

Download the file to /tmp first

grep [abcde] /tmp/testfile > /mnt/answer

* root@node1 ~]# find / -user alex -type f > /home/alex/files

• rpm -ivh ftp://server1/example.com/pub/updates/zsh-*

or

• Login to ftp server : ftp ftp://server1.example.com using anonymous user.
• Change the directory: cd pub and cd updates
• Download the package: mget zsh-*
• Quit from the ftp prompt : bye
• Install the package
• rpm -ivh zsh-*
• Verify either package is installed or not : rpm -q zsh

system-config-date &

# cat /etc/grub.conf

# cd /boot

# lftp it

# get dr/dom/kernel-xxxx.rpm

# rpm -ivh kernel-xxxx.rpm

# vim /etc/grub.conf

default=0

1. vi /etc/auto.master

/mnt /etc /auto.misc --timeout=50

• vi /etc/auto.misc
• data -rw,soft,intr server1.example.com:/data
• service autofs restart
• chkconfig autofs on

When you mount the other filesystem, you should unmount the mounted filesystem, Automount feature of linux helps to mount at access time and after certain seconds, when user unaccess the mounted directory, automatically unmount the filesystem.

/etc/auto.master is the master configuration file for autofs service. When you start the service, it reads the mount point as defined in /etc/auto.master.

• Create a partition having size 5 GB and change the syste id '8e'.
• use partprobe command
• pvcreate /dev/hda9 Suppose your partition number is hda9.
• vgextend test0 /dev/hda9 vgextend command add the physical disk on volume group.
• lvextend -L+5120M /dev/test0/lvtestvolume
• verify using lvdisplay /dev/test0/lvtestvolume.

# fdisk /dev/vda

n

+512M

w

# partprobe /dev/vda

# mkfs -t ext4 /dev/vda5

# mkdir -p /data

# vim /etc/fstab

/dev/vda5 /data ext4 defaults 0 0

# mount -a

cd /usr/local

tar –jcvf /root/backup.tar.bz2

mkdir /test

tar –jxvf /root/backup.tar.bz2 –C /test// Decompression to check the content is the same as the /usr/loca after

If the questions require to use gzip to compress. change –j to –z.

cd /usr/local

tar -jcvf /root/backup.tar.bz2*

mkdir /test

tar -jxvf /root/backup.tar.bz2 -C /test/

fdisk -cu /dev/vda// in the way of expanding the partition, don’t make main partition

partx –a /dev/vda

mkswap /dev/vdax

swapon /dev/vdax

swapon –s

vi /etc/fstab

/dev/vdaxswapswapdefaults0 0

mount -a