EX200 Red Hat Certified System Administrator - RHCSA (8.2) Questions and Answers

nameserver is specified in question,

1. Vi /etc/resolv.conf

nameserver 192.168.0.254

2. host server1.example.com

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

Addition

df -hT

lvextend -L +100M /dev/vg0/vo

Lvscan

xfs_growfs /home/ //home is the mounted directory of the LVM, this step just need to do in the practice environment, and test EXT4 does not need this step.

resize2fs /dev/vg0/vo// use this command to update in examination.

df -hT

OR

Subtraction

e2fsck -f/dev/vg0/vo

umount /home

resize2fs /dev/vg0/vo // the final required partition capacity is 100M lvreduce -l 100M /dev/vg0/vo

mount /dev/vg0/vo/home

df -hT

• 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.

yum install vsftpd

/etc/init.d/vsftpd start

chkconfig vsftpd on

# cd /opt/

# mkdir dir

# find / -user harry -exec cp -rfp {} /opt/dir/ \;

*

[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@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vdc 252:32 0 5G 0 disk

└─vdc1 252:33 0 4.1G 0 part

└─datavg-datalv 253:3 0 3.9G 0 lvm /data

vdd 252:48 0 5G 0 disk

vde 252:64 0 10G 0 disk

[root@node2 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2097148 1548 -2

[root@node2 ~]# free -m

total used free shared buff/cache available

Mem: 1816 1078 104 13 633 573

Swap: 2047 1 2046

[root@node2 ~]# parted /dev/vdc print

Number Start End Size Type File system Flags

1 1049kB 4404MB 4403MB primary lvm

*

[root@node2 ~]# parted /dev/vdc mkpart primary linux-swap 4404MiB 5060MiB

[root@node2 ~]# mkswap /dev/vdc2

Setting up swapspace version 1, size = 656 MiB (687861760 bytes)

no label, UUID=9faf818f-f070-4416-82b2-21a41988a9a7

[root@node2 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2097148 1804 -2

[root@node2 ~]# swapon /dev/vdc2

*

[root@node2 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2097148 1804 -2

/dev/vdc2 partition 671740 0 -3

[root@node2 ~]# blkid

/dev/vdc2: UUID="9faf818f-f070-4416-82b2-21a41988a9a7" TYPE="swap" PARTUUID="0f22a35f-02"

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

UUID=9faf818f-f070-4416-82b2-21a41988a9a7 swap swap defaults 0 0

[root@node2 ~]# reboot

[root@node2 ~]# swapon -s

Filename Type Size Used Priority

/dev/dm-1 partition 2097148 1804 -2

/dev/vdc2 partition 671740 0 -3

# useradd -u 1234 alex

# passwd alex

alex111

alex111

OR

echo alex111|passwd -stdin alex

mkdir /home/admins

chgrp -R adminuser /home/admins

chmodg+w /home/admins

chmodg+s /home/admins

*

[root@node1 ~]# cat /etc/passwd | grep nologin > /root/strings

[root@node1 ~]# cat /root/strings

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

• ftp server.domain11.example.com Anonymous login

ftp> cd /pub/updates ftp> ls

ftp> mget kernel* ftp> bye

• rpm -ivh kernel*
• vim /etc/grub.conf

Check the updatted kernel is the first kernel and the orginal kernel remains available. set default=0

wq!

1. Use fdisk /dev/hda-> To create new partition.

2. Type n ->For New partitions

3. It will ask for Logical or Primary Partitions. Press l for logical.

4. It will ask for the Starting Cylinder: Use the Default by pressing Enter

Keys

5. Type the size: +100M you can specify either Last cylinder of size here.

6. Press P to verify the partitions lists and remember the partitions name.

7. Press w to write on partitions table.

8. Either Reboot or use partprobe command.

9. Use mkfs -t ext3 /dev/hda?

OR

1. mke2fs -j /dev/hda? ->To create ext3 filesystem.

2. vi /etc/fstab

3. Write:

/dev/hda? /data ext3 defaults 0 0

4. Verify by mounting on current sessions also:

mount /dev/hda? /data

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

# pvcreate /dev/sda7 /dev/sda8

# vgcreate -s 16M vg1 /dev/sda7 /dev/sda8

# lvcreate -l 50 -n lvm02

# mkfs.ext4 /dev/vg1/lvm02

# blkid /dev/vg1/lv1

# vim /etc/fstab

# mkdir -p /mnt/data

UUID=xxxxxxxx /mnt/data ext4 defaults 0 0

# vim /etc/fstab

# mount -a

# mount

(Verify)

*

[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

#system-config-date

Note: dialog box will open in that

Check mark Synchronize date and time over network. Remove all the NTP SERVER and click ADD and type

server.domain11.example.com

****************And then press ENTER and the press OK***************