RedHat EX200 Red Hat Certified System Administrator -RHCSA Exam Practice Test

fdisk -cu /dev/vda

partx -a /dev/vda

pvcreate /dev/vdax

vgcreate datastore /dev/vdax -s 16M

lvcreate-l 50 -n database datastore

mkfs.ext3 /dev/datastore/database

mkdir /mnt/database

mount /dev/datastore/database /mnt/database/ df -Th

vi /etc/fstab

/dev/datastore /database /mnt/database/ ext3 defaults 0 0 mount -a

*

[shangrila@node1 ~]$ podman ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

d5ffe018a53c registry.domain15.example.com:5000/rhel8/rsyslog:latest /bin/rsyslog.sh 5 seconds ago Up 4 seconds ago logserver

[shangrila@node1 ~]$ podman stats logserver

Error: stats is not supported in rootless mode without cgroups v2

[shangrila@node1 ~]$ podman stop logserver

d5ffe018a53ca7eb075bf560d1f30822ab6fe51eba58fd1a8f370eda79806496

[shangrila@node1 ~]$ podman rm logserver

Error: no container with name or ID logserver found: no such container

[shangrila@node1 ~]$ mkdir -p container-journal/

*

[shangrila@node1 ~]$ sudo systemctl restart systemd-journald

[sudo] password for shangrila:

[shangrila@node1 ~]$ sudo cp -av /var/log/journal/* container-journal/

[shangrila@node1 ~]$ sudo cp -av /var/log/journal/* container-journal/

[shangrila@node1 ~]$ sudo chown -R shangrila container-journal/

[shangrila@node1 ~]$ podman run -d --name logserver -v /home/shangrila/container-journal/:/var/log/journal:Z registry.domain15.example.com:5000/rhel8/rsyslog

[shangrila@node1 ~]$ podman ps

[shangrila@node1 ~]$ loginctl enable-linger

[shangrila@node1 ~]$ loginctl show-user shangrila|grep -i linger

Linger=yes

*

[shangrila@node1 ~]$ podman stop logserver

[shangrila@node1 ~]$ podman rm logserver

[shangrila@node1 ~]$ systemctl --user daemon-reload

[shangrila@node1 ~]$ systemctl --user enable --now container-logserver

[shangrila@node1 ~]$ podman ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

3903e1d09170 registry.domain15.example.com:5000/rhel8/rsyslog:latest /bin/rsyslog.sh 4 seconds ago Up 4 seconds ago logserver

[shangrila@node1 ~]$ systemctl --user stop container-logserver.service

*

[shangrila@node1 ~]$ sudo reboot

[shangrila@node1 ~]$ podman ps -a

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

7e6cd59c506a registry.domain15.example.com:5000/rhel8/rsyslog:latest /bin/rsyslog.sh 10 seconds ago Up 9 seconds ago logserver

# useradd -G admin user2

# useradd -G admin user3

# passwd user2

redhat

# passwd user3

redhat

Using the browser open the URL in the question, download kernel file to root or home directory.

uname –r// check the current kernel version

rpm –ivh kernel-*.rpm

vi /boot/grub.conf// check

Some questions are: Install and upgrade the kernel as required. To ensure that grub2 is the default item for startup.

Yum repo : http://content.example.com/rhel7.0/x86-64/errata

OR

uname -r // check kernel

Yum-config-manager --add-repo=“http://content.example.com/rhel7.0/x86-64/ errata”

Yum clean all

Yum list kernel// install directly

Yum -y install kernel// stuck with it, do not pipe! Please do not pipe!

Default enable new kernel grub2-editenv list// check

Modify grub2-set-default “kernel full name”

Grub2-mkconfig –o/boot/grub2/grub.cfg// Refresh

*

[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

[root@node2 ~]# yum install kmod-kvdo vdo

[root@node2 ~]# systemctl enable --now vdo

[root@node2 ~]# systemctl start vdo

[root@node2 ~]# systemctl status vdo

[root@node2 ~]# vdo create --name=vdo1 --device=/dev/vde --vdoLogicalSize=50G

[root@node2 ~]# vdostats --hu

Device Size Used Available Use% Space saving%

/dev/mapper/vdo1 10.0G 4.0G 6.0G 40% N/A

[root@node2 ~]# mkfs.xfs -K /dev/mapper/vdo1

*

[root@node2 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT

vde 252:64 0 10G 0 disk

└─vdo1 253:4 0 50G 0 vdo

[root@node2 ~]# mkdir /vbread

[root@node2 ~]# blkid

/dev/mapper/vdo1: UUID="1ec7a341-6051-4aed-8a2c-4d2d61833227" BLOCK_SIZE="4096" TYPE="xfs"

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

UUID=1ec7a341-6051-4aed-8a2c-4d2d61833227 /vbread xfs defaults,x-systemd.requires=vdo.service 0 0

[root@node2 ~]# mount /dev/mapper/vdo1 /vbread/

[root@node2 ~]# df -hT

Filesystem Type Size Used Avail Use% Mounted on

/dev/mapper/vdo1 xfs 50G 390M 50G 1% /vbread

# cd /etc/syscofig/network-scripts/

# ls

# vim ifcfg-eth0 (Configure IP Address, Gateway and DNS) IPADDR=172.24.40.40

GATEWAY=172.24.40.1

DNS1=172.24.40.1

# vim /etc/sysconfig/network

(Configure Host Name)

HOSTNAME= station.domain40.example.com

OR

Graphical Interfaces:

System->Preference->Network Connections (Configure IP Address, Gateway and DNS) Vim /etc/sysconfig/network

(Configure Host Name)

fdisk /dev/vda

pvcreate /dev/vda3

vgcreate –s 16M vg0 /dev/vda3

lvcreate –n lv0 –l 20 vg0

mkfs.ext3 /dev/mapper/vg0-lv0

mkdir /data

/etc/fstab:

/dev/mapper/vg0-lv0 /data ext3 defaults 0 0

mount –a

mount | grep data

mkdir/root/findfiles

find / -user jack -exec cp -a {} /root/findfiles/ \; ls /root/findresults

# fdisk /dev/sda

p

(check Partition table)

n

(create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions)

Enter

+2G t

8 I

82

W

partx -a /dev/sda

partprobe

mkswap /dev/sda8

Copy UUID

swapon -a

vim /etc/fstab

UUID=XXXXX swap swap defaults 0 0

(swapon -s)

*

[root@node1 ~]# nmcli connection show

[root@node1 ~]# nmcli connection add con-name static ifname enp1s0 type ethernet ipv4.addresses 172.25.15.10/24 ipv4.gateway 172.25.15.2 ipv4.dns 172.25.15.2

[root@node1 ~]# nmcli connection modify static ipv4.method manual connection.autoconnect yes

[root@node1 ~]# nmcli connection modify static +ipv4.addresses 10.0.0.5/24

[root@node1 ~]# nmcli connection up static

[root@node1 ~]# nmcli connection show

[root@node1 ~]# hostnamectl set-hostname node1.domain15.example.com

[root@node1 ~]# hostnamectl status

[root@node1 ~]# nmcli connection down static

*

[root@node1 ~]# nmcli connection up static

[root@node1 ~]# ip addr show

[root@node1 ~]# reboot

### For checking ###

[root@node1 ~]# ip addr show

[root@node1 ~]# netstat -nr

[root@node1 ~]# cat /etc/resolv.conf

# cd /root; wget ftp://192.168.0.254/pub/boot.iso

# mkdir -p /media/cdrom

# vim /etc/fstab

/root/boot.iso /media/cdrom iso9660 defaults,loop 0 0

# mount -a

mount [-t vfstype] [-o options] device dir

cd;umount /shrink

e2fsck -f /dev/mapper/vgsrv-shrink

resize2fs /dev/mapper/vgsrv-shrink 220M

lvreduce -L 220M /dev/mapper/vgsrv-shrink

mount -a

*

1. Reboot the server pressing by Ctrl+Alt+Del

2. When the boot-loader menu appears, press the cursor keys to highlight the default boot-loader entry

3. Press e to edit the current entry.

4. Use the cursor keys to navigate to the line that starts with linux.

5. Press End to move the cursor to the end of the line.

6. Append rd.break to the end of the line.

7. Press Ctrl+x to boot using the modified configuration.

8. At the switch_root prompt

*

switch_root:/# mount -o remount,rw /sysroot

switch_root:/# chroot /sysroot

sh-4.4# echo kexdrams | passwd --stdin root

Changing password for user root.

passwd: all authentication tokens updated successfully.

sh-4.4# touch /.autorelabel

sh-4.4# exit; exit

*

Type exit twice to continue booting your system as usual.

# 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

cp /etc/fstab /var/tmp

chown root:root /var/tmp/fstab

chmod a-x /var/tmp/fstab

setfacl –m u:mary:rw /var/tmp/fstab

setfacl –m u:alice:rx /var/tmp/fstab

useradd –u 1000 bob

/etc/init.d/rpcbind start

/etc/init.d/nfslock start

/etc/init.d/nfs start

chkconfig rpcbind on

chkconfig nfslock on

chkconfig nfs on

showmount -e localhost

[root@node2 ~]# tuned-adm list

[root@node2 ~]# tuned-adm active

Current active profile: virtual-guest

[root@node2 ~]# tuned-adm recommend

virtual-guest

[root@node2 ~]# tuned-adm profile virtual-guest

[root@node2 ~]# tuned-adm active

Current active profile: virtual-guest

[root@node2 ~]# reboot

[root@node2 ~]# tuned-adm active

Current active profile: virtual-guest

vim/etc/yum.repos/base.repo

[base]

name=base

baseurl= http://server.domain11.example.com/pub/x86_64/Server

gpgcheck=0

enable=1

Save and Exit

Use yum list for validation, the configuration is correct if list the package information. If the Yum configuration is not correct then maybe cannot answer the following questions.

groupadd admin

useradd -G admin mary

useradd -G admin alice

useradd -s /sbin/nologin bobby

echo "password" | passwd --stdin mary

echo "password" | passwd --stdin alice

echo "password" | passwd --stdin bobby

By default, system accept the logs only generated from local host. To accept the Log from other host configure:

vi /etc/sysconfig/syslog SYSLOGD_OPTIONS="-m 0 -r"

Where

-m 0 disables 'MARK' messages.

-r enables logging from remote machines

-x disables DNS lookups on messages received with -r

service syslog restart