EX200 Questions and Answers

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[root@workstation ~]# ssh shangrila@node1

[shangrila@node1 ~]$ podman login registry.domain15.example.com:5000

Username: admin

Password:

Login Succeeded!

[shangrila@node1 ~]$ podman pull registry.domain15.example.com:5000/rhel8/rsyslog

[shangrila@node1 ~]$ podman run -d --name logserver registry.domain15.example.com:5000/rhel8/rsyslog

021b26669f39cc42b8e94eab886ba8293d6247bf68e4b0d76db2874aef284d6d

[shangrila@node1 ~]$ mkdir -p ~/.config/systemd/user

[shangrila@node1 ~]$ cd ~/.config/systemd/user

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[shangrila@node1 user]$ podman generate systemd --name logserver --files --new

/home/shangrila/.config/systemd/user/container-logserver.service

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

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

[shangrila@node1 ~]$ podman ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

7d9f7a8a4d63 registry.domain15.example.com:5000/rhel8/rsyslog:latest /bin/rsyslog.sh 2 seconds ago logserver

[shangrila@node1 ~]$ sudo reboot

[shangrila@node1 ~]$ cd .config/systemd/user

[shangrila@node1 user]$ systemctl --user status

# 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

l

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)

mkdir/root/findfiles

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

# vim /boot/grub/grub.conf

kernel/vmlinuz-2.6.32-71.el6.x86_64 ro root=/dev/mapper/GLSvg-GLSrootrd_LVM_LV=GLSvg/GLSroot

rd_LVM_LV=GLSvg/GLSswaprd_NO_LUKSrd_NO_MDrd_NO_DM

LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet kmcrl=5

Restart to take effect and verification:

# cat /proc/cmdline

ro root=/dev/mapper/GLSvg-GLSroot rd_LVM_LV=GLSvg/GLSroot rd_LVM_LV=GLSvg/GLSswap rd_NO_LUKS rd_NO_MD rd_NO_DM

LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet kmcrl=5

Download the file to /tmp first

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

• useradd -u 3400 alex
• passwd alex
• su -alex

• vi /etc/resolv.conf

nameserver 172.24.254.254

• host server1.example.com

On every clients, DNS server is specified in /etc/resolv.conf. When you request by name it tries to resolv from DNS server.

[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

df -hT

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

lvscan

xfs_growfs /home/ // home is LVM mounted directory

Note: This step is only need to do in our practice environment, you do not need to do in the real exam

resize2fs /dev/vg0/vo // Use this comand to update in the real exam df -hT

OR

e2fsck -f/dev/vg0/vo

umount /home

resize2fs /dev/vg0/vo required partition capacity such as 100M lvreduce -l 100M /dev/vg0/vo mount /dev/vg0/vo /home

df –Ht

• groupadd sysmgrs
• useradd -G sysmgrs Natasha

• We can verify the newly created user by cat /etc/passwd)

# useradd -G sysmgrs harry

# useradd -s /sbin/nologin sarrh

# passwd Natasha

# passwd harry

# passwd sarrah

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.

# useradd -G admin user2

# useradd -G admin user3

# passwd user2

redhat

# passwd user3

redhat

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

Key.

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

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

vi /etc/fstab

Write:

/dev/hda? /data ext3 defaults 1 2

Verify by mounting on current Sessions also: mount /dev/hda? /data

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[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

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[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"

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[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

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