EX200 Online Practice Questions and Answers

Correct Answer: Check the anser in explanation.

useradd eric

passwd eric

vi /etc/passwd

eric:x:505:505::/home/eric:/sbin/nologin

Which shell or program should start at login time is specified in /etc/passwd file? By default, Redhat Enterprise Linux assigns the /bin/bash shell to the users. To deny the interactive login, you should write /sbin/nologin or /bin/ false instead of login shell.

Correct Answer: Check the anser in explanation.

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.

Correct Answer: Check the anser in explanation.

iptables -F service iptables save iptables -A INPUT -s 172.25.0.0/16 -j REJECT service iptables save service iptables restart

Correct Answer: Check the anser in explanation.

chmod 770 /archive

Verify using : ls -ld /archive Preview should be like: drwxrwx--- 2 root sysuser 4096 Mar 16 18:08 /archive To change the permission on directory we use the chmod command. According to the question that only the owner user (root) and group member (sysuser) can fully access the directory so: chmod 770 /archive

Correct Answer: Check the anser in explanation.

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

Correct Answer: Check the anser in explanation.

# 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

Correct Answer: Check the anser in explanation.

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

Correct Answer: Check the anser in explanation.

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

Type n-> For New partition

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

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

Type the Size: +100M ->You can Specify either Last cylinder of Size here.

Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that

means Linux Native.

Type t to change the System ID of partition.

Type Partition Number

Type 82 that means Linux Swap.

Press w to write on partitions table.

Either Reboot or use partprobe command.

mkswap /dev/hda? ->To create Swap File system on partition.

swapon /dev/hda? ->To enable the Swap space from partition.

free -m ->Verify Either Swap is enabled or not.

vi /etc/fstab/dev/hda? swap swap defaults 0 0

Reboot the System and verify that swap is automatically enabled or not.

Correct Answer: Check the anser in explanation.

# cp /etc/fstab /var/tmp/ # chgrp admin /var/tmp/fstab # setfacl -m u:user1:rwx /var/tmp/fstab # setfacl -m u:user2:--- /var/tmp/fstab # ls -l -rw-rw-r--+ 1 root admin 685 Nov 10 15:29 /var/tmp/fstab

Correct Answer: Check the anser in explanation.

* [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