CertBus 2021 Valid RedHat EX200 RHCSA Exam VCE and PDF Dumps for Free Download!

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Question 1:

Configure a cron Task.

User natasha must configure a cron job, local time 14:23 runs and executes: */bin/echo hiya every day.

Correct Answer: Check the anser in explanation.

crontab –e –u natasha 23 14/bin/echo hiya crontab -l -u natasha // view systemctlenable crond systemcdlrestart crond

Question 2:

According the following requirements to create user, user group and the group members:

-A group named admin.

–

A user named mary, and belong to admin as the secondary group.

–

A user named alice, and belong to admin as the secondary group.

–

A user named bobby, bobby’s login shell should be non-interactive. Bobby not belong to admin as the secondary group. Mary, Alice, bobby users must be set “password” as the user\’s password.

Correct Answer: Check the anser in explanation.

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

Question 3:

Configure /var/tmp/fstab Permission. Copy the file /etc/fstab to /var/tmp/fstab. Configure var/tmp/fstab permissions as the following: Owner of the file /var/tmp/fstab is Root, belongs to group root File /var/tmp/fstab cannot be executed by any user User natasha can read and write /var/tmp/fstab User harry cannot read and write /var/tmp/fstab All other users (present and future) can read var/tmp/fstab.

Correct Answer: Check the anser in explanation.

cp /etc/fstab /var/tmp/

/var/tmp/fstab view the owner setfacl -m u:natasha:rw- /var/tmp/fstab setfacl -m u:haryy:— /var/tmp/fstab Use getfacl /var/tmp/fstab to view permissions

Question 4:

Please open the ip_forward, and take effect permanently.

Correct Answer: Check the anser in explanation.

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

Question 5:

According the following requirements, configure autofs service and automatically mount to user\’s home directory in the ldap domain.

–

Instructor.example.com (192.168.0.254) has shared /home/guests/ldapuserX home directory to your system by over NFS export, X is your hostname number.

–

LdapuserX\’s home directory is exist in the instructor.example.com: /home/ guests/ldapuserX

–

LdapuserX’s home directory must be able to automatically mount to /home/ guests/ldapuserX in your system.

–

Home directory have write permissions for the corresponding user.

However, you can log on to the ldapuser1 – ldapuser99 users after verification. But you can only get your corresponding ldapuser users. If your system\’s hostname is server1.example.com, you can only get ldapuser1\’s home directory.

Correct Answer: Check the anser in explanation.

mkdir –p /home/guests cat /etc/auto.master: /home/guests /etc/auto.ldap cat /etc/auto.ldap: ldapuser1 -rw instructor.example.com:/home/guests/ldapuser1

automatically mount all the user\’s home directory #* -rw instructor.example.com:/home/guests/and

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Question 6:

Search a String

Find out all the columns that contains the string seismic within /usr/share/dict/words, then copy all these columns to /root/lines.tx in original order, there is no blank line, all columns must be the accurate copy of the original columns.

Correct Answer: Check the anser in explanation.

grep seismic /usr/share/dict/words> /root/lines.txt

Question 7:

Update the kernel from ftp://instructor.example.com/pub/updates. According the following requirements:

The updated kernel must exist as default kernel after rebooting the system.

The original kernel still exists and is available in the system.

Correct Answer: Check the anser in explanation.

rpm -ivh kernel-firm… rpm -ivh kernel…

Question 8:

Configure a task: plan to run echo “file” command at 14:23 every day.

Correct Answer: Check the anser in explanation.

(a) Created as administrator # crontab -u natasha -e 23 14 * * * /bin/echo “file” (b)Created as natasha # su – natasha $ crontab -e 23 14 * * * /bin/echo “file”

Question 9:

Locate all the files owned by ira and copy them to the / root/findresults directory.

Correct Answer: Check the anser in explanation.

# find / -user ira > /root/findresults (if /root/findfiles is a file) # mkdir -p /root/findresults # find / -user ira -exec cp -a {} /root/findresults\; [ if /root/findfiles is a directory] ls /root/findresults

Question 10:

Install the Kernel Upgrade.

Install suitable kernel update from:

http://server.domain11.example.com/pub/updates.

Following requirements must be met:

Updated kernel used as the default kernel of system start-up.

The original kernel is still valid and can be guided when system starts up.

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

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