EX200 Online Practice Questions and Answers

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/etc/sysconfig/selinux SELINUX=enforcing

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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.

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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

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Yum-config-manager --add-repo=http://content.example.com/rhel7.0/x86-64/dvd” is to generate a file vim content.example.com_rhel7.0_x86_64_dvd.repo, Add a line gpgcheck=0 Yumcleanall Yumrepolist Almost 4305 packages are right, Wrong Yum Configuration will lead to some following questions cannot be worked out.

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Configure the client: Yum -y install chrony Vim /etc/chrony.conf Add: server classroom.example.com iburst Start: systemctl enable chronyd systemctl restart chronyd Validate: timedatectl status

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# cd /opt/

# mkdir dir

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

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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

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

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/etc/yum.repos.d/base.repo [base] name=base baseurl=http://instructor.example.com/pub/rhel6/dvd gpgcheck=0 yum list

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

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cd;umount /shrink e2fsck -f /dev/mapper/vgsrv-shrink resize2fs /dev/mapper/vgsrv-shrink 220M lvreduce -L 220M /dev/mapper/vgsrv-shrink mount -a

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#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***************

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getenforce // Check the current mode of SELinux // SELinux runs in enforcing mode // Check getenforce 1 getenforce vim /etc/selinux/config selinux=enforcing // To temporarily enable SELinux wg sestatus

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*

[root@node1 ~]# crontab -l -u natasha

no crontab for natasha

[root@node1 ~]# crontab -e -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

crontab: installing new crontab

[root@node1 ~]# crontab -l -u natasha

23 14 * * * /bin/echo hello

*/2 * * * * /bin/echo 2min

[root@node1 ~]# systemctl status crond.service

*

### For Checking ###

[root@node1 ~]# tail -f /var/log/cron

Mar 23 13:23:48 node1 crontab[10636]: (root) REPLACE (natasha) Mar 23 13:23:48 node1 crontab[10636]: (root) END EDIT (natasha) Mar 23 13:23:50 node1 crontab[10638]: (root) LIST (natasha) Mar 23 13:24:01 node1 crond[1349]: (root)

FAILED (loading cron table) Mar 23 13:24:02 node1 CROND[10673]: (natasha) CMD (/bin/echo 2min)

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* [root@node1 ~]# curl http://node1.domain15.example.com curl: (7) Failed to connect to node1.domain15.example.com port 80: Connection refused [root@node1 ~]# yum install httpd [root@node1 ~]# systemctl enable --now httpd Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service /usr/lib/systemd/system/httpd.service. [root@node1 ~]# systemctl start httpd [root@node1 ~]# systemctl status httpd Status: "Running, listening on: port 80" * [root@node1 ~]# wget http://node1.domain15.example.com 2021-03-23 13:27:28 ERROR 403: Forbidden. [root@node1 ~]# semanage port -l | grep http http_port_t tcp 80, 81, 443, 488, 8008, 8009, 8443, 9000 [root@node1 ~]# semanage port -a -t http_port_t -p tcp 82 [root@node1 ~]# semanage port -l | grep http http_port_t tcp 82, 80, 81, 443, 488, 8008, 8009, 8443, 9000 [root@node1 ~]# firewall-cmd --zone=public --list-all [root@node1 ~]# firewall-cmd --permanent --zone=public --add-port=82/tcp [root@node1 ~]# firewall-cmd --reload

[root@node1 ~]# curl http://node1.domain15.example.com OK

* root@node1 ~]# wget http://node1.domain15.example.com:82 Connection refused. [root@node1 ~]# vim /etc/httpd/conf/httpd.conf Listen 82 [root@node1 ~]# systemctl restart httpd [root@node1 ~]# wget http://node1.domain15.example.com:82 2021-03-23 13:31:41 ERROR 403: Forbidden. [root@node1 ~]# curl http://node1.domain15.example.com:82 OK