Latest PDF of EX300: Red Hat Certified Engineer

Red Hat Certified Engineer - RHCE Practice Test

EX300 Exam Format | Course Contents | Course Outline | Exam Syllabus | Exam Objectives

The performance-based Red Hat Certified Engineer (RHCE) exam for Red Hat Enterprise Linux 7 (EX300) tests to determine if your knowledge, skill, and ability meet those required of a senior system administrator responsible for Red Hat® Enterprise Linux® systems. Red Hat Certified System Administrator (RHCSA®) certification is required to earn RHCE® certification.

The exam based on Red Hat Enterprise Linux 7 is available via on-site and individual exams until July 1, 2020.
An RHCE certification is earned by a Red Hat Certified System Administrator (RHCSA) who has demonstrated the knowledge, skill, and ability required of a senior system administrator responsible for Red Hat Enterprise Linux systems

Local and remote logins
Review methods for accessing the system and engaging Red Hat Support.
File system navigation
Copy, move, create, delete, link, and organize files while working from the Bash shell prompt.
Users and groups
Manage Linux users and groups and administer local password policies.
File permissions
Control access to files and directories using permissions and access control lists (ACLs).
SELinux permissions
Manage the SELinux behavior of a system to keep it secure in case of a network service compromise.
Process management
Evaluate and control processes running on a Red Hat Enterprise Linux system.
Updating software packages
Download, install, update, and manage software packages from Red Hat and yum package repositories.
Creating and mounting file systems
Create and manage disks, partitions, and filesystems from the command line.
Service management and boot troubleshooting
Control and monitor system daemons and troubleshoot the Red Hat Enterprise Linux boot process.
Network configuration
Configure basic IPv4 networking on Red Hat Enterprise Linux systems.
System logging and ntp
Locate and accurately interpret relevant system log files for troubleshooting purposes.
Logical volume management
Create and manage logical volumes from the command line.
Scheduled processes
Schedule tasks to automatically execute in the future.
Mounting network file systems
Use autofs and the command line to mount and unmount network storage with NFS and SMB.
Firewall configuration
Configure a basic firewall.
Virtualization and kickstart
Automate the installation of Red Hat Enterprise Linux on virtual machines with kernel-based virtual machine (KVM) and libvirt.
Managing IPv6 networking
Configure and troubleshoot basic IPv6 networking on Red Hat Enterprise Linux systems.
Configuring link aggregation and bridging
Configure and troubleshoot advanced network interface functionality including bonding, teaming, and local software bridges.
Controlling network port security
Permit and reject access to network services using advanced SELinux and firewalld filtering techniques.
Managing DNS for Servers
Set and verify correct DNS records for systems and configure secure-caching DNS.
Configuring E-mail Delivery
Relay all e-mail sent by the system to a SMTP gateway for central delivery.
Providing block-based storage
Provide and use networked iSCSI block devices as remote disks.
Providing file-based storage
Provide NFS exports and SMB file shares to specific systems and users.
Configuring MariaDB databases
Provide a MariaDB SQL database for use by programs and database administrators.
Providing Apache HTTPD Web Service
Configure Apache HTTPD to provide Transport Layer Security (TLS)-enabled websites and virtual hosts.
Writing Bash scripts
Write simple shell scripts using Bash.
Bash conditionals and control structures
Use Bash conditionals and other control structures to write more sophisticated shell commands and scripts.
Configuring the shell environment
Customize Bash startup and use environment variables, Bash aliases, and Bash functions.

Lab content summary
Managing and troubleshooting systemd services during the boot process
Network configuration and basic troubleshooting
Managing local storage, creating and using file systems
Firewall management with firewalld
Automating installation of Red Hat Enterprise Linux® using kickstart
Manage SELinux settings
Using NFS and Samba shared filesystems
iSCSI initiator and target configuration
Domain Name System (DNS) troubleshooting and caching name server
Providing Network File System (NFS) and Server Message Block (SMB) file servers
Apache HTTPD web server management
MariaDB SQL database configuration
Postfix Simple Mail Transfer Protocol (SMTP) nullclient for servers
Bash scripting for automation

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Question #29 Section 2
Create a Shell script /root/program:
The shell script will come back to "user" parameter when you are entering "kernel" parameter.
The shell script will come back to "kernel" when you are entering "user" parameter.
It will output the standard error when this script "usage:/root/program kernel|user" don�t input any parameter or the parameter you
inputted is entered as the requirements.
Answer: See Explanation
[root@server1 virtual]# cat /root/program
#!/bin/bash param1="$1"
if [ "$param1" == "kernel" ]; then echo "user"
elif [ "$param1" == "user" ]; then echo "kernel" else
echo "usage:/root/program kernel|user" fi
[root@server1 ~]# chmod +x /root/program
Question #30 Section 2
Given the kernel of a permanent kernel parameters: sysctl=1.
It can be shown on cmdline after restarting the system.
Kernel of /boot/grub/grub.conf should be added finally, as:
Answer: See Explanation
Kernel of /boot/grub/grub.conf should be added finally, as:
kernel /vmlinuz-2.6.32-279.1.1.el6.x86_64 ro root=/dev/mapper/vgsrv-root rd_LVM_LV=vgsrv/root rd_NO_LUKS
LANG=en_US.UTF-8 -
rd_LVM_LV=vgsrv/swap rd_NO_MD
SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYTABLE=us rd_NO_DM rhgb quiet rhgb quiet sysctl=1
KEYBOARDTYPE=pc
Question #31 Section 2
Forbidden the Mary user configuration tasks in your system.
Answer: See Explanation
Modify the /etc/cron.deny, add:
[root@server1 ~]# cat /etc/cron.deny mary
Conclusions:
1. I find that it is common to add various service access limits in the exam RHCE. The exercises like: require one network segment
can be accessed another network segments can not be accessed, the following are some conclusions for various service:
tcp_wrappers:/etc/hosts.allow,/etc/hosts.deny tcp_wrappers can filter the TCPs accessing service. TCP whether has the filtering
function which depends on this service whether use the function library of tcp_wrappers, or this service whether has the xinetd
process of starting function of tcp_wrappers. tcp_wrapperss main configuration file is /etc/hosts.allow,/etc/ hosts.deny.
And the priority of the documents in hosts. allow is higher than hosts. deny. Visit will be passed if no match was found. sshd,vsftpd
can use the filtering service of tcp_wrappers.
Configuration example:
150.203.6.66
sshd:.example.com 192.168.0. 192.168.0.0/255.255.255.0 150.203. EXCEPT
Notice:
The two configuration files syntax can refer to hosts_access(5) and hosts_options(5) sshd_config
There are four parameters in this configuration file: DenyUsers, AllowUsers, DenyGroups, AllowGroups, they are used to limit
some users or user groups to proceed Remote Login through the SSH. These parameters priority level is DenyUsers->AllowUsers-
>DenyGroups->AllowGroups Configuration example:
AllowUsers tim rain@192.168.1.121 kim@*.example.com
httpd Service
Through the /etc/httpd/conf/httpd.conf in parameters, can add to control the url access. Just as:

DocumentRoot /var/http/virtual -
ServerName www1.example.com -
Options Indexes MultiViews FollowSymlinks order deny,allow deny from all allow from
192.168.0.

Notice:
So pay attention, denys and allows priority level in order deny,allow is: the backer has the higher priority level. But here, allows
priority has a higher priority level.
nfs Service
nfs service directly control the visits through file /etc/exports, just as:
/common *.example.com(rw,sync) 192.168.0.0/24(ro,sync)
samba Service
Parameter hosts allow in /etc/samba/smb.conf which is used as Access Control,just as: hosts allow = 192.168.0.
192.168.1.0/255.255.255.0 .example.com
2. Paying attention to use Mount parameters: _netdev,defaults when you are mounting ISCSI disk.
3. Stop the NetworkManager
/etc/init.d/NetworkManager stop
chkconfig NetworkManager off
5. When you are deploying ifcfg-ethX, add parameters:
PEERDNS=no -
6. Empty the firewall in RHCSA, RHCE:
iptables -F
iptables -X
iptables -Z
/etc/init.d/iptables save
7. Narrow lv steps:
1.umount /dev/mapper/lv
2.e2fsck -f /dev/mapper/lv
3.resize2fs /dev/mapper/lv 100M
4.lvreduce -L 50M /dev/mapper/lv
5.mount -a
8. Mount the using command - swap which is newly added in /etc/fstab
9. If Verification is not passed when you are installing software, can import public key: rpm import /etc/pki/rpm/release and so on.
In yum.repo, you also can deploy gpgkey, for example, gpgkey=/etc/pki/rpm/release
10. When you are using "Find" command to search and keep these files, paying attention to use cp -a to copy files if you use user
name and authority as your searching methods.
Question #32 Section 2
Please set the selinux status as enforcing.
Answer: See Explanation
# getenforce 1
# vim /etc/sysconfig/selinux
SELINUX=enforcing
Question #33 Section 2
Please open the ip_forward, and take effect permanently.
Answer: See Explanation
# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
(takes effect immediately)
# sysctl -w
If no "sysctl.conf" option, use these commands:
# sysctl -a |grep net.ipv4
# sysctl -P net.ipv4.ip_forward = 1
# sysctl -w
Question #34 Section 2
Configure ssh to allow user harry to access, reject the domain t3gg.com (172.25.0.0/16) to access.
Answer: See Explanation
# yum install -y sshd
# chkconfig sshd on
# vim /etc/hosts.deny
sshd: 172.25.0.0/16
# service sshd restart
Use iptables:
# chkconfig iptables on
# iptables -F
# iptables -X
# iptables -Z
# iptables -nvL
# iptables -A INPUT -s 172.25.0.0/16 -p tcp --dport 22 -j REJECT
# services iptables save
# iptables -nvL
check port)
# cat /etc/services (
Question #35 Section 2
Configure the ftp to allow anonymously download the directory /var/ftp/pub, and reject the domain t3gg.com to access.
Answer: See Explanation
# yum install -y vsftpd
# chkconfig vsftpd on
# services vsftpd start
# vim /etc/hosts.deny
vsftpd: 172.25.0.0/16
OR -
# iptables -A INPUT -s 172.25.0.0/16 -p tcp -dport 20:21 -j REJECT
# services iptables save
Question #36 Section 2
Shutdown the /root/cdrom.iso under /opt/data, and set as boot automatically mount.
Answer: See Explanation
# cd /opt/
# mkdir data
# mount -t iso9660 -o loop /root/cdrom.iso /opt/data
# vim /etc/fstab
/root/cdrom.iso /opt/data iso9660 defaults,loop 0 0
# mount -a
# mount
vi /etc/fstab
192.168.0.254:/data / common nfs defaults 0 0
reboot the system.
/( 48(67,216

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