[2025年05月] 学習材料には有効なEX200効率的問題集！
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Red Hat Certified System Administrator（RHCSA）は、Red Hat Enterprise Linux（RHEL）のスキルを検証したいITプロフェッショナルの人気のある認定試験です。この試験は、エンタープライズ環境でRHELシステムの管理と管理を担当するITプロフェッショナルを対象としています。 RHCSA認定はグローバルに認識されており、雇用主とITの専門家によって高く評価されています。
質問 # 38
The following command is issued on two docker nodes:
docker network create --driver bridge isolated_nw
Afterwards, one container is started at each node with the parameter --network=isolated_nw. It turns out
that the containers can not interact with each other. What must be done in order to allow the containers to
interact with each other? (Choose two correct answers.)
- A. Change the --networkparameter of docker create to --network=isolated_nw,nofence.
- B. Start the containers on the same node.
- C. Use an overlay network instead of a bridged network.
- D. Add the option --inter-containerto the docker network createcommand.
- E. Use a host network instead of a bridged network.
正解：A、B
解説：
Explanation/Reference:
Reference https://docs.docker.com/v17.09/engine/userguide/networking/#bridge-networks
質問 # 39
Copy /etc/fstab document to /var/TMP directory. According the following requirements to configure the permission of this document.
The owner of this document must be root.
This document belongs to root group.
User mary have read and write permissions for this document.
User alice have read and execute permissions for this document.
Create user named bob, set uid is 1000. Bob have read and write permissions for this document.
All users has read permission for this document in the system.
正解：
解説：
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
質問 # 40
The system ldap.example.com provides an LDAP authentication service.
Your system should bind to this service as follows:
The base DN for the authentication service is dc=domain11, dc=example, dc=com LDAP is used to provide both account information and authentication information. The connection should be encrypted using the certificate at http://host.domain11.example.com/pub/domain11.crt When properly configured, ldapuserX should be able to log into your system, but will not have a home directory until you have completed the autofs requirement. Username: ldapuser11 Password: password
正解：
解説：
see explanation below.
Explanation
* system-config-authentication LDAP user DN=dc=domain11,dc=example,dc=com Server= host.domain11.example.com Certificate
http://host.domain11.example.com/pub/domain11.crt (enter url carefully, there maybe // or ..) LDAP password OK starting sssd
* su -ldapuser11 Display Bash prompt #exit
質問 # 41
Configure NTP
Configure your system to synchronize with the NTP server of materials.example.com (Note: materials.example.com is an alias for classroom.example.com).
正解：
解説：
# Install the chrony service for configuring NTP server
[root@node1 ~]# yum -y install chrony
[root@node1 ~]# vim /etc/chrony.conf
server materials.example.com iburst
[root@node1 ~]# systemctl restart chronyd
[root@node1 ~]# systemctl enable chronyd
# Check
# Set an arbitrary time
[root@node1 ~]# date -s "1982-1-1"
Fri Jan 1 12:00:00 AM EST 1982
# Restart the NTP server
[root@node1 ~]# systemctl restart chronyd
# Check if the time is synchronized
# Execute after 3-5 seconds, too fast won't synchronize the time
[root@node1 ~]# date
Tue Dec 12 11:40:19 PM EST 2023
# Use the chronyc command to check synchronization status
[root@node1 ~]# chronyc sources -v
.-- Source mode '^' = server, '=' = peer, '#' = local clock.
/ .- Source state '*' = current best, '+' = combined, '-' = not combined,
| / 'x' = may be in error, '~' = too variable, '?' = unusable.
|| .- xxxx [ yyyy ] +/- zzzz
|| Reachability register (octal) -. | xxxx = adjusted offset,
|| Log2(Polling interval) --. | | yyyy = measured offset,
|| \ | | zzzz = estimated error.
|| | | \
MS Name/IP address Stratum Poll Reach LastRx Last sample
^* classroom.lab.example.com 8 6 17 42 -14us[ -11us] +/- 463us
質問 # 42
SIMULATION
User mary must configure a task.
Requirement: The local time at 14:23 every day echo "Hello World.".
正解：
解説：
See explanation below.
Explanation/Reference:
Explanation: crontab -u mary -e
23 14 * * * echo "Hello World."
質問 # 43
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.
正解：
解説：
see explanation below.
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
質問 # 44
SIMULATION
In the system, mounted the iso image /root/examine.iso to/mnt/iso directory. And enable automatically mount (permanent mount) after restart system.
正解：
解説：
See explanation below.
Explanation/Reference:
Explanation:
/etc/fstab:
/root/examine.iso /mnt/iso iso9660 loop 0 0 mount -a
mount | grep examine
質問 # 45
Copy /etc/fstab to /var/tmp name admin, the user1 could read, write and modify it, while user2 without any permission.
正解：
解説：
# 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
質問 # 46
Configure autofs
Configure autofs to automatically mount the home directory of a remote user as described below:
- materials.example.com (172.25.254.254) exports /rhome via NFS to your system. This filesystem contains a pre-configured home directory for the user remoteuser1.
- The home directory of remoteuser1 is materials.example.com:/rhome/remoteuser1.
- The home directory of remoteuser1 should be automatically mounted locally at /rhome/remoteuser1.
- The home directory must be writable by the user.
- The password for remoteuser1 is "flectrag".
正解：
解説：
# Preparations (not required for the exam)
# Go back to foundation0, remote into classroom, create the remoteuser1 user and directory.
# This step is necessary to avoid issues with autofs mounting during testing.
[kiosk@foundation0 ~]$ ssh root@classroom 'useradd -u 1010 remoteuser1 && mkdir -p /rhome/remoteuser1 && chown remoteuser1: /rhome/remoteuser1'
# Install nfs-utils and autofs
[root@node1 ~]# yum -y install nfs-utils autofs
[root@node1 ~]# vim /etc/auto.master
/rhome /etc/auto.rhome
[root@node1 ~]# vim /etc/auto.rhome
remoteuser1 -rw materials.example.com:/rhome/remoteuser1
[root@node1 ~]# systemctl enable --now autofs
# Verification
[root@node1 ~]# ll /rhome/
[root@node1 ~]# ssh remoteuser1@localhost
remoteuser1@localhost\'s password: `flectrag`
$ pwd
/rhome/remoteuser1
$ touch my.file
$ mount | grep rhome
...
materials.example.com:/rhome/remoteuser1 on /rhome/remoteuser1 type nfs4 (`rw`,relatime,vers=4.2,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=172.25.250.100,local_lock=none,addr=172.25.254.254)
質問 # 47
SIMULATION
Configure your NFS services. Share the directory by the NFS Shared services.
正解：
解説：
See explanation below.
Explanation/Reference:
Explanation: /etc/init.d/rpcbind start
/etc/init.d/nfslock start
/etc/init.d/nfs start
chkconfig rpcbind on
chkconfig nfslock on
chkconfig nfs on
showmount -e localhost
質問 # 48
Create the user named eric and deny to interactive login.
正解：
解説：
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.
質問 # 49
Configure your web services, download from http://instructor.example.com/pub/serverX.html And the services must be still running after system rebooting.
正解：
解説：
cd /var/www/html
wget http://instructor.example.com/pub/serverX.html mv serverX.html index.html /etc/init.d/httpd restart chkconfig httpd on
質問 # 50
The file index.php, which is being maintained in a git repository, was changed locally and contains an error. If
the error has not been committed to the repository yet, which of the following gitcommands reverts the local
copy of index.phpto the latest committed version in the current branch?
- A. git revert - index.php
- B. git checkout - index.php
- C. git repair - index.php
- D. git lastver - index.php
- E. git clean - index.php
正解：A
解説：
Explanation/Reference:
Reference https://git-scm.com/docs/git-revert
質問 # 51
Part 1 (on Node1 Server)
Task 1 [Managing Networking]
Please create new network connection with existing interface (enp1s0) using provided values:
IPv4: 172.25.X.10/255.255.255.0 (where X is your domain number: Domain15) Gateway: 172.25.X.2 DNS server: 172.25.X.2 Add the following secondary IP addresses statically to your current running connection. Do this in a way that does not compromise your existing settings:
IPv4: 10.0.0.5/24 and set the hostname node1.domain15.example.com
正解：
解説：
* [root@node1 ~]# nmcli connection show
[root@node1 ~]# nmcli connection add con-name static ifname enp1s0 type ethernet ipv4.addresses 172.25.15.10/24 ipv4.gateway 172.25.15.2 ipv4.dns 172.25.15.2
[root@node1 ~]# nmcli connection modify static ipv4.method manual connection.autoconnect yes
[root@node1 ~]# nmcli connection modify static +ipv4.addresses 10.0.0.5/24
[root@node1 ~]# nmcli connection up static
[root@node1 ~]# nmcli connection show
[root@node1 ~]# hostnamectl set-hostname node1.domain15.example.com
[root@node1 ~]# hostnamectl status
[root@node1 ~]# nmcli connection down static
* [root@node1 ~]# nmcli connection up static
[root@node1 ~]# ip addr show
[root@node1 ~]# reboot
### For checking ###
[root@node1 ~]# ip addr show
[root@node1 ~]# netstat -nr
[root@node1 ~]# cat /etc/resolv.conf
質問 # 52
Set Root Password
Set the root password of node2 to "redhat." You need to gain system access to perform this operation.
正解：
解説：
***Restart the node2 machine and wait for the screen shown in Image 1.
Press "e" to enter the screen shown in Image 2. The original configuration is as shown in the image. Modify the original configuration to the part highlighted in red box, as shown in Image 2. Then press "Ctrl+X" to execute the following commands:
# chroot /sysroot
# echo redhat |passwd --stdin root
# touch /.autorelabel
# sync
# exit
# reboot
質問 # 53
One Logical Volume named /dev/test0/testvolume1 is created. The initial Size of that disk is 100MB now you required more 200MB. Increase the size of Logical Volume, size should be increase on online.
正解：
解説：
see explanation below.
Explanation
* lvextend -L+200M /dev/test0/testvolume1 Use lvdisplay /dev/test0/testvolume1)
* ext2online -d /dev/test0/testvolume1
lvextend command is used the increase the size of Logical Volume. Other command lvresize command also here to resize. And to bring increased size on online we use the ext2online command.
質問 # 54
Debugging SELinux
A web server running on non-standard port 82 encounters issues while serving content. Debug and resolve the problem to meet the following conditions:
- The web server on the system can serve HTML files hosted in /var/www/html (Note: Do not delete or modify existing file contents)
- The web server can serve content on port 82
- The web server can start automatically at system boot
正解：
解説：
# Check which package provides the semanage command
[root@node1 ~]# yum provides "*/semanage"
# Install the semanage command
[root@node1 ~]# yum -y install policycoreutils-python-utils
[root@node1 ~]# semanage port -l |grep http
[root@node1 ~]# semanage port -a -t http_port_t -p tcp 82
# Alternatively, you can use man semanage port, then search for EXAMPLE.
[root@node1 ~]# systemctl restart httpd
[root@node1 ~]# systemctl enable httpd
# Verification, seeing the source code indicates correctness (mandatory operation)
[root@node1 ~]# curl http://node1.domain250.example.com:82
質問 # 55
Binding to an external validation server.
System server.domain11.example.com provides a LDAP validation service, your system should bind to this service as required:
Base DN of validation service is dc=example,dc=com
LDAP
is used for providing account information and validation information Connecting and using the certification of
http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to encrypt
After the correct configuration, ldapuser1 can log into your system, it does not have HOME directory until you finish autofs questions, ldapuser1 password is password.
正解：
解説：
see explanation below.
Explanation
yum -y install sssd authconfig-gtk krb5-workstation authconfig-gtk // open the graphical interface Modify user account database to ldap, fill up DN and LDAP SERVER as questions required, use TLS to encrypt connections making tick, write http://server.domain11.example.com/pub/EXAMPLE-CA-CERT to download ca, authentication method choose ldap password.
You can test if the ldapuser is added by the following command:
Id ldapuser1
Note: user password doesn't not need to set
質問 # 56
CORRECT TEXT
Configure a task: plan to run echo hello command at 14:23 every day.
正解：
解説：
# which echo
# crontab -e
23 14 * * * /bin/echo hello
# crontab -l (Verify)
質問 # 57
......
RHCSA試験を受験するには、Linux管理と基本的なコマンドラインスキルについての十分な理解が必要です。また、Red Hat Enterprise Linuxまたは他のLinuxディストリビューションでの作業経験が必要です。この試験は、システム管理、ネットワーク管理、セキュリティ、およびトラブルシューティングなど、広範なトピックをカバーしています。
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