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| Section | Objectives |
|---|---|
| Topic 1: Manage security | - Manage SELinux port labels - Use Boolean settings to modify SELinux settings - Configure firewall settings using firewall-cmd and firewalld - Set enforcing and permissive modes for SELinux - List and identify SELinux file and process contexts - Manage default file permissions - Restore default file contexts - Configure key-based authentication for SSH |
| Topic 2: Manage basic networking | - Configure IPv4 and IPv6 addresses - Configure hostname resolution - Configure network services to start automatically at boot - Restrict network access using firewalld and firewall-cmd |
| Topic 3: Understand and use essential tools | - Access a shell prompt and issue commands with correct syntax - Access remote systems using SSH - Use input-output redirection - Use grep and regular expressions to analyze text - Locate, read, and use system documentation - Create and edit text files - Log in and switch users in multi-user targets - List, set, and change standard ugo/rwx permissions - Create hard and soft links - Archive, compress, unpack, and uncompress files using tar, gzip, and bzip2 - Create, delete, copy, and move files and directories |
| Topic 4: Manage users and groups | - Create, delete, and modify local groups and group memberships - Configure privileged access - Create, delete, and modify local user accounts - Change passwords and adjust password aging for local users |
| Topic 5: Create simple shell scripts | - Conditionally execute code - Process output of shell commands within a script - Use looping constructs to process files and command-line input - Process script inputs |
| Topic 6: Deploy, configure, and maintain systems | - Schedule tasks using at, cron, and systemd timer units - Configure time service clients - Modify the system bootloader - Configure systems to boot into a specific target automatically - Install and update software packages - Start and stop services and configure services to start automatically at boot |
| Topic 7: Configure local storage | - Configure systems to mount file systems at boot by UUID or label - Add new partitions, logical volumes, and swap non-destructively - List, create, and delete partitions on GPT disks - Create and delete logical volumes - Create and remove physical volumes - Assign physical volumes to volume groups |
| Topic 8: Manage software | - Install and remove Flatpak software packages - Configure access to Flatpak repositories - Configure access to RPM repositories - Install and remove RPM software packages |
| Topic 9: Create and configure file systems | - Configure autofs - Mount and unmount network file systems using NFS - Create, mount, unmount, and use VFAT, ext4, and XFS file systems - Diagnose and correct file permission problems - Extend existing logical volumes |
| Topic 10: Operate running systems | - Boot, reboot, and shut down a system normally - Locate and interpret system log files and journals - Boot systems into different targets manually - Manage tuning profiles - Adjust process scheduling - Interrupt the boot process to gain access to a system - Securely transfer files between systems - Identify CPU and memory intensive processes and kill processes - Start, stop, and check the status of network services - Preserve system journals |
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질문 # 62
SIMULATION
Create a volume group, and set the size is 500M, the size of single PE is 16M. Create logical volume named lv0 in this volume group, set size is 20 PE, make it as ext3 file system, and mounted automatically under data.
정답：
설명：
See explanation below.
Explanation/Reference:
Explanation: fdisk /dev/vda
pvcreate /dev/vda3
vgcreate -s 16M vg0 /dev/vda3
lvcreate -n lv0 -l 20 vg0
mkfs.ext3 /dev/mapper/vg0-lv0
mkdir /data
/etc/fstab:
/dev/mapper/vg0-lv0 /data ext3 defaults 0 0
mount -a
mount | grep data
질문 # 63
Configure your Host Name, IP Address, Gateway and DNS.
Host name: dtop5.dn.ws.com
IP Address: 172.28.10.5/4
Gateway: 172.28.10.1
DNS: 172.28.10.1
정답：
설명：
see explanation below.
Explanation
* Configure Host Name
* vim /etc/sysconfig/network NETWORKING=yes HOSTNAME=dtop5.dn.ws.com
GATEWAY=172.28.10.1
2. Configure IP Address, Gateway and DNS
Configure the network by Network Manager:
Note: Please remember to choose two options:
* Connect automatically
* Available to all users
Click "Apply", save and exit, and restart your network services:
# Service network restart
3. Validate these profiles:
a) Check gateway: # vim / etc / sysconfig / network
NETWORKING=yes
HOSTNAME=dtop5.dn.ws.com
GATEWAY=172.28.10.1
b) Check Host Name: # vim /etc/hosts
c) Check DNS: # vim /etc/resolv.conf
# Generated by NetworkManager
Search dn.ws.com
Nameserver 172.28.10.1
d) Check Gateway: # vim /etc/sysconfig/network-scripts/ifcfg-eth0
질문 # 64
One Domain RHCE is configured in your lab, your domain server is server1.example.com. nisuser2001, nisuser2002, nisuser2003 user are created on your server 192.168.0.254:/rhome/stationx/nisuser2001. Make sure that when NIS user login in your system automatically mount the home directory. Home directory is separately shared on server /rhome/stationx/ where x is your Station number.
정답：
설명：
use the authconfig --nisserver=<NIS SERVER> --nisdomain=<NIS DOMAIN> -- update Example: authconfig --niserver=192.168.0.254 --nisdomain=RHCE --update or system-config-authentication Click on Enable NIS Type the NIS Domain: RHCE Type Server 192.168.0.254 then click on next and ok You will get a ok message.
Create a Directory /rhome/stationx where x is your station number.
vi /etc/auto.master and write at the end of file /rhome/stationx /etc/auto.home --timeout=60 vi /etc/auto.home and write
* -rw,soft,intr 192.168.0.254:/rhome/stationx/&
Note: please specify your station number in the place of x.
Service autofs restart
Login as the nisuser2001 or nisuser2002 on another terminal will be Success. According to question, RHCE domain is already configured. We have to make a client of RHCE domain and automatically mount the home directory on your system. To make a member of domain, we use the authconfig with option or system-config authentication command. There a are lots of authentication server i.e NIS, LDAB, SMB etc. NIS is a RPC related Services, no need to configure the DNS, we should specify the NIS server address.
Here Automount feature is available. When user tried to login, home directory will automatically mount. The automount service used the /etc/auto.master file. On
/etc/auto.master file we specified the mount point the configuration file for mount point.
질문 # 65
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.)
정답：A,B
설명：
Explanation/Reference:
Reference https://docs.docker.com/v17.09/engine/userguide/networking/#bridge-networks
질문 # 66
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".
정답：
설명：
Solution:
# 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=1
72.25.254.254)
질문 # 67
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