RH124 - ch12s10

From workstation, run the lab net-hostnames start command. The command runs a start script that determine if the host, servera, is reachable on the network.

[student@workstation ~]$ lab net-hostnames start

Use the ssh command to log in to servera as the student user. The systems are configured to use SSH keys for authentication, so a password is not required to log in to servera.
```
[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$ 
```

View the current host name settings.

Display the current host name.

[student@servera ~]$ hostname
servera.lab.example.com

Display the host name status.

[student@servera ~]$ hostnamectl status
   Static hostname: n/a
Transient hostname: servera.lab.example.com
         Icon name: computer-vm
           Chassis: vm
        Machine ID: f874df04639f474cb0a9881041f4f7d4
           Boot ID: 22ae5279f57049678eda547bdb39a19d
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux 8.2 (Ootpa)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:8.2:GA
            Kernel: Linux 4.18.0-193.el8.x86_64
      Architecture: x86-64

Note the transient hostname obtained from DHCP or mDNS.

Set a static host name to match the current transient host name.

Change the host name and host name configuration file.

[student@servera ~]$ sudo hostnamectl set-hostname \
servera.lab.example.com
[sudo] password for student: student
[student@servera ~]$

View the content of the /etc/hostname file which provides the host name at network start.
```
servera.lab.example.com
```

Display the host name status.

[student@servera ~]$ hostnamectl status
   Static hostname: servera.lab.example.com
         Icon name: computer-vm
           Chassis: vm
        Machine ID: f874df04639f474cb0a9881041f4f7d4
           Boot ID: 22ae5279f57049678eda547bdb39a19d
    Virtualization: kvm
  Operating System: Red Hat Enterprise Linux 8.2 (Ootpa)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:8.2:GA
            Kernel: Linux 4.18.0-193.el8.x86_64
      Architecture: x86-64

Note that the transient hostname is not shown now that a static hostname has been configured.

Temporarily change the host name.

Change the host name.

[student@servera ~]$ sudo hostname testname

Display the current host name.
```
[student@servera ~]$ hostname
testname
```
View the content of the /etc/hostname file which provides the host name at network start.
```
servera.lab.example.com
```

Reboot the system.

[student@servera ~]$ sudo systemctl reboot
Connection to servera closed by remote host.
Connection to servera closed.
[student@workstation ~]$

From workstation log in to servera as student user.

[student@workstation ~]$ ssh student@servera
...output omitted...
[student@servera ~]$

Display the current host name.

[student@servera ~]$ hostname
servera.lab.example.com

Add a local nickname for the classroom server.

Look up the IP address of the classroom.example.com.

[student@servera ~]$ host classroom.example.com
classroom.example.com has address 172.25.254.254

Modify /etc/hosts so that the additional name of class can be used to access the IP address 172.25.254.254.

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

172.25.254.254 classroom.example.com classroom class
172.25.254.254 content.example.com content
...content omitted...

Look up the IP address of class.

[student@servera ~]$ host class
Host class not found: 2(SERVFAIL)
[student@servera ~]$ getent hosts class
172.25.254.254    classroom.example.com class

Ping class.

[student@servera ~]$ ping -c3 class
PING classroom.example.com (172.25.254.254) 56(84) bytes of data.
64 bytes from classroom.example.com (172.25.254.254): icmp_seq=1 ttl=64 time=0.397 ms
64 bytes from classroom.example.com (172.25.254.254): icmp_seq=2 ttl=64 time=0.447 ms
64 bytes from classroom.example.com (172.25.254.254): icmp_seq=3 ttl=64 time=0.470 ms

--- classroom.example.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.397/0.438/0.470/0.030 ms

Exit from servera.

[student@servera ~]$ exit
logout
Connection to servera closed.
[student@workstation ~]$

Finish

On workstation, run the lab net-hostnames finish script to finish this exercise.

[student@workstation ~]$ lab net-hostnames finish

This concludes the guided exercise.

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VictoriaB97

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Red Hat System Administration I (RH124)

Haley_Ruccio

19 lip 2023

The first of two courses covering the core system administration tasks needed to manage Red Hat Enterprise Linux serversRed Hat System Administration I (RH124) is designed for IT professionals without previous Linux system administration experience. The course provides students with Linux administration competence by focusing on core administration tasks. This course also provides a foundation for students who plan to become full-time Linux system administrators by introducing key command-line concepts and enterprise-level tools. This course is the first of a two-course series that takes a computer professional without Linux system administration knowledge to become a fully capable Linux administrator. These concepts are further developed in the follow-on course, Red Hat System Administration II (RH134).This course is based on Red Hat® Enterprise Linux 9.0.Course content summaryIntroduce Linux and the Red Hat Enterprise Linux ecosystem.Run commands and view shell environments.Manage, organize, and secure files.Manage users, groups and user security policies.Control and monitor systemd services.Configure remote access using the web console and SSH.Configure network interfaces and settings.Manage software using DNFAudience for this courseThe primary persona is a technical professional with current or pending responsibilities as a Linux enterprise or cloud system administrator.This course is popular in Red Hat Academy, and is targeted at the student who is planning to become a technical professional using Linux.Prerequisites for this courseBasic technical user skills with computer applications on some operating systems are expected.Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technical requirements for this course.This course is not designed for bring your own device (BYOD).Internet access is not required but is recommended so that students can research and browse Red Hat online resources.

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Revision: rh124-8.2-df5a585