RHCSA Rapid Track

Reset your serverX system.

1. View the current host name settings.

   1. Display the current host name.

      [student@serverX ~]$ hostname
      serverX.example.com
      

   2. Display the host name status.

      [student@serverX ~]$ hostnamectl status
         Static hostname: n/a
      Transient hostname: serverX.example.com
               Icon name: computer
                 Chassis: n/a
              Machine ID: 9f6fb63045a845d79e5e870b914c61c9
                 Boot ID: d4ec3a2e8d3c48749aa82738c0ea946a
        Operating System: Red Hat Enterprise Linux Server 7.0 (Maipo)
             CPE OS Name: cpe:/o:redhat:enterprise_linux:7.0:GA:server
                  Kernel: Linux 3.10.0-97.el7.x86_64
            Architecture: x86_64
      

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

   1. Change the host name and host name configuration file. Replace the X with your station number and match the output of the previous step.

      [student@serverX ~]$ sudo hostnamectl set-hostname serverX.example.com
      

   2. View the configuration file providing the host name at network start.

      [student@serverX ~]$ cat /etc/hostname
      serverX.example.com
      

   3. Display the host name status.

      [student@serverX ~]$ hostnamectl status
         Static hostname: serverX.example.com
               Icon name: computer
                 Chassis: n/a
              Machine ID: 9f6fb63045a845d79e5e870b914c61c9
                 Boot ID: d4ec3a2e8d3c48749aa82738c0ea946a
        Operating System: Red Hat Enterprise Linux Server 7.0 (Maipo)
             CPE OS Name: cpe:/o:redhat:enterprise_linux:7.0:GA:server
                  Kernel: Linux 3.10.0-97.el7.x86_64
            Architecture: x86_64
      

3. Temporarily change the host name.

   1. Change the host name.

      [student@serverX ~]$ sudo hostname testname
      

   2. Display the current host name.

      [student@serverX ~]$ hostname
      testname
      

   3. View the configuration file providing the host name at network start.

      [student@serverX ~]$ cat /etc/hostname
      serverX.example.com
      

   4. Reboot the system.

      [student@serverX ~]$ reboot
      

   5. Display the current host name.

      [student@serverX ~]$ hostname
      serverX.example.com
      

4. Add a local nickname for the classroom server.

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

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

   2. Modify /etc/hosts so that the name class has the IP address 172.25.254.254 and can be used to communicate with classroom.example.com.

      [student@serverX ~]$ sudo vim /etc/hosts
      [student@serverX ~]$ cat /etc/hosts
      127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
      ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
      
      172.25.254.254 classroom.example.com class
      172.25.254.254 content.example.com
      

   3. Look up the IP address of the class.

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

   4. Ping class.

      [student@serverX ~]$ 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