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====== Change HostName ======
<color #db5f0b>Apr 2023</color>
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To change the hostname of an Alma Linux instance, use the following procedure. 
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First, check the current hostname: from the console enter:
    hostname
    
    or 
    
    hostnamectl
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This will give an output similar to below:
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<file>
   Static hostname: localhost.localdomain
         Icon name: computer-server
           Chassis: server
        Machine ID: 87b77afdf05948d88282bb44dc1e8386
           Boot ID: a7c17a79aa394c2f84758fa133c735cb
  Operating System: AlmaLinux 8.5 (Arctic Sphynx)
       CPE OS Name: cpe:/o:almalinux:almalinux:8::baseos
            Kernel: Linux 4.18.0-348.el8.x86_64
      Architecture: x86-64
</file>
In this example we can see that the hostname is the default value of <color #ed1c24>localhost.localdomain</color> and we want to change this to something that we can use and recognise.
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To set the hostname use the following:
    hostnamectl set-hostname 'your-hostname'
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For example, lets say I want to change the hostname to be mailsvr, then I would use:
    hostnamectl set-hostname mailsvr
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We can now check the hostname from the console again using:
    hostname
    
    or 
    
    hostnamectl
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The hostname returned will now be the one you set (mailsvr) in this example.
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We also need to edit the following file:
    /etc/hosts
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Add a line at the end of the file with your <color #ed1c24>Alma Linux IP</color> and the <color #ed1c24>hostname</color> you just used:
<file>
127.0.0.1   controller localhost.localdomain localhost4 localhost4.localdomain4
::1         controller localhost.localdomain localhost6 localhost6.localdomain6
150.10.10.1    mailsvr
</file>
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Now reboot the Alma Linux instance.
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When you log back in, you should see your command prompt now contains your hostname:
    [root@mailsvr /]#
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Hostname setting is complete.
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