1. View the current hostname
method 1:
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Method 2: centos7 and above
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2. Temporarily modify the host name
Temporary modification will not take effect after restarting the server
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View the IP address corresponding to the machine name
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3. Permanently modify the host name
Need to modify the following two configuration files
1. Method 1: Use hostnamectl command, applicable for contos7 and above
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2. Method 2: Modify the configuration file /etc/hostname, save and exit
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Note: The above two permanent modification methods need to restart the machine to take effect
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