Hostname Configuration
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Hostname Configuration

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Questions and Answers

What is the purpose of the /etc/hostname file?

  • To store the network name of the machine
  • To store the machine's IP address
  • To store the DNS domain name labels
  • To store the machine's hostname (correct)

    • What is the maximum length of the static hostname?

  • 128 characters
  • 32 characters
  • 64 characters (correct)
  • 256 characters

    • What is the main difference between the static hostname and the pretty hostname?

  • The static hostname is used for temporary configurations, while the pretty hostname is used for permanent configurations
  • The static hostname is used for DNS domain name labels, while the pretty hostname is used for descriptive names (correct)
  • The static hostname is used for IPv4, while the pretty hostname is used for IPv6
  • The static hostname includes special characters, while the pretty hostname does not

    • What is the purpose of the hostnamectl command with the set-hostname sub-command?

    <p>To set the machine's hostname permanently</p> Signup and view all the answers

    What is the transient hostname used for?

    <p>Used when the static hostname is not set or when it is the default localhost name</p> Signup and view all the answers

    Study Notes

    Hostname Configuration

    • The hostnamectl command can be used to set the hostname of a system.
    • If neither --pretty nor --transient option is used, all three hostname types (static, pretty, and transient) will be set to the given name.
    • The --static option can be used to set the static hostname only.
    • The static hostname is stored in the /etc/hostname file.

    hostnamectl Command

    • The hostnamectl command can be used to display various descriptive and identity bits of information about the running system.
    • The status sub-command can be omitted, as it is the default action of the hostnamectl command.

    System Information

    • The hostnamectl command can display the following information:
      • Static hostname
      • Pretty hostname
      • Transient hostname
      • Icon name
      • Chassis
      • Machine ID
      • Boot ID
      • Operating System
      • Kernel
      • Architecture

    Name Service Switch (NSS)

    • The NSS configuration file is /etc/nsswitch.conf.
    • The NSS configuration file is used to determine the sources for name-IP matches and to obtain name-service information in a range of categories, called databases.
    • The hosts database keeps track of the mapping between host names and host numbers.

    Modifying Hostname

    • The hostnamectl command can be used to modify the hostname of a system.
    • The --static option can be used to set the static hostname only.
    • The --pretty option can be used to set a more descriptive name for the machine.

    /etc/hosts File

    • The /etc/hosts file associates host names with IP addresses.
    • The format of the /etc/hosts file is: IP address hostname alias.

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    Related Documents

    LPI-Learning-Material-102-500-en-3.pdf

    Description

    Learn about configuring hostnames in Linux systems using the hostnamectl command. Understand the different options to set static, pretty, and transient hostnames.

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