What Does Etc Resolv Conf Contain

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What Does /etc/resolv.conf Contain?

The /etc/resolv.conf file is a configuration file in Linux systems that contains information about the Domain Name System (DNS) servers used by the system to resolve domain names to IP addresses. It is a plain text file that can be edited with a text editor such as nano or vi.

Contents of /etc/resolv.conf

  • search: Specifies the search domains for the system. When a hostname is not fully qualified, the system will append the search domains to the hostname and attempt to resolve it.
  • nameserver: Specifies the IP addresses of the DNS servers used by the system. Multiple nameservers can be listed, and the system will try them in the order they are listed until it finds one that responds.
  • options: Specifies various options for the resolver. Common options include:
    • ndots: Specifies the number of dots in a hostname that must be present before the resolver will automatically append the search domains.
    • timeout: Specifies the timeout (in seconds) for DNS queries.
    • attempts: Specifies the number of times the resolver will attempt to contact a DNS server before giving up.
    • rotate: Specifies whether the resolver should rotate between the listed nameservers, or always use the first one.

Purpose of /etc/resolv.conf

The /etc/resolv.conf file is used by various programs and services on the system to resolve domain names to IP addresses. These include:

  • Web browsers
  • Email clients
  • DNS servers
  • Network utilities such as ping and traceroute

By default, the /etc/resolv.conf file is automatically updated by the system’s network configuration tool. However, it can be manually edited to specify custom DNS servers or other options.

Conclusion

The /etc/resolv.conf file is an important configuration file in Linux systems that controls how the system resolves domain names to IP addresses. Understanding the contents and purpose of this file is essential for troubleshooting DNS-related issues and customizing the system’s DNS settings.

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