Resolv.conf

The file is Article description::used to configure hostname resolution. It may be manually configured by the system administrator, or may be automatically populated by various network configuration tools. It is commonly used to manage DNS requests.

Syntax
The syntax of is relatively straight-forward. Each line specifies an option: most commonly nameserver, search or domain. Not every line is necessary; it is entirely possible to have a blank file, while maintaining a working system.

nameserver
The nameserver option takes the IP address that the resolver should query, either in IPv4 or IPv6 form. Multiple lines may be specified, but each line must have only one IP address. A maximum of three should be present in total. If more than one IP address is present, the resolver queries them in the order listed. If no nameserver entries are present, it will default to 127.0.0.1.

search
The search option accepts up to six domains, separated by tabs or spaces. This is used if the resolver receives a request without any dots in it. It will then try to resolve the query with the search domain appended, then the original request. For example, if the search domain was example.com, and you requested http://test/index.html, it would first query http://test.example.com/index.html, and then http://test/index.html.

domain
The domain option specifies the local domain name. It is essentially an entry into the search list for devices on the local domain.

The domain and search keywords are mutually exclusive, and if both are present, the one that appears last takes preference. For more syntax options, check in the manpages.

NetworkManager
When using NetworkManager, should be a symlink pointing at.

DHCPCD
By default, dhcpcd overwrites with the suggested configuration of the connected network. This behaviour can be completely disbled by modifying :

Alternatively, one may edit or, which will be appended to the start or end of , respectively.

systemd-resolved
There are multiple options for setting up a symlink to work with systemd-resolved.

Two main features are supported:


 * Stub resolver: the nameserver is pointed at systemd-resolved, listening on 127.0.0.53. DNS queries are executed by systemd-resolved.
 * Search path: The "search" directive is used to configure default domain names to be used when resolving single-word DNS queries.

The available options/features depend on the version of systemd installed and which target is used for the symlink.

openresolv
The package integrates with several other packages to dynamically update  when network configuration changes occur. When using openresolv, should be a regular file.

External resource

 * https://wiki.archlinux.org/index.php/Resolv.conf