resolvconf

a framework for managing multiple DNS configurations

SYNOPSIS

resolvconf -I resolvconf [-m metric] [-p] [-x] -a interface [.protocol] < file resolvconf [-f] -d interface [.protocol] resolvconf [-x] -il pattern resolvconf -u resolvconf --version

DESCRIPTION

resolvconf manages resolv.conf(5) files from multiple sources, such as DHCP and VPN clients. Traditionally, the host runs just one client and that updates /etc/resolv.conf . More modern systems frequently have wired and wireless interfaces and there is no guarantee both are on the same network. With the advent of VPN and other types of networking daemons, many things now contend for the contents of /etc/resolv.conf .

resolvconf solves this by letting the daemon send their resolv.conf(5) file to resolvconf via stdin(4) with the argument -a interface [.protocol] instead of the filesystem. resolvconf then updates /etc/resolv.conf as it thinks best. When a local resolver other than libc is installed, such as dnsmasq(8) or named(8), then resolvconf will supply files that the resolver should be configured to include.

resolvconf assumes it has a job to do. In some situations resolvconf needs to act as a deterrent to writing to /etc/resolv.conf . Where this file cannot be made immutable or you just need to toggle this behaviour, resolvconf can be disabled by adding resolvconf = NO to resolvconf.conf(5).

resolvconf can mark an interfaces resolv.conf as private. This means that the name servers listed in that resolv.conf are only used for queries against the domain/search listed in the same file. This only works when a local resolver other than libc is installed. See resolvconf.conf(5) for how to configure resolvconf to use a local name server and how to remove the private marking.

resolvconf can mark an interfaces resolv.conf as exclusive. Only the latest exclusive interface is used for processing, otherwise all are.

When an interface goes down, it should then call resolvconf with -d interface.* arguments to delete the resolv.conf file(s) for all the protocols on the interface .

Here are some options for the above commands:-

resolvconf has some more commands for general usage:-

resolvconf also has some commands designed to be used by it's subscribers and system startup:-

INTERFACE ORDERING

For resolvconf to work effectively, it has to process the resolv.confs for the interfaces in the correct order. resolvconf first processes interfaces from the interface_order list, then interfaces without a metic and that match the dynamic_order list, then interfaces with a metric in order and finally the rest in the operating systems lexical order. See resolvconf.conf(5) for details on these lists.

PROTOCOLS

Here are some suggested protocol tags to use for each resolv.conf file registered on an interface No :-

IMPLEMENTATION NOTES

If a subscriber has the executable bit then it is executed otherwise it is assumed to be a shell script and sourced into the current environment in a subshell. This is done so that subscribers can remain fast, but are also not limited to the shell language.

Portable subscribers should not use anything outside of /bin and /sbin because /usr and others may not be available when booting. Also, it would be unwise to assume any shell specific features.

ENVIRONMENT

FILES

HISTORY

This implementation of resolvconf is called openresolv and is fully command line compatible with Debian's resolvconf, as written by Thomas Hood.

AUTHORS

Roy Marples <roy@marples.name>

BUGS

Please report them to http://roy.marples.name/projects/openresolv

resolvconf does not validate any of the files given to it.

When running a local resolver other than libc, you will need to configure it to include files that resolvconf will generate. You should consult resolvconf.conf(5) for instructions on how to configure your resolver.

SEE ALSO

resolver(3), stdin(4), resolv.conf(5), resolvconf.conf(5)

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