Tomofumi Hayashi 9604565b22 Add -hostprefix in DHCP daemon to run the daemon as container

This diff adds -hostprefix option in dhcp daemon. This option
could be used to run dhcp daemon as container because container
cannot touch host's netns directly. The diff changes dhcp daemon
to touch procfs mounted to another path, like '/hostfs/proc'.

2018-01-25 02:00:43 +09:00

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dhcp plugin

Overview

With dhcp plugin the containers can get an IP allocated by a DHCP server already running on your network. This can be especially useful with plugin types such as macvlan. Because a DHCP lease must be periodically renewed for the duration of container lifetime, a separate daemon is required to be running. The same plugin binary can also be run in the daemon mode.

Operation

To use the dhcp IPAM plugin, first launch the dhcp daemon:

# Make sure the unix socket has been removed
$ rm -f /run/cni/dhcp.sock
$ ./dhcp daemon

If given -pidfile <path> arguments after 'daemon', the dhcp plugin will write its PID to the given file. If given -hostprefix <prefix> arguments after 'daemon', the dhcp plugin will use this prefix for netns as <prefix>/<original netns>. It could be used in case of running dhcp daemon as container.

Alternatively, you can use systemd socket activation protocol. Be sure that the .socket file uses /run/cni/dhcp.sock as the socket path.

With the daemon running, containers using the dhcp plugin can be launched.

Example configuration

{
	"ipam": {
		"type": "dhcp",
	}
}

## Network configuration reference

* `type` (string, required): "dhcp"

1.2 KiB Raw Blame History

dhcp plugin

Overview

Operation

Example configuration

1.2 KiB

Raw Blame History