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Split advertised address from listen address

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There are currently problems with "swarm init" and "swarm join" when an
explicit --listen-addr flag is not provided. swarmkit defaults to
finding the IP address associated with the default route, and in cloud
setups this is often the wrong choice.

Introduce a notion of "advertised address", with the client flag
--advertise-addr, and the daemon flag --swarm-default-advertise-addr to
provide a default. The default listening address is now 0.0.0.0, but a
valid advertised address must be detected or specified.

If no explicit advertised address is specified, error out if there is
more than one usable candidate IP address on the system. This requires a
user to explicitly choose instead of letting swarmkit make the wrong
choice. For the purposes of this autodetection, we ignore certain
interfaces that are unlikely to be relevant (currently docker*).

The user is also required to choose a listen address on swarm init if
they specify an explicit advertise address that is a hostname or an IP
address that's not local to the system. This is a requirement for
overlay networking.

Also support specifying interface names to --listen-addr,
--advertise-addr, and the daemon flag --swarm-default-advertise-addr.
This will fail if the interface has multiple IP addresses (unless it has
a single IPv4 address and a single IPv6 address - then we resolve the
tie in favor of IPv4).

This change also exposes the node's externally-reachable address in
docker info, as requested by #24017.

Make corresponding API and CLI docs changes.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
(cherry picked from commit a0ccd0d42f)
Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Aaron Lehmann
2016-06-30 18:07:35 -07:00
committed by Tibor Vass
parent 38beb3d9ab
commit 762a73bf7f
20 changed files with 792 additions and 69 deletions
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7
docs/reference/api/docker_remote_api_v1.24.md
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@@ -3615,8 +3615,11 @@ Initialize a new Swarm
JSON Parameters:
- **ListenAddr** – Listen address used for inter-manager communication, as well as determining.
the networking interface used for the VXLAN Tunnel Endpoint (VTEP).
- **ListenAddr** – Listen address used for inter-manager communication, as well as determining
the networking interface used for the VXLAN Tunnel Endpoint (VTEP). This can either be an
address/port combination in the form `192.168.1.1:4567`, or an interface followed by a port
number, like `eth0:4567`. If the port number is omitted, the default swarm listening port is
used.
- **ForceNewCluster** – Force creating a new Swarm even if already part of one.
- **Spec** – Configuration settings of the new Swarm.
- **Orchestration** – Configuration settings for the orchestration aspects of the Swarm.