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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>
This commit is contained in:
Aaron Lehmann 2016-06-30 18:07:35 -07:00
parent 24d2d53f5d
commit a0ccd0d42f
20 changed files with 594 additions and 71 deletions
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29
docs/reference/commandline/swarm_init.md
View file

@ -17,12 +17,13 @@ Usage: docker swarm init [OPTIONS]
Initialize a swarm
Options:
--advertise-addr value Advertised address (format: <ip|hostname|interface>[:port])
--cert-expiry duration Validity period for node certificates (default 2160h0m0s)
--dispatcher-heartbeat duration Dispatcher heartbeat period (default 5s)
--external-ca value Specifications of one or more certificate signing endpoints
--force-new-cluster Force create a new cluster from current state.
--help Print usage
--listen-addr value Listen address (default 0.0.0.0:2377)
--listen-addr value Listen address (format: <ip|hostname|interface>[:port])
--task-history-limit int Task history retention limit (default 5)
```
@ -31,7 +32,7 @@ in the newly created one node swarm cluster.
```bash
$ docker swarm init --listen-addr 192.168.99.121:2377
$ docker swarm init --advertise-addr 192.168.99.121
Swarm initialized: current node (bvz81updecsj6wjz393c09vti) is now a manager.
To add a worker to this swarm, run the following command:
@ -70,11 +71,31 @@ The URL specifies the endpoint where signing requests should be submitted.
### `--force-new-cluster`
This flag forces an existing node that was part of a quorum that was lost to restart as a single node Manager without losing its data
This flag forces an existing node that was part of a quorum that was lost to restart as a single node Manager without losing its data.
### `--listen-addr value`
The node listens for inbound swarm manager traffic on this IP:PORT
The node listens for inbound Swarm manager traffic on this address. The default is to listen on
0.0.0.0:2377. It is also possible to specify a network interface to listen on that interface's
address; for example `--listen-addr eth0:2377`.
Specifying a port is optional. If the value is a bare IP address, hostname, or interface
name, the default port 2377 will be used.
### `--advertise-addr value`
This flag specifies the address that will be advertised to other members of the
swarm for API access and overlay networking. If unspecified, Docker will check
if the system has a single IP address, and use that IP address with with the
listening port (see `--listen-addr`). If the system has multiple IP addresses,
`--advertise-addr` must be specified so that the correct address is chosen for
inter-manager communication and overlay networking.
It is also possible to specify a network interface to advertise that interface's address;
for example `--advertise-addr eth0:2377`.
Specifying a port is optional. If the value is a bare IP address, hostname, or interface
name, the default port 2377 will be used.
### `--task-history-limit`