gistfile1.txt

$ docker-machine create -d virtualbox local
$ eval "$(docker-machine env local)"
$ docker run swarm create
..
357150828546349cb76f0b0b21af2f1a

$ docker-machine create \
    -d virtualbox \
    --swarm \
    --swarm-master \
    --swarm-discovery token:357150828546349cb76f0b0b21af2f1a \
    swarm-master
    
$ docker-machine create \
    -d virtualbox \
    --swarm \
    --swarm-discovery token:357150828546349cb76f0b0b21af2f1a \
    swarm-agent-00
    
$ docker-machine create \
    -d virtualbox \
    --swarm \
    --swarm-discovery token:357150828546349cb76f0b0b21af2f1a \
    swarm-agent-01

$ eval "$(docker-machine env swarm-master)"

# Note below that the agents list their master in the SWARM column.

$ docker-machine ls
NAME             ACTIVE   DRIVER         STATE     URL                         SWARM
dev                       virtualbox     Running   tcp://192.168.99.117:2376
local                     virtualbox     Running   tcp://192.168.99.113:2376
staging                   digitalocean   Running   tcp://45.55.81.106:2376
swarm-agent-00            virtualbox     Running   tcp://192.168.99.115:2376   swarm-master
swarm-agent-01            virtualbox     Running   tcp://192.168.99.116:2376   swarm-master
swarm-master     *        virtualbox     Running   tcp://192.168.99.114:2376   swarm-master (master)

# Below command now gives me info about the swarm-master host

$ docker info
Containers: 2
Images: 7
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 11
 Dirperm1 Supported: true
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 4.0.5-boot2docker
Operating System: Boot2Docker 1.7.0 (TCL 6.3); master : 7960f90 - Thu Jun 18 18:31:45 UTC 2015
CPUs: 1
Total Memory: 996.2 MiB
Name: swarm-master
ID: KL26:LSZU:EOGI:F5GT:TBQU:VMWB:IUJK:JLBM:4PTS:NLSL:SVWE:IXOL
Debug mode (server): true
File Descriptors: 20
Goroutines: 33
System Time: 2015-07-02T22:19:37.494932878Z
EventsListeners: 0
Init SHA1:
Init Path: /usr/local/bin/docker
Docker Root Dir: /mnt/sda1/var/lib/docker
Labels:
 provider=virtualbox

$ eval "$(docker-machine env --swarm swarm-master)"

# Because I added --swarm option, below I get the swarm data... But no nodes listed. Why?

$ docker-machine ls
NAME             ACTIVE   DRIVER         STATE     URL                         SWARM
dev                       virtualbox     Running   tcp://192.168.99.117:2376
local                     virtualbox     Running   tcp://192.168.99.113:2376
staging                   digitalocean   Running   tcp://45.55.81.106:2376
swarm-agent-00            virtualbox     Running   tcp://192.168.99.115:2376   swarm-master
swarm-agent-01            virtualbox     Running   tcp://192.168.99.116:2376   swarm-master
swarm-master              virtualbox     Running   tcp://192.168.99.114:2376   swarm-master (master)


$ docker info
Containers: 0
Images: 0
Role: primary
Strategy: spread
Filters: affinity, health, constraint, port, dependency
Nodes: 0
CPUs: 0
Total Memory: 0 B