docker v1.12のオーケストレーション機能をマルチホストで試すよ on さくらのクラウド ref: http://qiita.com/yamamoto-febc/items/afc7143e609c170140e6

_swarm_init実行

# 1台目のマシンに接続
$ eval $(docker-machine env sakura01)

# init実施
$ docker swarm init 
Swarm initialized: current node (bvotc0o2ukxbeud6jedhpyvsq) is now a manager.

IP確認

$ docker-machine ip sakura01

serviceコマンド

$ docker service --help

Usage:  docker service COMMAND

Manage Docker services

Options:
      --help   Print usage

Commands:
  create      Create a new service
  inspect     Inspect a service
  tasks       List the tasks of a service
  ls          List services
  rm          Remove a service
  scale       Scale one or multiple services
  update      Update a service

Run 'docker service COMMAND --help' for more information on a command.

service実行

$ docker service create --replicas 1 --name hellosakura -p 80:80 nginx:latest

swarm_init

$ docker swarm init --help

Usage:  docker swarm init [OPTIONS]

Initialize a Swarm

Options:
      --auto-accept value   Auto acceptance policy (worker, manager, or none)
      --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)
      --secret string       Set secret value needed to accept nodes into cluster

swarm_init確認

$ docker node ls
ID                           NAME      MEMBERSHIP  STATUS  AVAILABILITY  MANAGER STATUS
bvotc0o2ukxbeud6jedhpyvsq *  sakura01  Accepted    Ready   Active        Leader

swarm_join

$ docker swarm join --help

Usage:  docker swarm join [OPTIONS] HOST:PORT

Join a Swarm as a node and/or manager

Options:
      --ca-hash string      Hash of the Root Certificate Authority certificate used for trusted join
      --help                Print usage
      --listen-addr value   Listen address (default 0.0.0.0:2377)
      --manager             Try joining as a manager.
      --secret string       Secret for node acceptance

swarm_join実施

# 2台目のマシンへ接続
$ eval $(docker-machine env sakura02)

# join
$ docker swarm join `docker-machine ip sakura01`:2377
This node joined a Swarm as a worker.

# 3台目のマシンへ接続
$ eval $(docker-machine env sakura03)

# join
$ docker swarm join `docker-machine ip sakura01`:2377
This node joined a Swarm as a worker.

# 1台目に接続して確認
$ eval $(docker-machine env sakura01)
$ docker node ls
ID                           NAME      MEMBERSHIP  STATUS  AVAILABILITY  MANAGER STATUS
03qup39ksvhcgvusqk7o9x50h    sakura03  Accepted    Ready   Active        
bvotc0o2ukxbeud6jedhpyvsq *  sakura01  Accepted    Ready   Active        Leader
ccup7i31v4dbzip15ej49wpzm    sakura02  Accepted    Ready   Active        

マシン作成

# 1台目
$ docker-machine create -d sakuracloud \
    --sakuracloud-access-token=[ACCESS TOKEN] \
    --sakuracloud-access-token-secret=[ACCESS TOKEN SECRET] \
    --engine-install-url="https://experimental.docker.com" \
    sakura01

# 2台目
$ docker-machine create -d sakuracloud \
    --sakuracloud-access-token=[ACCESS TOKEN] \
    --sakuracloud-access-token-secret=[ACCESS TOKEN SECRET] \
    --engine-install-url="https://experimental.docker.com" \
    sakura02

# 3台目
$ docker-machine create -d sakuracloud \
    --sakuracloud-access-token=[ACCESS TOKEN] \
    --sakuracloud-access-token-secret=[ACCESS TOKEN SECRET] \
    --engine-install-url="https://experimental.docker.com" \
    sakura03

動作確認

$ open http://`docker-machine ip sakura01`
$ open http://`docker-machine ip sakura02`
$ open http://`docker-machine ip sakura03`

確認

# サービス起動状況の確認
$ docker service ls
ID            NAME         REPLICAS  IMAGE         COMMAND
2685cua3k8wm  hellosakura  1/1       nginx:latest  

# サービス内の各タスクの起動状況の確認(sakura03で起動しているのが見える)
$ docker service tasks hellosakura
ID                         NAME           SERVICE      IMAGE         LAST STATE          DESIRED STATE  NODE
4zh6ppxmxncfm6guswtoixmho  hellosakura.1  hellosakura  nginx:latest  Running 37 seconds  Running        sakura03