概要
Docker公式ツールである Machine を使って同じく公式ツールである Swarm のクラスタを作るという話。
Machine を使って Swarm クラスタを構築する
クラスタトークンの作成
swarmコンテナを走らせてトークンを発行するために、まず一時的にDockerホストを立てる
$ docker-machine create -d virtualbox local
INFO[0001] Creating SSH key...
INFO[0001] Creating VirtualBox VM...
INFO[0009] Starting VirtualBox VM...
INFO[0009] Waiting for VM to start...
INFO[0042] "local" has been created and is now the active machine.
INFO[0042] To point your Docker client at it, run this in your shell: $(docker-machine env local)
$ $(docker-machine env local)
$ docker run swarm create
Unable to find image 'swarm:latest' locally
511136ea3c5a: Pull complete
ae115241d78a: Pull complete
f49087514537: Pull complete
fff73787bd9f: Pull complete
97c8f6e912d7: Pull complete
33f9d1e808cf: Pull complete
62860d7acc87: Pull complete
bf8b6923851d: Pull complete
swarm:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Status: Downloaded newer image for swarm:latest
b9d430858ebdb9b079eba25664b1399b
トークン b9d430858ebdb9b079eba25664b1399b を手に入れる。
local というマシンは捨ててしまおう
$ docker-machine rm local
Swarm Master の 構築
$ docker-machine create \
-d virtualbox \
--swarm \
--swarm-master \
--swarm-discovery token://b9d430858ebdb9b079eba25664b1399b \
swarm-master
INFO[0000] Creating SSH key...
INFO[0001] Creating VirtualBox VM...
INFO[0009] Starting VirtualBox VM...
INFO[0009] Waiting for VM to start...
INFO[0042] Configuring Swarm...
INFO[0062] "swarm-master" has been created and is now the active machine.
INFO[0062] To point your Docker client at it, run this in your shell: $(docker-machine env swarm-master)
Swarm Node の構築
3 台 Swarm Node を作る
$ docker-machine create \
-d virtualbox \
--swarm \
--swarm-discovery token://b9d430858ebdb9b079eba25664b1399b \
swarm-node-00
INFO[0001] Creating SSH key...
INFO[0001] Creating VirtualBox VM...
INFO[0009] Starting VirtualBox VM...
INFO[0009] Waiting for VM to start...
INFO[0042] Configuring Swarm...
INFO[0052] "swarm-node-00" has been created and is now the active machine.
INFO[0052] To point your Docker client at it, run this in your shell: $(docker-machine env swarm-node-00)
$ docker-machine create \
-d virtualbox \
--swarm \
--swarm-discovery token://b9d430858ebdb9b079eba25664b1399b \
swarm-node-01
INFO[0000] Creating SSH key...
INFO[0001] Creating VirtualBox VM...
INFO[0009] Starting VirtualBox VM...
INFO[0009] Waiting for VM to start...
INFO[0042] Configuring Swarm...
INFO[0059] "swarm-node-01" has been created and is now the active machine.
INFO[0059] To point your Docker client at it, run this in your shell: $(docker-machine env swarm-node-01)
$ docker-machine create \
-d virtualbox \
--swarm \
--swarm-discovery token://b9d430858ebdb9b079eba25664b1399b \
swarm-node-02
INFO[0000] Creating SSH key...
INFO[0001] Creating VirtualBox VM...
INFO[0009] Starting VirtualBox VM...
INFO[0010] Waiting for VM to start...
INFO[0043] Configuring Swarm...
INFO[0053] "swarm-node-02" has been created and is now the active machine.
INFO[0053] To point your Docker client at it, run this in your shell: $(docker-machine env swarm-node-02)
マシンリストを見てみる
$ docker-machine ls
NAME ACTIVE DRIVER STATE URL SWARM
swarm-master virtualbox Running tcp://192.168.99.100:2376 swarm-master (master)
swarm-node-00 virtualbox Running tcp://192.168.99.102:2376 swarm-master
swarm-node-01 virtualbox Running tcp://192.168.99.103:2376 swarm-master
swarm-node-02 * virtualbox Running tcp://192.168.99.104:2376 swarm-master
Swarm の利用
$(docker-machine env --swarm swarm-master)
$ docker info
Containers: 5
Nodes: 4
swarm-node-00: 192.168.99.102:2376
└ Containers: 1
└ Reserved CPUs: 0 / 4
└ Reserved Memory: 0 B / 999.9 MiB
swarm-node-01: 192.168.99.103:2376
└ Containers: 1
└ Reserved CPUs: 0 / 4
└ Reserved Memory: 0 B / 999.9 MiB
swarm-node-02: 192.168.99.104:2376
└ Containers: 1
└ Reserved CPUs: 0 / 4
└ Reserved Memory: 0 B / 999.9 MiB
swarm-master: 192.168.99.100:2376
└ Containers: 2
└ Reserved CPUs: 0 / 4
└ Reserved Memory: 0 B / 999.9 MiB