2014年09月06日（土）に行われた第4回 コンテナ型仮想化の情報交換会＠東京の発表資料。

15. [Unit]
Description=busybox
Requires=docker.service
After=docker.service
[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill busybox
ExecStartPre=-/usr/bin/docker rm busybox
ExecStartPre=/usr/bin/docker pull busybox
ExecStart=/usr/bin/docker run --name busybox busybox /bin/sh -c "while
true; do echo Hello World; sleep 1; done"
ExecStop=/usr/bin/docker stop busybox
[X-Fleet]
X-Conflicts=busybox@*.service

23. coreos:
etcd:
discovery: https://discovery.etcd.io/<token>
addr: $private_ipv4:4001
peer-addr: $private_ipv4:7001
units:
- name: etcd.service
command: start
- name: fleet.service
command: start
ssh_authorized_keys:
- ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC0g+ZTxC7weoIJLUaf
Ogrm+h...
write_files:
- path: /etc/motd
permissions: 0644
owner: root
content: |
Good news, everyone!

25. #cloud-config
coreos:
update:
reboot-strategy: best-effort
etcd:
# generate a new token for each unique cluster from https://discover
y.etcd.io/new
discovery: https://discovery.etcd.io/<token>
addr: $private_ipv4:4001
peer-addr: $private_ipv4:7001
units:
- name: etcd.service
command: start
- name: fleet.service
command: start

26. write_files:
- path: /tmp/busybox@.service
content: |
[Unit]
Description=busybox
Requires=docker.service
After=docker.service
[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill busybox-%i
ExecStartPre=-/usr/bin/docker rm busybox-%i
ExecStartPre=/usr/bin/docker pull busybox
ExecStart=/usr/bin/docker run --name busybox-%i busybox /bin/sh -
c "while true; do echo Hello World; sleep 1; done"
ExecStop=/usr/bin/docker stop busybox-%i
[X-Fleet]
X-Conflicts=busybox@*.service

27. # 必要に応じて
gcloud config set project <project_id>
gcloud config set compute/zone asia-east1-a
gcloud config set compute/region asia-east1
# 3つのインスタンスを起動
gcloud compute instances create core1 core2 core3 --image coreos
--machine-type f1-micro --metadata-from-file user-data=cloud-config.ya
ml

28. # ログイン
gcloud compute ssh core1
# サービスの登録と起動
fleetctl submit /tmp/busybox@.service
fleetctl start busybox@{1,2}.service
fleetctl list-units

29. # unitに割り当てのあるインスタンスを削除してみる
gcloud compute instances delete core2
gcloud compute ssh core1
# フェイルオーバーが行われることを確認
fleetctl list-units
UNIT DSTATE STATE MACHINE ACTIVE
busybox@.service inactive inactive - -
busybox@1.service launched launched ffc81480.../10.xxx.xxx.237 active
busybox@2.service launched launched 99f741a8.../10.xxx.xxx.150 active
UNIT DSTATE STATE MACHINE ACTIVE
busybox@.service inactive inactive - -
busybox@1.service launched launched ffc81480.../10.xxx.xxx.237 active
busybox@2.service launched launched 27c76d9a.../10.xxx.xxx.221 activa
ting