久々にCoreOSを触ったらハマった点

• CoreOS用cloud-config.ymlメモ2 - Qiita

dockerが自動起動しなかった

• Docker daemon doesn't start on boot on CoreOS - Server Fault

sudo systemctl enable docker

手動でcloud-config.ymlを変更したい場合

# 書式チェック
coreos-cloudinit -validate=true -from-file=./cloud-config.yml
# 再起動せずに反映
coreos-cloudinit --from-file ./cloud-config.yml
# 再起動後も有効
sudo cp cloud-config.yml /var/lib/coreos-install/user_data
reboot

lsの文字化け対応

write_files:
  - path: /etc/environment
    permissions: 0755
    content: |
        LANG=C.utf8
        LC_CTYPE=C.utf8
        LC_ALL=C.utf8

• LC_CTYPE : lsのエンコード

DHCP無効

clod-config.yml

coreos:
  units:

    - name: systemd-networkd.service
      command: restart

write_files:
  - path: /etc/systemd/network/10-static.network
    permissions: 0644
    content: |
      [Match]
      Name=eth0
      [Network]
      DHCP=none
      Address=172.16.2.2/24
      Gateway=172.16.2.1
      DNS=8.8.8.8
      DNS=8.8.4.4

タイムゾーン

clod-config.yml

coreos:
  units:

    - name: timezone.service
      command: start
      content: |
        [Unit]
        Description=timezone
        [Service]
        Type=oneshot
        RemainAfterExit=yes
        ExecStart=/usr/bin/ln -sf ../usr/share/zoneinfo/Japan /etc/localtime