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複数の公開鍵を一括でサーバに登録

Last updated at Posted at 2015-07-07

誰かがやってそうな話だけど、メモとして残しておこう

やりたかったこと

  1. リモートログイン可能なユーザの公開鍵を管理して、ansible で各サーバに配布する

利用したもの

  • 公開鍵を登録するには authorized_key を利用する
  • authorzied_key.key には lookup を利用してパスを渡すの簡単( Examples を参考に)
  • 公開鍵のパスは with_fileglob: <path> でマッチしたものをそれぞれ渡す

作ったもの

roles/authorized_key/main.yml
---
# file: roles/authorized_key/main.yml

- name: REMOVE  | public keys from all hosts
  authorized_key: 
    user: "{{ target }}"
    key: "{{ lookup('file', item) }}"
    state: absent
  sudo: yes 
  with_fileglob: "{{ publickeys }}/removed/*.pub"

- name: APPEND  | public keys into all hosts
  authorized_key: 
    user: "{{ target }}"
    key: "{{ lookup('file', item) }}"
    state: present
  sudo: yes 
  with_fileglob: "{{ publickeys }}/*.pub"

各サーバの testusr の公開鍵を集約して、それを一括で登録する例

playbooks/update_authorized_keys.yml

- name: SETUP | public keys for testusr
  hosts: all
  user: root
  roles:
    - role: authorized_key
      target: testusr
      publickeys: ~/.ssh/public_keys/testusr
  pre_tasks:
    - name: FETCH | public keys from all hosts
      fetch:
        src: "/home/testusr/.ssh/id_rsa.pub"
        dest: "~/.ssh/public_keys/testusr/{{ ansible_hostname }}.pub"
        fail_on_missing: yes 
        flat: yes

playbook 実行後の authorized_keys

$ tree .ssh
.ssh
├── id_rsa
├── id_rsa.pub
├── known_hosts
└── public_keys
    └── testusr
        ├── hostname01.pub
        ├── hostname02.pub
        └── hostname03.pub
~/.ssh/authorized_keys
ssh-rsa (略) ansible-generated on hostname01
ssh-rsa (略) ansible-generated on hostname02
ssh-rsa (略) ansible-generated on hostname03
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