The document discusses how to fully master Ansible. It provides an overview of what Ansible is and how it works, explaining that it is an automation tool that can be used to configure, deploy, and manage infrastructure and applications. It then provides instructions on how to install and use basic Ansible functionality like playbooks and tasks to automate systems administration. Finally, it shows a more complex example of using Ansible to implement FizzBuzz to demonstrate increased proficiency with the tool.

1. Ansibleを完全にマスターする
Keisuke.K

2. Ansible #とは

3. http://www.ansible.com/how-ansible-works
Ansible is a radically simple IT automation engine that automates cloud
provisioning, configuration management, application deployment, intra-
service orchestration, and many other IT needs.
Being designed for multi-tier deployments since day one, Ansible models
your IT infrastructure by describing how all of your systems inter-relate,
rather than just managing one system at a time.
It uses no agents and no additional custom security infrastructure, so it's
easy to deploy - and most importantly, it uses a very simple language (YAML,
in the form of Ansible Playbooks) that allow you to describe your
automation jobs in a way that approaches plain English.
On this page, we'll give you a really quick overview so you can see things in
context. For more detail, hop over to docs.ansible.com.

4. Infrastructure as a Code を実現する
要するに

5. Ansible の導入
まずは

6. • RHEL 6, 7 (EPEL)
– # yum install ansible
• Fedora ～21
– # yum install ansible
• Fedora 22～
– # dnf install ansible

7. ＿人人人人＿
＞ 簡単 ＜
￣Y^Y^Y^Y￣

8. Ansible の使い方

9. Playbook を書く
$ cat site.yml
- hosts: webservers
tasks:
- name: Install httpd
yum: name=httpd state=installed
- name: Start httpd
service: name=httpd state=started

10. 適用先ホストを書く
$ cat hosts
[webservers]
www.example.com

11. Playbook を実行する
$ ansible-playbook –i hosts site.yml

12. ＿人人人人＿
＞ 簡単 ＜
￣Y^Y^Y^Y￣

13. もちろん
• 何度繰り返しても同様の結果になります
• 冪等性
• Playbook にはあるべき状態を記述すると
いう意識で

14. 補足
• エージェントレス
• Python さえ入ってれば OK
• ノーパスフレーズ鍵または ssh-agent に鍵
を登録すると幸せになれる

15. ちょっと複雑なこともやってみる

16. 要件
• httpd を入れて起動する
• httpd の自動起動を有効化する
• Listen ポートを変える
• 設定を変えて ansible-playbook したとき
は httpd を再起動する

17. site.yml
- hosts: webservers
tasks:
- name: Install httpd
yum: name=httpd state=installed
- name: Change listen port
lineinfile:
dest=/etc/httpd/conf/httpd.conf
regexp=”^Listen ” line=”Listen 10080”
notify: Restart httpd
- name: Start httpd
service: name=httpd enabled=yes state=started
handlers:
- name: Restart httpd
service: name=httpd state=restarted

18. ＿人人人人＿
＞ 簡単 ＜
￣Y^Y^Y^Y￣

19. Ansible を完全にマスターする
本題

20. 完全にマスターする #とは
で、

21. https://twitter.com/kamekoopa/status/641840765904154624

22. Ansible 完マス
• Hello, World?
• /etc/motd に “Hello, world!” 書くくらい
では簡単にできてしまう。
• FizzBuzz?
• 冪等性 #とは
• やろう

23. FizzBuzz /w Ansible
- hosts: 127.0.0.1
connection: local
tasks:
- file: path=/tmp/fizzbuzz_counter state=touch
- shell: echo $((`cat /tmp/fizzbuzz_counter` + 1)) >
/tmp/fizzbuzz_counter
- set_fact: counter="{{lookup('file', '/tmp/fizzbuzz_counter')}}"
- debug: msg=FizzBuzz
when: "{{counter|int % 3}} == 0 and {{counter|int}} % 5 == 0"
register: rc
- debug: msg=Fizz
when: "{{counter|int % 3}} == 0 and rc.skipped is defined"
- debug: msg=Buzz
when: "{{counter|int % 5}} == 0 and rc.skipped is defined"

24. FizzBuzz /w Ansible
$ ansible-playbook fizzbuzz.yml
PLAY [127.0.0.1] **************************************************************
GATHERING FACTS ***************************************************************
ok: [127.0.0.1]
TASK: [file path=/tmp/fizzbuzz_counter state=touch] ***************************
changed: [127.0.0.1]
TASK: [shell echo $((`cat /tmp/fizzbuzz_counter` + 1)) > /tmp/fizzbuzz_counter] ***
changed: [127.0.0.1]
TASK: [set_fact counter="3"] **************************************************
ok: [127.0.0.1]
TASK: [debug msg=FizzBuzz] ****************************************************
skipping: [127.0.0.1]
TASK: [debug msg=Fizz] ********************************************************
ok: [127.0.0.1] => {
"msg": "Fizz"
}
TASK: [debug msg=Buzz] ********************************************************
skipping: [127.0.0.1]
PLAY RECAP ********************************************************************
127.0.0.1 : ok=5 changed=2 unreachable=0 failed=0

25. FizzBuzz /w Ansible
$ ansible-playbook fizzbuzz.yml
PLAY [127.0.0.1] **************************************************************
GATHERING FACTS ***************************************************************
ok: [127.0.0.1]
TASK: [file path=/tmp/fizzbuzz_counter state=touch] ***************************
changed: [127.0.0.1]
TASK: [shell echo $((`cat /tmp/fizzbuzz_counter` + 1)) > /tmp/fizzbuzz_counter] ***
changed: [127.0.0.1]
TASK: [set_fact counter="5"] **************************************************
ok: [127.0.0.1]
TASK: [debug msg=FizzBuzz] ****************************************************
skipping: [127.0.0.1]
TASK: [debug msg=Fizz] ********************************************************
skipping: [127.0.0.1]
TASK: [debug msg=Buzz] ********************************************************
ok: [127.0.0.1] => {
"msg": "Buzz"
}
PLAY RECAP ********************************************************************
127.0.0.1 : ok=5 changed=2 unreachable=0 failed=0

26. FizzBuzz /w Ansible
$ ansible-playbook fizzbuzz.yml
PLAY [127.0.0.1] **************************************************************
GATHERING FACTS ***************************************************************
ok: [127.0.0.1]
TASK: [file path=/tmp/fizzbuzz_counter state=touch] ***************************
changed: [127.0.0.1]
TASK: [shell echo $((`cat /tmp/fizzbuzz_counter` + 1)) > /tmp/fizzbuzz_counter] ***
changed: [127.0.0.1]
TASK: [set_fact counter="15"] *************************************************
ok: [127.0.0.1]
TASK: [debug msg=FizzBuzz] ****************************************************
ok: [127.0.0.1] => {
"msg": "FizzBuzz"
}
TASK: [debug msg=Fizz] ********************************************************
skipping: [127.0.0.1]
TASK: [debug msg=Buzz] ********************************************************
skipping: [127.0.0.1]
PLAY RECAP ********************************************************************
127.0.0.1 : ok=5 changed=2 unreachable=0 failed=0

27. Ansible 完全にマスターした

28. おしまい