【Ansible 文档】提示、推荐、注意事项
1. 查看 详细 信息如果你想要查看成功模块和不成功的详细输出，使用 --verbose 标识
2. 检查 playbook 的语法
使用 ansible-playbook 的 --syntax-check 标识。通过parser来运行playbook，确保Include files、roles等没有语法错误。
3. 在运行playbook之前，查看playbook影响的哪些主机
ansible-playbook playbook.yml --list-hosts
4. 运行playbook的方式
ansible-playbook playbook.yml -f 10
5. 特权上升的方式更改为 become
6. 指定主机顺序执行playbook
inventory:
The default. The order is ‘as provided’ by the inventory
reverse_inventory:
As the name implies, this reverses the order ‘as provided’ by the inventory
sorted:
Hosts are alphabetically sorted by name
reverse_sorted:
Hosts are sorted by name in reverse alphabetical order
shuffle:
Hosts are randomly ordered each run
7. 任务可以使用历史遗留格式： action: module options 来声明，但是推荐使用 module: options 格式
8. 大多数模块使用 “key=value” 来指定参数，例如服务模块。但是 “command and shell ” 模块使用的是参数列表，不使用“key=value”格式。
tasks: - name: enable selinux
command: /sbin/setenforce 1
command和shell模块关心返回值，因此如果你有的命令退出码不为0，你可能希望这么做：
tasks: - name: run this command and ignore the result
shell: /usr/bin/somecommand || /bin/true
tasks: - name: run this command and ignore the result
shell: /usr/bin/somecommand
ignore_errors: True
9. 如果一行太长了，在下一行使用一个空格缩进表示命令的继续
tasks:- name: Copy ansible inventory file to client copy: src
=/etc/ansible/hosts dest=/etc/ansible/hosts owner
=root group=root mode=0644
10. playbook 可能有四个包含任务的部分
pre_tasks, tasks, post_tasks， roles
11. handlers 需要注意的
handler执行的时机：
[*]handlers notified within pre_tasks, tasks, and post_tasks sections are automatically flushed in the end of section where they were notified;
[*]handlers notified within roles section are automatically flushed in the end of tasks section, but before any tasks handlers.表明 roles 会跟tasks section合并
此外，通过meta，可以提前执行handler：
tasks: - shell: some tasks go here
- meta: flush_handlers
- shell: some other tasks
可以指定监听的主题
handlers: - name: restart memcached
service: name=memcached state=restarted
listen: "restart web services"
- name: restart apache
service: name=apache state=restarted
listen: "restart web services"
tasks:
- name: restart everything
command: echo "this task will restart the web services"
notify: "restart web services"
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