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自动化运维 --Ansible

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讲师：Breeze Yan自动化运维 QQ群： 22346584 

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课程目录Course Contents

一、 Ansible简介与 Hosts Inventory二、 Ansible常用模块三、 Ansible Playbook简单介绍四、 Playbook的角色及包含五、 Playbook常用模块六、 Playbook的变量七、 Playbook的条件判断八、 Playbook的循环九、自定义模块十、 Ansible生产案例

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Ansible Variables

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Variables Defined in Inventory

Variables Defined in a Playbook

Variables Defined in Commandline

Registered Variables

Variables defined from included files and roles

Using Variables: About Jinja2

Facts

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Variables Defined in Inventory

[webservers]app1_server http_port=80

[webservers:vars]some_server=foo.southeast.example.comhalon_system_timeout=30self_destruct_countdown=60escape_pods=2/etc/ansible/host_vars/app1_server/etc/ansible/group_vars/webservers

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Variables Defined in a Playbook

vars

vars_files

vars_prompt

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Variables Defined in a Commandline

- hosts: mfs_node user: "{{ uservar }}" tasks: - shell: echo "{{ echovar }}"

ansible-playbook command_vars.yml -e 'uservar="root" echovar="hello world"'ansible-playbook command_vars.yml -e '{"uservar":"root", "echovar":"hello world"}'ansible-playbook command_vars.yml -e '@test.json'

cat test.jsonuservar: rootechovar: hello world

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Registered Variables

- hosts: mfs_node tasks: - shell: echo "5" register: result ignore_errors: True

- debug: msg="it failed" when: result|failed

- debug: msg="{{result.stdout}}"

- shell: /usr/bin/bar when: result.rc == 5

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roles

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Using Variables: About Jinja2

template: src=foo.cfg.j2 dest={{ remote_install_path }}/foo.cfg

{{ some_variable | default(5) }}

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Facts

system facts

local facts

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System Facts

ansible <hostname> -m setup

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Local Facts

- hosts: webservers tasks: - name: create directory for ansible custom facts file: state=directory recurse=yes path=/etc/ansible/facts.d - name: install custom impi fact copy: src=ipmi.fact dest=/etc/ansible/facts.d - name: re-read facts after adding custom fact setup: filter=ansible_local

cat ipmi.fact[general]asdf=1bar=2

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Registered Variables

- hosts: web_servers tasks: - shell: /usr/bin/foo register: foo_result ignore_errors: True

- shell: /usr/bin/bar when: foo_result.rc == 5

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Omitting Undefined Variables

- name: touch files with an optional mode file: dest={{item.path}} state=touch mode={{item.mode|default(omit)}} with_items: - path: /tmp/foo - path: /tmp/bar - path: /tmp/baz mode: "0444"

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A YAML Gotcha

#This won’t work:

- hosts: app_servers vars: app_path: {{ base_path }}/22

#Do it like this and you’ll be fine:

- hosts: app_servers vars: app_path: "{{ base_path }}/22"

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Thank You !

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